* Baghouse now operates at DP 5.5”-6.5” W.C. with reduced cleaning.
* Extended baglife with ePTFE membrane.
* Bag failures are extremely low, thus reducing the maintenance costs and manpower.
 Problem: Approximately 12 months after this plant’s start-up the pressure drop (DP) began to climb and the number of cleaning cycles increased. Eventually, the pressure drop reached 12-13” W.C. with continuous cleaning. The high cleaning frequency led to bag failures. Due to the frequent bag failures, it took two men an average of four (4) man- hours per day on an intermittent basis to keep up with the fabric filter maintenance. As a result, overtime was needed to keep up with the routine maintenance needs of the baghouse. The frequent isolation of the compartments and subsequent cooling created a severe corrosion problem.
Solution: Since the failures were mainly flex-failures along the vertical crease lines, it was decided change the cleaning method. Midwesco converted the baghouse from a shake-deflate to reverse-air/sonic horn. Midwesco installed a new flat tube sheet, added sonic horns, disconnected the shakers, relocated the deflation air duct and installed ePTFE membrane filter bags with rings. Results: After the conversion, the operation of the fabric filters improved dramatically. The baghouse operates at a differential pressure of 5.5”-6.5” W.C. with reduced cleaning cycles. After one year of operation, it was decided to upgrade the other lines in the same manner. It has been estimated that this facility will save $260,000 over the life of the filter bags.
Results: After the conversion, the operation of the fabric filters improved dramatically. The baghouse operates at a differential pressure of 5.5”-6.5” W.C. with reduced cleaning cycles. After one year of operation, it was decided to upgrade the other lines in the same manner. It has been estimated that this facility will save $260,000 over the life of the filter bags. |