ISSN 2594-357X
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Life cycle assessment (LCA) of forestry and pyrolysis has been used to show that charcoal can be produced with net negative CO2e emissions. The scenario described involved sustainably grown forest plantations, the capture and utilisation of bio-oil as a fuel and the production of electricity from the excess combustible gases from pyrolysis. Cradle-to-gate assessment of the use of charcoal in ironmaking and steelmaking has shown that the co-product credits available from the pyrolysis step flow through to enhance net CO2e reductions available from the use of charcoal to between 41% and 75% for the integrated BF-BOF route, and to between 10% and 15% for the EAF mini-mill route, where emissions are dominated by those associated with electricity generation by coal. Of the eight applications investigated, the most significant was found to be the injection of pulverised charcoal into the blast furnace, which is already practiced in mini-BFs in Brazil. Charcoal properties, particularly volatile matter and density, can be adjusted during pyrolysis to optimise performance. Quality criteria have been proposed for each of the applications. R&D and plant trials have indicated that charcoal performance may be superior to that of conventional fossil-based fuels for blast furnace tuyere injection and as a liquid steel recarburiser. Many technical and economic challenges remain, with the greatest being to initiate economic supply of the large quantity of charcoal needed to meet the potential demand of the steel industry.
Life cycle assessment (LCA) of forestry and pyrolysis has been used to show that charcoal can be produced with net negative CO2e emissions. The scenario described involved sustainably grown forest plantations, the capture and utilisation of bio-oil as a fuel and the production of electricity from the excess combustible gases from pyrolysis. Cradle-to-gate assessment of the use of charcoal in ironmaking and steelmaking has shown that the co-product credits available from the pyrolysis step flow through to enhance net CO2e reductions available from the use of charcoal to between 41% and 75% for the integrated BF-BOF route, and to between 10% and 15% for the EAF mini-mill route, where emissions are dominated by those associated with electricity generation by coal. Of the eight applications investigated, the most significant was found to be the injection of pulverised charcoal into the blast furnace, which is already practiced in mini-BFs in Brazil. Charcoal properties, particularly volatile matter and density, can be adjusted during pyrolysis to optimise performance. Quality criteria have been proposed for each of the applications. R&D and plant trials have indicated that charcoal performance may be superior to that of conventional fossil-based fuels for blast furnace tuyere injection and as a liquid steel recarburiser. Many technical and economic challenges remain, with the greatest being to initiate economic supply of the large quantity of charcoal needed to meet the potential demand of the steel industry.
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LCA; Greenhouse gas emissions; Integrated and EAF steelmaking; Charcoal quality.
LCA; Greenhouse gas emissions; Integrated and EAF steelmaking; Charcoal quality.
Como citar
Mathieson, John G.;
Norgate, Terry;
Jahanshahi, Sharif;
Somerville, Michael A.;
Haque, Nawshad;
Deev, Alex;
Ridgeway, Phillip;
Zulli., Paul.
THE POTENTIAL FOR CHARCOAL TO REDUCE NET
GREENHOUSE GAS EMISSIONS FROM THE AUSTRALIAN
STEEL INDUSTRY
,
p. 1602-1613.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22265
