Boosting system, and boosting method of gas

• US 10,570,927 B2
• Filed: 01/14/2014
• Issued: 02/25/2020
• 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
• Primary Examiner(s): Alosh, Tareq
• Application Number:
  US14/897,273
• Publication Number:
  US 20160123351A1
• Time in Patent Office: 2,233 Days
• 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, and generates a first intermediate supercritical fluid;

a cooling portion which cools the first intermediate supercritical fluid generated by the compression portion to a critical temperature in a state where the intermediate pressure is maintained, and generates a second intermediate supercritical fluid;

a pump portion which boosts the second intermediate supercritical fluid generated by the cooling portion to a pressure which is equal to or greater than the target pressure, and generates a third intermediate supercritical fluid; and

a cooling temperature adjusting portion which adjusts a temperature of the first intermediate supercritical fluid generated by the compression portion using a cooling medium in an upstream side of the pump portion,

wherein the cooling temperature adjusting portion extracts a portion of the second intermediate supercritical fluid as the cooling medium from between the cooling portion and the pump portion.

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

a heating portion which heats the third intermediate supercritical fluid boosted by the pump portion 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 first intermediate supercritical fluid.

3. The boosting system according to claim 1,

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

4. 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 within, or not within a predetermined pressure range, and

wherein 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.

5. 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, and generating a first intermediate supercritical fluid;

a cooling step of cooling the first intermediate supercritical fluid generated in the compression step to a critical temperature in a state where the intermediate pressure is maintained, and generating a second intermediate supercritical fluid;

a cooling temperature adjusting step of adjusting a temperature of the second intermediate supercritical fluid generated in the cooling step; and

a pumping step of boosting the second intermediate supercritical fluid generated in the cooling step to a pressure which is equal to or greater than the target pressure, and generating a third intermediate supercritical fluid,

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