US3689041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating steel ingots soaking pits and combustion system for performing said method
Assignee: Individual
•
Filing: 1970-11-10
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Granted: 1972-09-05
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Expires: 1990-11-10
Abstract
Abstract In a soaking furnace for heating metal parts, a burner works at full power during a heating-up period and at reduced power during a soaking period. Combustion gases are fed into the furnace with such velocity that the resulting turbulence causes uniform temperature distribution. When the burner is operated at reduced power, the total amount of fuel and air supplied is reduced but the speed of admission to the furnace is increased to maintain turbulence and uniform temperature distribution. The burner includes two concentric parts connected separately to common fuel air manifolds so that one part may be switched off thereby causing higher rate of flow to the other burner part.
Inventors
- 👤 Carlo Pere
- 👤 Fulvio Tornich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
F; F23; F23D; F23D14/00; C; C21; C21D; C21D9/00; C21D9/70; F23D14/46; F23D14/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A soaking furnace including furnace walls enclosing a furnace space to contain an ingot to be treated and a burner arrangement connected thereto, comprising at least two burners, each of which is provided with a fuel supply pipe and an air supply pipe, and control means controlled automatically in dependence on the temperature in the furnace space for throttling the air and fuel supply pipes of one burner and causing simultaneous corresponding increase of pressure in the air and fuel supply pipes of the other burner at least in the initial portion of the soaking period, the ratio of fuel to air for combustion remaining constant for both burners.
Claim 2
Dependent Claim
109 words
A soaking furnace including furnace walls enclosing a furnace space to contain an ingot to be treated and a burner arrangement connected thereto, comprising at least two burners, each of which is provided with a fuel supply pipe and an air supply pipe, and control means controlled automatically in dependence on the temperature in the furnace space for throttling the air and fuel supply pipes of one burner and causing simultaneous corresponding increase of pressure in the air and fuel supply pipes of the other burner at least in the initial portion of the soaking period, the ratio of fuel to air for combustion remaining constant for both burners.
Claim 3
Dependent Claim
35 words
A burner arrangement according to claim 1, in which the two burners are combined in a common burner head and are disposed coaxially around one another with concentric annular outlet nozzles for fuel and air.
Claim 4
Dependent Claim
65 words
A burner arrangement according to claim 2, in which on the one hand the air supply pipes and on the other hand the fuel supply pipes of the two burners are each connected by an air manifold and a fuel manifold to common air and fuel blowers, and that the air and fuel supply pipes of one burner are provided with simultaneously operable throttle elements.
Claim 5
Dependent Claim
60 words
A burner arrangement according to claim 3, in which the throttle element in the air supply pipe of one burner is controlled by a control device responding to the temperature in the furnace space and the throttle element in the fuel supply pipe of the same burner is controlled by a controller maintaining an adjusted ratio of fuel to air.
Claim 6
Dependent Claim
51 words
A burner arrangement according to claim 4, in which the air and fuel manifolds common to the two burners are each provided with a throttle element downstream of the respective air and fuel blowers, and these throttle elements can be operated simultaneously while retaining the same ratio of fuel to air.
Claim 7
Dependent Claim
59 words
A burner arrangement according to claim 5, in which the throttle element in the air manifold is controlled by a control device responding to the temperature in the furnace space or to the temperature of the furnace charge, and the throttle element in the fuel manifold is controlled by a controller maintaining an adjusted ratio of fuel to air.
Claim 8
Dependent Claim
26 words
A burner arrangement according to claim 6, in which the said control device has a temperature sensor responding to the temperature of the furnace space walls.
Claim 9
Dependent Claim
46 words
A burner arrangement according to claim 7, in which the said controller for maintaining the adjusted ratio of fuel to air for combustion is provided with two measuring instruments responding to the flow and disposed in the suction pipes of the air and fuel blowers respectively.
Claim 10
Independent Claim
120 words
A method of heating metal ingots in a soaking furnace of the type including a pair of concentric burners having separate individual fuel and air supply systems, the steps of heating the soaking furnace walls to a temperature of the maximum permissible surface temperature of the metal ingot by initially operating both burners at their maximum capacity producing an intense turbulence of the combustion gases in the furnace space, reducing the total fuel and air supplied to the burners during a soaking period while simultaneously increasing the speed of admission of the fuel and air for combustion into the furnace space to an extent such that the turbulence of the combustion gases in the furnace space does not initially decrease.
Claim 11
Independent Claim
120 words
A method of heating metal ingots in a soaking furnace of the type including a pair of concentric burners having separate individual fuel and air supply systems, the steps of heating the soaking furnace walls to a temperature of the maximum permissible surface temperature of the metal ingot by initially operating both burners at their maximum capacity producing an intense turbulence of the combustion gases in the furnace space, reducing the total fuel and air supplied to the burners during a soaking period while simultaneously increasing the speed of admission of the fuel and air for combustion into the furnace space to an extent such that the turbulence of the combustion gases in the furnace space does not initially decrease.
Claim 12
Dependent Claim
70 words
The method of claim 9 wherein the steps of reducing the total fuel and air supplied to the burners while simultaneously increasing the speed of admission of the fuel and air for combustion into the furnace space includes the steps of reducing the fuel and air supplied through one of said burners while simultaneously increasing the speed of admission of the fuel and air through the other of said burners.
References Cited (Backward Citations)
US2543388A
Cited
US2776827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |