Relationship of Coal-Ash Viscosity to Chemical Composition

Sage, W.L.; McIlroy, J. B.

doi:10.1115/1.3672737

Cited by 41 publications

(17 citation statements)

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“…Reid and Cohen hypothesized that the T cv = ST [37], noting that "[t]he softening temperature is a fair measure of the temperature of critical viscosity, although large unexplained differences can occur." Sage and McIlroy proposed the use of a relationship based on the hemispherical temperature consistent with the ASTM definition, offset by 200°F (111°C) [95]:…”

Section: Correlation With Ash Fusion Temperaturesmentioning

confidence: 99%

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Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Hsieh

Kwong

Bennett

2016

Fuel Processing Technology

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Coal gasification yields synthesis gas, an important intermediate in chemical manufacturing. It is also vital to the production of liquid fuels through the Fischer-Tropsch process and electricity in Integrated Gasification Combined Cycle power generation. Minerals naturally present in coal become molten in entrained-flow slagging gasifiers. Molten coal ash slag penetrates and dissolves refractory bricks, leading to costly plant shutdowns. The extent of coal ash slag penetration and refractory brick dissolution depends on the slag viscosity, the gasification temperature, and the composition of slag and bricks. We measured the viscosity of several synthetic coal ash slags with a high-temperature rotary viscometer and their ash fusion temperatures through optical image analysis. All measurements were made in a carbon monoxide-carbon dioxide reducing atmosphere that approximates coal gasification conditions. Empirical correlation models based on ash fusion temperatures were used to calculate critical viscosity temperatures based on the coal ash compositions. These values were then compared with those obtained from thermodynamic phase-transition models. An understanding of slag viscosity as a function of ash composition is important to reducing refractory wear in slagging coal gasifiers, which would help to reduce the cost and environmental impact of coal for chemical and electricity production.Published by Elsevier B.V.

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Section: Correlation With Ash Fusion Temperaturesmentioning

confidence: 99%

“…suggested the use of the hemispherical temperature as the basis for predicting the critical viscosity temperature of eastern U.S. coals containing iron oxides [95]. Marshak and Ryzhakov also proposed the use of the hemispherical temperature, equivalent to t B as defined in GOST 2057, to estimate T cv [36].…”

Section: Ash Cone Fusion Testmentioning

confidence: 99%

Correlation between the critical viscosity and ash fusion temperatures of coal gasifier ashes

Hsieh

Kwong

Bennett

2016

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…Many researchers expressed slag viscosity as a function of the content of the principal oxides frequently found in coal ash, i.e. SiO 2 , Al 2 O 3 , TiO 2 , Fe 2 O 3 , CaO, MgO, Na 2 O and K 2 O. Sage and Mcilroy [8] applied the laboratory ash to predict the liquid slag behavior in the furnace and related the viscosity of ash to chemical composition. Song et al [9] characterized the effect of CaO on the flow properties of slag from a Shell gasifier.…”

Section: Introductionmentioning

confidence: 99%