METHOD FOR STABLE ACIDIC GAS TREATMENT AND COMBUSTION EXHAUST GAS TREATMENT FACILITY

摘要

PROBLEM TO BE SOLVED: To provide a method for a stable acidic gas treatment and a combustion exhaust gas treatment facility that appropriately control an addition amount of two alkali agents with mutually different characteristics to be added to an acidic gas.SOLUTION: A combustion exhaust gas treatment facility 10 applied with the method for a stable acidic gas treatment comprises: a first adding device 42 and a second adding device 44 provided in an introduction passage 3; an acidic gas measurement device 30 provided in an exhaust passage 4; and an addition amount control device 50. The addition amount control device 50 includes: a first addition amount calculation section 60 that receives an acidic gas density signal S0 and outputs a first addition amount signal S21; and a second addition amount calculation section 70 that receives the first addition amount signal S21 and outputs a second addition amount signal S22. The first adding device 42 and the second adding device 44 on the basis of the first addition amount signal S21 and the second addition amount signal S22 respectively add a first alkali agent and a second alkali agent to a combustion exhaust gas flowing in the introduction passage 3.