Análisis de costos exergéticos de la turbina de gas aeroderivada GE-LMS100
In this work, the exergy method and the thermoeconomic theory are applied in the analysis of exergy and exergoeconomic costs of the GE-LMS100 GT; with the objective of determining the operating condition where the flow of exergoeconomic costs of the gas turbine is minimum, when it generates a consta...
| Autor: | |
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:t435gd43s |
| Acceso en línea: | https://doi.org/10.24275/uami.t435gd43s |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Thermodynamics info:eu-repo/classification/LEM/Turbinas de gas info:eu-repo/classification/LEM/Gas-turbines info:eu-repo/classification/LEM/Termodinámica info:eu-repo/classification/cti/1 |
| Sumario: | In this work, the exergy method and the thermoeconomic theory are applied in the analysis of exergy and exergoeconomic costs of the GE-LMS100 GT; with the objective of determining the operating condition where the flow of exergoeconomic costs of the gas turbine is minimum, when it generates a constant power of 113.4 MW. The virtue of these methods lies in their usefulness to link the laws of thermodynamics, with the economy and the environment, being valuable tools when diagnosing thermal systems whose purpose is to generate energy products at the lowest environmental and economic cost. The study of the performance of the GE-LMS100 GT in this work begins with the energy parametric study, where the total pressure ratio and the turbine inlet temperature are varied, in order to compare the performance of the aeroderivative gas turbine when operating at design conditions, maximum engine work and maximum thermal efficiency. And it is found that the conditions of maximum engine work and maximum thermal efficiency require increases of 67.078 and 442.146% in the ratio of total pressures, causing only 1.682 and 13.037% increases in engine work and thermal efficiency, respectively. To determine the exergy destruction or irreversibility in the system, an exergy analysis is performed for each equipment or sub-region of the system, and the performance of the GELMS100 GT is determined by means of the exergy and rational efficiencies. It is determined that the rational and exergetic efficiencies are 76.631 and 45.584%, respectively. To complement the energetic and exergetic analysis, a study of the frictional superheat in the compression and expansion processes is carried out, and the superheat heat that is used in the GE-LMS100 GT at different conditions of isentropic compression and expansion efficiencies is analyzed. It is found that the configuration of three sequential and staggered expansion stages gives the TG GE-LMS100 system a superheat factor of 1.019 and the ability to harness 26.39% of the total frictional superheat heat produced in the expansion process. It is found that the decrease in the isentropic compression and expansion efficiencies causes the increase in the produced reheat heat, but also decreases the percentage of reheat heat that can be utilized. To finalize the gas turbine performance study, exergy and exergoeconomic cost analyses are implemented. Three different methodologies are compared: formation, equalization and extraction. And it is evaluated how the variation of the total pressure ratio affects the exergoeconomic costs of the gas turbine when operating at design conditions, maximum engine work and maximum thermal efficiency; finally, it is analyzed how the loss of quality of an operating parameter affects the exergoeconomic costs of the gas turbine when its purpose is to generate a constant power. As a loss of quality of an operating parameter, a 4% decrease in the isentropic compression efficiency of the low pressure compressor is considered; such decrease causes an increase in the obtained exergoeconomic cost flows; due to the increase in the irreversibilities generated in all the equipment that causes a higher requirement of the exergy resources. It is determined that the closest methodologies are the formation and extraction methodologies; since both are based on the productive purpose of the equipment. Unlike the equality method, which is based on the total exergy flows into and out of the equipment. The exergoeconomic product cost flows are 4,275.040, 7,217.187 and 7,177.487 USD/h, for the equality, extraction and formation methods, respectively. The exergoeconomic cost analyses based on rational efficiency are advantageous when seeking to study the total exergy entering and leaving a process, while analyses based on exergy efficiency are more convenient when seeking to determine the exergy that is actually transferred or transformed in a productive process. |
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