Simple Hard High Speed Door, Aluminum high speed hard door, Aluminum spiral high speed door SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , http://www.hongfahsrud.com
1.1 The purpose and ideas of the reconstruction project The thermal control system for Units #3 and #4 at Douba Power Plant was designed in the early 1960s. The control level was extremely low and the control instrumentation was behind. Although continuous improvement has been made over the years and gradually improved, only some secondary meters and some primary meters of the system have been upgraded. The system structure and layout have not changed, obsolete disk trays, aging of operation switches, disordered meter layout, and cables. And some secondary lines are arranged with irregular insulation aging, power system chaos, etc., poor system security, automatic and imperfect protection, backward operation and operation modes, poor ability to adapt to peak shaving, and difficulty in meeting the needs of the electricity market, compared with those of modern 100 MW units. The development of capacity and automatic control level is very unsuitable. Based on the fact that the old 100MW units cannot be phased out in the near future, in order to meet the requirements of the Ministry of Electric Power for creating first-class thermal power generation enterprises, the current reductions in efficiency, and the reduction of unsatisfactory electricity by bidding online The requirements were adapted to improve the safe operation and automation level of the unit. According to the arrangement of Sichuan Electric Power Company and Yibin Power Generating Plant, during the wet season, thermal control systems for the No. 3 and #4 units (2×100MW) of Douba Power Plant were used. Reformed.
Since the 1980s, the widespread adoption of DCS systems in thermal power plants has greatly promoted the automatic control and safe economic operation of the units. The DCS system has become the main thermal control system for large and medium-sized power plants. Thanks to the successful use of DCS in large and medium-sized units, the application of DCS systems has become more and more common since the 1990s. On the one hand, it can improve the automation level of units and improve the safety, reliability, and economy of unit operations. On the one hand, it can reduce the labor intensity of operating operators.
According to the current situation in the power market, the DCS system principle of the “mid-range and practical†structure should be adopted for the thermal control system of Sichuan Electric Power Co., Ltd., and the requirements for the reliability, safety, economy, and flexibility of control of the unit should be improved. Combining with the specific conditions of Units #3 and #4, this transformation is mainly aimed at the original thermal control system, replacing the existing single-loop control system, measuring instrumentation system, and the operation system of the electric door and milling auxiliary equipment with the DCS system. In addition, the instrument panel table, thermal protection system, cables, etc. were rebuilt, mainly including the master control furnace coordination control system and the steam turbine low-voltage pure electric control system, and the sequential control system, and the instrument panel table and thermal protection system were updated. Transformation. The purpose is to improve the reliability of the unit operation, ensure the stability of the operating parameters, improve the economic efficiency of the unit, and minimize the inconsistency of the operating conditions caused by individual differences in operating personnel. In order to reduce the labor intensity of the operating personnel, it lays the foundation for the machine-and-furnace duty-to-work, specialization and versatility, and reduction of people's efficiency.
1.2 The basic situation of the original thermal control system The thermal control system of No. 3 and # 4 units of the Doiba Power Plant of Yibin Power Plant has been put into operation since the year 76. After continuous improvement over the years, the thermal control system is still lagging behind.
1.2.1 The automatic control system is composed of KMM regulators. The original system is not equipped with a steam turbine low-voltage pure electric control system. The steamer starts deactivating the remote operation or manually operates the synchronizer on site, and cannot be automatically synchronized. The operation is cumbersome during operation, and the operation is inconvenient. The control accuracy is low and the load deviation is about 15MW. When the original unit was handed over to the power plant, there was no coordinated control system for the furnace, and the capacity for peak adjustment was poor. The adjustment system has a complex structure, many intermediate conversion equipments, installation and dispersion, and contact cables switching back and forth. The fault points are numerous and difficult to find, which is not conducive to the safe and economic operation of the unit.
1.2.2 The original display instruments are conventional instruments, and most of them are dynamic surface meters. The accuracy is low and there are many intermediate links, which restricts the improvement of measurement accuracy. Dashboards and consoles are arranged in an arc, obsolete, and repaired many times. Meters and layout are disorderly, which is not conducive to operation monitoring. Most of the operation switches on the table are eliminated equipment, no spare parts are available, the secondary wires and terminals are in disorder, and the reliability is poor.
1.2.3 Thermal protection system Most control loop relays have not been modified. The equipment is aging, poor reliability, dispersive layout, and the secondary lines and power supply are chaotic. Fire protection device MFSS-P type has been used for many years, there are many problems, the protection system is not perfect, such as fire protection without fuel interruption and protection of water level, steam turbine without lubricant protection and fault protection group and other changes. The thermal signal is a DC 220V bulb lighting signal, and DC grounding problems often occur.
1.2.4 The thermal power system is not centralized, and there is no automatic reclosing function. Older power switches are used. The power supply and power supply of meters and meters are mixed with the protection power supply. The cables and some secondary wires are seriously aged and have poor reliability.
1.2.5 Cable layer The cable layout is chaotic, crosswise and crosswise. It does not meet the layering requirements of power cables, control cables, and signal cables. Signal interference is serious, and some cables are seriously aged and have poor reliability.
2. Technical features of the retrofit project The thermal control system for the #3 and #4 units of the Doba Power Plant (2×100MW) was reconstructed. Projects were started, projects were established, and tenders were established for the main equipment manufacturers from the beginning of the year. After on-site inspection and data collection, I/ was conducted. The design of the O point, the layout of the disc table, and the design of the control system were carried out. The demolition, installation, and commissioning began on August 1, 2000. By October 15, 2000, Unit 4 was ignited and connected to the grid to generate electricity. The construction and static commissioning tasks were completed and all commissioning tasks were completed on November 12, 2000. The systems and equipment are currently operating well. The reform of the thermal control system of the #3 and #4 units (2×100MW) at Douba Power Plant has the following outstanding features:
2.1 Doba Power Plant 100MW parent control unit thermal control DCS system transformation to achieve energy balance coordinated control In Sichuan, the same type of unit is the first time.
2.2 Thermal Control DCS System Transformation The DCS system and DEH system integration model was successfully used.
The host and DUP communication mode of 2.3#3 and #4 unit DCS/DEH system adopts a pair of redundant data highway network - real-time data network to realize the transmission of coordinated operation control data for cross-operation, and to communicate at any operator station through online communication. Or the engineer station configures its #3 or #4 unit.
2.4 The ball mill level monitoring system entered the DCS system to achieve automatic control of the milling system for the first time successfully applied on the 100MW master control unit, and achieved control through vibration to the coal.
2.5 The thermal control DCS system of the two units was transformed at the same time. The scale was reasonable, the utility model was medium and practical, and the performance price ratio was reasonable.
2.6 The DCS system has a large volume of renovation projects and excellent project quality. In particular, the cable laying and stripping process is outstanding, and the DCS system works well after being put into operation.
2.7 The system is powered once and successfully. In the whole process of power transmission and debugging, a piece of card or even a component is not burned.
2.8 independently complete the installation of engineering and thermal protection system debugging work.
3. System renovation program and system composition 3.1 Thermal control system reform program Based on the experience of Huangshuangzhuang Power Plant's DCS system renovation, combined with the specific conditions of the 100MW mother plant control, the two furnace hearth (Hhaguo, Kazakhstan steam plant), and the provincial power company The overall requirements for the DCS retrofit of the thermal control system of the 100 MW unit in Douba Power Plant was based on the principles of “practical for mid-range, thorough reform, and avoidance of repeated investmentâ€, and developed the DCS retrofit scheme for thermal control system #3 and #4 for Doba Power Plant. Sub-transformation includes:
1) DCS system transformation, including:
â— Data Acquisition and Processing System (DAS)
â— Analog Control System (MCS)
â— Sequential Control System (SCS)
â— Steam Turbine Low Voltage Pure Electrical System (DEH)
2) Reconstruction of thermal protection system 3) Reconstruction of thermal control panel 4) Modification of rebuilt computer room and control room 5) Transformation of power supply system and microcomputer grounding system 6) Modification of peripheral equipment: including cable transformation, partial actuator modification, and some measurement instruments Transformation and so on.
The transformation of the original # 3, # 4 furnace control to carry out all the demolition transformation, re-platform re-production, re-arranged, build a computer room. The thermal system measures points into the DAS system, the disk table retains the main parameter monitoring instruments, all remote operation and adjustment systems enter the MCS system, important adjustments are reserved for back-up hand exercises, all auxiliary machines (except DC pumps) and electric gates (except drums) The accident discharges water, vents the steam exhaust door, and the solenoid valve enters the SCS system. The turbine is controlled by a low-voltage pure electric control system, which realizes remote parking brakes and automatic grid synchronization. Thermal protection protection control circuit equipment (switches, relays, etc.) are all updated, fire protection is controlled by PLC, protection is not entered into the DCS system, and there is a cut-off switch and operation switch on the operation table, but auxiliary milling machine protection, total boiler interlocking Auxiliary machine interlocks are completed by the SCS system. The thermal control power supply system adopts a dual-circuit automatic reclosing power supply mode, a new microcomputer grounding system and a grounding resistance of less than 2 ohms. Remove all the original cable from the cable tray, reconstruct the cable layer, re-lay the cable according to the layout of the cable tray, enter the analog signal of the DCS system and use the shielded cable through the digital input signal cable of the 3KV cable channel to prevent electromagnetic interference.
The original automatic control system was reconstructed, the flour drying system was changed to an automatic adjustment system, and the coal leveler (noise control) control system was added. In order to achieve coordinated control, an automatic air-supply regulation system was added, and wing air-measuring devices were added.
In thermal protection, fire protection increases fuel cutoff, blower fan all-stop protection, and drum water level protection. Steam turbine main protection increases turbine oil pressure protection, generator and transformer fault protection, and thermal signal adopts packaged LED. With sound and light alarm display.
Due to the limited funds, and according to the specific conditions of the old unit transformation, the oxygen removal water supply system and the electrical system were not included in this transformation.
In order to adapt to the transformed system functions and operational requirements, relevant implementing agencies, transmitters, electric doors, and auxiliary control circuits for milling machines have been transformed accordingly.
The DCS system and the DEH system are integrated. They are all Shanghai Xinhua XDPS-400 systems. Hosts and DPUs of #3 and #4 units use a redundant high-speed data network to implement cross-operation coordinated control data transmission. .
3.2 System Hardware Composition 3.2.1 #3, #4 unit thermal control system constitutes the entire furnace control room is divided into three parts:
In the middle, there are #3 and #4 furnace operation and operation rooms, with a total of 2×4 control panels, including 2×3 boilers and 2×1 steam turbines, with industrial slag TV, fire protection host, and coal control. Wind pressure meter, ammeter, main temperature, pressure, electrical contact water level meter and other important meters; operating table 2 × 3 surface, including boiler 2 × 2 surface, turbine 2 × 1 surface, equipped with a backup communicator, protection cut Investment, safety door operation, powder, fuel, gas power operation, important operation of steam turbine DC oil pump operation, etc.
On the left side, there are #3 furnace relay panels and switchboards. There are a total of 1 thermal control power supply panel, 4 relay protection relay panels, and 3 power distribution panels.
The right side is the #4 furnace relay panel, power distribution panel, a total of 1 main control panel for thermal control, 4 panel relay protection relays, 3 panel distribution panels, and 1 panel for sending and inducing fans.
The rear part is a computer room with a total of 2×7 DCS cabinets and 2 sets of engineer stations.
Relay relay panel 2 side, # 1 fire protection disk, built-in Omron PLC and control relays, etc.; # 2 is a safety door protection disk, built-in DC contactor and powder milling auxiliary protection relay.
Relay relay panel 2, # 1 is the host Phillips (# 3 for the RMS700, # 4 for the MMS6000) protection disk, built-in Philip speed, vibration, axis displacement, differential expansion, deflection plate and control relays, etc. ; # 2 host and auxiliary, extraction exhaust reverse door and other auxiliary protection disk, built-in transformers, control relays and so on.
The switchboard is equipped with a drawer type, built-in furnace electric door control circuit, machine cycle water electric door switch, and the turbine electric door to form a circular power supply, the automatic reclosing circuit supplies power to the thermal main power disk, the actuator, air switch 2 to DCS/DEH System power supply.
3.2.2 DCS/DEH systems for #3 and #4 units are structured as follows:
3.2.2.1 2 and 2 boiler operator stations #3 and #4 and 2×1 turbine operator stations. The operator stations are mutually redundant. The host and long-line driver 2×3 are installed in the computer room #7. In the cabinet; engineer station 2×1; AC 220V automatic switching power supply 2×1.
3.2.2.2 DCS/DEH System Cabinets and Terminal Cabinets of #3 and #4 Units 2×7:
◠#1 cabinet DAS/DEH system DPU: 2×2, AC 220V automatic switching power supply 2×1, DC 5V.15V.-15V power supply 2×1, DC 48V power supply 2×1, DC 24V power supply 2 ×1, the output terminal is in #2 cabinet.
◠#3 cabinet MCS/SCS system DPU: 2×2, AC 220V automatic switching power supply 2×1, DC 5V.15V.-15V power supply 2×1, DC 24V power supply 2×1, the output terminals are #4 cabinet.
â— The number of cards for #1 and #3 cabinets is:
AI card: TC board 2 × 5 blocks;
RTD board 2×3 blocks;
The mA plate is 2 x 12 pieces.
DI card: 2x8 blocks.
AO card: 2x2 blocks.
DO card: 2x16 blocks.
LC card: 2x2 blocks.
LC-S card: 2 x 2 blocks.
VCC card: 2x1 blocks.
MPC card: 2x3 blocks.
MPC-OPC card: 2x3 blocks.
OPC card: 2x1 block.
Station control BC card: 2x11 blocks.
â— The number of terminal boards and RHAs for #2, #4, and #5 cabinets is:
AI/VTB board: 2x12 blocks.
TCTB board: 2x5 blocks.
RTDTB board: 2 x 3 blocks.
DITB board: 2x8 blocks.
AOTB board: 2x1 blocks.
DOTB board: 2 x 18 blocks. (with relay)
LCTB board: 2x2 blocks.
LC-STB plate: 2 x 2 pieces.
VCCTB board: 2×2 blocks.
MPCTB board: 2x1 blocks.
VCC is the servo valve control card, which is the core part of the turbine valve control; LC is the loop control card; LC-S is the servo control card; it has AI, AO, DI, DO input and output functions.
Serve: KE3 2x5 sets.
â—#6 cabinet auxiliary equipment starts and stops importing DC relay 2×60, automatic switching 2×65, isolation transformer 2×1.
◠2 × 2 sets of coal bed material level monitoring devices are installed in # 7 cabinets.
◠UPS power supply (6KVA) 2 × l units.
3.2.2.3 The engineer's console 2 × l, the engineer station is equipped with a host 2 × 1, Taiwan, a laser color printer, inkjet black and white printer l. Operator station 2 x 3, equipped with a ball marker, a dedicated keyboard and 21-inch color display.
3.2.2.4 DAS/DEH systems share one pair of DPUs, and MCS/SCS systems share one pair of DPUs to achieve integration of DCS and DEH.
The parameters that need to be accumulated and compensated are calculated by the system and then displayed on the flow chart or output to the relevant instrument from the AO port.
Operation records and alarm records are completed by the system and are manually selected for printing.
All DI signals can be used as SOE signals, but they must be managed by the same DPU and the same station control BC board in order to reach the millisecond level and be allocated to three time segments, each of which is: 80 points, 32 points, and 16 points.
Important adjustment signals are processed with two, three, or four, and are taken from different cards to improve the reliability of the system when the transmitter fails.
3.2.2.5 The XDPS system consists of three parts: a high-speed data network and an MMI (operator station or engineering station) connected to the Internet. MMI is connected to the DPU through a real-time data network of redundant high-speed data network using a passive main coaxial cable. The DPU achieves dual DPU tracking and arbitration switching through 344 cards, and implements each I/O slave station (XDPS-BC) through BITBUS. Data exchange between. There are 8 DPUs and 8 MMI nodes connected to the DCS/DEH system of #3 and #4 units.
The DPU controls the BC board and the BC board controls the I/O board.
3.2.2.6 Actuator for automatic adjustment The control of the DO card or LC-S card is used in addition to the AO output for the control of the Hadman actuator. The manual operation of the Hadmann actuators uses a switch control. Remote actuators and electric gates are controlled by DO card relays. The control of the auxiliary machine of the boiler adopts the relay output of the DO card to control the electric door after the power amplification relay. The interlocking and protection of the auxiliary system of the milling system, the interlocking of the boilers, and the interlocking of the turbines are completed by the SCS system.
I/O signals and actuator control cables are directly connected to cabinets or relay cabinets in place to reduce intermediate links. The electric door and auxiliary control and signal cables are directly connected to the cabinet or relay cabinet through the intermediate cabinet.
3.2.2.7 A total of seven backup hand exercises are provided: one main water supply regulation system, two pilot wind adjustment systems, two air supply regulation systems, and two secondary temperature adjustment control systems. A total of six backup buttons are configured: four fuel conditioning systems and two large feedwater bypass systems.
3.2.2.8 Redundant automatic reclosing power supply for thermal control system: (The same for #3 and #4 units and below for 1 unit)
Since the bean factory does not have uninterrupted power supply, in order to make the power supply of the thermal control system reliable, without increasing the investment too much, the power supply is taken from different sections of the AC 380V.
â— The power supply section III and IV section AC 380V two-way power supply to the distribution board and automatic reclosing.
â— After the automatic reclosing, C phase and two phases are used to supply power to the thermal power main power disk. The thermal power main power disks respectively supply two pairs of disk power stations.
â— After auto-reclosing, take A-phase two-way power to the actuator.
â— DC 220V power supply all the way to get to # 1 machine on site for # 3 unit thermal control of the total power supply board, the other way to remove the oxygen feed water tray # 4 thermal control of the main power supply, # 3, # 4 units of the DC 220V power supply connected, Constitute a circular power supply.
â— In the switchboard incoming line, two phases of Phase B are used to supply power to the DCS/DEH system and all the way through the UPS. After the DCS/DEH system automatically switches the power switch for operator station, engineer station, and DPU, the two circuits respectively supply redundant DC power supplies (5, 15, 24, and 48 V).
3.2.2.9 The power signal of the generator is provided by a dedicated power transmitter. The speed signal of the turbine is measured by three dedicated probes. Generator power and turbine speed signals are all three options to improve reliability.
3.2.2.10 The DEH standby communicator is installed on the steamer operating table to prepare for the system failure. When the VCC card is normal, the steamer is cut to the manual operation mode.
3.2.2.11 The overall size of the system is as follows: (Units #3 and #4 are the same, the following is the case of one unit)
DCS/DEH Configuration Points DCS/DEH Usage Points DCS/DEH Backup Points AI (mA/V)
AI(TC): 806416
AI(PT100): 32239
AI (Cu50): 16160
MCP/OPC: 660
DI/SOE
AO (mA/V): 25223
DO
Total DCS/DEH usage points: 711 points;
DCS/DEH spare points: 225 points;
DCS/DEH standby rate: 225/711 = 31.64%.
3.3 DCS/DEH System Software Configuration 3.3.1 DCS/DEH System Software Configuration Since the DCS/DEH system is an all-in-one configuration, its software configuration is the same.
XDPS-400 distributed control system software uses Windows95/98/NT system software, and WindowsNT-based real-time multi-tasking operating system RMX-X. Convenient and intuitive graphical configuration software conforming to IEC-1131-3, graphical display, report, control, and record statistics generation tool software.
XDPS system software (version 2.0) is divided into man-machine interface station MMI software, DPU process control software, and GTW gateway software. The MMI software can be installed on any computer that can run Windows 95/98/NT, with a Pentium 200MHz CPU and a memory requirement of 16M or higher. GTW software runs on MMI software. The DPU software can run on pure DPU hardware or on an MMI station. Real-time data network (A-net, B-net) Redundant bus network, which transmits real-time data, supports 1-250 network contacts, and the #3 and #4 units are practically only 8 network contacts.
After the MMI software is installed and the network is configured, the system configuration can be performed. The configuration includes global point directory configuration, graphic configuration, and DPU control configuration, and can be divided into online configuration and offline configuration. The MMI station is divided into four levels from high to low: SENG, ENG, SOPU, OPU. The OPU can only read and upload the DPU. The SOPU can modify the block parameters. The ENG can download and modify the DPU operation and all configurations. And function blocks, SENG in the ENG authority also has permission to upload files.
DPU can define 999 pages, each page can contain 999 function blocks, page execution cycle is 50mS-10S adjustable.
MMI software includes operator station software (including graphical display, single point display, alarm overview, alarm history, real-time and historical trend, report printing software, etc.) and engineer station software (including global point directory configuration, DPU graphic configuration, graphics Generation, report generation and reproduction, history recording software, etc.) When starting the operator station and the engineering station's MMI, the MMI master control software must be started.
Each I/O point number and system intermediate variable must be configured beforehand in the system hardware definition in the global point directory. Each process control process is done by different combinations of various algorithm blocks.
Software system resource usage:
â— #3 unit DAS/DEH system: #1 DPU configuration is 73 pages, each page is less than 80 blocks, the execution period of 1-68 pages is 200mS, and the execution cycle of 69-73 pages is 500mS.
â— #3 unit MCS/SCS system: #3 DPU configuration page 173, each page is less than 80, the implementation cycle is 500mS, a small part of the implementation cycle is 200mS or Ming or 250mS.
â— #4 unit DAS/DEH system: #5 DPU configuration is 74 pages, each page is less than 80 blocks, the execution period of 1-68 pages is 200mS, 250mS, 500mS, and the execution cycle of 69-73 pages is 200mS.
â— #4 unit MCS/SCS system: #7 DPU configuration page 177, each page is less than 80, the implementation cycle is 250mS.
In addition, adjustment parameters, measurement signals, upper and lower limits, alarm limits, key operation steps, actuator response times, power and auxiliary door switches, and start/stop output pulses are available at the engineering station (#30, #40). Width and other related parameters are defined and modified, and operation records, alarm records, and system status are consulted. The modification of the module parameters will also be limited by the level. After the modification, the disk must be downloaded. Otherwise, the DPU cannot track.
3.4 System Functions 3.4.1 Thermal Control Protection System 3.4.1.1 Boiler Protection System â— Fire protection The protection functions include furnace pressure protection, fuel interruption, all-air-inducing fan shutdown, B-fired boiler fire extinguishing, and drum water level protection.
â— A, B mill oil lubricant low pressure, high oil return temperature protection function, SCS system to achieve.
â— Boiler Saturated Steam, Superheated Steam Safety Door Protection Function 3.4.1.2 Turbine Protection System â— The main protection of the turbine has protection functions such as rotation speed, vacuum, axial displacement, bearing vibration, lubricant pressure drop, and faults in the generator and transformer group.
â— Turbine protection has the function of low oil pressure linkage.
â— With high water level, extraction reverse door protection.
3.4.2 DAS system This system is responsible for data acquisition and processing, with report management and printing, SOE signal acquisition and processing, operation and alarm records, flow charts, bar graphs, trends, operation screen display and operation functions.
Operation objects can be controlled on the operator station, such as: display and operation screen cut/change, automatic cut/throw, interlock cut/cast, coordinated mode selection/input, valve flapper and electric door switch operation, auxiliary machine The start and stop, etc., can be increased or decreased or directly set the target value operation. The operator station can display the process screen, operation and alarm records, alarm query, alarm confirmation and related parameter display. Total system:
--18 process screens -- 9 operation screens -- 6 coordinated control screens -- 2 auxiliary status screens for the boiler - 1 parental control operation mode selection screen -- the alarm list display system has a screen copy, Operation record print, alarm print, trend print, SOE signal print, etc.
Condensed water pressure and shaft seal pressure are output to the meter via AO.
The operator station can be set to a corresponding level of security to increase the security of the system.
3.4.3 MCS system This system through the continuous adjustment of the valve and the baffle, to start and stop the control of the powder machine to achieve the control of the thermal parameters of the furnace, so as to achieve the purpose of safe and economic operation of the unit. The system includes three parts: remote operation system, automatic adjustment system, and boiler parameter compensation system. Important adjustment parameters are processed by four choices, three choices, or two choices.
3.4.3.1 Remote Operation System:
Total throttle remote operation system Secondary throttle remote operation system Natural gas remote operation system Heavy oil ignition remote operation system Pulverizing remote operation system Feedwater by-pass remote operation system First and second-level backup temperature reduction remote operation system These remote operation systems are all in the operator The mouse and the keyboard are manually operated on the CRT screen of the station, and the operation mode is: the mouse inching switch operation or the keyboard setting switch operation.
3.4.3.2 Automatic adjustment system:
Parental Control Coordinated Control System Fuel Regulation System Hot Air Pressure Regulation System Air Induced Regulation System Water Supply Regulation System First Stage Temperature Control System Secondary Temperature Control System Coal Mill Load Regulation System Coal Mill Population Negative Pressure Regulation System High Water Level Adjustment The system master control coordination control system has: #3 (#4) furnace #3 (#4) machine basic, furnace basic machine tracking, furnace basic machine basic mode. #3 (#4) Furnace #4 (#3) Machine basic, furnace basic machine tracking, basic mode of basic furnace. #3 (#4) Furnace The furnace basic and furnace basic machine basic methods are #16 and #4. The energy balance principle is used for control. The load setting, the main steam pressure setting before the machine, the lifting load, etc. all have a speed limit, and can be set manually. When the relevant adjustment system or measurement circuit failure occurs, the load is automatically increased/ Reduce function.
Furnace basic machine tracking, the basic mode of furnace basic machine coordination method, the input must meet the following conditions: fuel adjustment, air supply regulation, induced draft regulation, water supply regulation are put into automatic.
The above-mentioned automatic adjustment system automatically controls the heating process, but it can also perform manual intervention according to specific conditions.
The auto-adjustment system can perform remote operation and automatic/manual cut-in by ball marker on the flow chart and operation screen. The adjustment system with back-up communicator can perform automatic/manual cut-in directly on the backup communicator.
On the fuel adjustment screen, 16 boilers were started and stopped by the boiler, and 16 sets of powder feeders also had the function of full stop operation, taking into account the operational reliability issues.
Any adjustment system equipped with a backup operation can be operated by a backup operation, with a higher priority than "soft operation."
When the MFT operates, the interlock shuts off the total damper and stops 16 units to the powder machine.
When the coal mill trips, it interlocks the hot damper and opens the cold damper.
When the discharge machine trips, the interlocking hot damper, #4 damper, and the cold damper are opened.
When the running side sends or draws the fan to trip, the interlock closes the corresponding baffle.
The automatic adjustment system records the operating alarm record regardless of which operating station or engineering station the automatic/manual cut-off or parameter failure or automatic over-limit loss has occurred.
The boiler parameter compensation system includes feedwater flow compensation, air supply air flow compensation, drum water level compensation and A/B main steam flow compensation.
Drum pressure, furnace superheater pressure, total primary air pressure, drum water level, hot hearth negative pressure, etc. are output to the indicator or log sheet via AO.
The important four-in-one, three-in-one or two-selection ones include drum water level, drum pressure, governor pressure, total air pressure, hot air pressure, furnace negative pressure, main steam pressure, and feedwater flow rate. Main steam flow, etc.
3.4.4 SCS system This system passes the on-off control and the interlocking control of the electric valve and the auxiliary machine of the furnace to improve the reliability of the equipment operation and achieve the purpose of reducing the labor intensity.
Enter the electric door and auxiliary machine of the SCS system. There are no operation switches and buttons on the disc. The electric door switch and furnace auxiliary machine start/stop operation screen is a dedicated screen made to imitate MAXl000.
The electric door switch and the auxiliary machine start and stop are all displayed on the CRT flow chart screen. The electric door switch has four kinds of color display, which indicates that the open, close, power off, and the valve are in the middle position. When the machine auxiliary machine accidental trip or start fails, it sends a signal to the external circuit accident sound alarm.
The pulse width time of the start and stop output of the electric door switch and furnace auxiliary machine can be modified at the engineer station.
The system includes the electric door remote operation system, the auxiliary operation and interlocking control system of the furnace, and the auxiliary machine accident sound control system. Excluding oxygen-free water supply systems, electric gates and accessories.
3.4.4.1 The electric door remote operation system includes 29 electric gates for all boilers other than the boiler accident discharge of 1 electric door and 1 electric door for empty exhaust, to realize the switching operation and adjustment operation of the electric door. After the FSSS four-level protection is put into use, when the drum water level is low, the bypass bypass electric door is interlocked.
3.4.4.2 The operating system of the auxiliary engine of the boiler includes 25 auxiliary machines except for one direct-current oil pump of the steam turbine and one set of the crank-motor motor, which realizes the start-stop operation of its auxiliary equipment, and has an alarm of start-up timeout and alarm of interlock failure. , start and stop allowing display and other functions.
3.4.4.3 Completion of the overall boiler interlocking (induction, delivery, discharge, powder power supply, fuel gas solenoid valve interlocking), low pressure of powdered lubricant, oil return temperature protection, and interlocking function of the milling powder to complete the turbine communication Oil pump, high pressure oil pump, injection pump, condensate pump and other interlocking functions. When interlocking, a human-machine dialogue is adopted to prevent misoperation, and it will not take effect until it is confirmed.
3.4.5 DEH system This system controls the speed and load of the turbo-generator set, and cooperates with the DCS to realize the coordinated control of the furnace, which improves the stability of the unit operation and the ability of peak adjustment.
The system has the functions of remote gate locking, swiveling, speed increase, automatic over-critical, constant speed, tightness test, 103%.110% overspeed protection, grid-connected (automatic synchronization), increase and decrease of load, etc., and can artificially set the target speed. And target load, rate of rise, etc. When the DEH system fails, the VCC card and the electro-hydraulic converter are normal, and a high-profile door operation can be performed in the DEH hard hand operation. When the DEH hard hand is in the automatic position, before the input of the dynamometer, the ESC adjusts the opening of the governing valve and inputs the dynamometer to control the generator power.
Mode switching and related operations can be performed on the operation screen or the operation panel. Such as: gate lock, grid connection, CCS remote control, dynamometer input, operation, maintenance, etc., can be set in the boot process target speed and lift rate, CCS remote control is not set when the target load.
The operating parameters and trends are displayed on the operator station and the engineer station to guide the operation.
4 System characteristics and effects 4.1 XDPS-400 system features XDPS-400 system has a good openness, flexibility and easy to understand, can easily adjust and modify the configuration and parameters of the control system online, when modifying parameters Does not affect the normal operation of the control system. The type, upper and lower limits of the measurement signal can be easily modified.
XDPS's standard algorithm modules include various PIDs, self-tuning control modules, arithmetic and logic operations, communicator, switch operators, lead lag, and digital logic. SOE resolution is less than 1mS (but must be the same as DPU, same BC board, same DI card), provides C language interface, and the user can generate other special algorithms such as state variables and fuzzy algorithms.
The XDPS-400 system has the above-mentioned special operation module, which can conveniently configure the control of the electric door and the auxiliary machine as well as the configuration of the adjustment system. It is also very easy to form an energy balance module.
Reports are generated and reproduced using MSEXCEL spreadsheet software. Its reports include periodic reports, triggered reports, data-reporting reports, and SOE-type reports. Finding is very convenient.
The system's alarm history record can easily query the operation performed by each operation station, and can easily analyze the unsafe phenomena that appear during the operation.
4.2 Features of low-voltage pure ESC system The system controller and controlled object are basically the same as the high-voltage pure electric control system. The actuator adopts low-pressure turbine oil, which is generally 1.2-2.0Mpa. The main oil pump of the main engine is used for fuel supply. The oil supply device, the electro-hydraulic converter adopts low-pressure turbine oil electro-hydraulic converters such as electro-hydraulic converters with amplifying structure of the force-distance motor butterfly valve, the oil motive maintains the original structure, and has a linear valve processing, a single multi-valve method, and a single valve. Multi-valve switching valve management.
4.3 Features of Units #3 and #4 Thermal Control System 4.3.1 Features of the Control Room The furnace control room has been completely transformed and the structure is novel.
4.3.2 Features of Thermal Protection System The FSSS system control is realized by PLC. The fire detection adopts MFSS-P12 mainframe processing and outputs the switch signal to the PLC to achieve four levels of fire protection. The furnace protection control system relays all use the Emmon relay.
4.3.3 Features of DCS system 4.3.3.1 DCS and DEH systems adopt an "integrated" structure. The networks of DCS and DEH of #3 and #4 units adopt the "integrated" structure, ie the data of DCS and DEH of #3 and #4 units. The highway communication network uses a pair of redundant networks. It connects 8 personal machine interface stations MMI (2 engineer stations and 4 operator stations) and 4 pairs of DPU process control stations to realize the data transfer of the parental control coordination control.
The principle of energy balance is used to realize the coordinated control of one furnace one machine operation, one furnace two machine operation, and crossover operation. The standard algorithm module of XDPS constitutes the turbine energy demand (P1*Ptsp/Pt) and the boiler heat signal (P1+dPb/dt). When two furnaces are running, the Ptsp of the turbine energy demand is used before #3 or #4. The pressure setting, then add the energy requirements of the two machines as the total energy demand. The operator station is provided with a coordination mode of the operating state switching screen for selection by the operating personnel. The #3 and #4 unit engineer stations can be used alternately, but the operation screens and process screens of the #3 and #4 unit operator stations are separated from each other.
4.3.3.2 The turbine adopts a single-valve controlled low-voltage pure ESC system, with functions such as remote gate locking, automatic synchronization, valve tightness test, speed and load control, 103% and 110% overspeed protection. All three operator stations in the boiler can be operated with pictures.
4.3.3.3 Air supply regulation system The boiler thermal system does not have a single blower. When the oxygen amount signal is used to adjust the damper opening of the blower population, the oxygen signal will have a large impact factor, poor stability, and large fluctuations. This will result in a windshield. The frequent switch of the board causes a total wind pressure to fluctuate, which affects the combustion and powder feeding. The stability of the system is poor, and this type of air supply regulation cannot be automatically operated for a long time.
After analysis, the adjustment method of the air supply regulation system is determined to be the cascade adjustment method of the total air pressure, load, and air volume, and the population opening of the air blower is adjusted to control the total air pressure. During the commissioning, it was found that the scheme was also problematic. Due to the actual condition of the boiler in the bean factory, a total damper was at the entrance of a bellows, and when the high and low loads were changed, the total pressure of the boiler changed greatly (2800-4100Pa), and the operator would adjust. ，出现两个控制对象控制一个测é‡å‚数问题，使被控å‚æ•°å‡ºçŽ°å¤±æŽ§ï¼Œæ ¹æ®çŽ°åœºç ”究采用çƒé£Žé£ŽåŽ‹ä½œä¸ºé€é£Žè°ƒèŠ‚的主调信å·ã€‚æ°§é‡è°ƒèŠ‚为手动远æ“系统，由16个二次分风门手动控制。
实践è¯æ˜Žè¿™ç§è°ƒèŠ‚æ–¹å¼æ•ˆæžœå¾ˆå¥½ï¼Œä½¿é€é£Žè°ƒèŠ‚能长期自动è¿è¡Œã€‚在å˜å·¥å†µåŠç¨³å®šå·¥å†µä¸‹ï¼Œè°ƒèŠ‚å“è´¨æŒ‡æ ‡å‡èƒ½æ»¡è¶³è¦æ±‚，并能满足机组调峰è¦æ±‚。
在#4炉é€å¼•é£Žç³»ç»Ÿä¸ï¼Œå¼•å…¥äº†äº¤æµç”µæœºçš„串级调速控制æ¥è°ƒèŠ‚风é‡ï¼Œç”±äºŽè¯¥ç³»ç»Ÿçš„å±€é™æ€§ï¼Œå°†æ¤ä½œä¸ºç²—调，对转速进行高负è·é«˜è½¬é€Ÿä½Žè´Ÿè·ä½Žè½¬é€Ÿçš„折线段调节，挡æ¿ä½œä¸ºç»†è°ƒï¼Œä¿è¯å…¶70-90%å˜åŒ–，从而达到节能效果。
4.3.3.4给水调节系统在给水调节系统ä¸ï¼Œä¸»ç»™æ°´å’Œå¤§æ—路的容é‡åŸºæœ¬ç›¸åŒï¼Œå› æ¤åœ¨æŽ§åˆ¶ç–略上采用2套独立的水ä½ã€è’¸æ±½æµé‡ã€ç»™æ°´æµé‡ä¸²çº§ä¸‰å†²é‡ç³»ç»Ÿï¼Œ
è¿è¡Œæ—¶æ ¹æ®éœ€è¦å¯ä»»æ„选择1套投入自动å‡èƒ½æ»¡è¶³è¦æ±‚。为了在负è·çªå˜æ—¶å‡å°æ°´ä½å差，在副调ä¸å¢žåŠ 了蒸汽æµé‡çš„负微分，让其在负è·çªå˜æ—¶æš‚æ—¶å°‘åŠ ç»™æ°´æµé‡ï¼ŒæŠµæ¶ˆ"虚å‡æ°´ä½"ï¼Œå¹¶ä¸”åŠ æœ‰å˜åŒ–率é™åˆ¶ï¼Œä¿è¯çªå˜ä½¿èµ·ä½œç”¨æ£å¸¸åŠ å‡è´Ÿè·æ—¶ä¸èµ·ä½œç”¨ã€‚由于给水æ¯ç®¡åŽ‹åŠ›ä¸èƒ½è°ƒèŠ‚，在å‚数调整时è¦ä¿è¯ç»™æ°´æµé‡å˜åŒ–ä¸èƒ½è¿‡å¤§ã€‚
è¿™ç§æ–¹å¼æŽ§åˆ¶çµæ´»ï¼Œç³»ç»Ÿç¨³å®šæ€§å¥½ï¼Œå½“主给水调门ä¸å¥½æ—¶ï¼Œå¯ç”¨å¤§æ—路投入汽包水ä½è‡ªåŠ¨ã€‚
4.3.3.5哈德曼执行器制ç–ç•¥é€ã€å¼•é£Žã€ç»™æ°´ç³»ç»Ÿçš„执行器为哈德曼执行器，控制方å¼ä¸ºï¼šæ“作器手动时用24V.DC电平控制，æ“作器自动时用MCS输出的4-20mA电æµæŽ§åˆ¶ã€‚è¿™æ ·è®¾è®¡å½“æŽ§åˆ¶ç”µæµ4-20mA回路开路或æ“作器故障输出零时，æ“作器å¯ç½®äºŽæ‰‹åŠ¨ï¼Œå¯¹åº”调门ä¸ä¼šå…³å®Œï¼Œå¯¹ç³»ç»Ÿå®‰å…¨æœ‰åˆ©ï¼ŒåŒæ—¶KE3伺放功能利用完全。
4.3.3.6在一ã€äºŒçº§å‡æ¸©ä¸²çº§è°ƒèŠ‚系统ä¸ï¼Œä¸ºäº†é˜²æ¢åœ¨æ±½æ¸©å低或å高，远离定值时，调节系统PID输出ä¸å‘生积分饱和ã€æ¯”ä¾‹è°ƒèŠ‚é¥±å’Œï¼Œå¢žåŠ äº†é˜€é—¨å…³å®Œæˆ–å¼€å®Œæ—¶å»¶æ—¶1S的系列脉冲切PID为跟踪功能，ä¿è¯æ¸©åº¦è°ƒèŠ‚在温度回å‡æˆ–下é™æ—¶çš„快速性，使å‡æ¸©è‡ªåŠ¨é•¿æœŸç»´æŒæŠ•å…¥ã€‚
4.3.3.7制粉负è·æŽ§åˆ¶ç³»ç»Ÿé¦–次æ出磨煤机入å£è´ŸåŽ‹è°ƒèŠ‚系统采用控制çƒé£Žé—¨çš„开度实现，ä¿è¯äº†åˆ¶ç²‰ç³»ç»Ÿæœ€å‰çº§è´ŸåŽ‹ç¨³å®šï¼Œä½¿ç£¨ç…¤æœºè¿›å‡ºå£å·®åŽ‹ã€å‡ºå£æ¸©åº¦æ›´èƒ½è¾ƒå¥½åœ°åæ˜ ç»™ç…¤è´Ÿè·å˜åŒ–，由çƒè¯•ç¡®å®šæœ€ä½³å·¥å†µï¼Œç”±æŽ’粉机入å£é£Žé—¨å¼€åº¦ç¡®å®šé€šé£Žå‡ºåŠ›ï¼Œæ ¹æ®ç£¨ç…¤æœºå…¥å£è´ŸåŽ‹å®šå€¼çš„改å˜ï¼Œèƒ½å¤Ÿé€‚应煤质å˜åŒ–时的干燥出力。
磨煤机负è·è°ƒèŠ‚系统采用噪声控制åæ˜ å‡ºçš„æ–™ä½ä¿¡å·ä½œä¸ºä¸»è°ƒä¿¡å·ï¼Œç£¨ç…¤æœºè¿›å‡ºå£å·®å’Œå‡ºå£æ¸©åº¦ä½œä¸ºå‰¯è°ƒä¿¡å·ï¼Œå®žçŽ°ä¸‰å†²é‡ä¸²çº§æŽ§åˆ¶æ–¹å¼ï¼Œå¹¶ä¸”利用振动给煤实现了自动控制。å•ç‹¬é‡‡ç”¨æ–™ä½ä¿¡å·çš„å•å†²é‡è°ƒèŠ‚也能实现调节，但å“应速度满，抗扰动性能差。
4.3.3.8SCS系统实现了锅炉总è”é”ã€åˆ¶ç²‰ç³»ç»Ÿä¿æŠ¤åŠè”é”ã€æ±½æœºè¾…机è”é”，在æ“作员站æµç¨‹å›¾ä¸Šè¿›è¡Œåˆ‡æŠ•æ—¶å°†å¼¹å‡ºäººæœºå¯¹è¯æ¡†ï¼Œé˜²æ¢è¯¯ç¢°çƒæ ‡çš„误æ“作。在辅机åŠç”µåŠ¨é—¨æ“作画é¢ä¸Šè®¾æœ‰å¯åŠ¨è¶…æ—¶ç‰æ•…障报è¦åŠŸèƒ½ï¼Œå¹¶å‘事故音å“装置å‘ä¿¡å·ã€‚
5.结æŸè¯è±†åå‘电厂#3ã€#4机组çƒæŽ§ç³»ç»Ÿæ”¹é€ 机炉控制室åŠä»ªè¡¨ç›˜å°å…¨éƒ¨ç„•ç„¶ä¸€æ–°ï¼Œçƒå·¥ä¿æŠ¤ç³»ç»Ÿå…¨é¢æ”¹é€ ，DCS/DEH系统采用上海新åŽå…¬å¸çš„XDPS-400分散控制系统，实现了DCS/DEH系统"一体化"ã€æ¯ç®¡åˆ¶å调控制，MCS/SCS系统å¯é ，其机组主控和å„系统å‡å…·æœ‰è¾ƒé«˜çš„稳定性和实用价值，特别是采用XDPSçš„æ ‡å‡†ç®—æ³•æ¨¡å—æž„æˆäº†èƒ½é‡å¹³è¡¡æ¨¡å—，DEH低压纯电调系统，具有å¯é 的转速åŠè´Ÿè·æŽ§åˆ¶ï¼Œä»Žè€Œä½¿æœºç»„调峰适应能力增强，制粉系统的自动控制é™ä½Žäº†åˆ¶ç²‰å•è€—。目å‰ï¼Œæœºç»„在安全ç»æµŽè¿è¡Œã€è¿è¡Œæ“作ã€ç›‘视和控制水平上已有很大æ高，机组在65-100%è´Ÿè·èŒƒå›´å†…能利用å调控制进行å‡é™è´Ÿè·è‡ªåŠ¨æŽ§åˆ¶ï¼Œå®žçŽ°ä¸€ç‚‰ä¸€æœºè¿è¡Œã€ä¸€ç‚‰ä¸¤æœºè¿è¡Œã€äº¤å‰è¿è¡Œçš„å调控制，且å„项å‚数基本ä¿æŒç¨³å®šï¼Œæ»¡è¶³æœºç»„安全稳定è¿è¡Œçš„è¦æ±‚。
#3ã€#4机组çƒæŽ§ç³»ç»Ÿæ”¹é€ 使机组的自动化水平上了一个å°é˜¶ï¼Œè¯¥é¡¹çƒæŽ§ç³»ç»Ÿæ”¹é€ 工程的实施是æˆåŠŸçš„。
ç”±äºŽè¯¥å·¥ç¨‹å±žäºŽæ”¹é€ é¡¹ç›®ï¼Œç”±äºŽèµ„é‡‘æœ‰é™ï¼Œéš¾å…有考虑ä¸å‘¨å…¨çš„地方，还å˜åœ¨ä¸€äº›é—®é¢˜æœ‰å¾…于进一æ¥æ€»ç»“，为今åŽæ”¹é€ 积累更多的ç»éªŒï¼Œä½¿ä¹‹åœ¨å¯èƒ½èŠ‚约资金ã€å–得效益的å‰æ下完善系统，最大é™åº¦åœ°æ高机组自动化水平，æ高安全性和ç»æµŽæ€§ï¼Œå‡è½»è¿è¡Œäººå‘˜åŠ³åŠ¨å¼ºåº¦ï¼Œå…‹æœå› è¿è¡Œäººå‘˜ä¸ªä½“差异带æ¥çš„机组è¿è¡Œå·®å¼‚，å‡å°‘维护工作é‡ï¼ŒçœŸæ£è¾¾åˆ°å‡äººå¢žæ•ˆã€åˆ›ä¸€æµçš„目的。
Reconstruction of Thermal Control System of 2×100MW Units in Douba Power Plant of Yibin Power Generation Plant
1. Engineering Technology Overview The thermal control system reconstruction project of 2×100MW unit of Doiba Power Plant in Yibin Power Generation Plant is a first-class enterprise based on the General Plant to improve safety, economic efficiency and adapt to the needs of the electric power simulation market to achieve the goal of reducing people’s efficiency. Yibin Power Generation Plant approved the major technological transformation projects approved by Sichuan Electric Power Company. The project was presided over by the Sichuan Electric Power Company for scheme validation, tendering and acceptance. The project was implemented jointly by Yibin Power Generation Plant, Sichuan Electric Power Test & Research Institute, Sichuan Electric Power Exploration & Design Institute, and Shanghai Xinhua.