Research on the Formation Mechanism of Ammonium Sulfate in Flue Gas Denitrification of Coal fired Power Plants
The efficiency of selective catalytic reduction systems in coal-fired power plants is significantly affected by the formation of ammonium sulfide salts in flue gas.In response to this issue,the formation mechanism of ammonium sulfide salts in selective catalytic reduction technology was studied and discussed,and a quantitative calculation model for the generation rate of ammonium sulfide salts was constructed based on this.The experiment was conducted at different temperatures,and the catalyst samples were subjected to high-temperature treatment in the laboratory to analyze the resistance to the decomposition of ammonium sulfide salts.The results indicate that the ammonia concentration usually exceeds SO3,and the formation of ammonium sulfate is maximum at 310℃,while a decrease in load will reduce the concentration of SO3 and the amount of ammonium sulfate produced.At 300℃and 250℃,the surface ammonia content of the catalyst was 0.010 4 mg/g and 0.006 33 mg/g,respectively,indicating a decrease of 38.94%in ammonia content with decreasing temperature.In addition,the sulfur content on the catalyst surface decreases linearly with temperature.The reaction time ranges from 2 h to 4 h,and the high-temperature decomposition rate decreases from 36.98%to 28.91%at 250℃.These findings emphasize the importance of controlling the reaction temperature of SCR systems,which has practical significance for optimizing denitrification efficiency and extending catalyst life.
ammonium sulfide saltcoal-fired power plantsflue gas denitrificationGompertz modelquantitative calculation of generation rate
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