Middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device

Abstract

The invention relates to a middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device. The integrated device comprises a desulfurization, dust-collection and purification section, an desorption, ammonia-spraying and mixing section and a denitration reaction section which are integrated in a tower body from bottom to top, wherein the desulfurization, dust-collection and purification section comprises an ash bin, a closed dust discharging valve, a flue gas inlet, an airflow uniform-distribution and flow-guiding plate, filter bags and a pulse-jet device; the desorption, ammonia-spraying and mixing section comprises an ammonia-spraying structural body, a thermal desorption gas conveying-jetting structural body and mixed flow-equalizing structural bodies; the denitration reaction section comprises a denitration catalyst and a purified flue gas outlet. Compared with the prior art, the integrated device has the beneficial effects that (1) the processes of desulfurization, dedusting and denitration of flue gas as well as the thermal desorption of the denitration catalyst are integrated; (2) the service life of the denitration catalyst is long; (3) the denitration efficiency is high; (4) ammonia gas and flue gas as well as high-temperature thermal desorption gas and flue gas are in full contact with each other; (5) the denitration catalyst can be regenerated through online thermal desorption; (6) a denitration catalyst dust-cleaning system can be omitted.

Description

technical field [0001] The invention relates to the technical field of medium and low temperature flue gas desulfurization and denitrification, in particular to an integrated device for medium and low temperature flue gas desulfurization, dust removal and denitrification and denitrification catalyst thermal analysis. Background technique [0002] Flue gas NH 3 -SCR denitration technology can be roughly divided into three types according to the temperature of the flue gas it treats: the first is high-temperature flue gas denitrification, and the temperature of the flue gas is The temperature of the flue gas is 200-300°C; the third is the low-temperature denitrification process, and the temperature of the flue gas is 120-220°C. [0003] 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 gas deni...

AI Technical Summary

Problems solved by technology

However, some engineering 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 denitrification efficiency at medium and low temperatures

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