Equipment for washing and/or dewatering pulp and inserts for preventing rewetting of pulp
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A technology of inserts and equipment, which is applied in the direction of washing/replacing pulp treatment liquid, pulp dehydration, chemical instruments and methods, etc., can solve the problems of complex manufacturing and a large number of welding, etc., to simplify manufacturing, reduce wear, increase stability and strength Effect
Active Publication Date: 2018-01-19
VALMET OY
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On the other hand, this makes manufacturing more complicated as it requires a lot of welding
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[0025] figure 1 Rewetting is shown in relation to a roll press with two cooperating press rolls 102, 104 counter-rotating in directions of rotation R1 and R2, respectively, the pulp 108 being fed in the direction of rotation R1, R2 of the press rolls 102, 104 And up through the nip 106 formed between the press rolls 102,104. Within the nip 106 , a liquid called filtrate is pressed from the pulp into a plurality of filtrate channels 112 , 114 through the permeable cover elements 116 , 118 of each press roll 102 , 104 .
[0026] After the press nip 106 , the pressure of the pulp 108 is reduced and the filtrate 110 that has not yet exited the filtrate channels 112 , 114 returns through the cover elements 116 , 118 , wetting and diluting the pulp 108 . exist figure 1 , rewet is shown by arrows from each filtrate channel 112 , 114 to the rewet region A above the nip 106 . The pulp 108 has a maximum dryness at a first point B before the rewet zone A, while the pulp 108 leaving th...
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Abstract
The invention relates to a device for washing and / or dewatering pulp, said device comprising: two rotatable press rolls (202, 204) with a roll gap (238) between them, each press roll (202, 204) including an axis ( 203,205); a cover element (206,208) having a permeable outer surface and an inner surface; an axial inner barrel (222,224); and a radial wall (226,228,230,232) disposed between the cover element (206,208) and between the axial inner barrels (222,224), thereby forming an axial filtrate channel (210,212) between the cover element (206,208), the axial inner barrel (222,224) and the radial wall (226,228,230,232), the filtrate channel (210,212) are arranged to receive filtrate from the pulp. According to the invention, each press roll (202, 204) is arranged to rotate with the direction of rotation (R1, R2) such that the pulp is arranged to be fed upwardly through the roll nip (238); and at least one filtrate channel (210, 212) is provided with a diameter Inclined wall (241) between facing wall (226, 228, 230, 232) and cover element (206, 208), which inclined wall (241) points in the same direction as the direction of rotation (R1, R2) to prevent liquid from escaping from the filtrate channel (210, 212) Flow to the outer surface of the cover elements (206, 208).
Description
technical field [0001] The invention relates to a rotatable press roll and an apparatus for washing and / or dewatering pulp and an insert for preventing rewetting of pulp in such an apparatus. Background technique [0002] Fiber lines for the production of cellulose-based products include some type of washing equipment to separate the cooking liquor from the pulp. Later in the process, the washing apparatus is also arranged to separate the bleaching liquor after the bleaching step. There are many different types of scrubbers that work on different principles. [0003] Roll presses are often used to wash and / or dewater cellulose-containing pulp when producing cellulose-based products. A roll press comprises two cooperating and counter-rotating press rolls, each having a permeable outer surface, a so-called mantle surface, whereby the outer surface is permeable to the liquid pressed from the pulp. The pulp is deposited on the permeable outer surface and pressed in the nip, o...
Claims
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