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US4744964A
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Method of purifying pyrolysis gases
Assignee: ENVIRONMENT PROTECTION ENGINEERS INCORPORATED 3000 TOWN CENTER SUITE 2530 - SOUTHFIELD MICHIGAN 48075 A CORP OF UNITED STATES
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Filing: 1985-08-02
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Granted: 1988-05-17
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Expires: 2005-08-02
Abstract
Abstract The invention relates to a method of purifying pyrolysis gases preferably containing hydrogen halides and/or acidic gaseous sulfur compounds by simultaneous neutralization and dust separation in which the gas entraining large amounts of dusty solid particles is led through a bulk bed for the purpose of binding the gaseous pollutants, and an apparatus for carrying out said method. The problem of clogging and plugging of the bulk bed is solved in that the grains of the bulk bed are set in shocklike movement and are thus subjected to a minimum wear by mechanical abrasion, the clogging of the bulk bed filter thus being avoided and the purification of the gas improved.
Inventors
- 👤 Eberhard Kuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:37
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/20; B; B01; B01D; B01D50/00; B01D50/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A continuous method of purifying acidic pyrolysis gases containing at least one of hydrogen halides, hydrogen sulfide and sulfur oxides with simultaneous neutralization and dust separation, in which the gas is mixed with a particulate basic neutralizing agent containing at least one of lime hydrate, limestone, dolomite, calcium oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, basic sodium compounds and basic potassium compounds, the mixture of gas and neutralizing agent is led continuously downwardly through a bulk bed of granular mineral material resting on a gas and dust-permeable bottom, the bulk bed is intermittently set in shocklike movement during said continuous method, and said mixture is continuously subjected to dust removal after passing through said gas and dust-permeable bottom.
Claim 2
Dependent Claim
118 words
A continuous method of purifying acidic pyrolysis gases containing at least one of hydrogen halides, hydrogen sulfide and sulfur oxides with simultaneous neutralization and dust separation, in which the gas is mixed with a particulate basic neutralizing agent containing at least one of lime hydrate, limestone, dolomite, calcium oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, basic sodium compounds and basic potassium compounds, the mixture of gas and neutralizing agent is led continuously downwardly through a bulk bed of granular mineral material resting on a gas and dust-permeable bottom, the bulk bed is intermittently set in shocklike movement during said continuous method, and said mixture is continuously subjected to dust removal after passing through said gas and dust-permeable bottom.
Claim 3
Dependent Claim
29 words
Method according to claim 1 wherein said gas and dust-permeable bottom is subjected to impacts and the shocklike movement of the bottom is transmitted to the bulk bed grains.
Claim 4
Dependent Claim
33 words
Method according to claim 1, wherein fittings projecting into the interior of the bulk bed are subjected to impact and the shocklike movement of the fittings is transmitted to the bulk bed grains.
Claim 5
Dependent Claim
23 words
Method according to claim 1, wherein said shocklike movement is generated with the aid of one of a vibration generator and a knocker.
Claim 6
Dependent Claim
20 words
Method according to claim 4, wherein one of a vibrator and a sonic generator is used as said vibration generator.
Claim 7
Dependent Claim
17 words
Method according to claim 1, wherein a screen bottom is used as said gas and dust-permeable bottom.
Claim 8
Dependent Claim
23 words
Method according to claim 3, wherein said fittings projecting into the interior of the bulk bed include a rake comprising profiled circular rods.
Claim 9
Dependent Claim
19 words
Method according to claim 7, wherein said rake subjected to the impacts is simultaneously moved in a horizontal direction.
Claim 10
Dependent Claim
27 words
Method according to claim 1, wherein bulk bed grains are used having a granulation size ranging from 1 to 12 mm, preferably from 3 to 8 mm.
Claim 11
Dependent Claim
22 words
Method according to claim 1, wherein as bulk bed grains at least one of absorptively and adsorptively acting granular materials are used.
Claim 12
Dependent Claim
26 words
Method according to claim 1, wherein the pyrolysis gas flow after leaving the screen bed, beneath the gas and dust-permeable bottom, is subjected to a deflection.
Claim 13
Dependent Claim
23 words
Method according to claim 11, wherein after the deflection said mixture is continuously subjected to said dust removal within the pyrolysis gas chamber.
Claim 14
Dependent Claim
14 words
Method according to claim 12, wherein a cyclone is used for said dust removal.
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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |