Dust-removing and denitration integrated catalyst and preparation method thereof

Abstract

The invention relates to a dust-removing and denitration integrated catalyst and a preparation method thereof, and belongs to the technical field of a catalyst. The method comprises eight processes ofmixing, extruding, drying, blocking pores, calcining, loading an active substance, drying again and calcining. According to the method, the state of each through hole in the traditional honeycomb SCRcatalyst is changed through a pore blocking technology, flue gas enters from the inlet end of the catalyst, and the flue gas is completely filtered through the side wall of the adjacent pore of the unclosed pore at the inlet end and by utilizing the side wall. Therefore, the dust-removing aim is fulfilled, the retention time of the flue gas in the catalyst is prolonged, the contact area of the flue gas and the catalyst is increased and the efficiency of the catalyst is improved; meanwhile, the variety and the use amount of a pore forming agent are limited and the pore diameter distribution ofthe side wall in the catalyst is changed, so that the catalyst is suitable for removal of dust with various grain size, the denitration and dust-removing aims are finally achieved, dust-removing anddenitration integration is realized in true sense, and the environment-protecting investment and the operation cost of flue gas treatment of a power plant and an industrial kiln furnace are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a dust removal and denitrification integrated catalyst for flue gas treatment and a preparation method thereof. Background technique [0002] With the advancement of national ecological civilization construction, air pollution control and emission regulations have also been continuously improved and improved. Firstly, coal-fired power plants have fully realized ultra-low emission transformation, and are required to meet the pollutant emission limit of gas turbine units, that is, the benchmark oxygen content of 6%. Under the condition, smoke dust, SO 2 , NO x Emission concentrations are not higher than 10mg / m 3 、35mg / m 3 , 50mg / m 3 , which greatly increases the investment cost and operating cost of the power plant. In the field of industrial boilers, such as cement, glass, steel, coking and other industries, the emission of particulate matter and NO x , SO 2 E...

AI Technical Summary

Problems solved by technology

[0003] At present, traditional dust removal, denitrification, and desulfurization are carried out step by step. The main flue gas treatment technology route adopted by coal-fired power plants for ultra-low emissions is still: denitrification-dust removal-desulfurization. In order to improve the removal efficiency, the use of denitrification catalysts is continuously increased. Combined use of various dust removal technologies and wet desulfurization technologies, while industrial furnace flue gas treatment mostly follows the power plant flue gas treatment technology. Therefore, the existing dust removal, denitrification, and desulfurization overall investment is large and operating costs are high, which greatly increases the power plant. Environmental protection operating costs of industrial kilns and other industries

[0004] Although there are many reports on the integration of dust removal and denitrification in the field of power plant flue gas treatment, they are basically not integrated technologies in the true sense, but an integrated system formed by simply combining various existing complex denitrification and dust removal processes , but each process in the system still runs independently

There are also relevant reports on the integrated technology of dust removal and denitrification in industrial kilns, but most of them are formed by high-temperature sintering, such as: CN105233644 A, CN105315000 A, CN106007722 A, CN103495346 A, etc. Due to high-temperature sintering, the energy consumption is large, and most It is a tubular ceramic membrane with a small specific surface area, resulting in increased volume usage and increased investment

In addition, the patent CN104190399A loads the active substance on the carrier, and the carrier is formed into a thin film, but it is not suitable for industrial application

Patent CN104524886A reports a filter bag plus catalytic material, but the filter bag has poor wear resistance, short service life and high operating costs

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