US3823693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed heat exchanger
Assignee: Environmental Protection Agency
•
Filing: 1973-01-16
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Granted: 1974-07-16
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Expires: 1993-01-16
Abstract
Abstract A vapor generator in which a plurality of vertically stacked beds of particulate material containing a solid fuel are disposed in a housing. Air is passed through each of the fuel beds to promote the combustion of the fuel and maintain the beds at predetermined temperatures while a heat exchange medium is circulated in a heat exchange relation to the beds.
Inventors
- 👤 R Bryers
- 👤 J Shenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:38
CPC Classifications
F; F22; F22B; F22B17/00; F22B17/10; F22B17/105; F22B31/00; F22B31/0007; F22B31/0015; F22B31/003; F22B31/0038
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A heat exchanger comprising a housing, a plurality of vertically spaced beds of particulate fuel material disposed in said housing and defining a plurality of heat zones, means for passing air through each of said fuel beds to promote the combustion of said fuel and maintain said heat zones at predetermined temperatures, and means for successively passing a heat exchange medium upwardly through said heat zones in a heat exchange relation to said fuel beds to gradually raise the temperature of said medium.
Claim 2
Dependent Claim
83 words
A heat exchanger comprising a housing, a plurality of vertically spaced beds of particulate fuel material disposed in said housing and defining a plurality of heat zones, means for passing air through each of said fuel beds to promote the combustion of said fuel and maintain said heat zones at predetermined temperatures, and means for successively passing a heat exchange medium upwardly through said heat zones in a heat exchange relation to said fuel beds to gradually raise the temperature of said medium.
Claim 3
Dependent Claim
27 words
The heat exchanger of claim 1 wherein each wall of said housing is formed by a plurality of continuous finned tubes for circulating said heat exchange medium.
Claim 4
Dependent Claim
33 words
The heat exchanger of claim 1 further comprising means to selectively direct said medium through at least one of said fuel beds after it has passed upwardly through all of said heat zones.
Claim 5
Dependent Claim
34 words
The heat exchanger of claim 3 wherein said medium is water, said water being partially evaporated during passage through said heat zones and being completely evaporated into steam during passage through said fuel bed.
Claim 6
Dependent Claim
26 words
The heat exchanger of claim 4 further comprising means to selectively direct said steam through at least one of said fuel beds to superheat the steam.
Claim 7
Dependent Claim
28 words
The heat exchanger of claim 1 further comprising means to direct said medium outwardly from and back into said housing after it has passed through said heat zones.
Claim 8
Dependent Claim
54 words
The heat exchanger of claim 1 wherein said air combines with the combustion products from said fuel beds as it passes through said fuel beds to form a heated gas, and further comprising means to direct said heated gas in a heat exchange relation to said air before it passes through said fuel beds.
Claim 9
Dependent Claim
45 words
The heat exchanger of claim 7 wherein a portion of said fuel material is entrained in said gas, and further comprising means to separate said portion of fuel material from said gas and direct said portion of fuel material to one of said fuel beds.
Claim 10
Dependent Claim
17 words
The heat exchanger of claim 1 wherein said heat zones are located immediately above their respective beds.
References Cited (Backward Citations)
US2818049A
Cited
US2842102A
Cited
US2983259A
Cited
US3119378A
Cited
US3431892A
Cited
US3659559A
Cited
US3648666A
Cited
US3736908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |