Burn profiles for coke operations
The present technology is generally directed to systems and methods for optimizing the burn profiles for coke ovens, such as horizontal heat recovery ovens. In various embodiments the burn profile is at least partially optimized by controlling air distribution in the coke oven. In some embodiments, the air distribution is controlled according to temperature readings in the coke oven. In particular embodiments, the system monitors the crown temperature of the coke oven. After the crown reaches a particular temperature range the flow of volatile matter is transferred to the sole flue to increase sole flue temperatures throughout the coking cycle. Embodiments of the present technology include an air distribution system having a plurality of crown air inlets positioned above the oven floor.
1. A system for controlling a horizontal heat recovery coke oven burn profile, the system comprising:
a horizontal heat recovery coke oven having (i) an oven chamber being at least partially defined by an oven floor, opposing oven doors, opposing sidewalls that extend upwardly from the oven floor between the opposing oven doors, and an oven crown positioned above the oven floor, (ii) at least one air inlet, and (iii) at least one sole flue, beneath the oven floor, in fluid communication with the oven chamber;
a temperature sensor disposed within the oven chamber;
at least one air inlet, positioned to place the oven chamber in fluid communication with an environment exterior to the horizontal heat recovery coke oven;
at least one uptake channel having an uptake damper in fluid communication with the at least one sole flue; the uptake damper being selectively movable between open and closed positions; and
a controller operatively coupled with the uptake damper and temperature sensor, the controller being adapted to (i) receive a plurality of successively increasing temperature changes detected by the temperature sensor over a carbonization cycle inside the oven chamber, and (ii) move the uptake damper through a plurality of increasingly flow restrictive positions, until the temperature changes in the oven chamber reach a peak temperature, to gradually reduce a negative pressure draft over the increasingly flow restrictive positions of the uptake damper, whereby a rate at which the oven chamber attains the peak temperature during the carbonization cycle is reduced.
2. The system of claim 1 , wherein the at least one air inlet includes at least one crown air inlet positioned in the oven crown above the oven floor.
3. The system of claim 2 , wherein the at least one crown air inlet includes an air damper that is selectively movable between open and closed positions to vary a level of fluid flow restriction through the at least one crown air inlet.
4. The system of claim 1 , wherein the controller is further operative to increase a temperature of the at least one sole flue above a designed sole flue operating temperature for the horizontal heat recovery coke oven by moving the uptake damper in a manner that reduces the negative pressure draft over a plurality of separate flow reducing steps, based on the plurality of temperature changes in the oven chamber.
5. The system of claim 1 , wherein the controller is configured to move the uptake damper to:
one of the plurality of flow restrictive positions when a temperature of approximately 2200° F. to 2300° F. is detected;
another of the plurality of flow restrictive positions when a temperature of approximately 2400° F. to 2450° F. is detected;
another of the plurality of flow restrictive positions when a temperature of approximately 2500° F. is detected;
another of the plurality of flow restrictive positions when a temperature of approximately 2550° F. to 2625° F. is detected;
another of the plurality of flow restrictive positions when a temperature of approximately 2650° F. is detected; and
another of the plurality of flow restrictive positions when a temperature of approximately 2700° F. is detected.