METHOD FOR CONTROLLING COMBUSTION AIR FLOW RATE AND CONTINUOUS MULTIBAND-TYPE HEATING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling a combustion air flow rate capable of sufficiently reducing exhaust gas loss.;SOLUTION: This method for controlling a combustion air flow rate to be supplied to burners in a continuous multiband type heating furnace including a furnace body having a plurality of heating zones provided in series, and a plurality of burners respectively arranged in the heating zones includes: a step for measuring a fuel flow rate to a burner, a combustion air flow rate to the burner, oxygen concentration in a furnace and furnace temperature of every heating zone; a step for calculating an entering air flow rate of every heating zone on the basis of the fuel flow rate, combustion air flow rate, oxygen concentration in the furnace and furnace temperature of every heating zone, and a nonsteady mass conservation expression considering exhaust gas flow and residence in the furnace; a step for calculating a fuel air flow rate to the burners, which can hold a desired air ratio in the plurality of heating zones on the basis of the entering air flow rate of every heating zone; and a step for adjusting the fuel air flow rate to be supplied to the burners to the calculated fuel air flow rate.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT