Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Nobuyasu Sakata

Nobuyuki Ukai

Moritoshi Murakami

Rikuma Shijo

Toshihiro Sato

Katsumi Nochi

Masashi Kiyosawa

Kiyonori Kushioka

An air pollution control device is an air pollution control device for reducing the amounts of NOx and Hg contained in flue gasfrom a boiler. The air pollution control device includes: NHCl solution supply meansfor spraying an NHCl solutionby a spray nozzleinto a flue gas ductat the downstream of the boiler; a mixerprovided on the downstream side of a region where NHCl is gasified, for promoting mixing, with the flue gas, HCl and NHwhich are generated when NHCl is gasified; a reduction-denitration deviceincluding a denitration catalyst for reducing NOx in the flue gaswith NHand for oxidizing Hg under the coexistence with HCl; and a wet desulfurization devicefor reducing the amount of Hg oxidized in the reduction-denitration deviceusing a limestone-gypsum slurry

Air pollution control device

The air pollution control device includes: NHCl solution supply meansfor spraying an NHCl solutionby a plurality of spray nozzlesinto a flue gas ductat the downstream of the boiler; a reduction-denitration deviceincluding a denitration catalyst for reducing NOx in the flue gaswith NHand for oxidizing Hg under the coexistence with HCl; and a wet desulfurization devicefor reducing the amount of Hg oxidized in the reduction-denitration deviceby using a limestone-gypsum slurry. The NHCl solution supply meanssupplies the NHCl solutionfrom the spray nozzlesso as to prevent the NHCl solutionfrom being adhered to an inner wall of the flue gas ductthrough which the flue gasis flowing.

Air pollution control device and method for reducing amount of mercury in flue gas

An air pollution control apparatus includes at least one denitration catalyst layer for reducing the amounts of nitrogen oxides in flue gas from a boiler and oxidizing mercury with hydrogen chloride sprayed into the flue gas. Spraying pipe headersare disposed in a flue gas duct. The spraying pipe headersare inserted into the flue gas ductand arranged in a direction orthogonal to the direction of a gas flow in the flue gas duct. At least four spray nozzles-to-are disposed at intervals on the spraying pipe headerto form a vertical vortex flowin the gas flow direction. A swirling diffuser plate is disposed on an opening side of the spray nozzles to form the vertical vortex flow in the gas flow direction, wherein the swirling diffuser plate has a flat shape at one side parallel to the spraying pipe header and a wavy shape corresponding to the nozzle intervals on the header at the other side. The diffusion of hydrogen chloride is thereby facilitated in a rapid manner. Therefore, the number of the nozzles can be reduced, and the uniformity of the concentration of hydrogen chloride at the location of the catalyst can be ensured even when the spacing between the nozzles is increased.

Air pollution control apparatus and air pollution control system

An air pollution control apparatusaccording to an embodiment of the present invention has a denitration catalyst layerthat removes NOx in flue gas, and atomizes HCl into the flue gasto oxidize Hg, and also includes a swirling-flow generating memberA that includes a swirling-flow generating-member body being partitioned to correspond to each passage of the denitration catalyst layerand a plurality of swirling-flow generating vanes arranged on the partition inner walls to generate a turbulent flow, on an inletside of the denitration catalyst layer. With this configuration, a laminar flow of the flue gasin a flue gas ductis changed to a swirling flow, thereby enabling to increase a contact time between the flue gasand a denitration catalyst and to improve the oxidation reaction efficiency between Hg in the flue gasand the denitration catalyst.

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Tokyo, Japan

Nobuyasu Sakata