On a 3 MW circulating fluidized bed(CFB)boiler combustion test bench

combustion tests were carried out for Pingshuo 660 MW unit CFB boiler burning the design coal.The self desulfurization characteristics

low NOxcombustion property and effects of adding limestone on desulphurization efficiency were investigated.The results show that

when firing the desing coal

the combustion inside the furnace is stable.The design coal has a certain self-desulphurization effect and the bed temperature is an important factor affecting the self-desulfurization efficiency.The self-desulfurization efficiency of the design coal can achieve31.6%in the temperature range from 750 ℃ to 800 ℃.It was enhanced to 96.5% after limestone was added.The molar ratio of calcium to sulfur and the particle size were related to the desulfurization efficiency

which had a significant influence on combustion efficiency.Under different load conditions

the NOx emission can be kept at a low level.