Experimental and kinetics investigations of separated-gasification chemical looping combustion of char with an iron ore as the oxygen carrier
Experimental and kinetics investigations of separated-gasification chemical looping combustion of char with an iron ore as the oxygen carrier
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以铁矿石为氧载体的焦炭分离气化化学循环燃烧实验及动力学研究
DOI：
10.1016/j.fuproc.2020.106554
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发表时间：
2020-12
影响因子：
7.5
通讯作者：
Baosheng Jin
中科院分区：
文献类型：
--
作者：
Xiaojia Wang;Yutong Gong;Xudong Wang;Baosheng Jin
以煤焦为燃料，在实验室两段反应器系统上研究了分离气化化学链燃烧（SG-CLC）的反应特性和化学动力学。结果表明，在气化反应器（GR）中发生的煤焦缓慢气化反应与在还原反应器（RR）中发生的氧载体（OC）和气化产物的快速氧化还原反应之间存在着巨大的反应速率失配。因此，建议GR在950 °C以上操作，以在15分钟的反应时间下获得高于90%的碳转化率，而900 °C对于具有理想气体燃烧效率（>99%）的RR应该是足够的。此外，SG-CLC中的有机碳具有良好的循环稳定性，这是由于有机碳与半焦之间的间接混合，有效地避免了灰分中的钾盐在有机碳表面的附着。此外，确定了反应动力学模型，获得了以木炭为燃料的SG-CLC的动力学参数。一级动力学模型、二维收缩模型和三维收缩模型的表观活化能分别为154.44、149.79和161.42 kJ/mol。
This study presents the results obtained from a lab-scale two-stage reactor system to investigate the reaction characteristics and chemical kinetics of separated-gasification chemical looping combustion (SG-CLC) with a coal char as the fuel. The results have shown that there is huge mismatch of reaction rate between the slow gasification of char occurred in the gasification reactor (GR) and the rapid redox reactions of oxygen carrier (OC) and gasification products occurred in the reduction reactor (RR). Hence, the GR is recommended to be operated over 950 °C for a carbon conversion higher than 90% at the reaction time of 15 min, while 900 °C should be enough for the RR with an ideal gas combustion efficiency (>99%). Besides, the OC in SG-CLC shows favorable cycle stability, which can be attributed to the indirect mixing between the OC and char so that the attachment of potassium salt from the ash to the OC surface can be effectively avoided. In addition, the reaction kinetics models are determined to obtain the kinetics parameters of the char-fueled SG-CLC. The apparent activation energy is found to be 154.44, 149.79 and 161.42 kJ/mol for the first-order Kinetics Model, 2-D Contraction Model, and 3-D Contraction Model, respectively.
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影响因子：
4.2
作者：
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DOI：
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发表时间：
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影响因子：
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