SNCR-PNCR combined denitration system for high-temperature furnace and flue gas denitration method

Abstract

The invention discloses a SNCR-PNCR combined denitration system for a high-temperature furnace and a flue gas denitration method, belonging to the field of treatment of flue gas from high-temperaturefurnaces. The SNCR-PNCR combined denitration system comprises an SNCR pretreatment system and a PNCR system. The SNCR pretreatment system comprises an ammonia-based reductant storage tank, a meteringsystem, an SNCR equalization system, an air compression system and an ammonia-based reductant injection system; and the SNCR pretreatment system controls NOx output concentration at 200-250 mg / m<3>. The PNCR system comprises a fan system, a dehumidification work cell, a PNCR equalization system and a PNCR powder spray gun system; and the PNCR system controls the NOx emission concentration of fluegas to be less than 100 mg / m<3>. The system of the invention comprises the SNCR pretreatment system and the PNCR system; and through cooperation between the SNCR pretreatment system and the PNCR system, the characteristics of low investment and low cost of original SNCR and high efficiency, stability and no pollution of original PNCR are given to full play, and the problems of low efficiency and excessive ammonia slip of SNCR technology are effectively avoided.

Description

technical field [0001] The invention relates to the field of high-temperature furnace flue gas treatment, in particular to an SNCR and PNCR synergistic combined denitrification system and flue gas denitrification method for high-temperature furnaces. Background technique [0002] At present, the tail gas NOx emission reduction of high-temperature furnaces such as cement kilns basically adopts a combination of primary emission reduction and secondary treatment technologies. Since the primary NOx emission reduction technology belongs to the combustion control technology in the generation of NOx, because of its low investment and quick results, It has almost no impact on normal production, so it is widely used, but its denitrification efficiency of 15% to 30% makes it necessary to combine secondary treatment technology in the control of NOx emissions. [0003] At present, there are two main denitrification technologies used in the secondary treatment of tail gas NOx in ...

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Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies in the prior art, to provide a SNCR and PNCR synergistic joint denitrification system for high-temperature furnaces, this system includes SNCR pretreatment system, PNCR system and public electrical control system, SNCR pretreatment system and The coordinated work of the two systems of the PNCR system can give full play to the low investment and low cost of the original SNCR and the high efficiency, stability, and pollution-free characteristics of the PNCR, effectively avoiding the low efficiency of the SNCR technology and the excessive ammonia escape, so that the entire cement kiln system, etc. The high-temperature furnace meets the national environmental protection NOx ultra-low emission requirements under the premise of safety and stability

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