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:

• High labor and disposal costs

• Unplanned downtime

• 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:

• Same housing, no piping changes

• Increased effective filtration area by 2.5x using our high-dirt-holding capacity depth filter cartridges

• Optimized gradient density structure for longer service life

Results (after 6 months of operation):

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:
By selecting the right high-dirt-holding capacity depth filter cartridges for boiler feed water pretreatment, the power plant achieved:

• 3x longer filter life

• Lower operating pressure drop

• Significantly reduced maintenance and disposal costs

• Improved RO membrane protection