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

Journal Article · · Fuel Processing Technology

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.

Research Organization:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Organization:
USDOE
OSTI ID:
1240881
Report Number(s):
NETL-PUB-20045; PII: S0378382015301727
Journal Information:
Fuel Processing Technology, Vol. 142, Issue C; ISSN 0378-3820
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (3)

Synergistic effect of CaO and MgO addition on coal ash fusibility in a reducing atmosphere journal July 2019
Ash fusion temperature regulation mechanism of Xiangyang coal by coal blending journal July 2019
Bed Particle Agglomeration and Defluidization in the Rubber Wood and Coir-Fired Fluidized Bed journal June 2018

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