Pyrolysis of coal hydroliquefaction residue in a dual loop reaction system
Pyrolysis of coal hydroliquefaction residue in a dual loop reaction system
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DOI：
10.1016/j.fuel.2017.10.078
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发表时间：
2018-01
期刊：
影响因子：
7.4
通讯作者：
Chao Wang;Shaoping Xu;Guangyong Wang;Yahui Xiao
中科院分区：
文献类型：
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作者：
Chao Wang;Shaoping Xu;Guangyong Wang;Yahui Xiao
为了利用煤加氢液化残渣，开发了一套双环反应系统，并在此系统上进行了煤加氢液化残渣常压热解试验。DLRS结合了三个反应器，即流化床热解器、径向流移动床过滤器和提升管燃烧器，随后是颗粒分级旋风分离器。这三个反应器构成两个并联的循环回路，即热解回路和过滤回路，分别以小颗粒和大颗粒石英砂为循环床料。采用气动给料器将混有石英砂的废碱液快速喷入流化床热解炉，实现废碱液的连续处理。在热解温度为500 ~ 550 ° C，煤与石英砂配比为1：4的条件下，可得到20wt%的无尘热解焦油，约为Fischer法热解焦油收率的2倍。己烷可溶部分（HS）和己烷不溶但甲苯可溶部分（沥青质，A）占焦油的近94wt%。在热解过程中，焦油中的HS几乎全部转移到焦油中。
To utilize the coal hydroliquefaction residue (CHR), a dual loop reaction system (DLRS) has been developed and upon which the pyrolysis of CHR was conducted under atmospheric pressure. The DLRS combines three reactors, i.e. a fluidized bed pyrolyzer, a radial-flow moving bed filter and a riser combustor followed by a particles grading cyclone. These three reactors form two parallel circulating loops, i.e. pyrolysis loop and filtration loop with small and big quartz sand particles as circulating bed materials, respectively. CHR mixed with quartz sand was injected into the fluidized bed pyrolyzer rapidly by a gas driven feeder, which makes it possible to dispose the CHR continuously. Under optimized blending ratio of CHR/quartz sand (1:4) and pyrolysis temperature from 500 °C to 550 °C, a dust-free pyrolysis tar with the yield of 20 wt% could be obtained, which was about two times of the Fischer Assay yield. The hexane soluble part (HS) and the hexane insoluble but toluene soluble part (asphaltene, A) account for nearly 94 wt% of the tar. Almost all the HS in the CHR was transferred into the tar during the pyrolysis.