Liquefied natural gas unloading method and device

A technology of liquefied natural gas and unloading device, which is applied in the method of container discharge, fixed-capacity gas storage tank, gas/liquid distribution and storage, etc., can solve problems such as environmental pollution and waste of resources

Active Publication Date: 2021-05-18
SHENZHEN GAS CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method and device for unloading liquefied natural gas, which can solve the problems of waste of resources, environmental pollution and potential safety hazards caused by the discharge of a large amount of natural gas in the nitrogen replacement of the existing storage tanks.

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  • Liquefied natural gas unloading method and device
  • Liquefied natural gas unloading method and device
  • Liquefied natural gas unloading method and device

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Embodiment Construction

[0034] The present invention provides a method and device for unloading liquefied natural gas. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] In the embodiments and the scope of the patent application, unless there is a special limitation on the article, "a" and "the" can generally refer to a single one or a plurality of them.

[0036] In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates t...

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Abstract

The invention discloses a liquefied natural gas unloading method and device. The method comprises the steps that a first liquid inlet of a storage tank communicates with a first liquid outlet of a tank car tank; the first liquid inlet is formed in the bottom of the storage tank; liquefied natural gas in the tank car tank is guided into the storage tank, so that residual liquid nitrogen in the storage tank is gasified; and liquefied natural gas is continuously guided in, and when the liquid level of the liquid natural gas in the storage tank rises to enable the pressure in the storage tank to reach 0.3 MPa, the gasified liquid nitrogen is discharged through a gas phase opening of the storage tank. According to the liquefied natural gas unloading method and device, nitrogen is directly replaced with low-temperature LNG, unnecessary resource waste is avoided, and the replacement process is environmentally friendly, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of natural gas transportation, in particular to a method and device for unloading liquefied natural gas. Background technique [0002] First of all, the storage tank should be kept in a low temperature state after being pre-cooled by liquid nitrogen before filling with liquefied natural gas (LNG). Then, the storage tank needs to discharge residual liquid nitrogen and nitrogen before entering the liquid natural gas (LNG), that is: the liquid level of the storage tank reaches zero liquid level (the liquid level gauge returns to zero) and is in a low pressure state (less than 10KP), and then Use low-temperature natural gas (Boiled Off Gas, BOG) in the LNG tanker tank for replacement. [0003] In order to replace the nitrogen in the storage tank in place, it is necessary to fully mix the low-temperature nitrogen in the storage tank with the low-temperature natural gas and then discharge it. If the mixture is in...

Claims

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Application Information

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IPC IPC(8): F17C7/02F17C1/12F17C7/04
CPCF17C7/02F17C1/12F17C7/04F17C2201/0109F17C2201/032F17C2221/033F17C2223/0153F17C2227/041F17C2227/046F17C2250/043
Inventor 黄志伟邹文龙王洪东崔腾飞杨文昭
Owner SHENZHEN GAS CORP
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