5-2-3 PM2.5 emission during low rank coal combustion

Abstract

The effect of inherent moisture on combustion behavior of low rank coals was investigated. A drop tube furnace was used to generate chars and fly ashes from both wet and dry coals. The moisture contents of the wet low rank coals entering the reactor were 23.4 and 28.8 wt%, respectively. Rapid vaporization of the inherent moisture in wet low rank coal was considered to cause the structure change of char and the emission of fine included minerals from coal during pyrolysis. A coalescence-fragmentation model has been developed to predict effect of inherent moisture of low rank coals on the emission of PM_<2.5>