EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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5 resultados
Resultados da Pesquisa
Item Quality evaluation of metallurgical coke produced with sawdust and different mixtures of coal.(2021) Carvalho, Lays Augusta Leal; Campos, Alex Milton Albergaria; Assis, Paulo SantosThe present research is dedicated to analyzing the addition of sawdust biomass, which is a carbonaceous raw material that may be used in coal blends for the production of metallurgical coke, preserving the required quality, with lower cost. The quality of metallurgical coke may be determined by the efficiency of its chemical, physical and thermal functions inside the blast furnace. For the production of hot metal, any modification in the constituents of the raw materials may have a direct influence on the blast furnace productivity and in the final quality of steel. From the thermal degradation analyzes such as coke reactivity index (CRI) and coke strength reaction (CSR), cold resistance (DI) and immediate analyzes, it may define the quality of metallurgical coke produced with biomass aiming at relating the parameters that interfere in the particularities of the material function in the blast furnace. Some results show that it is possible to use 2% of eucalyptus sawdust in the coal mixture.Item Potencial utilization of the husk from moringa oleifera seed in blast furnace injection.(2018) Campos, Alex Milton Albergaria; Novack, Kátia Monteiro; Assis, Paulo SantosMoringa oleifera is known as the tree of life for its numerous applications in the pharmaceutical, cosmetic and nutritional industries. The husk has some chemistry properties that are interesting to use in the energy generation. However, coal is the most used material for blast furnace injection, which is a non-renewable fossil fuel and emits a huge amount of greenhouse gases. The use of the husk from Moringa oleifera seeds have positive environmental and economic effects as renewable sources of fuel. This study aims at characterizing the husk from Moringa oleifera seed and evaluating its use as a pulverized material injection for the blast furnace. Initial results show that this material has a good combustion rate, high volatiles and hydrogen content. Despite the carbon content and calorific value been lower than coal, it is possible to use 40% of the husks in the injection with the coal mixture, reducing 30% of CO2 emissions in the injection process.Item Study of biomass applied to a cogeneration system : a steelmaking industry case.(2015) Oliveira, Tiago Luís; Assis, Paulo Santos; Leal, Elisângela Martins; Ilídio, Jaderson RodriguesIn this paper, a theoretical technical study was carried out using Brazilian available biomass materials (rice husk, coffee husk and elephant grass) compared to natural gas applied to an electric arc furnace (EAF) steelmaking process. Rice and coffee husk are biomass residues from the agriculture while elephant grass (Pennisetum Purpureum Schum) is an abundant, fast growing plant, which is used for cattle breeding. The ultimate analysis of the biomass materials was carried out in the research department of a Brazilian Steelmaking Industry. The results of the ultimate analysis were used to determine the lower calorific value and the mass flow rate of the biomass materials used in the cogeneration system. The actual steelmaking process uses natural gas to both improve the “cold spots” inside the furnace and contribute to minimize the use of electrical energy in the heating process. The feasibility study considers a combined heat and power plant (CHP) to generate electricity and heat to the electric arc furnace (EAF) process. This study used the First Law of Thermodynamics to determine the operational parameters of the cogeneration plant considering three cases of different operational parameters in the Rankine cycle. The technical results show that the natural gas consumption and exhaust gas generation were the lowest among the fuels in the three cases analyzed. Regarding the exhaust gases generation, some aspects should be highlighted: the combustion of biomass is considered carbon neutral; the exhaust gases generated may be used to scrap preheat; also, biomass is a renewable fuel in contrast with natural gas, which is a fossil fuel. Thus, an economic analysis, considering only the operational cost of the plant, was conducted exhibiting that elephant grass had the lowest operational cost, accounting for a reduction of about 9% in the second case and 15% in the third case compared to natural gas. Although the biomasses have lower LCV than natural gas, they showed a great promise of their use in the EAF process indicating their feasibility as an excellent alternative for the process of producing iron.Item Study of non-conventional fuels for explosives mixes.(2014) Resende, Salatiel Assis; Silva, Valdir Costa e; Lima, Hernani Mota deA utilização do ANFO (ammonium nitrate fuel oil) implica um reduzido custo de desmonte. Tais custos podem ser mais baixos ao se substituir o óleo diesel por combustíveis alternativos como biomassa (biodiesel, palha de arroz, sabugo de milho, bagaço de cana-de-açúcar) e resíduo de pneu. Esse artigo investiga o emprego de novos combustíveis, em substituição ao óleo diesel presente no ANFO via medição da velocidade de detonação e verificação do efeito desses combustíveis na mistura explosiva. Com exceção do biodiesel, todos os ensaios provenientes da mistura entre o nitrato de amônio e os combustíveis alternativos apresentaram desempenho insatisfatório comparado ao ANFO. Os percentuais obtidos de velocidade de detonação das misturas em relação à do ANFO foram de 55,4% (NA + Casca de arroz), 64,9% (NA + Sabugo de milho), 70,1% (NA + bagaço de cana), 74,4% (NA + resíduo de pneu) e 93,7% (NA + Biodiesel). Ainda, a metodologia adotada pode ser aplicada como referência para determinação e elaboração de misturas explosivas (agentes oxidantes e combustíveis), uma vez que, nos ensaios realizados, ocorreu a detonação das cargas.Item Desenvolvimento de explosivos utilizando combustíveis não-convencionais.(Programa de Pós-Graduação em Engenharia Mineral. Departamento de Engenharia de Minas, Escola de Minas, Universidade Federal de Ouro Preto., 2011) Resende, Salatiel Assis; Silva, Valdir Costa eA utilização do ANFO (amonium nitrate fuel oil) implica num reduzido custo de desmonte. Entretanto, tais custos podem ser ainda mais baixos ao se substituir o óleo diesel por combustíveis alternativos como biomassa (biodiesel, palha de arroz, sabugo de milho, bagaço de cana-de-açúcar) e resíduo de pneu. Este artigo investiga o emprego de novos combustíveis, em substituição ao óleo diesel presente na mistura entre o nitrato de amônio e óleo diesel (ANFO) através da medição da velocidade de detonação e, verificar a importância desses combustíveis na mistura explosiva. Com exceção do biodiesel, todos os ensaios provenientes da mistura entre o nitrato de amônio e os combustíveis alternativos apresentaram desempenho insuficiente quando comparado com o resultado do ANFO. Em termos percentuais em relação à velocidade de detonação do ANFO, as misturas apresentaram os seguintes valores: NA + Casca de arroz, 55,4%; NA + Sabugo de milho, 64,9%; NA + bagaço de cana, 70,1%; NA + resíduo de pneu, 74,4% e NA + Biodiesel, 93,7%. Entretanto, este estudo, sugere que a metodologia desenvolvida neste trabalho pode ser aplicada como referência para determinação e elaboração de misturas explosivas entre agentes oxidantes e combustíveis, uma vez que na totalidade dos ensaios realizados ocorreu a detonação das cargas.