English
Industry:
Power Generation (Coal-Fired)
Application:
Boiler Feed Water Pretreatment – Suspended Solids Removal before RO / Ion Exchange
Customer Challenge:
A 600MW coal-fired power plant in East China was experiencing frequent clogging of their existing pleated filter cartridges in the boiler feed water pretreatment system. The filters required replacement every 7–10 days, leading to:
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High labor and disposal costs
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Unplanned downtime
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Increased risk of downstream RO membrane fouling
Raw water source: river water with high seasonal turbidity (up to 35 NTU) and colloidal silica.
Solution Provided by Shanghai Pullner Filtration Technology Co., Ltd.:
We replaced the existing cartridges with our proprietary high-dirt-holding capacity depth filter cartridges (5 µm absolute rating, polypropylene media). Unlike standard pleated filters, our high-dirt-holding capacity depth filter cartridges utilize a gradient density structure that captures particles throughout the entire depth, not just on the surface.
Key modifications:
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Same housing, no piping changes
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Increased effective filtration area by 2.5x using our high-dirt-holding capacity depth filter cartridges
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Optimized gradient density structure for longer service life
Results (after 6 months of operation):
| Parameter | Before | After (with Pullner's high-dirt-holding capacity depth filter cartridges) |
|---|---|---|
| Filter service life | 7–10 days | 28–32 days |
| Pressure drop at change-out | 2.1 bar | 1.8 bar |
| RO membrane cleaning frequency | Every 6 weeks | Every 14 weeks |
| Annual filter consumption | 36–52 sets | 11–13 sets |
Customer Quote:
*“Switching to Shanghai Pullner’s high-dirt-holding capacity depth filter cartridges reduced our annual filter replacement cost by over 60%, and we no longer worry about RO fouling during flood season.”*
— Water Treatment Manager, Power Plant
Conclusion:
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By implementing Pullner’s hhigh-dirt-holding capacity depth filter cartridges in the boiler feed water pretreatment system, the 600MW coal-fired power plant achieved remarkable operational improvements. The solution delivered three times longer filter service life, lower operating pressure drop, and greatly reduced maintenance workload and disposal costs.
More importantly, the stable and efficient pretreatment performance effectively protected downstream RO membranes from fouling, especially during high-turbidity flood seasons. The upgrade not only cut annual operating expenses but also improved the stability and reliability of the entire water treatment system, providing strong support for the safe, continuous and economical operation of the power plant.