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Valmet Recovery Liquor Analyzer

The recovery of chemicals from spent cooking liquor and the accompanying energy generated from the incineration of organic material are critical operations in kraft pulping. The application of Valmet’s advanced on-line analyzer has made it possible to raise the quality and strength of cooking liquor, react faster to disturbances and increase process through put. Now, in addition to causticizing measurements and optimization solutions, the Valmet Recovery Liquor Analyzer (Valmet Alkali R) provides tools to improve recovery boiler reduction performance with its unique on-line reduction degree measurement.

Achieving the best performance in liquor cycle from recovery boiler to pulp cooking

Features

Using fully automatic real time sampling and standard titration methods, the Valmet Recovery Liquor Analyzer consistently measures the values of Sodium Hydroxide, Sodium Sulfide, Sodium Carbonate and Sodium Sulfate. 

It calculates Reduction Degree, Effective Alkali (EA), Active Alkali (AA), Total Titratable Alkali (TTA), Causticizing Degree (CE%), and Sulfidity (S%) for control of recovery efficiency to provide consistent high quality white liquor for the digester. Harmful over- and under-liming is eliminated and white liquor filters require less frequent cleaning resulting in higher causticizing output, savings in cleaning chemical costs and reduced fresh lime consumption.

No calibration needed

Because the analysis is based on the ABC titration procedure, the most widely used in kraft mill laboratories, no calibration is needed. The entire system is self-cleaning and each sample line is automatically flushed clean after sampling to prevent plugging. The rugged design of the analyzer ensures high uptime with a minimum of regular maintenance.

Benefits

The Valmet Recovery Liquor Analyzer makes it possible to increase pulp production and reduce operation costs. Harmful over- and under-liming is eliminated, and white liquor filters require less frequent cleaning leading to higher recausticizing output, savings in cleaning chemical costs, and reduced fresh lime consumption.

  • Over-liming eliminated
  • Boiling in the slaker prevented
  • Compensates changes in lime quality
  • The debottlenecking tool for slaker, lime kiln and evaporator
  • Decreased standard deviation of green liquor TTA
  • Optimum causticizing degree
  • Lower standard deviation of AA in white liquor
  • Faster recovery from process upset
  • Better heating value of black liquor due to less inorganic dead load
  • Higher recovery line and fiber line throughput

Customer success stories

From smelt to white liquor – the final link

From smelt to white liquor – the final link

A Valmet whole-line measurement system that was instrumental in SCA Obbola’s causticizing plant startup includes a new reduction degree measurement.