Inhibiting scaling in alkaline waste liquor evaporators
    1.
    发明授权
    Inhibiting scaling in alkaline waste liquor evaporators 有权
    抑制碱性废液蒸发器中的结垢

    公开(公告)号:US06235151B1

    公开(公告)日:2001-05-22

    申请号:US09299000

    申请日:1999-04-26

    IPC分类号: D21C714

    CPC分类号: D21C11/106

    摘要: Calcium carbonate scaling is inhibited in a multi-stage alkaline waste liquor evaporation plant in a chemical cellulose pulp mill having a bleaching plant. Calcium-containing effluent from the bleaching plant is treated together with alkaline waste liquor in the evaporation plant. A portion of the alkaline waste liquor of the evaporation plant is supplied to the bleaching effluent to increase the carbonate content of the effluent. Then the bleaching effluent is heated to 110-160° C. by direct contact with a heating medium (e.g. steam, or secondary vapor) and maintained in a retention tank for a period of about 1-20 minutes to reduce the amount of dissolved calcium in the effluent. Finally the heat-treated bleaching effluent is evaporated with the alkaline waste liquor in the evaporation plant, with minimized scaling.

    摘要翻译: 在具有漂白设备的化学纤维素纸浆厂中的多级碱性废液蒸发装置中碳酸钙结垢被抑制。 来自漂白设备的含钙流出物与蒸发设备中的碱性废液一起处理。 蒸发设备的碱性废液的一部分被供应到漂白流出物中以增加流出物的碳酸盐含量。 然后通过与加热介质(例如蒸汽或二次蒸气)直接接触将漂白流出物加热至110-160℃,并将其保持在保留罐中约1-20分钟的时间以减少溶解的钙的量 在流出物中。 最后,热处理的漂白流出物与蒸发设备中的碱性废液蒸发,最小化结垢。

    Falling film evaporator
    2.
    发明授权
    Falling film evaporator 失效
    落膜蒸发器

    公开(公告)号:US5837096A

    公开(公告)日:1998-11-17

    申请号:US530118

    申请日:1996-01-23

    CPC分类号: B01D1/22 F28D9/0006 F28F3/14

    摘要: A falling film evaporator includes a shell with a number of heat transfer elements within the shell. Each heat transfer element has two opposed essentially rectangular plates joined together along upright sides and along seams substantially parallel to the upright sides. The seams form with each other, and the upright sides, a number of vertical flow channels through which steam (heating fluid) flows in the interior of the heat transfer elements to evaporate evaporable liquid flowing downwardly in a film over the outer surfaces of the heat transfer plates.

    摘要翻译: PCT No.PCT / FI95 / 00059 Sec。 371日期1996年1月23日 102(e)日期1996年1月23日PCT提交1995年2月13日PCT公布。 WO95 / 23015 PCT公开 日期1995年8月31日降膜蒸发器包括壳内具有多个传热元件的外壳。 每个传热元件具有两个相对的基本上矩形的板,其沿直立侧和沿着基本平行于直立侧的接缝连接在一起。 接缝彼此形成,并且直立侧面形成有多个垂直流动通道,蒸汽(加热流体)通过该通道在传热元件的内部流动,以蒸发在膜的外表面上向下流动的可蒸发液体 转印板。

    Process for the concentration of spent liquors
    3.
    发明授权
    Process for the concentration of spent liquors 失效
    废液浓缩过程

    公开(公告)号:US5382321A

    公开(公告)日:1995-01-17

    申请号:US868497

    申请日:1992-04-15

    摘要: A process and apparatus provide for the evaporation of spent liquors in several stages, and recovery of volatile substances from spent liquors of organic solvent pulping processes. The recovery system for volatiles is integrated with the evaporation of spent liquors. Heating condensation is carried out in each evaporator effect on several heat surfaces separated from each other. Pure water, vapor condensate, or steam may be injected to the warmer side of an evaporator effect in order to increase the condensing temperature of the vapor. The volatiles are typically alcohols (methanol and/or ethanol) used as the cooking liquor in organic solvent pulping.

    摘要翻译: 一种方法和装置提供了几个阶段的废液的蒸发,以及从有机溶剂制浆方法的废液中回收挥发性物质。 挥发物的回收系统与废液的蒸发相结合。 在每个蒸发器效应中,在彼此分离的几个热表面上进行加热冷凝。 可以将纯净水,蒸汽冷凝物或蒸汽注入到蒸发器效应的较暖的一侧,以增加蒸气的冷凝温度。 挥发物通常是在有机溶剂制浆中用作蒸煮液的醇(甲醇和/或乙醇)。