为评估新能源大规模并网下，煤电机组频繁调峰引起选择性催化还原（selective catalytic reaction, SCR）脱硝装置氨逃逸率的变化问题，通过MATLAB编程方法构建SCR脱硝三维数值模型，就催化剂结构参数对脱硝性能的影响进行了研究。结果表明：催化剂孔节距对脱硝效率及氨逃逸率影响显著，反应温度为629.15K时，催化剂孔节距从6 mm增加到12 mm，SCR脱硝效率由72.63%降到51.04%，氨逃逸率由9.76%上升到25.1%；SCR脱硝性能随催化剂长度增加而增强，反应温度为639.15 K时，催化剂长度从300 mm增加到1 000 mm，脱硝效率由36.23%上升至69.05%；氨逃逸率由51.15%降低至8.90%。电厂负荷下降有利氨逃逸率降低，负荷从550 MW降低至330 MW脱硝效率由67.71%上升至73.28%，氨逃逸率由1.1%降低至0.14%。煤质劣化使氨逃逸率上升，煤质热值由16 747.2 J下降至15 491.16 J脱硝效率由71.14%上升至71.73%，氨逃逸率由1.47%上升至1.72%。

To evaluate the changes in ammonia escape rate of selective catalytic reaction (SCR) denitrification devices caused by frequent peak shaving of coal-fired power units under large-scale grid connection of new energy. A three-dimensional numerical model of SCR denitrification was constructed using MATLAB programming method, and the influence of catalyst structural parameters on denitrification performance was studied. The results show that the catalyst pore pitch has a significant impact on the denitrification efficiency and ammonia escape rate. At a reaction temperature of 629.15 K, the catalyst pore pitch increases from 6 mm to 12 mm, the SCR denitrification efficiency decreases from 72.63% to 51.04%, and the ammonia escape rate increases from 9.76% to 25.1%. The denitrification performance of SCR increases with the increase of catalyst length. At a reaction temperature of 639.15 K, the catalyst length increases from 300 mm to 1 000 mm, and the denitrification efficiency increases from 36.23% to 69.05%. The ammonia escape rate decreases from 51.15% to 8.90%. The decrease in power plant load is beneficial for the reduction of ammonia escape rate. The denitrification efficiency increases from 67.71% to 73.28% when the load decreases from 550 MW to 330 MW, and the ammonia escape rate decreases from 1.1% to 0.14%. The deterioration of coal quality leads to an increase in ammonia escape rate. The calorific value of coal decreases from 16747.2 J to 15491.16 J, and the denitrification efficiency increases from 71.14% to 71.73%. The ammonia escape rate increases from 1.47% to 1.72%.