发明名称 |
Sätt och anordning för tvättning av cellulosamassa, gjord av Bagasse och halm, i en uppåtgående ström med motströmmande tvättvätska för bättre återvinning av svartlut |
摘要 |
The pulp is washed using a counter-current technique where the pulp moves upwards and the wash liquor trickles downwards in a vertical tower containing screen elements. The pulp is pushed upwards by a perforated screen plate (2) towards the downward trickle of wash liquor so that the upward movement of pulp and wash liquor displaces black liquor from the pulp by a combination of displacement and diffusion. A method for simultaneously cooling and washing pulp for papermaking which has been produced from a raw material such as straw (from e.g. rice, wheat or oat) or bagasse is carried out immediately after a horizontal screw-type digester and comprises the following steps: (1) washing the cooked material in order to remove black liquor using a counter-current technique where the pulp moves upwards and the wash liquor trickles downwards in a vertical tower containing louver-shaped screen elements; (2) introducing the cooked pulp at a temperature of 130-170[deg]C and consistency of 5-10% to the bottom part of the tower, which contains a conical shape stationary screen (8); and (3) moving a reciprocating circular screen plate with conical holes (3) upwards at a low speed of 50-300 mm/minute, so that the drained pulp is pushed upwards and meets the downward trickle of wash liquor with a lower temperature and progressively cleaner composition, so that this upwa! rd movement of pulp and wash liquor displaces the hot concentrated black liquor from the pulp by a combination of displacement and diffusion. |
申请公布号 |
SE0401399(D0) |
申请公布日期 |
2004.06.01 |
申请号 |
SE20040001399 |
申请日期 |
2004.06.01 |
申请人 |
PUNYA CHAUDHURI;HANS TERELIUS |
发明人 |
PUNYA CHAUDHURI;HANS TERELIUS |
分类号 |
D21C;(IPC1-7):D21C/ |
主分类号 |
D21C |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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