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Diagnostic analysis of a PFBC power plant using a thermoeconomic methodology

Abstract:

Thermoeconomic methodologies using either a physical or monetary basis provide a major enhancement for analyzing the synthesis, design and operation of energy systems over that provided with more conventional analyses using only the First and Second Laws of thermodynamics. For example, based on concepts such as technical exergy savings, fuel-product structures, malfunction and impact on fuel consumption, the exergetic cost and perturbation theories which have been developed allow one to make diagnoses of equipment and system performance based on both design and off-design operations. In addition to allocating costs for the product flows of each component of the system, it is possible to determine how the cost of the resources vary when internal system parameters, the unit costs of resources and/or the external demand vary. In this paper, a methodology incorporating the practical aspects of these theories is applied to a Pressurized Fluidized Bed Combustor (PFBC) power plant. A global analysis based on energy, exergy and exergetic cost balances is completed with a more detailed analysis of the steam turbine cycle using the perturbation theory mentioned above.