Experimental study and Theoretical analysis on the influence for diverse boiler load to SCR denitrification system

This study investigates the performance of SCR catalysts which has been analyzed with a theo- retical method from the operation data on the SCR device of a 600MW unit, and then performance experi- ments have been done under the high load-600MWt Compared to the results through theoretical analysis, the denitri- fication efficiency measured at field test on the 320MW is relatively lower than that under 600MW when NH3/NO ratio stays constant, the reason of which mainly lies in the obvious change of flue gas flow field at SCR inlet, distributing in an opposite trend to that under 600MW. Improvement and optimization of rectify- ing device at denitrification inlet flue is recommended to realize uniform flow field, thus in addition to the improvement of NOX distribution uniformity at denitrification outlet and reduction of ammonia escaping rate, the denitrification efficiency is increased, hopefully providing guidance on the economical operation of SCR denitrification system . KEYWORD: load; SCR; relative standard deviation of υk; non-uniform flow field; denitration efficiency