A kind of liquefied natural gas bog recovery device and recovery method

A technology of liquefied natural gas and a recovery method, which is applied in the field of recovery devices for liquefied natural gas evaporated gas, can solve the problems of high energy consumption, narrow application range, and difficult secondary flash operation of the recovery process, and achieve types and quantities reduction, responsiveness Effects with a wide range and easy operation

Active Publication Date: 2016-05-04
南通东湖国际商务服务有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to develop a set of BOG zero-emission system and method for the problems of high energy consumption, narrow application range, secondary flash evaporation and difficult operation of the BOG recovery process in the existing LNG production and transportation process.

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  • A kind of liquefied natural gas bog recovery device and recovery method

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Embodiment Construction

[0022] like figure 1 As shown, according to the accompanying drawings, this recovery method is: the device of the present invention consists of LNG storage tank 1, flow distributor 2,5,34; control valve 3,9,21; one-way valve 4,6,7 , 11, 14, 20, 22; two-way valve 8; heat exchange ice making device 10; grinder 12; liquid storage tank 13; water pump 15; hydrate reactor 16; one-way stop valve 17, 26, 27, 29 , 31, 35, 36; separation tank 18; BOG compressor 19; vertical three-phase separator 23; hydrate storage unit 24; hydrate decomposition unit 25; high-pressure pump 28; slurry pump 30; LNG storage tank insulation chamber 32; hydration reactor cooling chamber 33; mixing cooling unit 37; safety valve 38; pressure regulating valve 39; its recovery process mainly includes the following aspects:

[0023] 1: After the BOG in the LNG storage tank 1 exceeds a certain pressure, the gas passes through the pressure regulating valve 39 and then enters the first flow distributor 2 to be divi...

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Abstract

The invention relates to a technology for recovery and zero emission of boiled off gas generated during liquefied gas evaporation, in particular to a liquefied natural gas boiled off gas recovery device and method. BOG is recovered in the form of gas hydrate, secondary flash vaporization generated in the re-condensation technology can be well avoided, loads of the device are lessened, and energy consumption is saved. According to the amount of the generated BOG, part of LNG or part of the BOG is used for providing cold energy needed in the gas hydrate reaction process and the storage process, no external refrigerating device is needed, energy consumption is saved, the conditions needed in gas hydrate reaction are much more temperate than the conditions needed in re-condensation, the requirements for the device and materials are easy to reach, cost is saved, and relative safety is achieved. The BOG is used for replacing nitrogen and used as a thermal insulation layer of a storage tank, and the cold energy of the gas is fully utilized; meanwhile, the BOG can conduct precooling on water needed in the gas hydrate reaction process, the cold energy of the part of BOG before the part of BOG enters a compressor is fully utilized, and the low temperature resistant requirement of the compressor is also reduced.

Description

technical field [0001] The invention relates to the recovery and zero-emission technology of boil-off gas (BOG) generated by the vaporization of liquefied gas, in particular to a recovery device and method for liquefied natural gas boil-off gas. Background technique [0002] Due to the advantages of clean and pollution-free and high energy utilization rate, natural gas is taking an increasing share in the global energy market; natural gas under normal pressure changes from a gaseous state to a liquid state at -162°C, and its volume shrinks to 1 / 600, this natural gas stored in liquid form is called liquefied natural gas (LNG). [0003] LNG utilization is considered to be the most effective way to solve the problem of ocean transportation of natural gas, development of oil and gas fields in desert areas, and recovery of natural gas in remote areas. Accelerating the development of imported LNG is also the most effective measure for my country to optimize energy structure, impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/02F17C13/00
Inventor 周诗岽余益松吴志敏王树立李恩田
Owner 南通东湖国际商务服务有限公司
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