The safety structure employs a structure that guarantees the safety of the compressed medium after the seal fails. When the seal fails, the compressed medium will not leak into the lubricating oil system, but will return to the compressor inlet. The gas leaking into the lubricating oil will be vented at a high level and will not leak at a low level, thus ensuring the safety of the compression system and the compressor room.

Synchronous gear wet screw compressor with synchronous gear structure, synchronous gear with thick and thin tooth structure is installed on the male and female rotors to ensure that there is always a certain meshing gap between the rotors without touching each other, and the rotor does not need lubrication when meshing. When the rotor diameter of the bearing structure is greater than 400 mm, a radial sliding bearing is arranged between the sealing device of the female and male screws and the synchronous gear. The exhaust end is provided on the outer side of the sealing device of the female and male screws, and is provided with a thrust radial sliding bearing and a thrust sliding bearing. All bearings are cooled and lubricated by the pressure oil delivered from the station. The radial plain bearing supports the screw to withstand radial forces. When the rotor diameter is less than 400mm, the rolling bearing is adopted, and the structure is relatively simple.

Different process flows and control parameters can be used when the process recycles different types of combustible gases. The basic process flow of large medium and high pressure combustible gas recovery equipment.

Basic process of large medium and high pressure combustible gas recovery unit (1) When oil field associated gas recovery and recovery, crude oil, water and natural gas enter the storage tank after preliminary separation by the three-phase separator at the joint station, and the crude oil in the storage tank is accompanied by part of natural gas. This part of natural gas is dangerous and pollutes the environment, and wastes energy. After installing the large medium and high pressure combustible gas recovery unit, it is necessary to ensure the normal operation of the original system, and to recover the natural gas to the maximum extent. The working pressure of the crude oil storage tank is -50200Pa, and the natural gas flow rate is dynamically changed, so the process flow and Control puts high demands on it.

To this end, a water-sealed can is installed at the inlet of the recovery device, a hydraulic safety valve is installed on the top of the crude oil storage tank, and an automatic regulating valve and a pressure switch are installed at the inlet of the compressor to ensure that the storage tank operates under a safe pressure. Since natural gas is flammable, the temperature will increase after compression, so the spray is used to control the outlet temperature. The spray can also seal and reduce noise, which can improve the safety and efficiency of the system operation.

(2) The propylene recovery system adopts the structure of two-stage compressors in series to directly pump recovery, compressive cooling and separate propylene gas. The specific process is that propylene gas is sucked from the first-stage compressor and reaches 0.5 MPa after compression and intermediate cooling. 40 state. Then enter the second stage compressor compression, raise the pressure of propylene gas to 2.0MPa, and the temperature is not more than 85, then cool down, reduce the temperature of the material to 40, then enter the separation tank, separate the liquid propylene, and send the ball The tank, which is not condensed, is discharged to the venting tower via the venting net.

At present, the large medium and high pressure combustible gas recovery unit has formed a series of products, which can produce the largest screw compressor in China. The single machine gas volume reaches 500m3/min, the screw rotor diameter is 153630mm, the inlet volume flow rate is 2500m3/min, and the inlet pressure is not less than -0.075. MPa (G), the outlet pressure is not more than 2.5MPa.

Application examples In the gas recovery system of the Second Oil Plant of Fushun Petrochemical Company of China National Petroleum Corporation, two LG25/0.5 gas-fired screw compressors (one open and one standby) developed by our company were used. The unit was installed, commissioned and put into operation in March 2003. It has been running smoothly for nearly 8000 hours in March 2004. The gas that was originally burned out has been recycled and used to meet the design requirements. The total investment of the device is 3.2 million yuan, calculated according to the running time of 300d/a, the gas price of 1.00 yuan/m3, and the recovery of flammable gas volume of 10.8 million m3/a. The income is 10.8 million yuan/a. According to the operating electricity cost of 576,000 yuan/a, The water fee, management fee and labor cost are calculated at 600,000 yuan/a. The investment recovery period is 3.9 months, and the added benefit is 6.42 million yuan/a.

Gantry Shear

Hydraulic gantry SHEAR machine is compact in structure, and its body is made of steel plate welded into a box structure, with stable mechanical properties. The shear cylinder is connected by ball joint, which improves the stability and service life of the cylinder, adding the front plate guide device, and improves the stress condition of the whole machine. It is one of the ideal equipments in metal recovery industry and casting workshop for charge processing.

Technical Parameter

Gantry Shear,plate shear,metal shear,shearing machine,metal cutting machine

Jiangsu Dalongkai Technology Co., Ltd. , https://www.dlkhydraumatic.com