Pyrolysis characteristics and kinetics of Indian low rank coal using thermogravimetric analysis

Dwivedi, Krishna Kant; Chatterjee, Pradip K.; Karmakar, Malay; Pramanick, Achintya Kumar

doi:10.1007/s40789-019-0236-7

Cited by 28 publications

(9 citation statements)

References 26 publications

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“…Pyrolysis is the primary step in the solid-fuel-conversion process, which plays a significant role during gasification. Depending on the organic properties and operating conditions, coal loses up to 70% of its mass under pyrolysis [90]. During pyrolysis, coal/biomass/MSW particles are fragmented due to breaking the weak bond between aromatic clusters.…”

Section: Pyrolysis Mechanism Of Solid Fuelsmentioning

confidence: 99%

Gasification of Solid Fuels (Coal, Biomass and MSW): Overview, Challenges and Mitigation Strategies

Shahabuddin

Alam

2022

Energies

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Currently, hydrogen energy is the most promising energy vector, while gasification is one of the major routes for its production. However, gasification suffers from various issues, including slower carbon conversion, poor syngas quality, lower heating value and higher emissions. Multiple factors affect gasification performance, such as the selection of gasifiers, feedstock’s physicochemical properties and operating conditions. In this review, the status of gasification, key gasifier technologies and the effect of solid-fuel (i.e., coal, biomass and MSW) properties on gasification performance are reviewed critically. Based on the current review, the co-gasification of coal, biomass and solid waste, along with a partial utilisation of CO2 as a reactant, are suggested. Furthermore, a technological breakthrough in carbon capture and sequestration is needed to make it industrially viable.

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Section: Pyrolysis Mechanism Of Solid Fuelsmentioning

confidence: 99%

Gasification of Solid Fuels (Coal, Biomass and MSW): Overview, Challenges and Mitigation Strategies

Shahabuddin

Alam

2022

Energies

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“…The difference in the results might be caused by the reaction kinetics used in the simulation is not suitable for LRC because most of the reaction kinetics obtained from literature was for HRC gasification instead of LRC [58]. Further improvement can be made to the O2 and CH4 composition results using CFD simulation by conducting a kinetic study specifically for the sample used instead of using the reaction kinetics available in the literature [59].…”

Section: Validation Of the Gasification Modelmentioning

confidence: 99%

Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method

Isa

Osman

Abdullah

et al. 2020

CFDL

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Low-Rank Coal (LRC) gasification utilising Fluidised Bed Gasifier (FBG) is more efficient for LRC that has higher reactivity, moisture, tar, volatile, and ash content but lower calorific value compared to other types of coals. This work investigated the application of Computational Fluid Dynamics (CFD) in simulating LRC gasification under different temperatures which is lower (873K), normal (973K) and higher (1073K) temperature atmosphere. Besides that, the effect of LRC type and gasifying agents on the producer gas CO+H2 composition, Lower Heating Value (LHV) and Cold Gas Efficiency (CGE) were also studied using High-rank Coal (HRC) as comparison. The results obtained showed that LRC gasification using oxygen increased LHV and CGE. Lower temperature gasification using oxygen at 873 increased CO+H2, LHV and CGE for LRC compared to higher temperatures at 973K and 1073K. This prediction suggests that LRC gasification using oxygen at lower temperature increases the LRC gasification efficiency.

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“…The experimental errors were within ± 2%. Gasification conversion (x) is calculated as (Dwivedi et al 2019):…”

Section: Gasification Testmentioning

confidence: 99%

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

Jiang

Meng

et al. 2020

Int J Coal Sci Technol

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This study examined an isothermal CO2 gasification of four chars prepared via two different methods, i.e., conventional and microwave-assisted pyrolysis, by the approach of thermogravimetric analysis. Physical, chemical, and structural behaviours of chars were examined using ultimate analysis, X-ray diffraction, and scanning electronic microscopy. Kinetic parameters were calculated by applying the shrinking unreacted core (SCM) and random pore (RPM) models. Moreover, char-CO2 gasification was further simulated by using Aspen Plus to investigate thermodynamic performances in terms of syngas composition and cold gas efficiency (CGE). The microwave-induced char has the largest C/H mass ratio and most ordered carbon structure, but the smallest gasification reactivity. Kinetic analysis indicates that the RPM is better for describing both gasification conversion and reaction rates of the studied chars, and the activation energies and pre-exponential factors varied in the range of 78.45–194.72 kJ/mol and 3.15–102,231.99 s−1, respectively. In addition, a compensation effect was noted during gasification. Finally, the microwave-derived char exhibits better thermodynamic performances than the conventional chars, with the highest CGE and CO molar concentration of 1.30% and 86.18%, respectively. Increasing the pyrolysis temperature, gasification temperature, and CO2-to-carbon molar ratio improved the CGE.

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Pyrolysis characteristics and kinetics of Indian low rank coal using thermogravimetric analysis

Cited by 28 publications

References 26 publications

Gasification of Solid Fuels (Coal, Biomass and MSW): Overview, Challenges and Mitigation Strategies

Gasification of Solid Fuels (Coal, Biomass and MSW): Overview, Challenges and Mitigation Strategies

Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

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