US4056069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of burning refuse
Assignee: Imperial Metal Industries Kynoch Ltd
•
Filing: 1976-03-23
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Granted: 1977-11-01
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Expires: 1996-03-23
Abstract
Abstract A method of burning refuse to obtain heat which comprises injecting refuse through the back wall of a coal-fired moving grate furnace so that the refuse is burnt either in flight or falls onto the moving bed of coal and is burned with the coal.
Inventors
- 👤 John Edward Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/02; F23C; F23C1/00; F23C1/06; F23G; F23G5/00; F23G5/002; F23G5/004
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
126 words
A method of burning refuse including the steps of establishing a substantially uniform bed of burning coal on a moving grate floor, the bed of burning coal being located at the lower end of a combustion chamber, and entraining refuse in particulate form in a gas jet directed into the combustion chamber through the back wall of the combustion chamber in the opposite direction to the direction of movement of the grate, the velocity of the gas jet being such that the heavier particles are projected towards the front of the bed of coal, to fall onto the moving bed of coal and to be burned with the coal, while the lighter particles of the refuse are burned in suspension above the moving bed of coal.
Claim 2
Independent Claim
126 words
A method of burning refuse including the steps of establishing a substantially uniform bed of burning coal on a moving grate floor, the bed of burning coal being located at the lower end of a combustion chamber, and entraining refuse in particulate form in a gas jet directed into the combustion chamber through the back wall of the combustion chamber in the opposite direction to the direction of movement of the grate, the velocity of the gas jet being such that the heavier particles are projected towards the front of the bed of coal, to fall onto the moving bed of coal and to be burned with the coal, while the lighter particles of the refuse are burned in suspension above the moving bed of coal.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1 in which the bed of coal is thoroughly alight and burning before the bed is moved into an area in which the refuse can land on the bed.
Claim 4
Dependent Claim
40 words
A method as claimed in claim 2 in which the refuse is burned in a furnace having an arch over the inlet end of the grate, and in which the coal is thoroughly alight and burning before leaving the arch.
Claim 5
Dependent Claim
18 words
A method as claimed in claim 1 in which the gas jet is directed parallel to the grate.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1 in which there is a secondary classifying air jet directed up at the moving stream of refuse inside the combustion chamber.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 5 in which the classifying gas jet is provided at substantially the same pressure as the air jet which entrains the refuse.
Claim 8
Dependent Claim
16 words
A method as claimed in claim 1 in which the grate is a moving chain grate.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 1 in which there is an air feed through the moving grate floor.
Claim 10
Dependent Claim
39 words
A method as claimed in claim 1 in which the refuse has a particle size distribution such that 80% of the refuse has an average diameter of less than 5 cm, and is treated to remove the magnetic particles.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 1 in which there is a 50% excess of air supplied to the combustion chamber compared to that theoretically required to fully oxidise the coal and refuse.
Claim 12
Dependent Claim
27 words
A method as claimed in claim 1 in which refuse supplies in the region of 25% to 75% of the total heat input to the combustion chamber.
Claim 13
Dependent Claim
56 words
A method as claimed in claim 5 in which the gas jet which entrains the refuse is air and provides 5 to 15% of the total air volume supplied to the combustion chamber and in which the secondary classifying air jet also supplies 5 to 15% of the total air volume supplied to the combustion chamber.
Claim 14
Dependent Claim
14 words
A method as in claim 1 wherein the gas jet is an air jet.
Claim 15
Independent Claim
163 words
A method of burning refuse which comprises establishing a substantially uniform bed of burning coal on a grate floor which moves generally horizontally in the lower end of a combustion chamber in a direction away from a front wall of the chamber toward a back wall of the chamber, passing air upwardly through the grate, injecting the refuse in particulate form entrained in a stream of air into the combustion chamber at a location near the back wall of the chamber and above the bed in a direction opposite to the direction of movement of the grate, directing a classifying air stream up at the entrained refuse as it passes over the bed, the air streams acting together to project heavier particles of refuse above the bed and so as to fall onto the bed near the front wall of the combustion chamber and to suspend lighter particles of refuse in the combustion chamber above the bed so that they burn in suspension.
Claim 16
Independent Claim
163 words
A method of burning refuse which comprises establishing a substantially uniform bed of burning coal on a grate floor which moves generally horizontally in the lower end of a combustion chamber in a direction away from a front wall of the chamber toward a back wall of the chamber, passing air upwardly through the grate, injecting the refuse in particulate form entrained in a stream of air into the combustion chamber at a location near the back wall of the chamber and above the bed in a direction opposite to the direction of movement of the grate, directing a classifying air stream up at the entrained refuse as it passes over the bed, the air streams acting together to project heavier particles of refuse above the bed and so as to fall onto the bed near the front wall of the combustion chamber and to suspend lighter particles of refuse in the combustion chamber above the bed so that they burn in suspension.
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |