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Liquid unloading method for liquefied natural gas or coal gas

A technology for liquefied natural gas and natural gas, which is applied in the method of container discharge, fixed-capacity gas storage tanks, gas/liquid distribution and storage, etc., can solve problems such as pump cavitation, reduce production costs, save gas discharge time, and improve The effect of the safety factor

Active Publication Date: 2015-07-08
SHANDONG TAISHAN STEEL GROUP
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Problems solved by technology

This patent is only applicable to the unloading of liquid ammonia, and it is difficult to apply to natural gas or coal gas with a lower liquefaction temperature, because natural gas is a low-temperature (-162°C) liquid with a gas-liquid ratio of 600:1, and it is easy to gasify when heated. The unloading of the pump is very easy to cause cavitation of the pump, and it is difficult to achieve the process of unloading pump and residual gas absorption tower on site.

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  • Liquid unloading method for liquefied natural gas or coal gas

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] During the unloading process of liquefied natural gas (LNG), the tank car 2 is pressurized by the unloading supercharger to form a pressure difference between the tank car 2 and the LNG storage tank 1, and the LNG is unloaded into the LNG storage tank 1 for reuse. The compressed air supply system discharges the residual air from the tanker to the user's pipe network.

[0023] 1) Park the liquid tanker 2 at the designated place, and check and record the tanker 2 according to the regulations.

[0024] 2) Connect the electrostatic grounding wire of the tank car 2 and the unloading platform firmly, and check the status of all relevant valves.

[0025] 3) Connect the gas and liquid phase hoses of the unloading platform and the liquid tanker 2.

[0026] 4) Slowly open the pressurized liquid phase valve 5 on the tank car, open the gas-liquid communica...

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Abstract

The invention discloses a liquid unloading method for liquefied natural gas or coal gas. The liquefied natural gas (LNG) liquid unloading process comprises the following steps: connecting three metal flexible pipes with an unloading platform, pressurizing a cryogenic liquid tanker by using an unloading supercharger to form a pressure difference between the cryogenic liquid tanker and a storage tank, unloading the LNG into the storage tank, and unloading residual gas in the cryogenic liquid tanker to user pipe network by using a medium pressure gas supply system. Compared with the existing liquid unloading method, the invention decreases the residual gas of the cryogenic liquid tanker from 0.4MPa to 0.15Mpa, and the residual gas in the tanker also decreases from 500kg to below 200kg, so as to meet the requirements of customers and save gas unloading time from the original 1 h to 15 min; and the safety coefficient is improved and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for unloading low-temperature liquid, in particular to a method for unloading low-temperature liquefied natural gas or coal gas from a low-temperature tank car into a storage tank. Background technique [0002] At present, during the unloading process of liquefied natural gas (LNG), after the liquid phase of the LNG tank car is unloaded, the pressure of the residual gas in the tank car reaches 0.4MPa, and it can no longer be unloaded. The requirement shall not exceed 200kg. [0003] Chinese patent application CN102829329A discloses a new method for unloading and conveying liquid ammonia. Under the working condition of liquid ammonia unloading: first, connect the tank car connection joint on the unloading pump inlet pipeline and the unloading gas phase communication pipeline with the liquid ammonia tank car. The unloading pump inlet valve, the rear unloading pump inlet valve, the unloading control valve, the liquid p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/02F17C7/04
Inventor 邵书东平纪芳徐光富
Owner SHANDONG TAISHAN STEEL GROUP
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