Operating Experience by Decanter Centrifuge for Green Liquor Dregs Separation

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  • ドレッグス遠心分離機の操業経験
  • ドレッグス エンシン ブンリキ ノ ソウギョウ ケイケン

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Abstract

<p>Chuetsu pulp & paper Co., Ltd. Takaoka mill has modernized its green liquor treatment system including sedimentation tank and washing system. It has been running since December, 2015.</p><p>A Decanter centrifuge has been adopted for dregs washing aiming to achieve better alkaline recovery, space saving and less running load for operators.</p><p>During commissioning period, it was found that torque on the decanter became too low after starting the machine and dewatering efficiency was low, it took some time to tune up the machine after start up period but now as it is getting steady running, a performance trial especially to tune-up the machine more precisely has been done.</p><p>Following results are obtained:</p><p>1） When increasing torque on the screw, concentration of dregs is increased, at the same time, suspended solid concentration on filtrate is also increased.</p><p>2） In order to stop suspended solid concentration of separation liquid low, the centrifugal force beyond 1,500G is required. Moreover, with the centrifugal force not more than 1,000 G, heavy vibration is caused with poor dewatering.</p><p>3） Suspended solid concentration in the filtrate was getting lower when increasing polymer dosing. However, too much charge of polymer resulted lower the dryness of dregs due to increasing volume of dregs required higher speed on the screw.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 71 (1), 56-60, 2017

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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