Conversion of sweet potato waste to solid fuel via hydrothermal carbonization

Chen, Xinfei; Ma, Xiaoqian; Peng, Xiaowei; Lin, Yousheng; Yao, Zhen

doi:10.1016/j.biortech.2017.10.096

Cited by 172 publications

(66 citation statements)

References 38 publications

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“…As seen from the proximate analysis, volatile matter decreased by 7.5%. Compared to wood sawdust, its hydrochar has higher carbon content (increased by 14%) and lower hydrogen content, mainly due to hydrolysis, dehydration, and decarboxylation reactions …”

Section: Resultsmentioning

confidence: 99%

“…Compared to wood sawdust, its hydrochar has higher carbon content (increased by 14%) and lower hydrogen content, mainly due to hydrolysis, dehydration, and decarboxylation reactions. 9,17 As a result of higher fixed carbon content and lower volatile matter, heating value of sawdust hydrochar was 14% higher than original sawdust sample. The higher fixed carbon content is the result of lignin, which is hardly changed in the biomass structure under hydrothermal conditions.…”

Section: T Eamentioning

confidence: 98%

“…To minimize the disadvantage of low energy density, biomass might be torrefied. Torrefaction not only increases the energy density, it also alters the pore structure . Torrefaction has two applications, which are named as “dry torrefaction” and “wet torrefaction” based on process conditions .…”

Section: Introductionmentioning

confidence: 99%

“…Torrefaction not only increases the energy density, it also alters the pore structure. 9 Torrefaction has two applications, which are named as "dry torrefaction" and "wet torrefaction" based on process conditions. 10,11 Dry torrefaction, or "mild pyrolysis," occurs in inert atmosphere by heating up the material up to 300 C with low heating rates.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis and combustion characteristics and kinetics of wood sawdust and wood sawdust hydrochar

Kabakcı

2019

Env Prog and Sustain Energy

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This study compares the pyrolysis and combustion characteristics with the kinetics of wood sawdust and its hydrochar. Wood sawdust hydrochar was obtained by the hydrothermal treatment of wood sawdust (biomass/water: 1 g/4 mL) at 220°C, where the residence time was set as 90 min. After hydrothermal carbonization, carbon content and heating value were both increased by 14%. Pyrolysis and combustion of wood sawdust and its hydrochar were performed by thermogravimetric analysis at 10, 20, 30, and 40°C/min. Kissinger–Akahira–Sunose (KAS) method, Friedman method, Flynn–Wall–Ozawa (FWO) method, and Kissinger method were used for analyzing the pyrolysis data. For combustion, only KAS and FWO methods were used to determine the kinetic parameters. As compared to wood sawdust pyrolysis, average activation energy of hydrochar pyrolysis was lower (150.36 kJ/mol by using KAS method, 153.05 kJ/mol by using FWO method). Based on mean activation energies, pyrolysis reaction of hydrochar was more favorable than its combustion. In combustion, average activation energy of hydrochar combustion reaction was higher; indicating that combustion of wood sawdust was more favorable.

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Section: Resultsmentioning

confidence: 99%

Section: T Eamentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrolysis and combustion characteristics and kinetics of wood sawdust and wood sawdust hydrochar

Kabakcı

2019

Env Prog and Sustain Energy

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“…The key combustion characteristic parameters, such as ignition temperature (T i ), maximum combustion rate temperature (T m ) and burnout temperature (T b ) were determined from the TG and DTG (first order derivative of TG curve) profiles according to previous study [19]. Comprehensive combustibility index S was applied to evaluate the combustion characteristics of tobacco stem, hydrochar and pellets, and was calculated from the following equation: [20]…”

Section: Combustion Behavior Analysismentioning

confidence: 99%

Preparation and characterization of nano silver immobilized hydrochar derived from hydrothermal carbonization of tobacco stem

Liang

Liu

Wang

et al. 2020

Mater. Res. Express

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In this present study, silver nanoparticles (AgNPs) immobilized hydrochar was prepared through a facile one-pot co-hydrothermal carbonization of tobacco stem and silver nitrate. The effect of concentration of silver precursor, hydrothermal temperature and reaction time on the chemical compositions, structural property, combustion performance, as well as gaseous products release behavior of the resultant AgNPs immobilized hydrochar were evaluated. The co-hydrothermal treatment decreased the volatile matter while increased the ash content of hydrochar. Single-phase AgNPs were successfully generated and evenly immobilized onto the hydrochar during the hydrothermal process. The immobilized AgNPs played a notable catalytic role during the char combustion stage, thereby decreased the ignition temperature, burnout temperature and maximum rate temperature for char combustion. Meanwhile, TG-FTIR analysis suggested that the emission amount of harmful gas CO during hydrochar combustion was reduced due to the catalytic effect of AgNPs. This phenomenon may indicate the appropriate amount of nanoparticles immobilization could enhance the combustion behavior of hydrochar fuel.

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