Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

Matsumura, Takeshi; Ichida, Morimasa; Nagasaka, Tetsuya; Kato, Kenji

doi:10.2355/isijinternational.48.572

Cited by 74 publications

(60 citation statements)

References 12 publications

(17 reference statements)

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“…This is explained by the fact that the particle size distribution is finer in SP (20 wt.% vs. 4 wt.% of < 0.5 mm). The surface area of contact in SP is also greater, increasing the possibility of fissure and crack formation at the interface between the sawdust and the coal with a consequent decrease in mechanical strength [34]. In addition the density of the briquettes prepared with SP is lower than that of the briquettes prepared with SC.…”

Section: Modification Of Coke Quality Due To Briquette Additionmentioning

confidence: 90%

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

Montiano

Díaz-Faes

Barriocanal

2016

Fuel Processing Technology

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Five briquettes were prepared using sawdust, a non-coking coal and a binder.Industrial coal blends were used to study the influence of the type of sawdust (pine and chestnut), the binder (coal tar and coal-tar sludge) and the size of the briquettes on the quality of the cokes produced from mixtures containing up to 15 wt.% of the five briquettes. The effect of the briquettes and briquette components on the fluidity of the industrial coal blends was investigated. It was found that biomass and non-coking coal produced a decrease in fluidity, whereas the binders increased it. The combined effect of both types of additive had the global effect of decreasing fluidity. Mixtures of the briquettes with the industrial coal blends were carbonized in a 17 kg movable wall oven in order to assess their influence on the quality of the cokes produced. Their cold mechanical strength (JIS DI150/15 index), reactivity to CO 2 (CRI index) and postreaction strength (CSR index) were also tested. The composition of the ash of the sawdusts and the reactivity of the briquette components were used as an indication of the effect on coke reactivity. The effects on cold mechanical strength and post-reaction strength were different in some cases.

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Section: Modification Of Coke Quality Due To Briquette Additionmentioning

confidence: 90%

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

Montiano

Díaz-Faes

Barriocanal

2016

Fuel Processing Technology

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“…Effect of charcoal injection on large blast furnaces and at high injection rates was studied up to now mainly by mathematical modelling. 7) There are also studies on waste wood use for producing metallurgical coke and for BF injection, 8,9) but the raw wood is difficult to be grinded, because it is composed of rigid structure of cellulose and lignin. 10) In Ref.…”

Section: Charcoal Behaviour By Its Injection Into the Modern Blast Fumentioning

confidence: 99%

Charcoal Behaviour by Its Injection into the Modern Blast Furnace

Babich

Senk

Fernández³

2010

ISIJ Int.

126

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Nowadays the use of charcoal in metallurgy is intimately linked to small blast furnaces in Brazil. Due to the challenge for CO 2 mitigation, interest for charcoal use as a renewable energy source is rising. In the scope of European efforts to mitigate carbon dioxide emissions in the steel industry in the post-Kyoto period, the use of charcoal in cokemaking and ironmaking has been investigated. This paper presents results of an experimental study on charcoal behaviour under the blast furnace simulating conditions performed at the Department of Ferrous Metallurgy, RWTH Aachen University and at the National Centre for Metallurgical Investigations, Madrid. Conditions in the raceway and in the furnace shaft were simulated using thermo-analytical, laboratory and pilot facilities. Charcoal samples were produced in two furnaces for pyrolysis from different wood types at various carbonisation conditions. Furthermore technological and ecological assessment of blast furnace process when injecting different types of charcoal was performed using a mathematical model. All the experiments and calculations were also performed with reference mineral coals for injection. Conversion efficiency of all the tested charcoals is better or comparable with coals. Change in coke rate, furnace productivity and further operation parameters when replacing pulverised coal with charcoal depends on charcoal ash content and composition.KEY WORDS: blast furnace; charcoal injection; CO 2 emission; raceway simulation; secondary consumption. 81© 2010 ISIJ coal Brazilian furnaces not only in terms of larger dimensions and higher operational parameters but also in terms of in-furnace reaction conditions: the chemical reactivity of coke is significantly lower compared with charcoal and Boudouard reaction occurs in the coke blast furnace at higher temperatures. Therefore the degree of indirect reduction in the furnace shaft is higher and consequently carbon monoxide content in top gas and its calorific value are lower. Effect of charcoal injection on large blast furnaces and at high injection rates was studied up to now mainly by mathematical modelling. 7) There are also studies on waste wood use for producing metallurgical coke and for BF injection, 8,9) but the raw wood is difficult to be grinded, because it is composed of rigid structure of cellulose and lignin.10) In Ref. 10) a study was done on biomass injection. In this work, firstly technological and ecological assessment of BF operation when injecting charcoal was conducted using a mathematical model. Afterwards, laboratory and pilot injection trials, microscopic study as well as tests using thermal analysis were carried out to investigate the charcoal behaviour under the blast furnace raceway simulating conditions. Furthermore solution loss reaction of charcoal in the furnace shaft was investigated to evaluate the possibilities of secondary utilisation of charcoal outside the raceway. Effect of charcoal on coke reactivity was studied as well. Injection of PC used in the industrial blast furnace...

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“…The resultant coke obtained by the partial substitution of coal by biomass during coke making has been termed biocoke. It has been suggested that biomass addition can be increased without impairing biocoke strength and yield by increasing the biomass particle size and its density through compressive forming [12]. Charcoal has also been studied to reduce non-renewable carbon emissions [4,13,14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

Castro-Dı́az

Uguna

Florentino

et al. 2017

Journal of Analytical and Applied Pyrolysis

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Hydrochars were obtained after hydrous pyrolysis of a pine Kraft lignin using different reaction conditions (temperature, water content and residence time) and the residues were characterized through a wide range of analytical techniques including high-temperature rheometry, solid-state 13 C nuclear magnetic resonance (NMR), thermal gravimetric analysis (TGA), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and field emission scanning electron microscopy (FE-SEM). The results indicated that an increase in reaction temperature, an increase in residence time or a decrease in water content reduces the amount of fluid material in the residue. The hydrous pyrolysis conditions studied were not able to increase the maturation of lignin, which would result in an increase in the resolidification temperature, but reduced the amount of mineral matter in the hydrochar produced. On the other hand, the hydrochars obtained from pristine lignin, torrefied lignin (300°C, 1 hour) and their 50:50 wt.%/wt.% blend at temperatures of 350°C after 6 hours using 30 ml of water had lower ash contents (<2 wt.%) than the parent lignin (2.5 wt.%) and a high rank good coking coal (10 wt.%). However, the reactivity of the resulting biocokes (>45%) is excessively high compared to that of the good coking coal (10%) and the microstrength of the biocokes (R 1 <1%) is much lower than that of the coal (R 1 =17%). These findings could be rationalized by the high total porosity (>39%) and high microporous surface areas (>400 m 2 /g) of the biocokes and high alkalinity index of the lignins (>27%) compared to those of the coke (27% and 145 m 2 /g) and coal (0.6%), respectively. Furthermore, the biocoke derived from the hydrous pyrolysed torrefied lignin did not agglomerate, which could not be explained by changes in the chemical properties of the material and requires further investigation.

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Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

Cited by 74 publications

References 12 publications

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

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

Charcoal Behaviour by Its Injection into the Modern Blast Furnace

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

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