Double-moving-bed reactor, application thereof to flue gas dedusting and denitrating integration device and treatment method

Abstract

The invention provides a double-moving-bed reactor, an application thereof to flue gas dedusting and denitrating integration device and a treatment method. The double-moving-bed reactor comprises a gas inlet cavity, a filter material bed, a catalyst bed and a gas outlet cavity which are adjacent in sequence, and the gas inlet cavity, the filter material bed, the catalyst bed and the gas outlet cavity are separated through a first partition board, a second partition board and a third partition board respectively. According to the device, integrated dedusting and denitrating can be realized, flue gas firstly enters the filter material bed for dedusting, most ultrafine dust in the flue gas is removed, influence of the dust on a catalyst is eliminated, then the flue gas enters the catalyst bedfor removing nitrogen oxides, the two processes are integratedly performed in one reactor, the dedusting and denitrating effects are good, dust removal rate almost reaches 100%, and content of the nitrogen oxides also meets the first level discharge standard. Meanwhile, by means of recycling of a filter material and the catalyst, continuous and stable operation of the dedusting and denitrating process is realized.

Description

Technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to a double moving bed reactor and its use and processing method in an integrated device for flue gas dust removal and denitration. Background technique [0002] At present, there are a large number of glass furnaces, glass frit furnaces, high-temperature tunnel furnaces, and hazardous waste incinerators in China. The combustion temperature of these furnaces generally exceeds 1200℃, and the flue gas produced by combustion contains a large amount of thermal nitrogen oxides. (NO x ), the concentration usually reaches 2000mg / Nm 3 , NO x It will cause harm to the environment, human body, animals and plants, so the flue gas must be denitrified to meet the emission standards. At present, the mainstream technology for flue gas denitrification is selective catalytic reduction (SCR) technology. The principle is to use ammonia as a reducing agent to remove NO in flue gas under conditio...

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Problems solved by technology

[0003] In the existing flue gas SCR denitrification technology, because the flue gas usually contains fine dust with strong alkalinity, adhesion and corrosiveness, the existence of these dusts can easily poison the catalyst used for denitrification, so it must be carried out before flue gas denitrification. Dust removal

In the prior art, bag filters or electrostatic precipitators are usually selected for dust removal first, but these dust removal devices are difficult to remove the above-mentioned fine dust. For this reason, many corresponding researches have been carried out at home and abroad in order to solve this problem

[0004] CN 103480272 A discloses a glass kiln flue gas dedusting, denitrification and desulfurization process and device. The device includes high-temperature electric precipitator, fuel oil hot blast stove, SCR reactor, waste heat boiler, desulfurization absorption tower and other equipment, but the device dust collector , the reactor and the absorption tower are all set separately, the device and process are complicated, the conditions are high, and the required cost is high, and the electrostatic precipitator cannot completely remove the alkaline fine dust in the flue gas; CN 104492260 A discloses a glass Kiln flue gas dedusting and denitrification integrated process, ammonia and NO x After mixing, the dust in the flue gas is filtered by the fine filter material, and then enters the common catalyst for denitrification reaction, but the invention is easy to cause fine dust blockage and cannot achieve continuous denitrification; CN 106994299 A discloses a single-channel glass kiln flue gas The denitrification device and its denitrification method, the device adds a denitrification device and an automatic control system on the basis of a glass furnace, but it cannot eliminate the poisoning of the catalyst by the fine dust in the flue gas, making the flue gas denitrification impossible to be carried out continuously

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