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Master's Dissertation
DOI
10.11606/D.18.2018.tde-11072018-140732
Document
Author
Full name
Manoel Carlos Diniz Costa
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2000
Supervisor
Committee
Pagliuso, Josmar Davilson (President)
Milioli, Fernando Eduardo
Silveira, Ana Maria da
Title in Portuguese
Efeito da temperatura sobre a conversão e o coeficiente global de taxa de reação na absorção de SO2 por calcário em reator de leito fluidizado
Keywords in Portuguese
Absorção de enxofre
Calcários
Leito fluidizado
Sulfatação
Abstract in Portuguese
Estudou-se o efeito da temperatura na conversão e no coeficiente global de taxa de reação no processo de absorção de SO2 por calcário em reator de leito fluidizado borbulhante atmosférico. O sistema experimental foi constituído por um reator de 160 mm de diâmetro interno e altura de 450 mm e seus periféricos. Os experimentos foram feitos com a introdução de calcário em batelada no leito, fluidizado com ar contendo uma concentração constante e uniforme SO2 e aquecido eletricamente. Utilizou-se granulometria estreita de calcário com diâmetros médios de 545 e 650 μm. A areia de quartzo que compunha o leito tinha diâmetro médio de 650 μm. Os experimentos foram realizados com bateladas de 50 g de calcário adicionadas ao leito durante o teste, com as demais condições mantidas constantes. As temperaturas utilizadas variaram de 700 a 958°C, a relação entre as velocidades de fluidização e de mínima fluidização foi mantida em 4/1, e fator de fluxo bolha/particulado em torno de 2,6. Os resultados mostraram que a conversão foi relativamente baixa, entre 1,2 e 10,9%, dependendo sobretudo da temperatura utilizada. O coeficiente global de taxa de reação aumentou com a temperatura, atingindo um valor máximo de 500 m/s a 881ºC e decrescendo a partir deste valor.
Title in English
not available
Keywords in English
Fluidized bed
Limestones
Sulfation
Sulphur absorption
Abstract in English
The effect of temperature in both the conversion and the overall rate of reaction coefficient for the process of SO2 absorption by limestone within a fluidized bed was studied on a bench scale atmospheric bubbling fluidized bed reactor. The reactor had an internal diameter of 160 mm and was 450 mm high. The bed was fluidized with air with a concentration of about 950 ppm of SO2. This mixture was electrically heated. The bed material was quartz sand with a narrow size distribution of around 650 μm. Limestone was fed to the bed with narrow sized particles of 545 and 650 μm. The experiments were carried out on a batch mode introducing samples of 50 g of limestone into the bed with the other variables kept constant. Process temperatures ranged from 700 to 958°C, the relation between gas fluidization velocity and minimum gas fluidization velocity was fixed at 4/1 and the cross flow factor was around 2.6. The results showed a relatively low conversion of limestone, from 1.2 to 10.9%, depending mostly on temperature. The overall rate of reaction coefficient increased with temperature, reaching a maximum value of 500 m/s at 881°C, and decreasing afterwards.
 
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Publishing Date
2018-07-12
 
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