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Language: English French Portuguese
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Kraft Pulping Series (Details)Includes 12 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 19 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French
In a continuous digester, wood chips are surrounded by alkaline liquor and "cooked" at high temperature for a couple of hours. This cooking process digests, or breaks down, the lignin, or glue, which holds the cellulose fibers together. This course provides an overview of a continuous digester cooking system. It describes the general flow of fiber through the mill, the difference between batch and continuous cooking, the variables that are important to the cooking process, and the major pieces of equipment in the cooking process.
Black Liquor Evaporators - Equipment
View Course
Black Liquor Evaporators - Introduction
Continuous Digesters - Hydraulic
Continuous Digesters - Vapor Phase
Recausticizing Fundamentals
The following key questions are answered in this module:
What does "cooking" a wood chip refer to?Cooking wood involves using a combination of high temperature, pressure and alkaline chemicals to dissolve the lignin, the organic compound that hold the fibers together.
What are some of the advantages of continuous over batch cooking?Some of the advantages of continuous cooking include reduced space requirements, improved control, and improved energy efficiency.
How are wood chips transferred into a continuous digester?Chip are transferred to a continuous digester using a special high pressure pocket-type feeder.
How are different process zones established in a continuous digester? Process zones are established by withdrawing liquor through the screened openings in the side of the digester and re-introducing the liquor through a pipe in the center of the vessel.
What are some of the factors which affect the cooking of wood chips?Some of the factors that affect the final pulp include the species, moisture and size of the chips. Within the digester, the strength, and temperature, as well as the time spent within each zone affect the pulp quality.
Below is a transcript of the video sample provided for this module:
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