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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Filtros

2018 - 20202

Configurações

Autor: search.filters.author.Konishi, Hirokazu

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
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    Experimental analysis of injecting different blends of biomass materials and charcoal in a blast furnace.
    (2020) Assis, Carlos Frederico Campos de; Leal, Elisângela Martins; Assis, Paulo Santos; Nascimento, Leandro Miranda; Konishi, Hirokazu; Usui, Tateo
    This paper aims to study the possibility of using charcoal, rice husk, sugarcane bagasse, coffee husk, eucalyptus bark and elephant grass and their blends as materials for blast furnace fuel injection. However, any blast furnace fuel must satisfy all the stringent quality requirements such as combustibility, calorific value and ash content. Elaborate processing is also necessary for flowability of the dry pulverized fuel produced from the biomass materials. These properties are evaluated in laboratory by an experimental simulator. The analysis showed the technical feasibility of biomass as an alternative fuel for the blast furnace process, which can contribute as a new energy source. This technique may be one approach to reduce the cost to the steel company by the partial replacement of the fuel materials like coke, and bring further advantages such as the reduction of greenhouse gas generation and obtain carbon credits.
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    Evaluation of carbonisation gas from coal and woody biomass and reduction rate of carbon composite pellets.
    (2018) Usui, Tateo; Konishi, Hirokazu; Ichikawa, Kazuhira; Ono, Hideki; Kawabata, Hirotoshi; Pena, Francisco B.; Souza, Matheus H.; Xavier, Alexandre A.; Assis, Paulo Santos
    Carbon composite iron oxide pellets using semichar or semicharcoal were proposed from the measured results of the carbonisation gas release behaviour. The carbonisation was done under a rising temperature condition until arriving at a maximum carbonisation temperature Tc,max to release some volatile matter (VM). The starting point of reduction of carbon composite pellets using semicharcoal produced at Tc,max = 823 K under the rising temperature condition was observed at the reduction temperature TR = 833 K, only a little higher than Tc,max, which was the aimed phenomenon for semicharcoal composite pellets. As Tc,max increases, the emitted carbonisation gas volume increases, the residual VM decreases, and, as a whole, the total heat value of the carbonisation gas tends to increase monotonically. The effect of the particle size of the semicharcoal on the reduction rate was studied. When TR is higher than Tc,max, the reduction rate increases, as the particle size decreases. When TR is equal to Tc,max, there is no effect. With decreasing Tc,max, the activation energy Ea of semicharcoal decreases. The maximum carbonisation temperature Tc,max may be optimised for reactivity (1/Ea) of semicharcoal and the total carbonisation gas volume or the heat value.