METHOD FOR CONTROLLING WET TYPE WASTE GAS DESULFURIZATION APPARATUS

摘要

PURPOSE:To reduce the operation cost of a pump, by measuring the flow amount and SOx concn. of flue gas introduced from an inlet flue and operating a necessary number of spray stages corresponding to the SOx amount operated from the measured values. CONSTITUTION:The measuring signals of the flow amount detector 10 and inlet SOx densitometer 11 provided to an inlet flue 2 are sent to an operational controller 12 to operate the amount of SOx to be absorbed and the optimum number of absorbing spray stages 7 to be operated are calculated in addition to the desulfurization capacity in the cooling spray stage 8 and the cut-off valve 3 of recirculation lines 6 are operated so as to coincide with the calculated number of stages while unnecessary cut-off valves 13 are closed and a necessary number of recirculation pumps 5 are driven and unnecessary recirculation pumps 5 are stopped. The measuring signal from the outlet SOx densitometer 14 of an outlet flue 3 is sent to an operational controller 12 and the number of the recirculation pumps 5 to be operated and the number of the absorbing spray stages 7 are subjected to feedback control.