US5424044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated SCR electrostatic precipitator
Assignee: Babcock and Wilcox Co
•
Filing: 1994-03-23
•
Granted: 1995-06-13
•
Expires: 2014-03-23
Abstract
Abstract An integrated SCR ESP employs catalytic collector plates for NO x and particulate removal. Ammonia injected either directly in the ESP or upstream therefrom catalytically reduces NO x to nitrogen and water. The excess ammonia assists in capturing particulates in the ESP. This prevents problems of ammonia slippage. The SCR catalytic collector plates are positioned in at least one field of the ESP and preferably in at least the first field.
Inventors
- 👤 Daniel S. Kalka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:40
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; B03; B03C; B03C3/00; B03C3/01; B03C3/013; B03C3/019
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
An apparatus for removing nitrogen oxides and particulates from a flue gas, comprising: an electrostatic precipitator positioned in a flue gas stream, said electrostatic precipitator having a plurality of fields with electrical components to remove particulates from the flue gas stream, said electrostatic precipitator having at least one field without electrical components; means for introducing ammonia in said electrostatic precipitator in the at least one field without the electrical components; and at least one catalyst positioned in the at least one field of said electrostatic precipitator without electrical components for selective catalytic reduction of nitrogen oxides and subsequent particulate removal.
Claim 2
Independent Claim
100 words
An apparatus for removing nitrogen oxides and particulates from a flue gas, comprising: an electrostatic precipitator positioned in a flue gas stream, said electrostatic precipitator having a plurality of fields with electrical components to remove particulates from the flue gas stream, said electrostatic precipitator having at least one field without electrical components; means for introducing ammonia in said electrostatic precipitator in the at least one field without the electrical components; and at least one catalyst positioned in the at least one field of said electrostatic precipitator without electrical components for selective catalytic reduction of nitrogen oxides and subsequent particulate removal.
Claim 3
Dependent Claim
16 words
An apparatus as recited in claim 1, wherein said introducing means comprises an ammonia injection grid.
Claim 4
Dependent Claim
16 words
An apparatus as recited in claim 1, wherein said introducing means comprises a bank of atomizers.
Claim 5
Dependent Claim
26 words
An apparatus as recited in claim 1, wherein said at least one catalyst is a catalytic plate coated with a selective catalyst for reducing nitrogen oxides.
Claim 6
Dependent Claim
22 words
An apparatus as recited in claim 1, wherein said at least one catalyst is a catalyst plate constructed of a selective catalyst.
Claim 7
Dependent Claim
28 words
An apparatus as recited in claim 1, wherein said at least one field of said electrostatic precipitator without electrical components includes a first field of said electrostatic precipitator.
Claim 8
Independent Claim
104 words
A method for removing nitrogen oxides and particulates from a flue gas, comprising the steps of: positioning an electrostatic precipitator having a plurality of fields with electrical components in a flue gas stream; removing electrical components from at least one field of said electrostatic precipitator; positioning a catalyst for selective catalytic reduction of nitrogen oxides in the at least one field of the electrostatic precipitator; introducing ammonia into the flue gas stream; passing the flue gas stream through the electrostatic precipitator having the at least one catalyst positioned therein; catalytically reducing nitrogen oxides in the flue gas; and removing particulates from the flue gas.
Claim 9
Independent Claim
104 words
A method for removing nitrogen oxides and particulates from a flue gas, comprising the steps of: positioning an electrostatic precipitator having a plurality of fields with electrical components in a flue gas stream; removing electrical components from at least one field of said electrostatic precipitator; positioning a catalyst for selective catalytic reduction of nitrogen oxides in the at least one field of the electrostatic precipitator; introducing ammonia into the flue gas stream; passing the flue gas stream through the electrostatic precipitator having the at least one catalyst positioned therein; catalytically reducing nitrogen oxides in the flue gas; and removing particulates from the flue gas.
Claim 10
Dependent Claim
31 words
A method as recited in claim 7, wherein the introducing step includes the step of introducing the ammonia in the at least one field of the electrostatic precipitator without electrical components.
Claim 11
Dependent Claim
21 words
A method as recited in claim 7, wherein the at least one field includes the first field of the electrostatic precipitator.
Claim 12
Dependent Claim
26 words
A method as recited in claim 7, wherein the introducing step includes the step of injecting the ammonia in a duct upstream of the electrostatic precipitator.
References Cited (Backward Citations)
US4434147A
Cited
GB2192624A
Cited
US4925633A
Cited
US4888158A
Cited
US5008628A
Cited
US5300270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |