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Powdered resins and filters cartridges

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The key advantages of a precoat condensate filtration system, are evident when Customers want to save money compared to a full flow traditional condensate treatment using a dual stage System: prefiltration stage and bead ion exchange resins stage. Recent experiences in Combined Cycle gas Turbines or in Air Cooled Condensers equipped power plants has shown that a good water chemistry is needed and that the condensate needs to be properly filtered before any further treatment can be carried out. Filtering a condensate containing 100 ppb of iron is cost-effective and in the mean time, feed the boiler with such a high level of oxides is not acceptable.

That’s why water chemistry plays such an important role in reducing ionic or suspended pollutants. To help this process, the following important rules need to be applied: in ACC equipped plants, ferrous material added with 1,5% Cr are the most indicated. In CCGT cycles, use titanium or stainless steel condenser to guarantee 0 ionic pollutant inleakages.

In this situation, a precoat filter coated with an appropriate mixture of powdered ion exchange resin can be used as condensate treatment and can operate at higher temperatures. The same system can be followed by a bead ion exchange system or, cation and anion separated beads to be used when the temperature allows it or when ionic inleakage suggests it.
A precoat system is a very logical and appropriate condensate treatment due to the different possible applications.

Powdered resins and filters cartridges

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During start up: wounded polypropylene catridges and cellulose fibers precoat produce a deep condensate filtration and absolute of mixed beads protection. During normal operation: wounded polypropylene cartridges coated with appropriate powdered resin mixture followed by partially bypassed bead ion exchange system could be used, to achieve the requested condensate conductivity. This configuration allows chemicals reduction, perfect oxides retention and good feed water conductivity values.

During normal operation: (oxide values less than 10 ppb) replace the wound cartridges with pleated cartridges (same number, same size) and operate filters with no precoat.

During transient mixed beds unavailability, the pleated cartridges can be coated with powdered ion exchange resin H/OH form. In this way a low capacity mixed bed can be reproduced.

In normal operations, pleated cartridges can operate for more than 5 years when iron level is below 10 ppb. If properly operated, wounded coated cartridges can last up to 10 years in similar conditions.