SCR flue gas denitration device with various adjustment functions

Abstract

The invention discloses an SCR flue gas denitration device with various adjustment functions, comprising a denitration inlet flue having a plurality of sub-flues separated by flue partition boards, each sub-flue being provided with an independent flue baffle; a denitration reactor, arranged after the denitration inlet flue, provided with a plurality of layers of denitration catalysts, and having aplurality of parallel sub-zones separated by reactor partition boards, the number of the sub-zones being the same as the number of the sub-flues and the sub-zones correspondingly being connected to the sub-flues; an ammonia-spraying unit having a plurality of sub-ammonia-spraying units for respectively spraying ammonia to the plurality of sub-flues, the sub-ammonia-spraying units being located before the flue baffle; and a flue gas temperature regulation unit having a plurality of sub-air-distribution units for air distribution and temperature adjustment to the plurality of sub-flues, respectively, the sub-air-distribution units being located after the flue baffle. The inlet flue gas temperature of the denitration device provided by the invention can be flexibly adjusted, so as to realizeon-line regeneration and replacement of a catalyst and perform zoned adjustment and control on the denitration device.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, and more specifically, relates to an SCR flue gas denitrification device with multiple adjustment functions. Background technique [0002] Before the flue gas from industries such as electric power, coking, and steel is discharged into the atmosphere, it is necessary to install a denitrification device to reduce the NOx concentration in the flue gas, and it can only be discharged after the treatment reaches the standard. At present, the most widely used denitrification technology is the SCR denitrification process, that is, selective catalytic reduction technology. However, due to fluctuations in fuel conditions and operating conditions, the flue gas temperature at the denitrification inlet is likely to deviate from the active temperature range of the catalyst, resulting in a decline in denitrification efficiency and emissions that do not meet standards. For this situation, the ...

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Problems solved by technology

However, the cross-section of the flue and reactor of the denitrification device is usually relatively large, and the uniformity is difficult to guarantee

Especially in some special working conditions, it will cause further deterioration of the flow field inside the reactor

For example, the denitrification device disclosed in the patent document CN 104324612B, although the online regeneration and replacement of the catalyst can be realized, but when the catalyst is regenerated and replaced, due to the lack of targeted adjustment of the ammonia injection system, it is easy to cause the ammonia and flue gas to be distributed improperly in the reactor. Average, resulting in NOx emissions not up to standard

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