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A comparative study on demineralization of coals by acid-washing and solvent-extraction methods for low temperature catalytic coal gasification application

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Carbon Resources Conversion 2019年第3期2卷 175-181页

作者： Atul Sharma Akimitsu Matsumura Research Institute of Energy Frontier Non-conventional Carbon Resources GroupNational Institute of Advanced Industrial Science&Technology16-1OnogawaTsukubaJapan

catalytic coal gasification is an efficient way to achieve high conversion rates at low temperatures.Catalyst loss due to the reaction between the inherent mineral matter in the coal and the catalyst is a major hurdle for its practical application.The problem may be overcome by removing the mineral matter from the coal before use.Two demineralizing approaches,acid-washing and solvent-extraction methods are investigated for demineralizing the coals.Elemental analysis,XRD analysis,NMR analysis,and N_(2)adsorption analysis were made to compare the demineralization efficiency,crystallographic carbon microstructure,chemical structure,and micro-porosity,respectively.Solvent-extraction method was found be more efficient for demineralization.Difference was observed in the chemical structure and micro-porosity while crystallographic carbon-microstructure was found to be similar.Non-catalytic and catalytic gasification reactivity of the chars obtained by the two methods was compared.Gas composition and gas evolution profiles were also obtained and found to be influenced by the degree of demineralization.

关键词： Coal Demineralization Acid washing Solvent extraction catalytic gasification

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Efficient gasification of wet biomass residue to produce middle caloric gas

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Particuology 2008年第5期6卷 376-382页

作者： Guangwen Xu Takahiro Murakami Toshiyuki Suda Hidehisa Tani Yutaka Mito Research Laboratory IHI Co. Ltd. (IHI) Isogo-Ku Yokohama 235-8501 Japan State Key Laboratory of Multiphase Phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Energy Research Division Kobe steel Co. Ltd. Kobe Hyogo 651-2271 Japan

Various process residues represent a kind of biomass resource already concentrated but containing water as much as 60 wt.%. These materials are generally treated as waste or simply combusted directly to generate heat. Recently, we attempted to convert them into middle caloric gas to substitute for natural gas, as a chemical or a high-rank gaseous fuel for advanced combustion utilities. Such conversion is implemented through dual fluidized bed gasification （DFBG）. Concerning the high water content of the fuels, DFBG was suggested to accomplish either with high-efficiency fuel drying in advance or direct decoupling of fuel drying/pyrolysis from char gasification and tar/hydrocarbon reforming. Along with fuel drying, calcium-based catalyst can be impregnated into the fuel, without much additional cost, to increase the fuel＇s gasification reactivity and to reduce tar formation. This article reports the Ca impregnation method and its resulting effects on gasification reactivity and tar suppression ability. Meanwhile, the principle of directly gasifying wet fuel with decoupled dual fluidized bed gasification （D-DFBG） is also highlighted.

关键词： High-water content biomass catalytic gasification Dual fluidized bed gasification Decoupled gasification Calcium

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Novel application of red mud as disposal catalyst for pyrolysis and gasification of coal

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Carbon Resources Conversion 2021年第1期4卷 10-18页

作者： Zhaohui Chen Deliang Wang Hang Yang Yusheng Zhang Yunjia Li Changming Li Jian Yu Shiqiu Gao State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Chemical Engineering Polytechnique MontrealMontrealQC H3C 3A7Canada

Red mud(RM)with the high alkalinity as a catalyst was evaluated for coal pyrolysis in a fixed bed as well as CO_(2) gasification of its resultant char in a thermogravimetric analyzer(TGA).The addition of RM into coal could improve the quality of tar during pyrolysis and enhance the reactivity of char during gasification.For catalytic pyrolysis with 12 wt%RM at 600℃,the light fraction in tar was 72.0 wt%,which increased by 20.0%,compared with coal pyrolysis alone.The role of metal oxides in RM on coal pyrolysis was further clarified as well.After catalytic pyrolysis with RM,the specific surface area of resultant char increased,especially for mesoporous surface area,and meanwhile the sodium in RM was proved to migrate to the char surface.These positive factors contributed to the CO_(2) gasification activity of char.RM with the high alkalinity showed a promising catalyst candidate for coal pyrolysis and gasification in terms of its catalytic effects and low cost.

关键词： catalytic coal pyrolysis Red mud Tar upgrading Metal oxides Sodium migration catalytic gasification

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Physico-chemical structure evolution characteristics of coal char during gasification in the presence of iron-based waste catalyst

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International Journal of Coal Science & Technology 2020年第3期7卷 456-463页

作者： Xinsha Zhang Xudong Song Jiaofei Wang Weiguang Su Bing Zhou Yonghui Bai Guangsuo Yu State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan750021China CHN Energy Ningxia Coal Industry Co. Ltd.Yinchuan750000China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai200237China

The present study aims to explore the physico-chemical structure evolution characteristic during Yangchangwan bituminous coal(YCW)gasification in the presence of iron-based waste catalyst(IWC).The catalytic gasification reactivity of YCW was measured by thermogravimetric analyzer.Scanning electron microscope–energy dispersive system,nitrogen adsorption analyzer and laser Raman spectroscopy were employed to analyze the char physico-chemical properties.The results show that the optimal IWC loading ratio was 5 wt%at 1000°C.The distribution of IWC on char was uneven and Fe catalyst concentrated on the surface of some chars.The specific surface area of YCW gasified semi-char decreased significantly with the increase of gasification time.i.e.,the specific surface area reduced from 382 m2/g(0 min)to 192 m2/g(3 min),meanwhile,the number of micropores and mesopores decreased sharply at the late gasification stage.The carbon microcrystalline structure of YCW gasified semi-char was gradually destroyed with the increase of gasification time,and the microcrystalline structure with small size was gradually generated,resulting in the decreasing order degree of carbon microcrystalline structure.IWC can catalyze YCW gasification which could provide theoretical guidance for industrial solid waste recycling.

关键词： Char structure Characteristic Iron-based waste catalyst catalytic gasification

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Dual Fluidized Bed gasification of High Water Content Biomass: Potential Technical Ways to Increase Efficiency and Eliminate Tars

Dual Fluidized Bed Gasification of High Water Content Biomas...

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中国颗粒学会2006年年会暨海峡两岸颗粒技术研讨会

作者： Takahiro Murakami Toshiyuki Suda Hidehisa Tani Toshiro Fujimori Ishikawajima-Harima Heavy Industries （IHI） Co. Ishikawajima-Harima Heavy Industries （IHI） Co. Ishikawajima-Harima Heavy Industries （IHI） Co. Ishikawajima-Harima Heavy Industries （IHI） Co.

＜正＞Dual fluidized bed gasification （DFBG） allows the production of middle-caloric gas free of serious dilution by N2 of combustion air. It is particularly suitable to thermal conversion of biomass at energy capacities of tens to hundred of MW because of its involvement of fluidized bed gasifier that has to run at temperatures below 1173 K. This article concerns the application of DFBG to various high water content residues generated in beverage, seasoner and food industries. These residues, such as coffee grounds, tee grounds, vinegar lees and bagasse, represent a kind of biomass resources that are concentrated already. A few potential technical means were proposed and further tested in a 5.0 kg/h pilot gasification facility to increase gasification efficiency and suppress tar evolution. These include the choice of superior technical deployment for DFBG, the impregnation of Ca onto fuel in fuel drying, and the integration of gas cleaning with fuel gasification via two-stage DFBG （T-DFBG）. The attained results demonstrated that all the means were effective to certain degrees, but the Ca-impregnated fuel exhibited distinctively high upgrades for both fuel conversion efficiency and tar elimination capability. An advanced approach called the decoupled DFBG （D-DFBG） was also devised to gasify high water content biomass directly by making use of vaporized fuel water as part of steam reagent and taking advantage of the catalysis of char to eliminate tars.

关键词： high water content biomass catalytic gasification dual fluidized bed gasification decoupled gasification in-bed gas upgrading calcium two-stage fluidized bed

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