Mixed heating LNG gasifier

Abstract

The invention provides a mixed heating LNG gasifier. The mixed heating LNG gasifier is composed of a hot water distributor, a finned tube, an LNG distribution tank, an NG gas collecting tank and the like. The hot water distributor comprises a hot water distribution box, a water inlet pipe, a hot water tank, a convex overflow plate, a cylindrical buffer, a buffer cover plate, a distribution plugboard, a trough type channel, an overflow plugboard and a drainage board, wherein the hot water tank is divided into a buffer area, a distribution area, an overflow area and a heat exchange area by the distribution plugboard and the overflow plugboard, the non-communication of the buffer area and the heat exchange area ensures that the hot water in the heat exchange area is in a stable state, so thathot water forms a uniformly-distributed hot water solution film on the outer surface of the finned tube through a flow guide plate. When the temperature in the daytime is high, the LNG is heated by taking air as a heat source. When the temperature at night is low, the LNG is heated by utilizing plant hot water, so that the gasification efficiency of LNG is improved.

Description

technical field [0001] The invention belongs to the technical field of gas equipment, and relates to a mixed heating LNG vaporizer. Background technique [0002] Liquefied Natural Gas (LNG for short) is known as a high-quality clean fuel because of its high calorific value, good burnout, and low environmental pollution from combustion products. It is a liquid mixture mainly composed of methane. The storage space is about 1 / 600 of the gaseous natural gas (Natural Gas, NG for short) under the same mass standard condition, which greatly saves storage space and is convenient for transportation. The air-heated gasifier is the most common type of gasifier at present. Air is used as the heat exchange medium to heat low-temperature LNG. The heat exchange tube adopts a star-shaped finned tube structure, and the fins are evenly distributed. It has been widely used because of its simple working principle, low operation and maintenance costs, and stable operation. When it is necessary...

AI Technical Summary

Problems solved by technology

[0003] Compared with other forms of gasifiers, air-heated gasifiers are easily affected by the external environment. The temperature difference between day and night in Northwest my country exceeds 15°C, and the days are short and the nights are long in winter, which greatly reduces the heat transfer efficiency of the gasifier. , so that the outlet temperature of gaseous natural gas is lowered or even incompletely gasified, which reduces the amount of gasification

When the gasification process of LNG in the air-temperature gasifier is not complete, the coupling effect of the gas-liquid two-phase fluid in the pipe will cause the pipe to vibrate, and then the gas-liquid two-phase flow pipe will become a self-excited vibration system, resulting in gasification Vibration in the finned tube of the gasifier, the instability of the vibration seriously affects the heat transfer performance of the gasifier, affects the safe and efficient operation of the gas pipeline, and even causes accidents, affecting personal and property safety

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