Steam Stabilization and Energy Conservation for a Coal Boiler by Using a Model-Driven PID Controller

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  • モデル駆動型ＰＩＤ制御によるボイラ主蒸気安定化と省エネルギー
  • モデル クドウガタ PID セイギョ ニ ヨル ボイラ シュジョウキ アンテイカ ト ショウエネルギー

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Description

The movements of energy conservation in Japan are promoting based on the Kyoto Protocol concerning the reduction of greenhouse gases at COP 3 held in Kyoto in 1997. According to the energy conservation, the industrial world is making various efforts for the conservation of energy. The amount of use of cheap coal for boilers of factories is increasing especially in spite of recent rising of the energy cost.<BR>Comparing to gas boilers and oil boilers, coal boilers have long dead time from the boiler master command to main steam pressure due to long fuel transportation time and long fuel burning time. Due to the long dead time, the large control gain is not able to set, as a result the main steam pressure and the main steam temperature are fluctuating in the large band.<BR>If the fluctuation bands could be reduced, and if there is some margin at temperature limit, the boiler efficiency can be improved by setting higher value of the set point of the main steam temperature control loop.<BR>We have already obtained some excellent results by applying the model drive PID control (MD-PID) for long dead time processes.<BR>In this paper, after showing the Yatsushiro plant, coal boiler issues and properties of the MD-PID control system, we show the result for a coal boiler of 440 t⁄hr level of the main steam flow rate.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 61 (6), 666-673, 2007

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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