US3926129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporative concentration of waste sludges with incinerator exhaust gases
Assignee: Dorr Oliver Inc
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Filing: 1975-01-03
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Granted: 1975-12-16
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Expires: 1995-01-03
Abstract
Abstract Waste sludges containing a high proportion of water are concentrated by an evaporative process prior to fluid bed incineration. The evaporation is carried out in a scrubberevaporator into which air at high temperature is passed, the high temperature achieved by heat exchange with the incinerator exhaust gases. The exhaust gases are also passed through an additional heat exchanger to preheat the fluidizing-combustion air feed to the fluid bed reactor. The exhaust gases are treated in a venturi scrubber before discharge to the atmosphere.
Inventors
- 👤 Clarence J Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/048; C02F11/00; C02F11/06; F; F23; F23G; F23G5/00; F23G5/44; F23G5/46; F23G7/00; F23G7/001; Y; Y02; Y02W; Y02W10/00; Y02W10/40; Y10; Y10S; Y10S159/00; Y10S159/03; Y10S159/905
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
207 words
A fluid bed incineration system for combustible waste streams having a high proportion of water therein wherein the waste feed liquor is subjected to evaporative concentration using the waste heat of said fluid bed incinerator comprising, a fluid bed reactor having a constriction plate for supporting a fluidized bed of particulate material thereabove and defining a windbox therebelow, heat exchangers arranged to receive the exhaust gases of said fluid bed incinerator, means for conducting the exhaust gas stream from said fluid bed reactor through said heat exchangers and thence to a venturi scrubber, blower means for providing air in volume to said heat exchangers, conduit means for conducting preheated air from a first of said heat exchangers to said windbox as the fluidizing air for said fluid bed incinerator, an evaporator connected to said second of said heat exchangers by a conduit whereby a heated air flow is provided to said evaporator, means for introducing a weak feed liquor into said evaporator for exposure to said heated air flow to drive off water from said weak liquor and thereby provide a concentrated feed liquor, means for conducting said concentrated feed liquor from said evaporator to said fluid bed reactor for direct injection into the fluidized bed thereof.
Claim 2
Dependent Claim
207 words
A fluid bed incineration system for combustible waste streams having a high proportion of water therein wherein the waste feed liquor is subjected to evaporative concentration using the waste heat of said fluid bed incinerator comprising, a fluid bed reactor having a constriction plate for supporting a fluidized bed of particulate material thereabove and defining a windbox therebelow, heat exchangers arranged to receive the exhaust gases of said fluid bed incinerator, means for conducting the exhaust gas stream from said fluid bed reactor through said heat exchangers and thence to a venturi scrubber, blower means for providing air in volume to said heat exchangers, conduit means for conducting preheated air from a first of said heat exchangers to said windbox as the fluidizing air for said fluid bed incinerator, an evaporator connected to said second of said heat exchangers by a conduit whereby a heated air flow is provided to said evaporator, means for introducing a weak feed liquor into said evaporator for exposure to said heated air flow to drive off water from said weak liquor and thereby provide a concentrated feed liquor, means for conducting said concentrated feed liquor from said evaporator to said fluid bed reactor for direct injection into the fluidized bed thereof.
Claim 3
Dependent Claim
40 words
The incineration system of claim 1 wherein a first blower is provided for said first heat exchanger to provide an air flow thereto and a second blower is provided for said second heat exchanger to provide an air flow thereto.
Claim 4
Dependent Claim
33 words
The incineration system of claim 2 wherein an exhaust stack is provided on said evaporator to accommodate the exhaust stream of said evaporator composed of gases and vapor, for discharge into the atmosphere.
Claim 5
Dependent Claim
25 words
The incineration system of claim 3 wherein a recirculation circuit is provided for routing a portion of said concentrated feed liquor back to said evaporator.
Claim 6
Dependent Claim
29 words
The incineration system of claim 3 wherein gas cooling means and condensate collection means are provided for cooling the gas stream from said evaporator and handling the resultant condensate.
Claim 7
Dependent Claim
21 words
The incineration system of claim 1 wherein a single blower provides the air flow to said first and second heat exchangers.
Claim 8
Dependent Claim
42 words
The incineration system of claim 6 wherein said blower is directly connected by conduit means to said second heat exchanger and wherein the exit gas conduit of said evaporator is connected to said first heat exchanger for reheating of evaporator exit gases.
Claim 9
Dependent Claim
27 words
The incineration system of claim 7 wherein gas cooling means and condensate collection means are provided for cooling said exit gas stream and handling the resultant condensate.
Claim 10
Dependent Claim
24 words
The incineration system of claim 8 wherein a recirculation circuit is provided for returning a portion of said concentrated feed liquor to said evaporator.
Claim 11
Independent Claim
101 words
A method for fluid bed incineration of combustible waste liquors in which weak feed liquors are subjected to evaporative concentration using waste heat from the exhaust gases of said fluid bed incinerator, comprising the steps of, passing the exhaust gas of said fluid bed reactor through heat exchangers, heating air by passing air in volume through said heat exchangers, fluidizing the fluid bed in said reactor with said heated air, evaporating water from said weak feed liquor with said heated air to provide a strong feed liquor, injecting said strong feed liquor into said fluid bed reactor for destruction by combustion.
Claim 12
Independent Claim
101 words
A method for fluid bed incineration of combustible waste liquors in which weak feed liquors are subjected to evaporative concentration using waste heat from the exhaust gases of said fluid bed incinerator, comprising the steps of, passing the exhaust gas of said fluid bed reactor through heat exchangers, heating air by passing air in volume through said heat exchangers, fluidizing the fluid bed in said reactor with said heated air, evaporating water from said weak feed liquor with said heated air to provide a strong feed liquor, injecting said strong feed liquor into said fluid bed reactor for destruction by combustion.
Claim 13
Dependent Claim
49 words
The method of claim 10 wherein two heat exchangers are employed and separate air streams are directed into each heat exchanger for heating and these heated air streams are separately employed, the one to fluidize said fluid bed and the other to evaporate water from said weak feed liquor.
Claim 14
Dependent Claim
19 words
The method of claim 11 wherein the gas and vapor from the evaporation step is exhausted to the atmosphere.
Claim 15
Dependent Claim
31 words
The method of claim 12 wherein the gas and vapor are cooled to condense water vapor and low boiling compounds before the gas and vapor stream is exhausted to the atmosphere.
Claim 16
Dependent Claim
42 words
The method of claim 10 wherein two heat exchangers are employed, serially arranged with a venturi evaporator therebetween, and a single air stream is passed through the heat exchangers and evaporator to the fluid bed reactor for fluidizing the fluidized bed therein.
Claim 17
Dependent Claim
60 words
The method of claim 14 wherein the hot gas and vapor stream produced in the evaporator is cooled to condense low-boiling compounds and water vapor, removing the condensed constituents, reheating the remaining gas and vapor stream in one of said heat exchangers and introducing the reheated gas and vapor stream into the fluized bed reactor as the fluidizing medium therefor.
References Cited (Backward Citations)
US2171535A
Cited
US3351030A
Cited
US3703919A
Cited
US3733271A
Cited
US3736111A
Cited
US3801514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |