Thermodynamic improvement of solar driven gasification compared to conventional one

Cesare Freda, Pietro Tarquini, Vinod Kumar Sharma and Giacobbe Braccio

Energy, 2022, vol. 261, issue PA

Abstract: The driving of biomass gasification with the heat provided by medium temperature solar technology is thermodynamically studied to understand principally the theoretical potential of this integration in terms of cold gas efficiency and gas composition, without considering kinetic aspects and not breaking down in detail plant solutions and energy balances of plant components. In medium temperature solar driven gasification, solar heat is used to heat the gasification medium up to a temperature of 500 °C. The considered conventional gasification technologies are air gasification, air-steam gasification, allothermal steam gasification and supercritical water gasification. In air gasification the investigated independent variable is the equivalence ratio. In air-steam and allothermal steam gasification, the investigated independent variable is the steam/biomass ratio. In supercritical water gasification the investigated independent variable is the organic feed concentration. Gasification temperature was set at 800 °C for air-steam gasification and allothermal steam gasification; it was set at 600 °C for supercritical water gasification. The main dependent variable detected are dry gas yield, gas composition and heating value, char residue. The highest cold gas efficiency was calculated in the case of solar driven supercritical water gasification, it was 91%, when the organic feed concentration was 20 wt %.

Keywords: Equivalence ratio; Steam gasification; Cold gas efficiency; Water conversion; Gibbs energy (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:261:y:2022:i:pa:s0360544222018527

DOI: 10.1016/j.energy.2022.124953

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