Cement applications

Concepts for kiln hoods.

Task
Via the kiln hood, the finished clinker is discharged from the kiln. Simultaneously, the process gases are conducted from the clinker cooler through the hood and into the rotary kiln. In plants with daily clinker outputs up to about 7500 tons, the tertiary air ducts (TAD) are connected mainly to the kiln hood. In larger plants, the TADs are connected behind the kiln hood.
Also the main burner projects into the rotary kiln through the hood. Moreover, the kiln hood provides access to the kiln for maintenance and repair work.

Demands
Apart from the high thermal stresses in the kiln hood, increasing thermochemical stresses due to the growing amounts of alternative (secondary) fuels can be observed.
Therefore, thermochemical resistance has top priority when selecting the most suitable refractory materials for the hood lining. Because of the particularly sensitive behaviour during heat-up, the use of refractory materials that are insensitive to heating up is preferable.
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