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US4347072A
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Method and device for reducing NOx generated in glass-melting furnace
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1980-11-21
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Granted: 1982-08-31
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Expires: 2000-11-21
Abstract
Abstract Method and device for reducing NOx content in the waste gas generated in a glass melting furnace of side firing or end firing type equipped with a heat recovering device, comprising supplying hydrocarbons in a counter flow to that of the waste gas by combustion, or from the corners of the combustion chamber into the combustion chamber over the melt tank.
Inventors
- 👤 Kinnosuke Nagaoka
- 👤 Tsumugu Kato
- 👤 Mitsuru Nozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; Y; Y02; Y02P; Y02P40/00; Y02P40/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A method for reducing NO x content in a waste gas generated in a glass melting furnace of side firing or end firing type which is equipped with a regenerator, comprising supplying hydrocarbons into the waste gas from fuel combustion produced over a melting tank within a combustion chamber, without supplying sufficient additional oxygen for burning said hydrocarbons, so as to effect the reducing reaction of the NO x in the combustion waste gas.
Claim 2
Independent Claim
74 words
A method for reducing NO x content in a waste gas generated in a glass melting furnace of side firing or end firing type which is equipped with a regenerator, comprising supplying hydrocarbons into the waste gas from fuel combustion produced over a melting tank within a combustion chamber, without supplying sufficient additional oxygen for burning said hydrocarbons, so as to effect the reducing reaction of the NO x in the combustion waste gas.
Claim 3
Dependent Claim
12 words
Method of claim 1, wherein said hydrocarbons are heavy oil or kerosene.
Claim 4
Dependent Claim
16 words
Method of claim 1 or 2, wherein said hydrocarbons are supplied by atomizing with compressed air.
Claim 5
Dependent Claim
15 words
Method of claim 1 or 2, wherein said hydrocarbons are supplied by atomizing with L.P.G.
Claim 6
Dependent Claim
28 words
Method of claim 1, wherein said hydrocarbons are supplied by atomizing from the vicinity of a port connecting a regenerator with the combustion chamber over the melting tank.
Claim 7
Independent Claim
62 words
A method for reducing NO x content in waste gas generated in a glass-melting furnace of side firing or end firing type, which is equipped with a heat recovering device, comprising supplying hydrocarbons into waste gas from fuel combustion above the glass melt, without supplying sufficient additional oxygen for burning said hydrocarbons, through auxiliary burners installed at the corners of the furnace.
Claim 8
Independent Claim
62 words
A method for reducing NO x content in waste gas generated in a glass-melting furnace of side firing or end firing type, which is equipped with a heat recovering device, comprising supplying hydrocarbons into waste gas from fuel combustion above the glass melt, without supplying sufficient additional oxygen for burning said hydrocarbons, through auxiliary burners installed at the corners of the furnace.
Claim 9
Dependent Claim
9 words
Method of claim 6, wherein said hyddrocarbons are kerosene.
Claim 10
Dependent Claim
28 words
Method of claim 3, wherein said hydrocarbons are supplied by atomizing from the vicinity of a port connecting a regenerator with the combustion chamber over the melting tank.
Claim 11
Dependent Claim
126 words
A glass-melting furnace of side firing or end firing type equipped with a regenerator, comprising a combustion chamber provided above a glass-melting tank in which an unmelted batch material is fed and melted material is stored, at least two sets of burners for alternatively feeding a fuel and oxygen supply which is to be burned into the combustion chamber, means for feeding hydrocarbons into the waste gas produced by combustion of the fuel simultaneously with the feeding of fuel and oxygen supply by a first set of burners, and control means for restricting the oxygen supply to the hydrocarbon feeding means while combustion is occurring at said first set of burners, whereby the NO x in the waste gas from the glass-melting furnace can be reduced.
Claim 12
Dependent Claim
126 words
A glass-melting furnace of side firing or end firing type equipped with a regenerator, comprising a combustion chamber provided above a glass-melting tank in which an unmelted batch material is fed and melted material is stored, at least two sets of burners for alternatively feeding a fuel and oxygen supply which is to be burned into the combustion chamber, means for feeding hydrocarbons into the waste gas produced by combustion of the fuel simultaneously with the feeding of fuel and oxygen supply by a first set of burners, and control means for restricting the oxygen supply to the hydrocarbon feeding means while combustion is occurring at said first set of burners, whereby the NO x in the waste gas from the glass-melting furnace can be reduced.
Claim 13
Dependent Claim
52 words
The glass-melting furnace of claim 9, wherein said hydrocarbon feeding means is at least one of said sets of burners for alternatively feeding a fuel and oxygen supply which is to be burned which halts feeding said fuel and oxygen supply into the combustion chamber to feed hydrocarbons into the waste gas.
Claim 14
Dependent Claim
17 words
The glass-melting furnace of claim 9, wherein said hydrocarbon feeding means is at least one auxiliary burner.
Claim 15
Dependent Claim
23 words
The glass-melting furnace of claim 11, wherein said auxiliary burners are provided at the corners of the combustion chamber over the melting tank.
References Cited (Backward Citations)
US2354324A
Cited
US3592623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |