Gas recovery system, compressor system, and refrigeration cycle system

Patent metadata

Field	Value
Publication number	US-10337779-B2
Application number	US-201515562230-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	Apr 27, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A gas recovery system separates a mixed gas including a process gas and an inert gas. The gas recovery system includes a cooling section for cooling and liquefying the process gas contained in the mixed gas by cooling the mixed gas at a temperature higher than a condensation temperature of the inert gas and lower than a condensation temperature of the process gas, a separating section for separating the cooled mixed gas into the process gas in a liquid state and the inert gas in a gas state, and a process gas recovery line that is connected to the separating section which circulates and gasifies the liquid-state process gas and then supplies the process gas into the a compressor. The mixed gas is formed by mixing the process gas, which is compressed by the compressor, and the inert gas, which is supplied to a seal portion of the compressor.

First claim

The invention claimed is:

1. A gas recovery system that separates a mixed gas, in which a process gas compressed by a compressor and an inert gas supplied to a seal portion of the compressor are mixed together, into the process gas and the inert gas, the gas recovery system comprising:
a cooling section that cools and liquefies the process gas contained in the mixed gas by cooling the mixed gas at a temperature that is higher than a condensation temperature of the inert gas and lower than a condensation temperature of the process gas;
a separating section that separates the mixed gas cooled in the cooling section into the process gas in a liquid state and the inert gas in a gas state; and
a process gas recovery line that is connected to the separating section and that circulates and gasifies the liquid-state process gas and then supplies the process gas into the compressor.

2. The gas recovery system according to claim 1 ,
wherein the cooling section cools the mixed gas by exchanging heat between a liquefied natural gas and the mixed gas.

3. The gas recovery system according to claim 1 ,
wherein the cooling section cools the mixed gas by exchanging heat between the liquid-state process gas that flows through the process gas recovery line, and the mixed gas.

4. The gas recovery system according to claim 1 , further comprising:
a first compressor that compresses the mixed gas before being supplied to the cooling section.

5. The gas recovery system according to claim 1 , further comprising:
a second compressor that compresses the process gas in a gas state that flows through the process gas recovery line.

6. The gas recovery system according to claim 1 ,
wherein the separating section stores the separated liquid-state process gas, and
wherein the gas recovery system further includes a supply adjustment section that supplies the liquid-state process gas to the process gas recovery line such that the liquid level of the liquid-state process gas is maintained at a certain position in the separating section.

7. A compressor system comprising:
a compressor; and
the gas recovery system according to claim 1 .

8. A refrigeration cycle system comprising:
the compressor system according to claim 7 .

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Watanabe Takuya
• Mizushita Koichi
• Takeda Tomoaki
• Mori Yasushi

Classifications

• F25J2270/904

  by liquid or gaseous cryogen in an open loop · CPC title

• F25J1/0279

  Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc. · CPC title

• F25J2245/02

  Recycle of a stream in general, e.g. a by-pass stream · CPC title

• F25J3/0635

  separation of CnHm with 1 carbon atom or more · CPC title

• F25J2270/02

  Internal refrigeration with liquid vaporising loop · CPC title