Study on combustion characteristics of blended coals

Abstract

Power plants in China have to burn blended coal instead of one specific coal for a variety of reasons. So it is of great necessity to investigate the combustion of blended coals. Using a test rig with a capacity of 640 MJ/h with an absolute milling system and flue gas online analysis system, characteristics such as burnout, slag, and pollution of some blended coals were investigated. The ratio of coke and slag as a method of distinguishing coal slagging characteristic was introduced. The results show that the blending of coal has some effect on NO_x but there is no obvious rule. SO_x emission can be reduced by blending low sulfur coal.

Keywords

blended coals, combustion characteristics, slag, emission, NO_x, SO_x