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Synergistic Effect of Alkali Metals in Coal and Introduced CaO during steam gasification

Journal of Thermal Science 2020年第6期29卷 1627-1637页

作者： LIU Yang YANG Xinfang LEI Fulin XIAO Yunhan Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Research Center for Clean Energy and Power Chinese Academy of SciencesLianyungangJiangsu 222069China University of Chinese Academy of Sciences Beijing 100049China

The steam gasification kinetics of Zhundong raw coal and the washed coal by deionized water or hydrochloric acid with/without addition of CaO were tested by thermogravimetric analyzer(TGA)at medium temperatures(650℃ to 800℃).The cation contents of potassium and sodium in samples were determined by Inductively Coupled Plasma Optical Emission Spectrometer(ICP-OES).The Brunauer-Emmett-Teller(BET)surface area of the samples was tested by N2 adsorption,and the morphologies of the samples were characterized by scanning electron microscopy(SEM).Experimental results showed that the organic sodium was the main catalyst for the gasification of the pyrolysis char,and the gasification rate of the char could be enhanced further with the introduction of *** inherent alkali metals in coal and the introduced CaO showed a synergistic effect that occurred obviously above 735℃.The char conversion curves with or without CaO were fitted by the modified volumetric model(MVM).The calculated results indicated that the addition of CaO increased the pre-exponential factor obviously,but made little changes on the activation *** was proposed that the synergistic effect was resulted from the co-melting of the sodium and CaO,which facilitated the migration of the catalyst ions and the generation of C(O)intermediates for the gasification.

关键词： Zhundong coal alkali metals CaO synergistic effect steam gasification

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Reactivity and performance of steam gasification during biomass batch feeding

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Carbon Resources Conversion 2023年第3期6卷 229-237页

作者： Yuna Ma Zefeng Ge Mingxun Zeng Zhenting Zha Yujie Tao Huiyan Zhang Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096PR China

The steam gasification characteristics of poplar sawdust were investigated in a piston fed fixed-bed gasifier,reflecting the batch feeding process of fixed-bed gasifiers in industrial *** effects of operating conditions,including steam supply,the flow rate of inert gas,gasification temperature,and feeding rate,on gasification reactivity and performance were investigated *** major gas product during pyrolysis was CO,followed by H2,CH4,and CO_(2),and the gasification was greatly facilitated by the injection of steam to generate *** gasification reactivity and performance were improved with increased steam supply and *** maximum production rate of H_(2)by char gasification was tripled and doubled,respectively,with an increase in steam supply from 50 to 400 mL/min and a temperature rise from 800 to 900◦C,and the time required for complete gasification was also *** to pyrolysis,the volume fraction of H2 increased from 23%to 37%,and correspondingly,the H_(2)/CO ratio increased from 0.42 to 0.95.

关键词： Biomass steam gasification gasification reactivity Syngas Batch feeding

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Investigation on the catalytic effects of AAEM during steam gasification and the resultant char reactivity in oxygen using Shengli lignite at different forms

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International Journal of Coal Science & Technology 2015年第3期2卷 223-231页

作者： Jianxin Mi Ningbo Wang Mingfeng Wang Pengju Huo Dan Liu Hydrocarbon Research Center of Shaanxi YanchangPetroleum (Group) Co. Ltd. Xi'an 710075 China

The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species （AAEM） on char conversion during the gasification in steam and the changes in ex-situ char reactivity in oxygen after the gasification in steam using different forms （i.e. H-form, Na-form） of Shengli brown coal. The surface area, AAEM concentration and carbon crystallite of chars were obtained to understand the change in char reactivity. It was found that not only Na concentration and carbon structure were the main factors governing the char reactivity in the atmosphere of steam and oxygen, but also they interacted each other. The presence of Na could facilitate the formation of disordering carbon structure in char, and the amorphous carbon structure would in turn affect the distribution of Na and thus its catalytic performance. The surface area and pore volume had very little relationship with the char＇s reactivity. Addi- tionally, the morphology of chars from different forms of coals were observed using scanning electron microscope （SEM）.

关键词： steam gasification H-form coal Na-form coal Char reactivity Char structure

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Effect of fluidizing velocity on gas bypass and solid fraction in a dual fluidized bed gasifier and a cold model

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Particuology 2015年第1期13卷 58-65页

作者： Mook Tzeng Lim Woei-Lean Saw Shusheng Pang Department of Chemical and Process Engineering University of Canterbury Centre for Energy Technology School of Chemical EngineeringUniversity of Adelaide

Dual fluidized bed gasifiers （DFBG） are effective in producing nitrogen-free syngas from biomass. How- ever, to improve the gasifier performance, pressure drops and solid fractions within the DFBG system need to be controlled. In this study, the effects of varying the fluidizing velocity in the fast fluidized bed （FFB） on the pressure drops and the solid fractions in the system were investigated in a 100 kW DFBG and in a dual fluidized bed cold model （DFCM）. Based on the experimental results, empirical correlations were developed to predict the height-averaged solid fraction in the bottom section of the FFB. Accuracy and advantages of the correlations were analyzed. The correlation is useful for design and modeling of the DFBG systems where the height-averaged solid fraction is required to be determined.

关键词： Cold model Hydrodynamics steam gasification Dual fluidized bed

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Kinetic study on catalytic gasification of a modified sludge fuel

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Particuology 2008年第4期6卷 258-264页

作者： Byungho Song Dookie Kim Seungjae Lee Seokku Jeon Youngtai Choi Yoonseop Byoun Woonsig Moon Joonghee Lee Honggun Kim Hongki Lee Joongpyo Shim Department of Chemical Engineering Kunsan National University Department of Civil & Environmental Engineering Kunsan National University Korea Institute of Energy Research Process Plant Group Hyndai Engineering Co. Ltd. Korea Institute of Industrial Technology Micro Science Tech Co. Ltd. Core Technology Research Center for Fuel Cell Department of Mechanical & Auto. Engineering Jeonju University Department of Advanced Material Engineering Woosuk University

A new type of mixture fuel, sludge–oil–coal agglomerate (SOCA), was catalytically gasified with steam in a thermobalance reactor under atmospheric pressure. All the four catalysts studied (K2CO3, CaO, NiO and Fe2O3) were found capable of enhancing the steam gasification rate and significantly increasing the conversion of carbon. The ranking of catalytic activity was found to be K2CO3 CaO > NiO > Fe2O3. A modified volumetric-reaction model in the literature was used to describe the conversion behavior of the steam gasification studied by evaluating the kinetic parameters. Expressions of the apparent gasification rates for SOCA were presented for the design of catalytic gasification processes.

关键词： Sludge Coal Oil steam gasification Catalyst Thermobalance Kinetics

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Biomass Vapogasification in Fluidized Bed： Modelling of Char Population Balance and Experimental Validation

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Journal of Chemistry and Chemical Engineering 2010年第12期4卷 38-51页

作者： Marc Detoumay Mehrdji Hemati Chemical Engineering Laboratory U.M.R. 5503 ENSIACET 4 all~e Emile Monso-BP 84234 31432 Toulouse Cedex 4 France

The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimental cases. Its main goal is to have a better understanding on particles size distribution behaviour during operation of the fluidized bed, and in particular to be applied on the case of Fast Internally Circulating Fluidized Beds for char gasification. Results have shown that the initial properties of the fluidized bed particles （bed and size distribution） are almost not involved in the steady state obtained in continous operation, which is excusively dependent on the properties of the fed particles flow rate and size distribution, the withdrawal flow rate and the reaction properties. Morevoer, it has been proven that the steady state fluidized bed mass and size distribution may be theroretically controlled by an adequate choice of feeding and withdrawal flow rates.

关键词： Population balance size distribution steam gasification biomass char particles.

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