CFD simulation of entrained-flow coal gasification: Coal particle density/sizefraction effects

Slezak, Andrew; Kuhlman, John M.; Shadle, Lawrence J.; Spenik, James; Shi, Shaoping

doi:10.1016/j.powtec.2010.03.029

Cited by 103 publications

(59 citation statements)

References 16 publications

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“…Some progress has been made towards predicting ash deposition and slag thickness in the gasifier [117][118][119][120]. However, their utility is very limited owing to lack of understanding of ash formation mechanisms and ash deposition mechanisms.…”

Section: Foulingmentioning

confidence: 99%

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Krishnamoorthy

Pisupati

2015

Energies

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Gasification of coal is gaining more popularity due to its clean operation, and its ability to generate products for various markets. However, these technologies are not widely commercialized due to reliability and economic issues. Mineral matter in coal plays an important role in affecting the availability/reliability of a gasifier. Agglomeration in the bed, slag mobility and blockage of the syngas exit section are some of the operations related concerns in fixed-bed gasifiers, while ash deposition and sudden defluidization are the major concerns in fluidized bed gasifiers. In the case of entrained flow gasifiers, syngas cooler fouling and blockage, corrosion and erosion of refractory, and slag mobility are some of the major issues affecting the operations and the reliability of the gasifier. This review is aimed at critically examining various mineral matter related issues contributing to the operation and reliability problems in three types of generic gasifiers (fixed bed, fluidized bed and entrained flow gasifiers). Based on the review, some strategies to counter the potential mineral matter related issues are presented.

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Section: Foulingmentioning

confidence: 99%

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Krishnamoorthy

Pisupati

2015

Energies

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“…The dimensions of the gasifier are based on the GEE-Texaco gasifier. 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%

Development of a hybrid shrinking‐core shrinking‐particle model for entrained‐flow gasifiers

et al. 2015

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in Wiley Online Library (wileyonlinelibrary.com) Slagging entrained-flow gasifiers operate above the melting temperature of the ash. As slag is highly nonwetting on the surface of char (carbon) particles, it is likely that it will agglomerate into one or several slag droplets and some of these droplets can detach from the char particles. If the slag exists in the form of droplets on the char surface rather than as a solid shell around the unreacted char particle, a shrinking particle model would be more physically realistic representation in comparison to the widely used shrinking core model (SCM). In the early section of the gasifier, the temperature remains below the ash melting temperature and, therefore, the SCM is more appropriate in this region. With this motivation, a novel hybrid shrinking-core shrinking-particle model has been developed. The model provides spatial profile of a number of important variables that are not available from the traditional SCM.

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“…Char particles impinging on the wall slag layer can either be entrapped inside the melt, or adhere onto the slag layer's surface. The first scenario is unlikely to occur, on the basis of forces and energy balances governing char/slag interaction [7,11], along with particle impact velocities and trajectories throughout the gasifier [12]. On the other hand, if particles adhere onto the slag layer's surface, further carbon conversion is possible.…”

Section: Introductionmentioning

confidence: 99%

Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

Troiano

Solimene

Salatino

et al. 2016

Fuel Processing Technology

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CFD simulation of entrained-flow coal gasification: Coal particle density/sizefraction effects

Cited by 103 publications

References 16 publications

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Development of a hybrid shrinking‐core shrinking‐particle model for entrained‐flow gasifiers

Multiphase flow patterns in entrained-flow slagging gasifiers: Physical modelling of particle–wall impact at near-ambient conditions

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