摘要 |
PROBLEM TO BE SOLVED: To provide flue gas desulfurization equipment and method for contriving effective utilization of waste heat of exhaust gas in a cleaning system for cleaning combustion exhaust gas to be exhausted from a boiler of a thermal power plant, etc., and effectively utilizing the exhaust gas.SOLUTION: In flue gas treatment equipment, a flow passage of exhaust gas from a boiler 1 is sequentially provided with: denitration equipment 2; an air preheater 3; a gas cooler 4; a dust collector 5; and desulfurizing equipment 7, the gas cooler 4 is provided with a heat medium circulation line 29 with a heat medium flow rate control valve 19, a heat medium bypass line 30 for circulating a heat medium between the gas cooler 4 and a binary power generating facility 17 which utilizes heat of the exhaust gas collected by the line 29, by bypassing the binary power generating facility 17, a control valve 19, and the cooler 4 is connected to the heat medium circulation line 29, and a supply amount of the heat medium in the heat medium circulation line 29 to be supplied to the cooler 4 and a supply amount of a heat medium in the bypass line 30 are controlled according to exhaust gas temperature at an outlet of the cooler 4 so that the exhaust gas temperature at the outlet of the cooler 4 becomes a predetermined value. |