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Method of reducing interstage temperature of propane compressor in propane compressor cycle refrigerating system

A refrigeration system and compressor stage technology, applied in the fields of natural gas liquefaction and low temperature air separation, can solve the problems of reduced compressor efficiency and increased power consumption, and achieve the effects of reducing heat exchange load, eliminating influence and improving work efficiency

Active Publication Date: 2012-07-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the propane compressor starts up or operates under low load conditions, the inlet temperature of each stage of the compressor increases due to the backflow of the anti-surge pipeline or the return pipeline, resulting in a decrease in compressor efficiency, increased power consumption, and heat exchange at the compressor outlet The device needs to provide more heat transfer load to meet the process requirements

Method used

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  • Method of reducing interstage temperature of propane compressor in propane compressor cycle refrigerating system
  • Method of reducing interstage temperature of propane compressor in propane compressor cycle refrigerating system

Examples

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Effect test

Embodiment 1

[0012] Embodiment 1, reduce compressor interstage temperature

[0013] The raw natural gas liquefaction of a gas field, the raw gas composition is 94.94% methane, 2.33% ethylene, 1.95% nitrogen, 0.52% propane, 0.13% butane, 0.12% isobutane; the annual output of the device is 2.6 million tons of LNG, Pre-cooled by four-stage propane, then enters into liquefaction, deep cooling, throttling and cooling, it becomes liquefied natural gas and enters the storage tank; propane enters the propane compressor and is compressed in four stages, then enters the cooler E-01 to cool to 45°C, and the condenser E-02 condenses to 41°C.

[0014] In this propane compressor cycle refrigeration system, the temperature and pressure of the propane returned from the pre-cooling cold box to the buffer tank V-01 of the first-stage compressor in the fourth stage are -36.9°C and 109kPaA respectively; the three-stage return of the cold box to the second-stage compressor The temperature and pressure of the ...

Embodiment 2

[0016] Embodiment 2, reduce compressor interstage temperature

[0017] A natural gas processing unit is equipped with an independent propane compressor circulating refrigeration system, which is designed to provide the necessary cooling load for the fractionation unit of the processing unit and its supporting pretreatment unit. Low-pressure propane refrigerant (temperature -8.56°C, pressure 2.05 barg) passes through the high-low pressure propane heat exchanger E-07 for heat exchange, and then enters the first-stage propane compressor C-01A through the primary inlet buffer tank V-01 of the compressor to be compressed to 6.18barg, the medium-pressure propane (temperature -16.61℃, pressure 6.18barg) from the propane heat exchanger of the pretreatment unit is mixed with the refrigerant from the C-01A outlet of the primary propane compressor and then enters the secondary inlet buffer of the propane compressor The tank V-02 is compressed by the secondary propane compressor C-01B, th...

Embodiment 3

[0020] Embodiment 3, reduce compressor interstage temperature

[0021] The raw material natural gas liquefaction of a gas field in a cold region adopts the same process as in Example 1; the temperature of the cooling medium decreases, propane enters the propane compressor and is compressed in four stages, and then enters the cooler E-01 to cool to 23°C, and the condenser E- 02 condenses to 19°C.

[0022] In this propane compressor cycle refrigeration system, the temperatures of the propane returned to the compressor inlet buffer tanks V-01 to V-04 from the fourth section to the first section of the pre-cooling cold box are respectively -36.9°C, -21.6°C, -6.3°C and 7.4°C ℃.

[0023] When the propane compressor cycle refrigeration system operates at low load, the pre-cooling compressors (propane compressors C-01A, C-01B, C-01C and C-01D) need to lead back the propane gas from the cooler E-01 Perform surge reflux; the temperatures of the anti-surge reflux propane gas entering t...

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Abstract

The invention discloses a method of reducing the interstage temperature of a propane compressor in a propane compressor cycle refrigerating system, and the method comprises the flowing steps: communicating a propane accumulating tank in the propane compressor cycle refrigerating system with each anti-surge pipeline or return pipeline, and arranging throttle valves the communicated pipelines; and arranging adjusting valves on the pipelines through which the propane accumulating tank is communicated with the anti-surge pipelines or the return pipelines. The method of reducing the interstage temperature of the propane compressor in the propane compressor cycle refrigerating system can be used for effectively improving the working efficiency of the compressor, reducing the heat exchange load of a heat exchanger at the outlet of the compressor, and eliminating the influence of change of interstage temperature of the compressor on the frige heat exchanger in low-load running working conditions.

Description

technical field [0001] The invention relates to a method for reducing the interstage temperature of a propane compressor in a propane compressor cycle refrigeration system, and belongs to the technical field of natural gas liquefaction and low-temperature air separation. Background technique [0002] At present, the propane precooling liquefaction process has become a mature liquefaction technology at home and abroad. When the propane compressor starts up or operates under low load conditions, the inlet temperature of each stage of the compressor increases due to the backflow of the anti-surge pipeline or the return pipeline, resulting in a decrease in compressor efficiency, increased power consumption, and heat exchange at the compressor outlet The device needs to provide more heat transfer load to meet the process requirements. Therefore, there is a need for a method for reducing the inlet temperature between stages of a propane compressor to improve the working efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B39/06F25B41/04
Inventor 宋坤陈海平许佳伟宋波衣鹏
Owner CHINA NAT OFFSHORE OIL CORP
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