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URI permanente para esta coleçãohttps://rigalileo.itegam.org.br/handle/123456789/174
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Item ANÁLISE E IDENTIFICAÇÃO DO MODELO DINÂMICO DO PROCESSO DE COMBUSTÃO EM UM CALCINADOR INDUSTRIAL(Instituto de Tecnologia, 2015) COSTA, Daniella dos Santos Ferreira; SILVA, Orlando FonsecaThis work was developed at Hydro Alunorte's alumina refinery in Barcarena — PA, specifically in the calcination area. Calcination is the process by which all the free water or combined hydrate (Al₂O₃·3H₂O) is eliminated, forming aluminum oxide or simply alumina (Al₂O₃). This reaction requires heating in the combustion chamber with controlled temperature around 1000ºC, located within the stationary fluidized bed calciners. Inside the furnace, a combustion reaction takes place with HFO (Heavy Fuel Oil) as fuel and atmospheric air, which is captured via blowers. The main objective of this work is to identify a representative mathematical model for the combustion process that happens inside the furnace, to further optimize it, thus increasing the energy efficiency of the calciner oven.Item Melhoria na Arquitetura do Sistema de Controle de Combustão de uma Caldeira Modelo DZ-SD na Refinaria da Hydro Alunorte(Instituto de Tecnologia, 2015) SOUSA JUNIOR, Juvenal Farias de; COSTA JUNIOR, Carlos Tavares daThis work presents a proposal to modify the furnace pressure control system in the DZ boiler at Hydro Alunorte refinery, aiming to solve instability problems during load variations. The implementation of the feedforward control strategy resulted in greater operational stability, increased boiler response speed, and the restoration of automatic operation of the combustion system and oxygen control. The results showed significant improvements in boiler performance and the reliability of the steam generation system.