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    METHOD FOR GENERATION OF CLEAN STEAM IN A CONTINOUS DIGESTER SYSTEM
    3.
    发明申请
    METHOD FOR GENERATION OF CLEAN STEAM IN A CONTINOUS DIGESTER SYSTEM 审中-公开

    公开(公告)号：US20190218712A1

    公开(公告)日：2019-07-18

    申请号：US16301602

    申请日：2017-05-16

    Applicant: VALMET AB

    Inventor： Krister OLSSON ,  Jari MIETTINEN ,  Keyla MIETTINEN ,  Kjell LJUNGKVIST

    IPC: D21C1/02 ,  D21C11/06 ,  D21C3/24 ,  D21C7/10

    Abstract: The invention relates to an improved method for generating clean steam in a digester plant of a chemical pulp mill. By feeding a steam-to-steam converter (SSC) with venting steam from a black liquor flash tank (FT) as well as venting steam from chip steaming (SV) could the volume of clean steam produced be increased by over 40-50%, and to such an extent that the volume of clean steam covers the needs for preheating of chips in the digester system also in severe operational conditions. The total consumption of clean steam from the steam net of the mill may be reduced and used for other purposes such as electricity production, which meets the requirements for converting the pulp mill to an environmental friendly pulp mill.

    Method of digesting lignocellulosic material
    5.
    发明授权
    Method of digesting lignocellulosic material 有权

    公开(公告)号：US09803317B2

    公开(公告)日：2017-10-31

    申请号：US14377610

    申请日：2013-02-08

    Applicant: BASF SE

    Inventor： David Durocher ,  Thomas C. Friel ,  Kenneth L. Zack

    IPC: D21C5/00 ,  C08H8/00 ,  D21C3/02 ,  D21C3/22 ,  D21C3/24

    CPC classification number: D21C5/00 ,  C08H8/00 ,  D21C3/02 ,  D21C3/222 ,  D21C3/24

    Abstract: A method of digesting lignocellulosic material includes the steps of providing the lignocellulosic material and a caustic composition having a pH of at least about 10. The caustic composition includes water, an alkaline- or alkaline earth-metal hydroxide, and up to about 1 percent by weight based on a total weight of the composition of a branched digestion additive. The branched digestion additive has the structure: wherein A is at least one alkyleneoxy group and each alkyleneoxy group has from 2 to 4 carbon atoms, n is 0 or 1, B is a branched aliphatic hydrocarbon group having from 8 to 15 carbon atoms, X is H or B-0-(A)m, and each m is independently an average value from 3 to 30, and wherein the caustic composition has a Draves Wetting Time of less than 100 seconds as determined using ASTM D2281.

    METHOD AND APPARATUS FOR PUMPING SAWDUST FEED IN A SAWDUST PULPING SYSTEM
    6.
    发明申请
    METHOD AND APPARATUS FOR PUMPING SAWDUST FEED IN A SAWDUST PULPING SYSTEM 审中-公开

    公开(公告)号：US20170175328A1

    公开(公告)日：2017-06-22

    申请号：US15387597

    申请日：2016-12-21

    Applicant: Andritz Inc.

    Inventor： Tyson Bradford HUNT

    IPC: D21C7/06 ,  D21C3/24 ,  D21C3/02 ,  D21C7/00

    CPC classification number: D21C7/06 ,  D21C3/02 ,  D21C3/24 ,  D21C7/00

    Abstract: A method of producing chemical cellulose pulp from sawdust utilizing a static down-flow retention vessel comprising the steps of continuously pressurizing a flow of sawdust using a progressive cavity pump to produce a pressurized sawdust feed for a treatment vessel, passing the pressurized sawdust feed at super-atmospheric pressure downwardly in the treatment vessel, adding treatment white black liquor to the treatment vessel, and treating the pressurized sawdust feed in the treatment vessel with treatment white black liquor to form a treated sawdust, and discharging treated sawdust from the treatment vessel.

    Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method
    8.
    发明授权
    Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method 有权
    采用化学增强洗涤法的双层釜反应器系统及木屑水解消解方法

    公开(公告)号：US09194080B2

    公开(公告)日：2015-11-24

    申请号：US14278579

    申请日：2014-05-15

    Applicant: Andritz Inc.

    Inventor： Namhee Shin ,  Bertil Stromberg ,  Ventzislav H. Kirov ,  William J. Cann

    IPC: D21C7/00 ,  D21C7/06 ,  D21C3/26 ,  D21C1/02 ,  D21C3/24 ,  D21C3/02 ,  D21C1/04 ,  D21C7/14

    CPC classification number: D21C3/26 ,  D21C1/02 ,  D21C1/04 ,  D21C3/02 ,  D21C3/24 ,  D21C7/00 ,  D21C7/06 ,  D21C7/14

    Abstract: A reactor vessel system including: a first reactor vessel having a hydrolysate and liquid extraction screen, a first region above the extraction screen that is maintained at conditions promoting a hydrolysis reaction in the cellulosic material, a second region below the extraction screen in which the hydrolysis is substantially suppressed and a wash liquid inlet below the extraction screen providing wash liquid at a temperature below a hydrolysis temperature; a transport pipe having an inlet coupled to the first reactor vessel and an outlet coupled to a second reactor vessel, and the second reactor vessel includes a liquid discharge that extracts a portion of liquid from the second reactor vessel and directs the portion of liquid to the first reactor vessel or to the transport pipe.

    Abstract translation: 一种反应器容器系统，包括：具有水解液和液体提取筛的第一反应器容器，在提取筛网上方的第一区域，其保持在促进纤维素材料中的水解反应的条件下，提取筛网下面的第二区域，其中水解 基本上被抑制，并且在提取筛下方的洗涤液入口在低于水解温度的温度下提供洗涤液; 输送管，其具有连接到第一反应器容器的入口和连接到第二反应器容器的出口，并且第二反应器容器包括液体排出物，其从第二反应器容器中提取一部分液体并将液体部分引导到 第一反应堆容器或运输管道。

    Cooking process of lignocellulose material
    9.
    发明授权
    Cooking process of lignocellulose material 有权
    木质纤维素材料的烹饪过程

    公开(公告)号：US09145642B2

    公开(公告)日：2015-09-29

    申请号：US13322729

    申请日：2010-05-18

    Applicant: Kazuhiro Kurosu ,  Keigo Watanabe ,  Takamichi Kishi

    Inventor： Kazuhiro Kurosu ,  Keigo Watanabe ,  Takamichi Kishi

    IPC: D21C3/02 ,  D21C3/24

    CPC classification number: D21C3/022 ,  D21C3/02 ,  D21C3/24

    Abstract: A continuous cooking process making use of a digester, which includes therein, from a top toward a bottom of the digester, a top zone, an upper cooking zone, a lower cooking zone and a cooking/washing zone and also includes strainers provided at the bottom of the respective zones and wherein a cooking black liquor extracted from at least one of the strainers is discharged to outside a digestion system, a process for cooking a lignocellulose characterized by feeding, upstream of the top of the digester, a first cooking liquor containing an alkaline cooking liquor having a specified composition, feeding a second cooking liquor of an alkaline cooking liquor made mainly of sodium hydroxide to the upper cooking zone, and feeding a third cooking liquor of an alkaline cooking liquor similar to the second cooking liquor to the cooking/washing zone.

    Abstract translation: 使用包括其中的消化器从蒸煮器的顶部到底部的蒸煮器的连续烹饪​​过程，顶部区域，上部烹饪区域，下部烹饪区域和烹饪/洗涤区域，并且还包括设置在蒸煮器 底部，并且其中从至少一个过滤器提取的烹饪黑液排出到消化系统的外部，用于烹饪木质纤维素的方法，其特征在于，在蒸煮器顶部的上游供给含有 将具有特定组成的碱性蒸煮液，将主要由氢氧化钠制成的碱性蒸煮液的第二蒸煮液供给到上部烹饪区域，并将与第二烹饪液类似的碱性蒸煮液的第三蒸煮液送入烹饪 /洗涤区。

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