In a thermal power plant ID Fans running with full load but boiler load is only 80 % give reason ?

1) For example Our Boiler is designed for60% (3000-400 GCV Coal having30-40% Ash) &40 % Dolochar(60-70% Ash). From our Killan we get GCV Dolochar.Now we are feeding70-80% Dolochar &30-20 % Coal.Now air required for fluidation becomes30-40% more than that of our Actual design.As as result.Our ID Fan,PA fan,& FD fan load will increase to130% get100% efficiency of Boiler.Accordingly our all the fans are running in  full Load,but our Boiller is running in UnderLoad.

Now we are running2numbers of  ID Fan,Both PA Fan & Both ID Fan.Each fan is running in60-70 % load

And we are running boiler in Full Load.Our Cost also reduced to50% .