Energy integration across multiple water allocation networks with negligible contaminant effects

Abstract

Total site integration is considered for energy conservation opportunities across different individual processes. Heat can be integrated through heat exchangers or through non-isothermal mixing of streams. On the other hand, heat can also be integrated across the processes through direct or indirect integration. A methodology is proposed for heat integration across multiple water allocation networks (WANs), where effect of contaminant can be neglected, incorporating the combination of isothermal or non-isothermal mixing as well as direct or indirect integration. The proposed methodology accounts assisted heat transfer between the pinches for improved site-level heat integration. Energy recovery algorithm is applied for energy integration and determination of process grand composite curve (GCC) for each individual process. The method of site-level GCC is extended and modified for targeting the utility requirement in overall plant of WANs. (C) 2011 Curtin University of Technology and John Wiley & Sons, Ltd.