Viscosity and crystal morphology data of anorthite bearing synthetic coal slag systems

Schupsky, Jan Peter; Saar, Olga; Wu, Guixuan; Dohrn, Matthias; Müller, Michael

doi:10.1016/j.fuel.2020.118663

Cited by 16 publications

(5 citation statements)

References 41 publications

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“…The FactSage calculation shows stable crystals, e.g., silicates Na 4 CaSi 3 O 9 , in the melt at temperatures below 1125 °C in V79, V86, and V87. These crystals cause an increase of viscosity because of mechanical resistance of the formed crystals dependent on the shape 11, 34, 35 which results in an inconsistent flow behavior 36, 37. Furthermore, the crystallization leads to a significant decrease in Na 2 O content in the melt.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Slag Mobility of Biomass Fuels in a Pilot‐scale Entrained‐Flow Gasifier

Mielke

Eberhard

et al. 2021

Chem Eng & Technol

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The bioliq® process, developed at the Karlsruhe Institute for Technology, aims at the production of synthetic fuels and chemicals from biomass. The bioliq® technology is based on a two‐step process with decentral pyrolysis for the production of a transportable slurry from residual biomass and the central entrained‐flow gasification of the slurry by using biomass‐to‐liquid technology. This study is focused on the slag, which is formed by melting the inorganic ash components during gasification. To operate the gasifier smoothly, a range of desired viscosity has to be defined. A structure‐based viscosity model was used to predict the viscosity of the slags at the gasifier outlet. A good agreement between experimental and calculated viscosities is achieved for fully liquid slag systems.

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Section: Resultsmentioning

confidence: 99%

Optimization of Slag Mobility of Biomass Fuels in a Pilot‐scale Entrained‐Flow Gasifier

Mielke

Eberhard

et al. 2021

Chem Eng & Technol

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“…Similar findings were reported in literature. 17,37,38 Compared with C10M0 and C8M2, C6M4 showed a weak crystallization trend, resulting in a lower T cv and a smoother viscosity-temperature curve.…”

Section: Crystallization Behavior and Viscosity Transformationmentioning

confidence: 99%

Performance of minerals and crystallization properties of synthetic slags with various CaO/MgO in slagging gasifiers

Wang

Liu

Raheem

et al. 2022

Asia-Pacific J Chem Eng

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The fluidity of coal ash slag at high temperatures is an important factor that determines its applicability and operating conditions in entrained flow gasification. In this study, six synthetic slags with different CaO/MgO rations were prepared to study their effect on slag fluidity. The results showed that the flow temperature of slags decreased first and then increased with the decrease of CaO/MgO ratio. When the slag had a high or low CaO/MgO ratio, or when the contents of CaO and MgO in the slag were similar, the homogeneous slag showed a lower viscosity. The crystallization tendency of Ca was stronger than that of Mg. During cooling, slags with high or low CaO/MgO ratio showed obvious crystallization tendency, and formation of crystals would lead to a sharp increase in slag viscosity, so that the temperature of critical viscosity of slags decreased first and then increased with the decrease of CaO/MgO ratio.

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“…Coal gasification technology has become a popular substitute for coal combustion due to its clean operation and ability to produce gas for various applications. Coal gasification is one of the technologies developed to reduce CO 2 emissions and offers a high process efficiency . Because it is cleaner and has a higher energy efficiency, coal gasification processes are an essential part of future carbon emission reduction strategies.…”

Section: Introductionmentioning

confidence: 99%

“…The entrained flow gasifier is operated at a temperature between 1400 and 1600 °C, and the ash forms slag, which flows along the surface of the refractory wall to the gasifier’s bottom and is discharged from the gasifier. The characteristic of the slag is an important parameter that determines the efficiency of the slagging gasifiers . To ensure an optimal thickness of the slag layer and to avoid clogging by sticky slag, the viscosity of the deepest slag layer should ideally be in the range of 2–25 Pa·s, so T 25 (a temperature where the slag has a viscosity of 25 Pa·s) is often considered as the minimum gasification temperature. ,− Special attention to the viscosity of the slag as a function of the gasification temperature is needed to keep the gasifier in good operation.…”

Section: Introductionmentioning

confidence: 99%

“…Coal gasification is one of the technologies developed to reduce CO 2 emissions and offers a high process efficiency. 1 Because it is cleaner and has a higher energy efficiency, coal gasification processes are an essential part of future carbon emission reduction strategies. Gasification is a thermochemical conversion of carbon-based solid fuels to synthetic gas (syngas).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Minor Oxide and Residual Carbon on Coal Ash Crystallization Behavior and Slag Properties during Coal Gasification: Critical Literature Review and Thermodynamic Simulation

Listiyowati,

Santoso,

Sanwani

et al. 2023

ACS Omega

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Coal-ash-associated problems seriously limit the industrial application of entrained flow coal gasification. There have been many studies of this issue. However, many problems still need to be fully understood, especially regarding the effect of minor oxides and residual carbon on the crystallization of slag in coal ash systems. Crystals formed in slag affect the slag properties, especially its viscosity. This article reviews the crystallization behavior of coal ash slag and its impact on ash fusion temperature (AFT) and temperature of critical viscosity (Tcv). A thermodynamic simulation using FactSage 7.3 thermochemical software was performed to study the effect of minor oxides (i.e., Na2O, K2O, and TiO2) and residual carbon at a temperature range of 1000–1700 °C on the phase transformation in the oxide system. The literature review reveals that the minor oxides and residual carbon in coal ash affect the AFT and the coal slag’s Tcv. The thermodynamics simulation indicated that Na2O, K2O, and TiO2 tend to decrease Tcv, while the residual carbon increase Tcv.

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Viscosity and crystal morphology data of anorthite bearing synthetic coal slag systems

Cited by 16 publications

References 41 publications

Optimization of Slag Mobility of Biomass Fuels in a Pilot‐scale Entrained‐Flow Gasifier

Optimization of Slag Mobility of Biomass Fuels in a Pilot‐scale Entrained‐Flow Gasifier

Performance of minerals and crystallization properties of synthetic slags with various CaO/MgO in slagging gasifiers

Effect of Minor Oxide and Residual Carbon on Coal Ash Crystallization Behavior and Slag Properties during Coal Gasification: Critical Literature Review and Thermodynamic Simulation

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