Effect of briquette composition and size on the quality of the resulting coke

Montiano, M.G.; Díaz-Faes, E.; Barriocanal, C.

doi:10.1016/j.fuproc.2016.02.039

Cited by 49 publications

(30 citation statements)

References 31 publications

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“…The reactivity of the bio-cokes increases when the proportion of charcoal increases. This is in line with the previous research [33][34][35]. The higher reactivity of the bio-cokes is attributed to the ash composition of the raw materials, oxygen content, the inhibition of fluidity development in the carbonized blend, the presence of porous isotropic particles from the biomass, functionality of the biomass material, and the microporosity of the cokes [36].…”

Section: Impact Of Charcoal Particle Size On the Reactivitysupporting

confidence: 90%

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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Abstract:The aim of this research was to investigate the effects of charcoal and Kraft-lignin additions on the structure, cold compression strength, and reactivity of bio-cokes produced at the laboratory scale. Bio-cokes were prepared by adding charcoal and Kraft-lignin (2.5, 5.0, 7.5, and 10.0 wt %) to medium-volatile coal and coking the mixture with controlled heating rate (3.5 • C/min) up to 1200 • C. In addition, four particle sizes of charcoal were added with a 5 wt % addition rate to investigate the effect of particle size on the compression strength and reactivity. Thermogravimetric analysis was used to evaluate the pyrolysis behavior of coal and biomasses. Optical microscopy was used to investigate the interaction of coal and biomass components. It was found that by controlling the amount of charcoal and Kraft-lignin in the coal blend, the compression strength of the bio-cokes remains at an acceptable level compared to the reference coke without biomass addition. The cold compression strength of the charcoal bio-cokes was higher compared to Kraft-lignin bio-cokes. The reactivity of the bio-cokes with charcoal addition was markedly higher compared to reference coke and Kraft-lignin bio-cokes, mainly due to the differences in the physical properties of the parental biomass. By increasing the bulk density of the coal/biomass charge, the cold compression strength of the bio-cokes can be improved substantially.

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Section: Impact Of Charcoal Particle Size On the Reactivitysupporting

confidence: 90%

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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“…25) It is considered that pitch dispersion lowered CRI in this case. This effect appears only in test 4 because CRI in test 4 (over 25) is higher than that in the other tests (15)(16)(17)(18)(19)(20)(21)(22) and CRI is easily to be lowered by pitch dispersion.…”

Section: Effect Of Briquette Size On the Mean Size Of Cokementioning

confidence: 93%

“…In the study of Montiano et al, 16) the weight of the briquette 23 g and 4-6 g corresponds to volume of 20.0-26.3 cm 3 and 4.4-5.7 cm 3 (based on apparent density of 1.149-0.873 g/cm 3 ) and to equivalent sphere volume diameter of 33.7-36.9 mm and 20.3-22.2 mm respectively. In the case of briquette blending ratio of 15%, DI 150 15 for smaller briquette is larger than that for larger briquette, which corresponds to test 1 of this study.…”

Section: -15mentioning

confidence: 99%

“…12) Briquettes from coke breeze and anthracite 13) and brown coal 14,15) were studied from the view point of metallurgical coke production. Montiano et al 16) prepared briquettes using sawdust, a non-coking coal and the binder (coal tar and coaltar sludge) and studied the effect of coal briquette size on coke quality by using a larger briquette (23 g) and a smaller one (4-6 g). They mixed the briquettes with blended coal by 5-15% and showed that the small briquette decreases coke cold strength (DI 150 15 ) less, increases coke reactivity (CRI) more and decreases coke strength after reaction (CSR) more than the large one.…”

Section: Effect Of Coal Briquette Size On Coke Quality and Coal Bulkmentioning

confidence: 99%

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Effect of Coal Briquette Size on Coke Quality and Coal Bulk Density in Coke Oven

Nomura

2019

ISIJ Int.

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Briquette blending carbonization process is one of the effective cokemaking technologies to increase the blending ratio of semi-soft coking coals. The effect of coal briquette size on coke quality and bulk density in coke oven was studied. It was revealed that coke strength DI 150 15 is dependent on the briquette size. DI 150 15 shows a maximum, a minimum or monotonic increase with increasing briquette size, which depends on the blend composition of the briquette and the powder coal. The mean size of coke decreases and coal charge bulk density increases with increasing the briquette size. Choice of suitable briquette size is important from the viewpoint of coke quality, productivity and coke oven operation.

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“…However, as discussed earlier, adding biomass to coal blend leave behind bio-coke with poor mechanical properties compared to conventional coke. Some studies showed that even adding 3% sawdust to the coal blend prior to coking has negatively affected the product mechanical properties [72,74] while other studies stated that up to 5% biomass can be added to the coking coal blend without significant deterioration of the produced coke properties [70,72,75].…”

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confidence: 99%

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Ahmed

2018

Minerals

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The iron and steel industry is still dependent on fossil coking coal. About 70% of the total steel production relies directly on fossil coal and coke inputs. Therefore, steel production contributes by ~7% of the global CO2 emission. The reduction of CO2 emission has been given highest priority by the iron- and steel-making sector due to the commitment of governments to mitigate CO2 emission according to Kyoto protocol. Utilization of auxiliary carbonaceous materials in the blast furnace and other iron-making technologies is one of the most efficient options to reduce the coke consumption and, consequently, the CO2 emission. The present review gives an insight of the trends in the applications of auxiliary carbon-bearing material in iron-making processes. Partial substitution of top charged coke by nut coke, lump charcoal, or carbon composite agglomerates were found to not only decrease the dependency on virgin fossil carbon, but also improve the blast furnace performance and increase the productivity. Partial or complete substitution of pulverized coal by waste plastics or renewable carbon-bearing materials like waste plastics or biomass help in mitigating the CO2 emission due to its high H2 content compared to fossil carbon. Injecting such reactive materials results in improved combustion and reduced coke consumption. Moreover, utilization of integrated steel plant fines and gases becomes necessary to achieve profitability to steel mill operation from both economic and environmental aspects. Recycling of such results in recovering the valuable components and thereby decrease the energy consumption and the need of landfills at the steel plants as well as reduce the consumption of virgin materials and reduce CO2 emission. On the other hand, developed technologies for iron-making rather than blast furnace opens a window and provide a good opportunity to utilize auxiliary carbon-bearing materials that are difficult to utilize in conventional blast furnace iron-making.

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Effect of briquette composition and size on the quality of the resulting coke

Cited by 49 publications

References 31 publications

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Effect of Coal Briquette Size on Coke Quality and Coal Bulk Density in Coke Oven

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

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