Numerical modeling of slag flow and heat transfer on the wall of an entrained coal gasifier

Ye, Insoo; Ryu, Changkook

doi:10.1016/j.fuel.2015.01.111

Cited by 52 publications

(11 citation statements)

References 20 publications

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“…With regard to the influence of low gas temperatures on the slag flow, it is worth reiterating the results from our previous study [21]. The gas temperature at the bottom cone of this gasifier is typically lower than at main body part where partially oxidative reactions of coal take place.…”

Section: Effects Of Gas Temperaturementioning

confidence: 53%

“…Equation (6) T cv changed from 1548 K to 1557 K (+10%) and 1538 K (−10%) Thermal conductivity of slag (k) Equation ( With regard to the slag properties, the viscosity, thermal conductivity, and emissivity were also varied from the reference conditions. The property submodels were also described in detail in our previous study [21]. The viscosity of the reference condition was estimated using the correlation of Kalmanovich and Frank [23] as follows: ) in the above equation was multiplied by 1.1 and 0.9 to vary the viscosity.…”

Section: Numerical Methods and Test Parametersmentioning

confidence: 99%

“…Our previous study [21] proposed a new numerical model to predict the flow and heat transfer of the slag layers, which can overcome the limitations of the analytical models of Seggani [22] and Yong et al [20]. This model solves the governing equations for the slag layers by using the finite volume method to predict the details of their thickness, temperature, and velocity distribution along the gasifier wall.…”

Section: Introductionmentioning

confidence: 99%

“…It consists of the main body, top cone and bottom cone. The bottom cone has a height of 0.30 m with a wall angle of 12°, leading to a slag tap with a radius of approximately 0.43 m. A numerical model for the slag flow and heat transfer in the gasifier was presented in detail in our previous study [21]. In brief, this model considers the following sets of governing equations for the mass (m), momentum (M) and energy (H) for a control volume within the liquid slag flow:…”

Section: Introductionmentioning

confidence: 99%

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Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

Ryu

2015

Energies

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Abstract:The behaviors of the slag layers formed by the deposition of molten ash onto the wall are important for the operation of entrained coal gasifiers. In this study, the effects of design/operation parameters and slag properties on the slag behaviors were assessed in a commercial coal gasifier using numerical modeling. The parameters influenced the slag behaviors through mechanisms interrelated to the heat transfer, temperature, velocity, and viscosity of the slag layers. The velocity profile of the liquid slag was less sensitive to the variations in the parameters. Therefore, the change in the liquid slag thickness was typically smaller than that of the solid slag. The gas temperature was the most influential factor, because of its dominant effect on the radiative heat transfer to the slag layer. The solid slag thickness exponentially increased with higher gas temperatures. The influence of the ash deposition rate was diminished by the high-velocity region developed near the liquid slag surface. The slag viscosity significantly influenced the solid slag thickness through the corresponding changes in the critical temperature and the temperature gradient (heat flux). For the bottom cone of the gasifier, steeper angles were favorable in reducing the thickness of the slag layers.

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Section: Effects Of Gas Temperaturementioning

confidence: 53%

Section: Numerical Methods and Test Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

Ryu

2015

Energies

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“…Slag deposition flux to the wall is difficult to model and a number of assumptions are often made in the literature. Deposition flux is typically assumed to be constant (Seggiani, 1998;Ye, 2015) or set to a fraction of the total solid flow rate entering the gasifier . Another common assumption is to consider a fixed profile for slag deposition along the wall (Yang, 2011) during steady state and dynamic simulations.…”

Section: Deposition Onto Slag Layermentioning

confidence: 99%

Modeling and Simulation of Components in an Integrated Gasification Combined Cycle Plant for Developing Sensor Networks to Detect Faults

Pednekar¹

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The goal of this work is to help synthesize a sensor network to detect and diagnose faults and to monitor conditions of the key equipment items. Faults or events that lead to loss in productivity occur over time. These faults, if not detected and mitigated at an early stage, can lead to severe loss in productivity, efficiency, and equipment damage, and can be a safety hazard. The desired algorithm for sensor network design would provide information about the number, type and location of sensors that should be deployed for fault diagnosis and condition monitoring of a plant. In this work, the focus was on the integrated gasification combined cycle (IGCC) power plant where the faults at the equipment level and the plant level are considered separately. At the plant level, the objective is to observe whether a fault has occurred or not and identify the specific fault. For component-level faults, the objective is to obtain quantitative information about the extent of a particular fault. For the model-based sensor network design, high-fidelity process model of the IGCC plant is the key requirement.

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Effect of Refractory Lining Thickness on Slag Layer Behavior in Cyclone Barrel

Tang

Zhu

et al. 2021

Clean Coal and Sustainable Energy

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Numerical modeling of slag flow and heat transfer on the wall of an entrained coal gasifier

Cited by 52 publications

References 20 publications

Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

Modeling and Simulation of Components in an Integrated Gasification Combined Cycle Plant for Developing Sensor Networks to Detect Faults

Effect of Refractory Lining Thickness on Slag Layer Behavior in Cyclone Barrel

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