Integral type double-way vacuum pipe

Abstract

The invention discloses an integral type double-way vacuum pipe. The integral type double-way vacuum pipe comprises a heat preservation outer pipe, an air return pipe, a liquid inlet pipe, a confluence pipeline and sealing covers; the outer pipe is sleeved on the air return pipe, the air return pipe is sleeved on the liquid inlet pipe, the confluence pipeline is arranged at the end part of the heat preservation outer pipe, the confluence pipeline is independent from the liquid inlet pipe at the end part of the heat preservation outer pipe and is in communication with the air return pipe in a sealing mode, a heat preservation layer is arranged between the heat preservation outer pipe and the air return pipe, the liquid inlet pipe is eccentrically arranged in the air return pipe, one end ofthe liquid inlet pipe is fixedly connected with the inner wall of the air return pipe, the central axis of the liquid inlet pipe and the central axis of the air return pipe are not collinear, the sealing covers are arranged at the two ends of the heat preservation outer pipe, and the liquid inlet pipe protrudes out of the sealing covers at the two ends; an air inlet pipe and the air return pipe serve as a pipeline, the problems that due to heat brought by double pipelines, low-temperature liquid is vaporized, the temperature of a tank body is increased, BOG gas is increased, the pressure of the tank body is increased, emission is increased, and losses are larger can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of vacuum pipeline transportation, in particular to an integral two-way vacuum pipeline. Background technique [0002] Vacuum tubes are generally used in LNG filling station process pipelines, which have a good cooling effect and can reduce the gasification of LNG into BOG during operation. They are very important process pipelines in the entire LNG filling process. But at present, most of the manufacturers on the market are adopting that the liquid inlet and the liquid return are separated into two pipes. The disadvantages and shortcomings of the two tubes are mainly manifested in the following aspects: [0003] 1) The heat generated by the two pipes is always larger than that of a single pipe, which increases the generation of BOG, and the pressure of the tank increases rapidly, which will cause excessive discharge of LNG; [0004] 2) No matter on the skid or in the on-site pipeline, there is always a na...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to: address the above problems, to provide an integral dual-circuit vacuum tube, which solves the problems in the prior art that the gas and liquid pipelines are independently installed in the NG filling station process to increase installation and transportation space and increase maintenance costs, and The heat generated by the two independent pipelines is always too high, which increases the generation of BOG, which leads to the rapid increase of the pressure of the tank and causes the problem of excessive LNG discharge

Images