Analysis and control of a distributed parameter reactor for pyrolysis of wood
Análisis y control de un reactor de parámetros distribuidos en el proceso de pirólisis
A. Morales-Diaz*, A.D. Vazquez-Sandoval1 and S. Carlos-Hernandez2
1 Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Industria Metalúrgica No. 1062 Parque Industrial Ramos Arízpe, Ramos Arízpe, Coah. C.P. 25900, México, Grupo de Robótica y Manufactura Avanzada. *Corresponding author. E-mail: america.morales@cinvestav.edu.mx Tel. +52 (844) 4389600, Fax +52 (844) 4389610.
]]> 2 Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Industria Metalúrgica No. 1062, Parque industrial Ramos Arízpe, Ramos Arízpe, Coah. C.P. 25900, México, Laboratorio de Revaloración de Residuos, Sustentabilidad de los Recursos Naturales y Energía.
Received May 26, 2014
Accepted May 11, 2015
Abstract
This document introduces a methodology for the design of a Proportional Integral + Sliding Mode Control (PI+SM) and its application to a biomass pyrolysis process. The objective of the proposed controller is to promote the transformation of wood into gaseous products, which have high energy value. First, a distributed parameter model of a pyrolysis reactor (from specialized literature) isanalyzed and modified in order to lie implemented in Matlab. After that, a based sliding mode controller is developed considering the reactor temperature as the controlled variable and the applied heat as the control input. Different scenarios are considered and the performance of the designed controller is compared with a classical PI controller and the proces s open loop behavtor via numerical simulation. The results show that the proposed control strategy enhances the gaseous components in the process output.
Key words: pyrolysis, sliding mode control, alternative energy.
Resumen
]]> En este documento se presenta una metodología para el diseño de un control Proporcional Integral + control por Modos deslizantes (PI+SM), así cómo su aplicación en un proceso de pirólisis de biomasa. El objetivo del controlador propuesto es promover la transformación de madera en componentes gaseosos, los cuales cuentan con alto valor energético. En primer lugar se analiza un modelo de parámetros distribuidos planteado en literatura especializada, que corresponde a un reactor de pirólisis; este modelo es modificado e implementado en Matlab. Después, se diseña un controlador basado en modos deslizantes considerando a la temperatura del reactor que se obtiene en cada iteración discreta como la variable controlada y el calor aplicado como entrada de control. Se toman en cuenta diferentes escenarios para evaluar el comportamiento del controlador y para comparar su desempeño via simulación numérica, con la operación en lazo abierto y con un controlador PI clásico. Los resultados muestran que la estrategia propuesta mejora la producción de componentes gaseosos en la salida del proceso.Palabras clave: pirólisis, control de modos deslizantes, energía alternativa.
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