(I) The Tensile Strength of Blast-Furnece Coke

Miyagawa, Tsugio; Fujishima, Ichiro

doi:10.3775/jie.54.12_983

Cited by 24 publications

(14 citation statements)

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“…8) Such strength was much greater than that favored for use in blast furnace, around 5 MPa. [15][16][17][18] This work was followed by those on coke preparation from hydrothermally treated Indonesian lignites, 9) coke preparation from Victorian lig-nites pretreated by acid washing and others, 10) and lignite properties and briquette thermal behaviors influencing coke strength. 11) In terms of conventional properties relevant to coke production by coke-oven method, such as Gieseler maximum fluidity and surface reflectance, lignite is a worst type of feedstock.…”

Section: Introductionmentioning

confidence: 99%

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

et al. 2019

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In continuation of the present authors' studies on production of high strength coke from lignite by sequential binderless hot briquetting and carbonization, this study has been carried out aiming at proposing methods to produce high strength coke from non-/slightly caking coals of subbituminous to bituminous rank. This paper firstly demonstrates preparation of cokes with cold tensile strengths above 10 MPa from two single non-caking coals (particle size; < 106 μm) by applying briquetting at temperature and mechanical pressure of over 200°C and 100 MPa, respectively. Such strength of coke is obtained over a wide range of heating rate, 3-30°C/min, during carbonization with final temperature of 1 000°C. Then, a simple pretreatment, fine pulverization of coal to particle sizes smaller than 10 or 5 μm, is examined. This pretreatment enables to prepare coke with tensile strength even over 25 MPa, by decreasing porosity of resulting coke and more extensively the size of macropores simultaneously. The coke strength changes with carbonization temperature having a particular feature; significant development of strength at 600-1 000°C, i.e., after completion of tar evolution, in which macropores and non-porous (dense) part of coke shrink in volume, inducing bonding and coalescence of particles and thereby arising the strength.

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Section: Introductionmentioning

confidence: 99%

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

et al. 2019

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“…Thus, the physical meaning of them seems rather ambiguous. There have been some reports which show the method to evaluate in-directly tensile strength from crushing test [6][7][8]. But, only one reported the tensile strength after the reaction [7].…”

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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“…Therefore fracture happens by tensile and shear stress. 2) 3.2.2. Strain-load Curve of Coke Figure 9 shows strain-load curve, whose direction is normal to load, of calculation and experiment of the head part coke.…”

Section: Analytical Object and Conditionsmentioning

confidence: 99%

“…[1][2][3][4] In the diametral-compression test, when a cylindrical specimen is diametrically compressed between two flat plates, tensile stress is developed along the direction normal to load and causes the fracture along the diametral plane between loading parts. It is possible to measure tensile strengths of brittle materials such as concrete and coke by using this test.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Changes in Microscopic Structures on Coke Strength in Carbonization Process

et al. 2011

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A tensile strength of a coke picked from different distance away from coke oven wall was experimentally measured to investigate the effect of carbonization process by using the diametral-compression test. Changes of the microscopic structure of the coke picked from different distance away from coke oven wall were also observed to evaluate the effect of those on coke strength. The tensile strength of the coke vertically picked from the distance of 0-60 mm away from coke oven wall was higher than one picked from the distance of 60-120 mm away from coke oven wall. The microscopic structure of the coke vertically picked from the distance of 0-60 mm from coke oven wall was more homogeneous than the one vertically picked from the distance of 60-120 mm away from coke oven wall. Furthermore, a fracture analysis using RBSM (Rigid Bodies-Spring Model) assuming diametral-compression test was carried out in order to investigate fracture behavior of the coke. Numerical results showed that the fracture started at the near center of analytical object and crack vertically propagates by shear stress and tensile stress. Strain-load curve of analytical result was in good agreement with one of experimental result. It is supposed that fracture analysis using RBSM assuming diametral-compression test can reproduce the fracture behavior of coke.

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(I) The Tensile Strength of Blast-Furnece Coke

Cited by 24 publications

References 0 publications

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

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

The Effect of Changes in Microscopic Structures on Coke Strength in Carbonization Process

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(I) The Tensile Strength of Blast-Furnece Coke

Cited by 24 publications

References 0 publications

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

Production of High-strength Cokes from Non-/Slightly Caking Coals. Part I: Effects of Coal Pretreatment and Variables for Briquetting and Carbonization on Coke Properties

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

The Effect of Changes in Microscopic Structures on Coke Strength in Carbonization Process

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