The influence of water-soluble inorganic matter on combustion of grape pomace and its chars produced by slow and fast pyrolysis

FUEL

卷:284

Article

Mortari, D. A.¹  Perondi, D.²  Rossi, G. B.¹  Bonato, J. L.²  Godinho, M.²  Pereira, F. M.¹ 

[1] Univ Fed Rio Grande do Sul, Mech Engn Dept, Porto Alegre, RS, Brazil

[2] Univ Caxias Sul, Postgrad Program Engn Proc & Technol, Caxias Do Sul, RS, Brazil

关键词: Water leaching;    Biomass;    Char combustion;    Pyrolysis;    NO formation;    Ash;    Drop tube furnace;   

DOI  :  10.1016/j.fuel.2020.118880

来源: Elsevier

【 摘 要 】

The influence of water-soluble inorganic constituents on combustion of raw grape pomace (RGP) and its chars was investigated. Water leaching pretreatment was performed and the leached grape pomace (WLGP) and RGP samples were subsequently characterized by TGA to investigate the combustion under low heating rate. Then, the WLGP and RGP pyrolysis was carried out at slow (5 degrees C/min) and fast (120 degrees C/min) heating rates and the gas and char products were characterized. Finally, the combustion of RGP, WLGP, RGP chars and WLGP chars was analyzed in a drop tube furnace (DTF) to determine the influence of water-soluble inorganic matter on burnout and gas emissions. The water leaching pretreatment removed considerable amounts of K, B, Mg and P. The TGA results showed that the inorganic matter reduction negatively affected the combustion reaction rates, leading to a displacement to higher temperatures of ignition and burnout. Nevertheless, the DTF results showed no relevant effect on combustion efficiency between the RGP and WLGP samples. On the other hand, the pretreatment effect was pronounced during the WLGP chars combustion, in which the burnout of WLGP chars combustion was 30% lower compared to the RGP chars and 50% lower compared to the burnout obtained for raw samples. Additionally, the pretreatment affected the NO and CO formation, increasing the gas species concentrations during WLGP and WLGP chars' combustion.

【 授权许可】

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