Controle e monitoramento em tempo real do regime de jorro estavel atraves da analise espectral / Control and monitoring on line of the steady regime in the spouted bed process by spectral analysis

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This work describes the control and on line monitoring of the spouted bed steady regime using the gas-solid contact regimes identification method by pressure measurements. The work presents two main features: 1) the on line identification of fluid dynamic regimes in the spouted bed process based in the spectral analysis of the pressure fluctuations and 2) the process control using PI controllers. Experiments were performed in an acrylic cylindrical column 0.70m high and with 0.143m of internal diameter. The bed was made of three different particles: glass spheres (dp = 2.59mm and Pp = 2.4873 g/cm3), polystyrene (dp = 2.19mm and Pp = 1.1962 g/cm3) and ABS (dp = 3.08mm and p = 1.0286 g/cm3). The dominant frequency band was determined: 7.2-7.9 Hz for steady regime, through the algorithm of the Fast Fourier Transform (FFT), for each particle. All the measurements of pressure during the process were collected by a data acquisition system and using software LabView 7.0TM. The procedure to control the steady regime in the spouted bed process was: define the dominant frequency as the controlled variable and the signal of command for frequency inverter as the manipulated variable. The dominant frequency was determined by the spectral analysis of pressure fluctuations in the spouted bed. The command signal for frequency inverter affected the air flow variable. Step disturbances were applied in open loop in the manipulated variable to determine the parameters of the controller and control system was implemented in the process. Step disturbances like addition of particles in the spouted bed and change the position of opening of the air valve were applied in closed-loop to test the performance of the controller. The results show that PI controller was able to maintain the system operating in steady regime when disturbances were applied in the feed stream, which was the goal of this research

ASSUNTO(S)

controle de processos quimicos analise espectral chemical process control spouted bed processes spectral analysis processo de leito de jorro controller pi

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