# US 9,752,824 B2 · Low-temperature device for separating and purifying gas based on small-sized low-temperature refrigerating machine

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- Number: US 9,752,824 B2
- Document ID: US9752824B2
- Status: Granted
- Kind: B2
- Application number: 14/378,019
- Filed: 2012-03-23
- Published: 2015-01-15
- Granted: 2017-09-05
- Earliest claimed: 2012-02-10
- Assignees: Csic Pride (Nanjing) Cryogenic Technology Co., Ltd.
- Applicants: Wenqing Dong; Wei Chao; Jie Chen; Ao Li; Jinlin Gao
- Inventors: Wenqing Dong; Wei Chao; Jie Chen; Ao Li; Jinlin Gao
- Web page: https://patentgrep.com/patent/US9752824B2

## CPC

- F25J 1/00: Processes or apparatus for liquefying or solidifying gases or gaseous mixtures {(recovering volatile solvents by condensation B01D5/00; vapor recovery systems combined with filling nozzles B67D7/54; solidification of carbonic acid C01B32/55; for ammonia in general C01C1/00)}
- F25B 9/02: using Joule-Thompson effect; using vortex effect
- F25B 9/14: characterised by the cycle used, e.g. Stirling cycle
- F25B 9/145: {pulse-tube cycle}
- F25J 3/0685: {separation of noble gases (from air F25J3/04642; in general C01B23/00)}
- F25J 3/069: {of helium}
- F25J 3/08: Separating gaseous impurities from gases or gaseous mixtures {or from liquefied gases or liquefied gaseous mixtures}(cold traps B01D8/00)
- F25J 2205/02: using simple phase separation in a vessel or drum
- F25J 2215/30: Helium
- F25J 2215/32: Neon
- F25J 2270/908: by regenerative chillers, i.e. oscillating or dynamic systems, e.g. Stirling refrigerator, thermoelectric ("Peltier") or magnetic refrigeration
- F25J: LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS {OR LIQUEFIED GASEOUS} MIXTURES BY PRESSURE AND COLD TREATMENT {OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE (cryogenic pumps F04B37/08; gas storage vessels, gas holders F17; filing vessels with, or discharging from vessels, compressed, liquefied or solidified gases F17C; refrigeration machines, plants, or systems F25B)}
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

A low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine includes a primary, secondary and quaternary heat exchanger, at least one small-sized low-temperature refrigerating machine, and at least one liquid collecting tank. The small-sized low-temperature refrigerating machine includes a first cold head and a second cold head, the secondary heat exchanger is provided on the first cold head to form a primary cold head heat exchanger, the quaternary heat exchanger is provided on the second cold head to form a secondary cold head heat exchanger, a mixed gas outlet is connected to an inlet of the primary cold head heat exchanger. By using primary and secondary cold heads of the small-sized low-temperature refrigerating machine as cold sources, gases having different condensing temperature are liquefied and solidified separately, and two or more gases can be separated and purified at a lower cost.

## Claims

### Claim 1

A low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine, comprising a primary heat exchanger, a secondary heat exchanger, a quaternary heat exchanger, at least one small-sized low-temperature refrigerating machine, and at least one liquid collecting tank located between the secondary heat exchanger and the quaternary heat exchange to form a gas path from the secondary heat exchange, to the liquid collecting tank, then to the quaternary heat exchanger such that mixed gas from the secondary heat exchanger reaches the liquid collecting tank before reaching the quaternary heat exchanger, wherein the small-sized low-temperature refrigerating machine comprises a first cold head and a second cold head, the secondary heat exchanger is provided on the first cold head to form a primary cold head heat exchanger, the quaternary heat exchanger is provided on the second cold head to form a secondary cold head heat exchanger, a mixed gas inlet, a mixed gas outlet, a purified gas inlet, and a purified gas outlet are provided on the primary heat exchanger, the mixed gas outlet is connected to an inlet of the primary cold head heat exchanger, an outlet of the primary cold head heat exchanger is connected to an inlet of the liquid collecting tank, a gas outlet of the liquid collecting tank is connected to an inlet of the secondary cold head heat exchanger, an outlet of the secondary cold head heat exchanger is connected to the purified gas inlet at a cold end of the primary heat exchanger, and a hot end of the primary heat exchanger is a first purified gas outlet.

### Claim 2 (depends on 1)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 1, wherein a tertiary heat exchanger is further provided between the gas outlet of the liquid collecting tank and the secondary cold head heat exchanger, and the outlet of the secondary cold head heat exchanger is connected to the first purified gas inlet at the cold end of the primary heat exchanger through the tertiary heat exchanger.

### Claim 3 (depends on 1)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 1, further comprising another refrigerating machine, wherein the another refrigerating machine comprises a primary heat exchange tank located at the first cold head and a secondary heat exchange tank located at the second cold head, a liquid outlet of the liquid collecting tank enters the first purified gas inlet at the cold end of the primary heat exchanger through the primary cold head heat exchanger, the gas outlet of the liquid collecting tank is connected to the inlet of the secondary cold head heat exchanger through the primary heat exchange tank, the outlet of the secondary cold head heat exchanger is connected to another liquid collecting tank, a gas outlet of the another liquid collecting tank is connected to a second purified gas inlet at the cold end of the primary heat exchanger through the secondary heat exchange tank, a liquid outlet of the another liquid collecting tank enters a third purified gas inlet at the cold end of the primary heat exchanger through the primary cold head heat exchanger and the primary heat exchange tank, the hot end of the primary heat exchanger is the first purified gas outlet, a second gas outlet and a third gas outlet.

### Claim 4 (depends on 2)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 2, wherein the primary heat exchanger, the secondary heat exchanger, the tertiary heat exchanger and the quaternary heat exchanger are of wound-tube heat exchanger, coiled pipe heat exchanger, plate heat exchanger or finned heat exchanger types.

### Claim 5 (depends on 4)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 4, wherein the small-sized low-temperature refrigerating machine is a GM refrigerating machine, a pulse tube refrigerating machine, a Stirling refrigerating machine or a J-T refrigerating machine.

### Claim 6 (depends on 2)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 2, wherein the primary heat exchanger, the secondary heat exchanger, the tertiary heat exchanger and the quaternary heat exchanger are of wound-tube heat exchanger, coiled pipe heat exchanger, plate heat exchanger or finned heat exchanger types.

### Claim 7 (depends on 3)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 3, wherein the primary heat exchanger, the secondary heat exchanger, the tertiary heat exchanger and the quaternary heat exchanger are of wound-tube heat exchanger, coiled pipe heat exchanger, plate heat exchanger or finned heat exchanger types.

### Claim 8 (depends on 6)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 6, wherein the small-sized low-temperature refrigerating machine is a GM refrigerating machine, a pulse tube refrigerating machine, a Stirling refrigerating machine or a J-T refrigerating machine.

### Claim 9 (depends on 7)

The low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine according to claim 7, wherein the small-sized low-temperature refrigerating machine is a GM refrigerating machine, a pulse tube refrigerating machine, a Stirling refrigerating machine or a J-T refrigerating machine.