Expenditure reduction in the measurement of cationic or acidic conductivity
OPERATING COSTS OF THE REPLACEMENT OF THE VERSUS TRADITIONAL RESIN THE AUTOMATIC REGENERATION OF EDI RESIN (Electro-deionization Device) OF THE AMI CACE ANALYZER.
The online analysis of CACE (conductivity after cation exchange or also acidic or cationic conductivity) is the most necessary parameter to monitor and control the quality of the water-steam cycle of any thermal power plant and process steam in industrial plants.
Typical points of conductivity measurement in water-steam cycles by IAPWS (International Association for the Properties of Water and Steam) include; condensate, feed water, boiler water, steam and replacement water.
The usual practice has been the use of cation exchangers based on resin for the analysis of CACE, which, however, are consumed depending on the water sample, the pH of the sample and the design of the resin column. Therefore, frequent and regular human manipulation is required. This goes against the philosophy of online analytics, which aims to operate in the most autonomous way possible.
Depending on the configuration and layout of the plant, for example in a combined cycle power plant (CTCC) with 2 blocks configured in 2-2-1 (2 gas turbines feeding 2 boilers type HRSG, which supply a turbine of common steam) about a total of 24 CACE analyzers are needed, without considering auxiliary equipment.
Theory and practice
In combined cycles, with AVT (All Volatile Treatment) treatment with a pH of about 9.7 and sample flow rate of 8 liters per hour, the typical 1 liter resin per analyzer is consumed in about 8 weeks. However, this is a theoretical value. The practice shows that for the start-up or change of load of the plants, the impurities in the cycle cause a faster resin consumption, so that 4-6 weeks seems to be a more realistic consumption rate. Nuclear power plants operating at a higher pH have a higher resin consumption and the need for replacement or regeneration is even more frequent.
In the previous example, annual savings of more than $ 37,000 were achieved. The renewal of existing analyzers by a CACE analyzer is quickly amortized.
SWAN AMI CACE
Conductivity before and after cation exchange with an EDI module for automatic and continuous resin regeneration.
Save operating costs and measure more safely to obtain reliable data constantly.
Automatic calculation and visualization of the concentration of the alkalizing agent and the pH (VGB 450L directive).
Continuous monitoring of:
• Specific conductivity
• Acid Conductivity
• pH value or alkalizing agent
No expensive resin columns are required:
No resin exchange.
It does not need maintenance.
Without chemical products.