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Effects of biochar and ash outflow during updraft partial gasification on process parameters in a moving bed reactor

Mateusz Ochnio, Jacek Kluska, and Dariusz Kardaś

Institute of Fluid Flow Machinery, Polish Academy of Sciences, Gdańsk, Poland



Received: 29 June 2019  Accepted: 20 May 2020


The present paper concerns the partial updraft gasification of wheat–rye straw pellets, using air as a gasification agent. The aim of this paper is to examine the impact of biochar and ash outflow during the updraft gasification process on the parameters of the latter. For this purpose, a series of five experiments with different parameters of biochar and ash outflow and a reference experiment were carried out with a constant amount of supplied air. The results of the research show that higher volumetric outflows of biochar and ash increase the calorific value (from 6.7 to 7.4 MJ/Nm3) and production (from 34.8 to 40.3 Nm3/h) of the producer gas, as well as the rate of fuel feed rate (from 30 to 43 kg/h). Reductions in the yield of gas (from 1.16 to 0.94 Nm3/kgfuel), equivalence ratio (from 0.125 to 0.087), and cold gas efficiency (from 44.7 to 40.2%) were observed. The content of gravimetric tar in producer gas was typical of updraft gasification and fluctuated within a range of 65‒125 g/Nm3.

Keywords: Partial gasification; Updraft gasification; Biochar; Biomass

Full paper is available at

DOI: 10.1007/s11696-020-01214-1


Chemical Papers 74 (11) 4047–4055 (2020)

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