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News Release from: Lowe Engineering | Subject: Cation exchange
Edited by the Engineeringtalk Editorial
Team on 05 May 2000
Electrochemical cation exchange system
Lowe Engineering, renowned for its steam and hot water analysis systems used in power stations world wide, has introduced the CAT-XL, an electrochemical cation exchange system.
Cation exchange Lowe Engineering, renowned for its steam and hot water analysis systems used in Power Stations world wide, has introduced the CAT-XL, an electrochemical cation exchange system This was developed in association with Eskom which had a need in some of its South African power stations for a method to lengthen the time between resin changes in cation columns
This article was originally published on Engineeringtalk on 7 Mar 2003 at 8.00am (UK)
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These were being changed every three days due to large amounts of ammonia in the lines to combat corrosion in two of their power stations using (High) alkaline volatile water treatment and with up to 150 columns per station.
The prototype showed promise in that the three days between changes was increased b up to 6 months in some cases.
Lowe Engineering in association with Eskom, which has been purchasing Lowe steam and hot water analysis systems for a number of years, then refined and developed the prototype before bring it to market, where there was shown to be a clear and definite interest in the product The CAT-XL is in its simplest form a device using cathode and anode plates supplied with a DC voltage from a bespoke variable output power supply unit.
These plates are sandwiched with a pair of special membranes between labyrinths which have sample power supply connections.
Independent tests carried out have shown typically 90%+ removal of cations, thereby increasing the time between servicing by a factor of 10.
The CAT-XL has been equally successful on morpholine, sodium hydroxide and ammonium hydroxide.
In fact any positive ions will be removed during the process.
Other advantages of the CAT-XL are: * Assured removal of Cations, the cation column remains in line to finally scrub the sample and as a failsafe in the event of a power failure.
* Saving in Labour Costs incurred in servicing the column.
* More reliable plant operation leading to greater efficiency resulting from more accurate analysis and earlier detection of changes and trends.
* Savings on the cost of resins and de-mineralised water.
* Reduced charges for the storage and disposal of regeneration chemicals.
* Reduction in attrition to the columns and associated equipment due to reduced handling.
Field trials with national utilities and units in service are proving the benefits.
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