Coal ash behavior in reducing environments

Erickson, T.A.; Benson, Sara; Steadman, Edward N.; Brekke, D.W.; Folkedahl, Bruce C.; Tibbetts, James E.; Nowok, Jan W.

doi:10.2172/10185671

Cited by 1 publication

(1 citation statement)

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“…However, an important factor in the successful design and operation of coal gasification systems is the ability to control and mitigate ash-related problems. 1 For example, during the first commercial operating year of the Wabash River Coal Gasification Repowering Project designed with E-GAS technology, deposition occurring in the second stage gasifier and the syngas cooler brought difficulties in maintaining operation and extended scheduled shutdowns because of the need to remove the deposits. 2 The Polk Power Station IGCC Project with using Texaco Technology also experienced several convective syngas cooler pluggings.…”

Section: Introductionmentioning

confidence: 99%

Melting Behavior of Typical Ash Particles in Reducing Atmosphere

Wang

Qiu

et al. 2012

Energy Fuels

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Two coal ashes (one with high-melting temperature and one with low-melting temperature) obtained at 600 °C in air were pressed into pellets and further treated for 1 h at different temperatures from 700 to 1200 °C at the interval of 100 °C in reducing atmosphere (mole ratio CO:CO 2 = 60:40) to investigate the melting behavior of typical ash particles. The final structures were characterized by XRD and SEM-EDX. The results showed that most Na, K, Ca, and Fe took the form of aluminosilicates. Although the low-melting particles (Na−K-enriched aluminosilicate particles and Ca−Fe-enriched aluminosilicate particles) were small in number percentage, these particles were already melted at 1000 °C. It is possible that Fe was enriched more readily in particles than Ca. The extent of fragmentation of calcite particle was closely related to the calcite type. The calcite particles with layered textures fragmented more. Gaussian distribution successfully simulated the calcite particle size distribution after calcite particle fragmentation. The detailed mechanism analysis showed that the Fe−O particle dissolution was primarily controlled by diffusion. The Fe−O crystals from pyrite and siderite showed similar patterns of crystal growth.

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Section: Introductionmentioning

confidence: 99%