A. Low reactivity of carbonised residue containing high proportion of iron & sulphur
B. Low forced draft & fuel bed temperature
C. Thick firebed and preheated primary air
D. All A., B. and C.
A. < 2
B. < 5
C. < 8
D. < 10
A. Fans
B. Arrangement of heating stock in the furnaces
C. Location of outlet ports and heating & combustion devices
D. All A., B. and C.
A. Thermal efficiency of the process
B. Sources of heat losses
C. Scope of reduction of heat losses
D. All A., B. and C.
A. Premix
B. Outside mixing type
C. Rotary
D. Diffusion
A. Preheating the combustion air
B. Oxygen enrichment of combustion air
C. Preheating the fuel gas
D. All A., B. & C.
A. Walking beam reheating furnace
B. Reverberatory furnace
C. Tower furnace
D. Tunnel kiln
A. Transportation of coal
B. Drying of coal
C. Combustion of coal by supplying it around the burner
D. Preheating the primary air
A. Hood annealing furnace
B. Muffle furnace
C. Both A. and B.
D. Neither A. nor B.
A. Higher calorific value
B. Better combustion
C. Smokeless burning
D. Less erosion on furnace wall