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Biomass as blast furnace injectant: Considering availability, pretreatment and deployment in the Swedish steel industry
Swerea MEFOS AB, Center for Process Integration in Steelmaking, Swerea MEFOS, Luleå.
Division of Energy and Furnace Technology, KTH Royal Institute of Technology.
SSAB EMEA, Luleå, SSAB Europe.
SSAB EMEA, Luleå, SSAB Europe.
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2015 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 102, p. 217-226Article in journal (Refereed) Published
Abstract [en]

We have investigated and modeled the injection of biomass into blast furnaces (BF), in place of pulverized coal (PC) from fossil sources. This is the easiest way to reduce CO2 emissions, beyond efficiency-improvements. The considered biomass is either pelletized, torrefied or pyrolyzed. It gives us three cases where we have calculated the maximum replacement ratio for each. It was found that charcoal from pyrolysis can fully replace PC, while torrefied material and pelletized wood can replace 22.8% and 20.0% respectively, by weight.Our energy and mass balance model (MASMOD), with metallurgical sub-models for each zone, further indicates that (1) more Blast Furnace Gas (BFG) will be generated resulting in reduced fuel consumption in an integrated plant, (2) lower need of limestone can be expected, (3) lower amount of generated slag as well, and (4) reduced fuel consumption for heating the hot blast is anticipated. Overall, substantial energy savings are possible, which is one of the main findings in this paper.Due to the high usage of PC in Sweden, large amounts of biomass is required if full substitution by charcoal is pursued (6.19 TWh/y). But according to our study, it is likely available in the long term for the blast furnace designated M3 (located in Luleå).Finally, over a year with almost fully used production capacity (2008 used as reference), a 28.1% reduction in on-site emissions is possible by using charcoal. Torrefied material and wood pellets can reduce the emissions by 6.4% and 5.7% respectively. The complete replacement of PC in BF M3 can reduce 17.3% of the total emissions from the Swedish steel industry.

Place, publisher, year, edition, pages
2015. Vol. 102, p. 217-226
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-10497DOI: 10.1016/j.enconman.2015.04.013ISI: 000358809400023Scopus ID: 2-s2.0-84945440369Local ID: 94f98331-dd07-442d-8883-c697478c2da9OAI: oai:DiVA.org:ltu-10497DiVA, id: diva2:983442
Note
Validerad; 2015; Nivå 2; 20150427 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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