A review of recent studies of the CFD modelling of coal gasification in entrained flow gasifiers, covering devolatilization, gas-phase reactions, surface reactions, models and kinetics

Mularski, Jakub; Pawlak–Kruczek, Halina; Modliński, Norbert

doi:10.1016/j.fuel.2020.117620

Cited by 70 publications

(31 citation statements)

References 214 publications

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“…Pyrolysis is one of the stages of a gasification process [31,33,38]. Therefore, a pyrolysis zone can be distinguished in all types of fixed bed gasifiers [31,33].…”

Section: Pyrolysis and Gasification Experiments Using Isothermal Furnacementioning

confidence: 99%

“…In case of the fixed bed gasifiers, it is often referred to as flaming pyrolysis [31,37] as the heat for the pyrolysis is obtained from the combustion of the pyrolytic gases. Extensive amount of work has been done so far on numerical modelling of the gasification in the entrained flow reactors, working with coal [38]. Much less work was dedicated to gasification of biomass [39], although the existence of an extensive amount of pyrolysis kinetics data, using a multitude of different models shall not be overlooked [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

et al. 2020

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Gasification of biomass in fixed bed gasifiers is a well-known technology, with its origins dating back to the beginning of 20th century. It is a technology with good prospects, in terms of small scale, decentralized power co-generation. However, the understanding of the process is still not fully developed. Therefore, assessment of the changes in the design of a gasifier is typically performed with extensive prototyping stage, thus introducing significant cost. This study presents experimental results of gasification of a single pellet and bed of particles of raw and torrefied wood. The procedure can be used for obtaining design parameters of a fixed bed gasifier. Results of two suits of experiments, namely pyrolysis and CO2 gasification are presented. Moreover, results of pyrolysis of pellets are compared against a numerical model, developed for thermally thick particles. Pyrolysis time, predicted by model, was in good agreement with experimental results, despite some differences in the time when half of the initial mass was converted. Conversion times for CO2 gasification were much longer, despite higher temperature of the process, indicating importance of the reduction reactions. Overall, the obtained results could be helpful in developing a complete model of gasification of thermally thick particles in a fixed bed.

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“…Pyrolysis is one of the stages of a gasification process [31,33,38]. Therefore, a pyrolysis zone can be distinguished in all types of fixed bed gasifiers [31,33].…”

Section: Pyrolysis and Gasification Experiments Using Isothermal Furnacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

et al. 2020

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“…Here, m C -mass of carbon in the sample, S r -area of reactive surface, m 2 ; C CO2concentration of carbon dioxide in gas flow. Equation ( 1) is often used in modeling solid fuel gasification processes [54]. The dependence of the reaction area on the sample mass is determined by the geometric parameters of the particles; in general, it is possible to assume the formula S r /S 0 = (m C /m 0 ) n .…”

Section: Kinetic Models For Processing Tg Curvesmentioning

confidence: 99%

“…Therefore, the main kinetic characteristic for comparing different models is the activation energy. As is known from published research data, the average activation energy is of the order of 200 kJ mol −1 [54,57,58]. Therefore, the gasification regime of samples under thermal analysis conditions can be identified by the proximity of the apparent activation energy to the anticipated value.…”

Section: Kinetic Models For Processing Tg Curvesmentioning

confidence: 99%

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Donskoy¹,

Козлов²

2021

Energies

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This study presents experimental studies of charcoal gasification with CO2 at different heating rates (1, 5, 10, 20, and 50 K min−1). The kinetics of the reaction C + CO2 under pore-diffusion control is studied. We propose a new method for the proper determination of activation energy during the processing of thermogravimetric curves of porous carbon gasification under conditions of pore-diffusion resistance. The results of the inverse kinetic problem solution are compared with different hypotheses about the regime of the investigated heterogeneous reaction process (kinetic, diffusion, pore-diffusion). The change of reaction regimes from kinetic to diffusion is detected during charcoal gasification at different heating rates. At heating rates of 5–20 K min−1, the values of activation energy of carbon gasification reaction in the carbon dioxide atmosphere, obtained by the proposed method, closely match the data found in the previous studies. The use of diffusion models in the processing of thermogravimetric curves determines the conditions under which conventional kinetic models fail to provide adequate information about the temperature dependence of the heterogeneous reaction rate.

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“…Although there is a tendency to classify gasification processes according to the calorific value of the gas produced, it is also possible and more likely to classify according to the reactor type used in the gasification process. Gasification is mainly carried out in three types of reactors: fixed bed gasifiers, fluidized bed gasifiers, and entrained flow bed gasifiers [26,40].…”

Section: Introductionmentioning

confidence: 99%

Çan Kömürü Gazlaştırılmasının Sürüklemeli Akış Gazlaştırıcıda Aspen PLUS® Kullanılarak İncelenmesi

Kartal¹,

Cingisiz²,

Özveren³

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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Excessive consumption of fossil fuels due to energy demand leads to an increase in the amount of CO2 emitted to the environment. Gasification technology enables clean and efficient use of fossil fuels such as coal, which cause CO2 emissions predominantly. Gasification can be utilized under several atmospheres such as air, steam, O2/CO2 mixture, etc. The reduction of inert gases (N2) and the increase of CO concentration at high temperatures in syngas provides high-quality gas. Among the commercial gasifiers, entrained flow gasifiers have many advantages such as obtaining tar-free synthesis gas, high carbon conversion efficiency, and production in high capacities. In addition, there is no limitation to the type of coal to be used. The performance of the entrained flow gasifiers can be examined by simulation programs and design optimization can be performed at a low cost. This study aims to develop a new entrained flow gasifier model for Turkish Lignite (Çan coal) using the Aspen Plus ® thermodynamic simulation program and the effects of various parameters on the synthesis gas were investigated by sensitivity analysis.

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A review of recent studies of the CFD modelling of coal gasification in entrained flow gasifiers, covering devolatilization, gas-phase reactions, surface reactions, models and kinetics

Cited by 70 publications

References 214 publications

Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

Thermogravimetric Study of the Kinetics of the Reaction C + CO2 under Pore-Diffusion Control

Çan Kömürü Gazlaştırılmasının Sürüklemeli Akış Gazlaştırıcıda Aspen PLUS® Kullanılarak İncelenmesi

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