The role of the compressor unit in the chemical production process is to increase the pressure of the process medium to change the physical state of the material. Once the unit fails, the entire process will stop and cannot continue. The compressor unit plays an important role in the entire production process of the plant. It must have a complete real-time monitoring and protection system. A good monitoring system can detect and solve the abnormal situation of the unit in time, and protect the equipment by emergency stop when necessary to prevent further expansion of the accident. The control of the compressor unit mainly includes turbine speed regulation, compressor anti-surge control, vibration displacement monitoring protection of the compressor turbine and process control. The system is a set of turbine speed control, anti-surge control, Integrated control system with performance control, pumping control and self-protection interlocking logic control. Compared with the traditional compressor unit control scheme, it has the advantages of higher reliability, powerful function, flexible configuration and easy operation. Fund Project: The name of the Gansu Fund is based on the virtual technology of the automated control training room is mainly engaged in the production process automation professional teaching and research work. Surge is an inherent characteristic of centrifugal compressors. When the load drops to a certain value, the gas discharge amount will violently oscillate, and the gas flow rate and the exhaust gas pressure will periodically fluctuate at a low frequency and a large amplitude, and the body will also vibrate violently. It is a surge. How to prevent the occurrence of surge, first analyze the characteristic curve of the centrifugal compressor. As shown in the figure, it can be seen from the figure that there is a point with the highest ft/outer value at each speed. By connecting the highest points at different speeds, you can get a so-called surge boundary line, the surge line (SL). The shaded area on the left side of the boundary line is an unstable surge zone, and the right side of the boundary line is a safe operating zone. At 2 rpm, the load is greater than the compressor safety. Each compressor has its own characteristic curve. The characteristic curve is not only related to the compression ratio and the rotational speed n, but also related to the inhalation state of the compressed gas, such as molecular weight, temperature, pressure, etc.; It is related to the characteristics of the pipe network; the larger the capacity of the pipe network, the larger the amplitude of the surge, the lower the frequency; the smaller the capacity of the pipe network, the smaller the amplitude of the surge and the higher the frequency. Each compressor has its own surge zone. Therefore, only the corresponding anti-surge control scheme can be adopted to prevent the occurrence of surge. 2 ITCC system anti-surge control on the cracking gas compressor application of the cracking gas compressor set 4 section compression, 2 sets of anti-surge control loop, the anti-surge control process of the cracking gas compressor section 1, 2, 3 Fig., for the anti-surge control of the anti-surge 2.1 cracking gas compressor of the cracking gas compressor section 4, the setting of the anti-surge control of the cracking gas compressor is as follows: the outlets of the first, second and third sections are set Anti-surge control flow measurement FT103A/B, anti-surge control measurement transmitter is installed in the exit of the fourth stage into DCS and ITCC system respectively, anti-surge controller (FIC103, FIC121) is set in DCS, through PID After the operation, the output MV value enters the ITCC system. In this way, the operator can adjust the anti-surge control valve on the DCS, but choose whether to control the DCS or ITCC, and decide on the ITCC selection switch. The anti-surge control value realized on the ITCC is compensated for temperature and pressure in the anti-surge controller (UC103, UC121), and the actual flow value is calculated, and then the flow rate of the anti-surge control line (SCL) is calculated. For comparison, determine whether it is necessary to open the anti-surge control line (SCL) to determine the compressor surge point. The calculation uses the ratio of the square of the population flow to the multi-variable head. In some cases, the surge line is measured by the flow. The accuracy problem cannot be verified, and the best way to measure the surge point is to actually measure it on site. The anti-surge control margin is set to 5% to 15% of the flow when surge occurs, and this margin is set to the anti-surge control line (SCL) in the ITCC controller. The anti-surge control point needs to calculate some values ​​at different speeds. Based on the condition of the control system and the size of the valve, the recommended anti-surge control valve response time is at least 2 ~ 5s. For a safety margin of 10% or less, This response time is recommended or determined based on the rate of movement. Otherwise, the safety margin for anti-surge must be greater than 10%. 3ITCC system anti-surge operation on the crack gas compressor 3.1 Anti-surge control function The anti-surge control of the compressor is when the speed of the compressor reaches the rated speed , used by the operator. There are 3 modes of operation: manual, manual backup and automatic. Manually bypass all anti-surge control functions and directly control the anti-surge valve. The manual backup mode is applied when the compressor operating point is away from the surge control line, and the operator can manually control the anti-surge valve; however, when the compressor operating point is close to the surge control line, the anti-surge control HSS ( The high selection line) acts to force the anti-surge valve to fully open. In fact, the output value of the anti-surge valve is the higher of the manual signal or the automatic signal. The automatic mode is the control of the ITCC, and the output control anti-surge valve is output by calculating the process parameters such as the flow rate. This mode is the most rigorous form of control and the operator cannot open or close the anti-surge valve. It is the general picture of the anti-surge control function of the cracking gas compressor. 3.2 Anti-surge operation In the actual operation of the compressor, the multi-variable head is calculated according to the actual data taken, the working condition point is determined, and the distance between the operating point and the anti-surge control line (SCL) and the surge line (SL) is determined. For the standard cracking gas compressor performance curve, there is a BOOST line in the middle of the two lines, that is, the intermediate control line. When the operating point crosses the control line and reaches the BOOST line, the system determines that dangerous conditions appear, BOOST quickly Give a signal to open the anti-surge valve. If the system reaches a stable value, you need to manually reset before you can close the small anti-surge valve. In order to prevent the anti-surge valve from changing the micro output of the anti-surge valve, the valve life is shortened due to the non-stop opening and closing of the signal. When the output signal is about <2%, the valve does not operate. Only when the output deviation is greater than this size, Valve action. 5 Conclusion Based on centralized management and decentralized control design, the sewage treatment control system realized the full automation of the whole process of a county sewage treatment plant, greatly improving the automation control level and management level of sewage treatment. The system is easy to maintain and reduces labor intensity. Especially the redundancy of the system and the application of fieldbus technology ensure the safe and reliable operation of sewage production and the effective transmission of data, thus improving production efficiency. The successful commissioning of the system not only enabled the county's domestic sewage treatment water quality to meet emission standards, improved people's living environment, but also accumulated experience for similar sewage treatment projects, and has certain reference value.
CH/CS Cone Crusher
(1) CH/CS Cone Crusher is a single cylinder hydraulic structure. The equipment is designed according to heavy-duty working conditions. The main shaft is supported at the upper and lower points, and the stress conditions are good.
(2) The constant crushing chamber (CLP) design keeps the feeding and production capacity constant during the liner wear cycle, significantly reducing the operating cost.
(3) Up to ten kinds of cavity shape changes and up to four kinds of eccentricities can be set for an eccentric sleeve bushing, which greatly enhances the flexibility and adaptability of the equipment.
(4) Equipped with intelligent ore outlet adjustment system ASRI, the performance of the crusher can be maximized.
(5) Advanced liner wear monitoring and automatic compensation functions, operation data record query functions, and convenient network communication functions can significantly improve the maintenance level of equipment and optimize the coordination and control with other equipment in the system.
(6) Compared with CH type, CS type crushing chamber is higher and steeper, with larger feed inlet and larger carrying capacity. It is suitable for secondary crushing when the feed particle size is large. Its lower frame is interchangeable with CH crusher of the same specification.
Ch/Cs Topshell Assembly,Spider Bushing,Filler Ring,Support Ring Shenyang Ule Mining Machinery Co., Ltd , https://www.ulecrusherparts.com