1 process plan The pressure of the flare gas system is low, the pressure of gas and liquid is insufficient when it is self-pressured, and it is easy to contact with air. It is easy to form an explosion limit and tempering danger, and there are factors such as unstable gas volume, complex and variable physical composition, etc. Comprehensive consideration of factors. Through comprehensive analysis, we finally chose to use the variable frequency internal cooling screw compressor supercharging technology, and equipped with advanced automation control measures to successfully solve these difficulties. 1.1 Process Flow Brief To release air from 0.01 to 0.02 MPa, remove coarser impurities through the filter and then pressurize the screw compressor to 0.3MPa or more, 70 ° C; then enter the dry air cooler to cool to 40 ~ 50 ° C, enter the gas-liquid separator for gas and liquid Separation. A part of the gas phase is sent to the heating furnace as a fuel gas, and a part of the gas is fed into the compressor pre-separator inlet of the 40×104 Nm 3 /d treatment unit for recovery. The gas-liquid separator gas outlet is provided with a return valve group, the compressor unit adopts frequency conversion regulation, and the rotation speed is automatically controlled according to the incoming gas pressure and flow rate. Ensure that the speed and displacement of the screw compressor are within the normal working conditions, and keep the inlet section of the compressor in a slightly positive pressure state, so that the water in the water seal tank does not fall into the venting main pipe. The block diagram is shown in Figure 1. 1.2 key equipment selection The core equipment for flare gas recovery is a compressor. The correct choice of compressor is directly related to the investment size, production efficiency, and operating cost of the project. At present, compressors commonly used in domestic oil fields include reciprocating compressors and centrifugal compressors, and screw compressors are used less frequently; liquid ring compressors and axial compressors have also been added abroad. The performance comparison of the three domestic compressors is as follows: As can be seen from Table 1, the screw compressor has obvious advantages in its applicable field, especially in small displacement, large compression ratio and inlet medium containing liquid, impurities. The advantages of efficiency, investment, operation and maintenance are unmatched by other types of compressors. Even if there is a sulfur-containing working condition, it is only necessary to use a sulfur-resistant material for the inner parts of the compressor cylinder, the cathode and the anode rotor. The project adopts twin-screw compressor to achieve the same suction and gas suction, avoiding the installation of large gas cabinets or washing tanks, and using internal cooling (water) to solve the problems of high exhaust gas temperature and high noise. 1.3 Automation control The instrument control system of this project adopts PLC control system, and communicates with the established DCS system of the processing station through RS485 interface to realize unified management, real-time deployment, venting the water sealing tank of the torch area to set the automatic water supply pipeline, and set the torch condensate pump The automatic pump stop facility ensures that the flare gas is preferentially pumped to the screw compressor while avoiding air entering the recovery gas system. The water level control of the water seal tank is interlocked with the inlet pressure detection of the compressor to ensure the reliability of the system operation. The compressor and air cooler are controlled by the inverter, and the impeller speed is adjusted according to the compressor displacement, exhaust temperature and separator liquid level. 2 new technology applications This project adopts more new technologies and new applications. It can be summarized as follows: (1) Twin-screw compressor technology, compressors and air coolers all use variable frequency technology to control displacement and temperature; (2) internal compressor Supplementary cooling water technology; (3) Compressor return gas technology to improve production safety; (4) Gas-liquid separator coolant reflux technology, saving cooling water consumption and reducing operating costs; (5) Water sealing tank Automatic water replenishment technology improves production safety factor; (6) Torch condensate pump automatic pump stop technology not only ensures production safety and reliability but also facilitates operation; (7) Buried sewage tank pressure oil and gas technology in flare gas recovery project The new application ensures that the effluent of the venting system is recovered while recovering the air; 3 Conclusion After the project is put into production successfully, the Lunan Joint Processing Station recovers about 4×104 Nm3 of natural gas every day, and recovers about 20m3 of natural gas condensate. The economic benefits and environmental benefits are obvious. This project provides a good material for recycling and releasing air in domestic onshore oilfields, which can be promoted and applied. Its economic benefits, environmental benefits and social benefits are enormous. Liquid Cold Plate,Liquid Cooling Plate,Water Cooling Plate,Water Cold Plate Suzhou Wint Electric Co., Ltd , https://www.winforthermal.com