US4713152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for the removal of oxides of nitrogen and sulfur from combustion processes
Assignee: VSM Associates Inc
•
Filing: 1987-03-09
•
Granted: 1987-12-15
•
Expires: 2007-03-09
Abstract
Abstract A process for removing oxide contaminants from combustion gas, and employing a solid electrolyte reactor, includes: (a) flowing the combustion gas into a zone containing a solid electrolyte and applying a voltage and at elevated temperature to thereby separate oxygen via the solid electrolyte, (b) removing oxygen from that zone in a first stream and removing hot effluent gas from that zone in a second stream, the effluent gas containing contaminant, (c) and pre-heating the combustion gas flowing to that zone by passing it in heat exchange relation with the hot effluent gas.
Inventors
- 👤 John V. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:54
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/32; B01D53/326
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
102 words
In a process for removing oxide contaminants from combustion gas, and employing solid electrolyte reactor means, the steps that include: (a) flowing the combustion gas into a zone containing said solid electrolyte means and applying a voltage to said means and at elevated temperature to thereby separate oxygen via said solid electrolyte means, (b) removing oxygen from said zone in a first stream and removing hot effluent gas from said zone in a second stream, the effluent gas containing contaminant, (c) and pre-heating the combustion gas flowing to said zone by passing it in heat exchange relation with said hot effluent gas.
Claim 2
Dependent Claim
102 words
In a process for removing oxide contaminants from combustion gas, and employing solid electrolyte reactor means, the steps that include: (a) flowing the combustion gas into a zone containing said solid electrolyte means and applying a voltage to said means and at elevated temperature to thereby separate oxygen via said solid electrolyte means, (b) removing oxygen from said zone in a first stream and removing hot effluent gas from said zone in a second stream, the effluent gas containing contaminant, (c) and pre-heating the combustion gas flowing to said zone by passing it in heat exchange relation with said hot effluent gas.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein said removal of oxygen from said zone includes flowing air or oxygen depleted effluent to said zone to mix with the oxygen and form said first stream.
Claim 4
Dependent Claim
24 words
The process of claim 2 including pre-heating said air flowing to said zone to lower the partial pressure of the oxygen at said zone.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein said pre-heating of the air is carried out by passing it in heat exchange relation with said hot effluent gas.
Claim 6
Dependent Claim
25 words
The process of claim 3 wherein said pre-heating of the air is carried out by passing it in heat exchange relation with the combustion gas.
Claim 7
Dependent Claim
30 words
The process of claim 1 including also further controllably pre-heating the combustion gas flowing to said zone by passing it in heat exchange relation with hot gas from a firebox.
Claim 8
Dependent Claim
52 words
The process of claim 1 wherein said contaminant includes SO 2 which dissociates in said zone, with S carried from said zone in the effluent second stream, and including removing S from said second stream as the second stream passes in heat exchange relation with the combustion gas flowing to said zone.
Claim 9
Dependent Claim
46 words
The process of claim 1 wherein said contaminants include SO 2 and NO 2 , S and N 2 forming in said zone, and including removing S from said second stream, N 2 being carried in gaseous state in said second stream to discharge to atmosphere.
Claim 10
Dependent Claim
28 words
The process of claim 1 including combusting fuel gas and air, and mixing the combustion products thereof with said combustion gas flowing to said zone controlling its temperature.
Claim 11
Dependent Claim
26 words
The process of claim 2 including employing said first stream that includes O 2 and air in the combustion of fuel that forms said combustion gas.
Claim 12
Dependent Claim
24 words
The process of claim 1 wherein said solid electrolyte comprises a zirconia tube having a wall penetrated by oxygen ions dissociated from contaminant ions.
Claim 13
Dependent Claim
117 words
In a system for removing oxide contaminants from combustion gas, and employing solid electrolyte reactor means, the combination comprising (a) a reaction zone containing said solid electrolyte means to which a voltage is applied, and at elevated temperature, (b) means flowing such combustion gas to said zone whereby oxygen is separated from said oxides via said solid electrolyte reactor means and flows from said zone in a first stream, and hot effluent gas flows from said zone in a second stream from which said contaminants have been removed, (c) and first heat transfer means receiving said second stream and said combustion gas for transferring heat from said second stream to the combustion gas flowing to said zone.
Claim 14
Dependent Claim
117 words
In a system for removing oxide contaminants from combustion gas, and employing solid electrolyte reactor means, the combination comprising (a) a reaction zone containing said solid electrolyte means to which a voltage is applied, and at elevated temperature, (b) means flowing such combustion gas to said zone whereby oxygen is separated from said oxides via said solid electrolyte reactor means and flows from said zone in a first stream, and hot effluent gas flows from said zone in a second stream from which said contaminants have been removed, (c) and first heat transfer means receiving said second stream and said combustion gas for transferring heat from said second stream to the combustion gas flowing to said zone.
Claim 15
Dependent Claim
27 words
The system of claim 12 including means flowing air to said zone to mix with the oxygen removed from the contaminant, to thereby form said first stream.
Claim 16
Dependent Claim
35 words
The system of claim 13 including second heat transfer means for pre-heating said air flowing to said zone to lower the partial pressure of the oxygen at the discharge side of said electrolyte reactor means.
Claim 17
Dependent Claim
33 words
The system of claim 14 wherein said second heat transfer means includes a heat exchanger receiving said hot effluent second stream for transfer of heat therefrom to said air flowing to said zone.
Claim 18
Dependent Claim
31 words
The system of claim 14 wherein said second heat transfer means includes a heat exchanger receiving hot combustion gas for transfer of heat therefrom to said air flowing to said zone.
Claim 19
Dependent Claim
38 words
The system of claim 12 including a heat exchanger receiving hot firebox gas for transfer of heat thereform to the combustion gas flowing to said zone, and means controlling the flow of hot firebox gas to said exchanger.
Claim 20
Dependent Claim
54 words
The system of claim 12 wherein said contaminants include SO 2 which dissociates in said zone, with S carried from said zone in the effluent second stream, and including means for removing S from said second stream as the second stream passes in heat exchange relation with the combustion gas flowing to said zone.
Claim 21
Dependent Claim
48 words
The system of claim 12 wherein said contaminants include SO 2 and NO 2 , S and N 2 forming in said zone, and including means for removing S from said second stream, N 2 being carried in gaseous state in said second stream to discharge to atmosphere.
Claim 22
Dependent Claim
25 words
The system of claim 12 including means combusting fuel gas and air to form combustion products mixed with said combustion gas flowing to said zone.
Claim 23
Dependent Claim
27 words
The system of claim 13 including means passing said first stream that includes O 2 and air to a fuel combustion process that forms said combustion gases.
Claim 24
Dependent Claim
24 words
The system of claim 12 wherein said solid electrolyte comprising a zirconium tube having a wall penetrated by oxygen ions dissociated from contaminant ions.
Claim 25
Dependent Claim
19 words
The system of claim 12 including electrodes applied to said electrolyte means which is tubular and consists of zirconia.
Claim 26
Dependent Claim
11 words
The system of claim 23 wherein said electrodes have wool-like form.
Claim 27
Dependent Claim
27 words
The system of claim 19 in which said contaminants also include SO 3 , NO, NO 3 , S 2 , S 4 and S 8 .
Claim 28
Dependent Claim
29 words
The process of claim 1 herein said contaminant includes NO 2 , which dissociates in said zone, with N 2 carried from said zone in the effluent second stream.
References Cited (Backward Citations)
US3347767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |