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Technology of BOG recovery and device thereof

A technology of a process and recovery system, which is applied in the field of BOG (flash steam) recovery and its devices, to achieve the effects of simple operation, easy operation and simple process flow

Inactive Publication Date: 2013-10-09
GUANGZHOU HUAFENG ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of the existing technology, solve the problem that foreign BOG compressors need to be introduced for BOG recovery, and use commonly used reciprocating expanders and compressors to realize BOG reliquefaction and recovery. Measure to BOG to liquefy and recover

Method used

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  • Technology of BOG recovery and device thereof

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Embodiment Construction

[0031] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

[0032]The device of this example includes a nitrogen storage tank 1, a first compressor 4, a second compressor 8, a first expander 10, a second expander 13, an LNG storage tank 16, a first water-cooled heat exchanger 5, a second water-cooled Heat exchanger 9, first heat exchanger 12, second heat exchanger 14, pump 15, first flow meter 3, second flow meter 11, third flow meter 18, first control valve 2, second control valve 6. The third control valve 7, the fourth control valve 17, the fifth control valve 19, and the sixth control valve 20; the nitrogen storage tank 1 and the first compressor 4 pass through the first control valve 2 and the first flow meter 3 connection, the outlet of the first compressor 4 is connected with the hot flow inlet of th...

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Abstract

The invention discloses a technology of BOG recovery and a device of the technology of the BOG recovery. According to the technology of the BOG recovery, nitrogen from a nitrogen storage tank is compressed, and high-pressure nitrogen is obtained and enters a BOG recovery system; in the BOG recovery system, water cooling is performed on the nitrogen, then heat exchanging is performed on the nitrogen, low-temperature and high-pressure nitrogen is obtained and expanded to be in a normal-pressure state, temperature is further decreased, cooling capacity contained in the nitrogen is supplied to BOG from an LNG storage tank so that the BOG can be liquefied, and after the temperature of the nitrogen in the BOG recovery system goes up again to the temperature of the nitrogen storage tank, the nitrogen returns to the nitrogen storage tank. Through the method, using of an imported BOG compressor and compression of flammable and combustible hydrocarbon gas are omitted, the stable nitrogen serves as a cold carrier medium, and the BOG recovery is achieved through a common compressor and a common expanded machine in the market. The technology of the BOG recovery and the device are convenient to control, safe, simple in technological process and small in equipment investment, and have good industrialized popularization and application prospects.

Description

technical field [0001] The invention relates to the technical field of LNG (liquefied natural gas) storage and transportation, in particular to a process and device for recovering BOG (flash steam). Background technique [0002] The LNG storage tank is the core equipment of the LNG receiving terminal. It is a large storage tank with atmospheric pressure and low temperature. Some LNG receiving stations have also set up LNG tanker loading stations. Since the storage temperature of LNG is -162°C, the external heat is continuously transmitted to the interior of the storage tank through the tank material and auxiliary pipe fittings. When the submerged pump in the LNG tank is running, part of the mechanical energy is converted into heat energy. In addition, the external LNG is sent from the top of the tank. The volume displacement generated (such as when the LNG ship unloads) makes the LNG evaporate to form BOG (boil off gas), and the general evaporation amount is 0.05% (mass). I...

Claims

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Application Information

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IPC IPC(8): F17D1/02F17D3/01
CPCF25J1/0025F25J1/005F25J1/0072F25J1/0204F25J2270/16
Inventor 徐文东刘宗斌陈敏
Owner GUANGZHOU HUAFENG ENERGY TECH
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