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Method and device for liquefying natural gas via refrigeration of single mixed refrigerant

A technology of liquefied natural gas and mixed working fluid, which is applied in refrigeration and liquefaction, liquefaction, refrigerator and other directions, can solve the problems of high energy consumption of the device and poor adaptability to variable load operation, so as to reduce power consumption and increase equipment investment. , the effect of reducing the degree of influence

Inactive Publication Date: 2011-02-09
HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

The heat exchange process between refrigerant and natural gas in the plate-fin heat exchanger is a first-stage heat exchange, the optimization of the heat exchange temperature difference between the streams is limited to a certain extent, the energy consumption of the device is relatively high, and in addition, there is no significant impact on the variable load operation of the device. good adaptability

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  • Method and device for liquefying natural gas via refrigeration of single mixed refrigerant
  • Method and device for liquefying natural gas via refrigeration of single mixed refrigerant
  • Method and device for liquefying natural gas via refrigeration of single mixed refrigerant

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Embodiment Construction

[0028] Further explain below in conjunction with accompanying drawing:

[0029] Such as figure 2 As shown, the purified raw natural gas first enters the first-stage plate-fin heat exchanger 51 and is pre-cooled to -20 to -40°C; then continues to enter the second-stage plate-fin heat exchanger 52 and is cooled to -50 to After -60°C, it enters the heavy hydrocarbon separator 72 for gas-liquid separation, and the gas phase stream separated from the top of the heavy hydrocarbon separator 72 continues to enter the secondary heat exchanger 52 until it is cooled to -80~-100°C; stage plate-fin heat exchanger 53, in which it is subcooled to -145~-165°C, and the subcooled liquefied natural gas stream is throttled by the throttle valve 63 to obtain LNG products, and sent to the LNG storage tank 8 store.

[0030] Mixed refrigerant cycle:

[0031] The mixed working medium composed of C1~C5 and N2 enters the inlet of compressor 1 after a reasonable ratio, is compressed to 0.6~1MPa for a s...

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Abstract

The invention relates to a device for liquefying natural gas via the refrigeration of a single mixed refrigerant, comprising a motor-driven three-section mixed refrigerant compressor, three coolers, five gas-liquid separators, two liquid pumps, three throttling devices, three fin-type heat exchangers and one LNG (Liquefied Natural Gas) storage tank. According the device, the mixed refrigerant is compressed and separated step by step by using the three-section mixed refrigeration compressor, and the liquid separated in each step is pressurized by the liquid pumps and then directly enters the heat exchanger group for heat exchange, thereby reducing the power consumption of gas compression; the three-stage refrigeration cycle is adopted to ensure that the heat exchange curves of the cold fluid and the hot fluid in the whole heat exchange process are better matched, therefore, the flow of the mixed refrigerant is effectively decreased and the energy consumption of the device is finally reduced.

Description

technical field [0001] The invention belongs to the liquefaction production of other hydrocarbon-rich gases, and in particular relates to a method and device for liquefying natural gas by using single mixed working medium refrigeration. technical background [0002] Due to its environmental protection, natural gas has become the best substance to replace other fuels, and its application fields have gradually expanded to power generation, automobile gas, industrial gas, urban residential gas, chemical gas, etc. [0003] With the growth of natural gas consumption, as one of the most efficient forms of supply and use of natural gas, the trade volume of liquefied natural gas has become one of the fastest growing areas of the energy market. The continuous development of the liquefied natural gas industry has put forward higher requirements for natural gas liquefaction methods and devices in terms of energy consumption, investment and efficiency. [0004] At present, relatively m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/10C10L3/10
CPCF25J1/0022F25J1/0055F25J1/0212F25J1/0291F25J2220/64
Inventor 葛水福杨雪婷阮家林汪孔奋向云华陶利民李鹏葛浩俊葛浩华任智军陈坤远蒋吉林
Owner HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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