SCR (Selective Catalytic Reduction) flue gas denitration and dust removal device

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) flue gas denitration and dust removal device. The SCR flue gas denitration and dust removal device comprises a tower body, a flue gas inlet is formed in the side wall of the tower body, and a flue gas outlet is formed in the bottom wall of the tower body. The device further comprises an annular frame, a plurality of first plate type catalysts detachably mounted on the annular frame, a rack detachably mounted on the inner bottom wall of the tower body, a plurality of second plate type catalysts filling the rack, a dust removal cover mounted on the side wall of the tower body, and a flue gas inlet pipe connected with the dust removal cover; and the annular frame is provided with an ammonia gas spraying piece and a turbulent flow piece used for mixing ammonia gas and flue gas, the top wall of the tower body is provided with an adjusting assembly used for driving the annular frame to ascend and descend, the dust removal cover is installed on the side wall, located at the flue gas inlet, of the tower body, and a dust removal assembly used for filtering the flue gas is arranged in the dust removal cover. According to the denitration and dust removal device, dust in flue gas is removed in advance, so that the probability that dust in the flue gas blocks pores of a catalyst is effectively reduced, the flue gas can be fully reacted, and the denitration efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to an SCR flue gas denitrification and dust removal device. Background technique [0002] (NOx) in flue gas is one of the main air pollutants. Traditional denitrification mainly uses selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), and the main application of selective catalytic reduction technology (SCR) Control the reaction of nitrogen compounds in the flue gas, and generate non-toxic and pollution-free nitrogen (N2) and water (H2O), to achieve the purpose of denitrification and environmental protection. [0003] The existing Chinese patent with authorized notification number CN206229206U discloses a SCR denitrification device for boiler flue gas, which includes a flue gas channel and an SCR denitrification reactor. The flue gas channel is sequentially installed with a high-temperature economizer, a high-temperature Air preheater,...

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Problems solved by technology

[0004] However, there are the following defects in the above technical solution: the denitrification device directly inputs the flue gas into the SCR denitrification reactor without pretreatment of the dust in the flue gas. During the reaction process of the flue gas, the dust is easy to accumulate on the SCR denitrification catalyst. Exacerbated the blockage of the catalyst pores, making the catalyst unable to recover the permeability, resulting in the increase of flue gas resistance and operating pressure difference, which in turn caused the flue gas to not be fully reacted, reducing the denitrification efficiency

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