Comparative investigation on thermal decomposition of powdered and pelletized biomasses: Thermal conversion characteristics and apparent kinetics

Gaofei, Guo; Zhang, Ke; Liu, Chaoxian; Xie, Shenglin; Li, Xu; Li, Bin; Junsheng, Shu; Niu, Yong; Zhu, Huabing; Meizhou, Ding; Zhu, Wenkui

doi:10.1016/j.biortech.2020.122732

Cited by 26 publications

(6 citation statements)

References 48 publications

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“…This results clearly marked that densification is capable of facilitating syngas formation from biomass gasification, and this phenomenon is qualitatively in-line with the results obtained from Aydin et al [13]. Moreover, this is due to the fact that the pelletization process of the SWP reduce the moisture content of the SW making the biomass structure regularly and enhance the gasification process much more stable as compared to the powdered SW and SBCoal [31]. The irregular shape and powdered SW and SBCoal are difficult to handle as it is easier to disperse to the atmosphere especially during the loading stage.…”

Section: Syngas Compositionsupporting

confidence: 89%

Gasification performance of sawdust, pelletized sawdust and sub-bituminous coal in a downdraft gasifier

et al. 2020

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The paper is an experimental study of the gasification process of sawdust (SW), sawdust pellet (SWP) and sub-bituminous coal (SBCoal) by using downdraft gasifier. The gasification was undertaken in a lab-scale fixed-bed gasifier operating under air as an oxidizing agent. The comparison on the raw biomass, treated biomass and coal was assessed in term of the product gas and gasification performance at a fixed condition of gasification temperature of 750 °C and equivalence ratio of 0.25. The gasification performance was tabulated in the form of calorific value of the syngas (HHV syngas ), gasification efficiency (X CGE ) and carbon conversion efficiency (X C ). It was denoted that SWP produces the highest H 2 and the lowest CO 2 . Furthermore, SBCoal possesses the highest gasification performance among the three feedstocks. Besides, the influence of the temperature between SW, SWP and SBCoal was evaluated at the equivalence ratio of 0.25. The findings demonstrate that rising the temperature, H 2 and CO for SW, SWP and SBCoal are increase. The volume of the CO 2 is constant as the temperature increases. In contrast, the CH 4 decreases with increase in the gasification temperature. As the gasification temperature increases, HHV syngas and X CGE of SW and SWP are increasing; meanwhile, SBCoal shows the opposite results. Simultaneously with rising gasification temperature, the X C 's of the SW, SWP and SBCoal are increasing.

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Section: Syngas Compositionsupporting

confidence: 89%

Gasification performance of sawdust, pelletized sawdust and sub-bituminous coal in a downdraft gasifier

et al. 2020

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“…The mass loss in Stage III can be higher if the final temperature of pyrolysis is increased. In addition, the weight loss percentage at each stage on RRHP pyrolysis at 10 K/min was also in a good agreement with the results obtained by Guo et al (2020). Also shown in Table 3, the final residue of the catalyzed pyrolysis of ARH20P was higher than that of the uncatalyzed pyrolysis of RRHP, possibly affected by the addition of the fairly high weight of the catalyst.…”

Section: Tg and Dtg Curvessupporting

confidence: 86%

Thermogravimetric Analysis and Kinetic Study on Catalytic Pyrolysis of Rice Husk Pellet using Its Ash as a Low-cost In-situ Catalyst

Wibowo

Cahyono

Rochmadi

et al. 2021

Int. J. Renew. Energy Dev.

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The thermogravimetric behaviors and the kinetic parameters of uncatalyzed and catalyzed pyrolysis processes of a mixture of powdered raw rice husk (RRH) and its ash (RHA) in the form of pellets were determined by thermogravimetric analysis at three different heating rates, i.e., 5, 10, and 20 K/min, from 303 to 873 K. This research aimed to prove that the rice husk ash has a catalytic effect on rice husk pyrolysis. To investigate the catalytic effect of RHA, rice husk pellets (RHP) with the weight ratio of RRH:ARH of 10:2 were used as the sample. Model-free methods, namely Friedman (FR), Kissinger-Akahira-Sunose (KAS), and Flynn-Wall-Ozawa (FWO), were used to calculate the apparent energy of activation ( ). The thermogravimetric analysis showed that the decomposition of RHP in a nitrogen atmosphere could be divided into three stages: drying stage (303-443 K), the rapid decomposition stage (443-703 K), and the slow decomposition stage (703-873 K). The weight loss percentages of each stage for both uncatalyzed and catalyzed pyrolysis of RHP were 2.4-5.7%, 35.5-59.4%, and 2.9-12.2%, respectively. Using the FR, FWO, and KAS methods, the values of for the degrees of conversion (a) of 0.1 to 0.65 were in the range of 168-256 kJ/mol for the uncatalyzed pyrolysis and 97-204 kJ/mol for the catalyzed one. We found that the catalyzed pyrolysis led the to have values lower than those got by the uncatalyzed one. This phenomenon might prove that RHA has a catalytic effect on RHP pyrolysis by lowering the energy of activation.

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“…The analysis of the chemical components of the ash enabled identifying metals and oxides already described in the literature. Caustic alkalis and oxides of Ca, Mg, K, and P are directly related to an increase in pH (Guo, et al, 2020;Wons, et al, 2018). Thus, the material with these components had several potential uses such as in changing low pH characteristics for acidic soil improvement (Shi, et al, 2016).…”

Section: Ash Characterizationmentioning

confidence: 99%

Biomass in an industrial boiler: characterizing and reducing waste from the burning process

Hansted

Tomeleri

et al. 2022

RSD

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Ashes constitute a waste produced in the heat generation process from bioenergy. This study aimed to improve the biomass energy efficiency used in an industrial boiler. The physicochemical analysis was used to perform improvement in the quality of the biomass for solid fuel. Four biomass types (eucalyptus bark, wood chips, sawdust, and recycled wood waste) were analyzed. The material (ash) was collected every two months over one year. All samples were characterized regarding proximate analysis, chemical composition (macro and micronutrients), morphological characterization (via scanning electron microscopy [SEM] coupled with dispersive energy spectroscopy [EDS]), and particle size distribution. The four biomass types presented significant differences in moisture content and proximate analysis. The bark showed a high percentage of impurities with an ash content of 26.99%. It was possible to reduce the ash content of the biomass inserted into the boiler in half, by separating the bark in the granulometric strata and excluding the smallest particle size (<0.84 mm). The results regarding the ashes showed that chemical composition and physical attributes were similar in all samples over the year. The chemical components were the same, although they varied in quantity. It is possible to improve the biomass energetic performance by excluding the smallest particles prior to the boiler insertion.

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Comparative investigation on thermal decomposition of powdered and pelletized biomasses: Thermal conversion characteristics and apparent kinetics

Cited by 26 publications

References 48 publications

Gasification performance of sawdust, pelletized sawdust and sub-bituminous coal in a downdraft gasifier

Gasification performance of sawdust, pelletized sawdust and sub-bituminous coal in a downdraft gasifier

Thermogravimetric Analysis and Kinetic Study on Catalytic Pyrolysis of Rice Husk Pellet using Its Ash as a Low-cost In-situ Catalyst

Biomass in an industrial boiler: characterizing and reducing waste from the burning process

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