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Anti-freezing LNG (Liquefied Natural Gas) heat exchange method and anti-freezing LNG heat exchange device

A heat exchange device and anti-freezing technology, which is applied in the direction of indirect heat exchangers, heat exchanger shells, heat exchange equipment, etc., can solve problems such as condensation and large selection of conventional heat exchange media, and achieve broad application prospects and save equipment Cost and power consumption, the effect of avoiding freezing and freezing

Active Publication Date: 2014-12-17
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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  • Anti-freezing LNG (Liquefied Natural Gas) heat exchange method and anti-freezing LNG heat exchange device

Examples

Experimental program
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Effect test

Embodiment 1

[0026]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. The low-temperature LNG at -162°C passes through the wall of the LNG gasification section 11 and C3C4 gas After heat exchange, 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 2bar, 25°C, 950kg / h water of the shell 3, and heats up to -10°C to enter the tube box 4, and 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...

Embodiment 2

[0028] 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. The low-temperature LNG at -162°C passes through the wall of the LNG gasification section 11 and C3C4 gas After heat exchange, it will be heated and gasified into -70°C gaseous natural gas, and then enter 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 the temperature will rise to -10°C enters the upper part of the pipe 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...

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Abstract

The invention discloses an anti-freezing LNG (Liquefied Natural Gas) heat exchange method and an anti-freezing LNG heat exchange device. The device is a U-shaped tubular heat exchanger and is characterized by comprising a U-shaped tube, a sleeve, a tube tank, a longitudinal baffle, a pass partition and a shell, wherein the U-shaped tube consists of an LNG gasification section and an NG heating section; the LNG gasification section is of a sleeve structure; the NG heating section is of a single-tube structure; the interior of the tube is provided with a low-temperature gaseous natural gas passage; an intermediate coolant is a C3C4 mixture; the C3C4 mixture is used for continuously performing gas-liquid phase change circulation so as to realize an efficient indirect heat exchange process between LNG and a common heat exchange medium. The heat exchange device disclosed by the invention is compact in structure, low in cost, high in heat exchange efficiency and safe and stable in operation, and can be used for effectively solving the problem of freezing blockage generated during heat exchange of the common heat exchange medium and LNG; by virtue of self boiling and condensation of the C3C4 mixture, automatic circulative flowing of the C3C4 mixture is realized and extra power equipment is not needed, so that the equipment cost and the energy consumption are reduced, and the application prospect is favorable.

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 Applications(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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