How it works
Separate line calciners are also known as “air-only” calciners, since the calcining chamber is at least partially offset from the kiln riser. Combustion air is drawn through a separate tertiary air duct.
Because kiln combustion gases don’t pass through the calciner, the calciner size can be reduced to attain the required gas velocity and retention time. This often results in a shorter, less costly preheater structure and a shorter erection time for retrofits.
The SLC-D configuration combines the advantages of the well-known separate-line calciners with the low NOx features of the in-line calciner when a portion of the calciner fuel is directed to the kiln riser duct. This effectively destroys thermal NOx formed in the kiln.
All Fuel Types
Because the combustion in the calciner takes place in hot atmospheric air and the combustion temperature in the calciner can be controlled independently of the temperature of the calcined material fed to the kiln, the SLC-D is very well-suited to many fuel types – especially low-volatile fuels.