Políticas ótimas de alimentação de substrato e enzima em reator de hidrólise operado em batelada alimentada: uma abordagem de controle ótimo com validação automatizada
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Data
2019-08-29
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Universidade Federal de Goiás
Resumo
The use of fossil fuels contributes to the increase in the amount of free carbon in the atmosphere,
because most of the released carbon does not return to the Earth's surface, boosting the global
temperature increase. Biofuels are a renewable and environmentally safe alternative, inasmuch as
in its production depends that the carbon present in the atmosphere be captured through
photosynthesis forming a cycle of production and consumption of carbon. The use of cellulosic
leavings is a Muito promising alternative for the production of biofuels as 2G ethanol. The main
reason is the fact that these leavings do not enter the competition "food vs fuels " what happens
with 1G ethanol. For the consolidation of the industrial production of 2G bioethanol, the
economic improvement of the process is necessary. For this reason, there are several researches
that seek to make feasible the technique, in this project, a way is presented to improve the feeding
of bioreactors, in order to increase the efficiency of cellulose hydrolysis by releasing reducing
sugars, which could be converted into second generation alcohol. The use of fed-batch reactors
reduces production costs and increases yields, enjoying of rational feed policies of substrates and
biocatalysts. Then, this project intends to determine by means of a computational study, the
optimized feeding profiles of cellulosic substrate and fed batch enzyme. For this, a semi-
mechanistic model is developed, and the optimal control theory for the development of feed
profiles is used. For the application of the feed profiles, a system was designed and built, able to
automate the feed for both bioreactors and reactors, which alBaixo s to operate with different
feeding profiles. The prototype used 3D printing technology to manufacture the mechanical
devices, the entire control is done by two microcontrollers in half duplex network, in charge of
acting on a helical conveyor. Due to the ability to work with nonlinear systems, the fuzzy
nebulous logic was established as the base of the system, being responsible for carrying out the
operations necessary to keep the feeder fully operational.
Descrição
Palavras-chave
Fuzzy , Dosador , Controle ótimo , Biorreator , Hidrólise , Fuzzy , Feeder , Optimal control , Bioreactor , Hydrolysis
Citação
BORGES, A. S. Políticas ótimas de alimentação de substrato e enzima em reator de hidrólise operado em batelada alimentada: uma abordagem de controle ótimo com validação automatizada. 2019. 75 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2019.