Modularized flue gas desulfurization, dust-removing and denitration integrated treatment system

Abstract

The invention relates to a modularized flue gas desulfurization, dust-removing and denitration integrated treatment system, and belongs to the technical field of flue gas treatment. The system includes a desulfurization system and a dust-removing and denitration system, wherein the dust-removing and denitration system includes a catalyst module formed with a plurality of honeycomb-like V-W-Ti catalysts, of which the two ends are staggered to block holes. In the treatment system, the desulfurization system is located before the dust-removing and denitration system, so that sulfur substances influe gas are removed in a dry desulfurization manner, thereby alleviating a problem of sulfur poisoning of the denitration catalyst. Furthermore, with the catalyst module for dust removal and denitration, the system is high in dust removal and denitration efficiency, is large in filter area and is small in installation size. The system can finally achieve simultaneous dust removal and denitrationat the same time to the flue gas; the catalyst has a honeycomb-like structure, so that compared with conventional tubular ceramic membrane filtering devives, a larger specific surface area is suppliedand usage amount of the catalyst is reduced, thus reducing investment cost; in addition, the honeycomb-like catalysts are assembled in a modularized manner, so that the system is convenient to install on site, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a modular integrated treatment system for flue gas desulfurization, dust removal and denitrification. Background technique [0002] The flue gas of industrial kilns, especially coal-fired boilers, contains dust, nitrogen oxides and sulfur dioxide. The above-mentioned flue gas components discharged into the atmosphere will cause a series of air pollution phenomena such as smog and acid rain, thus threatening the ecological environment and human health. With the increasingly stringent requirements of the country for air pollution control in recent years, flue gas desulfurization, denitrification, and dust removal technologies are also constantly innovating. At present, the process flow of desulfurization, denitrification, and dust removal widely used in coal-fired power plants is: plate or honeycomb V-W-Ti system catalyst)—dust removal (by bag dust removal, c...

AI Technical Summary

Problems solved by technology

With the increasingly stringent requirements of the country for air pollution control in recent years, flue gas desulfurization, denitrification, and dust removal technologies are also constantly innovating. At present, the process flow of desulfurization, denitrification, and dust removal widely used in coal-fired power plants is: plate or honeycomb V-W-Ti system catalyst)—dust removal (by bag dust removal, cyclone dust removal, electric dust removal and other dust removal processes)—wet desulfurization (limestone-gypsum method), but the above three processes operate independently, and the equipment is bulky , and the structure is complex, so the energy consumption is high and the floor area is large

In addition, the traditional process usually puts the SCR denitrification catalyst at the front end of the process. During the long-term operation, the SO in the flue gas 2 , dust, etc. will cause the denitrification catalyst to deactivate, which will greatly affect the life of the catalyst

[0003] The flue gas desulfurization, denitrification and dust removal integrated device and process disclosed in patent CN104667715A mainly have the disadvantages of placing dust removal and denitrification at the front end of the process, and it is difficult to avoid the problem of denitrification catalyst poisoning; fluidized bed denitrification requires high flue gas flow rate, increasing In addition, the dust removal pipe is on the top of the powder denitrification catalyst, so the smoke will enter the denitrification catalyst, affecting the denitrification efficiency

[0004] Patent CN105233644A discloses an integrated composite process system for dust removal, desulfurization and denitrification of coal-fired flue gas, but ceramic tubes and ceramic filter membranes are often used in this process system, and the cost is high, and the process steps are complicated, which is not suitable for wide application

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