New module with high water hardness tolerance expands the Ionpure portfolio
02/11/2011 Siemens Industry Automation & Drive Technologies
Siemens Industry Automation Division has launched the Ionpure VNX CDIT module as an addition to the Ionpure VNX series of modules for continuous electrodeionization (CEDI). Using thin cell technology with a high water hardness tolerance, Ionpure VNX CDIT enables system designers to eliminate costly second-pass reverse osmosis (RO) pretreatment of typical EDI systems. In addition, Ionpure VNX CDIT can also replace aging chemically regenerated mixed bed resin systems that are already operating on single-pass RO. The new module is broadening the application of CEDI in the power generation industry while driving down water treatment and capital costs.By using thin deionization cells, Siemens Industry Automation Division's Ionpure VNX CDIT module has doubled feedwater hardness capability from a previous maximum of 2 ppm as calcium carbonate to 4 ppm. Maximum silica intake has increased to 2 ppm from less than 1 ppm. US Patent Pending thin cell technology also allows for Feedwater Conductivity Equivalent (FCE), an estimation of the ionic load that can be handled by CEDI, more than twice the value of the preceding high hardness module, at up to 100 μS/cm.
This greatly enhanced tolerance gives Ionpure VNX CDIT an eight times higher hardness rating than the common EDI used as a power industry standard. Applications for the new module therefore include boiler feed ultrapurification for power plants with high hardness/high total dissolved solids in the raw water. In addition, VNX CDIT capably replaces Ionpure Legacy H and P series modules.
The components of the new module are housed in the standard VNX vessel format, which is already widely established in power applications, with standard pipe connectivity and skid mounting. However, the internal construction differs from the thick cell design that is common to the rest of the series. This new internal arrangement allows for proven thin cell technology to operate on more challenging feed-water while maintaining the 7 bar operating pressure with guaranteed leak-free performance. Nominal flow is rated at 30 gpm (113 lpm).
The module also ensures that single-pass RO can now be successfully introduced to the typical CEDI pretreatment train in all but the most severe feedwater locations. Elimination of the second- pass RO reduces both the capital costs and the operating costs of the treatment system.
Ionpure is a trademark of Siemens and/or its affiliates in some countries.
Further information about solutions for water treatment is available at: http://www.siemens.com/water
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