Liquid unloading method of LNG prying-mounting station

Abstract

The invention discloses a liquid unloading method of an LNG prying-mounting station, and the problem of a first-generation LNG prying-mounting station in the prior art that liquid adding operation cannot be performed while liquid is unloaded, so that working efficiency is lowered is solved. The liquid unloading method comprises the following steps that 1, after a tank car reaches the station, a liquid unloading liquid-phase pipe, a gas-phase pipe and a boosting pipe of the tank car are separately connected to corresponding pipelines of a gas storage cylinder; 2, pressure between the gas storage cylinder and the tank car is balanced, and pressure balancing is stopped when pressure of the gas storage cylinder reaches a preset value; 3, the tank car is boosted, so that pressure of the tank car is higher than that of the gas storage cylinder; 4, a valve at the root part of a liquid outlet pipe of the gas storage cylinder is manually closed; meanwhile, a liquid unloading liquid-phase manualvalve and a pneumatic valve are manually opened; LNG liquid flows into a pump pool, and then enters a gas-phase pipeline on the top of the storage cylinder through an overflow valve of the pump pool;and the liquid of the tank car is unloaded to the storage cylinder through the gas-phase pipeline. By adopting the liquid unloading method, the first-generation LNG prying and mounting station, liquid adding operation can be performed while liquid unloading is performed, so that the working efficiency can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of liquid unloading at an LNG skid loading station, in particular to a method for unloading liquid at an LNG skid loading station. Background technique [0002] In the first generation of LNG skid loading stations, the pump skid valves are mostly manual valves. When unloading liquid, the system mode must be switched to manual mode to unload liquid, so it is impossible to add liquid while unloading liquid, which greatly affects work efficiency. The gas station is exactly this generation of LNG skid loading station, so a liquid unloading method applied to the first generation LNG skid loading station is designed, so that the first generation LNG skid loading station can also carry out liquid filling work while unloading liquid, so as to improve work efficiency , has become a technical problem to be solved urgently by those skilled in the art. Contents of the invention [0003] The technical problem to be so...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a method for unloading liquid at an LNG skid loading station, which solves the problem in the prior art that the first generation LNG skid loading station cannot simultaneously perform liquid filling operations while unloading liquid, thereby reducing work efficiency

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