US4182245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the combustion of crushed solid fuels
Assignee: CONCRETE INDUSTRIES (AUSTRALIA) Ltd
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Filing: 1978-03-15
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Granted: 1980-01-08
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Expires: 1998-03-15
Abstract
Abstract A method for the combustion of crushed solid fuel comprising crushing the fuel into a powder form, placing the crushed fuel into a storage bin and fluidizing the fuel within the bin, passing the fluid fuel through a de-airing pipe to partially compact the fuel, advancing the partially compacted fuel into a mixing chamber, passing regular pulses of compressed air through the mixing chamber so as to form a vena contracta in the mixing chamber thereby inducing the flow of partially compacted fuel into the compressed air and causing the mixture of fuel and compressed air to flow into a kiln or furnace.
Inventors
- 👤 Alan G. Stewart
- 👤 John Whiteford
- 👤 William J. Emmett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
F; F23; F23D; F23D1/00; F23K; F23K1/00; F23K3/00; F23K3/02; F23N; F23N3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
A method for the combustion of crushed solid fuel comprising crushing the fuel into a powder form, placing the crushed fuel into a storage bin and fluidizing said fuel within said bin, passing the fluid fuel through a de-airing pipe to partially compact the fuel, advancing the partially compacted de-aired fuel into a mixing chamber, passing a flow of constantly pulsing compressed air through the mixing chamber so as to form a vena-contracta in said mixing chamber thereby inducing the flow of partially compacted de-aired fuel into the compressed air and causing the mixture of de-aired fuel and compressed air to flow into a kiln or furnace, the combination of the pulsed air flow and the feed of the partially compacted de-aired fuel thereinto from the de-airing pipe being effective to insure regular flow of the de-aired fuel through the de-airing pipe to said mixing chamber and regular pulses of compressed air and de-aired fuel through the vena contracta to the kiln or furnace.
Claim 2
Independent Claim
164 words
A method for the combustion of crushed solid fuel comprising crushing the fuel into a powder form, placing the crushed fuel into a storage bin and fluidizing said fuel within said bin, passing the fluid fuel through a de-airing pipe to partially compact the fuel, advancing the partially compacted de-aired fuel into a mixing chamber, passing a flow of constantly pulsing compressed air through the mixing chamber so as to form a vena-contracta in said mixing chamber thereby inducing the flow of partially compacted de-aired fuel into the compressed air and causing the mixture of de-aired fuel and compressed air to flow into a kiln or furnace, the combination of the pulsed air flow and the feed of the partially compacted de-aired fuel thereinto from the de-airing pipe being effective to insure regular flow of the de-aired fuel through the de-airing pipe to said mixing chamber and regular pulses of compressed air and de-aired fuel through the vena contracta to the kiln or furnace.
Claim 3
Dependent Claim
39 words
A method for the combustion of crushed solid fuel as claimed in claim 1 comprising controlling the flow of compressed air to said mixing chamber by a solenoid valve, and operating said solenoid valve by a pre-set controlling device.
Claim 4
Dependent Claim
24 words
A method for the combustion of crushed solid fuel as claimed in claim 1 wherein the compressed air is at 20 to 100 p.s.i.
Claim 5
Dependent Claim
48 words
A method for the combustion of crushed solid fuel as claimed in claim 1 wherein said compressed air is discharged into said mixing chamber through a nozzle and then into a venturi forming said vena contracta, the fuel being supplied to the compressed air at said vena contracta.
Claim 6
Dependent Claim
32 words
A method for the combustion of crushed solid fuel as claimed in claim 1 wherein said fuel is crushed to a size capable of passing through a 14 B.S.S. Mesh or Sieve.
Claim 7
Dependent Claim
30 words
A method for the combustion of crushed solid fuel as claimed in claim 1 wherein the partially compacted fuel is passed to said mixing chamber through an electrically conductive pipe.
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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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |