Utilização De Biomassa De Eucalipto Na Produção De Coque Metalúrgico

Abstract

Resumo A fim de investigar o consumo de biomassas, estudou-se sua participação na mistura base utilizada para a produção de Coque Metalúrgico, substituindo-a em 2% e 5% por madeira e serragem.Foram realizados enfornamentosem duplicata na unidade piloto de coque da Gerdau Ouro Branco com a caracterização de ensaios de reatividade (CRI), resistência após reação com CO 2 (CSR), Drum index (DI) e granulometria do coque produzido. A inserção da madeira mostrou-se mais viável do que a adição do mesmo nível de serragem. Para a participação de 2% de biomassa de madeira,os parâmetros metalúrgicos CSR e CRI apresentaram queda de 2,4pp (pontos percentuais) eaumento de 0,51pp respectivamente, apresentando também uma redução de 2,34pp no DI, 3,55pp no rendimento do coque para alto forno e redução singela de 0,03pp em porcentagem de enxofre.

Analysis of the Influence of Biomass Addition in Coal Mixture for Metallurgical Coke Production

“…Figure 6: Ash behavior with biomass addition (Silva, 2016). This behavior is expected since the ash contents of biomasses tend to be much lower than coals used in coke mixtures.…”

“…In figure 3 is possible to see a research using charcoal with different particle sizes. (Silva, 2016a) The drop in DI can be attributed to the increase in the inert content of the mixture, decreasing its coking power. According to Kubota (2008), the greater participation of aggregates above 1.5mm increases the concentration and propagation of cracks, depreciating the mechanical resistance of the coke.…”

“…In this way, the insertion of biomass improves the coke ash balance, with a direct reflection on the drop in fuel consumption in the blast furnace. For each 1% reduction in ash in coke, 7kg /t hot metal is saved in coke rate practiced in the blast furnace (Silva, 2016). In addition, the low ash content of biomass is interesting for the coking process, since there is a decrease in tar formation.…”

“…According to Sathler (2017), a Brazilian steel company in 2016 had an average coke rate and injection rate of, respectively, 295kg/t of hot metal and 188 kg/t of hot metal. For Silva (2016), it is necessary around 1.2tons of coal to produce 1 ton of coke, therefore, for this situation, the consumption of l coal to produce 1 ton of hot metal is 188kg in PCI Doing a simple stoichiometric calculation, it is possible to say that burning 1 ton of carbon produces 3.3 tons of CO 2 . It is possible to find in the literature several characterizations of coal with an average carbon content of 85%.…”

Caracterização Das Misturas De Carvões E Do Coque Com Adição De Pneu Inservível

“…But, as the present amount of Sulfur is very large there is still more of this element when compared to the BB in addition of 3, 5 and 10% of MT and LT [7]. Increase of Sulfur in coke demands actions to increase the desulphurization at the blast furnace and/or increase in the consumption of desulphurizing agents at the steel plant, so the costs of the production chain must be studied [8]. It can be observed that fluidity increases about 30 ddpm for every 1% of small tire added.…”