BOOSTING SYSTEM, AND BOOSTING METHOD OF GAS

• US 20160123351A1
• Filed: 01/14/2014
• Published: 05/05/2016
• Est. Priority Date: 01/14/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries Compressor Corporation (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries Compressor Corporation (Mitsubishi Heavy Industries, Ltd.)
• Inventors: NAGAO, Hideki, YONEMURA, Natao
• Granted Patent: US 10,570,927 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F04B 23/04 Combinations of two or more pumps
• CPC Class Codes: F04B 41/06 Combinations of two or more pumps
• CPC Class Codes: F04D 13/12 Combinations of two or more pumps combinations with priming pumps or booster pumps to counteract vapour-lock F04D9/04
• CPC Class Codes: F04D 15/0005 by using valves
• CPC Class Codes: F04D 15/0022 throttling valves or valves varying the pump inlet opening or the outlet opening
• CPC Class Codes: F04D 25/16 Combinations of two or more pumps ; Producing two or more separate gas flows
• CPC Class Codes: F04D 27/002 by varying geometry within the pumps, e.g. by adjusting vanes
• CPC Class Codes: F04D 29/181 Axial flow rotors F04D29/185 take precedence
• CPC Class Codes: F04D 29/22 specially for centrifugal pumps
• CPC Class Codes: F04D 29/286 multi-stage rotors
• CPC Class Codes: F04D 29/321 for axial flow compressors
• CPC Class Codes: F04D 29/5826 Cooling at least part of the working fluid in a heat exchanger
• CPC Class Codes: F04D 29/5833 flow schemes and regulation thereto
• CPC Class Codes: F04D 29/5866 Cooling at last part of the working fluid in a heat exchanger
• CPC Class Codes: F25J 2230/20 Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft
• CPC Class Codes: F25J 2230/32 Compression of the product stream
• CPC Class Codes: F25J 2230/80 the fluid being carbon dioxide
• CPC Class Codes: F25J 2235/80 the fluid being carbon dioxide
• CPC Class Codes: F25J 2270/02 Internal refrigeration with liquid vaporising loop
• CPC Class Codes: F25J 2270/80 Quasi-closed internal or closed external carbon dioxide refrigeration cycle
• CPC Class Codes: F25J 3/0266 : separation of carbon dioxide production of carbon dioxide in general C01B32/00
• CPC Class Codes: F25J 3/067 : separation of carbon dioxide production of carbon dioxide in general C01B32/00
• CPC Class Codes: Y02C 20/40 : of CO2

Abstract

A boosting system which boosts a target gas to a pressure which is equal to or greater than a target pressure higher than a critical pressure includes a compression portion which compresses the target gas to an intermediate pressure which is equal to or greater than the critical pressure and is less than the target pressure to generate an intermediate supercritical fluid, a cooling portion which cools the intermediate supercritical fluid generated by the compression portion to a temperature near to a critical temperature to generate an intermediate supercritical pressure liquid, a pump portion which boosts the intermediate supercritical pressure liquid generated by the cooling portion to a pressure which is equal to or greater than the target pressure, and a cooling temperature adjusting portion which adjusts a temperature of the intermediate supercritical pressure liquid generated by the cooling portion in an upstream side of a pump.

Claims

1. A boosting system which boosts a target gas to a pressure which is equal to or greater than a target pressure higher than a critical pressure, comprising:

a compression portion which compresses the target gas to an intermediate pressure which is equal to or greater than the critical pressure and is less than the target pressure to generate an intermediate supercritical fluid;

a cooling portion which cools the intermediate supercritical fluid generated by the compression portion to a temperature near to a critical temperature to generate an intermediate supercritical pressure liquid;

a pump portion which boosts the intermediate supercritical pressure liquid generated by the cooling portion to a pressure which is equal to or greater than the target pressure; and

a cooling temperature adjusting portion which adjusts a temperature of the intermediate supercritical pressure liquid generated by the cooling portion using a cooling medium in an upstream side of the pump portion.

2. The boosting system according to claim 1, further comprising:

a heating portion which heats the intermediate supercritical pressure liquid boosted by the pump portion to a temperature near to the critical temperature and generates a target supercritical fluid,

wherein the cooling portion includes a main cooling portion which performs heat exchange between the heating portion and the main cooling portion to cool the intermediate supercritical fluid.

3. The boosting system according to claim 1 or 2,

wherein the cooling temperature adjusting portion extracts a portion of the intermediate supercritical fluid generated by the compression portion and uses the extracted fluid as the cooling medium.

4. The boosting system according to any one of claims 1 to 3,

wherein the cooling temperature adjusting portion adjusts a flow rate of the cooling medium which is supplied to the cooling portion.

5. The boosting system according to claim 2, further comprising:

a pressure detection portion which detects a pressure of the target supercritical fluid,

wherein the cooling temperature adjusting portion includes a flow rate adjusting portion which adjusts a flow rate of the cooling medium supplied to the cooling portion, and

a control portion which controls the flow rate adjusting portion based on a detection value detected by the pressure detection portion,

wherein the control portion includes a determination portion which determines whether or not the detection value belongs to a predetermined pressure range, and

a flow rate determination portion which determines a flow rate adjusted by the flow rate adjusting portion, based on a determination result of the determination portion.

6. The boosting system according to claim 5,

wherein the cooling temperature adjusting portion extracts a portion of the intermediate supercritical fluid generated by the compression portion and uses the extracted fluid as the cooling medium.

7. A boosting method of gas which boosts a target gas to a pressure which is equal to or greater than a target pressure higher than a critical pressure, comprising:

a compression step of compressing the target gas to an intermediate pressure which is equal to or greater than the critical pressure and is less than the target pressure to generate an intermediate supercritical fluid;

a cooling step of cooling the intermediate supercritical fluid generated in the compression step to a temperature near to a critical temperature to generate an intermediate supercritical pressure liquid;

a cooling temperature adjusting step of adjusting a temperature of the intermediate supercritical pressure liquid generated in the cooling step; and

a pumping step of boosting the intermediate supercritical pressure liquid generated in the cooling step to a pressure which is equal to or greater than the target pressure,

wherein in the cooling step, the intermediate supercritical fluid is cooled using at least one of the intermediate supercritical pressure liquid boosted in the pumping step, a low-temperature liquid which is generated by extracting the intermediate supercritical pressure liquid before the pumping step starts and decompressing the extracted liquid to a pressure near to the critical pressure, and an external cooling medium, as a cooling medium.