Thesis ANÁLISIS TÉCNICO DEL PLAN DE MANTENIMIENTO RECOMENDADO POR EL FABRICANTE A LOS COMPONENTES CRITICOS EXPUESTOS A ALTAS TEMPERATURAS EN LAS TURBINAS A GAS MODELO M701F EN CENTRAL TERMOELÉCTRICA SAN ISIDRO, ENDESA
Date
2018
Authors
TRUJILLO NAHUELPAN, GABRIEL ADOLFO
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Abstract
En este estudio se realiza un aporte a la Ingeniería de planificación del mantenimiento de los componentes expuestos a altas temperaturas de dos turbinas a gas modelo M701F, de la central termoeléctrica de ciclo combinado San Isidro-Endesa, denominadas SI1 y SI2.En un primer lugar se analiza la situación actual de funcionamiento del mantenimiento de las turbinas a gas para así introducirse en el contexto de la planta. Luego se realiza una depuración de la información histórica existente donde se advierte la gran variabilidad de los datos producto de cambios mayores de diseño, principalmente en los componentes de la sección de combustión, y algunos cambios menores de diseño constructivo en algunos componentes, tales como diferencias en el espesor de recubrimiento. Lo anterior produce que se eliminen gran cantidad de datos y se generen datos atípicos. Posteriormente, para concentrar el estudio se realiza un Análisis de Criticidad (AC) a los componentes estudiados, obteniendo 6 con alta criticidad de un total de 17, dentro de los cuales la cámara de combustión alcanza la mayor criticidad en ambas turbinas. Con el conocimiento de los componentes expuestos a alta temperatura críticos se estudian los diferentes modos de fallo que producen inaceptabilidad en las diferentes intervenciones o mantenciones, donde se observa que grietas es el modo de fallo más común dentro de este grupo de componentes. Se intenta determinar las posibles causas de los modos de fallo que producen inaceptabilidad en cada componente de este grupo, donde se concluye que la temperatura de combustión, además de las horas de operación con gas y cantidad de partidas, son las causas más probables de estos modos de fallo.Finalmente, se realiza un análisis estadístico, particularmente un análisis de regresión para obtener las relaciones entre la cantidad de componentes inaceptables y las variables operacionales estudiadas. Es posible obtener baja cantidad de ecuaciones de regresión debido a la baja cantidad de datos en el tamaño muestral final luego de la depuración de la información histórica. Sin embargo, en las relaciones encontradas, se advierte que las principales causas de inaceptabilidad son las horas de operación con gas y cantidad de partidas, corroborando los resultados del análisis de los modos de fallo y sus posibles causas.
In this study, a contribution is made to the Engineering for planning the maintenance of the components exposed to high temperatures of two gas turbines, model M701F, of the San Isidro-Endesa combined cycle thermoelectric power station, known as SI1 and SI2.In the first place, the current operating situation of gas turbine maintenance is analyzed in order to be introduced in the context of the plant. Then, a cleansing of the existing historical information is realized where the great variability of the data product of major design changes is noticed, mainly in the components of the combustion section, and some minor changes of constructive design in some components, such as differences in the coating thickness. The above results in the elimination of a large amount of data and the generation of atypical data. Subsequently, to concentrate the study, a Criticality Analysis (CA) is performed on the components studied, obtaining 6 with high criticality of a total of 17, within which the combustion chamber reaches the highest criticality in both turbines. With the knowledge of the components exposed to critical high temperature, the different modes of failure that produce unacceptability in the different interventions or maintenance are studied, where it is observed that cracking is the most common failure mode within this group of components. We try to determine the possible causes of failure modes that produce unacceptability in each component of this group, where it is concluded that the combustion temperature, in addition to the hours of operation with gas and number of items, are the most likely causes of these failure modes.Finally, a statistical analysis is performed, particularly a regression analysis to obtain the relationships between the quantity of unacceptable components and the operational variables studied. It is possible to obtain a low quantity of regression equations due to the low amount of data in the final sample size after the purging of historical information. However, in the relationships found, it is noted that the main causes of unacceptability are the hours of operation with gas and number of items, corroborating the results of the analysis of failure modes and their possible causes.
In this study, a contribution is made to the Engineering for planning the maintenance of the components exposed to high temperatures of two gas turbines, model M701F, of the San Isidro-Endesa combined cycle thermoelectric power station, known as SI1 and SI2.In the first place, the current operating situation of gas turbine maintenance is analyzed in order to be introduced in the context of the plant. Then, a cleansing of the existing historical information is realized where the great variability of the data product of major design changes is noticed, mainly in the components of the combustion section, and some minor changes of constructive design in some components, such as differences in the coating thickness. The above results in the elimination of a large amount of data and the generation of atypical data. Subsequently, to concentrate the study, a Criticality Analysis (CA) is performed on the components studied, obtaining 6 with high criticality of a total of 17, within which the combustion chamber reaches the highest criticality in both turbines. With the knowledge of the components exposed to critical high temperature, the different modes of failure that produce unacceptability in the different interventions or maintenance are studied, where it is observed that cracking is the most common failure mode within this group of components. We try to determine the possible causes of failure modes that produce unacceptability in each component of this group, where it is concluded that the combustion temperature, in addition to the hours of operation with gas and number of items, are the most likely causes of these failure modes.Finally, a statistical analysis is performed, particularly a regression analysis to obtain the relationships between the quantity of unacceptable components and the operational variables studied. It is possible to obtain a low quantity of regression equations due to the low amount of data in the final sample size after the purging of historical information. However, in the relationships found, it is noted that the main causes of unacceptability are the hours of operation with gas and number of items, corroborating the results of the analysis of failure modes and their possible causes.
Description
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Keywords
CENTRAL TERMOELECTRICA SAN ISIDRO, ENDESA , PLAN DE MANTENIMIENTO , TURBINA A GAS