US4907405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to cool gas
Assignee: Praxair Technology Inc
•
Filing: 1989-01-24
•
Granted: 1990-03-13
•
Expires: 2009-01-24
Abstract
Abstract A process which effectively uses steam produced by a cogeneration facility to cool gas wherein the steam is passed through an absorption chiller to cool water which in turn is used to cool the gas.
Inventors
- 👤 Robert J. Polizzotto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:29
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K17/00; F01K17/04; F25; F25J; F25J1/00; F25J1/0002; F25J1/0012; F25J1/0015; F25J1/02; F25J1/0225; F25J1/0227; F25J1/0228; F25J1/0234; F25J1/0235; F25J2240/00; F25J2240/70; F25J2240/80; F25J2240/82; F25J2270/00; F25J2270/90; F25J2270/906; Y; Y02; Y02E; Y02E20/00; Y02E20/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
82 words
Process to cool gas comprising: (A) combusting fuel and oxidant to produce elevated pressure hot gas; (B) expanding elevated pressure hot gas through a gas turbine for the production of external work; (C) passing expanded hot gas in heat exchange relation with elevated pressure water to produce high pressure steam and low pressure steam; (D) passing low pressure steam through an absorption chiller to cool liquid; and (E) passing cooled liquid in indirect heat exchange relation with gas to cool the gas.
Claim 2
Dependent Claim
82 words
Process to cool gas comprising: (A) combusting fuel and oxidant to produce elevated pressure hot gas; (B) expanding elevated pressure hot gas through a gas turbine for the production of external work; (C) passing expanded hot gas in heat exchange relation with elevated pressure water to produce high pressure steam and low pressure steam; (D) passing low pressure steam through an absorption chiller to cool liquid; and (E) passing cooled liquid in indirect heat exchange relation with gas to cool the gas.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the oxidant is compressed prior to the combustion of step (A).
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the oxidant is air.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the oxidant is oxygen-enriched air.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the oxidant is technically pure oxygen.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the external work produced in step (B) produces electricity.
Claim 8
Dependent Claim
20 words
The process of claim 2 wherein work produced in step (B) is employed to carry out compression of the oxidant.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the gas which undergoes cooling in step (E) is nitrogen.
Claim 10
Dependent Claim
22 words
The process of claim 1 further comprising pumping condensed exhaust from the adsorption chiller to form elevated pressure water of step (C).
Claim 11
Dependent Claim
16 words
The process of claim 1 further comprising condensing gas cooled in step (E) to form liquid.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the gas to be cooled in step (E) is taken from an air separation plant.
Claim 13
Dependent Claim
23 words
The process of claim 11 wherein oxygen produced by the air separation plant forms at least some of the oxidant of step (A).
Claim 14
Dependent Claim
34 words
The process of claim 11 wherein at least some of the external work produced in step (B) produces electricity and at least some of this electricity is used to operate the air separation plant.
Claim 15
Dependent Claim
14 words
The process of claim 1 wherein the liquid cooled in step (D) is water.
Claim 16
Dependent Claim
21 words
The process of claim 1 further comprising passing high pressure steam through a steam turbine for the production of external work.
Claim 17
Dependent Claim
23 words
The process of claim 15 wherein the external work produced by the passage of high pressure steam through the steam turbine produces electricity.
Claim 18
Dependent Claim
22 words
The process of claim 15 further comprising passing some of the steam which passes through the steam turbine through the absorption chiller.
Claim 19
Dependent Claim
25 words
The process of claim 15 further comprising condensing exhaust from the steam turbine and pumping condensed exhaust to form elevated pressure water of step (C).
References Cited (Backward Citations)
US2322717A
Cited
US2339185A
Cited
US2548508A
Cited
US3394555A
Cited
US3796045A
Cited
US4424668A
Cited
US4841722A
Cited
US4793132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |