Composite filter bag, dedusting and denitrification integrated device, and flue gas short-process dedusting and denitrification purifying method

Abstract

The invention discloses a composite filter bag, a dedusting and denitrification integrated device, and a flue gas low-temperature short-process dedusting and denitrification purifying method. The composite filter bag comprises a filter bag base body and a plurality of catalyst coating layers, wherein the multiple catalyst coating layers are coated to the inner surface of the filter bag base body;the active component of each catalyst coating layer selects one or multiple of mixtures of V2O5 / TiO2 (vanadium pentoxide / titanium dioxide), and V2O5-WO3 / TiO2 (vanadium pentoxide-tungsten trioxide / titanium dioxide). The dedusting and denitrification integrated device comprises a denitrification liquid storage tank, a microwave atomizing device and a bag type deduster, wherein the bag type dedustercomprises a plurality of composite filter bags; a denitrification liquid is sprayed into the microwave atomizing device from the denitrification liquid storage tank, then atomized, mixed with the to-be-treated flue gas, and sent into the deduster; the dust in the flue gas is firstly filtered and blocked by the outer surface of the composite filter bag in the bag type deduster, then falls into a dust hopper, and is collected; then, NOx is catalyzed to react with a denitrification agent under the catalyzing function of a catalyst coated to the inner surface of the composite filter bag, and is reduced into N2 (nitrogen gas), so that the flue gas can be purified. The composite filter bag has the advantages that the dedusting and the denitrification can be simultaneously performed; the technology process is simple and convenient, the manufacturing cost of engineering is low, and the like.

Description

technical field [0001] The invention relates to a composite filter bag, an integrated device for dust removal and denitrification, and a low-temperature short-range dust removal and denitrification purification method for flue gas, belonging to the technical field of flue gas purification in the field of environmental protection. Background technique [0002] With the improvement of my country's environmental quality standards, fine particulate matter (PM2.5) and NOx have become national key control objects, among which industrial furnaces such as smelting, coal burning, and cement are all key industries for emission control. Bag-type dust removal is the mainstream technology to achieve ultra-low dust emission. It uses the dust particles to be intercepted by the inertial force when the flue gas passes through the pores of the filter bag woven by the filter bag to achieve dust removal. During this process, the flue gas It can fully contact with the filter bag surface. SCR (S...

AI Technical Summary

Problems solved by technology

SCR (Selective Catalytic Reduction) is currently the most mature flue gas denitrification technology. It uses reducing agents to reduce nitrogen oxides to nitrogen and water under the action of solid catalytic materials. Low, if the SCR technology is used in the denitrification project of the above industries, it needs to be preheated, the energy consumption is large, and the operating cost is high

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