Automatic draft control system for coke plants

Patent metadata

Field	Value
Publication number	US-12195671-B2
Application number	US-202318321530-A
Country	US
Kind code	B2
Filing date	May 22, 2023
Priority date	Aug 17, 2012
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A coke oven includes an oven chamber, an uptake duct in fluid communication with the oven chamber, the uptake duct being configured to receive exhaust gases from the oven chamber, an uptake damper in fluid communication with the uptake duct, the uptake damper being positioned at any one of multiple positions, the uptake damper configured to control an oven draft, an actuator configured to alter the position of the uptake damper between the positions in response to a position instruction, a sensor configured to detect an operating condition of the coke oven, wherein the sensor includes one of a draft sensor, a temperature sensor configured to detect an uptake duct temperature or a sole flue temperature, and an oxygen sensor, and a controller being configured to provide the position instruction to the actuator in response to the operating condition detected by the sensor.

First claim

What is claimed is:

1. An oven, comprising:
an oven chamber configured to receive coal and produce coke from the coal;
a front door at one side of the oven;
an uptake duct in fluid communication with the oven chamber and configured to receive exhaust gases from the oven chamber;
an uptake damper in fluid communication with the uptake duct and configured to be positioned at one of a plurality of positions including fully opened and fully closed, wherein, in operation, the position of the uptake damper controls an oven draft;
an actuator configured to alter the position of the uptake damper between the plurality of positions in response to a position instruction;
a plurality of oven sensors comprising a draft sensor configured to detect the oven draft, a temperature sensor configured to detect an uptake duct temperature or a sole flue temperature, and an oxygen sensor configured to detect an uptake duct oxygen concentration in the uptake duct; and
a controller in communication with the actuator and with the plurality of sensors, such that the controller receives a signal from each of the plurality of sensors that corresponds to a measured process value of the coke oven, the controller being configured to provide the position instruction to the actuator, based at least in part on signals received from each the plurality of sensors over a period of time, wherein providing the position instruction causes the actuator to alter the position of the uptake damper and maintain the oven draft at or above a predetermined target oven draft for the oven, wherein the target oven draft varies over a duration of a coking cycle based on an elapsed time of the coking cycle, such that the target oven draft is adjusted (i) a first time period after a beginning of a cycle, and (ii) a second time period after the first time period has elapsed, wherein the coking cycle is defined as being after the coal is charged into the oven chamber and the front door is closed.

2. The oven of claim 1 , wherein providing the position instruction to the actuator occurs over an entire duration of the coking cycle.

3. The oven of claim 1 , wherein at least one of the sensors is positioned in the oven chamber.

4. The oven of claim 3 , wherein at least a different one of the sensors is positioned in the sole flue.

5. The coke oven of claim 1 , wherein the temperature sensor is positioned in the uptake duct.

6. The coke oven of claim 1 , wherein providing the position instruction causes the actuator to alter the position of the uptake damper to thereby maintain the uptake duct oxygen concentration within an oxygen concentration range.

7. The coke oven of claim 1 , wherein the oxygen sensor is positioned in the uptake duct.

8. The coke oven of claim 1 , wherein providing the position instruction is based at least in part on maintaining the oven draft at least at 0.1 inches of water.

9. The coke oven of claim 1 , wherein the controller is further operative to vary the targeted oven draft over the coking cycle by stepwise reducing the target oven draft as a function of elapsed time.

10. A plant, comprising:
a plurality of ovens each including—
an oven chamber configured to receive coal and produce coke from the coal;
a front door at one side of the oven;
an uptake duct in fluid communication with the oven chamber and configured to receive exhaust gases from the oven chamber;
an uptake damper in fluid communication with the uptake duct and configured to be positioned at one of a plurality of positions including fully opened and fully closed, wherein, in operation, the position of the uptake damper controls an oven draft;
an actuator configured to alter the position of the uptake damper between the plurality of positions in response to a position instruction; and
a plurality of sensors including a draft sensor configured to detect the oven draft, a temperature sensor configured to detect an uptake duct temperature or a sole flue temperature, and an oxygen sensor; and

a controller in communication with each of the actuators and the plurality of sensors of the plurality of ovens, the controller being configured to automatically control the uptake damper of each oven, based at least in part on signals received from each of the plurality of sensors for the respective oven, wherein automatically controlling the uptake dampers causes the oven draft to be maintained at or above a targeted oven draft, wherein the target oven draft varies over a duration of a coking cycle based on an elapsed time of the coking cycle, such that the target oven draft is adjusted (i) a first time period after a beginning of the coking cycle, and (ii) a second time period after the first time period has elapsed, wherein the coking cycle is defined as being after the coal is charged into the oven chamber and the front door is closed.

11. The coke plant of claim 10 , wherein automatically controlling the uptake damper of each oven comprises automatically adjusting a position of the respective uptake damper between one of a plurality of positions including fully opened and fully closed.

12. The coke plant of claim 10 , wherein automatically controlling the uptake damper of each oven comprises providing position instructions to automatically adjust a position of the respective uptake damper between one of a plurality of positions, and wherein providing the position instruction causes the actuator to alter the position of the uptake damper such that, in operation, excess air enters into the oven in response to an overheat condition detected by the temperature sensor.

13. The coke plant of claim 12 , wherein the position instructions provided by the controller are linearly proportional to the differences in the time-averaged operating conditions detected by the respective plurality of sensors.

14. The coke plant of claim 12 , wherein the controller is further operative to time-average differences in operating conditions detected by the respective plurality of sensors.

15. The coke plant of claim 12 , wherein position instructions provided by the controller are non-linearly proportional to the differences in the time-averaged operating conditions detected by the respective plurality of sensors.

16. The coke plant of claim 10 , wherein the controller is further operative to maintain a constant time-averaged oven draft within a predefined tolerance of the target oven draft throughout the coking cycle.

17. The coke plant of claim 10 , wherein automatically controlling the uptake damper of each oven occurs over an entire duration of the coking cycle.

18. The coke plant of claim 10 , wherein at least one of the sensors is positioned in the oven chamber and at least one of the sensors is positioned in the sole flue.

19. The coke oven of claim 10 , wherein the temperature sensor is positioned in the uptake duct.

Assignees

• Suncoke Tech & Development Llc

Inventors

• Quanci John F
• Chun Peter
• Kaplarevic Milos J
• Reiling Vince G

Classifications

• C10B21/20

  Methods of heating ovens of the chamber oven type · CPC title

• C10B5/04

  with cross-over inter-connections · CPC title

• C10B15/02 Primary

  with floor heating · CPC title

• F22B1/18

  the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines · CPC title

• C10B45/00

  Other details · CPC title