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Recaust Applications Recaust Applications
Green Liquor

Green Liquor

Valve scaling can lead to costly process downtime.

Green liquor is a corrosive fluid that leaves scale deposits on the internal components of control valves, causing the valve to bind and resulting in poor flow control, which over time, can prevent the valve from closing. This scale build-up on the valve internals can become so severe that costly process downtime is required to clean the scale out of the valve.

Our solution is designed to address this challenge.

The internal components and flow passage of the Emerson Fisher™ CV500 Rotary Globe Control Valve are designed to reduce scale build-up. The V-notch ball cams go into and out of the seat, minimizing contact with the seat and the binding that can occur from scale build-up. When the V-notch ball cams rotate into the seat scale, build-up on the surface of the ball is removed, enabling positive shut off and reducing costly process downtime.

Caution
Avoid the scaling of equipment
Checklist
Ensure effective process control
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Reduce maintenance costs
Get in touch with an expert, find the nearest ECI location or send us a note about your next project.
Talk to one of our experts
724-746-3700
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Recaust Optimization

Recaust Optimization

Our causticizing control strategy has unique capabilities that provide you with superior value.

Conventional slaker control strategies have been offered to industry in various forms, with limited scope, robustness, and performance.

Our advanced recaust control and optimization strategy maximizes liquor strength while maintaining safe and stable operations.

Real‐time liquor analysis is provided by combining conventional lab tests, Fourier Transform Near Infrared (FT‐NIR) liquor analyzers, and conductivity measurements using an extended Kalman filter (EKF). The solution then uses those continuous measurements to employ a model-based multivariable control strategy with automated dynamic setpoints based on current operating conditions that ensure efficient operation at all times. Optimization of the recausticizing reaction reduces operating costs and improves overall stability throughout the recaust cycle. 

 

Time Chart Trending Upward
Ensure efficient operations
Stacked Line and Column Chart
Improve overall stability throughout recaust cycle
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Reduce operating costs

Proven Results

  • Recaust optimization continuously maximizes white liquor strength
  • Rate of reaction control minimizes the impact of high frequency disturbances to green liquor quality and lime strength on white liquor quality
  • Flexible setpoint options allow operators to control the recaust process based on a target liquor effective alkali (EA) or causticizing efficiency (CE)
  • Slaker and classifier temperature optimization improves lime dissolution and reactivity while ensuring safe and stable operation at all times by preventing boil-over conditions
  • Continuous process unit modeling allows for the highest degree of accuracy in process control and real-time optimization
  • The highly-customizable solution works with a wide variety of liquor analysis instrumentation by including FT-NIR liquor analyzers, lab tests, and real-time conductivity
  • Real-time calculations based on reaction equilibrium, reaction kinetics, and lime supply strength allow for continuous unit insight and optimization under varying operating conditions
Get in touch with an expert, find the nearest ECI location or send us a note about your next project.
Talk to one of our experts
724-746-3700
+
Talk to an expert