The objective of this paper is to disclose the results of a field test protocol planned and implemented to evaluate the performance behavior of a 1200 kW engine-generator, originally operated with natural gas, converted to liquefied petroleum gas (LPG) from Cusiana oil wells in Colombia. The peculiarity of the liquefied petroleum gas from Cusiana, a byproduct in the drying process of the natural gas, is its high butane content (above 30%). For the assessment of the LPG fuel on the performance of the engine-generator set, it was coupled a resistive load bank, and instrumented for low and high speed data, and emissions. It was designed an experimental procedure that combines starting, steady state, and transient loads. The analysis focuses mainly on the quantitative and qualitative analysis of the quality of the energy generated the fuel consumption, and the developed power. In general, the engine-generator has operated normally with Cusiana LPG fuel in the state of enlistment in which it was tested, maintaining satisfactory thermal regimes. It has delivered power in a stable manner under the conditions of load according to the forecasts of its owners, although much lower than the nominal rated power advertised for natural gas. The acceleration, velocity and displacement vibration values do not exceed the limit values given by the ISO 8528-9. The operation of the engine was safe, and at no point of operation detonation was detected for the loads.
Knowledge of dynamic parameters of mechanical systems is required in different applications, particularly in the simulation and control problems. In this paper, the standard identification methods are discussed and a new methodology for identification of inertial parameters is raised when the closed chain has low mobility. The methodology includes formulating a symbolic model based on the transfer of inertial properties and a reduction using dynamic contribution indices based on CAD approximations. The new method is applied to the front suspension of an electrical vehicle. After applying the procedure, a model with few parameters that allows accurately reproducing the dynamic behaviour of the system is obtained. A novel methodology has been developed that allows the identification of dynamic parameters in low mobility mechanical systems.
En este trabajo, se presentan los resultados del diagnóstico de un grupo motor-generador de 6 cilindros, originalmente diseñado para funcionar con combustible Diésel o con gas natural, cuando se opera alternativamente, por razones de contingencia, con gas licuado de petróleo (GLP) de alto contenido de butano. El protocolo diseñado para las pruebas realizadas en el grupo electrógeno incluye el arranque en frío y el transitorio de calentamiento, así como la obtención de la potencia entregada a plena carga sin riesgo de detonación. Durante las pruebas, se realizaron mediciones de variables ambientales, temperatura del motor, vibraciones, velocidad de rotación, emisiones de escape, potencia activa y reactiva del grupo motor-generador. De acuerdo con los resultados obtenidos, aunque el desempeño del par del grupo motor-generador es bueno cuando opera con GLP, no cumple con las especificaciones requeridas para las unidades de motor-generador de clase G1 en términos de desviaciones de frecuencia y voltaje durante procesos transitorios. A la luz de los límites de emisiones sugeridos por la Agencia de Protección Ambiental (EPA) para las unidades estacionarias, se puede concluir que el conjunto motor-generador sin ajustes y regulaciones apropiados particulares para el GLP, durante la operación, no cumple con los límites de emisión de monóxido de carbono.
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