Combustibility behavior of PCI coals, green petroleum coke and charcoal fines used as fuel for injection into blast furnace tuyeres.
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2019
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Pulverized coal injection (PCI) into blast furnace tuyeres is widely used by integrated
steel mills worldwide to reduce the consumption of coke and costs. High injection
rates are desirable. The big challenge is to achieve them with cheaper and lower
quality raw materials, without losing the quality of the hot metal and the productivity
of the blast furnace. An increase in the injection rate leads to improved fuel selection.
Thus, it is important to have knowledge of the injected fuel quality variables that affect
the burning efficiency and the replacement rate of the coke into the furnace, as
well as the quality of the hot metal and the stability of the furnace. In this context, the
present study is based on the chemical characterization and combustibility behavior
of four fuels: Australian coal (CMA), North-American coal (CMN), charcoal fines
(MCV) and green petroleum coke (CVP) and fuel blends. Results of chemical analysis
show that the CMA, CMN, MVC and CVP are within the ranges of acceptable
values in the PCI process for the ash and sulfur contents. The order of combustibility
by thermogravimetric analysis was MCV>CMN>CMA>CVP. However, the combustion
rate obtained by the simulator test, performed under extreme conditions of
short residence time and high temperature, presented a different order of combustion
rate of MCV>CVP>CMA>CMN, which may be related to the mineral on char.
The blend that presented the best burning efficiency was obtained for the composition
containing 20%MCV+80%CVP, followed by blends containing 80 and 90% of
CMA, respectively.
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SILVA, K. G.; ASSIS, P. S. Combustibility behavior of PCI coals, green petroleum coke and charcoal fines used as fuel for injection into blast furnace tuyeres. REM - International Engineering Journal, Ouro Preto. v. 72, p. 125-131, jan./ mar. 2019. Disponível em: <http://www.scielo.br/pdf/remi/v72n1/2448-167X-remi-72-01-0125.pdf>. Acesso em: 15 fev. 2019.