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A kind of anti-freeze lng heat exchange method and device

A thermal method, anti-freezing technology, applied in indirect heat exchangers, heat exchanger shells, heat exchange equipment, etc., can solve the problems of condensation, large selection of conventional heat exchange media, etc., to achieve broad application prospects and save equipment costs and power consumption, small footprint

Active Publication Date: 2016-06-22
佛山市寰晟通新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problem of condensation occurring when the conventional heat exchange medium exchanges heat with LNG, and the conventional heat exchange medium has large selection, low cost, high heat exchange efficiency, and safe and stable operation

Method used

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  • A kind of anti-freeze lng heat exchange method and device

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Experimental program
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Embodiment 1

[0025]In this embodiment, LNG at 2 bar, -162°C, and 100 kg / h is used as the gasification task, and water at 2 bar, 25° C., and 950 kg / h is used as the conventional heat exchange medium. 2bar, -162°C, 100kg / h LNG enters the lower part of the pipe box 4 from the LNG inlet 5, and then enters the LNG gasification section 11 at the lower part of the heat exchanger. After heating, the temperature rises and gasifies into gaseous natural gas at -70°C, and then enters the NG heating section 12 on the upper part of the heat exchanger to exchange heat with 2bar, 25°C, 950kg / h water in the shell 3, and heats up to -10°C to enter the tube box 4 The upper part flows out from the natural gas outlet 6 to complete the gasification process; the C3C4 mixture gas in the annulus of the casing 2 exchanges heat with the LNG in the LNG gasification section 11 to cool down and condenses into a C3C4 mixture liquid, which drops to the bottom of the annulus. Then through the outer tube wall of the casing...

Embodiment 2

[0027] In this example, LNG at 2 bar, -162°C, and 100 kg / h is used as the gasification task, and 30% ethylene glycol aqueous solution at 2 bar, 25°C, and 850 kg / h is used as the conventional heat exchange medium. 2bar, -162°C, 100kg / h LNG enters the lower part of the pipe box 4 from the LNG inlet 5, and then enters the LNG gasification section 11 at the lower part of the heat exchanger. After heating, the temperature rises to gaseous natural gas at -70°C, and then enters the NG heating section 12 on the upper part of the heat exchanger to exchange heat with the 30% ethylene glycol aqueous solution of 2bar, 25°C, 850kg / h in the shell 3, and heats up to - 10°C enters the upper part of the tube box 4, and flows out from the natural gas outlet 6 to complete the gasification process; the C3C4 gas in the annular gap of the casing 2 exchanges heat with the LNG in the LNG gasification section 11 to cool down and condenses into a C3C4 liquid, and drops to the ring The bottom of the gap...

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Abstract

The invention discloses an anti-freezing LNG heat exchange method and device. The device is a U-shaped tube heat exchanger, and the device is a U-shaped tube heat exchanger. , tube box, longitudinal baffle, splitter plate and shell. The U-shaped tube is composed of an LNG gasification section and an NG heating section. The LNG gasification section is a casing structure; the NG heating section is a single-tube structure, and the tube is a low-temperature gaseous natural gas circulation channel. The intermediate refrigerant is a C3C4 mixture, and the C3C4 mixture is used to continuously carry out the gas-liquid phase change cycle to realize the efficient indirect heat exchange process between LNG and conventional heat exchange media. The heat exchanger of the present invention has the advantages of compact structure, low cost, high heat exchange efficiency, safe and stable operation, and can effectively solve the problem of freezing blockage during heat exchange between conventional heat exchange medium and LNG, and the C3C4 mixture realizes automatic heating and cooling through its own boiling and condensation. Circulating flow does not require additional power equipment, saving equipment cost and energy consumption. It has a good application prospect.

Description

technical field [0001] The invention relates to the field of heat exchange gasification of liquefied natural gas, in particular to an anti-freezing LNG heat exchange method and device. Background technique [0002] Since my country's coastal areas began to import and use liquefied natural gas (LNG), a clean energy source, in 2006, my country's LNG market has developed rapidly. In 2012, my country's annual LNG import volume was about 15 million tons. Before LNG is supplied to users, it needs to be converted into gaseous natural gas (abbreviated as NG) through heat exchange and gasification. Since LNG is a low-temperature liquid at about -162°C, some conventional refrigerants such as brine, ethylene glycol aqueous solution, and ammonia gas have freezing points. Higher, if it exchanges heat with LNG, it will freeze due to local supercooling, and the ice layer will tend to thicken as time goes on, which will deteriorate the heat transfer performance of the heat exchange device, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D15/02F28F9/22
Inventor 徐文东赵建河许欢欢潘季荣
Owner 佛山市寰晟通新能源科技有限公司
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