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Filling method of composite refrigerant for MRC refrigeration cycle

A refrigeration cycle and composite refrigerant technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of extremely high requirements and complexity of operators, and achieve the effect of simplifying filling steps, equipment optimization, and simple operation.

Inactive Publication Date: 2015-12-16
税建平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the problem that the existing refrigerant filling method is too complicated and requires extremely high requirements for operators; to provide a kind of filling of composite refrigerant for MRC refrigeration cycle with low equipment investment cost, easy operation and ordinary personnel can operate method

Method used

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  • Filling method of composite refrigerant for MRC refrigeration cycle
  • Filling method of composite refrigerant for MRC refrigeration cycle
  • Filling method of composite refrigerant for MRC refrigeration cycle

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The working process of the MRC refrigeration cycle, such as figure 1 shown, including the following steps:

[0041] (1) After being pressurized by the circulating compressor, the refrigerant cools down and enters the separator, where it is separated into liquid and gaseous states;

[0042] (2) The separated liquid and gas enter the heat exchange system to provide cooling capacity;

[0043] (3) The refrigerant that has passed through the heat exchange system returns to the inlet of the circulating compressor for pressurization.

[0044] The composition and design ratio of the refrigerant in the MRC refrigeration cycle in this embodiment are: 9.5% nitrogen, 18.5% methane, 29% propane, 13% pentane, and 30% ethylene; the above ratios are expressed in molar percentages.

[0045] When the composite refrigerant is filled with refrigerant, it is composed of liquid refrigerant and gaseous refrigerant. In this embodiment, the liquid refrigerant is composed of propane, pentane a...

Embodiment 2

[0053] The difference between this embodiment and Embodiment 1 is that in this embodiment, nitrogen and methane are respectively filled into the inlet of the compressor, as figure 2 shown.

[0054] The specific filling process of this composite refrigerant in the present embodiment is as follows:

[0055] During the refrigeration cycle, the flow rate of the liquid refrigerant is fixed according to the operating load, and the detection point of the flow rate of the liquid refrigerant is located at point F.

[0056] When the refrigerant leaks during the refrigeration cycle, the inlet pressure of the circulating compressor at point P drops. When the pressure at point P drops to a certain level, methane and nitrogen are added to the refrigeration cycle system according to the calculated replenishment amount.

[0057] At the same time, when the refrigerant leaks during the refrigeration cycle, the liquid level of the separator at point L drops. At this time, the liquid refrigeran...

Embodiment 3

[0060] The difference between this embodiment and Embodiment 1 is that in this embodiment, the liquid refrigerant and the gaseous refrigerant are mixed and filled into the mixing tank, and then filled into the MRC refrigeration cycle from the mixing tank, so there must be The mixed state of gas and liquid, the specific filling method is:

[0061] When the refrigerant leaks during the refrigeration cycle, the inlet pressure of the circulation compressor at point P drops. When the pressure at point P drops to a certain level, gas is added to the refrigeration cycle system through the mixing tank.

[0062] At the same time, when the refrigerant leaks during the refrigeration cycle, the liquid level of the separator at point L drops. At this time, the liquid refrigerant contained in the mixing tank is filled into the refrigeration cycle system from the separator position, that is, from figure 1 Fill the middle ① with canned liquid refrigerant.

[0063] After the refrigerant of th...

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Abstract

The invention discloses a filling method of a composite refrigerant for an MRC refrigeration cycle. The problem that in an existing small liquefaction plant, the refrigerant filling method is complex is solved. The filling method of the composite refrigerant comprises the steps that the composite refrigerant is filled into the MRC refrigeration cycle, and all components of the composite refrigerant are filled into the MRC refrigeration cycle in a partial or full mixing mode, wherein the working process of the MRC refrigeration cycle comprises the steps that 1, the refrigerant is subjected to compression through a recycle compressor to be cooled and enters a separator to be separated into liquid and gas; 2, the separated liquid and gas enter a heat exchange system to supply refrigeration capacity for the outside; 3, the refrigerant passing through the heat exchange system returns to an inlet of the recycle compressor again to conduct compression. The filling method of the composite refrigerant for the MRC refrigeration cycle has the advantages that the operation steps are simplified, the requirements for operators are reduced, the input cost of equipment is reduced, the design is novel, and the effect is obvious.

Description

technical field [0001] The invention relates to a refrigerant replenishment method, in particular to a method for filling composite refrigerant for an MRC refrigeration cycle. Background technique [0002] The MRC refrigeration cycle refers to the cycle in which the refrigerant in the refrigeration cycle is composed of multiple components and is used for the application of liquefied natural gas. Natural gas liquefaction is a process of gradually lowering the temperature, and the temperature of natural gas needs to be lowered to about minus 160°C. Different refrigeration methods are used to liquefy natural gas, and the energy consumption is also different. There are usually the following refrigeration methods to liquefy natural gas: [0003] 1. Cascade refrigeration (the design energy consumption for liquefying 1 standard cubic meter of natural gas is about 0.30KW.h); [0004] 2. MRC refrigeration (the design energy consumption of liquefying 1 standard cubic meter of natur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B45/00
Inventor 税建平
Owner 税建平
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