Effects of Pyrolysis Atmosphere and Temperature on Coal Char Characteristics and Gasification Reactivity
Effects of Pyrolysis Atmosphere and Temperature on Coal Char Characteristics and Gasification Reactivity
复制标题
热解气氛和温度对煤焦特性和气化反应活性的影响
DOI：
10.1002/ente.201500366
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发表时间：
2016-04
影响因子：
3.8
通讯作者：
Kefa Cen
中科院分区：
文献类型：
--
作者：
Qinhui Wang;Rui Zhang;Zhongyang Luo;Mengxiang Fang;Kefa Cen
煤焦在工业生产中通常是在复杂气氛下生产的。然而，大多数关于煤焦特性和气化反应性的研究都是使用在惰性气氛下制备的煤焦样品。研究了热解气氛和温度对煤焦特性和气化反应性的影响。在鼓泡流化床中对山西某烟煤进行了热解，制备了半焦样品。采用氢气（H2）、二氧化碳（CO2）、一氧化碳（CO）和甲烷（CH 4）的混合物作为模拟热解气体（SPG）。煤分别在SPG和N2气氛中热解。利用SEM、拉曼光谱和傅里叶变换红外光谱研究了热解气氛和热解温度对煤焦特性的影响。采用改进的热重分析（TGA）系统测定了煤焦-H2O和煤焦-CO2气化反应活性。实验结果表明，SPG气氛对煤焦的形貌没有明显影响，但对煤焦的碳结构和表面化学基团有显著影响。SPG半焦样品具有较低的气化反应性。CO的歧化反应、CH 4的分解反应以及H2引起的含氧结构的损失导致煤焦的有序度提高，并且歧化反应和分解反应生成的石墨降低了煤焦的比表面积。这两个原因导致SPG半焦气化反应活性较低。
Coal chars are usually produced under complex atmospheres in industrial production. However, most of the research about char characteristics and gasification reactivity uses the coal char samples prepared under an inert atmosphere. In this study, the influences of the pyrolysis atmosphere and temperature on coal char characteristics and gasification reactivity were investigated. A Shanxi bituminous coal was pyrolyzed in a bubbling fluidized bed to produce char samples. A mixture of hydrogen (H2), carbon dioxide (CO2), carbon monoxide (CO), and methane (CH4) was used as simulated pyrolysis gas (SPG). The coal was pyrolyzed in the SPG and N2 atmospheres, respectively. SEM, Raman spectroscopy, and FTIR spectroscopy were used to study the influences of the pyrolysis atmosphere and temperature on the coal char characteristics. The char–H2O and char–CO2 gasification reactivities were measured by using a modified thermogravimetric analysis (TGA) system. The experimental results indicate that the SPG atmosphere has no obvious influence on the coal char morphology, but it has significant influences on the carbon structures and surface chemical groups. The SPG char samples have lower gasification reactivity. The disproportionation reaction of CO, the decomposition reaction of CH4, and the loss of oxygen-containing structures induced by H2 lead to a higher-ordered degree of char, and the graphite generated from the disproportionation reaction and the decomposition reaction can decrease the specific surface area of the coal char. These two reasons result in the lower gasification reactivity of SPG char.
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影响因子：
7.4
作者：
Shiyong Wu;Sheng Huang;Liyuan Ji;Youqing Wu;Jinsheng Gao
通讯作者：
Shiyong Wu;Sheng Huang;Liyuan Ji;Youqing Wu;Jinsheng Gao
影响因子：
7.4
作者：
D. M. Keown;J. Hayashi;Chun-Zhu Li
通讯作者：
D. M. Keown;J. Hayashi;Chun-Zhu Li
甲烷催化裂化生产氢气和石墨纳米碳（纳米管、微纤维、微球、洋葱），零排放
DOI：
10.1080/15533174.2013.797452
发表时间：
2014-03
影响因子：
--
作者：
Cui, Jiali;Li, Yuzhen;Gao, Lili;Zhang, Sanyuan
通讯作者：
Zhang, Sanyuan
影响因子：
11.4
作者：
P. Fu;Song Hu;L. Sun;J. Xiang;Tao Yang;Anchao Zhang;Junying Zhang
通讯作者：
P. Fu;Song Hu;L. Sun;J. Xiang;Tao Yang;Anchao Zhang;Junying Zhang
影响因子：
5.3
作者：
J. Fermoso;M. V. Gil;S. García;C. Pevida;J. J. Pis-J.;F. Rubiera
通讯作者：
J. Fermoso;M. V. Gil;S. García;C. Pevida;J. J. Pis-J.;F. Rubiera