The influence of water-soluble inorganic matter on combustion of grape pomace and its chars produced by slow and fast pyrolysis. (15th January 2021)

• Record Type: Journal Article
• Authors: Mortari, D.A.; Perondi, D.; Rossi, G.B.; Bonato, J.L.; Godinho, M.; Pereira, F.M.
• Is Part Of: Fuel. Volume 284(2021)
• Publication Date: 2021-01-15
• Subjects: Water leaching -- Biomass -- Char combustion -- Pyrolysis -- NO formation -- Ash -- Drop tube furnace; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.118880
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The water leaching pretreatment was performed to grape pomace sample. The TGA results showed reduction in combustion reaction rates. From pyrolysis results, the pretreatment increased the char and gas HHV. Char burnout of leached sample was 30% lower than the char burnout of raw sample. The reduction of water-soluble inorganics on biomass increased the NO formation. Abstract: 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 °C/min) and fast (120 °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.