| abstract |
(57) [Abstract] [PROBLEMS] To provide an exhaust gas treatment method capable of reducing borofluoride ions generated in a desulfurization apparatus and discharged to the outside, and reducing the utility and equipment capacity of treatment equipment. [Composition] Combustion exhaust gas containing SOx, dust, boron component, and fluorine component is absorbed and removed by a circulating absorption liquid in the dust removal tower 3, and the exhaust gas after absorption and dust removal is introduced into the absorption tower 5, and In the processing method of absorbing SOx of calcium with a calcium-based absorption liquid, based on the fuel supply amount 26 to the combustion furnace and the fuel property analysis result 25, Al, Fe, Sn, The addition amount 28 in the dust removal column for Be and one or more of its compounds (F fixing agent) was determined, and the determined amount of F The fixative is added to the absorbent in the dust removal tower. |