US4545208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating an industrial furnace
Assignee: EOn Ruhrgas AG
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Filing: 1983-06-25
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Granted: 1985-10-08
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Expires: 2003-06-25
Abstract
Abstract The disclosure relates to a method of operating an industrial furnace which is heated by recuperator burners from which the exhaust gases are extracted via steam jet injectors. The exhaust gas-steam mixture from the steam jet injectors passes into a waste heat boiler in order to produce water vapor. This water vapor is delivered to the steam jet injectors in order to drive them. When water vapor is produced in excess, preliminary expansion can be carried out in a turbine in order to generate useful energy. Such conditions are produced in particular when the industrial furnace operates with a steam generating water cooling system for parts of the furnace which become hot. The resulting water vapor is then also led through the waste heat boiler. The useful energy occurring in the turbine can serve to drive the blower for the combustion air for the recuperator burners.
Inventors
- 👤 Friedhelm Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:52
CPC Classifications
F; F27; F27D; F27D7/00; F27D7/02; F27B; F27B17/00; F23; F23L; F23L17/00; F23L17/16; F27D17/00; F27D17/10; F27D17/15; Y; Y02; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
58 words
The method of operating an industrial furnace which is heated by recuperator burners from which the exhaust gases are extracted via injectors, comprising: extracting the exhaust gases from said burners via steam injectors, exhausting the exhaust gas-steam mixture through a waste heat boiler to produce water vapor therein, and supplying said water vapor to drive said steam injectors.
Claim 2
Independent Claim
58 words
The method of operating an industrial furnace which is heated by recuperator burners from which the exhaust gases are extracted via injectors, comprising: extracting the exhaust gases from said burners via steam injectors, exhausting the exhaust gas-steam mixture through a waste heat boiler to produce water vapor therein, and supplying said water vapor to drive said steam injectors.
Claim 3
Dependent Claim
36 words
The method of claim 1, further comprising the step of passing said exhaust gas-steam mixture from said waste heat boiler through a condensate separator where said mixture gives up further heat to fresh water flowing therethrough.
Claim 4
Dependent Claim
45 words
The method of claim 1 wherein said industrial furnace further includes a steam generating water cooling system for parts of the furnace that become hot, said method further comprising the step of supplying said waste heat boiler with the steam generated by said cooling system.
Claim 5
Dependent Claim
32 words
The method of claim 3 further comprising the step of expanding said water vapor generated in said waste heat boiler in a turbine before it serves to drive said steam jet injectors.
Claim 6
Dependent Claim
32 words
The method of claim 4 further comprising the step of driving a generator with said steam turbine, said generator supplying current for a blower to supply primary air to said recuperator burners.
Claim 7
Dependent Claim
26 words
The method of claim 1 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
Claim 8
Dependent Claim
45 words
The method of claim 2 wherein said industrial furnace further includes a steam generating water cooling system for parts of the furnace that become hot, said method further comprising the step of supplying said waste heat boiler with the steam generated by said cooling system.
Claim 9
Dependent Claim
33 words
The method of claim 7 further comprising the step of expanding said water vapor generated in said waste heat boiler in a turbine before it serves to drive said steam jet injectors .
Claim 10
Dependent Claim
32 words
The method of claim 8 further comprising the step of driving a generator with said steam turbine, said generator supplying current for a blower to supply primary air to said recuperator burners.
Claim 11
Dependent Claim
26 words
The method of claim 2 further comprising the step of heating said waste heat boiler by auxilliary heating meand during the starting phase of said furnace.
Claim 12
Dependent Claim
26 words
The method of claim 3 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
Claim 13
Dependent Claim
26 words
The method of claim 4 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
Claim 14
Dependent Claim
26 words
The method of claim 5 further comprising the step of heating said waste heat boileer by auxilliary heating means during the starting phase of said furnace.
Claim 15
Dependent Claim
26 words
The method of claim 7 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
Claim 16
Dependent Claim
26 words
The method of claim 8 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
Claim 17
Dependent Claim
26 words
The method of claim 9 further comprising the step of heating said waste heat boiler by auxilliary heating means during the starting phase of said furnace.
References Cited (Backward Citations)
FR428560A
Cited
DE897467C
Cited
DE1162391B
Cited
FR1380735A
Cited
CH465146A
Cited
DE2759286A1
Cited
FR2353709A1
Cited
DE3018368A1
Cited
US4422299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |