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Method and device for efficiently liquefying and recovering natural gas

A recovery method and technology for natural gas, applied in the field of low-temperature storage and transportation of natural gas, can solve the problems of complicated operation and huge heat exchanger area, and achieve the effect of continuous recovery and low equipment investment cost.

Active Publication Date: 2016-03-09
WUXI CHINA RESOURCES GAS
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, liquid nitrogen heat exchangers are also used to liquefy and recover natural gas, but the area of ​​the heat exchanger is huge, special cryogenic container equipment is required, and the operation is complicated and has not been accepted by the market.

Method used

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  • Method and device for efficiently liquefying and recovering natural gas

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the examples, but the present examples do not constitute any limitation to the present invention.

[0029] In this embodiment, the BOG recovery of the LNG storage tank of the LNG filling station is used for illustration.

[0030] see figure 1 , the cryogenic container in this embodiment is a special 450L cryogenic gas cylinder 1, which is filled with liquid nitrogen of about 0.3mpa with a volume of 90% before being put in; Above, the natural gas inlet end of the tube side of the natural gas precooling heat exchanger 4 is equipped with an inlet valve 9 and an inlet pressure detection instrument 5; the natural gas input pipeline 3 is introduced into the low-temperature gas cylinder 1, and the outlet end of the natural gas extends to the low-temperature gas cylinder. The bottom layer of liquid nitrogen in bottle 1;

[0031] A nitrogen exhaust pipe 2 is connected between the shell side of the natura...

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Abstract

The invention relates to a method and a device for efficiently liquefying and recovering natural gas. The method is characterized in that liquid nitrogen and natural gas are different in boiling point, freezing point, saturation temperature and pressure, and on that basis, natural gas can be directly charged into a cryogenic vessel which is filled with liquid nitrogen; the natural gas and the liquid nitrogen in the same cryogenic vessel are directly mixed, exchange heat and then are liquefied to obtain LNG (Liquefied Natural Gas); the saturation pressure of liquid in the cryogenic vessel is controlled to prevent the natural gas from solidifying and icing as well as effectively separating the LNG and the liquid nitrogen. The method and the device have the main advantages that equipment investment cost is low, and the LNG can be normally used; the method and the device can be widely applied to the liquefaction of a micro gas source, and particularly suitable for BOG recovering during LNG refilling.

Description

technical field [0001] The invention relates to low-temperature storage and transportation of natural gas, in particular to a high-efficiency liquefaction recovery method and device for natural gas. Background technique [0002] At present, there are two main methods of production, storage and transportation of natural gas: one is the gas method, which is stored under high pressure by pressurization and transported by vehicles or pipelines; the other is to liquefy natural gas to greatly reduce the storage volume. The gas vehicle method takes up too much volume and is inconvenient to transport. The gas pipeline method must have a sufficient quantity and a stable gas source to be possible. The liquid method also requires a certain sufficient gas source, which is complex in technology and huge in investment costs. For the continuous or discontinuous small and bulk natural gas sources that exist or are generated during production, storage and use, they cannot be recovered and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02F25J3/00F17C5/04
CPCF25J1/0022F25J1/0025F25J1/004F25J1/0221F25J1/0244F25J2205/90F25J2210/42F25J1/02F17C5/04F25J3/00
Inventor 刘印同张磊
Owner WUXI CHINA RESOURCES GAS
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