Dedusting and denitration integrated catalyst used for smoke-gas treatment and preparation method of dedusting and denitration integrated catalyst

Abstract

The invention relates to a dedusting and denitration integrated catalyst used for the smoke-gas treatment and a preparation method of the dedusting and denitration integrated catalyst, and belongs tothe technical field of catalysts. The method comprises five processes of mixing, extruding, drying, blocking a hole and calcining. The method changes the states of various through holes in a traditional honeycomb type SCR catalyst through the blocking technique, the smoke gas enters from an inlet end of the honeycomb type catalyst, and passes through the side wall of an adjacent hole of an unclosed hole on the inlet end, the smoke gas is fully filtered through the side wall, and the smoke dust is removed. Therefore, the purpose of dedusting is fulfilled, the retention time of the smoke gas inthe catalyst is also prolonged, the contact area between the smoke gas and the catalyst is increased, the efficiency of the catalyst is improved, meanwhile, the variety and the use level of a pore forming material are limited, the pore size distribution on the side wall in the integrated catalyst is changed, so that the catalyst is suitable for removing the dusts at various particle sizes, the purpose of simultaneously denitrating and dedusting is fulfilled finally, the integration of denitrating and dedusting is realized in the real sense, and the operation costs for smoke-gas treatment and investment in environmental protection are greatly reduced in a power plant and an industrial furnace.

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: CN105233644A, CN105315000A, CN106007722A, CN103495346A, etc. Due to high-temperature sintering, the energy consumption is large, and most of them are tubular ceramics Membrane, the specific surface area is small, 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

Images