High-dust smoke SCR (selective catalytic reduction) denitrification device applied to cement kiln

Abstract

The invention provides a high-dust smoke SCR (selective catalytic reduction) denitrification device applied to a cement kiln. The device comprises an inlet flue, an ammonia injection grid, a connecting flue, a flow equalizing-guiding plate, a rectification grid, a reactor shell, a catalytic layer, a combined soot blower and an outlet flue. The inlet flue, the connecting flue, the reactor shell and the outlet flue are sequentially connected along the smoke direction; the ammonia injection grid is arranged on the inlet flue; the flow equalizing-guiding plate and the rectification grid are both arranged in the connecting flue; the rectification grid is positioned below the flow equalizing-guiding plate; the catalytic layer is arranged in the reactor shell; the combined soot blower is positioned in the corresponding position of the reactor shell. The high-dust smoke SCR denitrification device applied to the cement kiln has the advantages that the denitrification efficiency under the high-dust smoke characteristics can be guaranteed, the ammonia escape is reduced, and the blockage of the catalytic layer is prevented.

Description

technical field [0001] The invention relates to a cement kiln SCR denitrification technology, in particular to an SCR denitrification device applied to cement kiln high-dust flue gas. Background technique [0002] Existing low-nitrogen burners in cement kilns, calciner staged combustion technology and SNCR denitrification technology, NO x emission reduction level only [0003] 30~60%, NO x Emissions are still greater than 300mg / Nm 3 , it is difficult to meet the increasingly stringent national environmental protection emission standards. According to the analysis of years of research and testing by professional environmental protection agencies at home and abroad, the cement industry NO x To achieve less than 200mg / Nm 3 The use of SCR denitrification technology will be the only way to meet the emission standards. [0004] SCR denitrification technology refers to the combination of NOx in flue gas with NH under the catalytic action of catalyst. 3 The reaction converts t...

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Problems solved by technology

However, this invention has problems in the optimal design of the reactor, ammonia injection control, soot blowing control and adjustment, etc., and it is difficult to deal with the high dust concentration flue gas characteristics of cement kilns

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