Explosion-proof method of LNG (liquefied natural gas) filling machine

Abstract

The invention discloses an explosion-proof method of an LNG (liquefied natural gas) filling machine. The method comprises the steps: A, providing an LNG filling machine, wherein conducting parts of the filling machine are arranged in a first chamber in a centralized mode, liquid supply parts of the filling machine are arranged in a second chamber, and the first chamber is communicated with the second chamber by virtue of a through hole; B, providing a gas source capable of continuously supplying the safety gas, wherein the gas source is communicated with the first chamber, and the gas source is used for continuously supplying safety gas to the first chamber; C, providing a pressure differential switch, wherein the pressure differential switch is arranged in the first chamber and communicated with a control system of the LNG filling machine; enabling the LNG filling machine to be powered on by virtue of the control system when the pressure P1 of the first chamber and the pressure P2 of the second chamber monitored by the pressure differential switch are continuously maintained: (P1-P2) is more than or equal to 50Pa; controlling the LNG filling machine to be powered off when the fact that the (P1-P2) is less than 50Pa is detected by the pressure differential switch. According to the explosion-proof method, a good explosion-proof effect can be achieved by utilizing an ordinary electrical element, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to an explosion-proof method, which is applied to an LNG filling machine. Background technique [0002] At present, all domestic LNG filling machines need to be treated with explosion-proof treatment. The filling machine includes at least two chambers, one chamber is used to place electrical and control parts, and the other chamber is used to arrange LNG pipelines. If there is a natural gas leak in the LNG pipeline in the machine, the natural gas will diffuse and come into contact with the charged electrical and control parts, and an explosion will occur once an electric spark occurs. The commonly used explosion-proof methods generally adopt explosion-proof structures or increased safety structures, and some conductive components are placed in explosion-proof isolation boxes, while other electrical components that are not placed in explosion-proof isolation boxes use electrical components with explosion-proof functions. , and the...

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Problems solved by technology

[0002] At present, all domestic LNG filling machines need to be subjected to explosion-proof treatment. Each filling machine includes at least two chambers, one chamber is used to place electrical and control parts, and the other chamber is used to arrange LNG pipelines. If there is a natural gas leak in the LNG pipeline in the machine, the natural gas will diffuse and come into contact with the charged electrical and control parts, and an explosion will occur once an electric spark occurs

The commonly used explosion-proof methods generally adopt explosion-proof structures or increased safety structures, and some conductive components are placed in explosion-proof isolation boxes, while other electrical components that are not placed in explosion-proof isolation boxes use electrical components with explosion-proof functions. , and the cost of electrical components with explosion-proof function is much higher than that of ordinary electrical components, which causes an increase in the cost of the filling machine and affects the promotion of the filling machine

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