Effect of residence time on chemical and structural properties of hydrochar obtained by hydrothermal carbonization of water hyacinth

Gao, Ying; Wang, Xianhua; Wang, Jun; Li, Xiangpeng; Cheng, Jianjun; Yang, Haiping; Chen, Hanping

doi:10.1016/j.energy.2013.06.023

Cited by 241 publications

(85 citation statements)

References 31 publications

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“…2 (Dulong equation) as previously reported [20]. This formula is one of the first correlations to estimate the HHV of coals, which is still in used by many researchers today and has also been applied to oils [21].…”

Section: Energy Properties Of the Hydrocharsmentioning

confidence: 98%

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Elaigwu

Greenway

2016

Int J Ind Chem

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Hydrothermal carbonization has been used as a green and effective technique for the preparation of hydrochars from simple carbohydrates, such as glucose. The chemical and structural properties of hydrochars prepared from glucose have been studied. However, the energy properties of hydrochars prepared from microwaveassisted hydrothermal carbonization of glucose have not been studied. Thus, in this study, microwave-assisted hydrothermal carbonization of glucose, and the energy properties of the prepared hydrochars are reported. The preparation involved heating glucose in de-ionized water at 200°C for 5-60 min in a microwave oven. The prepared hydrochars were characterized using scanning electron microscope, nitrogen sorption measurement, Fourier transform infrared spectroscopy, elemental (CHN) analyzer, and nuclear magnetic resonance, and their energy properties studied. The result indicated that, in comparison with previous studies using the classical hydrothermal carbonization process, this approach reduced the processing time greatly from hours to 45 min, while the increase in higher heating value of the hydrochar when compared to that of the starting material was higher in this study than some value previously reported.

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Section: Energy Properties Of the Hydrocharsmentioning

confidence: 98%

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Elaigwu

Greenway

2016

Int J Ind Chem

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“…Hydrothermal carbonization has the ability to deal with extremely wet biomass resources such as sewage sludge, paper mill and also forestry processing residues and agricultural wastes [5]. It is used to produce a solid fuel called hydrochar which has reduced O/C and H/C ratios, increased calorific value and enhanced hydrophobicity [6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of solid biofuels produced from olive pomace with two different conversion methods: torrefaction and hydrothermal carbonization

Gultekin¹,

Olgun²,

Çeliktaş³

2018

IJET

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Olive pomace is a by-product of olive oil production process and has the potential to be a solid biofuel after thermal treatment. In this study, olive pomace was treated by two thermal conversion methods: hydrothermal carbonization (HTC) and torrefaction. Experiments were carried out under the temperature values of 250, 275, 300 and 350°C; reaction times of 10, 20 and 30 minutes for torrefaction and temperature values of 180, 200 and 220°C; reaction time of 2, 3 and 4 hours for HTC. Products with the same energy yield value (62 %) obtained the higher heating values of 23.73 and 25.20 MJ/kg for torrefaction (275°C for 20 minutes) and hydrothermal carbonization (220°C for 2 hours), respectively. Hydrothermal carbonization method has the potential to produce chars at lower temperature values and without a drying process; and obtain products with improved higher heating values, energy yields and atomic O/C and H/C ratios compare to torrefaction products.

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“…The HHV data for HTC coals was similar to that of lignite. Gao et al (2013) studied the chemical and structural properties of water hyacinth hydrochar with increasing time. They found that higher HHV and better structural characterization of hydrochar could be obtained with increased time.…”

Section: Introductionmentioning

confidence: 99%

Chemical, Energetic, and Structural Characteristics of Hydrothermal Carbonization Solid Products for Lawn Grass

Guo¹,

Dong²,

Liu³

et al. 2015

BioResources

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Hydrothermal carbonization (HTC) of lawn grass was carried out at 200 °C and 240 °C for 30 to 180 min. The chemical, energetic, and structural characteristics of HTC solid residues were investigated. Results from HTC experiments indicate that solid mass yield of all solid residues was 31 to 50%. The hydrogen/carbon (H/C) and oxygen/carbon (O/C) atomic ratios of all solid residues were 1.17 to 1.64 and 0.45 to 0.65, respectively. The higher heating value (HHV) increased up to 20.54 MJ/kg with increasing HTC residence time at 240 °C for 180 min. Both XRD patterns and FTIR spectra show that differences occur with samples treated as compared to the raw material. Solid hydrochar exhibited higher ordered structure characteristics and was mainly derived from amorphous components degradation when the residence time was increased from 30 to 180 min at 200 °C, while hydrochar formed from cellulose components degradation with increased residence time at 240 °C. According to the results studied, it was found that prolonged residence time was favorable to the formation of hydrochar from lawn grass.

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Effect of residence time on chemical and structural properties of hydrochar obtained by hydrothermal carbonization of water hyacinth

Cited by 241 publications

References 31 publications

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Comparison of solid biofuels produced from olive pomace with two different conversion methods: torrefaction and hydrothermal carbonization

Chemical, Energetic, and Structural Characteristics of Hydrothermal Carbonization Solid Products for Lawn Grass

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