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A cryogenic separation and helium recovery technology, applied in the field of petrochemical industry, can solve problems such as inability to flash helium components, mutual interference, non-compliance with content requirements, etc.
Pending Publication Date: 2021-10-29
VACREE TECH
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[0005] Using the conventional direct condensation method, the raw materialBOG is partially condensed, and then the partially condensed BOG is subjected to gas-liquid separation. Flash evaporation can recover most of the helium components, but the dissolved helium components cannot be flashed out. The direct by-product of pure nitrogen and qualified liquefied natural gas (the nitrogen component is higher when BOG is reliquefied, which does not meet the requirements of N in LNG products 2 Component <1.0v% content requirement)
[0006] If LNG is not produced as a by-product, then the reliquefied rich methane (except for the part used as fuel gas) can be returned to the raw materialnatural gas pipeline of the original LNG process unit and recycled to the entire LNG production facility for reliquefaction, helium extraction and the original LNG process There is a problem of mutual interference between the devices, which increases the complexity of the operation
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Embodiment 1
[0067] This embodiment is a cryogenic washing and separation process applied to the recovery of helium combined with the LNG process, and the corresponding process requires that the BOG gas does not contain H 2 component or H 2 Components are extracted in a downstream helium refining facility.
[0068] Such as figure 1 As shown, a cryogenic separation system for helium recovery, including a main heat exchanger E200, a flash device, a denitrification tower T200, and a refrigeration unit.
[0069] Such as figure 1 As shown, it also includes the BOG pipeline 01 connected to the main heat exchanger E200. The BOG compressor is installed on the BOG pipeline 01. The discharge pressure of the BOG compressor is preferably 5-30barA, and the best operating pressure is between 5-20barA In the meantime, the main heat exchanger E200 is a low-temperature plate-fin heat exchanger or a coiled-tube heat exchanger, which is used for heat exchange between incoming and outgoing cold and hot str...
Embodiment 2
[0092] The difference between this embodiment and Embodiment 1 is:
[0093] This embodiment is a split heat exchanger I for cryogenic scrubbing and separation process applied to helium recovery combined with LNG process. Specifically, in this embodiment, the liquid pipeline 14 and the gasification pipeline 15 , the liquid pipeline 21 and the gasification pipeline 22 are omitted.
[0094] Such as figure 2 As shown, the pipeline 16, the channel EP220, the channel EP208, the channel EP210 of the main heat exchanger E200, and the LIN discharge pipe 17 are connected in sequence.
[0095] The methane pipeline 12, the channel EP220, the channel EP209, the channel EP110 of the main heat exchanger E200, and the LNG discharge pipe 13 are connected in sequence.
[0096] A reboiler E110 is provided at the bottom of the flash device, a top condenser E220 is provided at the top of the denitrification tower T200, and a reboiler E210 is provided at the bottom of the denitrification tower T...
Embodiment 3
[0100] The difference between this embodiment and Embodiment 1 is:
[0101] This embodiment is a split heat exchanger II for cryogenic washing and separation process applied to helium recovery combined with LNG process. Specifically, in this embodiment, the liquid pipeline 14 and the gasification pipeline 15 , the liquid pipeline 21 and the gasification pipeline 22 are omitted.
[0102] Such as image 3 As shown, the pipeline 16, the channel EP220, the channel EP208, the channel EP210 of the main heat exchanger E200, and the LIN discharge pipe 17 are connected in sequence.
[0103] The methane pipeline 12, the channel EP220, the channel EP209, the channel EP110 of the main heat exchanger E200, and the LNG discharge pipe 13 are connected in sequence.
[0104] A reboiler E110 is provided at the bottom of the flash device, a top condenser E220 is provided at the top of the denitrification tower T200, and a reboiler E210 is provided at the bottom of the denitrification tower T20...
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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