Developments in pulp and paper manufacture from sugarcane ...

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Cooking & Brownstock Washing Bagasse is typically cooked in a continuous horizontal tube digester. The number of tubes and their diameter depend on the required pulp production. The cooked pulp is sent to the blow tank. In the past, a hot blow was used but more recently cold blow systems have been used as they give better pulp quality. The cold blow is accomplished by introducing black liquor to the cold blow discharge system. From the blow tank, the cooked pulp is pumped to the brownstock washers where it is washed to remove the used cooking liquor and dissolved material. The washer filtrate called black liquor contains dissolved lignin, hemicellulose, and inorganic material from the cooking liquor as well as those dissolved from the bagasse. Silica in the bagasse is dissolved in the black liquor and this important to note due to possible problems related to silica in the chemical recovery system. Several washers – typically 3 or 4 – are arranged in series. Fresh water or filtrate from the oxygen delignification washers if available is used in the last washer to wash the pulp and the filtrate from that washer is used counter-current to wash the pulp in the preceding washer. Filtrate or black liquor from the first washer is sent to chemical recovery. Pulp from the brownstock washers may go to an unbleached pulp storage tower or to oxygen delignification if it is included in the mill. 20
Cooking & Brownstock Washing Continuous Horizontal Tube Digester Continuous horizontal tube digesters are offered by several companies such as GL&V of Canada and Lenzing Technik of Austria. They are also manufactured in China and India. 21
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Page 3 and 4: Bagasse Pulp Mill Units Moist depi
Page 5 and 6: Moist Depithing 5
Page 7 and 8: Type Pro Zell Depither Driving powe
Page 11 and 12: Wet Bulk Storage Bagasse wet bulk
Page 13 and 14: Wet Bulk Storage Artist rendition -
Page 15 and 16: Wet Bulk Storage Boom Stacker - Tam
Page 17 and 18: Wet Depithing/Cleaning Wet depither
Page 19: Bagasse Pulp Mill Units Moist depi
Page 23 and 24: Cooking & Brownstock Washing Browns
Page 25 and 26: Oxygen Delignification Oxygen delig
Page 29 and 30: Screening & Cleaning Screens GL&V H
Page 33 and 34: Bleaching This flowsheet shows an E
Page 35 and 36: Bagasse Paper Mill Units Purchased
Page 37 and 38: Purchased Pulp & Stock Preparation
Page 39 and 40: PM Approach Flow System & Wet End T
Page 41 and 42: PM Approach Flow System & Wet End V
Page 43 and 44: Paper Machine Dry End The paper she
Page 45 and 46: Paper Machine Dry End Press Section
Page 47 and 48: Paper Machine Dry End Size Press Me
Page 49: Paper Machine Dry End Reel Metso Va

Developments in pulp and paper manufacture from sugarcane ...

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