Cement Kiln

The plant currently has a four-stage suspension preheater kiln with an in-line raw mill. The system has an alkali bypass system designed for a 10% bypass. From the kiln, exhaust gases are collected by two baghouses, A-side and B-side. A-side has 16 compartments, each with 290 filter bags (5" diameter by 16.5' long)---> total bags = 4,640 with a design airflow of 154,000 acfm. B-side has 16 compartments, each with 140 filter bags (8" diameter by 26' long)---> total bags = 2,240 with a design airflow of 183,000 acfm. On the B-side with conventional filter bags, the differential pressure was 14" w.g.

GORE® Membrane Filter Bag Experience

Collector Designation: Kiln baghouse 317B
Collector Manufacturer: Fuller Dracco
Process Description: Cement kiln exhaust
Model Number: R/A-2240
Particulate Collected: Kiln dust
Design Airflow Rate: 183,000 acfm
Design Temperature: 300º F
No. Bags/Compartment: 140
Inlet Grain Loading: 10-300 gr/acf
No. Bags/Collector: 2,240
Particulate Size: 30 microns mmd
Bag Dimensions: 8" dia. x 25' long
Particulate Bulk Density: 60-80 lbs/cf
Cleaning System: Reverse airflow
Bag Material: GORE-TEX® membrane/acid resistant fiberglass fabric (10 oz/yd2)
Air-to-Cloth Ratio Design: Gross 1.56:1 Net 1.66:1
Sealing Mechanism: Flat snap band fitting over thimble
Date Installed: B side–April 1996

Since installation, the baghouse has operated above the design airflow with a consistent differential pressure of 4" w.g. The emissions have been tested at 0.0025 gr/acf which, at design airflow, equates to under 4 lbs/hr.