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Strict environment regulations in chemical and refinery industries lead to minimize resource consumption by designing utility networks within industrial process plants. The present study proposed a superstructure based optimization model for the synthesis of water and hydrogen networks with partitioning regenerators without mixing the regenerated s...
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... There are two approaches in process integration. The first approach is based on the pinch analysis approach [12], [13], [14], [15], [16], [18], [19], [22], [23] and the second is based on the mathematical programming approach [24], [25], [26], [27], [28]. The pinch analysis approach exists in two techniques, graphical targeting technique [12], [15], [16], [18] and numerical targeting technique [13], [14], [19], [22], [23]. ...
This paper addresses the mass load cascade analysis (MLCA) for reuse/recycle and regeneration of hydrogen and water networks as an extension to the mass problem table for targeting the minimum water flowrate in reuse/recycle water network. The MLCA technique gives the pinch concentration and accurate identification of minimum fresh hydrogen and water flowrates required for utility network after source-sink allocation targets. Additionally, selection of hydrogen purification unit was accessed via MLCA. All these targets are determined ahead of detailed design of utility network. Different hydrogen and water network case studies from literature are solved to illustrate the proposed approach.
... There are two approaches in process integration. The first approach is based on the pinch analysis approach [12], [13], [14], [15], [16], [18], [19], [22], [23] and the second is based on the mathematical programming approach [24], [25], [26], [27], [28]. The pinch analysis approach exists in two techniques, graphical targeting technique [12], [15], [16], [18] and numerical targeting technique [13], [14], [19], [22], [23]. ...
This paper addresses the mass load cascade analysis (MLCA) for reuse/recycle and regeneration of hydrogen and water networks as an extension to the mass problem table for targeting the minimum water flowrate in reuse/recycle water network. The MLCA technique gives the pinch concentration and accurate identification of minimum fresh hydrogen and water flowrates required for utility network after source-sink allocation targets. Additionally, selection of hydrogen purification unit was accessed via MLCA. All these targets are determined ahead of detailed design of utility network. Different hydrogen and water network case studies from literature are solved to illustrate the proposed approach. Copy Right, IJAR, 2019, All rights reserved. …………………………………………………………………………………………………….... Introduction:-As a result of restrictive environmental regulations, the world tends to reduce waste and prevent pollution. Process integration is considered as an effective tool for saving the energy and the mass in industry in recent decades. It is used in heat integration to reduce power consumption and maximize heat recovery [1], [2], [3]. In addition, it is used in mass exchange networks [4], [5], [6], [7], [8], [9], water networks [10], [11], [12], [13], [14] and material recycle [15], [16]. In recent years, process integration is used in hydrogen networks to minimize hydrogen supply in refineries [17], [18], [19], [20], [21]. That helps refineries in minimizing the operating cost of fresh hydrogen supply. There are two approaches in process integration. The first approach is based on the pinch analysis approach [12], [13], [14], [15], [16], [18], [19], [22], [23] and the second is based on the mathematical programming approach [24], [25], [26], [27], [28]. The pinch analysis approach exists in two techniques, graphical targeting technique [12], [15], [16], [18] and numerical targeting technique [13], [14], [19], [22], [23]. This paper presents the numerical mass load cascade analysis (MLCA) technique based on pinch analysis approach to obtain the minimum flowrate of fresh source and minimum waste flowrate in hydrogen and water networks. MLCA is an extension of the mass problem table technique [14] to target water networks. The mass problem table technique cannot deal with an impure fresh source of reuse/recycle of water networks. In addition, the new fresh source may have a higher impurity concentration than the process sources, especially in the hydrogen network. In the hydrogen network, the source of fresh hydrogen is rarely pure. Also, the mass problem table technique does not deal with the regeneration process when it is included in the overall water network.
The synthesis of hydrogen distribution networks has been an active area of research over the last two decades. The concept of hydrogen management based on an economic cost-driven analysis appeared late in the 1990s and was followed up by numerous insight-based and mathematical optimisation approaches in the 2000s. More recently, several superstructure-based optimisation methods have been proposed to accommodate pressure restrictions, additional equipment and other practical constraints when finding the optimal flowsheet configuration. This paper provides a state-of-the-art review of different process integration technologies adopted for the assessment of hydrogen resources in refineries and petrochemical plants, published from late in the 1990s to the present time. Both targeting and design methods are reviewed. An effective hydrogen management strategy can only be achieved by combining different insight-based approaches with detailed mathematical programming.
