Influence of biomass on metallurgical coke quality

Abstract Two industrial coal blends used in coke making were subjected to tests in order to assess the influence of waste sawdust (SC2 from chestnut and SP1 from pine) on the quality of the coke produced. The biomass was added in quantities of up to 5 wt.%. It was observed that biomass produced a substantial decrease in the plastic properties of the industrial coal blend, with reductions in Gieseler maximum fluidity of around 50% for 3 wt.% additions of the two different sawdusts. Carbonizations with sawdust additions ranging from 0.75 to 5 wt.% were carried out in a movable wall oven of 17 kg capacity. The bulk density of the charge was observed to decrease with increasing amounts of sawdust with negative consequences on the quality of the cokes produced. Mechanical strength was determined by means of the JIS test. Coke reactivity and post-reaction strength (CRI/CSR indices) were also assessed. The amount of sawdust added was low to prevent any deterioration in coke quality. The advantage of using biomass in coking blends should be seen as a possible way to reduce costs and CO 2 emissions and to incorporate alternative raw materials in coke production.

[1]  M. Diez,et al.  On the relationship between coal plasticity and thermogravimetric analysis , 2003 .

[2]  Ramon Alvarez,et al.  Effect of the addition of waste sawdust on thermoplastic properties of a coal , 2013 .

[3]  Tao Wu,et al.  Characteristics and synergistic effects of co-firing of coal and carbonaceous wastes , 2013 .

[4]  Michitaka Sato,et al.  Reduction of CO2 Emissions from Integrated Steel Works and Its Subjects for a Future Study , 2005 .

[5]  Prabir Basu,et al.  Biomass Gasification and Pyrolysis: Practical Design and Theory , 2010 .

[6]  Terry Norgate,et al.  Environmental and Economic Aspects of Charcoal Use in Steelmaking , 2009 .

[7]  M. Diez,et al.  Influence of additives of various origins on thermoplastic properties of coal , 2009 .

[8]  Ka Wing Ng,et al.  Reactivity of bio-coke with CO2 , 2011 .

[9]  M. J. Reynolds,et al.  Influence of carbonization conditions on the development of different types of optical anisotropy in cokes , 1973 .

[10]  Wen-Jhy Lee,et al.  Thermogravimetric analysis and kinetics of co-pyrolysis of raw/torrefied wood and coal blends , 2013 .

[11]  M. J. Reynolds,et al.  Optical anisotropy of carbonized coking- and caking-coal vitrains , 1979 .

[12]  J. Patrick,et al.  Impact of low-cost filler material on coke quality , 2007 .

[13]  Haiping Yang,et al.  Characteristics of hemicellulose, cellulose and lignin pyrolysis , 2007 .

[14]  Nawshad Haque,et al.  Biomass as a Source of Renewable Carbon for Iron and Steelmaking , 2012 .

[15]  J. T. Price,et al.  Possible CO2 mitigation via addition of charcoal to coking coal blends , 2009 .

[16]  E. Pierron.  Plastic properties of coal , 1959 .

[17]  Shaoping Xu,et al.  Co-pyrolysis of biomass and coal in a free fall reactor , 2007 .

[18]  Anthony Dufour,et al.  The Effect of Biomass on Fluidity Development in Coking Blends Using High-Temperature SAOS Rheometry , 2012 .

[19]  M. Diez,et al.  Evaluation of bituminous wastes as coal fluidity enhancers , 2012 .

[20]  Frank Pettersson,et al.  Optimal Resource Allocation in Integrated Steelmaking with Biomass as Auxiliary Reductant in the Blast Furnace , 2012 .

[21]  F. G. Emmerich,et al.  Babassu charcoal: A sulfurless renewable thermo-reducing feedstock for steelmaking , 1996 .

[22]  Ramon Alvarez,et al.  Coal for metallurgical coke production: predictions of coke quality and future requirements for cokemaking , 2002 .

[23]  Tetsuya Nagasaka,et al.  Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties , 2008 .

[24]  Benjamin L. Legendre,et al.  Biomass Pyrolysis Kinetics: A Comparative Critical Review with Relevant Agricultural Residue Case Studies , 2011 .

[25]  G. Gerbaud,et al.  NMR analysis of the transformation of wood constituents by torrefaction , 2012 .

[26]  C. L. Y. Leon,et al.  New perspectives in mercury porosimetry , 1998 .

[27]  Dermot J. Roddy,et al.  Biomass Gasification and Pyrolysis , 2012 .

[28]  R. Loison.  Coke: Quality and Production , 2013 .

[29]  Hartmut Spliethoff,et al.  TG-FTIR characterization of coal and biomass single fuels and blends under slow heating rate conditions: Partitioning of the fuel-bound nitrogen , 2010 .

[30]  J. Patrick,et al.  Optical anisotropy in cokes from high-rank coals , 1988 .

[31]  Chatphol Meesri,et al.  Pyrolytic characteristics of blended coal and woody biomass , 2004 .

[32]  J. Patrick,et al.  The characterization of interfaces between textural components in metallurgical cokes , 1994 .

[33]  Hari B. Vuthaluru,et al.  Thermal behaviour of coal/biomass blends during co-pyrolysis , 2004 .