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Received July 1, 2011
Accepted August 16, 2011
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Coal fouling characteristic to deposit probe with different temperatures under the gasification condition
Division of Energy Systems Research, Graduate School, Ajou University, Wonchon-dong, Yeongtong-gu, Suwon 443-749, Korea 1Plant Engineering Center, IAE, Wonchon-dong, Yeongtong-gu, Suwon 443-749, Korea
htkim@ajou.ac.kr
Korean Journal of Chemical Engineering, April 2012, 29(4), 464-472(9), 10.1007/s11814-011-0214-2
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Abstract
Coal gasification was carried out to verify the coal fouling characteristic in a drop tube furnace (DTF). Four pulverized coal samples, in the range of bituminous and sub-bituminous, were used. To analyze the fouling characteristic by different temperature of deposit probe, a two-stage deposit probe was used in the experiment. Ash deposition rate was at upper deposit probe higher than at lower one. The X-ray fluorescence (XRF) results indicated that coal fouling included acid minerals such as SiO2 and Al2O3 at upper deposit probe more than that at lower deposit probe. The results of X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicated that the fouling particles at high deposit temperature were agglomerated more than those at low deposit temperature. And the convective heat transfer efficiency was reduced by ash deposition on probe. Especially, the convective heat transfer coefficient substantially declined with small particle size of fouling and Fe2O3, CaO, and MgO.
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