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- Authors
Rouanet, Arnaud 
- Abstract
- Thermochemical gasification of biomass produces a syngas that suffers two main drawbacks: a low energy density, measured by its Lower Heating Value (LHV) and the residual tar content. In this paper, steam injection and air enrichment are studied as ways to tackle both challenges. We have conducted experiments on wood chips gasification in a pilot-scale two-stage down-draft gasifier, with saturated and superheated steam (250°C) and a steam-to-biomass ratio up to 0.6. Experimental results show a 50% reduction in tar species heavier than benzene, in particular phenolic compounds and PAHs, consistent with the reviewed literature on lab-scale experiments. Steam injection also yields a linear increase in the H2/CO ratio and an improvement in the carbon conversion efficiency, but no clear gain on the syngas LHV. Regarding oxygen injection, simulations using an equilibrium model show that a 50% air enrichment can increase the syngas LHV up to 8 MJ/Nm3 (+60%), thanks to the reduced N2 dilution.
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Citations
Rouanet, A., & Jeanmart, H. (2023). Experimental study of the effects of steam injection on Lower Heating Value and tar content in two-stage downdraft wood gasification. MCS-12 - 12th Mediterranean Combustion Symposium, Luxor (Egypt). https://hdl.handle.net/2078.5/27807