Method and apparatus for cement kiln control
Abstract
Abstract A METHOD AND APPARATUS FOR IMPROVING THE CONTROL OF A ROTARY CEMENT KILN WHEREIN THE FUEL RATE SET POINT AND THE EXIT GAS RATE SET POINT ARE NORMALLY CONTROLLED. DURING A NORMAL RANGE OF KILN DISTURBANCES, THE CONTROL OF FUEL RATE SET POINT IS BASED UPON KILN DRIVE MOTOR TORQUE MEASUREMENTS IN CONJUNCTION WITH FEEDBACK SIGNALS GENERATED BY A DYNAMIC KILN MODEL WHICH STORES A RECORD OF PAST CONTROL ACTIONS. CONTROL OF THE EXIT GAS RATE SET POINT IS BASED UPON MEASUREMENTS OF GAS TEMPERATURE AT A SELECTED INTERMEDIATE AREA OF THE KILN. OXYGEN CONTENT OF THE EXIT GAS IS MONITORED AND EMPLOYED TO EXERCISE OVERRIDING CONTROL TO INSURE THAT NO COMBUSTIBLES WHICH MIGHT CAUSE AN EXPLOSION APPEAR IN THE EXIT GAS. ABNORMAL DISTURBANCES ALTER THE KILN SPEED TO THEREBY EFFECT A MORE RAPID PROCESS RESPONSE TO THE ABNORMAL DISTURBANCE.
Inventors
- 👤 Myron Robert Hurlbut
- 👤 James William Lane
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |