Equilibrium modeling of gasification: a free energy minimization approach and its application to a circulating fluidized bed coal gasifier

Li, X; Grace, John R.; Watkinson, A. P.; Lim, C. Jim; Ergüdenler, A.

doi:10.1016/s0016-2361(00)00074-0

Cited by 300 publications

(157 citation statements)

References 20 publications

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“…Presented model is based on the Gibbs minimization method, which is well known and widely used to modeling complex processes such as gasification [11][12][13][14]. In this study…”

Section: Model Developmentmentioning

confidence: 99%

Simulation analysis of wastes gasification technologies

Stępień

Ściążko²,

Czerski

et al. 2017

E3S Web Conf.

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Abstract. Each year a significant growth in the amount of wastes generated is observed. Due to this fact technologies enabling utilization of wastes are needed. One of the ways to utilizes wastes is thermal conversion. Most widely used technology for thermal conversion is gasification that enables to produce syngas that can be either combusted or directed to further synthesis to produce methanol or liquid fuels. There are several commercially available technologies that enable to gasify wastes. The first part of this study is subjected to general description of waste gasification process. Furthermore the analysis and comparison of commercially available gasification technologies is presented, including their process arrangement, limits and capabilities. Second part of the study is dedicated to the development of thermodynamic model for waste gasification. The model includes three zones of gasification reactors: drying, gasification and eventually ash melting. Modified Gibbs minimization method is used to simulate gasification process. The model is capable of predicting final gas composition as a function of temperature or equivalence ratio. Calculations are performed for a specified average wastes composition and different equivalence ratios of air to discuss its influence on the performance of gasification (temperature of the process and gas composition). Finally the model enables to calculate total energy balance of the process as well as gasification and final gas temperature.

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“…Presented model is based on the Gibbs minimization method, which is well known and widely used to modeling complex processes such as gasification [11][12][13][14]. In this study…”

Section: Model Developmentmentioning

confidence: 99%

Simulation analysis of wastes gasification technologies

Stępień

Ściążko²,

Czerski

et al. 2017

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…There are two types of phenomenological models for gasification systems, based on either a kinetic approach or an equilibrium approach (Li et al, 2001). Kinetic models are able to predict the behavior of gasification systems in more details; however, they require the knowledge of kinetic parameters (ranging from a few to thousands), which are typically obtained experimentally.…”

Section: Thermodynamic Equilibrium Modelingmentioning

confidence: 99%

Evaluation of Biomass and Coal Co-Gasification of Brazilian Feedstock Using a Chemical Equilibrium Model

Rodrigues

Muniz

Marcílio

2016

Braz. J. Chem. Eng.

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-Coal and biomass are energy sources with great potential for use in Brazil. Coal-biomass cogasification enables the combination of the positive characteristics of each fuel, besides leading to a cleaner use of coal. The present study evaluates the potential of co-gasification of binary coal-biomass blends using sources widely available in Brazil. This analysis employs computational simulations using a reliable thermodynamic equilibrium model. Favorable operational conditions at high temperatures are determined in order to obtain gaseous products suitable for energy cogeneration and chemical synthesis. This study shows that blends with biomass ratios of 5% and equivalence ratios ≤ 0.3 lead to high cold gas efficiencies. Suitable gaseous products for chemical synthesis were identified at biomass ratios ≤ 35% and moisture contents ≥ 40%. Formation of undesirable nitrogen and sulfur compounds was also analyzed.

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“…The reactions during gasification reached equilibrium. Therefore, the gas composition during gasification was determined by minimization of the Gibbs energy of the products and reactants (Jarungthammachote and Dutta, 2008;Nikoo and Mahinpey, 2008;Li et al, 2001;Melgar et al, 2007). 5.…”

Section: Aspen Plus Model Developmentmentioning

confidence: 99%