Sheldon Station has shown the low total cost of ownership of P84 bags

The Sheldon Station consists of two Babcock & Wilcox cyclone boilers burning Powder River Basin coal. Baghouses for each unit were constructed in 1999 and 2000, respectively, replacing ESPs. The bags are built to operate at 310F with a 3.5:1 cfm/ft ² gas-to-cloth ratio. The dust loading is 0.97 grains per actual cubic foot (gr/acf) at the inlet and 0.005 gr/acf at the outlet.

Several alternative media configurations were evaluated during the initial startup of the baghouses. After six months of testing, P84 and P84 scrim were determined to be the most cost-effective configuration based on the plant’s particle size distribution, temperature at the bag, and level of acid products in the exhaust gas. PPS (polyphenylene sulfide) filter bags were among those tested but filter bag life was only 24 months. Since the testing, the P84 bag life has averaged five years for Unit 1 and seven years for Unit 2 over the past 17 years. Over the operating life of the bags, average system pressure drop of 6 inches water column has been maintained with seven cleaning pulses of compressed air per hour.

Sheldon Station reports significant cost savings using P84 filter material in its baghouses over the past 17 years. The cost savings fall into two categories: increased energy sales and decreased replacement bag cost. Reduced pressure drop through the P84 media reduced ancillary loads, principally reducing induced draft fan power by 87,000 MWh, saving $6.1 million. Extended bag life when using P84 media also reduced the cost of replacement bags by $1.5 million.

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