TECHNIQUE FOR CONTROL OF COKE OVEN TEMPERATURE

摘要

PURPOSE:To maintain stable conditions of combustion in an oven, such as the pressure at the oven top and the waste gas temperature, to thereby realize a proper carbonization state distribution in a carbonization chamber and a reduction in the unit cost of heat consumed for carbonization by controlling the coke oven temperature according to a specified technique. CONSTITUTION:In performing combustion control based on a difference between a measured coke oven temperature and a set oven temperature, the upper and lower limit values of the fuel gas flow rate are established so as to give a range of change in the pressure at the oven top of 2mmAq or leas, a fuel gas flow rate within the range between the upper and lower limit values is determined based on a difference between an actual oven temperature and a set oven temperature, and the fuel gas flow rate thus determined is used to control combustion; at the same time, the gas flow rate values thus determined and the duration for which these values are outside the range between preestablished upper and lower limit values are monitored and, when said duration exceeds a set time, the upper and lower limit values of the fuel gas flow rate are changed stepwise and the changed values are used to control combustion, thus accomplishing oven temperature control.