In order to study the influence of blending sludge on operation of coal-fired boilers

thermal calculation for a 330 MW coal-fired unit was carried out

on the basis of the energy conservation equation. At the load of 330 MW

280 MW

180 MW and 80 MW

the thermal efficiency

coal consumption

exhaust temperature and spray water flux were analyzed by blending sludge with moisture content of 82%

60%

35% and 10%. The results show that

when the moisture content in the co-fired sludge is kept constant

the influence of sludge blending on the boiler operation increases as the load decreases. When the unit load is kept constant

the effect of sludge blending on the boiler operation increases with the moisture content in sludge. The maximum efficiency reduction is 0.89 percentage point at 80 MW when blending the sludge with moisture content of 82%. The influence of sludge-coal co-combustion on the coal consumption of uncertain

which should be judged and calculated under specific situations.