Optimized co-combustion of hydrochar and coal via dual-lance injection for enhanced blast furnace performance

Qi Wang, Xu XiaoFeng, Mao Mu and Shuang Wang

Energy, 2025, vol. 336, issue C

Abstract: Due to the unstable supply and low density of biomass, a flexible double-lance injection method is more advantageous for the application of biomass in blast furnaces. This paper investigates the co-combustion behavior of coal and hydrochar in a blast furnace using a double-lance injection system through numerical simulation. The effects of varying hydrochar injection ratios and lance positions on gas flow, temperature distribution, gas concentration, and particle burnout rates within the blast furnace are assessed. The results show that an optimal 1:1 coal-to-hydrochar ratio maintains high combustion temperatures and improves burnout efficiency. Placing the hydrochar lance 150 mm behind the coal lance boosts flame temperatures by 93 K and coal burnout by 3.6 %. A lance separation of 70 mm further increases flame temperature by 105 K and coal burnout by 4.3 %. This supports flexible hydrochar injection for greener ironmaking.

Keywords: Blast furnace; Hydrochar; Co-combustion; CFD; Numerical simulation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:336:y:2025:i:c:s0360544225042082

DOI: 10.1016/j.energy.2025.138566

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