| CaSO4氧载体煤基合成气化学链燃烧模拟研究 |
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| 引用本文： | 王保文,晏蓉,郑瑛,赵海波,郑楚光.CaSO4氧载体煤基合成气化学链燃烧模拟研究[J].燃料化学学报,2011,39(4):251-257. |
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| 作者姓名： | 王保文 晏蓉 郑瑛 赵海波 郑楚光 |
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| 作者单位： | 1.State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
2.Institute of Environmental Science and Engineering, Nanyang Technological University, 637723, Singapore |
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| 基金项目： | National Natural Science Foundation of China(50906030,50936001); A Star SERC Grant of Singapore(SERC 0921380025-M47070019); partial funding from National Basic Research Program(2010CB227003,2011CB707301). |
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| 摘 要： | 相对于金属氧载体， CaSO4作为氧载体用于化学链燃烧，具有成本低、来源广泛和氧传递容量大等诸多优点，但是气相SO2以及各种固相硫沉积物对CaSO4用于化学链燃烧过程造成很大的障碍。基于热力学模拟，对CaSO4氧载体与以合成气为燃料的化学链燃烧进行了模拟研究，结果表明就CaSO4与合成气的反应而言，在燃料反应器中， 100℃～400℃的低温反应条件下，主要发生的是合成气中CO和H2的甲烷化反应以及硫酸盐热化学还原反应，反应产物主要是H2S和CaCO3；在400℃～915℃，主要发生的是CO和H2与CaSO4的还原反应，还原产物是CaS和CO2；当反应温度高于915℃时，诸多副反应开始发生，反应物相除了CaS和CO2外，CaO等副产物开始出现；而在空气反应器中，在CaS的整个氧化过程中，CaS再生形成CaSO4的反应都是主要的，但是当空气过量系数ФAR<0.8时，CaSO4与CaS的固相反应以及CaS氧化形成CaO的两个副反应也同时起作用。在燃料反应器中，最优的反应条件是反应温度915℃、常压并严格控制CaSO4 的加入量并确保CaSO4氧载体过量系数ФFR~1；而在空气反应器中，提供充足的空气量对于CaS的氧化非常重要，空气过量系数ФAR ≥1不仅能确保CaS的充分氧化，而且还能避免CaS氧化过程中SO2的排放和CaO的产生。
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| 关 键 词： | style="font-size: 9pt line-height: 化学链燃烧" target="_blank">150%">化学链燃烧 煤基合成气 氧载体 CaSO4 热力学模拟 /> |
| 收稿时间： | 2010-07-21 |
Simulated investigation of chemical looping combustion with coal-derived syngas and CaSO_4 oxygen carrier |
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| WANG Bao-wen,YAN Rong,ZHENG Ying,ZHAO Hai-bo,ZHENG Chu-guang.Simulated investigation of chemical looping combustion with coal-derived syngas and CaSO_4 oxygen carrier[J].Journal of Fuel Chemistry and Technology,2011,39(4):251-257. |
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| Authors: | WANG Bao-wen YAN Rong ZHENG Ying ZHAO Hai-bo ZHENG Chu-guang |
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| Institution: | WANG Bao-wen1,YAN Rong2,ZHENG Ying1,ZHAO Hai-bo1,ZHENG Chu-guang1(1.State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China,2.Institute of Environmental Science and Engineering,Nanyang Technological University,637723,Singapore) |
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| Abstract: | Compared to metal oxides,CaSO4 adopted as oxygen carrier(OC) in chemical looping combustion(CLC) presents several advantages such as low cost,easy availability and superior oxygen transfer capacity,whilst the SO2 emission and solid sulfur deposit in the process could be a big concern.In this study,thermodynamic simulations were conducted to investigate the sulfur distribution in a CLC system with CaSO4 as OC and syngas derived from coal as the fuel.Several findings were attained:(i) On the main products and... |
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| Keywords: | chemical looping combustion(CLC) coal-derived syngas oxygen carriers CaSO4 thermodynamic simulation |
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