Optimal design of cogeneration systems in total site using exergy approach

Abstract

Abstract By increasingly demands on the hot and cold utilities in chemical processing industries, application of unified utility systems has extended in recent decades. Through the Total Site, accessibility to hot steam and condensing water has become more convenience. Therefore, cogeneration systems generate key product of total site, power to electricity network as well as steam to heating purposes. Also, it can be considered to consume the cold utilities to cooling destinations. In present work, defining the multiple arrangements of back pressure steam turbines, an optimal design of heat and power cogeneration systems through exergy point of view is determined. The excellent exergy efficiency and also the least amount of exergy destruction was measured to select the optimum system of arrangements. In times of need for extra power, either a condensing turbine or gas turbine system, were meant to generate deficiency of electricity in network. Then, both the extra scenarios were studied by exergy analysis. Consequently, final optimum system of cogeneration system in total site was selected. This ultimate optimal configuration is consisting the optimal steam turbines as well as the appropriate augmented scenario from exergetic viewpoint, between condensing or gas turbine systems. In addition, two case studies of utility systems were employed to confirm the applicability of proposed methodology.