▎ 摘　　要

NOVELTY - Selective catalytic reaction device (200) comprises a combustion gas inlet duct part (100) into which combustion gas is introduced and aqueous ammonia is injected, a selective catalytic reaction part and a reactive combustion gas discharge part (300), where the selective catalytic reaction part is provided with at least one catalyst layers (220) in a reaction tower (210) and the reaction tower arranged vertically; and a gas-liquid mixture diffusion part (400) interposed between the combustion gas inlet duct and the selective catalytic reaction part, and is used for uniformly diffusing the gas-liquid mixture of the combustion gas introduced into the combustion gas inlet duct into the inside of the reaction tower and the sprayed aqueous ammonia. The combustion gas inlet duct part has an anti-corrosion coating layer containing 3-triethoxysilane propylamine 10-40 pts. wt., 20-50 pts. wt. tetraethoxysilane and 3-10 pts. wt. stearic acid based on 100 pts. wt. dipropylene glycol. USE - The selective catalytic reaction device is useful for industrial flue gas treatment e.g. incineration facilities or diesel engine exhaust gas treatment. ADVANTAGE - The selective catalytic reaction device increases the gas-liquid contact effect and reaction efficiency of the combustion gas and aqueous ammonia through structural improvement, promotes uniform spreading of mixed gas, which is a gas-liquid mixture into the reaction tower, achieve the usefulness of improving the removal performance of nitrogen oxides contained in the combustion gas compared to the traditional one and by maintaining the uniformity of the ammonia concentration mixed with the combustion gas flowing into the catalyst existing in the reaction tower and the uniformity of the introduced mixed gas; promotes smooth reaction activity of nitrogen oxides contained in the combustion gas introduced into the reaction tower; increases the contact efficiency and reaction activity by the catalyst, and increases the service life of the catalyst, so that the replacement time can be delayed, and achieves the usefulness of reducing the overall operating cost; and prevents the generation of a differential pressure in the device system, and the generation of a load, and achieves the usefulness of preventing local damage to the catalyst layer. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the selective catalytic reaction device (Drawing includes non-English language text). 100Combustion gas inlet duct part 200Selective catalytic reaction device 210Reaction tower 220Catalyst layers 300Reactive combustion gas discharge part 400Gas-liquid mixture diffusion part