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Natural gas high-efficiency liquefaction recovery method and device

A recovery method and technology of natural gas, which is applied in the field of low-temperature storage and transportation of natural gas, can solve problems such as complex operation and huge heat exchanger area, and achieve continuous recovery and low equipment investment costs

Active Publication Date: 2018-03-27
WUXI CHINA RESOURCES GAS
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  • Abstract
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  • Application Information

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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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  • Natural gas high-efficiency liquefaction recovery method and device

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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 natural gas high-efficiency liquefaction recovery method and device. This method utilizes the differences in boiling point, freezing point, and saturation temperature and pressure between liquid nitrogen and natural gas to pass natural gas directly into a low-temperature container filled with liquid nitrogen, and in the same low-temperature container, the natural gas and liquid nitrogen are directly mixed and liquefied into LNG, control the saturation pressure of the liquid in the cryogenic container, so that the natural gas does not freeze and freeze, and can effectively separate LNG from liquid nitrogen. The biggest advantage of the invention is that the equipment investment cost is low, and it does not affect the normal use of LNG. It can be widely used in the liquefaction of micro and small gas sources, and is especially suitable for BOG recovery of LNG gas filling.

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 Patents(China)
IPC IPC(8): F25J1/02F25J3/00F17C5/04
CPCF25J1/0022F25J1/0025F25J1/004F25J1/0221F25J1/0244F25J2205/90F25J2210/42
Inventor 刘印同张磊吴楠赵海峰杨越
Owner WUXI CHINA RESOURCES GAS
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