US3815882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverberatory furnace using waste gas for combustion
Assignee: Combustion Engineering Inc
•
Filing: 1972-12-15
•
Granted: 1974-06-11
•
Expires: 1992-12-15
Abstract
Abstract This disclosure involves a reverberatory furnace installation including a steam generating system in which auxiliary steam for the process is superheated in a separately fired superheater and a method of operating the same. Excess air is employed in the combustion process within the superheater and the exhaust gas therefrom passed directly into the reverberatory furnace for use in the combustion and reduction processes therein. Superheat temperatures of the steam are controlled by regulating the amount of air supplied to the burners of the superheater.
Inventors
- 👤 J Regan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:07
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/26; F27D; F27D17/00; F27D17/10; F27D17/15
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
A process for the reduction of metal ores in a reverberatory furnace in a system in which the waste gas from the furnace is cooled in a boiler to generate steam and the steam superheated in a separately fired superheater, said reverberatory furnace and said superheater each having burners the fuel supplies to each being mutually independent, comprising the steps of: a. supplying total air to the system in an amount sufficient to satisfy the demands of the ore reduction process in the reverberatory furnace; b. supplying fuel to the reverberatory furnace burner in an amount to create gas temperatures sufficient to reduce the ore in the reverberatory furnace; c. supplying fuel to the superheater burner to provide the desired air-gas mixture temperature for burning fuel from said reverberatory furnace burner; d. passing part of the air to the superheater in an amount in excess of that required for complete combustion of the fuel supplied to said superheater burner; e. mixing the heated air-gas mixture from said superheater with the remaining part of the air; and f. passing the resultant mixture serially into the reverberatory furnace for use in the reduction of ore therein and thence to said boiler.
Claim 2
Dependent Claim
199 words
A process for the reduction of metal ores in a reverberatory furnace in a system in which the waste gas from the furnace is cooled in a boiler to generate steam and the steam superheated in a separately fired superheater, said reverberatory furnace and said superheater each having burners the fuel supplies to each being mutually independent, comprising the steps of: a. supplying total air to the system in an amount sufficient to satisfy the demands of the ore reduction process in the reverberatory furnace; b. supplying fuel to the reverberatory furnace burner in an amount to create gas temperatures sufficient to reduce the ore in the reverberatory furnace; c. supplying fuel to the superheater burner to provide the desired air-gas mixture temperature for burning fuel from said reverberatory furnace burner; d. passing part of the air to the superheater in an amount in excess of that required for complete combustion of the fuel supplied to said superheater burner; e. mixing the heated air-gas mixture from said superheater with the remaining part of the air; and f. passing the resultant mixture serially into the reverberatory furnace for use in the reduction of ore therein and thence to said boiler.
Claim 3
Dependent Claim
49 words
A process in accordance with claim 1 in which total air is supplied to the system by a single fan and including the step of splitting the air flow therefrom into one part that is supplied to the superheater and another part that is passed in bypass relation thereto.
Claim 4
Dependent Claim
29 words
A process in accordance with claim 2 including the step of regulating the steam outlet temperature from the superheater by proportioning the flow of air in the respective parts.
Claim 5
Dependent Claim
145 words
In a system for reducing metal ores and for recovering heat generated in the process by generating and superheating steam, the combination of: a. a reverberatory furnace having a fuel burner to generate heat for the reduction of said metal ores; b. a waste heat boiler connected in downstream series relation in the gas flow sense with said reverberatory furnace; c. a superheater having a fuel burner operatively disposed therein connected in upstream series relation in the gas flow sense with said reverberatory furnace; d. means for supplying combustion air to said system including: i. means for supplying part of said combustion air to said superheater for combustion therein, ii. means for supplying another part of said combustion air to the gas flow stream intermediate said superheater and said reverberatory furnace, and iii. means for controlling the flow of combustion air in the respective parts.
Claim 6
Dependent Claim
145 words
In a system for reducing metal ores and for recovering heat generated in the process by generating and superheating steam, the combination of: a. a reverberatory furnace having a fuel burner to generate heat for the reduction of said metal ores; b. a waste heat boiler connected in downstream series relation in the gas flow sense with said reverberatory furnace; c. a superheater having a fuel burner operatively disposed therein connected in upstream series relation in the gas flow sense with said reverberatory furnace; d. means for supplying combustion air to said system including: i. means for supplying part of said combustion air to said superheater for combustion therein, ii. means for supplying another part of said combustion air to the gas flow stream intermediate said superheater and said reverberatory furnace, and iii. means for controlling the flow of combustion air in the respective parts.
Claim 7
Dependent Claim
34 words
The combination as recited in claim 4 in which the part of said combustion air supplied to said superheater is in excess of the amount necessary to support combustion of the fuel supplied thereto.
Claim 8
Dependent Claim
83 words
The combination as recited in claim 4 in which said means for supplying combustion air to said system includes: a. a fan operative to supply total combustion air to said system; b. a first duct interconnecting said fan and said superheater; c. a second duct interconnecting said fan and said gas flow stream intermediate said superheater and said reverberatory furnace; and d. damper means operative in at least one of said ducts for controlling the flow of combustion air in the respective parts.
Claim 9
Dependent Claim
22 words
The combination as recited in claim 6 in which said damper means comprises a single damper operatively disposed in said second duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |