Evaluation of Low-Temperature Drying System by Thermal Exergy

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  • Tanaka Hiroyuki
    東京工業大学化学生命科学研究所プロセス工学部門

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  • 熱エクセルギーからの低温乾燥システムの評価
  • ネツ エクセルギー カラ ノ テイオン カンソウ システム ノ ヒョウカ

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Abstract

<p>The role of drying to supply the fuel for biomass power system has become more and more important because the drying contributes to saving thermal exergy. The purpose of my work is to show why low-temperature drying contributes to saving thermal exergy and discuss which source of heat is suitable for low-temperature drying.</p><p>For the purpose, first I showed the procedure to calculate thermal exergy. Using the procedure I unveiled the significance of low-temperature drying by comparing the case of combusting materials directly without drying (the temperature is assumed to be 800˚C) with the case of combusting those after drying using different sources of heat.</p><p>Second, I evaluated the sources of heat for low-temperature drying.</p><p>As a result, for low-temperature drying, heating with a heat pump and with a wasted heat discharged from a cogeneration system especially performed better than heating with an electric heater using exergy calculation. Utilizing heats from a heat pump and a cogeneration system was better than combusting materials in a boiler directly without drying.</p><p>In conclusion, by comparing the exergy consumption using different sources of heats, the superiority of the utilization of a heat pump and a cogeneration system was verified.</p>

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