US4160805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler containing denitrator
Assignee: Kanadevia Corp
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Filing: 1977-07-14
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Granted: 1979-07-10
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Expires: 1997-07-14
Abstract
Abstract In a boiler having a plurality of heat exchanger stages such as a superheater, an evaporator and a preheater, disposed in a combustion gas channel between heat exchangers including an optimum catalytic reaction temperature region are a denitration catalyst layer crossing said channel and a reductant feeding device for adding a reductant such as ammonia gas at a point a little short of catalyst layer. The denitration catalyst layer comprises a number of plate-like catalyst bodies whose plate surfaces extend along the direction of flow of gas, and desirably it is honey-comb-shaped. If the boiler is a waste heat boiler, the denitration catalyst layer will be disposed between the superheater and the evaporator.
Inventors
- 👤 Hideya Inaba
- 👤 Toshio Tatsumi
- 👤 Chihiro Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; F; F23; F23J; F23J15/00; F23J15/003; F23J2215/00; F23J2215/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
In a waste heat boiler having a superheater, an evaporator and an economizer disposed in a combustion gas channel formed therein, the improvement comprising, a denitration catalyst layer disposed between said superheater and said evaporator, said catalyst layer being constituted by a number of plate-like denitration catalyst bodies disposed with their plate surfaces extending along the direction of flow of combustion gas, and reductant feeding means for adding a reductant to the combustion gas provided between said catalyst layer and said superheater.
Claim 2
Dependent Claim
82 words
In a waste heat boiler having a superheater, an evaporator and an economizer disposed in a combustion gas channel formed therein, the improvement comprising, a denitration catalyst layer disposed between said superheater and said evaporator, said catalyst layer being constituted by a number of plate-like denitration catalyst bodies disposed with their plate surfaces extending along the direction of flow of combustion gas, and reductant feeding means for adding a reductant to the combustion gas provided between said catalyst layer and said superheater.
Claim 3
Dependent Claim
20 words
A boiler as set forth in claim 1, wherein said plate-like denitration catalyst bodies are combined in a honeycomb form.
Claim 4
Dependent Claim
51 words
A boiler as set forth in claim 1, wherein said plate-like denitration catalyst bodies are assembled into a box whose two opposed surfaces facing in the direction of flow of gas are open, to form a unit block body, said catalyst layer consisting of a combination of such unit block bodies.
Claim 5
Dependent Claim
49 words
A boiler as set forth in claim 1, wherein said reductant feeding means comprises a plurality of injection pipes extending into the gas channel and each having a number of reductant injecting ports, and a reductant feeding unit disposed outside the gas channel and communicating with said injection pipes.
Claim 6
Dependent Claim
31 words
A boiler as set forth in claim 1, including a source of ammonia gas to be added as a reductant to the combustion gas by the reductant feeding means as aforesaid.
Claim 7
Dependent Claim
38 words
A boiler as set forth in claim 1, including a source of CO, H 2 or a hydrocarbon or combination thereof to be added as a reductant to the combination gas by said reductant feeding means as aforesaid.
Claim 8
Dependent Claim
23 words
A boiler as set forth in claim 1, including means for feeding said waste heat boiler with waste gas from a gas turbine.
References Cited (Backward Citations)
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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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |