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 denitri-fication was constructed using MATLAB programming method,and the influence of catalyst structural parameters on denitrification perform-ance 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 decrea-ses from 72.63%to 51.04%,and the ammonia escape rate increases from 9.76%to 25.1%.The denitrification performance of SCR increa-ses 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 from550 MW to 330 MW,and the ammonia escape rate decreases from1.1%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 denitrifica-tion efficiency increases from71.14%to 71.73%.The ammonia escape rate increases from1.47%to 1.72%.
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