Direct production of high hydrogen syngas by steam gasification of Shengli lignite/chars: Remarkable promotion effect of inherent minerals and pyrolysis temperature
Direct production of high hydrogen syngas by steam gasification of Shengli lignite/chars: Remarkable promotion effect of inherent minerals and pyrolysis temperature
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胜利褐煤/炭蒸汽气化直接生产高氢合成气：固有矿物质和热解温度促进作用显着
DOI：
10.1016/j.ijhydene.2016.11.068
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发表时间：
2017-03
影响因子：
7.2
通讯作者：
Qi Yaode
中科院分区：
文献类型：
--
作者：
Li Na;Li Yang;Ban Yanpeng;Song Yinmin;Zhi Keduan;Teng Yingyue;He Runxia;Zhou Huacong;Liu Quansheng;Qi Yaode
在实验室固定床微型反应器上对胜利褐煤和脱矿褐煤/半焦进行了水蒸气气化试验。系统地研究了SL褐煤/半焦的合成气析出速率、碳转化率、气体产物产率和H2/CO摩尔比。同时，将SL褐煤/半焦的气化性能与相应脱矿样品进行了比较。结果表明，SL褐煤/半焦中的固有矿物质不仅能有效促进水蒸气气化反应，而且能显著提高水蒸气气化反应生成H2和CO2的选择性。扫描电子显微镜（SEM-EDS）和X射线荧光（XRF）表征结果表明，随着热解温度的升高，SL褐煤中的矿物被盐酸溶液洗脱的难度增大。结果表明，在热解过程中，褐煤与矿物质形成了金属-褐煤中间络合物。形成的金属-褐煤中间络合物作为活性中心，有效地促进了SL褐煤/半焦的水蒸气气化性能，尤其有利于直接生成高氢合成气。
The steam gasification of Shengli (SL) lignite and the demineralized lignite/chars were tested on a laboratory fixed-bed micro reactor system. The evolution rates of syngas, carbon conversions to gas, yields of gaseous products, and H2/CO molar ratios of SL lignite/chars were systematically investigated. Meanwhile, the gasification performance of SL lignite/chars was compared with the corresponding demineralized samples. The results showed that the inherent minerals in SL lignite/chars not only effectively promoted the steam gasification reaction but also considerably improved the gasification selectivity towards the production of H2and CO2. Further characterizations by the scanning electron microscope (SEM-EDS) and X-ray fluorescence (XRF) demonstrated that it became more difficult for the minerals in SL lignite being eluted by hydrochloric acid solution with the temperature increasing of pyrolysis process. The results confirmed that the inherent minerals and lignite formed metals-lignite intermediate complex during pyrolysis process. The formed metals-lignite intermediate complex works as the active sites which effectively promote the steam gasification performance of SL lignite/chars, especially in favor of the direct generation of high hydrogen syngas.
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