餐饮加盟合同怎么写:CHLORINE DIOXIDE ANALYZER

CHLORINE DIOXIDE ANALYZER

The DURALYZER-NIR Online Analyzer for Chlorine Dioxide Plant

THE CLO2 PLANT CHEMICAL ANALYZER 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.
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

THE TRANSMISSION CELL provides a means for NIR radiation
to interact with the process sample while isolating
the light source, fiber optic cable and spectrometer from the
process. A typical transmission cell is composed of a body
with appropriate sample inlet and outlet connections and a
pair of optical couplers to deliver light to the sample and
collect light after interaction with the sample. The optical
couplers house a set of lenses to focus the radiation onto
the tip of the fiber optic cable. The ends of the couplers in
contact with the process sample have windows, usually sapphire, to provide a transparent optical path for
the entering and exiting light as well as providing isolation from the process sample. Sapphire is usually the
material of choice for the coupler windows due to its combination of hardness, chemical and heat resistance
and transparency over a broad range of wavelengths.


APPLICATION TECHNOLOGY
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.


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