System for recycling vent natural gas in compressor station

Abstract

The invention discloses a system for recycling vent natural gas in a compressor station and belongs to the technical field of natural gas recycling. The system comprises a multilevel gas power compressor, a gas reciprocating compressor and a controller. According to the coordination of the multilevel gas power compressor and the gas reciprocating compressor, the controller is utilized to control the opening and closing of a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a seventh electromagnetic valve based on a detection result transferred by a first pressure transducer, a second pressure transducer, and a third pressure transducer. Gas of differentpressure and different capacity discharged from a vent end of a pipeline compressor can be effectively supercharged in time so that the supercharged pressure can reach the requirement of predetermined recoverable pressure, and the recovery rate of vent natural gas in the compressor station is improved.

Description

technical field [0001] The invention relates to the technical field of natural gas recovery, in particular to a system for recovering emptied natural gas in a compressor station. Background technique [0002] During the service of long-distance natural gas pipelines, it is necessary to regularly vent the natural gas in the pipeline compressors for maintenance. In order to avoid the waste of vented natural gas and the environmental pollution caused by discharge into the atmosphere, it is necessary to recover the vented natural gas. Wherein, the pipeline compressor is provided with an inlet end connected with the upstream pipeline, an air outlet end connected with the downstream pipeline, and a venting end. [0003] Currently, pressurization loopback is performed by having a reciprocating compressor between the vent end and the intake end of the in-line compressor. [0004] The inventor finds that the prior art has at least the following problems: [0005] The reciprocating...

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Problems solved by technology

[0005] The reciprocating compressor not only cannot effectively pressurize the natural gas with a low pressure (for example, less than 4 MPa), resulting in a decrease in the recovery rate of the vented natural gas, but also when the amount of vented natural gas is less than the boosting capacity of the reciprocating compressor, the reciprocating compressor Can not effectively pressurize the vented natural gas

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