Most of the burners of the rotary kiln pass through the kiln head cover, extend into the kiln head cylinder, and heat the material to the required temperature through flame and radiation. Burners have various forms such as coal injection pipes, oil spray guns, gas nozzles, etc., depending on the type of combustion. When the reaction temperature is low, a combustion chamber is set beside the kiln head cover to pass hot flue gas into the kiln to supply heat.
