Browsing by Author "Kemal M."

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Interactions between components in coking of coal blends; [KömüR Karişimlarinin Koklaştirilmasinda Bi̇leşenler Arasi Eti̇ki̇leşi̇mler]
    (2004) Kemal M.; Arslan V.; Cengizler H.
    This study has been carried out for the purpose of determination of interactions among the components in coal blends during the coking process. For this purpose, the blends of cokable Zonguldak coal (ZK) with air-dried (TK), semicoked both at 550°C (TK550) and 900°C (TK900) Tunçbilek lignite were prepared. The plasticity, dilatation, contraction of these blends and the strength of the cokes produced from these blends were determined. The experimental data obtained were evaluated and it was determined that the lignite, when carbonised at about 500°C, completes its chemical breakdown, terminates the evolution of its volatile matter and contraction process, improves its surface wetting behavior and thus exhibits the most favorable properties as far as the cokability of coal blend is concerned.
  • No Thumbnail Available
    Item
    Formcoke production from char fines of hard brown coals by air curing
    (2006) Cengizler H.; Kemal M.
    The purpose of the present study was to explore the technical feasibility of formcoke production from non-coking bright hard brown coals and pitch as a binder by air curing. The briquettes obtained from the chars of Soma coals carbonised at 500, 600, 700, 800 and 900°C with 12% pitch were air cured in a streaming gas containing 16%O2 (air+N2) for 120 min at 270°C and the formcoke strength was found to be 10-40% higher than that of raw briquettes. Under the prevailing conditions, the formcoke strength and the apparent specific gravity of the green and formcoke briquettes increased as the carbonisation temperature increased, reaching a maximum at the optimum carbonisation temperature of 800°C. M40 and M10 values and the compressive strength of SK800 formcokes were determined to be 92·3, 7·7% and 23·5 MPa respectively being similar to those of conventional cokes produced at coke ovens. The optimum curing conditions (pitch content, curing time and temperature) were determined using TK800 char. The optimum curing time for TK800 briquettes at 220°C was determined to be 90 min. The formcoke strength of TK800 briquettes subjected to a thermal treatment at 220°C was lower than that of the briquettes air cured at the same temperature. The optimum curing temperature for TK800 briquettes with 10% pitch and cured in a gas stream containing 16%O2 in terms of formcoke strength was determined to be 285°C. M40 and M10 values and the compressive strength of TK800 formcokes were determined to be 91, 8·1% and 19·6 MPa respectively. The experimental results reveal the advantages of the method because the formcokes produced possess suitable properties for various metallurgical processes and smokeless fuel consumption. The gas and tar obtained during the carbonisation of raw coal are the added benefits. © 2006 Institute of Materials, Minerals and Mining and The AusIMM.
  • No Thumbnail Available
    Item
    Variation in coal surface wettability with carbonization temperature and effect of pitch on coal fluidity
    (Grup Matbaacilik, 2009) Cengizler H.; Kemal M.
    The effect of pitch (Z) ratio on the fluidity of coal and of carbonization temperature on the wetting behaviour of coal surface in the binary mixtures have been investigated with the experimental runs performed by the constant-torque Gieseler plastometer. The binary mixtures consisted of Tunçbilek brown coal (TK) or its semicokes and Z in different ratios. TK200, TK400, TK600, TK800 and TK1000 semicokes were obtained at 200°, 400 °, 600 °, 800 ° and 1000 °C carbonization temperatures respectively. It was found that the maximum fluidity values of the binary mixtures increases with increasing Z ratios. The lowest maximum fluidity values were obtained in TK400+Z binary mixture and it was shown that TK400 is the semicoke which has the optimum surface wetting behaviour. It was determined that the maximum fluidity values increase in the order of TK400, TK200, TK, TK600, TK800 and TK1000. The surface wettability also decreases in the same order.