Abstract
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.
Highlights
Gasification is defined as the multi-stage conversion of carbonaceous feedstock into gaseous fuels or/and chemical products under atmospheric or higher pressures with an oxygen deficiency (Basu 2013)
No studies have accounted for the impact of biochar outflow on the parameters of the gasification process
The highest temperature change corresponds to the pyrolysis zone, which could be observed based in temperature drop between thermocouples T3 and T2
Summary
Gasification is defined as the multi-stage conversion of carbonaceous feedstock into gaseous fuels or/and chemical products under atmospheric or higher pressures with an oxygen deficiency (Basu 2013). Experiments involving the gasification of various fuels (Bhutto et al 2013; Ramos et al 2018; Taupe et al 2016; Widjaya et al 2018) are aimed at the generation of producer gas with the highest possible hydrogen content (Ning et al 2018; Rodriguez Correa and Kruse 2018), issues of tar generation and reduction (Rakesh and Dasappa 2018; Valderrama Rios et al 2018), or the potential for utilizing various types of solid waste (Lopez et al 2018; Oboirien and North 2017; Watson et al 2018). Research which partially addresses the above issue concerns partial gasification of coal in fluidized or flow reactors with gasification or combustion of the obtained biochar in another reactor
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