活性焦法烧结烟气脱硝率影响因素解析

为了明确活性焦在烧结烟气净化系统循环使用过程中脱硝性能变化及影响烧结烟气脱硝率的主要工艺参数,提高活性焦法烧结烟气净化效率,通过红外光谱分析和模拟试验研究循环使用中活性焦性能变化及其对脱硝率的影响,并通过生产数据统计分析明确影响活性焦法烧结烟气脱硝率的主要工艺参数及其影响规律。结果表明,经循环使用,活性焦表面酚基和醌基数量增加,对NO吸附量降低,导致活性焦前期脱硝率下降,而氨气预吸附处理可大幅提高其前期脱硝率;随脱硝段高度位置下降,脱硝率经历100%、迅速降低、缓慢升高直至平衡等阶段。其次,脱硝率与氨氮比、O2体积分数、NOx质量浓度、解析温度呈正相关,与H2O体积分数、SO2质量浓度、烟气流量、活性炭床温度呈负相关,其中,氨氮比、O2体积分数和NOx质量浓度对脱硝率影响最大,工艺参数优化过程中应着重关注。

Analysis of affecting factors of activated coke denitrationefficiency for sintering flue gas

In order to clarify the denitration performance changes of activated coke during the recycling process in the sintering flue gas purification system and the main operating parameters affecting the denitration rate of sintering flue gas,to improve the purification efficiency of sintering flue gas by activated coke method,FTIR and simulation experiments were carried out to study the changes of activated coke property and its effect on denitration efficiency during recycling. The main process parameters affecting the activated coke denitration efficiency for sintering flue gas and its influence law were clarified through statistical analysis of production data. The results show the quantity of phenol and quinine on activated coke increase after recycling,hence the NO adsorption capacity decreases,which leads to the decrease of initial denitration efficiency of active coke. While the pre-adsorption of ammonia can greatly increase the initial denitration efficiency,it can be deduced that the denitration efficiency from top to bottom of cross-flow denitration tower experienced 100%,rapid decreasing,slow rising until equilibrium. Secondly,denitration efficiency is positively correlated with the NH₃-NOx ratio,O₂ volume percent,NO_x mass concentration,and desorption temperature,and negatively correlated with the H₂O volume percent,SO₂ mass concentration,flue gas flow,and activated carbon bed temperature. Besides,NH₃-NO_x ratio,O₂ volume percent,and NO_x mass concentration have great influence on the denitration efficiency,which should be focused on in the parameter optimization process.