Patent US3287601A successfully refreshed from Google Patents.
Patent US3873331A successfully refreshed from Google Patents.
US3873331A
Expired / Lapsed
US
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Process for fluid calcining cement raw meal
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1973-08-22
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Granted: 1975-03-25
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Expires: 1993-08-22
Abstract
Abstract A new process for fluid calcining cement raw meal using a fluidized furnace equipped between a rotary kiln and a suspension preheater and having a separate heat source is provided. This process comprises dividing an air stream to be fed into the fluidized furnace into two parts and introducing one part thereof into a fluidized bed of the fluidized furnace and the other part thereof into a space above the fluidized bed for the purpose of increasing a calcining capacity of the fluidized furnace and at the same time reducing a running cost thereof remarkably.
Inventors
- 👤 Marekata Kondo
- 👤 Seiwa Fukuda
- 👤 Toyohiko Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:07
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/434
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A PROCESS FOR FLUID CALCINING CEMENT RAW MEAL USING A SEPARATE HEAT SOURCE COMBINED WITH A SUSPENSION PREHEATING TYPE CEMENT CLINKER BURNING PROCESS, THE IMPROVEMENT COMPRISING REGULATING THE HEIGHT OF A FLUIDIZED BED AS LOW AS POSSIBLE WHILE MAINTAINING SAID BED IN A STABILIZED STATE, SAID BED CONSISTING MAINLY OF A FLUIDIZING MEDIUM AND CEMENT RAW MEAL AND THE PARTICLE SIZE DISTRIBUTION OF SAID FLUDIZING MEDIUM BEING NOT OVERLAPED WITH THAT OF SAID CEMENT RAW MEAL, DIVIDING AN AIR STREAM INTO TWO PARTS, INTRODUCING ONE PART OF SAID AIR STREAM INTO SAID FLUDIZED BED SO AS TO BURN FUEL CHARGED THEREINTO AND TO GASIFY THE REMAINDER OF SAID FUEL THEREIN WITH HEAT GENERATED BY SAID BURNING OF THE FUELM AND INTRODUCING THE OTHER PART OF SAID AIR STREAM INTO A SPACE ABOVE SAID FLUDIZED BED SO AS TO BURN SAID GASIFIED FUEL DISPERSING UNIFORMLY IN DILUTED CONCENTRATION IN SAID SPACE FOR CALCINING SAID CEMENT RAW MEAL FLOATING IN DENSE CONCENTRATION THEREIN.
Claim 2
Dependent Claim
162 words
IN A PROCESS FOR FLUID CALCINING CEMENT RAW MEAL USING A SEPARATE HEAT SOURCE COMBINED WITH A SUSPENSION PREHEATING TYPE CEMENT CLINKER BURNING PROCESS, THE IMPROVEMENT COMPRISING REGULATING THE HEIGHT OF A FLUIDIZED BED AS LOW AS POSSIBLE WHILE MAINTAINING SAID BED IN A STABILIZED STATE, SAID BED CONSISTING MAINLY OF A FLUIDIZING MEDIUM AND CEMENT RAW MEAL AND THE PARTICLE SIZE DISTRIBUTION OF SAID FLUDIZING MEDIUM BEING NOT OVERLAPED WITH THAT OF SAID CEMENT RAW MEAL, DIVIDING AN AIR STREAM INTO TWO PARTS, INTRODUCING ONE PART OF SAID AIR STREAM INTO SAID FLUDIZED BED SO AS TO BURN FUEL CHARGED THEREINTO AND TO GASIFY THE REMAINDER OF SAID FUEL THEREIN WITH HEAT GENERATED BY SAID BURNING OF THE FUELM AND INTRODUCING THE OTHER PART OF SAID AIR STREAM INTO A SPACE ABOVE SAID FLUDIZED BED SO AS TO BURN SAID GASIFIED FUEL DISPERSING UNIFORMLY IN DILUTED CONCENTRATION IN SAID SPACE FOR CALCINING SAID CEMENT RAW MEAL FLOATING IN DENSE CONCENTRATION THEREIN.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |