Dissolution of lime into synthetic coal ash slags

Elliott, Liza; Wang, Shen Mao; Wall, Terry; Novak, F.; Lucas, John; Hurst, H.J.; Patterson, Joshua T.; Happ, Jim

doi:10.1016/s0378-3820(97)00083-0

Cited by 17 publications

(15 citation statements)

References 4 publications

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“…In contradiction to Matsushima's observation, Hachtel et al 5 investigated the dissolution of lime single‐crystals in FeO‐SiO 2 slag and found 2CaO · SiO 2 and 3CaO · SiO 2 phases between slag and CaO surface. Similar experiments were also carried out by other researchers 6–13 to study the dissolution mechanism and dissolution rate of lime or dolomite. Some of the results of lime dissolution studies seem to be in contradiction with the thermodynamic data.…”

Section: Introductionmentioning

confidence: 70%

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Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags

Deng

Gran

Sichen

2010

steel research int.

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Dissolution of different CaO samples into molten synthetic ‘FeO’‐SiO2 and ‘FeO’‐SiO2‐CaO slags was carried out in a closed tube furnace at 1873 K. The slag was kept stagnant. It was found that the dissolution rate was very fast when CaO rod was dipped into ‘FeO’‐SiO2 slag. In the case of ‘FeO’‐SiO2‐CaO slag, the dissolution of CaO rod in the stagnant slag was retarded after the initial period (2 minutes). Only less than 16 percent CaO reacted with the slag, irrespective of the type of lime. Three phase‐regions were identified in the reacted part of the lime rod by SEM‐EDS analysis. The formation of these regions was explained thermodynamically. A dense layer of 2CaO · SiO2 was found to be responsible for the total stop of the dissolution. It could be concluded that constant removal of the 2CaO · SiO2 layer would be of essence to obtain a high dissolution rate of lime. In this connection, it was found necessary to study the dissolution of lime in moving slag to reach a reliable conclusion regarding the relevance of the reactivity obtained by water ATSM test to the real reactivity of lime in high temperature slag.

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Section: Introductionmentioning

confidence: 70%

“…The dissolution of lime and dolomite into different slag systems has been the topic of many research studies 1–13. Russell 1 studied lime reactivity as well as dissolution rates and reported that the dissolution of lime could be determined at room temperature by the ASTM water reactivity test.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags

Deng

Gran

Sichen

2010

steel research int.

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“…Both types of ceramic rods were sintered at the temperature of 1873 K for 10 hours in a muffle furnace. After sintering, the spinel rod had a density of 3.2 g/cm 3 (apparent porosity < 5.0 pct) and the porous MgO had a density of 2.6 g/cm 3 …”

Section: B Setup At High Temperaturementioning

confidence: 99%

“…THE rotating disk/cylinder (rod) method has been widely applied to study the dissolution of solids in liquids for decades, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] in particular for high-temperature systems such as dissolution of solid metals into liquid metals, and dissolution of ceramic solids into liquid oxides (slags). While valuable information have been gained by these studies, some misconceptions in using this method need to be addressed and analyzed.…”

Section: Introductionmentioning

confidence: 99%

A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature

Wang

White

Sichen

2018

Metall Mater Trans B

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A new method was developed to study the dissolution of a solid cylinder in a liquid under forced convection at elevated temperature. In the new design, a rotating cylinder was placed concentrically in a crucible fabricated by boring four holes into a blank material for creating an internal volume with a quatrefoil profile. A strong flow in the radial direction in the liquid was created, which was evidently shown by computational fluid dynamic (CFD) calculations and experiments at both room temperature and elevated temperature. The new setup was able to freeze the sample as it was at experimental temperature, particularly the interface between the solid and the liquid. This freezing was necessary to obtain reliable information for understanding the reaction mechanism. This was exemplified by the study of dissolution of a refractory in liquid slag. The absence of flow in the radial direction in the traditional setup using a symmetrical cylinder was also discussed. The differences in the findings by past investigators using the symmetrical cylinder are most likely due to the extent of misalignment of the cylinder in the containment vessel.

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“…Figure 7 shows that the exit temperature of the gasifier increased with increasing O2/coal ratio since the increasing O2 increased the exothermic reaction. Elliott et al reported that ash, which remains when coal is gasified via the IGCC process, can melt at 1673-1773 K [46]. Therefore, the exit temperature of a gasifier should be maintained at a temperature higher than ~1800 K. The exit temperature gradually decreased with increasing steam/coal ratio since the endothermic carbon-steam gasification reaction took place.…”

Section: Effects Of O2/coal and Steam/coal Ratios (Design Coal)mentioning

confidence: 99%

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

2015

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Three-dimensional computational fluid dynamics (CFD) modeling of the gasification performance in a one-stage, entrained-bed coal gasifier (Shell Coal Gasification Process (SCGP) gasifier) was performed, for the first time. The parametric study used various O2/coal and steam/coal ratios, and the modeling used a commercial code, ANSYS FLUENT. CFD modeling was conducted by solving the steady-state Navier-Stokes and energy equations using the Eulerian-Lagrangian method. Gas-phase chemical reactions were solved with the Finite-Rate/Eddy-Dissipation Model. The CFD model was verified with actual operating data of Demkolec demo Integrated Gasification Combined Cycle (IGCC) facility in Netherlands that used Drayton coal. For Illinois #6 coal, the CFD model was compared with ASPEN Plus results reported in National Energy Technology Laboratory (NETL). For design coal used in the SCGP gasifier in Korea, carbon conversion efficiency, cold gas efficiency, temperature, and species mole fractions at the gasifier exit were calculated and the results were compared with those obtained by using ASPEN Plus-Kinetic. The optimal O2/coal and steam/coal ratios were 0.7 and 0.05, respectively, for the selected operating conditions.

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Dissolution of lime into synthetic coal ash slags

Cited by 17 publications

References 4 publications

Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags

Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags

A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

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Dissolution of lime into synthetic coal ash slags

Cited by 17 publications

References 4 publications

Dissolution of Lime in Synthetic ‘FeO’‐SiO2 and CaO‐‘FeO’‐SiO2 Slags

Dissolution of Lime in Synthetic ‘FeO’‐SiO2 and CaO‐‘FeO’‐SiO2 Slags

A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

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Product

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About

Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags

Dissolution of Lime in Synthetic ‘FeO’‐SiO₂ and CaO‐‘FeO’‐SiO₂ Slags