Conmark Systems Inc.
Continuous Performance Improvements for the Pulp & Paper Industry        

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Chlorine Dioxide Analyzer

The ClO2 Plant Chemical Analyzer Solution: This solution provides a reliable and accurate analysis of the critical chemicals in the R-10 (Solvay) process, with measurements every 5-10 minutes.

In this particular process the overall Chemical Reaction formula is:

6NaClO3 + CH3OH + 6H2SO4 = 6ClO2 + CO2 + 6 NaHSO4 + 5H2O

In a typical manual control scheme the ClO2 Production rate is controlled by the amount of Methanol feed to the Generator. By using look-up tables the Chlorate and Sulphuric Acid feeds are adjusted by the plant operator. As the Chlorate and Acid concentration vary, among any other process variables, the Generator outlet chemical composition is tested in the lab, typically every 2 hours.

The goal is to maintain Chlorate concentration Molarity at 1-4 and Acid concentration at 7-10-Normal. Based on the lab results the make-up chemical feeds are adjusted accordingly. However, this very slow sampling frequency and the required production rate changes result in poor efficiency and chemical losses, especially the expensive Chlorate. The final control function is the water addition to the ClO2 Absorption Tower in order to maintain a constant, desired ClO2 concentration
.

Continuous  Digester Analyzer

The unique design of this system and materials used have proven themselves in several other difficult Kraft Pulping and Recovery applications to be practically maintenance free, physically small and portable with easy installation and low installed cost.

Manufacturer: R.E. Hodges; Auburn, Alabama

Chlorine Dioxide Analyzer Application:

Reliable and accurate chemical analysis of the ClO2 generation process is important for optimizing the efficiency and chemical consumption. Due to the complexity of this process, the Chlorate and Sulphuric Acid levels in the Generator need to be constantly monitored, after which an automatic control algorithm can then be fairly easily implemented.

 Even a small improvement in reducing the variations inside the Generator will result in a rapid payback of the DURALYZER-NIR System.

The final control function will be the accurate concentration control of the ClO2 to the desired target. Again, with frequent measurements this variation can be reduced resulting in more uniform Brightness control at your Bleach Plant.