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Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers

Chinese Journal of Chemical Engineering 2024年第1期65卷 8-18页

作者： Qiyao Yang Xiaobin Qi Qinggang Lyu Zhiping Zhu North China Electric Power University Beijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China Shanxi Key Laboratory of coal Flexible Combustion and Thermal Conversion Datong 037000China University of Chinese Academy of Sciences Beijing 100049China Shanxi Engineering Research Center of coal Clean Efficient Combustion and GasificationDatong 037000China

coal gasification fly ash(CGFA)is an industrial solid waste from the coal circulating fluidized bed(CFB)gasification process,and it needs to be effectively disposed to achieve sustainable development of the *** realize the application of CGFA as a precursor of porous carbon materials,the physicochemical properties of three kinds of CGFA from industrial CFB gasifiers are ***,the activation potential of CGFA is acquired via steam activation experiments in a tube furnace ***,the fluidization activation technology of CGFA is practiced in a bench-scale CFB test rig,and its advantages are *** results show that CGFA is characterized by a high carbon content in the range of 54.06%–74.09%,an ultrafine particle size(d50:16.3–26.1 μm),and a relatively developed pore structure(specific surface area SSA:139.29–551.97 m^(2)·g^(-1)).The proportion of micropores in CGFA increases gradually with the coal *** activation experiments show that the pore development of CGFA mainly includes three stages:initial pore development,dynamic equilibrium between micropores and mesopores and pore *** SSA of lignite fly ash(LFA),subbituminous fly ash(SBFA)and anthracite fly ash(AFA)is maximally increased by 105%,13%and 72%after steam activation;the order of the largest carbon reaction rate and decomposition ratio of steam among the three kinds of CGFA is SBFA>LFA>*** the ratio of oxygen to carbon during the fluidization activation of LFA is from 0.09 to 0.19,the carbon conversion ratio increases from 14.4%to 26.8%and the cold gas efficiency increases from 6.8%to 10.2%.The SSA of LFA increases by up to 53.9%during the fluidization activation process,which is mainly due to the mesoporous *** to steam activation in a tube furnace reactor,fluidization activation takes an extremely short time(seconds)to achieve the same activation *** is expected to further improve the activation effect of LFA by regulating the carbo

关键词： Circulating fluidized bed coal gasification fly ash Steam activation Pore structure evolution Fluidization activation

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Physicochemical Properties of coal gasification fly ash from Circulating Fluidized Bed Gasifier

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Journal of Thermal Science 2023年第4期32卷 1710-1720页

作者： YANG Qiyao QI Xiaobin LYU Qinggang ZHU Zhiping School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The coal gasification fly ash(CGFA) is an industrial solid waste from coal gasification process and needs to be effectively disposed for environmental protection and resource *** further clarify the feasibility of CGFA to prepare porous carbon materials,the physicochemical properties of ten kinds of CGFA from circulating fluidized bed(CFB) gasifiers were analyzed in *** results of proximate and ultimate analysis show that the CGFA is characterized with the features of near zero moisture content,low volatile content as low as 0.90%-9.76%,high carbon content in the range of 37.89%-81.62%,and ultrafine particle size(d50=15.8-46.2 μm).The automatic specific surface area(SSA) and pore size analyzer were used to detect the pore structure,it is found that the pore structure of CGFA is relatively developed,and part of the CGFA has the basic conditions to be used directly as porous carbon *** SEM images,the microscopic morphology of the CGFA is significantly different,and they basically have the characteristics of loose and porous *** and Roman spectroscopy were used to characterize the carbon *** result shows that the CGFA contains abundant amorphous carbon structure,and thus the CGFA has a good reactivity and a potential to improve pore structure through further *** thermal gravimetric analysis,it can be concluded that the order of reactivity of the CGFA under CO_(2) atmosphere has a good correlation with the degree of metamorphism of the raw *** gasification reactivity of the CGFA is generally consistent with the change trend of micropores combined with the pore *** to the physicochemical properties,the CGFA has a good application prospect in the preparation of porous carbon materials.

关键词： circulating fluidized bed coal gasification fly ash physicochemical properties pore structure porous carbon materials

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