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Multi-flow spiral winding tube type main heat exchange equipment with mixed refrigerant for low-temperature liquefaction of LNG (liquefied natural gas)

A mixed refrigerant and spiral winding technology, applied in liquefaction, indirect heat exchangers, heat exchanger types, etc., can solve problems such as low heat transfer efficiency, small temperature difference, and large volume

Inactive Publication Date: 2012-07-11
张周卫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because ordinary tube-and-tube heat exchangers adopt the tube-sheet connection parallel tube bundle method, the structure is simple, and the self-shrinking ability is poor. Generally, the heat exchange is performed by a single flow, the heat exchange efficiency is low, the volume is large, and the temperature difference is small. Cool and liquefy natural gas in one process

Method used

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  • Multi-flow spiral winding tube type main heat exchange equipment with mixed refrigerant for low-temperature liquefaction of LNG (liquefied natural gas)
  • Multi-flow spiral winding tube type main heat exchange equipment with mixed refrigerant for low-temperature liquefaction of LNG (liquefied natural gas)

Examples

Experimental program
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Embodiment Construction

[0017] 36°C, 0.9MPa C4H separated from the mid-stage condensation of the mixed refrigerant compressor 10 — Different C 4 h 10 The mixed refrigerant enters the inlet 27 and is then distributed in C 4 h 10 — Different C 4 h 10 C 4 h 10 — Different C 4 h 10 、C 3 h 8 , N 2 —CH 4 —C 2 h 4 The mixed gas is supercooled, the temperature drops to -53°C, the pressure drops to 0.6MPa, and then flows to the outlet 18, and is throttled by the throttle valve installed between the outlet 18 and the inlet 17 to become a supercooled liquid. After throttling, the pressure drop to 0.3MPa, the temperature becomes -52.85°C, and then enters the cylinder 35 through the inlet 17, and the throttled C 3 h 8 , N 2 —CH 4 —C 2 h4 The mixed gas is mixed, and after mixing, it flows downward to cool the natural gas tube bundle 32, N 2 —CH 4 —C 2 h 4 Tube bundle 25, C 3 h 8 Tube bundle 33, C 4 h 10 — Different C 4 h 10 After the tube bundle 24, at 26°C and 0.3 MPa, it flows out o...

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Abstract

The invention belongs to the technical field of low-temperature liquefaction of natural gas, and relates to multi-flow spiral winding tube type main heat exchange equipment with mixed refrigerant for low-temperature liquefaction of LNG (liquefied natural gas) and refrigerating technology of mixed refrigerant. Natural gas at the temperature of 36 DEG C and pressure of 6.1MPa is gradually cooled to the temperature of minus 164 DEG C and is overcooled by the aid of mixed refrigerant consisting of N2, CH4, C2H4, C3H8, C4H10 and isomerized C4H10 via a three-stage refrigerating process, the N2, the CH4, the C2H4, the C3H8, the C4H10 and the isomerized C4H10 are gradually overcooled by a multi-flow spiral winding type heat exchanger and are respectively throttled, a natural gas tube bundle and a mixed refrigerant tube bundle are pre-cooled, and purposes of primary precooling of the natural gas, secondary liquefaction of the natural gas and tertiary overcooling of the natural gas are achieved. The multi-flow spiral winding tube type main heat exchange equipment is compact in structure and high in heat exchange efficiency, and can be used for the field of phase-change low-temperature heat exchange of gas at the temperature ranging from 36 DEG C to minus 164 DEG C, technical difficult problems in terms of low-temperature liquefaction of the LNG are solved, and low-temperature heat exchange efficiency of an LNG system is improved.

Description

technical field [0001] The invention belongs to the technical field of low-temperature liquefaction of natural gas, and relates to a multi-stream spiral-wound tube-type main heat exchanger of LNG low-temperature liquefaction mixed refrigerant and a mixed refrigerant refrigeration technology. 2 、CH 4 、C 2 h 4 、C 3 h 8 、C 4 h 10 , different C 4 h 10 The mixed refrigerant gradually cools the 36°C, 6.1MPa natural gas in the multi-stream spiral wound tube heat exchanger through a three-stage refrigeration process to -164°C to be liquefied and supercooled; cold N 2 、CH 4 、C 2 h 4 、C 3 h 8 、C 4 h 10 , different C 4 h 10 , and then throttling and precooling natural gas tube bundles and mixed refrigerant tube bundles respectively, to achieve the purpose of first-level natural gas precooling, second-level natural gas liquefaction and third-level natural gas supercooling; it has a compact structure and high heat exchange efficiency, and can be used at 36 ° C ~ - In t...

Claims

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Application Information

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IPC IPC(8): F25J1/02F28D7/02
Inventor 张周卫汪雅红张小卫庞凤皎吴金群彭光前杨智超张鹏
Owner 张周卫
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