US4220633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter house and method for simultaneously removing NOx and particulate matter from a gas stream
Assignee: Babcock and Wilcox Co
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Filing: 1979-04-30
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Granted: 1980-09-02
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Expires: 1999-04-30
Abstract
Abstract A filter house (12) employing a selective catalytic reduction process for removing NO x emissions from a flue gas stream while simultaneously filtering out and collecting entrained particulate matter from the stream. Accordingly, the filter house (12) includes flue gas inlet and outlet passages (18, 30) and a plurality of porous filter bags. The bags are treated with a suitable catalyst to facilitate the selective catalytic reduction process.
Inventors
- 👤 Edward A. Pirsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; B01D53/8628; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
An improved selective catalytic reduction process for treating NO x -laden gases containing entrained particulate matter wherein ammonia is added to the gas, the process comprising the following steps: (a) introducing the ammonia/gas combination into a filter house, the filter house including a plurality of catalytic filter bags, (b) passing the ammonia/gas combination through the filter bags for simultaneous NO x reduction and particulate matter removal, and (c) venting the cleansed gas out of the filter house.
Claim 2
Dependent Claim
77 words
An improved selective catalytic reduction process for treating NO x -laden gases containing entrained particulate matter wherein ammonia is added to the gas, the process comprising the following steps: (a) introducing the ammonia/gas combination into a filter house, the filter house including a plurality of catalytic filter bags, (b) passing the ammonia/gas combination through the filter bags for simultaneous NO x reduction and particulate matter removal, and (c) venting the cleansed gas out of the filter house.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the catalyst is a noble metal.
Claim 4
Dependent Claim
13 words
The process according to claim 1 wherein the catalyst is a non-noble metal.
Claim 5
Dependent Claim
28 words
The process according to claim 3 wherein the catalyst is selected from the group consisting of the oxides of copper, iron, vanadium, cobalt, molybdenum, manganese, tungsten, and iron-chromium.
Claim 6
Dependent Claim
14 words
The process according to claim 3 wherein the catalyst is zirconium promoted lanthanum cuprate.
Claim 7
Dependent Claim
16 words
The process according to claim 3 wherein the catalyst is an iron base ammonia decomposition catalyst.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |