Avaliação da aplicação de modelos para a secagem de pastas e suspensões em leito de jorro com alimentação contínua
This work studies the development, implementation and improvement of a macroscopic model to describe the behavior of the spouted bed dryer with continuous feeding for pastes and suspensions drying. This model is based on the CST model (Freire et al., 2009) and the model of Fernandes (2005), whose th...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15843 |
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| Resumo: | This work studies the development, implementation and improvement of a
macroscopic model to describe the behavior of the spouted bed dryer with continuous feeding
for pastes and suspensions drying. This model is based on the CST model (Freire et al., 2009)
and the model of Fernandes (2005), whose theoretical foundation is based on macroscopic
mass and heat balances for the three phases involved in the process: gas, liquid and solid.
Because this technique is quite relevant, the studies of modeling and simulation of spouted
bed drying are essential in the analysis of the process as a whole, because through them it is
possible to predict and understand the behavior of the process, which contributes significantly
to more efficient project and operation. The development and understanding of the
phenomena involved in the drying process can be obtained by comparing the experimental
data with those from computer simulations. Such knowledge is critical for choosing properly
the process conditions in order to obtain a good drying efficiency. Over the past few years,
researches and development of works in the field of pastes and suspensions drying in spouted
bed has been gaining ground in Brazil. The Particulate Systems Laboratory at Universidade
Federal do Rio Grande do Norte, has been developing several researches and generating a
huge collection of experimental data concerning the drying of fruit pulps, vegetables pastes,
goat milk and suspensions of agro-industrial residues. From this collection, some data of goat
milk and residue from acerola (Malpighia glabra L.) drying were collected. For the first time,
these data were used for the development and validation of a model that can describe the
behavior of spouted bed dryer. Thus, it was possible to model the dryer and to evaluate the
influence of process variables (paste feeding, temperature and flow rate of the drying air) in
the drying dynamics. We also performed water evaporation experiments in order to
understand and to study the behavior of the dryer wall temperature and the evaporation rate.
All these analysis will contribute to future works involving the implementation of control
strategies in the pastes and suspensions drying. The results obtained in transient analysis were
compared with experimental data indicating that this model well represents the process |
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