Influence of critical viscosity and its temperature on the slag behavior on the wall of an entrained coal gasifier

Ye, Insoo; Ryu, Changkook; Koo, Ja Hyung

doi:10.1016/j.applthermaleng.2015.05.027

Cited by 35 publications

(12 citation statements)

References 28 publications

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“…Slag viscosity is one of the most important physicochemical properties governing gas permeability, 1,2) slag/ metal separation 3,4) and desulfuration 5) in the blast furnace. So viscous behavior of the slag plays a critical role in determining the stability and productivity in the blast furnace operation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Al2O3 and MgO on the Viscosity and Stability of CaO–MgO–SiO2–Al2O3 Slags with CaO/SiO2=1.0

Sun

Liu²,

et al. 2017

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Influence of Al2O3 and MgO on the Viscosity and Stability of CaO–MgO–SiO2–Al2O3 Slags with CaO/SiO2=1.0

Sun

Liu²,

et al. 2017

ISIJ International

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“…It is considered as a key characteristic that affects the behavior of liquid slag on the gasifier wall. 23 The critical viscosity varies depending on the coal types, but the typical value of 25 Pa s is widely used. 24 A high-temperature rotational viscometer for the RV DVIII system (Theta Industries, Port Washington, NY) was used to measure the viscosity of coal slag, and the relationship between viscosity and temperature is shown in Figure 2 .…”

Section: Model Formulation and Simulation Settingsmentioning

confidence: 99%

Numerical Simulation on the Effect of Burner Bias Angles on the Performance of a Two-Stage Entrained-Flow Gasifier

Wang

et al. 2022

ACS Omega

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A 2000 t/day HNCERI (Huaneng Clean Energy Research Institute) entrained-flow pulverized coal gasifier suffers from the problem of a high ash–slag ratio. An appropriate bias angle of the burners is the key to solve this issue for the gasifier with a specific structure. A random pore model considering bulk and pore diffusion effects was extended by user-defined function to describe the gasification reactions. The simulation of the gas flow and char gasification characteristics under different bias angles (0, 1.5, 2.5, 3.5, and 4.5°) of the four burners in the first stage was conducted. The simulation results showed favorable agreement with the industrial data. The evaporation, devolatilization, and char oxidation mainly occurred in the first-stage jet zone, and the upflow and downflow zones are dominated by the gasification reactions. The bias angles of the burners mainly affect the scale of gasification reaction zones. As the bias angles increased from 0 to 4.5°, the gas temperature at the slag tap hole decreased from 1880 to 1500 K. The carbon conversion efficiency of the first stage decreases and that of the second stage increases with the bias angle increasing. An optimal bias angle of 2.5° is recommended for the HNCERI gasifier with a total carbon conversion efficiency of 98.16%.

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“…The main method to measure the slag behaviors is through modeling and simulation. From the previous research studies, several models have been proposed to describe the slag flow and heat transfer in a gasifier. − Seggiani has built a model for a Prenflo gasifier based on the conservation equations and some assumptions, which was widely used in many literature studies. − In this model, the temperature profile was assumed as linear, and the interface temperature of the solid–liquid slag layer was assumed as the temperature of critical viscosity ( T cv ). Several modified models were proposed subsequently based on the Seggiani’s model, such as considering the shear stress of gas and the deposited slag at the slag surface .…”

Section: Introductionmentioning

confidence: 99%

Modeling Study of the Slag Behaviors and SiC Refractory Wall Corrosion on the Top Cone of a Membrane Wall Entrained-Flow Gasifier

2020

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Slag behaviors on the top cone are significant characteristics that relate to the refractory wall corrosion and safe operation in a membrane wall gasifier. The slag flow and heat transfer model was established to predict the slag behaviors on the top cone of a gasifier. The results showed that the closer to the top outlet of the gasification chamber, the thinner the slag thickness, the higher the slag layer heat flux density and refractory wall surface temperature. The mean slag thickness of the top cone was thinner and the mean heat flux density of the top cone was higher than that of the bottom cone, thus the protection of the upper refractory wall was weakened. Especially, the heat transfer rate of the overall top cone significantly decreased when the cone angle increased. Moreover, the refractory wall corrosion model was built based on the active oxidation behavior. The results showed that the refractory wall surface temperature and linear corrosion rate significantly increased, while the gas temperature increased.

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Influence of critical viscosity and its temperature on the slag behavior on the wall of an entrained coal gasifier

Cited by 35 publications

References 28 publications

Influence of Al<sub>2</sub>O<sub>3</sub> and MgO on the Viscosity and Stability of CaO–MgO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slags with CaO/SiO<sub>2</sub>=1.0

Influence of Al<sub>2</sub>O<sub>3</sub> and MgO on the Viscosity and Stability of CaO–MgO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slags with CaO/SiO<sub>2</sub>=1.0

Numerical Simulation on the Effect of Burner Bias Angles on the Performance of a Two-Stage Entrained-Flow Gasifier

Modeling Study of the Slag Behaviors and SiC Refractory Wall Corrosion on the Top Cone of a Membrane Wall Entrained-Flow Gasifier

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