Rotary Kilns
Many kilns, by definition, are refractory lined – using materials which are resistant to decomposition by heat, pressure or chemical attack. The refractory retains its strength and form at high temperatures.

Basically, rotary kilns are rotary shells that are insulated on the inside – which must be done with precise engineering, design and installation of the refractory bricks or other interior lining. Special focus must be placed on the critical relationship between the dryer shell and its rolling components.

a steam dryer being loaded onto a barge

Refractory used in rotary kilns prevent premature shell degradation from heat, pressure and chemical attack.

Refractory-lined kilns are designed to operate 24/7 because the primary factor which shortens their operating life is the thermal changes experienced from ambient temperature ramping up to 1000°F or 2000°F or more. Rotary kilns must be designed and operated carefully to gradually elevate their temperature and then stabilize it at a given rate for its production.

Louisville Dryer Rotary Kilns
Louisville Dryer Company provides both refractory lined Direct-Fired Kilns and Indirect Heat Kilns – often for incineration and gasification of petroleum sludges, biomass, or municipal solid waste. The process material is heated in the rotary unit and in a semi-inert gas stream. The complex organic molecules are converted to synthesis gas. This syngas is withdrawn to a secondary combustion system – ultimately converting waste to energy.

an industrial dryer being transported down the river on a barge

This Louisville Dryer rotary dryer kiln shell was recently custom designed to incinerate industrial process waste and convert it into energy.

For this custom application, the biosolids will be gasified from complex organic compounds into simple hydrocarbons – which will be extracted and then routed back into the burn chamber.

Dimensions and weight of this Rotary Dryer Kiln Shell custom engineered and manufactured by Louisville Dryer craftsmen are approximately:
• 14.5 ft. in diameter x 40 ft. in length
• 9” thick refractory lining
• 50,000 lb. tires (riding rings)
• 250,000 lb. dryer shell + 250,000 lb. refractory = approx. 500,000 lbs. total unit weight.

an industrial dryer being transported down the river on a barge

Once the refractory has been installed (on the inside of this kiln), approximately half a million pounds of steel and brick will rotate to the customer’s specifications with high accuracy and longevity.

To learn how Louisville Dryer applications engineers can custom-design, fabricate and install a long-lasting rotary kiln for your application, contact us today.