US3704569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for conditioning flue gas with h{11 {11 so{11
Assignee: Universal Oil Products Co
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Filing: 1970-04-02
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Granted: 1972-12-05
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Expires: 1990-04-02
Abstract
Abstract In order to preclude resistance of entrained fine particles to collection within electrical precipitator means, there is a conditioning of the particles carried in the flue gas stream by having vaporized and decomposed H2SO4 condensed and adsorbed on the particles themselves. Sulfuric acid is mixed and vaporized with a hot gaseous stream at a temperature above 400* F. and then the resulting hot stream with decomposed H2SO4 is introduced uniformly into the flue gas stream at a zone ahead of the precipitator unit so that the acid can reform and condense on the particles.
Inventors
- 👤 Leslie C Hardison
- 👤 Salvatore A Guerrieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:35
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The method of claim 1 further characterized in that condensation and adsorption is effected at a temperature of about 270* F. to about 330* F.
Claim 2
Dependent Claim
52 words
The method of claim 1 further characterized in that the hot gaseous stream is air and the rate at which sulfuric acid is introduced into said air is decreased where the temperature level of the hot gaseous air stream containing vaporized sulfuric acid falls below the dew point of the air-acid mixture.
Claim 3
Dependent Claim
47 words
The method of claim 1 further characterized in that said hot gaseous stream is air and the sulfuric acid is introduced into said heated air stream in an amount to provide a weight ratio of air to acid in the range of about 17 to about 40.
Claim 4
Independent Claim
285 words
A system for conditioning a fly ash laden flue gas prior to electrical precipitation comprising: a. heater means for heating air to a temperature above 400* F; b. air inlet means connected to said air-heating means for introducing air into said air heating means; c. means for passing a heated air stream from said air-heating means to a mixing-vaporizing means; d. mixing-vaporizing means for mixing heated air and sulfuric acid at sulfuric acid vaporizing conditions connected to the heated air stream passing means of (c), said mixing-vaporizing means having a vaporizing zone of an elongated construction relative to the flow of the air and sulfuric acid mixture such that the residence time of said mixture is suitable to effect the substantially complete gasification of the sulfuric acid; e. outlet means connected to the mixing-vaporizing means for transferring the hot gas-vaporized acid stream produced in step (d) to a manifold means; f. control valve means connected to the mixing-vaporizing means whereby sulfuric acid is introduced into said mixing-vaporizing means; g. temperature indication and control means connected with and responsive to the temperature in said mixing-vaporizing means and connected with said control valve means, whereby acid flow may be regulated responsive to a temperature level from said mixing-vaporizing means; h. manifold means connected to the outlet means of (e), said manifold means having connective means for discharging hot gas-vaporized acid stream into a flue gas duct; i. a flue gas duct, connected to the connective means of the manifold means, whereby condensation of acid or reforming of decomposed acid as a mono-molecular adsorption thereof on fly ash laden flue gas within the duct is effected thereby lessening the resistivity of the fly ash prior to electrical precipitation.
Claim 5
Dependent Claim
60 words
The system of claim 5 further characterized in that dew point indicator means communicates with the interior of said manifold means and control means from the dew point indicator means communicates with the control valve means in the acid introduction means to the mixer-vaporizer means, whereby acid flow may be varied responsive to readings From said dew point indicator means.
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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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |