|
Case Studies Renneburg Case Study
A calcium products producer - started looking for a new dryer due to increase capacity needs and the calcining of his limestone in a direct fired counter flow rotary unit. After review of several different dryer options, the producer decided to install a fluid bed system to eliminate the calcinating problem, increase capacity and achieve a better overall operating efficiency.
A secondary benefit of the fluid bed system was discovered during pilot testing when the dryer product was analyzed. The fluidizing air stream was classifying the material being fed to the dryer. The customer had a second market for a particular fine size material of minus 60 mesh.
The heavy oil fired fluid bed dryer used a longer retention time than the rotary unit. Combining the longer retention time with the increased efficiency available with a fluid bed resulted in a dried product being produced at a lower temperature avoiding the calcination of the product. The top of the fluid bed dryer, known as the freeboard area, was expanded to allow for the system to air classify based on exhaust gas flow through the dryer and the 60 mesh particle size separation required.
The most important advantage gained by the conversion to the fluid bed system was the higher product quality resulting from the elimination of the calcinated limestone. The lower operating and maintenance costs were also very important in the decision to use a fluid bed for this application. The added benefit of classifying the fine material reduced the load on the grinding circuit, reducing costs.
Heyl & Patterson Inc.
2000 Cliff Mine Rd
Park West Two Suite 300
Pittsburgh, PA. 15275
Phone - 412 788-9810
Fax - 412 788-9822
24hr emergency HOTLINE - 412 788-9811
E-mail - info@heylpatterson.com
| 
