洁净煤技术

2020, v.26;No.129(05) 26-35

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水煤浆热解及煤焦结构特性分析
Analysis of coal water slurry pyrolysis and coal char structure characteristics

王旭阳;于洁;徐林林;孙路石;
WANG Xuyang;YU Jie;XU Linlin;SUN Lushi;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

摘要(Abstract):

为了研究水煤浆的浓度与热解温度对热解气生成以及煤焦结构的变化规律,对内蒙古烟煤原煤及不同浓度水煤浆(55%、60%和65%)在不同温度下(800、900和1 000℃)快速热解,考察了不同的热解气生成量随热解温度和水煤浆浓度的变化,并利用XRD和Raman分析了热解后煤焦结构随热解温度和水煤浆浓度的变化规律。结果表明,在水煤浆浓度不变的情况下,随着热解温度升高,CO、CH_4、CO_2、H_2、HCN和NH_3的生成量均逐渐升高,且HCN生成量远高于NH_3生成量;在温度不变的情况下,随水煤浆浓度升高(水含量降低),CO和CH_4生成量均逐渐增加,而CO_2、H_2、HCN和NH_3的生成量均逐渐降低。XRD结果表明,随热解温度升高和水煤浆中水含量增加,煤焦的晶面间距d_(002)逐渐减小,堆垛高度L_c逐渐增大。Raman结果表明,随热解温度升高和水煤浆中水含量增加,煤焦的A_(D1)/A_G和A_(D3)/A_G逐渐减小,A_G/A_(all)逐渐增大。表明煤焦中碳微晶结构有序化程度随热解温度升高和水含量的增加而逐渐增加,煤焦石墨化程度升高。XRD与Raman关联可得在水煤浆热解过程中,随热解温度和水煤浆浓度的变化,d_(002)与A_(D1)/A_G变化、L_c与A_G/A_(all)变化均呈正相关。
In order to study the effect of coal water slurry(CWS) concentration and pyrolysis temperature on the formation of pyrolysis gas and the structure of coal char,the rapid pyrolysis of Inner Mongolia bituminous coal and coal water slurry with different concentrations(55%,60%and 65%) was tested at different temperatures(800,900 and 1 000℃),the change law of pyrolysis gas of coal water slurry with pyrolysis temperature and coal water slurry concentration was investigated,and the microcrystalline structure changes of coal char after pyrolysis of coal water slurry and coal powder were analyzed by XRD and Raman.The results show that under the constant concentration of coal water slurry,the production of CO,CH_4,CO_2,H_2,HCN and NH_3 gradually increases with the increase of temperature,and the production of HCN is much higher than that of NH_3.At a constant temperature,with the increase of the raw coal concentration in the coal water slurry,the production of CO and CH_4 gradually increases,while the production of CO_2,H_2,HCN and NH_3 gradually decreases.The results of XRD show that with the increase of pyrolysis temperature and the increase of water content in coal water slurry,the d_(002)of coal char of coal water slurry gradually decreases,and the L_cgradually increases.The results of Raman show that with the increase of pyrolysis temperature and the increase of water concentration,A_(D1)/A_G and A_(D3)/A_G gradually decrease,while A_G/A_(all)gradually increases.These show that the degree of ordering of the carbon microcrystal structure in coal char gradually increases with the increase of pyrolysis temperature and water concentration,and the graphitization degree of coal char increases.The correlation analysis between Raman and XRD shows that during the pyrolysis of coal water slurry,d_(002) is positively correlated with A_(D1)/A_G and L_c is positively correlated with A_G/A_(all)with the change of pyrolysis temperature and coal water slurry concentration.

关键词(KeyWords): 水煤浆;快速热解;热解气;煤焦结构;XRD;Raman
coal water slurry;fast pyrolysis;pyrolysis gas;coal char structure;XRD;Raman

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基金项目(Foundation): 国家重点研发计划资助项目(2018YFB0604202-01)

作者(Author): 王旭阳;于洁;徐林林;孙路石;
WANG Xuyang;YU Jie;XU Linlin;SUN Lushi;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

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DOI: 10.13226/j.issn.1006-6772.20080701

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