Performance assessment with Pinch technology and integrated heat pumps for vaporized concentration processing

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• 作者：Chi-I Tuan^a ; ^{cituan@jellice.com.tw} ; Yi-Lung Yeh^b ; ^{yalung@mail.npust.edu.tw} ; Chi-Jen Chen^c ; ^{chencj@mail.tajen.edu.tw} ; Ting-Chien Chen^a ; ^{chen5637@mail.npust.edu.tw}
• 关键词：Pinch technology ; Heat pump ; Mechanical vapor re-compression ; Multiple-effect vacuum evaporators
• 刊名：Journal of the Taiwan Institute of Chemical Engineers
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：43
• 期：2
• 页码：226-234
• 全文大小：1075 K

文摘

The enhancement of energy use efficiency is an urgent issue. In this study, Pinch technology (PT) was used to assess the optimum energy use in a process. A heat pump (HP) was combined with a three-effect vacuum evaporator (TEVE) in an old and traditional food factory to recover and reuse waste heat. The Base case evaluated just the TEVE system. Three other cases included using the TEVE with: PT assessment alone (Case-1), PT with a conventional HP (CHP) (Case-2) and PT with a mechanical vapor recompression technology called advanced HP (AHP) (Case-3). Case-2 and Case-3 not only enhanced the energy use efficiency and reduced energy consumption, but also decreased waste heat emissions, which lowered the environmental heating load. When the PT was combined with the AHP (Case-3), the results were unsurpassed. The heat of demand and emission were reduced by 15.7 (2.15 ¡Á 10⁶ kWh/y) and 22.6 % (3.10 ¡Á 10⁶ kWh/y), respectively compared to the Base case. The results imply that if industry in Taiwan used this system to promote energy use efficiency, the potential energy savings would be equal to 1.9 months of heat energy by burning fuel oil. In addition, the reduced heat discharge potential was 2.44 ¡Á 10⁷ kWh/y, which could also reduce the environmental heating load.