Instant saturation system of LNG liquid adding device

Abstract

The invention discloses an instant saturation system of a LNG liquid adding device. The system comprises a storage tank for storing LNG, a liquid conveying pump, a main pipeline, a shunting pipeline, a mixing device and a gas adding machine; the LNG in the storage tank flows into the liquid conveying pump through a liquid outlet pipeline; the LNG output by the liquid conveying pump flows into the main pipeline for shunting through the shunting pipeline; the shunting pipeline includes a liquid-phase pipeline and a heating pipeline; and a heated natural gas-liquid mixed flow in the heating pipeline is mixed with a low-saturation-state LNG separated flow in the liquid-phase pipeline in the mixing device, and is injected in the gas adding machine. Through the mode, the system has no need to synchronously perform the saturation circulating operation for total LNG in the storage tank; gas-added vehicles have no need to park for waiting; the LNG flowing out from the storage tank when injecting the vehicles only needs to be shunted before injecting in vehicle cylinders; one low-flow LNG separated flow is mixed with the low-saturation-state LNG in the liquid-phase pipeline after heating; and the mixed high-saturation-state LNG is injected in the vehicle cylinders to realize an instant saturation function of the LNG liquid adding device.

Description

technical field [0001] The invention relates to the technical field of LNG filling stations, in particular to an instant saturation system of an LNG filling device. Background technique [0002] At present, in the LNG fuel market for vehicles, there are usually two ways to make LNG reach the saturation state required by the engine: [0003] The first is to carry out saturated cycle operation on the LNG in the storage tank of the LNG filling station as a whole, that is, the LNG in the low saturation state in the storage tank is transported by the pump, heated by the heater, and then returned to the storage tank, and the Low saturation LNG is mixed; through such a continuous cycle operation, the overall LNG saturation in the storage tank can be increased, and then the LNG with higher saturation can be directly injected into the vehicle bottle, so as to meet the requirements of the vehicle engine. And there is no need to additionally configure a booster device on the vehicle b...

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Problems solved by technology

[0004] But this method has two disadvantages: 1) It reduces the maintenance time performance of the storage tank (because at this time, the LNG in the storage tank will be more saturated than the LNG unloaded from the tank car after the artificial saturation cycle operation at this time) The height is much higher, which makes it easier for the safety valve of the storage tank to open and discharge);

[0005] 2) The saturation cycle operation process takes a long time. Before the saturation cycle operation process is completed, the LNG saturation in the storage tank cannot meet the engine requirements of the vehicle

[0007] The disadvantage of this method is that the pressurization speed is relatively slow: when the gas cylinder is filled with low-saturation LNG, it is difficult to maintain the pressure of the gas cylinder at a level that meets the intake pressure requirements of the engine in the first few hours, and it is difficult to The engine provides gas with continuous and stable pressure and flow

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