Brown Stock Screening
13.6 هزار بار بازدید -
10 سال پیش
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In the kraft chemical pulping process, wood chips are "cooked" in a mixture of alkaline chemicals in large pressure vessels called digesters. Due to irregularities in the wood, and contaminants in the incoming wood, not all of the material coming from the digester is suitable for papermaking. Brown stock screening is that part of the pulping process where oversized and contaminant particles are separated from good papermaking fibers. Pulp exiting a kraft digester is known as brown stock. Unwanted material, or debris, is generally removed in two steps, deknotting and screening.
Learning objectives for this course are:
•The contaminants in unscreened brown stock
•The purpose and theory of knotting and screening
•The major components of a screen/ pressure screen
•The major components of a knotter
•The screening process
•The benefits of a cascaded screening system
•Factors which affect screening performance
•The flows in a screen and knotter
In the kraft chemical pulping process, wood chips are "cooked" in a mixture of alkaline chemicals in large pressure vessels called digesters. Due to irregularities in the wood, and contaminants in the incoming wood, not all of the material coming from the digester is suitable for papermaking. Brown stock screening is that part of the pulping process where oversized and contaminant particles are separated from good papermaking fibers. Pulp exiting a kraft digester is known as brown stock. Unwanted material, or debris, is generally removed in two steps, deknotting and screening.
Learning objectives for this course are:
•The contaminants in unscreened brown stock
•The purpose and theory of knotting and screening
•The major components of a screen/ pressure screen
•The major components of a knotter
•The screening process
•The benefits of a cascaded screening system
•Factors which affect screening performance
•The flows in a screen and knotter
10 سال پیش
در تاریخ 1393/03/14 منتشر شده
است.
13,670
بـار بازدید شده