Numerical study on entrained-flow gasification performance using combined slag model and experimental characterization of slag properties

Safronov, Dmitry; Förster, Thomas; Schwitalla, Daniel; Nikrityuk, Petr A.; Guhl, Stefan; Richter, Andreas; Meyer, Bernd

doi:10.1016/j.fuproc.2017.03.007

Cited by 41 publications

(15 citation statements)

References 50 publications

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“…The simpler model is likely what has been coded already into a large simulation of coal combustion or gasification and requires less computational time. The CPD model has been used to generate simple first-order rate expressions for a number of coals and heating conditions. − Zhang et al developed a one-step global reaction with six light gas product species using the CPD model. A similar one-step global reaction model was also used for fluidized bed coal combustion calculations. , Menage et al.…”

Section: Use Of the Cpd Model To Determine Rate Constants For Other P...mentioning

confidence: 99%

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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The chemical percolation devolatilization (CPD) model for coal pyrolysis was first published in 1989, and a completed version that included the vapor–liquid equilibrium model and cross-linking model was published in 1992. The CPD model was one of three pyrolysis models developed using a lattice model to account for the chemical structure of the coal and was directly based on solid-state 13C nuclear magnetic resonance (NMR) measurements of the coal structure. A correlation of coal structure parameters measured by NMR spectroscopy was performed to permit use of the CPD model to determine pyrolysis rates and yields of tars and light gases for any coal type. A separate nitrogen release model was also developed on the basis of the chemical structure. In the past 30 years, the CPD model or the concepts in the CPD model have been used to describe pyrolysis in many situations for many fuels. The CPD model has been incorporated directly into simulations of large coal combustors as well as detailed simulations of single-pyrolyzing or burning coal particles, which was the original intent. Some investigators added a more rigorous treatment of light gas release. Other investigators have used the CPD model to determine rate coefficients for simpler models for a given range of heating conditions. In addition, the concepts in the CPD model have been used to develop models for other solid fuels, including biomass, black liquor, oil shale, rigid foams, propellants, heavy oil, asphalt, and scrap tires. The CPD model has also been extended to low heating rates for underground coal thermal treatment and hydropyrolysis. This paper is a review of the development, improvement, and uses of the CPD model, along with extended uses of the concepts in the CPD model.

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Section: Use Of the Cpd Model To Determine Rate Constants For Other P...mentioning

confidence: 99%

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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“…During the entrained-flow gasifier operation, the refractory material has been overlaied a layer of solid and liquid slag to protect the wall so that syngas cannot radiate it and liquid slag cannot corrode it as well. At the meantime, the heat loss reduced, and the cooling efficiency improved [7]. Therefore, the study of the slag layer in gasifiers has become the direction for optimizing the coal gasification technology.…”

Section: Introductionmentioning

confidence: 99%

“…However, through the numerical simulation method, the state of the slag layer during the gasifier's operation can be simulated. Today's preferred numerical simulation method is computational fluid dynamics (CFD), which combined with detailed sub-models of the various physical and chemical processes in the gasifier [7].…”

Section: Introductionmentioning

confidence: 99%

“…Seggiani [6] proposed a model that assumed that the whole slag layer (solid and liquid) was linear to forecast the slag thickness and divided the gasifier into 15 units. Many vatiant models from the Seggiani model has been used in many modeling and CFD researches [2,7,11,12,14]. Bi et al [2] analyzed the behavior of slag accumulation and slag flow, established a carbon-conversion-based particle capture criterion, and used the average temperature on the thickness of the liquid slag by assuming a cubic temperature profile, which is better suited than the linear profile.…”

Section: Introductionmentioning

confidence: 99%

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Model Development and Numerical Investigation of the Slag Formation in an Entrained-Flow Gasifier

Jiang

Zhou²,

Ge³

et al. 2023

J. Phys.: Conf. Ser.

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Understanding the formation and the flow of molten slag in the water-cooled membrane wall pulverized coal entrained flow gasifier was very important to determine the wall heat transfer and the reactor operation. In the standard model’s CFD simulation, the wall boundary condition was only able to be set as a fixed heat flow, which was not accurate in describing the influence of the temperature distribution and slag distribution on heat transfer under the actual situation. In this work, an extensive and detailed slag model was established and validated. The complete slag model included a particle capture model, wall heat transfer model, and slag thickness model through real-time coupling with CFD. Particle capture criteria were discussed and used to decide the particle behavior if particles collide on the reactor wall. The slag flow model was established from this criterion to calculate the mass flow rate and the thickness of the liquid slag. The slag thickness model calculated the heat transfer at each wall location, and the coupled temperature, slag thickness, and heat transfer curves were finally obtained through iteration. The models were proved reliable by comparing the simulation with industrial results. The model predicted the slag thickness of liquid and solid slags, the wall temperature, and the heat flux through the wall. The model’s establishment further understood the slag formation, slag thickness distribution, and wall temperature distribution. It also played a guiding function in industrial operations.

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“…Gomez-Barea and Leckner [10] reviewed the fluidized-bed technology, Higman [11] reviewed the entrained-flow gasifiers, while Chopra and Jain [12] reviewed fixed-bed technology. The most recent developments in Germany include bioliq entrained-flow technology [13,14] and TU Freiberg entrained-flow gasifier [15].…”

Section: Introduction and Objectivesmentioning

confidence: 99%

On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets

et al. 2021

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The subject of this work is the mathematical modelling of a counter-current moving-bed gasifier fuelled by wood-pellets. Two versions of the model have been developed: the one-dimensional (1D) version-solving a set of Ordinary Differential Equations along the gasifier height-and the three-dimensional (3D) version where the balanced equations are solved using Computational Fluid Dynamics. Unique procedures have been developed to provide unconditionally stable solutions and remove difficulties occurring by using conventional numerical methods for modelling counter-current reactors.The procedures reduce the uncertainties introduced by other mathematical approaches, and they open up the possibility of straightforward application to more complex software, including commercial CFD packages. Previous models of Hobbs et al., Di Blasi and Mandl et al. used a correction factor to tune calculated temperatures to measured values. In this work, the factor is not required. Using the 1D model, the Mandl et al. 16.6 kW gasifier was scaled to 9.5 MW input; the 89% cold-gas efficiency, observed at 16.6 kW input, decreases only slightly to 84% at the 9.5 MW scale.

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Numerical study on entrained-flow gasification performance using combined slag model and experimental characterization of slag properties

Cited by 41 publications

References 50 publications

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Model Development and Numerical Investigation of the Slag Formation in an Entrained-Flow Gasifier

On the Mathematical Modelling of a Moving-Bed Counter-Current Gasifier Fuelled with Wood-Pellets

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