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Injection of H2-rich carbonaceous materials into the blast furnace: devolatilization, gasification and combustion characteristics and effect of increased H2–H2O on iron ore pellets reducibility
- Source :
- Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 16029-16037 (2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Increasing the share of hydrogen in reduction of iron oxide in the blast furnace iron making will directly reduce the share of blast furnace greenhouse gas emissions. In the present study, injection of H2-rich biomass and plastic materials was studied in terms of its devolatilization, gasification and combustion characteristics. The released gases were identified using mass spectroscopy attached to a thermogravimetric analyzer and the corresponding kinetics parameters were estimated. The devolatilization was found to occur through two or more steps. The first step is always associated with the release of CO2, CO, H2, H2O and hydrocarbons while only CO and H2 were detected during the later steps. Combustion and gasification starting temperatures of char of H2-rich carbonaceous materials were lower than that of pulverized coal char by ≥ 100 °C. The estimated activation energies suggested that, under the present conditions, devolatilization, gasification and combustion were chemically controlled. Carbon reactivity of the char of the studied H2-rich carbonaceous materials were higher than that of pulverized coal. Moreover, increased H2–H2O content in the blast furnace gas, due to injected H2-rich carbonaceous materials, was found to improve the iron ore pellets reduction kinetics.
- Subjects :
- lcsh:TN1-997
Blast furnace
Materials science
Hydrogen
Iron oxide
chemistry.chemical_element
Injection of biomass
Devolatilization
02 engineering and technology
Combustion
01 natural sciences
Biomaterials
chemistry.chemical_compound
0103 physical sciences
Char
Injection of waste plastic
lcsh:Mining engineering. Metallurgy
010302 applied physics
Pulverized coal-fired boiler
Iron making
Metallurgy
Metals and Alloys
021001 nanoscience & nanotechnology
Pelletizing
Surfaces, Coatings and Films
chemistry
Ceramics and Composites
0210 nano-technology
Gasification
Blast furnace gas
Subjects
Details
- ISSN :
- 22387854
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Research and Technology
- Accession number :
- edsair.doi.dedup.....934efbcd3f0e8ae3b807b8cc2365240a