The Improvement of Boiler Efficiency on Our Pulverized Coal Fired Boiler

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Other Title
  • クリンカ防止剤添加による微粉炭ボイラの効率改善
  • クリンカ ボウシザイ テンカ ニ ヨル ビフンタン ボイラ ノ コウリツ カイゼン
  • -Introduction of Coal Additive to Control Clinker Generation to the Boiler-
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Abstract

This paper presents the energy saving effect which was gotten by introducing the Fe-based coal additive to prevent Clinker generation to solve troubles on our pulverized boiler.<BR>Nippon Paper Industries installed the new pulverized boiler which called N1boiler and the new steam turbine which called N1turbine in Kushiro mill in 2004, and has begun electric power wholesale business with accumulated know-how to operate pulverized boilers.<BR>After into commercial operation, we had been suffered from the following problems on the N1boiler.<BR>•Huge clinker growth which is over the furnace wall bottom. And peeling off of it had made unexpected halting the boiler operation due to the bottom ash conveyor trip.<BR>•Plugging trouble on the heating element of the Ljungstrom type air preheater caused by ash and sticky acid ammonium sulfate (NH4HSO4) which was produced by ammonia leakage from the NOx removal reactor combined with SOx. And also the acid ammonium sulfate sticks discharge electrodes and collecting electrodes in the electrostatic precipitator that have possibility of making the precipitator trips due to short-circuit.<BR>And we have thought that above problems has made reducing the boiler efficiency due to the insufficient heat exchange in the air preheater and the short supply of the combustion air. So, to solve the problems, we have started inject Fe-based coal additive with Clinker generation prevention effect. As a result, we achieved an enough problem solving and energy saving.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 67 (6), 597-606, 2013

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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