在线型梯度燃烧分解炉及其配套燃烧器的开发与应用

Development and Application of Online Gradient Calciner and Supporting Burner

梯度燃烧技术通过多级调控分解炉进风、喂料、喷煤方式,将分解炉炉膛空间进行功能分区,建立“强贫氧还原区—弱贫氧还原区—燃烬区”的燃烧气氛环境,从而实现NOx源头减排。本文开发了在线型梯度燃烧分解炉及配套旋流分散燃烧器,可将强还原区停留时间增加至2.5~3.0s,提升了自脱硝效果。该技术在滕州东郭生产线应用后,自脱硝效率>70%,分解炉出口稳定控制NOX≤260mg/Nm3,窑尾NOx排放浓度30~50mg/Nm3,熟料氨水用量<2.5kg/t,实现了水泥窑烟气NOx的低成本超低排放。

Gradient combustion technology divides the furnace space of the calciner into functional partitions through multi-stage control of the air inlet,feeding,and coal injection,establishing a combustion atmosphere environment of"strong lean oxygen reduction zone-weak lean oxygen reduction zone-combustion zone",thereby achieving source emission reduction of NOX.This article develops an online gradient combustion calciner and a supporting swirl dispersion burner,which can increase the residence time of the strong reduction zone to 2.5~3.0 seconds and improve the self denitrification effect.The application of this technology in the Tengzhou Dongguo production line shows that,the self denitrification efficiency can reach over 70%,the stable control of NOX at the outlet of the calciner is below 260mg/Nm3,and the NOX emission control of the chimney gas is 30~50mg/Nm3.the dosage of ammonia water used in the clinker production is less than 2.5kg/t,achieving low-cost and ultra-low emission of NOX in cement kiln flue gas.