Taking the 440 t/h circulating fluidized bed(CFB) boiler in Ji-three Power Co.

Ltd.as the research object

experimental study on effect of coal slime mixed ratio on combustion characteristic of boiler was performed.The results showed that

with an increase in coal slime mixed ratio

the bed temperature in dense-phase zone of the boiler decreased.The bed temperature dropped to about 860 ℃ when the mixed combustion proportion was 77%

which made the desulphurization efficiency increased to over 86%.As the proportion of coal slime rising

the boiler efficiency first increased

and then dropped.The boiler efficiency reached the maximum when the coal slime mixed proportion ranged from 50% to 60%.