LNG leakage emergency meeting collecting system

Abstract

The invention discloses an LNG leakage emergency meeting collecting system which is mainly composed of collecting grooves, a converging channel, a liquid collecting pond, a liquid phase recovering device and a gas phase collecting and emitting device. According to the technical scheme, the collecting grooves distributed around an LNG storage tank and below a liquid phase pipe collect LNG liquid phase leaked in an accident, and the LNG liquid phase is converged to the liquid collecting pond through the converging channel; the liquid phase recovering device is adopted for recovering the LNG liquid phase in the liquid collecting pond to a trouble-free LNG storage tank or tank car; and the gas phase collecting and emitting device is adopted for collecting combustible steam cloud in the liquid collecting pond, the combustible gas concentration is controlled to be lower than 1%, and combustible gas is safely emitted to atmosphere through an LNG station yard emitting pipe. According to the LNG leakage emergency meeting collecting system, the liquid phase and the gas phase of LNG leaked in the accident can be collected at the same time, the LNG evaporation diffusing capacity is reduced as many as possible, the collected LNG liquid phase is recycled, the problem that at present, in an LNG station yard leakage accident, a person can only passively restrain LNG evaporation rate or increase the combustible steam cloud diffusion rate is solved, and an effective method is provided for emergency meeting treatment of the LNG station yard leakage accident.

Description

technical field [0001] The invention relates to a process method for recovering and reusing LNG leaked in a liquefied natural gas (LNG) station in a liquid phase, and then diluting it in a gas phase and releasing it safely. It specifically relates to an emergency collection system for LNG leakage, which belongs to the technical field of emergency disposal of LNG leakage accidents . Background technique [0002] LNG has become one of the main gas sources for cities and towns that cannot use pipeline natural gas at present, and it is also often used as an emergency peak-shaving gas source for large and medium-sized cities. There is a large amount of LNG stored in the LNG station. Once the storage tank or liquid pipeline leaks, the leaked LNG will quickly gasify and spread. Due to the low temperature of the LNG vapor cloud, a large amount of condensed water vapor is contained in the vapor cloud, and its density is higher than that of air, which makes the LNG vapor cloud diffic...

AI Technical Summary

Problems solved by technology

[0004] However, the existing methods have the following deficiencies: 1) For the LNG leaked in the accident, it is only stored in the cofferdam or the liquid collection pool, and then passively covered with high-expansion foam to reduce its evaporation rate. its recycling storage

This emergency response method takes a long time, and the risk of secondary accidents such as fire and explosion has not been effectively alleviated and controlled fundamentally.

2) The leaked LNG liquid phase has not been effectively recovered and reused, which pollutes the environment and wastes energy

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