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LNG (Liquefied Natural Gas) filling method for small ships

A marine and small-scale technology, which is applied in the direction of container filling method, container discharge method, equipment loaded into pressure vessel, etc., can solve the problems of pollution, high proportion of total amount, resource waste and environment, etc., and achieve simple process, efficient recycling, The effect of easy operation

Active Publication Date: 2015-04-29
WUHAN YUANFANG SCI & TECH CO LTD OF CHINA SANJIANG SPACE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for small ships with high filling frequency and small single filling volume, the residual liquid volume accounts for a high proportion of the total single filling volume, and direct emptying will cause serious waste of resources and environmental pollution

Method used

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  • LNG (Liquefied Natural Gas) filling method for small ships
  • LNG (Liquefied Natural Gas) filling method for small ships
  • LNG (Liquefied Natural Gas) filling method for small ships

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Embodiment Construction

[0024] Below in conjunction with specific embodiment the present invention is described in further detail:

[0025] see Figure 1 to Figure 3 , the marine LNG fueling method of the present invention, comprises the steps:

[0026] Step 1. Pipeline purge: Before the small marine LNG filling arm is officially put into use, or it has not been used for a long time, before it is put into use again, use compressed air or nitrogen as the medium to clean the residual impurities in the pipeline of the small marine LNG filling arm. Clean up the waste and excess to ensure that the pipeline of the LNG filling arm for small ships is clean. The specific operation is: confirm the ball valve 1 of the first liquid phase filling arm, the discharge valve 2 of the conveying filling arm, the ball valve 3 of the second liquid phase filling arm, the LNG liquid inlet valve 4, the branch pipe inert gas purge valve 5 and the BOG purge Valve 6 is closed, open the main inert gas purge valve 7 to introdu...

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Abstract

The invention discloses an LNG (Liquefied Natural Gas) filling method for ships. The LNG filling method comprises the following steps: I. pipeline precooling: detecting the dew point, enabling BOG (boil off gas) to enter a BOG storage tank or emptying a vent pipe of a stand column; II. filling outwards: opening an LNG liquid inlet valve, a second liquid phase filling arm ball valve, a filled ship liquid inlet valve, a filled ship gas return valve, a second gas phase filling arm ball valve and a BOG storage tank gas return valve for LNG filling; III. residual liquid recovery: opening a BOG blow-down valve and a third liquid phase filling arm ball valve, pressing residual LNG in a first conveying branched pipe of the pipeline at the top part of a conveying filling arm and in a three-dimensional joint into a filled ship tank, pressing residual LNG in the stand column and a second conveying branched pipe of the pipeline at the top part of the conveying filling arm into an LNG storage tank, thereby finishing residual liquid recovery. The method can realize recovery of BOG and residual LNG, is energy-saving and emission-reduction, can meet the national low-carbon and environment-friendly requirements and can be widely applied to the field of ship energy resource transportation.

Description

technical field [0001] The invention relates to the field of ship energy transportation, in particular to a small-sized ship LNG (Liquefied Natural Gas, liquefied natural gas) filling method. Background technique [0002] After the LNG filling arm is filled, a large amount of LNG liquid and BOG (Boil Off Gas, boil-off natural gas) gas remain in the pipeline. At present, the general treatment method at home and abroad is to directly empty it, which is acceptable for large ships with low filling frequency and large single filling volume. However, for small ships with high filling frequency and small single filling volume, the residual liquid volume accounts for a high proportion of the total single filling volume, and direct emptying will cause serious waste of resources and environmental pollution. In order to avoid this problem, it is necessary to study the recovery process of residual LNG liquid and BOG gas, so as to improve the fueling economy and fill the gap in this tec...

Claims

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Application Information

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IPC IPC(8): F17C5/02F17C13/00
Inventor 魏鹏肖天成余峰
Owner WUHAN YUANFANG SCI & TECH CO LTD OF CHINA SANJIANG SPACE GRP
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