Experimental investigations on co-combustion of shale with Zhundong coal were carried out in a 100 MW unit boiler. From the aspects of fuel characteristics

coal fineness and uniformity

flue gas temperature change

slagging and contamination in furnace

heat loss

boiler thermal efficiency and fuel cost

the operation security and stability of the system was evaluated. The results show that

after blending the shale and greatly increasing the proportion of Zhundong coal

the fuel particle size increased a little and the eveness got worse

the exhaust temperature showed a trend of declining volatility

the slagging and contamination in furnace is not obvious

the combustible content in fly ash sharply reduced

and the boiler thermal efficiency was enhanced by about 1%.