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Method for recovering tank car unloading gas and storage tank flash stream of LNG (liquefied natural gas) automobile gas station

A technology of unloading gas and flash gas, which is applied in the container discharge method, container filling method, fixed-capacity gas storage tank, etc., can solve the problems of waste safety, hidden dangers, etc., and achieve the goal of improving safety, reliability and stability Effect

Inactive Publication Date: 2015-03-25
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process flow of the existing LNG vehicle refueling station, most of the flash gas of the LNG storage tank is directly released or processed by torch combustion, which will cause waste and safety hazards

Method used

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  • Method for recovering tank car unloading gas and storage tank flash stream of LNG (liquefied natural gas) automobile gas station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] As attached figure 1 As shown, the specific operation steps of the present invention are as follows:

[0025] (2) When the unloading process starts, close the shutoff valve of the main pipe to connect the liquid phase and gas phase of the LNG tanker and the LNG storage tank for unloading. After the LNG unloading process is completed, when the gas phase pressure of the LNG tanker is 0.6-0.8MPa When, open the stop valve on the main pipe and the pressure regulating valve of the unloading gas pipeline, and close the pressure regulating valve of the flash steam pipeline;

[0026] (3) The unloading gas uses its own pressure to pass through the stop valve and the one-way check valve along the pipeline, enters the air-heated heater or the water bath electric heater, and enters the buffer tank after being heated by the heater. After the unloading gas comes out of the buffer tank After going through the pipeline through the primary pressure reducing valve for pressure reduction, it e...

Embodiment 2

[0038] When it is cold in winter when the temperature is less than 10℃, close the shut-off valve 8 in front of the air temperature heater 10, open the shut-off valve 9 in front of the water bath electric heater 11, and let the unloading gas enter the buffer after being heated by the water bath electric heater 11 Tank 12 avoids frosting of pipes due to low temperature in winter in the north. The rest is the same as in Example 1.

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Abstract

The invention provides a method for recovering unloading gas of a natural gas tank car and flash stream of a natural gas storage tank. The method comprises the following steps: when the gas phase pressure of an LNG (liquefied natural gas) tank car is 0.6-0.8 MPa, a pressure regulating valve is opened; unloading gas utilizes the self pressure to enter an air heater or a water-bath type electric heater; the unloading gas heated by the heater sequentially enters a buffer tank and a gas storage tank; after the pressure of the unloading gas is reduced by a secondary dropping valve to be a pressure required by a user, the pressure of the unloading gas is metered by a meter; finally, an odorizing device odorizes the unloading gas and then feeds the unloading gas to a station; when the gas phase pressure of the LNG tank car is reduced to 0.3 MPa, the pressure regulating valve is closed. The method for recovering the unloading gas of the natural gas tank car and the flash stream of the natural gas storage tank has the advantages of no waste of natural gas, safety and convenience.

Description

Technical field [0001] The invention relates to a method for recovering LNG vehicle refueling station tank truck unloading gas and storage tank flash gas for self-use gas in a station. Background technique [0002] Natural gas is a clean and efficient energy source. With the use of liquefied natural gas (LNG) as a vehicle power technology, the number of LNG vehicle filling stations in my country has developed rapidly in recent years. LNG vehicle filling stations generally use full-pressure LNG storage tanks for gas storage and filling. The current LNG unloading process mainly includes a booster unloading process, a pump unloading process and a pump + booster combined unloading process. Regardless of the unloading process, gaseous natural gas will inevitably remain in the tanker after the LNG unloading is completed. The pressure of the residual natural gas is generally 0.6-0.8MPa, which is equivalent to about 140m in the standard state. 3 . Under normal circumstances, this part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/02F17C13/00F17D1/02
Inventor 赵亚平景奇佳乔海星李峰张志超
Owner SEDIN ENG
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