Effects of operating conditions on deNO(x) system efficiency in supercritical circulating fluidized bed boiler

The purpose of this work was to determine the impact of a operating conditions on the deNO(x) system efficiency. in a 966 MWth supercritical circulating fluidized bed boiler. Experimental tests were carried out on a full-scale DeNO(x) system installed in the world's largest once through supercritical circulating fluidized bed boiler. In this work, the effects of the following parameters were studied: flue gas temperature inside the separators between 636 degrees C and 845 degrees C, relative ammonia mass flow over the range 0.22-1.00 and three relative values of O-2 concentration (i.e. 0.94, 1.0 and 1.13). The efficiency of deNOx system increases (ca. 53%) with increasing relative ammonia mass flow. A maximum DeNOx system efficiency ( ca. 70%) was achieved at flue gas temperature in the range from 720 degrees C to 790 degrees C. In the case of all unit loads, deNOx system efficiency from 36% to 70% was observed and performs a standard emissions relate to permissible concentration of NOx in the flue gas.