Patent US4385568A successfully refreshed from Google Patents.
US4385568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid fuel furnace
Assignee: KERR CONTROLS Ltd A BODY CORPORATE OF NOVA SCOTIA
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Filing: 1980-12-01
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Granted: 1983-05-31
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Expires: 2000-12-01
Abstract
Abstract A solid fuel burning device having a combustion chamber and a heat exchange chamber. The two chambers are joined by a tunnel composed of refractory material through which hot flue gases pass from the combustion chamber to the heat exchange chamber, causing the tunnel walls to be heated to the point of incandescence. As the flue gases pass through the tunnel there is a substantial reduction in uncombusted material by pyrolysis. The tunnel has an outside wall adopted to transmit energy by radiation.
Inventors
- 👤 David Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:44
CPC Classifications
F; F23; F23B; F23B5/00; F23B5/04; F24; F24H; F24H1/00; F24H1/22; F24H1/34; F24H1/36; F24H2230/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
Apparatus for burning solid materials comprising a combustion chamber; a fuel chamber situated above said combustion chamber and communicating therewith by way of an opening in the top of said combustion chamber; a heat exchange chamber situated laterally of said combustion chamber, said heat exchange chamber including a heat exchange means; (and) a tunnel connecting said combustion chamber to said heat exchange chamber, said tunnel being adapted to conduct flue gases from said combustion chamber to said heat exchange chamber, said tunnel being adapted to cause secondary combustion in said gases during passage therethrough, said tunnel including walls having inside and outside surfaces, at least a portion of said passage being situated in said heat exchange chamber; at least one said wall being adapted to transmit energy from the outside thereof to said heat exchange means, by radiation.
Claim 2
Dependent Claim
138 words
Apparatus for burning solid materials comprising a combustion chamber; a fuel chamber situated above said combustion chamber and communicating therewith by way of an opening in the top of said combustion chamber; a heat exchange chamber situated laterally of said combustion chamber, said heat exchange chamber including a heat exchange means; (and) a tunnel connecting said combustion chamber to said heat exchange chamber, said tunnel being adapted to conduct flue gases from said combustion chamber to said heat exchange chamber, said tunnel being adapted to cause secondary combustion in said gases during passage therethrough, said tunnel including walls having inside and outside surfaces, at least a portion of said passage being situated in said heat exchange chamber; at least one said wall being adapted to transmit energy from the outside thereof to said heat exchange means, by radiation.
Claim 3
Dependent Claim
17 words
Apparatus according to claim 1 wherein said walls of said tunnel are composed of a refractory material.
Claim 4
Dependent Claim
71 words
Apparatus according to claim 2 including a wall between said heat exchange chamber and said combustion chamber having an opening therein, said tunnel being in communication with said opening in said wall between said heat exchange chamber and said combustion chamber, said walls of said tunnel being adapted to become incandescent during operation thereby providing a high temperature atmosphere within said tunnel to cause continued combustion of the flue gases therein.
Claim 5
Dependent Claim
27 words
Apparatus according to claim 1, 2 or 3 including means for directing flue gases emerging from said tunnel against at least one of said outside wall surfaces.
Claim 6
Dependent Claim
43 words
Apparatus according to claim 2 wherein said tunnel includes an exit which is oriented so as to cooperate with said heat exchange chamber wall surface to direct flue gases emerging from said exit into contact with the outside surfaces of said tunnel walls.
Claim 7
Dependent Claim
17 words
Apparatus according to claim 2 including means for supplying air above atmospheric pressure to said combustion chamber.
Claim 8
Dependent Claim
51 words
Apparatus according to claim 1, 2 or 3 including an air supply source, said air supply source being adapted to supply air to a draft device and to supply air through a pipe passing through the heat exchange chamber to the combustion chamber thereby providing preheated air to the combustion chamber.
Claim 9
Dependent Claim
47 words
Apparatus according to claim 1, 2 or 3 wherein the dimensions of said tunnel and the pressure differential along the length of said tunnel, permit the flue gases to dwell in the tunnel for a sufficient period of time to effect additional combustion of uncombusted materials therein.
Claim 10
Dependent Claim
19 words
Apparatus according to claim 1 wherein said tunnel is positioned below said heat exchanger in said heat exchange chamber.
Claim 11
Dependent Claim
19 words
Apparatus according to claim 1, 2 or 3 including a draft means for assisting movement of said flue gases.
Claim 12
Dependent Claim
21 words
Apparatus according to claim 1 or 2 wherein said tunnel slants downward in the direction of travel of said flue gases.
Claim 13
Dependent Claim
15 words
Apparatus according to claim 1 or 2 wherein said fuel chamber is surrounded by water.
References Cited (Backward Citations)
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Cited
US1896252A
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US3866551A
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US3930802A
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US4102279A
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US4309965A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |