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    • 3. 发明授权
    • Simplified liquid removal system for a cellulose pulp digester
    • 用于纤维素纸浆蒸煮器的简化液体去除系统
    • US6120647A
    • 2000-09-19
    • US13040
    • 1998-01-26
    • C. Bertil StrombergBrian F. Greenwood
    • C. Bertil StrombergBrian F. Greenwood
    • D21C7/00D21C7/14
    • D21C7/14
    • A vertical pulp treatment vessel having a top and bottom, such as a continuous or batch digester, has at least a first substantially annular screen assembly disposed within the vessel between the top and bottom. A first substantially annular header is associated with the first screen assembly and first and second withdrawal conduits extend outwardly from the header and are in fluid communication with it. A barrier, such as a radially extending plate, is disposed in the header between the withdrawal conduits, the withdrawal conduits being adjacent each other (typically spaced from each other between about 2-30.degree., e.g. between about 10-20.degree.). A small, compared to the prior art, platform is provided for allowing access to the withdrawal conduits, and automatically controlled valves or like structures in or associated with the conduits, the platform having an arcuate extent of less than 180.degree., typically less than about 110.degree. (e.g. about 90.degree. or less). Typically, a second annular screen assembly, like the first screen assembly, with third and fourth withdrawal conduits circumferentially spaced from each other between about 2-30.degree., and have a centerline that is circumferentially spaced from the first and second withdrawal conduit centerline less than about 110.degree. (e.g. about 80-110.degree., typically about 90.degree.), so that on the single platform the four withdrawal conduits, and the automatically operated valves associated therewith, may be accessed.
    • 具有顶部和底部(例如连续或间歇式蒸煮器)的立式纸浆处理容器至少具有在顶部和底部之间的容器内设置的至少第一基本上环形的筛网组件。 第一基本上环形的头部与第一筛网组件相关联,并且第一和第二退出导管从集管向外延伸并与其流体连通。 诸如径向延伸的板之间的屏障设置在取出导管之间的集管中,提取导管彼此相邻(通常彼此间隔约2-30°,例如约10-20度)。 与现有技术相比,一个小的平台被提供用于允许进入取出管道,以及在管道中或与管道相关联的自动控制的阀门或类似结构,该平台具有小于180度的弓形程度,通常小于约 110°(例如约90°以下)。 通常,第二环形筛组件,如第一筛网组件,具有在约2-30°之间彼此周向间隔开的第三和第四退回管道,并且具有与第一和第二抽取管道中心线周向间隔开的中心线小于 约110°(例如约80-110°,通常约90°),从而在单个平台上可以访问四个提取导管以及与其相关的自动操作的阀。
    • 8. 发明授权
    • Pretreatment of chips before cooking
    • US06506283B2
    • 2003-01-14
    • US09770408
    • 2001-01-29
    • Kaj O. HenricsonAki Hannu VilpponenHannu Olavi RamarkAuvo Kimmo KettunenC. Bertil Stromberg
    • Kaj O. HenricsonAki Hannu VilpponenHannu Olavi RamarkAuvo Kimmo KettunenC. Bertil Stromberg
    • D21C706
    • D21C1/06
    • The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood chips are soaked in an alkaline liquid at a temperature of about 80-110° C. (preferably 80-100° C., or 90-105° C.) for between one-half-72 hours (typically about 2-4 hours) at a pressure of about 0-15 bar (preferably about 1-5 bar), to dissolve at least about 8% of the wood (preferably about 10-20%) and at least about 15% of the lignin. The alkaline liquid used preferably contains sulfide (e.g. black liquor, green liquor, white liquor, or mixtures thereof), but almost any alkaline liquid having an alkali concentration of about 1.0 mole of NaOH/liter or less (typically about 0.75 m/l or less) is suitable. The wood chips are then raised to a cooking temperature of about 145-180° C. and cooked to produce the cellulose chemical pulp. There may be an intermediate step, between soaking and raising the cooking temperature, of heating the wood chips to a temperature of about 110-150° C. (preferably about 120-140° C.) for about 10-90 minutes (preferably about 10-30 minutes). Alternatively or additionally the majority of the dissolved lignin (and/or other solids) may be removed before raising the wood chips to cooking temperature. The system for treating the wood chips need only include a low pressure soaking vessel (with an associated pump or other transfer device) in addition to conventional equipment.