Field tests of industrial stoker coal-fired boilers for emissions control and efficiency improvement - Site D

Abstract

This report gives results of field measurements made on a 90,000 lb/hr vibrating-grate-stoker boiler. The effect of various parameters on boiler emissions and efficiency was studied. Parameters included overfire air, excess air, boiler load, and fuel properties. Measurements included gaseous emissions, particulate emissions, particle size distribution of the flyash, and combustible content of the ash. Gaseous emissions measured were O/sub 2/, CO/sub 2/, CO, NO, SO/sub 2/, and SO/sub 3/ in the flue gas. Sample locations included the boiler outlet and the multiclone dust collector outlet. In addition to test results and observations, the report describes the facility tested, coals fired, test equipment, and procedures. Increasing the overfire air flow above the minimum required to control opacity resulted in a slight increase in nitric oxide emissions, a slight increase in boiler efficiency, and mixed results with particulate loading. At maximum boiler load, the boiler outlet emissions averaged 1.02 lb/million Btu for particulate loading and 0.275 lb/million Btu for nitric oxide.