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A kind of process method of full recovery of mixed refrigerant

A process method and technology for mixing refrigerants, applied in the oil and gas industry, can solve the problems of releasing refrigerant, increasing operating costs, slow restarting process, etc., and achieving the effect of reducing pre-cooling time, reducing economic losses, and saving start-up time.

Active Publication Date: 2017-07-21
SICHUAN HENGRI GAS ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main components of the mixed refrigerant are nitrogen, methane, ethylene, propane, butane and pentane, among which ethylene, propane, butane and pentane are petrochemical products with high prices, and a large amount of refrigerant will be released during the maintenance of the device. Cause serious waste of resources and increase operating costs
[0004] At present, some patents, such as the patent application "A Method and System for Recycling and Utilizing Mixed Refrigerants" with the publication number CN 103383182 A, although they have played a role in refrigerant recovery, due to the imperfect process, full recovery cannot be realized, and parking After starting up again, the refrigerant returned to the system is less than 60% of the original refrigerant, and due to the lack of cooling recovery, the refrigerant needs to be lowered to a low temperature again, and the restart process is slow, which seriously reduces the economical efficiency of the device

Method used

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  • A kind of process method of full recovery of mixed refrigerant
  • A kind of process method of full recovery of mixed refrigerant

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Experimental program
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specific Embodiment approach

[0031] figure 1 , figure 2 The full flow of this recycling method is shown. When the liquefaction plant system or the equipment of a certain refrigerant circulation system needs to be overhauled, it needs to be shut down for operation. However, handling of the mixed refrigerant after shutdown is a key issue. The previous practice was to short directly, which caused a lot of economic losses. Based on this, there is a research on this method. The method separates the hot and cold refrigerants into two systems and recovers them separately, meeting the requirement of full recovery of the refrigerants.

[0032] (1) When the machine is shut down for maintenance, the compressor 1 of the refrigerant circulation system stops running. At the inlet of compressor 1, it is a hot and low-pressure refrigerant, where the refrigerant is in a complete gas state, and needs to be pressurized by a small refrigerant compressor 4 to the same pressure as the outlet of compressor 1 of the circula...

Embodiment 1

[0039] After the compressor 1 of the refrigerant circulation system stops running, the hot high-pressure valve 8 is first opened, and the hot high-pressure liquid-phase refrigerant is recovered according to the process described in (3) above. Then judge the pressure of the hot high-pressure gas-phase refrigerant and the pressure in the hot-low pressure refrigerant recovery tank 6. If the pressure of the gas-phase refrigerant is small, it needs to go through the pressure reducing valve 3 to reduce the pressure, and then go through the small compressor 4 to increase the pressure. pressure, then enter the hot and low pressure refrigerant recovery tank 6 for storage. If the gas-phase pressure is sufficient to enter the hot and low-pressure refrigerant recovery tank 6 , the bypass valve 7 is opened, and the gas-phase refrigerant directly enters the hot and low-pressure refrigerant recovery tank 6 .

[0040] After the recovery of the hot high-pressure refrigerant is completed, at th...

Embodiment 2

[0045] After the compressor 1 of the refrigerant circulation system stops running, the hot high-pressure valve 8 is first opened, and the hot high-pressure liquid-phase refrigerant is recovered according to the process described in (3) above. Then judge the pressure of the hot high-pressure gas phase refrigerant and the pressure in the hot low pressure refrigerant recovery tank 6, if the gas phase pressure is enough to enter the hot low pressure refrigerant recovery tank 6, then open the bypass valve 7, and the gas phase refrigerant directly enters the hot low pressure refrigerant recovery tank 6. Agent recovery tank 6.

[0046] After the recovery of the hot high-pressure refrigerant is completed, at this time, the pressure of the entire refrigerant circulation system drops. Close the hot high-pressure valve 8, open the hot low-pressure valve 2, and recover the hot and low-pressure refrigerant according to the process described in (1).

[0047] At the same time, the low-tempera...

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Abstract

The invention relates to the oil and gas industry and the technical field of refrigerant recovery, in particular to a process method for full recovery of mixed refrigerants, which isolates cold and hot refrigerants into two systems and recovers them separately. The hot and low-pressure refrigerant is boosted to high pressure by a small compressor and stored in a high-pressure state; the hot and high-pressure refrigerant is recovered to the refrigerant recovery tank through a refrigerant pump, and the rest of the gas phase is depressurized and then recovered by a compressor; low temperature The refrigerant is recovered to the low-temperature refrigerant recovery tank through the system pressure supplement, and the temperature is controlled to stabilize. When the machine is restarted, it is directly replenished to the low-temperature side of the cold box to reduce the pre-cooling time and realize the complete recovery of the refrigerant.

Description

technical field [0001] The invention relates to the oil and gas industry and the technical field of refrigerant recovery, in particular to a process method for full recovery of mixed refrigerant. Background technique [0002] As a high-quality, efficient and clean fuel, natural gas is being increasingly widely developed and utilized in the fields of energy and transportation. The primary issue in the development and utilization of natural gas is its liquefaction and storage. In recent years, the liquefied natural gas industry has developed rapidly in China, and more and more liquefied natural gas devices have been built and put into operation. Most of the installations that have been built or are under construction use the mixed refrigerant refrigeration process. Mixed refrigerants generally consist of nitrogen, methane, ethylene or ethane, propane or propylene, butane and pentane. When the liquefied natural gas plant is in normal operation, only a small amount of repleni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B45/00
Inventor 苏柯洋
Owner SICHUAN HENGRI GAS ENG CO LTD
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