Abstract: This boiler has a flue in which a reducing agent supplying device and a selective reduction catalyst are provided, a bypass flow path bypassing economizers is provided, and a first closing device partially closing the bypass flow path and a second closing device partially closing the flue are also provided. A plurality of first closing members, serving as the first closing device, are provided along the direction in which exhaust gas flows through the flue at a predetermined spacing in the width direction of the flue. A plurality of second closing members, serving as the second closing device are provided along the vertical direction at a predetermined spacing in the width direction of the flue. The first closing members and the second closing members are arranged so as to be displaced from each other in the width direction of the flue.

Abstract: Provided are: an exhaust gas treatment catalyst capable of improving NO conversion rate when performing denitrification using CO as a reducing agent, and improving CO oxidation rate when oxidizing CO present in the exhaust gas; a method for producing an exhaust gas treatment catalyst; and an exhaust gas treatment system. The exhaust gas treatment catalyst is a catalyst which uses CO as a reducing agent to treat exhaust gas from a sintering furnace, and contains: a support that is a metal oxide or metal sulfate; and an active metal containing at least iridium supported by the support, wherein the specific surface area of the catalyst is 100 m2/g or less, and the crystallite size of iridium in the catalyst is 10-25 nm.

Abstract: This boiler has a flue in which a reducing agent supplying device and a selective reduction catalyst are provided, a bypass flow path bypassing economizers is provided, and a first closing device partially closing the bypass flow path and a second closing device partially closing the flue are also provided. A plurality of first closing members, serving as the first closing device, are provided along the direction in which exhaust gas flows through the flue at a predetermined spacing in the width direction of the flue. A plurality of second closing members, serving as the second closing device are provided along the vertical direction at a predetermined spacing in the width direction of the flue. The first closing members and the second closing members are arranged so as to be displaced from each other in the width direction of the flue.