Verification of Ammonia Injection Optimization Strategy for SCR Denitrification System of Coal-Fired Boilers
An optimization method of ammonia injection for SCR denitrification system was proposed.The ammonia injection grid was initially adjusted based on the NOx mass distribution at the SCR inlet,and then secondary adjustments were made based on the distribution of NOx mass concentration at the SCR out-let.Based on this optimization and adjustment strategy,the experiments were conducted on a 600 MW coal-fired unit.The results showed that the uniformity of NOx mass concentration distribution on both sides of the SCR outlet under 100％load conditions was significantly improved,with the relative standard devia-tion decreasing from 56.4％and 69.1％to 12.0％and 11.6％;the flow rate of ammonia supply decreased by 28.8％and 26.9％;the average volume ratio of ammonia escape at the SCR outlet decreased from 3.0 pL/L to 1.3 μL/L,and the peak value of ammonia escape decreased from 4.5 μL/L to 1.6 μL/L.The phenomenon of excessive local ammonia spraying was eliminated,and the experimental effect was significant.
SCR denitrificationammonia injectionoptimization and adjustmentdistribution of NOx mass concentrationvolume ratio of ammonia escape
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