A Conceptual Efficient Design Of Energy Recovery Systems Using A New Energy-area Key Parameter

Energy integration in petrochemical and refining industries is an effective concept to minimize dependence on heating and cooling utilities through networks of exchanger equipment. Pinch Analysis is very popular and successful technique to optimize heat recovery between heat sources and sinks. Yet, design of networks of exchangers is challenging and requires careful attention to energy consumption and exchanger areas. This work presents a graphical methodology to design exchanger networks taking into account both heat loads and transfer areas of exchanger units in one single information. A new parameter is introduced for design that is the ratio between the heat load and the exchanger area and is determined in kW/m2. It is defined as an energy-area parameter expressing how much heat the exchanger would transfer per every meter square of area. Such parameter will be valuable key in design to screen matches of exchangers providing that both the heat and area are considered. The higher the value of the parameter, the better the performance of the exchanger, i.e. maximum heat transfer rate for minimum exchanger area. The design methodology embedding the energy-area parameter guarantees HEN designs with energy targets and minimum areas. A case is studied for the production of 100,000 t/y of dimethyl ether. An optimum network is generated by applying the new parameter with less exchanger areas and hot utility of 25% and 30%, respectively compared with an automated design by Aspen Energy Analyzer®. Also, substantial savings of about 47% in the total cost of the network are earned

Design Framework for Plant-Wide Energy Analysis Using the Bridge Method

RÉSUMÉ: Les changements majeurs et les modernisations des procédés industriels sont des opportunités importantes pour améliorer l'efficacité énergétique à l'échelle de l'usine, tout en augmentant la rentabilité économique en accédant à de nouveaux marchés grâce à des stratégies de bioraffinage. Ces dernières années, le secteur forestier s'est concentré sur la mise en oeuvre de la cogénération basée sur la biomasse, et cela continuera d'être important à mesure que le réchauffement climatique s'installera. D'autre part, surtout à la lumière de la baisse de la demande de produits dans plusieurs segments importants du secteur forestier et de l'importance des impacts des changements climatiques, l'industrie des pâtes et papiers envisage maintenant de faire la transition vers le bioraffinage forestier : de nombreuses entreprises font les premiers pas en développant des technologies pré-commerciales pour produire de nouveaux bioproduits.----------ABSTRACT: Major changes and modernizations of industrial processes are important opportunities for improving plant-wide energy efficiency, while at the same time increasing economic profitability by tapping into new markets with biorefinery strategies. In recent years, the focus of the forestry sector has been on implementing biomass-based cogeneration, and this will continue to be important as global warming increasingly takes hold. On the other hand, especially in light of the decrease in product demand in several important segments of the forestry sector and increasing importance of climate change, the pulp and paper industry is now considering transformation into forest biorefineries to produce biomass-based products, and many companies are taking the first steps by developing pre-commercial scale technologies to produce new bioproducts