Numerical Modelling of Fluidized Bed Gasification: An Overview

Gupta, Saurabh; Bhaskaran, Sminu; De, Santanu

doi:10.1007/978-981-10-7335-9_10

Cited by 4 publications

(10 citation statements)

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“…In this approach, it is assumed that a fixed fraction of water initially contained in the feedstock is evaporated. The produced vapor is directly added to the other gas components, without the use of kinetic models (Gupta & Bhaskaran, 2018). For example, in the study of Gerber et al (2010) it is assumed that 10% of the water contained in the feedstock is evaporated.…”

Section: Drying Stepmentioning

confidence: 99%

“…Finally, an isothermal evaporation process is used in a study by Gerber & Oevermann (2014). In this model, the evaporation process is described by a lumped method at a constant evaporation temperature (373K), where a certain amount of water is evaporated over a short time period (Gerber & Oevermann, 2014;Gupta & Bhaskaran, 2018). Since this process is usually very rapid, its kinetic is often neglected.…”

Section: Drying Stepmentioning

confidence: 99%

“…In the literature, pyrolysis fraction (f P ) and kinetic models are used to describe the mass loss. In the most simplified models, pyrolysis is assumed to occur instantaneously at the feeding location, along with the drying step (Gupta & Bhaskaran, 2018). In a study by Giltrap et al (2003), the pyrolysis fraction f P is introduced in order to represent the degree of devolatilization of an instantaneous pyrolysis process.…”

Section: Pyrolysis Stepmentioning

confidence: 99%

“…Devolatilization process described by a kinetic model is shown in Eq. 2, where m 0 , m ∞ , X and ω represent the feedstock mass at t=0 (kg), the feedstock mass at t=∞ (kg), the extent of conversion and the order of reaction, respectively (Grammelis et al, 2009;Gupta & Bhaskaran, 2018). The reaction rate constant is expressed by the Arrhenius reaction rate.…”

Section: Pyrolysis Stepmentioning

confidence: 99%

“…(2) Several pyrolysis kinetic models exist, such as the onestep global model, the one-stage multi-reaction model and the two-stage semi-global model (Gupta & Bhaskaran, 2018;. These pyrolysis models are presented in Table 1, where n represents the number of moles and K p represents the kinetic rate constant (Di Blasi, 2000;Gupta & Bhaskaran, 2018;). In the onestep global model, pyrolysis is considered as a single-step reaction, where volatiles, tar and char are produced simultaneously (Gupta & Bhaskaran, 2018).…”

Section: Pyrolysis Stepmentioning

confidence: 99%

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Development of a MSW Gasification Model for Flexible Integration Into a Mfa-Lca Framework

et al. 2018

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This paper presents the development of a comprehensive gasification module designed to be integrated in a MFA-LCA framework. From existing gasification models present in the literature, the most appropriate modelling strategy is selected and implemented into the module. This module needs to be able to capture the influence of input parameters, such as gasification reactor type, oxidizing agent, feedstock composition and operating conditions on the process outputs, including syngas yield, its composition and LHV, as well as tar and char contents. A typical gasification process is usually modelled in four steps: drying, pyrolysis, oxidation and reduction. Models representing each of these steps are presented in this paper. Since the type of gasification reactor is taken into account in the module, models for downdraft moving bed and bubbling fluidized bed reactor are also reviewed. The gasification module will be integrated into a MFA framework (VMR-Sys), which enables calculation of relevant gasifier feedstock parameters, such as moisture content, composition, properties and particle size distribution. Outputs from the module will also include elemental compositions obtained from VMR-Sys calculations. Finally, all outputs from the module will be used to build LCA-inventory data.

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Section: Drying Stepmentioning

confidence: 99%