垃圾焚烧炉SNCR脱硝特性影响因素分析及优化

Analysis and Optimization of Influencing Factors of SNCR Denitration Characteristics of Waste Incinerator

垃圾焚烧发电法可以实现垃圾处理资源化、无害化,然而焚烧带来的氮氧化物污染问题依旧严峻。针对上述问题,建立焚烧炉燃烧与脱硝数值模型并构建物理模型,利用Fluent首先模拟气相组分燃烧过程并采用后处理方法获取NO与NH分布状态。然后基于燃烧结果模拟SNCR脱硝过程,研究喷射位置、喷枪数量、氨氮摩尔比以及喷射速度对于脱硝特性的影响规律,分析烟道区域内NO与NH分布状态、脱硝效率以及氨逃逸量的变化情况。结果表明喷射位置和氨氮摩尔比对于烟道区域内NO分布状态、脱硝效率具有较大影响。

The waste incineration power generation method can realize the recycling and harmlessness of waste treatment, but the problem of nitrogen oxide pollution caused by incineration is still serious.Aiming at the above problems, a numerical model of combustion and denitrification in an incinerator and constructs a physical model are established.Fluent is used to first simulate the combustion process of gaseous components and post-processing methods are used to obtain the NOdistribution status.Then based on the combustion results to simulate the SNCR denitrification process, study the influence of the injection position, the number of spray guns, the ammonia-nitrogen molar ratio and the injection speed on the denitrification characteristics, and analyze the changes of NOand NHdistribution in the flue area, denitrification efficiency and ammonia escape.The results show that the injection position and the ammonia-nitrogen molar ratio have a great influence on the distribution of NOin the flue area and the denitrification efficiency.