US4282926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of fluid streams
Assignee: James Howden Australia Pty Ltd
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Filing: 1979-02-22
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Granted: 1981-08-11
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Expires: 1999-02-22
Abstract
Abstract A method and apparatus for cooling a fluid stream, especially flue gases produced in large volumes in industrial processes. Heat is dumped from the gas stream via the medium of a circulating fluid which is evaporated by a gas stream and then recondensed as it dumps its acquired heat. The fluid is chosen and the rate of recondensation is controlled so that the liquid phase is at a selected saturation temperature which is then the interface temperature in the gas stream.
Inventors
- 👤 Kenneth B. D. Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:56
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/0266
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
242 words
A method for cooling a gas stream in a manner to provide a time lag between a failure of a cooling fluid supply and a consequent rise in the discharge temperature of the said gas stream comprising: passing the gas stream through a duct into heat exchange relationship with the liquid phase of a secondary fluid in a primary heat exchanger whereby to vaporize the liquid; recondensing the vaporized secondary fluid by passing it through a secondary heat exchanger into heat exchange relationship with a third fluid which is introduced into the secondary heat exchanger at ambient temperature and which exits therefrom without having undergone a phase change; allowing the secondary fluid to circulate between the primary and secondary heat exchangers substantially without loss of the secondary fluid unless the pressure of the secondary fluid exceeds a predetermined value which is above atmospheric pressure, the secondary fluid being substantially in the vapor phase when passing from the primary to the secondary heat exchanger and being substantially in the liquid phase when travelling from the secondary to the primary heat exchanger; the secondary fluid being so chosen and the rate of condensation in the secondary heat exchanger being so controlled that the pressure of the secondary fluid is normally maintained below the said predetermined value; and, in the event that the third fluid stream fails, venting the vaporized secondary fluid to maintain the pressure of the secondary fluid below the said predetermined value.
Claim 2
Independent Claim
242 words
A method for cooling a gas stream in a manner to provide a time lag between a failure of a cooling fluid supply and a consequent rise in the discharge temperature of the said gas stream comprising: passing the gas stream through a duct into heat exchange relationship with the liquid phase of a secondary fluid in a primary heat exchanger whereby to vaporize the liquid; recondensing the vaporized secondary fluid by passing it through a secondary heat exchanger into heat exchange relationship with a third fluid which is introduced into the secondary heat exchanger at ambient temperature and which exits therefrom without having undergone a phase change; allowing the secondary fluid to circulate between the primary and secondary heat exchangers substantially without loss of the secondary fluid unless the pressure of the secondary fluid exceeds a predetermined value which is above atmospheric pressure, the secondary fluid being substantially in the vapor phase when passing from the primary to the secondary heat exchanger and being substantially in the liquid phase when travelling from the secondary to the primary heat exchanger; the secondary fluid being so chosen and the rate of condensation in the secondary heat exchanger being so controlled that the pressure of the secondary fluid is normally maintained below the said predetermined value; and, in the event that the third fluid stream fails, venting the vaporized secondary fluid to maintain the pressure of the secondary fluid below the said predetermined value.
Claim 3
Dependent Claim
52 words
A method as claimed in claim 1 in which the secondary fluid travels from the primary heat exchanger to the secondary heat exchanger through a first laterally confined discrete conduit or group of conduits and returns to the primary heat exchanger through a second laterally confined discrete conduit or group of conduits.
Claim 4
Dependent Claim
22 words
A method according to claim 1 in which the secondary heat exchanger is positioned above the location of the primary heat exchanger.
Claim 5
Dependent Claim
253 words
Apparatus for cooling a gas stream in a manner to provide a time lag between a failure of a cooling fluid supply and a consequent rise in the discharge temperature of the said gas stream comprising: a duct for confining the gas stream; primary heat exchanger disposed in the said duct for guiding the liquid phase of a secondary fluid into heat exchange relationship with said gas stream to permit vaporization of the liquid phase by said stream; secondary heat exchanger to bring the vapor phase of the secondary fluid into heat exchange relationship with a third fluid which enters the secondary heat exchanger at ambient temperature and does not undergo a phase change while passing through the secondary heat exchanger; conduit means to carry the secondary fluid from the primary heat exchanger to the secondary heat exchanger in a vapor state and from the secondary heat exchanger to the primary heat exchanger in the liquid state substantially without loss of the secondary fluid unless the pressure of the secondary fluid exceeds a predetermined value which is above atmospheric pressure; and means to control the rate of condensation of the secondary fluid such that the pressure of the secondary fluid is normally below the said predetermined value and valve means to vent the secondary fluid from the secondary heat exchanger and/or from the said conduit means in the event that the flow of the third fluid in the secondary heat exchanger is insufficient to prevent the pressure thereof exceeding the said predetermined value.
Claim 6
Dependent Claim
253 words
Apparatus for cooling a gas stream in a manner to provide a time lag between a failure of a cooling fluid supply and a consequent rise in the discharge temperature of the said gas stream comprising: a duct for confining the gas stream; primary heat exchanger disposed in the said duct for guiding the liquid phase of a secondary fluid into heat exchange relationship with said gas stream to permit vaporization of the liquid phase by said stream; secondary heat exchanger to bring the vapor phase of the secondary fluid into heat exchange relationship with a third fluid which enters the secondary heat exchanger at ambient temperature and does not undergo a phase change while passing through the secondary heat exchanger; conduit means to carry the secondary fluid from the primary heat exchanger to the secondary heat exchanger in a vapor state and from the secondary heat exchanger to the primary heat exchanger in the liquid state substantially without loss of the secondary fluid unless the pressure of the secondary fluid exceeds a predetermined value which is above atmospheric pressure; and means to control the rate of condensation of the secondary fluid such that the pressure of the secondary fluid is normally below the said predetermined value and valve means to vent the secondary fluid from the secondary heat exchanger and/or from the said conduit means in the event that the flow of the third fluid in the secondary heat exchanger is insufficient to prevent the pressure thereof exceeding the said predetermined value.
Claim 7
Dependent Claim
51 words
Apparatus as claimed in claim 4 in which the conduit means comprise a first laterally confined discrete conduit or group of conduits for carrying the secondary fluid in the vapor phase and a second laterally confined discrete conduit or group of conduits for carrying the secondary fluid in the liquid phase.
Claim 8
Dependent Claim
24 words
Apparatus as claimed in claims 4 or 5 in which the secondary heat exchanger is positioned above the location of the primary heat exchanger.
References Cited (Backward Citations)
US1690108A
Cited
US1725906A
Cited
US1882750A
Cited
US1887807A
Cited
US1976462A
Cited
US2115548A
Cited
US2433547A
Cited
US3147742A
Cited
US3229759A
Cited
US3326278A
Cited
GB1222310A
Cited
GB1255114A
Cited
US3688838A
Cited
US3662542A
Cited
US3809154A
Cited
US3687612A
Cited
US3749158A
Cited
US3786861A
Cited
US4109705A
Cited
US4033406A
Cited
US4091547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |