A natural gas cracking gas compression system

Abstract

The invention provides a natural gas cracking gas compression system, the system includes a compressor connected to the cracking gas washing tower and a cooling tower connected to the compressor; the cooling tower is connected to the pre-washing tower through a compressor outlet valve; the compressor includes a The compressor and the second-stage compressor, a first-stage compression cooling tower is arranged between the first-stage compressor and the second-stage compressor, and a second-stage compression cooling tower is arranged between the second-stage compressor and the outlet valve of the compressor; the second-stage compression cooling tower and A check valve is arranged between the compressor outlet valves. The natural gas cracking gas compression system provided by the present invention prevents subsequent system instability caused by reverse series of gas in the pre-washing tower during shutdown by setting a check valve. The natural gas cracking gas compression system provided by the present invention is provided with one or two sections of compression outlet pressure release pipelines, which completely solves the problem of inversion, and avoids the venting of natural gas and cracked gas when the compressor is turned on and off, saving production costs.

Description

technical field [0001] The present invention generally relates to a compression device, and more specifically relates to a compression system for cracked natural gas. Background technique [0002] In the process of preparing acetylene by cracking natural gas, the methane in the cracking furnace undergoes partial oxidation reaction, and part of the methane is cracked to generate cracked gas. The cracked gas is washed by the scrubber T120 to remove carbon black, and the cooled cracked gas is sent to the inlet and outlet of the cracked gas compressor. The acetylene-rich circulating gas from the enrichment process is mixed. In order to achieve effective absorption and separation of acetylene, carbon monoxide, hydrogen, diacetylene and vinyl acetylene in the pyrolysis gas in the enrichment process, the pressure of the pyrolysis gas needs to be increased. [0003] In the traditional compression system, there is a large amount of higher hydrocarbon gas in the cracked gas. After thi...

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Problems solved by technology

[0003] In the traditional compression system, there is a large amount of higher hydrocarbon gas in the cracked gas. After this part of the gas is compressed and cooled, a large amount of solid polymer will be formed, and a part of the solid polymer will be stored in the outlet pipeline, and the outlet pipeline The exhaust valve is a cage valve, and its valve lifts vertically. When there is sediment in the pipeline, the valve cannot be completely closed. When the compressor stops, because the discharge valve cannot be completely closed, it will cause high pressure in the thickening device. The gas goes back to the unit, causing the compressor to reverse. At the same time, the high-pressure gas in the cooler will also go back to the compressor body, which intensifies the compressor's reverse.

The reverse rotation of the compressor will destroy the lubricating oil film and damage the bearing, while the instantaneous reverse rotation of the compressor will cause the rotor to bear huge torque and be easily damaged. At the same time, it will also damage the sealing device of the compressor and affect the stable operation of the system

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