Reaction Rate of Coke and Other Carbonaceous Materials with CO&lt;SUB&gt;2&lt;/SUB&gt;

Kawakami, Masahiro; Ohyabu, Takayuki; Mizutani, Yukitaka; Takenaka, Tohru; Yokoyama, Seiji

doi:10.2355/tetsutohagane1955.89.5_581

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The activation energy was estimated as 189, 178 and 191 kJ/mol, respectively for coke, wood charcoal and graphite. These activation energy data accorded well to those in the previous work 1) which were obtained at lower temperature than 1 173 K. Figure 6 show the change in the specific surface area with reaction degree at 1 373 K. The specific surface area increased remarkably about 5 times with the reaction degree up to 20 % and decreased slightly at 25 % both in the case of coke and wood charcoal. That of graphite increased continuously but not so much.…”

Section: Experimental Conditionsupporting

confidence: 89%

“…For that purpose, the reaction kinetics of various carbonaceous materials should be clarified. In the previous work, 1,2) wide variety of materials from the activated carbon to glassy carbon were examined with respect to the reaction with CO 2 in the low temperature range between 823 and 1 173 K. The reaction rates were two orders of magnitude different from each other. In order to explain the difference, the new reaction rate was defined by the reaction rate per unit surface area using the data of specific surface area.…”

Section: Introductionmentioning

confidence: 99%

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Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

et al. 2004

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Section: Experimental Conditionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

et al. 2004

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“…3) Basically, the reactivity of biomass char produced with carbonization of biomass is much higher than that of coke. 11,12) Using the biomass char as a reducing agent in the carbon iron ore composite may cause the high reactivity of the composite. In order to study the reactivity of biomass char, it should be considered that the character of biomass char depends on the condition of carbonization.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

et al. 2009

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Enhancement of reactivity of the burden in the blast furnace can decrease the reducing agent of blast furnace. Besides high reactivity coke, the carbon iron ore composite is considered to be a typical high reactivity burden that can control the thermal reserve zone temperature. Since the reactivity of biomass char is much higher than that of coke, the use of carbon iron ore composite with biomass char will be favorable for decreasing the reducing agent. In the present study the reaction and reducing behavior of the carbon iron ore composite with biomass char were investigated. The gasification rate of biomass char was measured in CO 2 atmosphere, and the reaction rate equation of that was derived. The microscopic structure change of biomass during carbonization was experimentally analyzed. According to the experimental results, the reduction of the composite begins at about 550°C in an inert gas atmosphere, and it is much lower than the composite with coke. Analysis of the reaction of carbon iron ore composite was carried out with the reaction model of the carbon iron ore composite based on a lumped system, in which the reaction rate of biomass char and iron ore were installed. The reaction model shows that the biomass char can improve the reduction behavior of the carbon iron ore composite especially in the lower temperature region. Moreover, the influence of gas atmosphere and the optimum structure of the composite were investigated by the model calculation to estimate the optimum condition of the composite in the blast furnace.KEY WORDS: biomass char; carbon iron ore composite; mathematical model; carbon gasification; blast furnace; carbon dioxide; ironmaking. 1505© 2009 ISIJ used as reducing agent in the composite. Decomposition temperature ranges of cellulose and hemicellulose are from 250 to 400°C and from 180 to 300°C, respectively. 13) If biomass is carbonized in over the temperature ranges, the structure of cellulose would be decomposed and the grind ability of that would be improved. In the present study, carbonization of biomass over 400°C in an inert gas was employed as the pretreatment method of biomass char. Carbonization of BiomassCarbonization of biomass was carried out over 400°C at an inert gas, namely Ar atmosphere. Lumber of Japanese cedar was used as a biomass. That was cut into a piece of 10 mmϫ10 mmϫ50 mm. In order to consider of heat pattern for carbonization, two initial conditions for heating were employed, (1) Hot start condition; the biomass was charged into heated furnace at the specified temperature, and (2) Cold start condition; after charging the biomass into the furnace, the sample heated with increasing temperature at a rate of 0.167°C/s. For both condition, after reaching the specified temperature, the biomass was kept in the furnace for 7 200 s.The composition of raw biomass used in the present experiment and biomass chars carbonized in various temperatures were listed in Table 1. Concentration of C, H and N in organic substance, and ash were analyzed and concentration of O wa...

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“…In the present work, the tensile strength before and after the reaction with CO 2 were evaluated and compared to each other in order to clarify the structure change by the reaction. Experimetnal method [9,10] The reaction rate was obtained by an ordinary thermogravimetric method. The furnace was equipped with SiC heating elements to reach as high a temperature as 1800K.…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics of Coke and some Carbonaceous Materials with CO₂ and Coke Strength after Reaction

Kawakami

Mizutani

Ohyabu

et al. 2004

steel research international

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The reaction rate per unit mass of wood char was an order of magnitude larger than that of coke and graphite and that of glassy carbon was an order of magnitude smaller than the latter. However, the reaction rate per unit surface area of wood char was smaller than that of graphite. The reaction of coke proceeded homogeneously at temperatures lower than 1373 K, while the reaction was restricted to the surface layer at higher temperatures. The tensile strength of coke after reaction decreased with the reaction degree at 1273 K, but was not changed or even increased at 1573 K. This is due to the fact that at 1573 K the core of the sample was not attacked by CO2 but strengthened by further crystallization.

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Reaction Rate of Coke and Other Carbonaceous Materials with CO<SUB>2</SUB>

Cited by 7 publications

References 6 publications

Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

Reaction Kinetics of Coke and some Carbonaceous Materials with CO₂ and Coke Strength after Reaction

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Reaction Rate of Coke and Other Carbonaceous Materials with CO<SUB>2</SUB>

Cited by 7 publications

References 6 publications

Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

Micro Pore Structure and Reaction Rate of Coke, Wood Charcoal and Graphite with CO2

Improvement of Reactivity of Carbon Iron Ore Composite with Biomass Char for Blast Furnace

Reaction Kinetics of Coke and some Carbonaceous Materials with CO2 and Coke Strength after Reaction

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Reaction Kinetics of Coke and some Carbonaceous Materials with CO₂ and Coke Strength after Reaction