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BOG and LNG cold energy comprehensive recycling system and process

A technology of cold energy and technology, applied in the field of comprehensive energy recovery and utilization of LNG (liquefied natural gas) receiving stations, can solve the problems of low efficiency and low utilization efficiency, and achieve the effects of strong synergy, efficiency improvement and waste reduction

Pending Publication Date: 2020-09-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the low efficiency of converting cold energy into electrical energy in the low-temperature Rankine cycle, the utilization efficiency of this method is not high.

Method used

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  • BOG and LNG cold energy comprehensive recycling system and process

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Embodiment Construction

[0034] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited to the range expressed in the examples.

[0035] The construction scale of a peak-shaving LNG receiving station is 500×10 4 t / a, base load of LNG export is maintained at 150*10 4 SM 3 / d (that is, 45t / h), the output volume of peak regulation is 1800*10 4 SM 3 / d (that is, 585t / h), the temperature of LNG leaving the storage tank is -161°C, and the gasification pressure is 8MPa. The maximum gasification output capacity is 6000*10 4 SM 3 / d.

[0036] The BOG output of the LNG receiving station is 6.12~6.36t / h when the base load is not unloaded, the BOG output is 22.94~23.10t / h when the base load is unloaded, and the BOG output is 23.10t / h. 43.81~44.68t / h, BOG output for peak shaving and unloading ships is 60.39~63.46t / h. The station is e...

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Abstract

The invention discloses a BOG and LNG cold energy comprehensive recycling system and process. The BOG and LNG cold energy comprehensive recycling system comprises a BOG condensation regasification system, a BOG direct compression outputting system, a BOG combined heat and power generation system and an LNG cold energy power generation system; the BOG condensation regasification system comprises anLNG storage tank, an LNG immersed pump, an LNG booster pump, a BOG buffering tank, a condensation regasification system BOG compressor, a pressurization LNG-BOG precooler and a BOG recondenser; the BOG direct compression outputting system comprises a BOG sea water preheater, an outputting system BOG compressor and a BOG sea water cooler; and the BOG combined heat and power generation system comprises a thermoelectric power system BOG compressor, BOG pressure-adjusting metering equipment, a first gas turbine power generation unit, a flue gas waste heat boiler and a second gas turbine power generation unit. The BOG and LNG cold energy comprehensive recycling system and process is suitable for BOG recovery systems under different working conditions, and the problem of difficult recovery caused by excessively-large fluctuation of the BOG output is solved.

Description

technical field [0001] The invention belongs to the field of energy comprehensive recovery and utilization of LNG (liquefied natural gas) receiving stations, and in particular relates to a system and process for comprehensive recovery and utilization of BOG and LNG cold energy. Background technique [0002] As of the first half of 2019, 21 LNG stations have been built and put into operation in China, but the cold energy generated during LNG loading and unloading has not been well utilized. At the same time, a large amount of BOG (LNG boil-off gas) will be generated during the operation of the LNG receiving station, which has not been well recycled. Currently, only a small part of BOG (flash gas) has been recovered, and most of the BOG is burned through the flare system Empty, resulting in a waste of energy. These two parts have caused a large degree of energy waste, which in turn has led to great economic losses. Therefore, it is of great significance to design appropriate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/04F17C13/00F17D1/02F17D3/01F23J15/06F28D7/16F02C6/00F02C6/18F01B23/10
CPCF17C7/04F17C13/002F17D1/02F17D3/01F23J15/06F28D7/16F02C6/00F02C6/18F01B23/10F17C2223/0161F17C2265/032F17C2265/06F17C2265/07Y02E20/30Y02E20/14
Inventor 徐文东李璋怡张琳何智辉
Owner SOUTH CHINA UNIV OF TECH