基于SNCR技术降低工业锅炉氮氧化物排放实验研究
发布时间：2018-07-28 15:33
【摘要】：煤炭是我国第一大能源资源,极大地推动着经济和社会的发展,然而工业生产造成的环境污染也日益凸显,尤其是氮氧化物污染问题。为减少工业锅炉氮氧化物排放,本文采用尿素为还原剂,以自制的单元体炉模拟工业锅炉进行SNCR脱硝技术实验研究。本文首先对尿素的热解特性进行了实验研究和分析,结果表明尿素热解可分为四个阶段,生成的气体产物为NH3和HNCO, NHs的回收率高于HNCO。在此基础上,采用单元体炉进行SNCR脱硝特性研究,主要考察了温度、NSR、氧浓度和不同还原剂对脱硝效果的影响。实验结果表明尿素脱硝的最佳脱硝温度925℃,最大脱硝效率81%,脱硝温度窗口150℃(875～1025℃),最优NSR为1.5,最佳φ(02)=2%,氨水整体脱硝特性优于尿素。但由于尿素物理性能等优势,具有更好的工业应用前景。最后考察H2O2、Na2CO3、C2H5OH三种添加剂对NOxOUT脱硝特性的影响。结果表明三种添加剂均能提高低温区间OH活性根浓度,从而提高其脱硝效率,并拓宽脱硝温度窗口,C2H5OH拓宽效果最好并使得最佳脱硝温度向低温方向偏移25℃；三种添加剂降低低温区间氨漏失量程度由大到小依次为Na2CO3、C2H5OH、H2O2;C2H5OH大幅增加低温段CO排放浓度；微量添加剂即可明显改善NOxOUT的脱硝效果；三种添加剂中,Na2CO3改善脱硝效果的优势明显。
[Abstract]:Coal is the largest energy resource in China, which greatly promotes the development of economy and society. However, the environmental pollution caused by industrial production is increasingly prominent, especially the problem of nitrogen oxide pollution. In order to reduce nitrogen oxide emissions from industrial boilers, SNCR denitrification technology was studied by using urea as reducing agent and a self-made unit furnace to simulate industrial boilers. In this paper, the pyrolysis characteristics of urea are studied and analyzed experimentally. The results show that the pyrolysis of urea can be divided into four stages. The gas products produced are NH3 and HNCO.The recovery rate of NHs is higher than that of HNCO. On this basis, the characteristics of SNCR denitrification were studied in a unit furnace. The effects of temperature, oxygen concentration and different reductants on denitrification were investigated. The experimental results show that the optimum denitrification temperature of urea denitrification is 925 鈩，
本文编号：2150726
[Abstract]:Coal is the largest energy resource in China, which greatly promotes the development of economy and society. However, the environmental pollution caused by industrial production is increasingly prominent, especially the problem of nitrogen oxide pollution. In order to reduce nitrogen oxide emissions from industrial boilers, SNCR denitrification technology was studied by using urea as reducing agent and a self-made unit furnace to simulate industrial boilers. In this paper, the pyrolysis characteristics of urea are studied and analyzed experimentally. The results show that the pyrolysis of urea can be divided into four stages. The gas products produced are NH3 and HNCO.The recovery rate of NHs is higher than that of HNCO. On this basis, the characteristics of SNCR denitrification were studied in a unit furnace. The effects of temperature, oxygen concentration and different reductants on denitrification were investigated. The experimental results show that the optimum denitrification temperature of urea denitrification is 925 鈩，
本文编号：2150726
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