Abstract
In this study, we used the thermoeconomic theory to evaluate the impact of residue cost formation on the cost of electricity generated from natural gas burned in a gas turbine that applied sequential combustion; we also analyzed the impact of the combustion process on the additional fuel consumption to compensate for a malfunction component. We used the Alstom GT24 gas turbine, which applied sequential combustion and generated 235 MW of power. Thermoeconomic analysis indicated that the exergy cost of power generation was 626.33 MW (30.42% corresponded to irreversibility costs, and 29.22% and 2.84% corresponded to the formation costs of physical and chemical residues, respectively). The exergoeconomic production cost of gas turbine was 10,098.71 USD/h, 34.76% from external resources and 65.24% from capital and operating costs. Thermoeconomic diagnosis revealed that a compressor deterioration (of 1-% drop in the isentropic efficiency) resulted in an additional fuel consumption of 4.05 MW to compensate for an increase in irreversibilities (1.97 MW) and residues (2.08 MW); the compressor generated the highest cost (49.9% of additional requirement). Thus, our study can identify the origin of anomalies in a gas-turbine system and explain their effects on the rest of the components.
Highlights
The electricity power generation sector plays a key role in supplying the evergrowing worldwide energy demand, at the expense of an increase in the consumption of fossil resources and a negative environmental impact
Motivated by the above-mentioned research, our study presents an exergoeconomic diagnosis, based on symbolic thermoeconomics, of a gas turbine with sequential combustion considering the formation processes of both functional product and residues
This article is an application of thermoeconomic theory to an Alstom GT24 afterburner gas turbine
Summary
The electricity power generation sector plays a key role in supplying the evergrowing worldwide energy demand, at the expense of an increase in the consumption of fossil resources and a negative environmental impact. Valero et al [13,20] developed thermoeconomic methodologies that include the formation processes of both the functional product and the residue in the accounting of the costs of internal flows in a system, along with the costs of the product and residue, and applied the distributed exergy criterion to attribute the cost of the residue to the productive components This contribution has been used to study the production and formation costs of residues from energy systems, with respect to combined cycles [14,18], heating and cooling systems [8], and aviation [19], among others.
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