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Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system

A mixed refrigerant and propane pre-cooling technology, applied in the field of natural gas liquefaction, can solve the problems of equipment investment waste, poor heat exchange performance, high dependence on imported equipment, and achieve the effect of improving liquefaction capacity

Inactive Publication Date: 2012-09-05
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the liquefaction technologies used in foreign base-load natural gas liquefaction plants, tank-type or shell-and-tube heat exchangers are often used for propane precooling, which has poor heat transfer performance and wastes equipment investment. High equipment investment and high dependence on imported equipment

Method used

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  • Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system
  • Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0014] The propane pre-cooling dual-mixed refrigerant parallel liquefaction system provided in this embodiment includes a pre-cooling cold box 1, liquefaction cold boxes 2 and 2', a propane pre-cooling circulation mechanism, and two sets of mixed cooling boxes matched with the liquefaction cold boxes 2 and 2'. agent liquefaction cryogenic cycle mechanism; propane precooling cycle mechanism includes propane compressor a31, propane compressor b32, propane compressor c33 and propane compressor d34 connected in sequence; the outlet of propane compressor a31 is connected with propane gas-liquid separation tank in sequence a41, propane gas-liquid separation tank b42, propane gas-liquid separation tank c43 and propane gas-liquid separation tank d44 are connected; propane compressor a31 and propane gas-liqui...

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Abstract

The invention discloses a propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system, which comprises a pre-cooling cold box, two liquefaction cold boxes, a propane pre-cooling circulating mechanism and two mixed refrigerant liquefaction deep-cooling circulating mechanisms, wherein the propane pre-cooling circulating mechanism comprises a three-grade compression unit; and each mixed refrigerant liquefaction deep-cooling circulating mechanism comprises a first-grade compression unit. The liquefaction system provided by the invention adopts a propane pre-cooling double-mixing refrigerant parallel-connection refrigeration mode, and liquefaction and undercooling circulation adopt double-mixing refrigerant refrigeration circulation; the power distribution of three compressor units (one propane compressor and two mixing refrigerant compressors) is effectively balanced; the limitation on that the processing capability of the whole liquefaction device is affected because one compressor has too large power can be broken through; and the liquefaction capability of the device can be improved according to the maximum limitation of the current single compressor.

Description

technical field [0001] The invention relates to a propane precooling double mixed refrigerant parallel liquefaction system, in particular to a propane precooling double mixed refrigerant parallel liquefaction system applied to a base-load type natural gas liquefaction plant, belonging to the technical field of natural gas liquefaction. Background technique [0002] At present, most common natural gas liquefaction technologies in China are nitrogen expansion, single-stage mixed refrigerant cycle or series liquefaction refrigeration process, which can only be applied to small-scale LNG plants. Among the liquefaction technologies used in foreign base-load natural gas liquefaction plants, tank-type or shell-and-tube heat exchangers are often used for propane precooling, which has poor heat transfer performance and wastes equipment investment. The investment in equipment is high and the dependence on imported equipment is high. [0003] In the liquefaction technology of the base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
Inventor 唐令力单彤文陈杰花亦怀杨文刚尹全森程昊
Owner CHINA NAT OFFSHORE OIL CORP
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