| 摘要 |
PURPOSE:To adjust temp., by providing a boiler outlet duct in the exhaust gas flow passage reaching the terminal outlet of a boiler from the firing furnace of the boiler through the spaces between the water tube groups of the boiler and adjusting the opening degrees of dampers attached to the duct and the boiler outlet. CONSTITUTION:The exhaust gas issued from the firing furnace 14 of a boiler enters an exhaust gas flow passage 30 from an introducing port 22 to heat the water tube groups 20 of the boiler and flowed out to an exhaust gas main flow passage 38 from an outlet duct 52 having a damper 50 mounted therein and a terminal outlet duct 36 having a damper 34 mounted therein and flowed through a denitration apparatus 40 to remove NOx. At this time, the relation between the opening degrees of the dampers 34, 50 and the temp. of the outlet exhaust gas is preliminarily calculated and the opening degrees of the dampers are automatically controlled by the temp. sensor provided to the upstream side of the denitration apparatus to control temp. |
