Gas output pipeline of liquid natural gas storage tank

Abstract

The invention discloses a gas output pipeline of a liquid natural gas storage tank. The gas output pipeline is horizontally arranged, the upper part of the cross section of the gas output pipeline isarc-shaped, and the lower portion of the cross section of the fuel gas output pipeline is provided with a flow stabilizing portion gradually reduced in the direction away from the upper portion; and the gas output pipeline is used for conducting heat to the liquid natural gas inside the gas output pipeline, the liquid natural gas is heated and gasified to absorb heat, the temperature of the gas conveying pipeline is reduced, the air close to the outer surface of the gas output pipeline is used for conducting heat to the gas output pipeline, the density of the air is increased after the temperature of the air is reduced, the cold air flows downwards along the surface of the flow stabilizing portion under the action of gravity, the vortex or turbulence generated by the cold air under the bottom surface of the flow stabilizing portion is relatively small, so that the retention of cold air under the bottom surface of the gas output pipeline can be reduced; and heat can be transferred to the fuel gas output pipeline more quickly, so that frost condensed on the surface of the fuel gas output pipeline is reduced, and therefore the heat conduction of the hot air to the fuel gas output pipeline is accelerated, and a virtuous cycle is formed.

Description

technical field [0001] The invention relates to a liquid natural gas storage tank, in particular to a gas output pipeline of the liquid natural gas storage tank. Background technique [0002] The liquid natural gas storage tank is referred to as the LNG storage tank. It is a double-layer structure. There is a vacuum between the inner tank and the outer layer. [0003] In the existing technology, such as figure 1 and figure 2 As shown, the liquid natural gas storage tank 1 is surrounded by a gas outlet pipe assembly. The gas outlet pipe assembly includes a horizontally arranged gas outlet pipe 2 and an upper outlet pipe 3. Both the gas outlet pipe 2 and the upper outlet pipe 3 have disconnected gaps. It is circular and arranged around the liquid natural gas storage tank 1; the gas output pipe 2 and the upper output pipe 3 are connected through a transition pipe 4, and the transition pipe 4 is vertically arranged, and the transition pipe 4 has multiple and surrounds the liq...

AI Technical Summary

Problems solved by technology

[0010] Through the above technical solution, the gas output pipeline conducts heat to the liquid natural gas inside it, and the liquid natural gas is heated and vaporized to absorb heat, the temperature of the gas transmission pipeline decreases, and the air near the outer surface of the gas output pipeline conducts heat to the gas output pipeline, After the air temperature drops, the density increases, and the cold air flows downward along the surface of the steady flow part under the action of gravity. The vortex or turbulence generated by the cold air under the bottom surface of the steady flow part is relatively small, which can reduce the cold air below the bottom surface of the gas output pipe. The hot air can conduct heat to the gas output pipe faster, reduce the frost condensed on the surface of the gas output pipe, and then accelerate the heat conduction of the hot air to the gas output pipe, forming a virtuous cycle; the liquid natural gas inside the gas output pipe can be released in time Improve the problem that the increase of liquid natural gas cannot be vaporized in the gas output pipeline after it is filled with gas output pipeline

Images