Method for implementing self-pressurization of unpowered power supply at LNG (liquefied natural gas) skid-mounted station

Abstract

The invention discloses a method for implementing self-pressurization of an unpowered power supply at an LNG (liquefied natural gas) skid-mounted station. An initial part of a gas supply branch is provided with a control valve on the basis of an existing device of an LNG skid-mounted station; a boosting branch is separated again from the original gas supply branch, and a boosting device is arranged on the boosting branch, and a booting regulating valve is arranged between an LNG storage tank and the boosting device, wherein the other end of the boosting branch is communicated with the top of the LNG storage tank, so that the boosting branch and the LNG storage tank are communicated to form a loop; the LNG shunted into the boosting branch is gasified rapidly by utilizing the boosting device, and gasified natural gas flows back to the top of the LNG storage tank so as to enable the unpowered power supply at the LNG skid-mounted station to achieve self-pressurization. According to the invention, not only can the method be simple and convenient, the structure is simple, and the cost is low; low-temperature immersed pumps with high cost and high electricity quantity can be replaced; the difficulty that low-temperature immersed pumps cannot operate normally under the conditions of power failure or insufficient supplied electricity quantity in remote and mountain areas and the like is solved.

Description

technical field [0001] The invention relates to a method for self-pressurizing an LNG skid-mounted station without power supply, and belongs to the technical field of LNG skid-mounted station implementation. Background technique [0002] At present, the mobile skid-mounted LNG gas station promoted and constructed in China mainly adopts the skid-mounted integration technology to integrate the storage device, filling system and control system of the gas station on a skid-mounted base to form a closed-loop control system. equipment. The filling system of the LNG skid loading station is mostly connected to the LNG cryogenic submersible pump and LNG filling machine to supply gas to the vehicle. However, the LNG cryogenic submersible pump needs 380V power supply and frequency conversion speed regulation In conjunction with the use of the device, the process and piping are complicated and the cost is high, and the power supply consumes a lot of power and the cost is high. Especial...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the problem to be solved by the present invention is to provide a method for self-pressurizing the LNG skid-mounted station without power supply to replace the low-temperature submersible pump with high cost and high power consumption, and to overcome the problems caused by power failure or The problem that the cryogenic submersible pump cannot work normally due to insufficient power supply in remote mountainous areas

Images