Application Practice of Composite Full Load Denitration Technology in Supercritical Boiler
In order to achieve the standard emission of NOx from coal-fired boilers throughout the entire period and based on the current wide load denitrification technology,a full load denitrification retrofit scheme for cold startup of 650 MW supercritical unit called"Economizer feedwater bypass+Steam source conversion of 2HP"was proposed.Results showed that,the outlet feedwater temperature of #2 high-pressure heater was increased by more than 10 ℃ during medium speed warm-up.The flue gas temperature was raised to meet the operating conditions of the denitrification system during the initial ignition stage,and the mean value of NOx in the clean flue gas can achieve the ultra-low emission limits before the unit is connected to the grid.Before grid connection,significantly reduce the heat absorption of feedwater can maintain the inlet flue gas temperature of SCR reactor at 300 ℃ or above after the denitrification system was put into operation.Applied to deep peak shaving of supercritical units,automatic adjustment of the entire process can be completed within a load range of 15％to 100％.
supercritical boilerfull load denitrificationeconomizer feedwater bypasssteam source conversion of 2HP
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维普
