Hydraulic natural gas compressor intake system, secondary fueling station and gas discharge method

Abstract

The invention provides a hydraulic natural gas compressor intake system, a secondary fueling station and a gas discharge method. The intake system comprises position detecting devices and two gas discharge pipelines; the position detecting devices are used for detecting the positions of a piston of a compressor in suction cavities; the two gas discharge pipelines are connected in parallel; an inlet of each gas discharge pipeline is used for being connected with a gas source; outlets of the gas discharge pipelines communicate with an intake pipeline of the compressor; each gas discharge pipeline is provided with a control valve; the control valves and the position detecting devices are in communication connection, and can be controlled by signals of the position detecting devices to be opened or closed; gas is discharged to the suction cavities of the compressor by the gas source connected with one of the gas discharge pipelines, and when the pressure of the gas source is less than a preset value, and the position sensors detect that the piston runs to the preset positions of the suction cavities, the control valve of the other gas discharge pipeline is opened to make the other gassource to supplement the discharged gas to the suction cavities. The hydraulic natural gas compressor intake system, the secondary fueling station and the gas discharge method provided by the invention are capable of increasing the running efficiency of the compressor and the gas discharge efficiency.

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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