Migration and transformation behaviours of ash residues from a typical fixed-bed gasification station for biomass syngas production in China

Yao, Xiwen; Zhao, Zhicheng; Chen, Shoukun; Zhou, Haodong; Xu, Kaili

doi:10.1016/j.energy.2020.117646

Cited by 52 publications

(16 citation statements)

References 42 publications

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“…When the temperature exceeds 1000 °C, the ash yields recover the apparent downward trend. A similar trend was also observed in the study of Yao et al 29 They considered that the weight loss was assigned to the oxidation of unburned and encapsulated char because at such high temperatures the melting of ash allowed oxygen diffusion. However, in this study, the huge weight loss is only attributed to the ash escape.…”

Section: Resultssupporting

confidence: 82%

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Song

2021

ACS Omega

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It is crucial to accurately evaluate the slagging characteristics of coal before industrial application. However, when evaluating the Xinjiang high-sodium low-rank coal (XJc) according to the properties of the ash prepared at 815 °C, the ashing temperature of the coal sample specified by Chinese standards, forecasting failures are frequent. To figure out the internal reason, the influence of ashing temperature on predicting slagging characteristics of XJc was investigated via an ashing test and thermodynamic equilibrium calculation. Experimental results show that when XJc is ashed at 815 °C, the ash yield apparently reduces compared to the case when ashed at 500 °C since numerous volatile components are released. The release of these components contributes to an obvious inhibition in the formation of the liquid phase in the residual ash, especially at temperatures below 1200 °C. Hence, reducing the ashing temperature is conducive to the acquirement of more real ash compositions of XJc and thereby to the accurate prediction of the slagging behaviors. By a comparison with reported experimental results, it is found that the liquid ratio–temperature curve calculated from the ash compositions of the ash prepared at 500 °C basically reflects the actual slagging tendency of XJc. According to the evolution of minerals with temperature, two slagging mechanisms, self-fusion of sodium-bearing salts and low-temperature eutectics, are confirmed. In addition, effects of antislagging measures of adding refractory oxides greatly differ among coal types due to the diversity in ash compositions.

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Section: Resultssupporting

confidence: 82%

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Song

2021

ACS Omega

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“…PU is widely used to replace diesel engine emission particles because of its similar physical and chemical properties to diesel engine emission particles. − It is well known that thermogravimetric analysis is a method to reflect the oxidation properties of substances, because the degree of weight loss during heat treatment can be represented by the TGA diagram. − The major properties of PU (Degussa GmbH, Frankfurt, Germany) employed in TGA tests are shown in Table . A fixed bed reactor is used to provide different aging conditions for PU and PU/catalyst/ash mixtures, and its main parameters are shown in Table .…”

Section: Description Of Experimentsmentioning

confidence: 99%

Effect of Different Aging Conditions on the Soot Oxidation by Thermogravimetric Analysis

et al. 2020

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Diesel particulate filter is an effective device to reduce diesel particulate emission. The particles in diesel particulate filter are usually affected by the aging of high-temperature exhaust gas before the regeneration process. In order to investigate the effect of aging conditions on the soot oxidation process, the effect of aging temperature and aging time on the oxidation process of carbon black (Printex-U, PU) and the PU/catalyst/ash mixture are studied by thermogravimetric analysis. The aging PU particles have lower starting temperature, peaking temperature, ending temperature, and activation energy. Compared with the particles without aging, the PU particles with a 400 °C aging temperature and 20 h aging time are able to reduce the activation energy from 191.2 to 158 kJ/mol. Low aging temperatures (200–300 °C) and the catalyst have a certain synergistic effect on the improvement of PU oxidation activity. The PU/CeO2 mixture with a 300 °C aging temperature and 20 h aging time decreases the activation energy from 178.4 to the lowest 113.6 kJ/mol. The addition of CaSO4 in PU particles cannot stop the improvement of its oxidation activity by aging, but it reduces the effect of aging. This work is helpful to reveal the mechanism of aging on PU and the PU/catalyst/ash mixture in air environment.

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“…The biomass‐derived energy sources such as bio‐oil, biogas, and bio‐char have received more attention because of their advantages such as being renewable, low content of sulfur, and slight emission of carbon dioxide 4‐8 . However, it is well known that the gasification of biomass has also encountered severe ash‐related problems, such as bed agglomeration, deposit, and slag formation and corrosion 9 . Among the products of biomass conversion, hydrogen is one of the most important energetic and environmentally friendly fuels, which has received more attention due to its highest energy content among other common fuels 10‐15 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production via integrated configuration of steam gasification process of biomass and water‐gas shift reaction: Process simulation and optimization

Babatabar

Saidi

2021

Int J Energy Res

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Summary A comprehensive model is developed to predict and optimize the hydrogen production via integrated configuration of steam gasification process of biomass and water‐gas shift reaction by taking advantage of the ASPEN plus software and sensitivity analysis techniques. The steam gasification process of three different generations of biomass, including corn cob as the first generation, wood residue and rice husk as second generation, and Spirulina algae as the third, are investigated and evaluated to achieve maximum hydrogen production. This model is successfully validated with experimental data reported in the literature about steam gasification of rice husk in the fluidized bed reactor. The impact of main operating parameters is considered in terms of products composition, hydrogen yield, CO conversion, H2/CO ratio in the gas products stream, and cold gas efficiency (CGE). The results indicated that the maximum hydrogen concentration is achieved at the highest steam to biomass (S/B) ratio in the gasifier and water‐gas shift (WGS) reactor and at the lowest WGS reaction temperature, whereas there is an optimum value about the gasification temperature. The highest CO conversion and H2/CO molar ratio belong to rice husk biomass at all considered range of temperature, whereas they are almost the same for wood residue and Spirulina. The predicted results confirmed that CGE of all feedstocks improves with increasing gasification temperatures and S/B ratio. The steam gasification performance of different feedstocks at 750°C is ranked as wood residue (83.56%) > spirulina (83.47%) > corn cob (74.94%) > rice husk (69.86%). The presented configuration can be applied as a novel approach for process evaluation and optimization through the downdraft biomass gasification integrated with water‐gas shift reaction to intensify the hydrogen production.

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Migration and transformation behaviours of ash residues from a typical fixed-bed gasification station for biomass syngas production in China

Cited by 52 publications

References 42 publications

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Effect of Different Aging Conditions on the Soot Oxidation by Thermogravimetric Analysis

Hydrogen production via integrated configuration of steam gasification process of biomass and water‐gas shift reaction: Process simulation and optimization

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