Skid-mounted LNG leakage diffusion restrain and emergency device for LNG stations

Abstract

The invention discloses a skid-mounted LNG leakage diffusion restrain and emergency device for LNG stations, and belongs to the technical field of safety engineering of liquefied natural gas. The skid-mounted LNG leakage diffusion restrain and emergency device comprises a movable skid-mounted pedestal, the movable skid-mounted pedestal is provided with a foam mixed liquor barrel and a nitrogen steel cylinder, the nitrogen steel cylinder and the foam mixed liquor barrel are connected through a nitrogen delivery pipe. A high-multiple foam generator is disposed over the foam mixed liquor barrel, the foam mixed liquor barrel is connected with the high-multiple foam generator through a foam mixed liquor delivery pipe, an explosion-proof blower is mounted to the rear end of the high-multiple foam generator, the explosion-proof blower is connected with a mobile power supply, and the mobile power supply is disposed on the movable skid-mounted pedestal. The skid-mounted LNG leakage diffusion restrain and emergency device for LNG stations can be applied to places such as an LNG station, an LNG receiving station, a liquefaction factory, an LNG peak-shaving station and a liquefied petroleum gas station. The skid-mounted LNG leakage diffusion restrain and emergency device can be immediately used if large-area leakage occurs in an LNG station, high-multiple foam is generated to restrain the steam cloud in an LNG liquid pool of evaporation and diffusion, the evaporation rate can be reduced, and the severe secondary disaster can be prevented.

Description

technical field [0001] The invention belongs to the technical field of liquefied natural gas safety, in particular to a skid-mounted emergency equipment for suppressing LNG leakage and diffusion in LNG stations. Background technique [0002] In recent years, my country's liquefied natural gas industry has expanded rapidly, and many LNG liquefaction plants, LNG receiving stations, and a large number of LNG filling stations have been put into use. Due to the extremely low temperature of LNG (-162°C) and the large gas-liquid expansion ratio, once LNG leaks during storage, it is extremely volatile and forms an explosive mixture with air, and there is a danger of fire and explosion when encountering an ignition source. Therefore, suppressing the evaporation and diffusion of LNG after leakage and reducing the evaporation rate can prevent the further diffusion of LNG, avoiding personal injury and the formation of LNG fires. [0003] High-expansion foam is a method recommended by N...

AI Technical Summary

Problems solved by technology

But at present, the storage tank capacity of LNG filling station is generally 60-180m 3 , if a leak occurs, a liquid pool is formed, and the vapor cloud formed by diffusion is very likely to encounter an ignition source and cause a large-scale fire, causing serious consequences

In large places such as LNG receiving stations and liquefaction plants, although there are fixed high-expansion foam systems, if LNG leaks at a location far away from the liquid collection tank, it will also cause large-scale vapor cloud diffusion, causing serious consequences

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