Sources of Organic Contamination
In a power/steam cogeneration cycle, electricity is produced by steam-driven turbines. Steam is diverted to production processes for heat before it is condensed, circulated back to the boilers, and released in power generation. Leaks in the system are the most common sources of contamination to condensate return.
Surface water sources inevitably contain high levels of organics compared to groundwater. However, efforts to preserve groundwater reservoirs results in surface water sources being used more commonly for make-up water needs. Reclaimed water and municipal wastewater are also being used as high purity makeup water sources for the water/steam cycle.
Along with the contamination sources listed above, organic contamination may come from condenser leaks, pump lubricants, and condensate polishing resin products. Organic cycle chemistry additives are another potential contamination source.
Effects of Organics in Pure Power Plant Waters
- Resins may contaminate makeup and condensate deionizers, leading to more frequent resin cleaning and costly replacement of the same;
- Contaminants may deposit sediments onto heat exchange surfaces, reducing the efficiency significantly;
- Organics break down into acids. The pH of the condensate going into the boiler and turbine is affected, creating corrosion;
- Foam in the boiler makes it more likely that other pollutants will be present in its steam.
The Mettler-Toledo 6000i TOC total organic carbon sensor provides accurate, ongoing measurement in high purity water applications. With a maximum measurement of 2 uS/cm, it refreshes every second to immediately detect the smallest organic contamination. Manufactured with the end-user in mind, the 6000i’s intuitive interface and flexible Plug and Measure design need no reagents or chemicals for use. The unit’s dependable, reliable design uses UV oxidation technology to give you real-time TOC monitoring of your vital water systems.