Method for controlling combustion in coke oven battery

A method for controlling the combustion by flue in the operation of a coke oven battery which comprises the steps of:

• setting a target flue temperature pattern in a carbonizing cycle, i.e., in a cycle from coal charging to coke discharging, for each flue so as to achieve a target net coking time and a target soaking time given by a coke production schedule, on the basis of the details of coal charge consisting of the weight, the particle size, the moisture content, the volatile matter content and the timing of charging of the coal charge;
• measuring the temperature at the hairpin tops of the individual flues at certain intervals of time;
• calculating deviations of thus measured flue temperatures from said target flue temperature pattern by computer to set flow rates and calorific values of the fuel gas distributed to the individual flues with the use of said deviations;
• setting combustion waste gas drafts for the individual flues by computer so as to ensure optimum combustion in response to changes in the flow rates and the calorific values of the distributed fuel gas, and simultaneously adjusting said combustion waste gas drafts by means of a measured excess air ratio obtained by analyzing the combustion waste gases from the flues and a target excess air ratio;
• and bias-correcting said target flue temperature patterns with reference to the mean value of the measured flue temperatures, the measured net cooking times, the measured soaking times and the details of coal charge corresponding thereto.