Cement Kiln / Raw Mill

Cement Kiln/Raw Mill Until 1984, the plant operated two kilns whose exhaust gases were collected by ESPs. Kiln #3, a four-stage preheater calciner rated at 2,200 metric tons per day, was installed to substitute the older kilns. A baghouse was installed; major improvement to the plume (which was evident with the ESP) was expected. Upon installing filter bags, the plume still existed and the regulatory authorities stated something needed to be done.

GORE® Membrane Filter Bag Experience

Collector Designation: Kiln baghouse #3
Collector Manufacturer: Fuller Dracco
Process Description: Cement kiln exhaust
Model Number: 26-BHP 102
Particulate Collected: Kiln dust
Design Airflow Rate: 352,400 acfm
Design Temperature: 482º F
No. Bags/Compartment: 102 design /78 installed
Inlet Grain Loading: 10-300 gr/acf
No. Bags/Collector: 2,652 design /2,028 installed
Particulate Size: 100% less than 325 mesh
Bag Dimensions: 11-7/8" dia. x 30'6" long
Particulate Bulk Density: 30 lbs/cf
Cleaning System: Reverse airflow
Bag Material: GORE-TEX® membrane/acid- resistant fiberglass fabric (16.8 oz/yd2)
Air-to-Cloth Ratio Design: Gross 1.4:1 Net 1.46:1
Date Installed: Kiln #3–March 1992
< STRONG > Actual Air-to-Cloth Ratio:< /STRONG> Gross 1.83:1 Net: 1.91:1

Installed only 78 GORE® membrane filter bags in each compartment, approximately 76% of the total designed number of filter bags. After installation of GORE® membrane filter bags, the plume was still evident; however, the plume was now detached with a bluish appearance. W. L. Gore & Associates, Inc., worked closely with the plant to investigate and recommend modifications to the process which ultimately led to a plume-free stack. The bags are over five years old to-date and are still performing exceptionally well.