Powder coke multi-layer cyclone circulation coupling microwave auxiliary-heating integrated denitration apparatus

Abstract

The invention provides powder coke multi-layer cyclone circulation coupling microwave auxiliary-heating integrated denitration apparatus. The apparatus comprises a multi-layer cyclone bed, a booster fan (5) connected to the multi-layer cyclone bed, a screw feeder (6) connected to the bottom of the multi-layer cyclone bed, a dust remover (7) positioned behind the multi-layer cyclone bed, a conveyor(10) connected to the bottom of the multi-layer cyclone bed, and a microwave device; the multi-layer cyclone bed comprises a vertical-mounted cyclone cylinder (1) and an n-layer cyclone plate (2) arranged in the cyclone cylinder (1), wherein the n is selected from 3-5; the microwave device is connected with the multi-layer cyclone bed; and the conveyer (10) is provided with a centrifugal fan (9).Compared with the regular active coke, powder coke has a larger specific surface area and a faster reaction characteristic, and selective heating can be carried out by adopting microwave, so that theintegrated denitration apparatus provided by the invention has the advantages of high heat transfer efficiency, strong mass transfer, uniform distribution of a flow field, controllable residence timeand the like, and has strong technical extension applicability.

Description

technical field [0001] The invention provides a powder coke multi-layer swirl circulation coupling microwave auxiliary heating integrated denitrification device, which is a denitrification device integrating powder coke multi-layer swirl circulation, coupling, and microwave auxiliary heating. It is suitable for the field of pollutant purification, especially In the field of low temperature denitrification. Background technique [0002] There are mainly three ways to control the NOx generated by coal combustion: one is the pre-combustion control technology, that is, fuel denitrification; the other is the NOx control technology during combustion, that is, combustion denitrification, which is the combustion method and production process. Improve and reduce the generation of NOx; the third is post-combustion NOx control technology, that is, flue gas denitrification technology, which is an intellectual control of nitrogen oxides in the flue gas generated after combustion, and has...

AI Technical Summary

Problems solved by technology

The first method is more difficult to research and costly, and no commercial operation case has been seen so far

The use of staged combustion and low-nitrogen burners in combustion can effectively reduce the amount of NOx produced, but it is difficult to meet the increasingly stringent air emission standards by simply using this method

[0003] The post-combustion NOx control technologies mainly include SNCR and SCR. The denitrification efficiency of SNCR technology is not high. At present, it is mainly used as a simple means for low NOx emission control of small boilers. SCR technology is generally used in coal-fired power plants in my country. The gas first passes through the economizer and then enters the SCR reactor. The reaction temperature is 350-450°C. In this temperature range, the catalyst loses its activity due to the influence of soot, SO2 and H2O. The catalyst needs to be replaced regularly, resulting in high operating costs for the SCR catalyst process. At the same time, the waste catalyst containing V, W, Ti and other heavy metals is hazardous waste, causing hidden dangers of environmental pollution

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