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A kind of lng energy recovery process

An energy recovery and process technology, applied in steam engine installations, machines/engines, mechanical equipment, etc., can solve the problems of increasing BOG processing costs, high-grade energy loss, and large BOG volume, and achieve power consumption savings, effective recovery, BOG volume reduction effect

Active Publication Date: 2017-06-16
SICHUAN HENGRI GAS ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The general manufacturing process of liquefied natural gas is to liquefy the purified natural gas into high-pressure and low-temperature LNG through various refrigeration processes, and then further throttling and reducing the pressure through the Joule-Thomson (J-T) valve to form low-pressure and low-temperature LNG into atmospheric pressure. or low-pressure storage tanks, this process causes a great loss of high-grade energy leading to waste
At the same time, the flash evaporation of LNG produces a large amount of BOG, which increases the cost of BOG treatment

Method used

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  • A kind of lng energy recovery process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] LNG hydraulic turbine device (or other forms of expansion machinery) Take LNG hydraulic turbine device as an example:

[0028] Such as figure 1 Shown is a schematic flow chart of an LNG energy recovery process, including:

[0029] The natural gas purified by the pretreatment device enters the cold box 1, exchanges heat with the refrigerant in the heat exchanger in the cold box, and is liquefied through pre-cooling and cryogenic processes to form high-pressure and low-temperature LNG. The LNG passes through the LNG hydraulic turbine device. The expansion end 2 decompresses, converts its own pressure energy into mechanical energy, and outputs low-temperature, low-pressure LNG; after the low-temperature, low-pressure LNG is separated from gas and liquid by the gas-liquid separation tank 3, the liquid-phase LNG is sent to the LNG storage tank 4 for storage, and the gas-phase LNG is sent to the LNG storage tank 4 for storage. The BOG merges with the BOG from the LNG storage...

Embodiment 2

[0035] The expansion end 2 of the LNG hydraulic turbine device is of axial flow type.

[0036] A driving mode switching device 6 is provided between the expansion end 2 of the LNG hydraulic turbine device and the motor 7, and the driving mode switching device 6 adopts a hydraulic coupling.

[0037] Other parts are set the same as in embodiment 1.

[0038] After a large number of tests, the process of the present invention can increase the LNG output by about 1% to 3% compared with the original LNG output (using the Joule-Thomson (J-T) valve).

Embodiment 3

[0040] The expansion end 2 of the LNG hydraulic turbine device is screw type.

[0041] A driving mode switching device 6 is provided between the expansion end 2 and the motor 7 of the LNG hydraulic turbine device, and the driving mode switching device 6 adopts an overrunning clutch.

[0042] Other parts are set the same as in embodiment 1.

[0043] After a large number of tests, the process of the present invention can increase the LNG output by about 1% to 3% compared with the original LNG output (using the Joule-Thomson (J-T) valve).

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Abstract

The invention relates to the technical field of natural gas low temperature equipment, in particular to an LNG energy recovery process. By an LNG hydraulic turbine device (or expanding machinery in other forms), high pressure and low temperature LNG converts pressure energy to mechanical energy which is output by a supercharging end of the LNG hydraulic turbine device. Depressurized LNG is further cooled, a gas phase and a liquid phase generated in a depressurizing process are separated by a gas-liquid separation tank, the liquid LNG is charged to an LNG storage tank, and the gas phase BOG and BOG of the LNG storage tank are supercharged together by the supercharging end, namely, a BOG supercharger, of the LNG hydraulic turbine device. The LNG hydraulic turbine device replaces a J-T valve of the LNG product for expanding throttling, as the LNG is lower in temperature, output of the BOG is reduced, LNG yield is improved, and mechanical energy can be recovered by BOG supercharging of the BOG supercharging end.

Description

technical field [0001] The invention relates to the technical field of natural gas cryogenic equipment, in particular to an LNG energy recovery process. Background technique [0002] Liquefied Natural Gas (LNG), whose main component is methane, is recognized as the cleanest energy on earth. Colorless, odorless, non-toxic and non-corrosive, its volume is about 1 / 625 of the volume of the same volume of gaseous natural gas, and the weight of liquefied natural gas is only about 45% of the same volume of water. The burning of liquefied natural gas causes very little air pollution and releases a lot of heat, so liquefied natural gas is a relatively advanced energy source. [0003] The general manufacturing process of liquefied natural gas is to liquefy the purified natural gas into high-pressure and low-temperature LNG through various refrigeration processes, and then further throttling and reducing the pressure through the Joule-Thomson (J-T) valve to form low-pressure and low-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K25/02F01D15/08
Inventor 董雪松江健
Owner SICHUAN HENGRI GAS ENG CO LTD
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