2014
DOI: 10.1021/ef5010122
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One-Dimensional Dynamic Modeling of a Single-Stage Downward-Firing Entrained-Flow Coal Gasifier

Abstract: In the current paper, a one-dimensional partial differential equation (PDE)-based dynamic model and its simulation results are presented for a single-stage down-fired entrained-flow gasifier. The gasifier model comprises mass, momentum, and energy balances for the gas and solid phases. The initial gasification processes of water evaporation and coal devolatilization and the key heterogeneous and homogeneous chemical reactions have also been modeled. The resulting coupled system of PDEs and algebraic equations … Show more

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Cited by 12 publications
(19 citation statements)
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“…It is a significant future challenge to construct dynamic models of all of the relevant process units in sufficient detail such that the complex interaction between tightly integrated process sections can be understood well enough such that information about the time required for transitions, feasible turndown ratios, off-spec products, and their associated costs can be known. Some progress has been made in constructing dynamic models of certain individual process units specifically for the purposes of flexible polygeneration applications, such as for gasification [31], steam reforming [32], water gas shift [33], CO2 capture [34], and solid oxide fuel cells [35]. However, combining these models into one system requires considerable effort and has not yet been achieved.…”
Section: Discussionmentioning
confidence: 99%
“…It is a significant future challenge to construct dynamic models of all of the relevant process units in sufficient detail such that the complex interaction between tightly integrated process sections can be understood well enough such that information about the time required for transitions, feasible turndown ratios, off-spec products, and their associated costs can be known. Some progress has been made in constructing dynamic models of certain individual process units specifically for the purposes of flexible polygeneration applications, such as for gasification [31], steam reforming [32], water gas shift [33], CO2 capture [34], and solid oxide fuel cells [35]. However, combining these models into one system requires considerable effort and has not yet been achieved.…”
Section: Discussionmentioning
confidence: 99%
“…22 These include the gas composition and carbon conversion data compared for different stoichiometric conditions. The second validation was made using four different coal types available in Kasule et al 20,21 In their work, the effect of coal properties on the product species profile was numerically studied. Information on the proximate and elemental composition of coal is listed in Table 2.…”
Section: Model Validationmentioning
confidence: 99%
“…[18][19][20][21] Some used a linear variation of wall temperature, 18,19,22 while wall temperature has been calculated together with gas/solid temperature. 20,21 While a 1D reactor model was described to predict entrained flow gasifier performance along the reactor, 22 the scope of that study was limited to examining the influences of oxygen and steam supply rate on carbon conversion, gas composition, and temperature. Even with 1D models, most previous studies did not report the isolated influence of particle size and coal feeding rate except few studies, 10,18 but both factors have considerable influence on the kinetics of the gasification process.…”
Section: Introductionmentioning
confidence: 99%
“…The shrinking-core model used in this work has been previously presented by Kasule et al 10,30 and is used for the early region of the gasifier where the bulk temperature is below the ash melting temperature. Details of that model can be found in the work of Kasule et al It should be noted that in entrainedflow gasifiers, burners are designed to promote swirling motion close to the inlet of the gasifier that results in quick evaporation of water and the subsequent devolatilization step.…”
Section: Background and Descriptionmentioning
confidence: 99%
“…31 A rigorous model for the heat balance on the gasifier wall is also considered. Gas recirculation is also modeled, similar to the SCM, 10,30 to mimic the swirling effect produced by the burners.…”
Section: Background and Descriptionmentioning
confidence: 99%