Kovač Kralj, Anita ; Glavič, Peter ; Krajnc, Majda
Energy integration between several processes has been applied giving more economical and profitable operation. The method for waste heat intgration of several processes has been analysed to reduce ...energy consumption in three steps: 1. retrofit of individual processes, 2. analysis of efficient transfer of waste heat between existing non-retrofitted processes, existing non retrofitted and efficiently retrofitted processes and between efficient retrofits, and 3. simultaneous integration between some non-retrofitted and some retrofitted existing processes using MINLP. The integration between the processes can be carried out by all the steps, or by the first and the third steps, or only by the last step depending on the complexity of the problems. All the steps can be carried out simultaneously and thr MINLP algorithm applied with or without the first and the second step. The approach has been illustrated by four complex processesusing pinch analysis and MINLP. The optimal solution of pinch analysis and MINLP yields the same additional savings of 526 ooo USD per year and selects the same structure and parameters as the MINLP one.
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