Patent US3174652A successfully refreshed from Google Patents.
Patent US5458748A successfully refreshed from Google Patents.
US5458748A
Expired / Lapsed
US
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Coronal-catalytic apparatus and method for NOx reduction
Assignee: Leidos Security Detection and Automation Inc
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Filing: 1993-09-20
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Granted: 1995-10-17
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Expires: 2013-09-20
Abstract
Abstract This invention presents an NO x environment effective reduction apparatus comprising a sulfur tolerant, high water vapor (about 3% to about 18%) tolerant, packing-free coronal-catalyst. In one embodiment the invention comprises an NO x reduction apparatus of high water vapor tolerant coronal-catalyst adapted and configured for hypercritical presentation of an electrical field to an NO x bearing gas stream, where the electrical field has a minimum field power density of at least about 75 watts/cubic meter, and optionally, accompanying downstream scrubbers. In a particular embodiment, downstream wet or dry absorption arrest particular NO x reduction products NO 2 and HNO 3 , optionally upon exposure to an arresting agent, including basic, caustic, or alkali materials such as CaO or NH 3 .
Inventors
- 👤 Ronald W. Breault
- 👤 Christopher R. McLarnon
- 👤 Frederick E. Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:51
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01D53/32; B01D53/8631; B01D53/8659; B01D53/8662; B01D53/8668
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
64 words
A method of environment effective reducing of NO x emissions comprising the step of exposing a NO x bearing gas to a sulfur tolerant coronal-catalyst wherein the coronal-catalyst is adapted and configured for hypercritical presentation of an electrical field to an NO x bearing gas stream where the electrical field has a minimum field power density of at least about 75 watts/meter 3 .
Claim 2
Independent Claim
64 words
A method of environment effective reducing of NO x emissions comprising the step of exposing a NO x bearing gas to a sulfur tolerant coronal-catalyst wherein the coronal-catalyst is adapted and configured for hypercritical presentation of an electrical field to an NO x bearing gas stream where the electrical field has a minimum field power density of at least about 75 watts/meter 3 .
Claim 3
Dependent Claim
100 words
The method of claim 1 further comprising; disposing the coronal-catalyst in from one to a plurality of tubular members configured and adapted to receive a flow of the NO x bearing gas; maintaining the coronal-catalyst at a field power density of at least about 75 watts/meter 3 ; energizing the coronal catalyst with a voltage from about 4000 to about 30,000 volts, the voltage having a frequency of from 60 Hz to about 30,000 Hz; and maintaining residency of the flow of NO x bearing gas in the tubular members of from about 0.2 to about 5 seconds or more.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said exposing the NO x bearing gas to the sulfur tolerant coronal-catalyst reduces NO x concentration of the NO x bearing gas by at least 40%.
Claim 5
Dependent Claim
29 words
The method of claim 3 further comprising the step of N/S scrubbing of the NO x bearing gas stream that has been exposed to the sulfur tolerant coronal catalyst.
Claim 6
Dependent Claim
43 words
The method of claim 4 wherein said N/S scrubbing further includes the steps of treating the exposed NO x bearing gas stream to obtain H 2 SO 4 and nitrogenous reduction products; and collecting the H 2 SO 4 and nitrogenous reduction products.
Claim 7
Dependent Claim
32 words
The method of claim 1 wherein said exposing the NO x bearing gas to the sulfur tolerant coronal-catalyst reduces NO x concentration of the NO x bearing gas by at least 90%.
Claim 8
Dependent Claim
32 words
The method of claim 1 wherein said exposing the NO x bearing gas to the sulfur tolerant coronal-catalyst reduces NO x concentration of the NO x bearing gas by at least 98%.
Claim 9
Independent Claim
74 words
A method of environment effective reducing of NO x emissions comprising the steps of: disposing at least one row of a plurality of electrodes in a stream of NO x bearing gas, each electrode in said row being spaced from each other; energizing the electrodes in each said row to establish a supra-arc voltage arc-free zone for each said row; and exposing the NO x bearing gas to each row's supra-arc voltage arc-free zone.
Claim 10
Independent Claim
74 words
A method of environment effective reducing of NO x emissions comprising the steps of: disposing at least one row of a plurality of electrodes in a stream of NO x bearing gas, each electrode in said row being spaced from each other; energizing the electrodes in each said row to establish a supra-arc voltage arc-free zone for each said row; and exposing the NO x bearing gas to each row's supra-arc voltage arc-free zone.
Claim 11
Dependent Claim
42 words
The method of claim 8 wherein said energizing includes applying a voltage to the electrodes in each said row so each said supra-arc voltage arc-free zone has a minimum electrical field power density of from at least about 75 watts/meter 3 .
Claim 12
Dependent Claim
22 words
The method of claim 9 wherein the voltage being applied is in the range of from about 4,000 to about 30,000 volts.
Claim 13
Dependent Claim
29 words
The method of claim 10 wherein the voltage being applied is a cyclical voltage having a frequency in the range of from about 60 Hz to about 30,000 Hz.
Claim 14
Dependent Claim
31 words
The method of claim 8 further comprising the step of controlling flow of the NO x bearing gas stream so the gas stream flows through each said supra-arc voltage arc-free zone.
Claim 15
Dependent Claim
39 words
The method of claim 12 wherein said controlling also controls the gas flow so the NO x bearing gas stream requires from about 0.2 to about 5 seconds or more to pass through all the supra-arc voltage arc-free zones.
Claim 16
Dependent Claim
24 words
The method of claim 8 further comprising the step of applying a dielectric material to at least every other electrode in each said row.
Claim 17
Dependent Claim
20 words
The method of claim 14 wherein said applying includes applying the dielectric material to each electrode in each said row.
Claim 18
Dependent Claim
25 words
The method of claim 8 further comprising the step of adding a gas to the NO x bearing gas stream to increase NO x reduction.
Claim 19
Dependent Claim
27 words
The method of claim 8 further comprising the step of N/S scrubbing of the NO x bearing gas stream being exposed to the supra-arc voltage arc-free zones.
Claim 20
Dependent Claim
40 words
The method of claim 17 wherein said N/S scrubbing further includes treating the exposed NO x bearing gas stream to obtain H 2 SO 4 and nitrogenous reduction products and collecting the H 2 SO 4 and nitrogenous reduction products.
Claim 21
Independent Claim
79 words
A method of environment effective reducing of NO x emissions comprising the steps of: disposing a plurality of rows of electrodes in a stream of NO x bearing gas, each said row being spaced from each other, and each said row having a plurality of spaced electrodes; energizing the electrodes in each said row to establish a supra-arc voltage arc-free zone for each said row; and exposing the NO x bearing gas to each said supra-arc voltage arc-free zone.
Claim 22
Independent Claim
79 words
A method of environment effective reducing of NO x emissions comprising the steps of: disposing a plurality of rows of electrodes in a stream of NO x bearing gas, each said row being spaced from each other, and each said row having a plurality of spaced electrodes; energizing the electrodes in each said row to establish a supra-arc voltage arc-free zone for each said row; and exposing the NO x bearing gas to each said supra-arc voltage arc-free zone.
Claim 23
Dependent Claim
42 words
The method of claim 19 wherein said energizing includes applying a voltage to the electrodes in each said row so each said supra-arc voltage arc-free zone has a minimum electrical field power density of from at least about 75 watts/meter 3 .
Claim 24
Dependent Claim
38 words
The method of claim 19 wherein the voltage being applied is in the range of from about 4,000 to about 30,000 volts and having a frequency in the range of from about 60 Hz to about 30,000 Hz.
Claim 25
Dependent Claim
31 words
The method of claim 19 further comprising the step of controlling flow of the NO x bearing gas stream so the gas stream flows through each said supra-arc voltage arc-free zone.
Claim 26
Dependent Claim
39 words
The method of claim 22 wherein said controlling also controls the gas flow so the NO x bearing gas stream requires from about 0.2 to about 5 seconds or more to pass through all the supra-arc voltage arc-free zones.
Claim 27
Dependent Claim
24 words
The method of claim 19 further comprising the step of applying a dielectric material to at least every other electrode in each said row.
Claim 28
Dependent Claim
20 words
The method of claim 24 wherein said applying includes applying the dielectric material to each electrode in each said row.
Claim 29
Dependent Claim
25 words
The method of claim 19 further comprising the step of adding a gas to the NO x bearing gas stream to increase NO x reduction.
Claim 30
Dependent Claim
63 words
The method of claim 19 further comprising the step of N/S scrubbing of the NO x bearing gas stream being exposed to the supra-arc voltage arc-free zones and wherein said N/S scrubbing further includes treating the exposed NO x bearing gas stream to obtain H 2 SO 4 and nitrogenous reduction products and collecting the H 2 SO 4 and nitrogenous reduction products.
Claim 31
Dependent Claim
28 words
The method of claim 8 wherein said exposing the NO x bearing gas to reduces NO x concentration of the NO x bearing gas by at least 40%.
Claim 32
Dependent Claim
70 words
The method of claim 15 wherein said energizing includes applying a cyclical voltage in the range of from about 4,000 to about 30,000 volts and having a frequency in the range of from about 60 Hz to about 30,000 Hz, wherein the voltage and frequency of the cyclical voltage being applied is such that said exposing reduces NO x concentration of the NO x bearing gas by at least 40%.
Claim 33
Dependent Claim
27 words
The method of claim 19 wherein said exposing the NO x bearing gas reduces NO x concentration of the NO x bearing gas by at least 40%.
Claim 34
Dependent Claim
70 words
The method of claim 25 wherein said energizing includes applying a cyclical voltage in the range of from about 4,000 to about 30,000 volts and having a frequency in the range of from about 60 Hz to about 30,000 Hz, wherein the voltage and frequency of the cyclical voltage being applied is such that said exposing reduces NO x concentration of the NO x bearing gas by at least 40%.
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