Rechnergestützte exergetische Optimierung verfahrenstechnischer Prozesse

Abstract

Computer-aided exergy optimization of chemical engineering processes. Methods of exergy evaluation as the basis of energy and material analysis of chemical processes have been used for some years to evaluate these processes from the view point of the First and Second Law of Thermodynamics and with regard to their influence on the environment. This paper introduces a tool for computer-aided exergy analysis and optimization of complex process plants. This tool is based on a flowsheeting program that is extended to calculate the exergy of material, heat, and work flows. The optimization problem of process plants is solved in a two level approach by parameter optimization and structural optimization. The parameter optimization is realized automatically by the extended flowsheeting program.The structural optimization is based on heuristic rules and experiences of the process engineer.

Generic and Open-Source Exergy Analysis—Extending the Simulation Framework TESPy

“…A discussion of some of these approaches can be found in [37]. Some tools or routines developed in the past to perform exergy-based analyses are closed-source, no longer available, distributed, or further developed, e.g., routines for Aspen Plus [38][39][40][41][42][43][44], Aspen Hysys [45], ProSimPlus [46], Sim42 [47], or not assigned to a specific software [48,49]. The computer program THESIS [50] was the first simulation tool with an integrated exergy analysis for chemical and energy engineering.…”

“…The turbines of the plant power a generator, whereas pumps and fans require an electrical motor to be powered. Assuming an efficiency for the generator η el,m , its electrical power output of a generator Ẇel,gen is calculated according to Equation (40). The turbine power Ẇ (Equation ( 15)) is multiplied with the efficiency factor η el,m considering mechanical and electrical losses.…”

Application of Advanced Exergetic Analysis for the Improvement of Chemical Processes

“…When considering its application in the design, analysis, and optimization of energy‐intensive chemical processes, it becomes clear that major improvements originate from the information provided by an exergy analysis. Besides its applications in process analysis and evaluation, exergy was used extensively to derive new concepts and to improve the design of chemical reactors , distillation column configurations , , air separation units , , natural gas processes , and complete chemical process designs . In several applications, it has proven to be far superior compared to other thermodynamic methods like pinch analysis , , .…”