Effect of hydrothermal carbonization on the properties, devolatilization, and combustion kinetics of Chilean biomass residues

Monedero, Esperanza; Lapuerta, Magı́n; Pazo, Amparo; Díaz-Robles, Luis A.; Pino-Cortés, Ernesto; Campos, Valeria; Vallejo, Fidel; Cubillos, Francisco; Gómez, J.

doi:10.1016/j.biombioe.2019.105387

Cited by 30 publications

(11 citation statements)

References 51 publications

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“…Here: Table 4 Hydrothermal carbonization experiments were performed in a high-pressure reactor, model HiPR-SF5L, with a volume capacity of 5 L. The detailed description of the process can be found in previous works of this research group [3,11] . For the kinetic study, fifteen experimental runs for each biomass were carried out with a biomasswater ratio (B/W) equal to 0.10.…”

Section: Data Collectionmentioning

confidence: 99%

“…Hydrothermal carbonization (HTC) is used for the waste biomass conversion into a solid product (hydrochar), obtaining an increase in the carbon content [1] and the higher calorific value [2] . Prior studies have shown other advantages of hydrochar, such as hydrophobic properties [3] and a lower ash content [4] . Currently, the hydrochar is used as a biofuel in boilers and stoves [5] , as a precursor of activated carbon [6] , catalysts [7] , capacitors, among others [8,9] .…”

Section: Introductionmentioning

confidence: 99%

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Experimental study and validation of a kinetic scheme for hydrothermal carbonization reactions

et al. 2020

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This study presents a new kinetic scheme for the mass yield prediction of waste lignocellulosic biomasses treated by Hydrothermal Carbonization (HTC). The proposed reactions are based on the decomposition, solubilization, and polymerization of each main fraction of the biomass: cellulose, hemicellulose, and lignin. The ash content was assumed to be inert. The kinetic parameters have been obtained by non-linear adjustment using a data set with 220 experimental runs collected from the literature. The results indicate that the pre-exponential factors range was from 7.33 x10 1 to 1.412x10 5 min -1 , and activation energies were between 33.75 y 225.3 kJ/mol.A good fit is achieved between the observed and predicted data with an R 2 of 0.81 and an RMSE of 7.7 %. The proposed scheme was validated with the experimental data obtained by the HTC of sawdust (Pinus radiata) and rapeseed (Brassica napus). The experiments were carried out at temperatures of 190, 220, and 250 ºC and reaction times of 0, 30, 60, 90, and 120 min. The predicted values showed an average error of 2.3 and 3.5 %, respectively. Therefore, the kinetic scheme is a useful tool in the conversion analysis of waste biomass treated by HTC.

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Section: Data Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study and validation of a kinetic scheme for hydrothermal carbonization reactions

et al. 2020

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“…HiPR-SF5L, with a volume capacity of 5 L. The detailed description of the process can be found in previous works of this research group [3,11] . For the kinetic study, fifteen experimental runs for each biomass were carried out with a biomasswater ratio (B/W) equal to 0.10.…”

Section: Data Collectionmentioning

confidence: 99%

Experimental Study and Validation of a Kinetic Scheme for Hydrothermal Carbonization Reactions

Vallejo

Díaz-Robles

Poblete

et al. 2020

Preprint

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This study presents a new kinetic scheme for the mass yield prediction of waste lignocellulosic biomasses treated by Hydrothermal Carbonization (HTC). The proposed reactions are based on the decomposition, solubilization, and polymerization of each main fraction of the biomass: cellulose, hemicellulose, and lignin. The ash content was assumed to be inert. The kinetic parameters have been obtained by non-linear adjustment using a data set with 220 experimental runs collected from the literature. The results indicate that the pre-exponential factors range was from 7.33 x101 to 1.412x105 min-1, and activation energies were between 33.75 y 225.3 kJ/mol. A good fit is achieved between the observed and predicted data with an R2 of 0.81 and an RMSE of 7.7 %. The proposed scheme was validated with the experimental data obtained by the HTC of sawdust (Pinus radiata) and rapeseed (Brassica napus). The experiments were carried out at temperatures of 190, 220, and 250 ºC and reaction times of 0, 30, 60, 90, and 120 min. The predicted values showed an average error of 2.3 and 3.5 %, respectively. Therefore, the kinetic scheme is a useful tool in the conversion analysis of waste biomass treated by HTC.

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“…To obtain a pyrolytic biochar with a similar ratio of energy densification and similar higher heating values as hydrochar, more severe conditions in pyrolysis are needed [22]. HTC of different waste biomasses including forestry and agricultural residues has been conducted with the aim of use hydrochar as solid biofuel [23,24]. As dewatering, dechlorination, denitrification, and coalification reactions take place during HTC, an important reduction in pollutant emissions in combustion can be achieved [25].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

et al. 2020

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Hydrothermal carbonization (HTC) allows the conversion of organic waste into a solid product called hydrochar with improved fuel properties. Olive tree pruning biomass (OTP), a very abundant residue in Mediterranean countries, was treated by HTC to obtain a solid fuel similar to coal that could be used in co-combustion processes. Three different reaction temperatures (220, 250, and 280 °C) and reaction times (3, 6, and 9 h) were selected. The hydrochars obtained were extensively analyzed to study their behavior as fuel (i.e., ultimate, proximate, fiber and thermogravimetric analysis, Fourier-transform infrared spectroscopy (FTIR), activation energy, and combustion performance). The concentrations of cellulose, hemicellulose, and lignin in the samples depict a clear and consistent trend with the chemical reactions carried out in this treatment. Regarding O/C and H/C ratios and HHV, the hydrochars generated at more severe conditions are similar to lignite coal, reaching values of HHV up to 29.6 MJ kg−1. The higher stability of the solid is reflected by the increase of the activation energy (≈60 kJ mol−1), and ignition temperatures close to 400 °C. With this, HTC is a proper thermal treatment for the management of raw OTP biomass and its further conversion into a solid biofuel.

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Effect of hydrothermal carbonization on the properties, devolatilization, and combustion kinetics of Chilean biomass residues

Cited by 30 publications

References 51 publications

Experimental study and validation of a kinetic scheme for hydrothermal carbonization reactions

Experimental study and validation of a kinetic scheme for hydrothermal carbonization reactions

Experimental Study and Validation of a Kinetic Scheme for Hydrothermal Carbonization Reactions

Hydrothermal Carbonization of Olive Tree Pruning as a Sustainable Way for Improving Biomass Energy Potential: Effect of Reaction Parameters on Fuel Properties

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