Char
Mostrando 13-24 de 64 artigos, teses e dissertações.
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13. ADSORPTION OF MANGANESE FROM ACID MINE DRAINAGE EFFLUENTS USING BONE CHAR: CONTINUOUS FIXED BED COLUMN AND BATCH DESORPTION STUDIES
AbstractIn the present study, continuous fixed bed column runs were carried out in an attempt to evaluate the feasibility of using bone char for the removal of manganese from acid mine drainage (AMD). Tests using a laboratory solution of pure manganese at typical concentration levels were also performed for comparison purposes. The following operating variab
Braz. J. Chem. Eng.. Publicado em: 2015-06
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14. DETERMINATION OF THE KINETIC PARAMETERS OF OXY-FUEL COMBUSTION OF COAL WITH A HIGH ASH CONTENT
Abstract The aim of this study was to determine the kinetic parameters of the oxy-fuel combustion of char from a Brazilian bituminous coal with a high ash content. The char, with a particle diameter of 715 μm, was prepared in a N2 atmosphere at 1173 K. The oxy-fuel combustion assays were performed using a thermobalance at different temperatures and O2/CO2 g
Braz. J. Chem. Eng.. Publicado em: 2015-03
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15. Batch removal of manganese from acid mine drainage using bone char
The present study investigated batch kinetics and the batch equilibrium of manganese removal from acid mine drainage (AMD) using bone char as an adsorbent. Equilibrium tests revealed that the Langmuir-based maximum manganese uptake capacity was 22 mg g-1 for AMD effluents and 20 mg g-1 for laboratory solutions at a pH ranging from 5.5 to 5.7. The pseudo-seco
Braz. J. Chem. Eng.. Publicado em: 2014-03
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16. Simulation of Ablation in a Sounding Rocket Thermal Protection System Via an Interface Tracking Method with Two Moving Fronts
ABSTRACT: In this work, an interface tracking method is employed to simulate the ablative process in the region near the stagnation point of the VSB-30 sounding rocket Thermal Protection System (TPS). The ablation model considers the presence of two-fronts, the char-melting and the pyrolysis fronts. The results for the proposed model are compared to the ones
J. Aerosp. Technol. Manag.. Publicado em: 2013-12
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17. Caracterização da casca de café (coffea arábica, L) in natura, e de seus produtos obtidos pelo processo de pirólise em reator mecanicamente agitado / Coffee husks characterization and its pyrolysis products obtained in a mechanically agitated bed pyrolysis process
O café é um importante produto na balança comercial brasileira e seu processamento gera a casca como um resíduo. O objetivo deste trabalho foi a caracterização física, termoquímica e fluidodinâmica da casca de café (coffea arábica, L) visando sua aplicação em processo de pirólise convencional em reator mecanicamente agitado e posterior caracter
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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18. Simulation of Ablation in a Composite Thermal Protection System via an Interface Tracking Method
Abstract: In this work, the two-dimensional computational simulation of the ablative process in a composite used in rocket thermal protection systems via an interface tracking method was presented. The ablative model considers the presence of two simultaneous moving fronts, the pyrolysis and char fronts. The results were compared with some experimental data,
J. Aerosp. Technol. Manag.. Publicado em: 2012-09
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19. Estudo da pirólise de cana-de-açúcar integral / Study of the pyrolysis of sugar cane integral
Neste trabalho foi feita a caracterização físico-química de três variedades de cana-de-açúcar: a cana tradicional e dois novos tipos de cana para energia, visando avaliar o potencial energético. Ensaios de pirólise foram realizados numa balança termogravimétrica e uma planta de pirólise de capacidade de 20 kg/h de alimentação. Foi realizado um
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2011
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20. IMERSÃO: SENSAÇÃO REDIMENSIONADA PELAS TECNOLOGIAS DIGITAIS NA ARTE CONTEMPORÂNEA / IMMERSION: WIDENED FEELING THROUGH DIGITAL TECHNOLOGY IN CONTEMPORARY ART
Esta dissertação tem como objetivo compreender o redimensionamento que as imagens digitais dão ao campo da arte, sobretudo a sensação de imersão. Acredita-se que a sensação do observador estar na imagem intensifica-se a partir das experimentações artísticas com tecnologias digitais, de modo que é importante discutir este tema no contexto contempo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2011
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21. Caracterização dos produtos da pirólise da casca de castanha de caju : influência da taxa de aquecimento e da temperatura / Characterization of the products from the pyrolysis of the cashew nut shell : influence of heating rate and temperature
O aproveitamento da casca de castanha de caju por meio da conversão térmica pode representar uma solução para o atual problema ambiental de descarte deste resíduo agrícola. Mediante o processo de pirólise, dependendo do tipo de biomassa, a mesma pode ser transformada em liquido, carvão e gases não condensáveis em diferentes proporções. A casca de
Publicado em: 2011
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22. Synthesis of a boron modified phenolic resin
Abstract: Phenolic resin has long been used as matrix for composites mainly because of its flame retardant behavior and high char yield after pyrolysis, which results in a self supporting structure. The addition of ceramic powders, such as SiC and B4C, as fillers to the phenolic resin, results in better thermo-oxidative stability, but as drawbacks, it has po
J. Aerosp. Technol. Manag.. Publicado em: 2010-08
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23. Thermal analysis evaluation of the reactivity of coal mixtures for injection in the blast furnace
Pulverized Coal Injection (PCI) is an important standard technology replacing coke partially by pulverized coal into the blast furnace that allows a significant reduction of hot metal costs and environmental impact, contributing to a decrease of coke requirements for ironmaking. Coals typically used in this process in Brazil are, at current time, exclusively
Publicado em: 2010
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24. Ablative and mechanical properties of quartz phenolic composites
Abstract. Quartz phenolic composites have been applied to thermal protection systems (TPSs) for reentry vehicles since the late fifties due to their excellent ablative resistance and mechanical performance. TPSs must withstand the aggressive reentry environment, such as atomic oxygen, when submitted to very high temperatures (> 1000° C) and heat flux. The a
J. Aerosp. Technol. Manag.. Publicado em: 2009-06