Zr-TiO_(2)催化剂对燃煤NO析出特性的影响及其催化机理  

Effect of Zr-TiO_(2)catalyst on NO emission from coal-burning and its catalytic mechanism

作　　者：王淑勤[1,2,3] 付豪 程伟良 付懿[1] WANG Shu-qin;FU Hao;CHENG Wei-liang;FU Yi(Department of Environmental Science and Engineering,North China Electric Power University,Baoding 071003,China;Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control,North China Electric Power University,Baoding 071003,China;Key Laboratory of Regional Energy System Optimization of Ministry of Education,North China Electric Power University,Beijing 10084,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 10084,China)

机构地区：[1]华北电力大学环境科学与工程系,河北保定071003 [2]华北电力大学河北省电站烟气多污染物协同控制重点实验室,河北保定071003 [3]华北电力大学区域能源系统优化教育部重点实验室,北京100084 [4]华北电力大学能源动力与机械工程系,北京100084

出　　处：《燃料化学学报》2021年第7期909-917,共9页Journal of Fuel Chemistry and Technology

基　　金：The project was supported by the National Basic Research Program of China (2018YFB060420103).

摘　　要：采用浸渍法与微波法制取改性的Zr-TiO_(2),利用管式炉进行劣质煤NO析出实验,探究了脱硫剂、不同方法制备的改性TiO_(2)对劣质煤NO排放的影响及煤种的适应性,并对制备的Zr-TiO_(2)及其煤焦进行XRD、BET、SEM、XPS、TGA表征分析,得出脱硝机理。结果表明,脱硫剂的添加会促进NO的析出,在燃烧温度850℃、氧气流量40 mL/min、脱硫剂为MgO时,催化剂为浸渍法5%Zr-TiO_(2)时NO的排放量最低,比纯TiO_(2)低51.0%,比同条件下纯煤燃烧时低84.6%;对选用的10个煤种的适应性实验结果表明,制备的浸渍法5%Zr-TiO_(2)催化剂能够适用于硫分<3%、灰分<30%的煤种,拓宽了催化剂的应用范围;Zr的掺杂抑制了晶粒增长,增强了活性组分,使得吸附氧含量增多,促进了催化过程中元素价态的转化,加速了挥发分的析出,起到了助燃作用,增大了煤焦的比表面积,增强了煤焦的异相还原能力。The effect of desulfurizer,modified TiO_(2)prepared by different methods on the NO emission from inferior coal burning and the adaptability of coal type were studied by using a tube furnace.The prepared Zr-TiO_(2)and the char were characterized by XRD,BET,SEM,XPS,TGA,and the mechanism of denitrification was explored.The results show that the addition of desulfurizer can promote NO emission.When the combustion temperature is 850℃,oxygen flow rate is 40 mL/min and the desulfurizer is MgO,the NO emission is the lowest as the catalyst of 5%Zr-TiO_(2)prepared by impregnation method is added,which is 51.0%lower than that with addition of pure TiO_(2)and 84.6%lower than that with pure coal under the same conditions.The catalyst 5%Zr-TiO_(2)can be applied to the coal with sulfur<3%and ash<30%,having a wide application range.The doping of Zr can inhibit the growth of grain,enhance the active component,increase the content of adsorbed oxygen,promote the transformation of the valence states of the elements,accelerate the devolatilization of volatiles,promote the combustion,increase the specific surface area of chars,and enhance the ability of heterogeneous reduction of chars.

关 键 词：劣质煤 NO析出特性 Zr-TiO_(2) 催化作用 

分 类 号：X511[环境科学与工程—环境工程]