Hydraulic natural gas compressor intake system, gas filling sub-station and gas unloading method

Abstract

The invention provides a hydraulic natural gas compressor intake system, a gas filling substation and a gas unloading method. The air intake system includes a position detection device and two discharge pipelines; the position detection device is used to detect the position of the compressor piston in the suction chamber; the two discharge pipelines are connected in parallel, each inlet is used to connect to an air source, and the outlet is connected to the compressor The air intake pipeline of the machine is connected; the control valves are set on the two discharge pipelines; the control valves are connected with the position detection device by communication, and can be opened or closed by the signal of the position detection device; the gas source connected to one of the discharge pipelines is sent to the compressor. When the pressure of the air source is lower than the preset value and the position sensor detects that the piston moves to the predetermined position of the suction chamber, the control valve of the other air discharge line is opened so that the other air source can flow to the suction chamber. The air cavity is replenished and unloaded. The invention can improve the operating efficiency of the compressor and improve the unloading rate.

Description

technical field [0001] The invention relates to the field of natural gas transportation, in particular to an intake system of a hydraulic natural gas compressor, a gas filling substation and a gas unloading method for the gas filling substation. Background technique [0002] Compressed natural gas locomotives that use compressed natural gas (CNG) as fuel require a dedicated fueling delivery system when refueling. In places where there is no natural gas pipeline network coverage, a natural gas refueling sub-station system needs to be built to achieve this. Hydraulic natural gas compressor sub-station is widely used because of its advantages of simple process, low noise and convenient maintenance. The core equipment of the hydraulic compressor sub-station is a hydraulic natural gas compressor. The trailer transports CNG from the refueling main station to the sub-station, and unloads the gas through the hydraulic natural gas compressor of the sub-station. The hydraulic natural ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hydraulic natural gas compressor air intake system, which solves the problems in the prior art that the hydraulic natural gas compressor intake pressure fluctuation range is large, the power matching range of the hydraulic system is large, and the trailer discharge rate is low.

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