Experimental analysis of injecting different blends of biomass materials and charcoal in a blast furnace

Abstract

This paper aims to study the possibility of using charcoal, rice husk, sugarcane bagasse, coffee husk, eucalyptus bark and elephant grass and their blends as materials for blast furnace fuel injection. However, any blast furnace fuel must satisfy all the stringent quality requirements such as combustibility, calorific value and ash content. Elaborate processing is also necessary for flowability of the dry pulverized fuel produced from the biomass materials. These properties are evaluated in laboratory by an experimental simulator. The analysis showed the technical feasibility of biomass as an alternative fuel for the blast furnace process, which can contribute as a new energy source. This technique may be one approach to reduce the cost to the steel company by the partial replacement of the fuel materials like coke, and bring further advantages such as the reduction of greenhouse gas generation and obtain carbon credits.

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

“…Reactions (4-5) are the coke solution loss reaction and the coke combustion, Reactions (6)(7)(8)(9) are the BCB reactions in the upper BF. Reactions (10)(11)(12)(13)(14)(15) are the melting of solid burden. Reaction (16) is the direct reduction of molten FeO.…”

“…[5][6][7] Using biomass/biochar in the BF ironmaking system has been tried in several sectors such as cokemaking, sintering, and BF tuyere injection. [8][9][10][11][12] Recently, charging carbon composite briquette in BF is considered to be a promising technology in BF ironmaking for energy saving and it has been applied in industrial practices. [13][14][15][16] Therefore, charging biochar composite briquette (BCB) could be an alternative to introduce renewable carbon into BF.…”

Blast furnace injection for minimizing the coke rate and CO2emissions

“…There is an idea to satisfy the quality requirements on combustibility, calorific value, and ash content and composition by mixing CC and PC [69] or CC and biomass [70]. However, grinding of raw biomass and homogenization of blends should be ensured.…”

Correlating Impacts of Injected Fuels on Carbon Emissions in Blast Furnace with Computational Fluid Dynamics Modeling

“…[22,23] The possibility of injecting charcoal and multiple blends of biomass materials, such as charcoal, rice husk, sugarcane, and eucalyptus, in BFs has been studied experimentally. [24,25] De Assis et al concluded that blends showed better combustion rates than pure materials and that the combustion performance for multiple blends also depended on the injection rate. [24] Namely, the 25% eucalyptus bark/charcoal blend showed the best combustion performance for injection rates of 50 kg thm À1 , whereas 25% sugarcane bagasse and charcoal presented better combustion rate for 100 kg thm À1 injection rates.…”