Liquefied natural gas twin-pump gas station

A technology of liquefied natural gas and gas filling stations, which is applied in the direction of gas/liquid distribution and storage, equipment loaded into pressure vessels, and methods of container discharge. Simultaneous flow of liquid, LNG stratification and tumbling danger, etc., to eliminate the phenomenon of stratification and tumbling, facilitate automatic control, and have good cold preservation effect

Inactive Publication Date: 2015-03-18
沈军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing liquid natural gas (also known as LNG, this article includes liquid coalbed methane, liquid shale gas, etc.) double-pump gas station, the two pumps are used as one on and one on standby, which can be divided into two situations, one is: the existing one Gas filling station with two tanks and two pumps, limited by the process pipeline, cannot transition from a gas filling station with one tank and two pumps to a gas filling station with two tanks and two pumps. It is obviously not economical to go up from the secondary station unless the pipeline is removed and rebuilt; the second is: the existing two-tank double-pump gas filling station has complicated process pipelines and low pump efficiency, which cannot The function of unloading and filling at the same time is realized, and the function of two storage tanks taking turns to use up the LNG in their respective storage tanks cannot be realized. Due to the inconsistent temperature and density of LNG, the LNG in the storage tanks is in danger of stratification and rollover.

Method used

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  • Liquefied natural gas twin-pump gas station

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] Example 1: There is no LNG liquid in the storage tank 41, but there is LNG liquid in the storage tank 42.

[0077] A pump 45 starts the unloading process to fill a storage tank 41 with liquid, and a pump 46 starts the liquid filling process to use the LNG in the other storage tank 42 to add liquid to the outside through the gas dispenser, and they are carried out simultaneously;

[0078] figure 1 Indicates the LNG double-pump filling station:

[0079] exist figure 1 middle,

[0080] There is no LNG liquid in the storage tank 41, and there is LNG liquid in the storage tank 42. Add liquid to the storage tank 41. Obviously, there is no LNG layering and rolling phenomenon in the storage tank 41. The two tanks are used separately, and recycling is a technical feature of this case. , which cannot be achieved by existing technologies. This is a very large technological advance that is not obvious from the existing technology.

[0081] Use the pump 45 to unload the liquid ...

example 2

[0085] Example 2: Two pumps correspond to one storage tank 42 at the same time, and the LNG in the storage tank is used up as soon as possible.

[0086] figure 1 Indicates the LNG double-pump filling station:

[0087] exist figure 1 middle,

[0088] Above-mentioned example one, storage tank 41 is filled with LNG, and this liquid is cold liquid, and pressure is low, can store several days, now concentrates two pumps to use up LNG in the storage tank 42 for external addition.

[0089] Close valves 1, 2, 3, 4, 5, and 6 under the storage tank 41;

[0090] Open two pumps 45,46 air return port valves and the gas phase valve of storage tank 42 i.e. 32,33,34,11;

[0091] Open the liquid outlet valve 9 of the storage tank 42 and enter the pump 45 through the opening of the valves 31 and 37, the pump 45 is started, the valve 20 is closed, the valves 26 and 21 are opened, and the liquid enters the gas dispenser through the valve 15 to add liquid;

[0092] Open the liquid outlet valv...

example 3

[0095] Example three, when the LNG liquid in the storage tank 42 is used up, repeat the action of example one, that is, one pump 46 starts the unloading process to fill a storage tank 42 with liquid, and one pump 45 starts the liquid addition process to use the LNG in another storage tank 41 The liquid is added to the outside through the gas dispenser, and they are carried out at the same time;

[0096] Similar to the action in Example 1, adjust the opening and closing of the pump and storage tank valve accordingly, which is omitted here.

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Abstract

The invention relates to a liquefied natural gas twin-pump gas station. The liquefied natural gas twin-pump gas station consists of two pumps, storage tanks, a gas dispenser, valves and a pipeline, and is characterized in that two liquid-phase liquid outlets of the storage tank are respectively connected with liquid inlets of the two pumps in series to be connected with a liquid discharging port of an LNG (liquefied natural gas) tank car; gas-phase gas return ports of the two pumps are connected with gas-phase ports of two storage tanks in an H form; a liquid outlet of each pump is divided into two branches, one branch is used as a liquid inlet branch of the gas dispenser, and the other branch is a liquid inlet branch entering the storage tank; the other gas-phase port of each storage tank is connected with an unloading gas-phase port of the tank car; various functions can be realized by virtue of connection forms of the ports and the opening and closing of the valves on the branches. According to the technical improvement, the storage tank corresponds to two pumps, after the LNG in the storage tank is used up, liquid is unloaded or waits to be unloaded into the storage tank, then the LNG in the other storage tank is used up by utilizing the two pumps, the LNG in the two storage tanks is used up in a circulating manner, and the layering rolling danger of the LNG storage tank can be prevented.

Description

technical field [0001] The invention relates to a liquefied natural gas double-pump filling station, which belongs to the supporting application field of energy infrastructure. Background technique [0002] In the existing liquid natural gas (also known as LNG, this article includes liquid coalbed methane, liquid shale gas, etc.) double-pump gas station, the two pumps are used as one on and one on standby, which can be divided into two situations, one is: the existing one Gas filling station with two tanks and two pumps, limited by the process pipeline, cannot transition from a gas filling station with one tank and two pumps to a gas filling station with two tanks and two pumps. It is obviously not economical to go up from the secondary station unless the pipeline is removed and rebuilt; the second is: the existing two-tank double-pump gas filling station has complex process pipelines and low pump efficiency, which cannot The function of unloading and filling at the same ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C5/02F17C13/02
Inventor 沈军
Owner 沈军
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