Localized Interaction between Coal-Included Minerals and Ca-Based CO2 Sorbents during the High-Pressure Steam Coal Gasification (HyPr-RING) Process
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- 作者：Koji Kuramoto ; Katsuyuki Ohtomo ; Koichi Suzuki ; Shinji Fujimoto ; Sayaka Shibano ; Koichi Matsuoka ; Yoshizo Suzuki ; Hiroyuki Hatano ; Osamu Yamada ; Lin Shi-Ying ; Michiaki Harada ; Kayoko Morishita ; and Ta
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2004
- 出版时间：December 8, 2004
- 年：2004
- 卷：43
- 期：25
- 页码：7989 - 7995
- 全文大小：471K
- 年卷期：v.43,no.25(December 8, 2004)
- ISSN：1520-5045
文摘
Pulverized Japanese bituminous coal (Taiheiyo coal) samples with diameter ranges of 38-75
m and 180-250 m were gasified with high-pressure steam in the presence of Ca-based CO2sorbents. The experiments were carried out at 873 and 973 K and at holding times rangingfrom 0 to 120 min using a laboratory-scale fixed-bed reactor, and the solid-solid reaction betweenthe Ca-based sorbents and the coal-included minerals during the steam gasification wasinvestigated. Local scanning electron microscopy-energy-dispersive X-ray analysis of the solidresidues obtained under different conditions showed that some constituents of the coal-includedminerals, such as Si and Al, were contained in the sorbent particles. The solid-solid interactionbetween the Ca-based sorbents and coal-included minerals became significant at the highertemperature and at longer holding periods. This interaction will locally decrease the CO2 sorptionability of the sorbents. However, when a holding time of less than 10 min was employed, thesolid-solid reaction between the minerals and the sorbents was suppressed, even at 973 K,because the rate of formation of inorganic compounds through solid-solid reaction was low. Inthis case, our target carbon conversion (about 50%) was attainable, owing to the devolatilizationduring the heating period. Our results indicate that the holding time of the feedstock in thereactor should be shortened to avoid deactivation of the Ca-based sorbents during high-pressuresteam gasification.
m and 180-250 m were gasified with high-pressure steam in the presence of Ca-based CO2sorbents. The experiments were carried out at 873 and 973 K and at holding times rangingfrom 0 to 120 min using a laboratory-scale fixed-bed reactor, and the solid-solid reaction betweenthe Ca-based sorbents and the coal-included minerals during the steam gasification wasinvestigated. Local scanning electron microscopy-energy-dispersive X-ray analysis of the solidresidues obtained under different conditions showed that some constituents of the coal-includedminerals, such as Si and Al, were contained in the sorbent particles. The solid-solid interactionbetween the Ca-based sorbents and coal-included minerals became significant at the highertemperature and at longer holding periods. This interaction will locally decrease the CO2 sorptionability of the sorbents. However, when a holding time of less than 10 min was employed, thesolid-solid reaction between the minerals and the sorbents was suppressed, even at 973 K,because the rate of formation of inorganic compounds through solid-solid reaction was low. Inthis case, our target carbon conversion (about 50%) was attainable, owing to the devolatilizationduring the heating period. Our results indicate that the holding time of the feedstock in thereactor should be shortened to avoid deactivation of the Ca-based sorbents during high-pressuresteam gasification.