Three-cycle natural gas liquefaction device and method suitable for ultra-large scale

A super-large-scale, liquefaction device technology, applied in liquefaction, refrigeration, liquefaction, solidification, etc., can solve the problems that cannot meet the needs of LNG device construction, and achieve the effect of rich system adjustment means, less process equipment, and good operation adaptability

Pending Publication Date: 2019-08-30
CHINA PETROLEUM ENG CORP LTD +2
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Problems solved by technology

Based on the MSC process, the development of a single-train 3.5 million tons / year natural gas liquefaction process package has been realized, but this process cannot meet the construction of a single-train 6-8 million tons / year ultra-large-scale LNG plant

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  • Three-cycle natural gas liquefaction device and method suitable for ultra-large scale

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Embodiment Construction

[0030] A three-cycle natural gas liquefaction device suitable for ultra-large scale, such as figure 1 As shown, including: propane pre-cooling plate-fin heat exchanger 1, WMR coiled tube heat exchanger 2, CMR coiled tube heat exchanger 3, LNG hydraulic turbo expander 4, LNG flash tank 5, LNG Booster pump 6, propane compressor 7, propane compressor outlet cooler 8, first high-pressure propane throttle valve 9, second high-pressure propane throttle valve 10, high-pressure propane gas-liquid separation tank 11, first medium-pressure propane section Throttle valve 12, second medium-pressure propane throttle valve 13, medium-pressure propane gas-liquid separator tank 14, low-pressure propane throttle valve 15, low-pressure propane gas-liquid separator tank 16, WMR compressor inlet buffer tank 17, WMR compressor Machine 18, WMR compressor outlet cooler 19, WMR hydraulic turbo expander 20, CMR compressor inlet buffer tank 21, CMR compressor 22, CMR compressor outlet cooler 23, CMR hy...

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Abstract

The invention discloses a three-cycle natural gas liquefaction device and method suitable for ultra-large scale. The device comprises a natural gas liquefaction pipeline, a propane precooling circulation system, a WMR refrigeration circulation system and a CMR refrigeration circulation system. Compared with the prior art, the device has the positive effects that on the basis of three cycles, eachstage of refrigeration load is shared, natural gas is sequentially cooled through one plate-fin heat exchanger and two coiled tube heat exchangers until liquefaction and supercooling, the number of process equipment is small, and the scale of a natural gas liquefaction device can reach 6-8 million tons per year; and the refrigeration required by the liquefaction process is provided by three systems of propane, WMR mixed refrigerant and CMR mixed refrigerant, the system adjustment means are rich, the matched refrigeration can be provided for the natural gas liquefaction process, the operation is flexible, and the adaptability to raw materials is good.

Description

technical field [0001] The invention relates to the field of cryogenic technology for natural gas liquefaction, and specifically relates to a super-large-scale three-cycle natural gas liquefaction device and method. By adopting a three-stage refrigeration cycle, the loads of the pre-cooling section, the liquefaction section and the supercooling section are distributed, and the high-efficiency equipment, simplify the process, and meet the construction needs of ultra-large-scale natural gas liquefaction plants with a single-train capacity of 6 million to 8 million tons per year. Background technique [0002] With the continuous development of LNG technology and equipment, the general trend of international LNG plant construction is towards large-scale development, with a single-train production capacity of 3-5.5 million tons per year, and the largest scale has reached 7.8 million tons per year. The liquefaction process technologies used in the construction of large-scale LNG p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0279F25J1/0022F25J1/0042F25J1/0052F25J1/0057F25J1/0087F25J1/0218F25J1/0263F25J1/0292
Inventor 蒲黎明蒋志明郭成华郑春来刘家洪王科陈运强李莹珂王毅汤晓勇黄勇田静汪贵周璇王刚李龙谢顶衫
Owner CHINA PETROLEUM ENG CORP LTD
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