US3556496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace profile temperature controller with ancillary signal producing means to maintain furnace at optimal temperature control levels and to minimize adverse effect of upsets
Assignee: Honeywell Inc
•
Filing: 1969-07-07
•
Granted: 1971-01-19
•
Expires: 1989-07-07
Abstract
Abstract A temperature-measuring control apparatus having opposing ancillary set point adjusting loop circuits for regulating the heat required to convert a granular material, for example: a cement mix into quality clinker which control apparatus is responsive to changes taking place in the overall temperature profile of the furnace and whose control action is not adversely effected when sudden upsets, such as a sudden surge of feed material being passed into the furnace occurs, which causes lengthening and/or shortening of the calcinating and burning zones.
Inventors
- 👤 Ernest Hucke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:05
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
A control apparatus to optimize the heat required to convert a granular material passing through a multizone furnace into a material having a preselected density and hardness prior to, during, and after a furnace upset occurs, comprising the combination of a master controller, a means operable to transmit a process variable signal to the controller whose magnitude is proportional to the rate of fuel being supplied by way of a final control means through the final end zone of the furnace, a transmitter operably connected to transmit a preselected set point signal to the controller and at least one pair of electrical current opposing set point process variable loops forming an ancillary signal-producing circuit operably connected with the transmitter to algebraically alter the magnitude of the set point signal that is being transmitted by the transmitter to the controller in accordance with temperature changes taking place in any other different zone of the furnace and the final control means being operably connected with the controller to regulate the rate of fuel flowing into the furnace in accordance with the difference in magnitude of the combined set point and process variable signals.
Claim 2
Dependent Claim
191 words
A control apparatus to optimize the heat required to convert a granular material passing through a multizone furnace into a material having a preselected density and hardness prior to, during, and after a furnace upset occurs, comprising the combination of a master controller, a means operable to transmit a process variable signal to the controller whose magnitude is proportional to the rate of fuel being supplied by way of a final control means through the final end zone of the furnace, a transmitter operably connected to transmit a preselected set point signal to the controller and at least one pair of electrical current opposing set point process variable loops forming an ancillary signal-producing circuit operably connected with the transmitter to algebraically alter the magnitude of the set point signal that is being transmitted by the transmitter to the controller in accordance with temperature changes taking place in any other different zone of the furnace and the final control means being operably connected with the controller to regulate the rate of fuel flowing into the furnace in accordance with the difference in magnitude of the combined set point and process variable signals.
Claim 3
Dependent Claim
88 words
The control apparatus defined in claim 1 wherein a pair of said opposing set poinT process variable loops are associated with two heating zones of the furnace which precede the final end zone of the furnace, said apparatus being operably connected with the transmitter to alter the magnitude of the set point signal being transmitted by the transmitter in accordance with the temperature of the last two mentioned zones and wherein the granular material is a cement mix and the end product produced by the furnace is clinker.
Claim 4
Dependent Claim
51 words
The control apparatus defined in claim 1 wherein each of said pair of opposing set point process variable loops are electrically connected to one another by means of a potentiometer, and a mechanical means is operably connected to said potentiometers to provide the same simultaneous joint resistance adjustment of each potentiometer.
Claim 5
Dependent Claim
50 words
The control apparatus as defined in claim 1 wherein each of said pair of opposing set point process variable loops are electrically connected to one another by means of a potentiometer and a mechanical means is operably connected to said potentiometers to provide a separate resistance adjustment of each potentiometer.
Claim 6
Dependent Claim
145 words
The control apparatus as defined in claim 1 wherein each of the process variable loops are connected to an associated process variable indicator and each of the set point loops are connected to an associated manually adjusted set point indicator, separate switches are employed to electrically cut off each of the set point loops with the transmitter, manual adjusting means is employed to line out the value of the set point indicator with the value on the process variable indicator while the switch is in a closed position and means to open the switch and connect each of the set point loops with the transmitter after the value of their set point indicator has been manually lined out with the value of the process variable indicator and a resulting zero ancillary error signal is being produced by each of said process variable set point loops.
Claim 7
Dependent Claim
140 words
The control apparatus defined in claim 1 wherein each of said pair of opposing set point process variable loops are electrically connected to one another by means of a potentiometer and a mechanical means is operably connected to said potentiometers to provide a separate resistance adjustment of each potentiometer and wherein an adjustment of the mechanical means associated with one pair of potentiometers associated with one of the pairs of loops that is different from the adjustment of the mechanical means connected with another pair of potentiometers associated with a different pair of process variable set point loops will provide a selective means by which one of said set point process variable loops is given greater importance in the roll it plays in producing the overall ancillary error signal that is produced by the sum of these pairs of loops.
Claim 8
Dependent Claim
53 words
The control apparatus defined in claim 1 wherein a temperature-sensing thermocouple to current-transducing means associated with the preheating zone of the furnace is operably connected to said process variable loop forming a portion of the ancillary signal-producing circuit to supply an electrical error signal proportional to the temperature of the preheating zone thereto.
Claim 9
Dependent Claim
63 words
The apparatus defined in claim 1 wherein a second transmitter operably connected with a primary temperature-sensing element in a burning zone of the furnace is employed to form a second process variable signal-producing circuit operably connected to the first mentioned transmitter to alter the magnitude of the set point signal produced thereby in accordance with temperature changes taking place in the burning zone.
Claim 10
Dependent Claim
80 words
The control apparatus defined in claim 1 wherein a pair of said opposing set point process variable loops are associated with the preheating and calcining zones of the furnace and are operably connected with the transmitter to alter the magnitude of the set point signal being transmitted by the transmitter in accordance with the temperature of the respective preheating and calcining zones and wherein tHe granular material is cement mix and the end product produced by the furnace is clinker.
Claim 11
Dependent Claim
137 words
The control apparatus defined in claim 1 wherein a pair of said opposing set point process variable loops are associated with the preheating and calcining zones of the furnace and are operably connected with the transmitter to alter the magnitude of the set point signal being transmitted by the transmitter in accordance with the temperature of the respective preheating and calcining zones and wherein the granular material is cement mix and the end product produced by the furnace is clinker and a second transmitter operably connected with a primary temperature-sensing element in a burning zone of the furnace is employed to form a second process variable signal-producing circuit operably connected to the first mentioned transmitter to alter the magnitude of the set point signal produced thereby in accordance with temperature changes taking place in the burning zone.
References Cited (Backward Citations)
US3366374A
Cited
US3381946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |