A 720Mw coal-fired power plant in Arkansas, US, was experiencing premature failure of their filter bags, which not only posed them emission issues but also financial implications for replacement bags, lost downtime and maintenance costs.
The method of failure was holing between the middle and the bottom of the bag, particularly for those bags in line with the inlet of the dust collector. Aside from lost production, replacing the failed bags was causing significant diversion of scarce labour resources from other valuable tasks.
SOLAFT proposed introducing a shorter StarBag, which represented a significant reduction in filter bag length. The increased surface area of the shorter StarBags enabled the same production rate without compromising particulate capture. The reduction in filter bag length enabled the filter bags to be removed them from the line of the direct inflow, eradicating the premature failure.
The trial was a success and the benefits to the coal-fired power generation plant were:
- Operating DP was reduced 30% while maintaining gas flow
- Pulse pressure was reduced by 50%
- Significantly improved uptime and reduced maintenance costs
- Air-to-cloth ratio remained unchanged