Operation Experience of High Efficiency Recovery Boiler（HERB）

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Other Title
  • 高効率回収ボイラー（HERB）の操業経験
  • コウコウリツ カイシュウ ボイラー(HERB)ノ ソウギョウ ケイケン

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Abstract

<p>aio Paper Co. installed New High Efficiency Recovery Boiler at Mishima Mill, and the commercial operation was started from July, 2020. We have been operated this new Recovery Boiler with own know-how of the mill, and generated power has been supplied to power grid with Feed-in Tariff scheme.</p><p>The specialty of this new Recovery Boiler plant is to include new HD concentrator which concentrate heavy black liquor from 78 wt% DS to 85 wt% DS. The capacity of the new Recovery Boiler plant is 1,330 DS T/D without ash. The new HD concentrator is stand-alone evaporation unit which is completely separated from the existing Evaporation Plant. The new recovery boiler includes vertical air system, emulsion type liquor burner, and flue gas cooler etc. And also the composite tube is adopted at lower furnace for measures against corrosion.</p><p>The commercial operation of the power plant with black liquor was started from July 3, 2020. At the beginning of commercial operation, tuning of combustion was not enough. NOx in the flue gas was relatively high, and char-bet formation was not stabilized. But the boiler operation had been tuning to stabilize the boiler combustion to keep the contract power generation to the grid constantly. As the result, operation was stabilized from September 2020.</p><p>The new power plant with RB has been operated commercially for 8 months, and we haves been concentrated to stabilize the operation. Our next targets；further improvement of smelt reduction ratio, increase of steam generation efficiency （boiler generated steam /black liquor dry solid）, lower the water consumption, and 2 years continuous operation without SD etc...</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 75 (6), 510-514, 2021

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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