A study of gasification behavior of residues from mild coal hydro-liquefaction
A study of gasification behavior of residues from mild coal hydro-liquefaction
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弱煤加氢液化残渣气化行为研究
DOI：
10.1016/j.fuel.2021.120456
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发表时间：
2021-06
期刊：
影响因子：
7.4
通讯作者：
Hengfu Shui
中科院分区：
文献类型：
--
作者：
Jingchong Yan;Jing He;Qitong Yang;Zongqing Bai;Zhiping Lei;Zhanku Li;Chao Xue;Zhicai Wang;Shibiao Ren;Shigang Kang;Hengfu Shui
煤加氢液化是生产液体燃料的重要手段，是保障我国等石油资源匮乏国家能源安全的重要手段。液化残渣约占进料煤的三分之一，其利用对于降低加氢液化成本至关重要。残渣可以气化产生氢气，从而消除有害固体废物.液化残渣是未反应煤、重组分、煤中固有矿物质和废催化剂的复杂混合物。本文研究了渣油（Res）、脱灰渣油（DeR）和原煤（PAA）的结构特征和气化反应性。结果表明，残渣中富集的矿物对气化反应有明显的促进作用，而致密稠合的芳香结构对气化反应有明显的抑制作用。在等温CO2气化过程中，气化速率的大小顺序为Coal≥ Res_DeR> PAA.采用均匀反应（UR）模型和未反应收缩核（USC）模型对气化反应进行动力学分析，两种模型得到的动力学参数（E α和A）具有较好的相关性。相比之下，USC模型在描述煤和残渣亚组分的气化行为方面均优于UR模型，且具有上级的优势。这些结果对优化气化条件、实现残渣的清洁高效利用具有潜在的指导意义。
Coal hydro-liquefaction is important means for producing liquid fuel thus ensuring energy security for countries lacking crude oil reserves such as China. Liquefaction residues account for one third of feeding coal and its utilization is crucial for reducing the cost of hydro-liquefaction. Residues can be gasified to produce H 2 thus eliminate the hazardous solid waste. Liquefaction residues are complex mixture of unreacted coal, heavy components, inherent mineral matters in coal and used catalysts. This work investigated the structural features and gasification reactivity of the sub-fractions of residues (Res) including preasphaltene and asphaltene (PAA), deashed residues (DeR), and raw coals were also used for comparison. The results showed that the enriched minerals in the residues significantly accelerated gasification while the compact and condensed aromatic structures remarkably inhibited the reaction. The gasification rate decreased in the order Coal≥ Res≫ DeR> PAA during isothermal CO 2 gasification. Kinetic analysis of gasification was performed with the uniform reaction (UR) and unreacted shrinking core (USC) model, and the kinetic parameters (E α and A) obtained with the two models were well correlated. Comparatively, USC model was superior to UR model in describing the gasification behaviors of both the coals and the sub-fraction of the residues. These results are potentially helpful for optimizing gasification conditions and realizing clean and efficient utilization of the residues.
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影响因子：
7.2
作者：
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影响因子：
7.4
作者：
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