Annular flue gas denitrification device for sandwich hearth

Abstract

The invention relates to an annular flue gas denitrification device for a sandwich hearth, and belongs to the technical field of waste gas treatment. The obtained annular flue gas denitrification device for the sandwich hearth cannot cause the phenomenon of flue gas mixing leakage treatment, flue gas to be treated enters into a denitrification hearth uniformly in all directions from the bottom ofa hearth sandwich and an annular flue gas inlet, the air inlet distribution is uniform, the contact of spiral flue gas and a denitrification catalyst coating is more sufficient, and the contact time is also more sufficient, so that the denitrification effect is obvious, smoke inside flue gas can be oscillated and removed by an oscillation resistance dust filter gauze, and even if a part of smoke dust is not removed, the unremoved smoke dust can be thrown away by rotating centrifugal force after being in contact with a furnace assembly, so that dust deposition blockage cannot occur, the abrasion for the catalyst coating is also low, through an experiment, the denitrification rate of the device for flue gas can reach 90% or more, the content of smoke dust with the grain diameter of greater than 200 meshes in flue gas is lower than 2%, and the device has wide application prospects.

Description

technical field [0001] The invention relates to an annular flue gas denitrification device of a sandwich furnace, belonging to the technical field of waste gas treatment. Background technique [0002] Nitrogen oxides are the main air pollutants recognized by countries all over the world, and are the main causes of acid rain, ozone layer destruction, photochemical smog formation, ecological environment impact and global warming. From a global perspective, fuel combustion, especially coal combustion, is the main man-made source of nitrogen oxide environmental pollution. With the rapid development of the national economy and the continuous increase of coal-fired generating units, the emission of nitrogen oxides is bound to increase year by year, and the removal of nitrogen oxides has also been brought to an unprecedented height. [0003] In order to further reduce NOx emissions, flue gas denitrification must be carried out. Among many denitrification technologies, selective c...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention: for the current common denitrification devices, due to the serious uneven distribution of the flue gas entering the denitrification device, the flow rate of the flue gas on one side is too high, and the flow rate of the flue gas on the other side is too low, resulting in a low flow rate Areas are prone to ash accumulation and clogging, and the wear of the catalyst in the area with high flow rate is aggravated, and the contact between the flue gas and the catalyst is insufficient, which affects the denitrification efficiency. A sandwich furnace annular flue gas denitrification device is provided.

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