Study on gasification mechanism of biomass waste in supercritical water based on product distribution

Wang, Cui; Jin, Hui; Feng, Huifang; Wei, Wenwen; Chen, Cao; Cao, Wen

doi:10.1016/j.ijhydene.2020.02.146

Cited by 40 publications

(18 citation statements)

References 53 publications

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“…Gasification in supercritical water (SCW) can directly use the biomass without drying process, since the reaction occurs in water phase. An experimental study on cornstalk gasification in SCW, carried out in the temperature range of 500-800 • C, a reaction time of 1-15 min and a feedstock concentration of 1-9%, has shown that the carbon gasification efficiency reaches 99% at the temperature of 700 • C, reaction time of 15 min and biomass concentration of 3% [74]. A parametric research on supercritical water gasification of food waste conducted with a micro quartz tube batch reactor (Figure 3), demonstrated that the complete gasification can be basically realized with a carbon gasification efficiency of 98% at a temperature of 850 • C, a concentration of 5 wt% and residence time of 10 min [75].…”

Section: Gasificationmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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Due to its characteristics, hydrogen is considered the energy carrier of the future. Its use as a fuel generates reduced pollution, as if burned it almost exclusively produces water vapor. Hydrogen can be produced from numerous sources, both of fossil and renewable origin, and with as many production processes, which can use renewable or non-renewable energy sources. To achieve carbon neutrality, the sources must necessarily be renewable, and the production processes themselves must use renewable energy sources. In this review article the main characteristics of the most used hydrogen production methods are summarized, mainly focusing on renewable feedstocks, furthermore a series of relevant articles published in the last year, are reviewed. The production methods are grouped according to the type of energy they use; and at the end of each section the strengths and limitations of the processes are highlighted. The conclusions compare the main characteristics of the production processes studied and contextualize their possible use.

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Section: Gasificationmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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“…In the light of the current knowledge [53][54][55][56], the accuracy of the data is questionable. In other words, modern thermogravimetry would likely produce different figures [57]. Currently, one observes a proliferation of publications, as exemplified by Refs.…”

Section: The Kineticsmentioning

confidence: 99%

On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets

et al. 2021

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The subject of this work is the mathematical modelling of a counter-current moving-bed gasifier fuelled by wood-pellets. Two versions of the model have been developed: the one-dimensional (1D) version-solving a set of Ordinary Differential Equations along the gasifier height-and the three-dimensional (3D) version where the balanced equations are solved using Computational Fluid Dynamics. Unique procedures have been developed to provide unconditionally stable solutions and remove difficulties occurring by using conventional numerical methods for modelling counter-current reactors.The procedures reduce the uncertainties introduced by other mathematical approaches, and they open up the possibility of straightforward application to more complex software, including commercial CFD packages. Previous models of Hobbs et al., Di Blasi and Mandl et al. used a correction factor to tune calculated temperatures to measured values. In this work, the factor is not required. Using the 1D model, the Mandl et al. 16.6 kW gasifier was scaled to 9.5 MW input; the 89% cold-gas efficiency, observed at 16.6 kW input, decreases only slightly to 84% at the 9.5 MW scale.

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“…Biomass is a green fuel that is readily available globally, potentially accounting for 14–15% of overall energy consumption. 1 Biomass is also a cleaner fuel characterized by reduced sulfur, nitrogen, and carbon dioxide emissions. 2 In addition, it is of low cost and readily available in different forms, including agricultural residuals, wood, and energy crops.…”

Section: Introductionmentioning

confidence: 99%

“…The optimization of these factors can significantly improve gasification efficiency (GE), thereby providing higher gas yield. 32 Some researchers have previously studied SCW gasification parameters; these include: (i) SCW gasification of eucalyptus chips at temperatures between 400 and 500 °C, pressures ranging from 20–22, 22–25 to 25–30 MPa, and various residence time (30, 45, or 60 min); 29 (ii) examination of the gasification mechanism of cornstalk in SCW at temperatures between 500–800 °C, residence time between 1 and 15 min, and feed concentration of 1–9 wt %; 1 (iii) production of H 2 -rich gas from gasification of unsorted food waste in SCW at temperatures between 420 and 480 °C, residence time of 30–75 min, and feed concentration of 5–15 wt %; (iv) investigation of in situ SCW gasification of sugarcane bagasse at different temperatures (300, 350, 400, 450, and 500), biomass ratios (0.125, 0.167, 0.25, and 0.5), and a constant residence time of 50 min; 27 and finally (v) gasification of RH in SCW at temperatures between 400 and 680 °C, a biomass concentration between 2 and 14 wt %, a biomass particle size ranging from 250 to 1500 μm and a constant residence time of 1 h.…”

Section: Introductionmentioning

confidence: 99%

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Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

et al. 2021

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In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350–500 °C), residence time (30–120 min), and feed concentration (3–10 wt %) was experimentally studied using the response surface methodology in relation to the yield of gasification products. The quadratic models have been suggested for both responses. Based on the models, the quantitative relationship between various operational conditions and the responses will reliably forecast the experimental outcomes. The findings revealed that higher temperatures, longer residence times, and lower feed concentrations favored high gas yields. The lowest tar yield obtained was 2.98 wt %, while the highest gasification efficiency and gas volume attained were 64.27% and 423 mL/g, respectively. The ANOVA test showed that the order of the effects of the factors on all responses except gravimetric tar yield follows temperature > feed concentration > residence time. The gravimetric tar yield followed a different trend: temperature > residence time > feed concentration. The results revealed that SCW gasification could provide an effective mechanism for transforming the energy content of RH into a substantial fuel product.

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Study on gasification mechanism of biomass waste in supercritical water based on product distribution

Cited by 40 publications

References 53 publications

Main Hydrogen Production Processes: An Overview

Main Hydrogen Production Processes: An Overview

On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

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