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Small natural gas liquefying technology

A natural gas, small-scale technology, applied in the field of liquefaction process, can solve the problems of complicated process, long driving time, inconvenient maintenance, etc., and achieve the effect of simple process flow, stable operation of the device, and convenient start and stop

Active Publication Date: 2015-09-16
XINDI ENERGY ENG TECH
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the cascade refrigeration process has many units, the process is complicated, and maintenance is inconvenient. The mixed refrigerant refrigeration process is favored by medium-sized LNG plants, but there are problems such as difficult matching of mixed refrigerants and long start-up time. The throttling refrigeration process Although the efficiency is low, the process is the simplest, there is no problem with the ratio of mixed refrigerants, it is more convenient to start and stop, and the investment is less. This process can be used for small natural gas liquefaction plants

Method used

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Embodiment Construction

[0039] The invention proposes a small-scale natural gas liquefaction process, which uses the principle of high-pressure natural gas precooling and throttling refrigeration for liquefaction, the process flow is simple, and there is no problem of refrigerant ratio; The nitrogen content is removed to the qualified standard. Its technological process is:

[0040] Refer to attached figure 1 , showing a liquefaction process for purified natural gas with a nitrogen content > 1 volume %, the purified natural gas is pressurized to 10-25 MPa through the purified gas compressor C-1, and cooled in the compressor aftercooler E-1 to about 30-45°C, such as 40-45°C, the high-pressure purified natural gas is firstly pre-cooled to 0-20°C in the first heat exchanger E-2, and then cooled to -15--40°C in the refrigerator E-3 ℃, and then enter the second heat exchanger E-4, where it is cooled to -100~-130℃, and the natural gas is liquefied by using the principle of precooling first and then high-...

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Abstract

The invention relates to a small natural gas liquefying technology or device. The technology is characterized in that purified natural gas is pressurized and liquefied through the technology that the high-pressure natural gas is refrigerated in advance and then refrigerated in a throttling mode, the refrigerating capacity for refrigerating the high-pressure natural gas in advance is provided by a single refrigerant provided by a refrigerating machine and part of LNG generated through liquefying of the natural gas, the technology process is simple, the problem of the ratio of the refrigerant does not exit, the device runs stably, and a machine can be started and stopped conveniently; furthermore, the nitrogen content in the LNG can be removed and reduced to be 1% or lower through a throttling flash approach.

Description

technical field [0001] The invention provides a small-scale natural gas liquefaction process, which is suitable for reliquefaction of BOG produced by LNG storage tanks and LNG loading and unloading systems. Background technique [0002] Under the pressure of environmental protection and energy cost, the proportion of natural gas as primary energy in various fields of society is gradually increasing, and its application fields have gradually expanded to power generation, automobile gas, industrial gas, urban residential gas, chemical gas, etc. , the market demand is increasing rapidly. The traditional natural gas pipeline supply method is still the mainstream, but due to the limitations of raw material conditions and user distribution, a considerable part of resources cannot be transported by pipelines for long distances. It is necessary to choose the liquefaction method to convert methane into liquid and then use flexible transportation methods to transport it. sent to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/004F25J1/0045F25J1/0052F25J1/0087F25J1/0097F25J2270/90F25J1/0208F25J2220/62
Inventor 何振勇张生郑忠英韩金潮傅建青寇伟伟刘恒马洪燕邵东方
Owner XINDI ENERGY ENG TECH
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