Patent US2833619A successfully refreshed from Google Patents.
US2833619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling the concentration of liquors from evaporators
Assignee: Combustion Engineering Inc
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Filing: 1952-09-24
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Granted: 1958-05-06
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Expires: 1972-09-24
Abstract
No abstract record available.
Inventors
- 👤 Vincent P Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:57
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/10; D21C11/103; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
THE METHOD OF RECOVERING CHEMICALS FROM BLACK LIQUOR IN A RECOVERY UNIT INCLUDING A FURNACE, BOILER AND WASTE HEAT EVAPORATOR, COMPRISING THE STEPS OF NORMALLY SUPPLYING BLACK LIQUOR OF GIVEN LOW SOLID CONCENTRATION TO SAID WASTE HEAT EVAPORATOR; INCREASING THE CONCENTRATION OF SAID BLACK LIQUOR IN SAID EVAPORATOR TO A GIVEN HIGH VALUE BY NORMALLY DELIVERING WASTE GASES FROM SAID RECOVERY FURNACE AND BOILER TO SAID EVAPORATOR AFTER SAID WASTE HEAT GASES HAVE PASSED OVER AND AMONG THE HEAT ABSORBING SURFACES OF SAID BOILER AND PASSING SAID GASES THROUGH SAID EVAPORATOR WHERE A PORTION THEREOF CONTACT THE BLACK LIQUOR THEREIN PICKING UP MOISTURE THEREFROM; DELIVERING SAID HIGH CONCENTRATION LIQUOR INTO SAID RECOVERY UNIT AND BOILER AT A GIVEN RATE; AND MAINTAINING THE CONCENTRATION OF THE LIQUOR LEAVING SAID EVAPORATOR AND BEING DELIVERED INTO SAID FURNACE SUBSTANTIALLY CONSTANT AND THE TEMPERATURE OF THE GASES AS THEY LEAVE THE EVAPORATOR WITHIN PREDETERMINED LIMITS WHEN THE LIQUOR SUPPLIED TO THE EVAPORATOR DROPS BELOW SAID GIVEN LOW CONCENTRATION BY CONTROLLABLY BY-PASSING HOT WASTE GASES IN SAID BOILER TO INCREASE THE TEMPERATURE OF THE WASTE GASES DELIVERED TO SAID EVAPORATOR AND BY CONTROLLABLY DIRECTING A RELATIVE GREATER PORTION OF SAID GASES PASSING THROUGH THE EVAPORATOR INTO CONTACT WITH THE BLACK LIQUOR THEREIN TO THEREBY REDUCE THE TEMPERATURE OF SAID GASES PRIOR TO
Claim 2
Independent Claim
217 words
THE METHOD OF RECOVERING CHEMICALS FROM BLACK LIQUOR IN A RECOVERY UNIT INCLUDING A FURNACE, BOILER AND WASTE HEAT EVAPORATOR, COMPRISING THE STEPS OF NORMALLY SUPPLYING BLACK LIQUOR OF GIVEN LOW SOLID CONCENTRATION TO SAID WASTE HEAT EVAPORATOR; INCREASING THE CONCENTRATION OF SAID BLACK LIQUOR IN SAID EVAPORATOR TO A GIVEN HIGH VALUE BY NORMALLY DELIVERING WASTE GASES FROM SAID RECOVERY FURNACE AND BOILER TO SAID EVAPORATOR AFTER SAID WASTE HEAT GASES HAVE PASSED OVER AND AMONG THE HEAT ABSORBING SURFACES OF SAID BOILER AND PASSING SAID GASES THROUGH SAID EVAPORATOR WHERE A PORTION THEREOF CONTACT THE BLACK LIQUOR THEREIN PICKING UP MOISTURE THEREFROM; DELIVERING SAID HIGH CONCENTRATION LIQUOR INTO SAID RECOVERY UNIT AND BOILER AT A GIVEN RATE; AND MAINTAINING THE CONCENTRATION OF THE LIQUOR LEAVING SAID EVAPORATOR AND BEING DELIVERED INTO SAID FURNACE SUBSTANTIALLY CONSTANT AND THE TEMPERATURE OF THE GASES AS THEY LEAVE THE EVAPORATOR WITHIN PREDETERMINED LIMITS WHEN THE LIQUOR SUPPLIED TO THE EVAPORATOR DROPS BELOW SAID GIVEN LOW CONCENTRATION BY CONTROLLABLY BY-PASSING HOT WASTE GASES IN SAID BOILER TO INCREASE THE TEMPERATURE OF THE WASTE GASES DELIVERED TO SAID EVAPORATOR AND BY CONTROLLABLY DIRECTING A RELATIVE GREATER PORTION OF SAID GASES PASSING THROUGH THE EVAPORATOR INTO CONTACT WITH THE BLACK LIQUOR THEREIN TO THEREBY REDUCE THE TEMPERATURE OF SAID GASES PRIOR TO
Claim 3
Dependent Claim
140 words
A CHEMICAL RECOVERY UNIT FOR RECOVERING CHEMICALS FROM BLACK LIQUOR COMPRISING A FURNACE IN WHICH SAID BLACK LIQUOR IS BURNED, A BOILER ASSOCIATED WITH SAID FURNACE TO RECEIVE THE HOT COMBUSTION GASES THUS PROCUDED, MEANS WITHIN SAID BOILER OPERABLE TO CONTROL THE TEMPERATURE OF THE HOT COMBUSTION GASES AS THEY LEAVE THE BOILER, CONDUIT MEANS FOR SUPPLYING BLACK LIQUOR TO SAID FURANCE A DIRECT CONTACT EVAPORATOR COMPRISING A CONTAINER CONNECTED INTO SAID CONDUIT SO THAT THE BLACK LIQUOR FLOWS THROUGH THE LOWER PORTION THEREOF PRIOR TO ENTERING SAID FURNACE, MEANS FOR CONVEYING THE HOT COMBUSTION GASES LEAVING THE BOILER TO THE UPPER PORTION OF SAID EVAPORATOR FOR PASSAGE THERETHROUGH AOND MEANS DISPOSED IN SAID EVAPORATOR IN THE FLOW PATH OF THE HOT COMBUSTION GASES PASSING THERETHROUGH OPERABLE TO VARY THE PROPORTION OF SAID GASES THAT CONTACTS THE LIQUOR CONTAINED THEREIN.
Claim 4
Dependent Claim
140 words
A CHEMICAL RECOVERY UNIT FOR RECOVERING CHEMICALS FROM BLACK LIQUOR COMPRISING A FURNACE IN WHICH SAID BLACK LIQUOR IS BURNED, A BOILER ASSOCIATED WITH SAID FURNACE TO RECEIVE THE HOT COMBUSTION GASES THUS PROCUDED, MEANS WITHIN SAID BOILER OPERABLE TO CONTROL THE TEMPERATURE OF THE HOT COMBUSTION GASES AS THEY LEAVE THE BOILER, CONDUIT MEANS FOR SUPPLYING BLACK LIQUOR TO SAID FURANCE A DIRECT CONTACT EVAPORATOR COMPRISING A CONTAINER CONNECTED INTO SAID CONDUIT SO THAT THE BLACK LIQUOR FLOWS THROUGH THE LOWER PORTION THEREOF PRIOR TO ENTERING SAID FURNACE, MEANS FOR CONVEYING THE HOT COMBUSTION GASES LEAVING THE BOILER TO THE UPPER PORTION OF SAID EVAPORATOR FOR PASSAGE THERETHROUGH AOND MEANS DISPOSED IN SAID EVAPORATOR IN THE FLOW PATH OF THE HOT COMBUSTION GASES PASSING THERETHROUGH OPERABLE TO VARY THE PROPORTION OF SAID GASES THAT CONTACTS THE LIQUOR CONTAINED THEREIN.
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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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |