US3876750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas scrubbing system
Assignee: Edward C Levy Co
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Filing: 1972-12-12
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Granted: 1975-04-08
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Expires: 1992-12-12
Abstract
Abstract The gaseous effluent from power plant boilers, lime kilns or the like is subjected to water scrubbing for the removal of pollutants. The lime kiln gases, or the scrubbing water in the case of boiler gases, is saturated with limestone or other calcium compounds which tend to form scale in the scrubber and other mechanical parts of the purification system. According to the invention, ammonium chloride is added to the water to inhibit the formation of undesirably large scale deposits in the scrubber and related apparatus.
Inventors
- 👤 Karl V Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:11
CPC Classifications
C; C23; C23F; C23F15/00; C23F15/005; B; B01; B01D; B01D47/00; B01D47/14; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A METHOD FOR CLEANING EXHAUST GASES EXITING FROM A LIME KILN, WHICH COMPRISES THE STEPS OF PASSING SAID EXHAUST GASES THROUGH A SCRUBBER CONTAINER, SPRAYING THE GASES IN SAID CONTAINER WITH WATER, REMOVING THE SPRAYED GASES IN FROM THE SCRUBBER CONTAINER, DRAINING THE SPRAYED WATER FROM THE SCRUBBER CONTAINER INTO A SOLIDS SETTLING CHAMBER, RECIRCULATING WATER FROM SAID SETTLING CHAMBER TO SAID SCRUBBER CONTAINER, ADDING FRESH MAKE-UP WATER, ADDING AMMONIUM CHLORIDE TO THE WATER SPRAYED INTO SAID CONTAINER OF SUFFICIENT QUANTITIES TO INHIBIT SCALE FORMATION THEREIN.
Claim 2
Independent Claim
86 words
A METHOD FOR CLEANING EXHAUST GASES EXITING FROM A LIME KILN, WHICH COMPRISES THE STEPS OF PASSING SAID EXHAUST GASES THROUGH A SCRUBBER CONTAINER, SPRAYING THE GASES IN SAID CONTAINER WITH WATER, REMOVING THE SPRAYED GASES IN FROM THE SCRUBBER CONTAINER, DRAINING THE SPRAYED WATER FROM THE SCRUBBER CONTAINER INTO A SOLIDS SETTLING CHAMBER, RECIRCULATING WATER FROM SAID SETTLING CHAMBER TO SAID SCRUBBER CONTAINER, ADDING FRESH MAKE-UP WATER, ADDING AMMONIUM CHLORIDE TO THE WATER SPRAYED INTO SAID CONTAINER OF SUFFICIENT QUANTITIES TO INHIBIT SCALE FORMATION THEREIN.
Claim 3
Independent Claim
108 words
A method for removing sulfur dioxide from boiler exhaust gases, which comprises the steps of passing the gases through a scrubber container, spraying said gases with a slurry comprising water and lime or limestone, removing the cleaned scrubbed gases from said container, draining the slurry from said container, recirculating the slurry through spray means to said container, draining a fractional portion of the slurry stream to means for separating sludge therefrom, recirculating a supernatant liquor from said sludge separating means to spray means in said scrubber container, and adding ammonium chloride to the slurry or liquor sprayed into said container in sufficient quantities to inhibit scale formation therein.
Claim 4
Independent Claim
108 words
A method for removing sulfur dioxide from boiler exhaust gases, which comprises the steps of passing the gases through a scrubber container, spraying said gases with a slurry comprising water and lime or limestone, removing the cleaned scrubbed gases from said container, draining the slurry from said container, recirculating the slurry through spray means to said container, draining a fractional portion of the slurry stream to means for separating sludge therefrom, recirculating a supernatant liquor from said sludge separating means to spray means in said scrubber container, and adding ammonium chloride to the slurry or liquor sprayed into said container in sufficient quantities to inhibit scale formation therein.
References Cited (Backward Citations)
US2090142A
Cited
US3360399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |