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Language: English French
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Training Time: 14 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, French
In a continuous digester, wood chips and liquor are continuously fed to, and withdrawn from, a pressure vessel. Continuous cooking offers some distinct advantages over batch cooking, including reduced space requirements, improved cooking control, and improved energy efficiency. Many variations of continuous digester equipment and process conditions have been used. Some digesters are hydraulically filled, while others utilize a vapor phase. This module covers the basic principles of operation of hydraulically filled continuous digesters.
Batch Cooking Introduction
View Course
Brown Stock Screening
Continuous Cooking Introduction
Continuous Digesters - Vapor Phase
Digester Types
The following key questions are answered in this module:
What are some of the goals of the chip feed system on a continuous digester? In the chip feed system, air is driven from the chips and replaced with water, the chips are partially heated, and they are transferred from a low pressure environment to a high pressure environment.
Why do chips need to be impregnated with liquor before being cooked in a continuous digester? Impregnating chips prior to cooking them helps achieve uniform cooking within the chip and it increases chip density so that they will not float in the liquor of the digester.
What is one way chips are heated in a hydraulic digester? The chips are heated by the liquor which is used to transport chips into the digester.
What is an impregnation vessel? An impregnation vessel is a pressure vessel which precedes a continuous digester. It prepares the chips for cooking by heating the chips and impregnating them with cooking chemicals.
How is chip level usually determined in a hydraulic digester? Chip level is determined by a series of vertically spaced strain gauge type sensors which extend through the shell of the digester and detect movement of the chips in the areas of the digester where there are chips.
Below is a transcript of the video sample provided for this module:
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