Details posts


Generally calciners (in cement books) classify to three types: In - Line calciner, Off-Line calciner & Separate-Line calciner. The definitions of these three types are as the following:

1. In-Line calciner is installed in the kiln exhaust gas flow which means that the combustion takes place in an air/kiln gas mix. This precalciner can be considered an enlarged kiln riser duct.

2. Off-Line calciner is installed off the kiln exhaust gas flow. The combustion takes place in pure (tertiary) air which is also responsible for lifting up the meal.

3. Separate-Line calciner is off-Line calciner with a separate preheater string.

My question is why does FLSmidth classify their calciners to only two types; In-Line and Separate-Line calciner with no Off-Line calciner?

These are not strictly calciner definitions or classifications; they are terms used by different equipment suppliers to determine their product (calciner) design. If we make a comparison between the two classifications as shown in figure-6 and figure-7; the following results can be recognized.

1. FLS In-Line Calciner (ILC) is similar to In-Line Calciner in your definition, the calciner is placed in the riser duct from kiln inlet to bottom stage cyclone and combustion takes place in a mixture of kiln exhaust gas and tertiary air.

2. FLS Separate-Line Downdraft (SLC-D) Calciner is similar to Off-Line Calciner in your definition.

3. FLS Separate-Line calciner (SLC) is similar to Separate-Line Calciner in your definition.

Figure-6: Calciners general classification


Figure-7: Calciners FLSmidth classification


(Source  FLSmidth)