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Filling system of pressure differential liquefied natural gas filling station and method thereof

A technology of liquefied natural gas and filling system, which is applied in the field of liquefied natural gas filling facilities, can solve the problems of long time liquefied natural gas, increased BOG generation, easy generation of more BOG, etc., and achieves low daily operation cost and BOG generation. volume reduction, the effect of reducing flash steam

Inactive Publication Date: 2014-11-26
陈恳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] BOG (Boil Off Gas) flash steam produces a relatively large amount, especially for sites that have just been put into operation. Since there are fewer gas-filled vehicles, the time required for storage tanks to store LNG (Liquefied Natural Gas) liquefied natural gas is relatively long, and it is easy to generate More BOG, in addition to economic losses, and LNG temperature to a certain level from the point of view of safety can no longer be used, need to deal with BOG;
[0005] The key components of the cryogenic submersible pump skid system in the equipment: cryogenic submersible pumps generally adopt imported products, and the initial investment cost and maintenance cost including accessories and repairs are very considerable; and the current gas filling station operates every time Before refueling natural gas-powered vehicles, it is necessary to run the low-temperature submersible pump to circulate LNG in advance to pre-cool the entire system. The high-temperature liquid in the on-site pipeline system must be replaced before refueling, which increases the BOG. Production volume, higher operating costs

Method used

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  • Filling system of pressure differential liquefied natural gas filling station and method thereof
  • Filling system of pressure differential liquefied natural gas filling station and method thereof
  • Filling system of pressure differential liquefied natural gas filling station and method thereof

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Embodiment 1

[0037] Such as figure 2 The pressure differential LNG refueling station filling system shown includes storage tank system 1, unloading system 2, gas filling system 4 and valve components, and unloading system 2 is installed on storage tank system 1 and the tank car of the gas filling station 5; the gas filling system 4 is set between the storage tank system 1 and the gas vehicle 6 to be filled.

[0038] The valve assembly includes the valves on both sides of the unloading carburetor 9, the pneumatic valve 17 of the upper liquid inlet pipe, the pneumatic valve 18 of the lower liquid inlet pipe, the pneumatic valve 19 of the liquid outlet pipe, the pneumatic valve 20 of the air return pipe, and the pneumatic valves on the front and rear sides of the booster carburetor 10 ,in:

[0039] The tank car 5 is provided with an unloading port 21, a gas phase port 22 and a booster port 23, an unloading carburetor 9 is arranged between the gas phase port 22 and the booster port 23, and a f...

Embodiment 2

[0053] Such as image 3 As shown in the filling system of the differential pressure liquefied natural gas filling station, the storage tank system 1 of this embodiment adds a storage tank on the basis of embodiment 1, that is, two storage tanks (storage tank A7 or storage tank B8), one of them is used as a filling tank, and the other is used as a gas return tank for a gas cylinder of a gas vehicle. At the same time, the two tanks can be switched. When the storage tank A7 is used as a filling tank, the storage tank B8 is used as a return tank. Gas storage tank, after the LNG in storage tank A7 is filled, the system is converted to storage tank B8 for filling, and storage tank A7 is converted to a gas return tank; it is guaranteed that LNG fuel can be filled while unloading, without affecting daily operations .

[0054] At this time, a booster carburetor 10 is arranged between the storage tank A7 and the storage tank B8, and two sets of pneumatic valve groups are respectively a...

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Abstract

The invention provides a filling system of a pressure differential liquefied natural gas filling station and a method thereof. The filling system comprises a storage tank system, an unloading system, a gas filling system and valve assemblies; the unloading system is arranged between the storage tank system and the tank car of the gas filling station; the gas filling system is arranged between the storage tank system and a gas vehicle to be filled with gas; the valve assembly is arranged in the unloading system, and the unloading system and the storage tank system are connected by use of the valve assembly; the valve assembly is arranged in the storage tank system, and the storage tank system is connected with the gas filling system by use of the valve assembly. The gas vehicles are filled with the liquefied natural gas in a pressure differential manner, and as a result, under the premise that a skid-mounted pump system is omitted, the generation of boil off gas (BOG) is reduced, and the economic efficiency and the environmental protection property are obviously improved.

Description

technical field [0001] The invention relates to a gas filling facility for liquefied natural gas, in particular to a filling system and method for a pressure difference type liquefied natural gas filling station. Background technique [0002] The liquefied natural gas refueling station is a special place for refilling liquefied natural gas fuel for gas storage cylinders of gas vehicles. The gas filling equipment currently used in the gas filling station mainly includes the unloading system, the cryogenic submersible pump skid system, the storage tank system, the gas filling system, and the control system including the station control system, station management system and IC card management system. Its whole process is as figure 1 As shown, the unloading process is divided into "LNG liquid in the tank car → unloading system → cryogenic submersible pump skid system (start pump) → storage tank system" in the pumping mode or "LNG liquid in the tank car → unloading system" in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C5/00F17D1/04F17D3/01
Inventor 陈影
Owner 陈恳
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