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Language: English French Polish Portuguese Russian
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Training Time: 20 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
"Strong" black liquor enters the recovery boiler containing 65-85% dry solids. The recovery boiler uses strong black liquor as its main fuel and during normal operation functions with black liquor as the only fuel. The cooking chemicals flow out of the recovery boiler as molten salts, or smelt, and are turned into green liquor in the dissolving tank. This green liquor is sent to the recausticizing process for conversion to white liquor. This module describes the components and flow of a recovery boiler liquor system as well as the combustion process of black liquor.
Kraft Recovery Boiler Fundamentals
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Kraft Recovery Boilers - Fireside
Kraft Recovery Boilers - Precipitator
Kraft Recovery Boilers - Sootblowers
Kraft Recovery Boilers - Waterside
The following key questions are answered in this module:
Why does black liquor need to be heated?Concentrated black liquor is quite viscous. Heating the liquor is required so that it can be pumped and sprayed into the boiler.
What happens to black liquor in a recovery boiler?Black liquor is burned in a recovery boiler in order to recover heat and cooking chemicals.
What will happen if a solids level below 60% is detected at the liquor ring header?If low solids is detected in black liquor flowing to the boiler, the liquor is diverted back to the mix tank.
What is mixed with black liquor at the mix tank?Dust and ash from the sootblower hoppers and the electrostatic precipitator, and sometimes make-up saltcake is added to the black liquor in the mix tank.
What can cause variations in the viscosity of black liquor?Some of the conditions that affect the viscosity of black liquor include, solids concentration, wood species, final kappa, and the time and temperature cooking profile.
Below is a transcript of the video sample provided for this module:
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