Overload processing method for LNG tank car

A treatment method and tank truck technology, which are applied in the container filling method, the container discharge method, and the equipment loaded into the pressure vessel, etc., can solve the problems of long time consumption, insignificant liquid discharge effect, and high pressure at the back end of the cold insulation pipeline.

Inactive Publication Date: 2015-09-30
中海福建天然气有限责任公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] 1. Due to the high pressure at the back end of the cold insulation pipeline, the discharge pressure is high, and the discharge effect is not obvious
[0006] 2. Due to the cryogenic charact

Method used

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  • Overload processing method for LNG tank car

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Embodiment Construction

[0021] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0022] Such as figure 1 As shown, the supercharging vehicle 1 is connected with the supercharging gas phase arm 3 and the supercharging liquid phase arm 4, the supercharging vehicle gas phase arm 3 is provided with a third valve 3-1, and the supercharging vehicle liquid phase arm 4 is provided There is a fourth valve 4-1, and the nitrogen injection pipeline 5 is in communication with the gas phase arm 3 of the overloading vehicle.

[0023] The unloaded gas phase arm 6 and the unloaded liquid phase arm 7 are connected to the unloaded vehicle 2. The unloaded gas phase arm 6 is provided with a first valve 6-1, and the unloaded liquid phase arm 7 is provided with a second valve. The valve 7-1 and the BOG manifold 8 communicate wi...

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Abstract

The invention relates to an overload processing method for an LNG tank car. The overload processing method comprises the following steps: (1) connecting an empty tank car of an unloaded car with a pry, opening a first valve on a gas-phase arm of the unloaded car to decrease the pressure of the empty tank car of the unloaded car to be consistent with pressure of a BOG header, maintaining the first valve at an opening state, and closing a second valve on a liquid-phase arm of the unloaded car; (2) connecting an overloaded car with the pry, sequentially connecting a gas-phase arm and a liquid-phase arm of the overloaded car to the overloaded car, closing a third valve on the gas-phase arm of the overloaded car and a fourth valve on the liquid-phase arm of the overloaded car; (3) communicating one end of a cold-insulation circulating pipeline with the liquid-phase arm of the overloaded car, communicating the other end of the cold-insulation circulating pipeline with the liquid-phase arm of the unloaded car, opening a fifth valve and a sixth valve on the cold-insulation circulating pipeline, and starting a processing process; and (4) finishing the processing when the liquid level of the overloaded car is lower than the highest liquid level. The overload processing method is safe, reliable and efficient, damage of pipelines and equipment is avoided, and the loading operation of other tank cars is not influenced.

Description

Technical field [0001] The invention relates to a method for processing over loading of an LNG tanker. Background technique [0002] The existing tank truck overloading treatment is the nitrogen injection, boosting, and liquid discharge method. The specific steps are as follows: [0003] After discovering the over-installation, the tanker returns to the loading position and connects the gas phase arm and the liquid phase arm. Close the main circuit valves on the gas phase and liquid phase of the LNG loading on the tanker skid, open the circulating cooling valve, open the nitrogen injection valve on the gas phase arm, inject nitrogen from the top of the tanker to boost the pressure, and use the circulating cooling pipeline to remove the excess The LNG is compressed back into the LNG return line. [0004] This method has the following disadvantages: [0005] 1. Due to the high pressure at the back end of the cold preservation pipeline, the discharge pressure is high and the discharge ...

Claims

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Application Information

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IPC IPC(8): F17C7/02F17C5/06F17C5/02F17C13/00F17C13/04
Inventor 林素辉黎晖林晓东王海伟徐雷红张远杰刘浩庄楚平
Owner 中海福建天然气有限责任公司
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