Medium and low temperature denitration, dedusting and thermo-analysis integrated method and device

Abstract

The invention relates to a medium and low temperature denitration, dedusting and thermo-analysis integrated method and a device. The device is formed by combining a dedusting filter bag layer, a denitration catalyst layer and a field thermo-analysis regeneration structure layer and comprises a particulate collection and discharge section, a flue gas purification and filtration section, a mixed analysis regeneration section and a denitration reaction section. The denitration catalyst structure layer is arranged on the top of the bag purification layer, and the dedusting is carried out before denitration, so that abrasion of dust to a denitration catalyst can be reduced. The thermo-analysis regeneration structure layer is arranged between the denitration catalyst structure layer and the bag purification layer; analysis and regeneration of the denitration catalyst are achieved by supplying high-temperature analysis gas on line regularly; continuous efficient use of the medium and low temperature catalyst is kept; and normal operation of a flue gas denitration technology is unaffected. Static pressure mixing devices are arranged in the mixed analysis regeneration section, and uniform distribution of a velocity field and a temperature field of flue gas on a cross section of the device is achieved by a pressure equalization effect of the static pressure mixing devices and the filter bag resistance layer.

Description

technical field [0001] The invention relates to the field of medium and low temperature flue gas denitrification, which can realize the integration of flue gas dust removal, denitrification and on-site thermal analysis. Background technique [0002] Flue gas NH 3 -SCR denitrification technology can be roughly divided into three types according to the flue gas temperature it handles: [0003] The first type: high-temperature flue gas denitrification, the temperature of the flue gas is 300-400 ° C; [0004] The second type: medium temperature denitrification process, the temperature of the treated flue gas is 200-300 °C; [0005] The third type: low-temperature denitrification process, the temperature of the flue gas is 120-220 °C; [0006] The first high-temperature flue gas denitrification technology has been widely used in power plant denitrification processes around the world. The second and third denitrification technologies are currently being trial run in the flue ga...

AI Technical Summary

Problems solved by technology

Some projects are limited by the site, and it is impossible to install bag filter and denitrification reactor at the same time

In addition, the low-temperature denitrification catalyst will oxidize a small part of sulfur dioxide into sulfur trioxide, and the ammonium bisulfate produced by the reaction of sulfur trioxide and ammonia will condense into viscous substances when the flue gas temperature is lower than 230°C. This viscous substance will affect the low temperature denitrification efficiency

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