An investigation of the chemical kinetics of biogas combustion
An investigation of the chemical kinetics of biogas combustion
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DOI：
10.1016/j.fuel.2015.01.085
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发表时间：
2015-06-15
期刊：
影响因子：
7.4
通讯作者：
Jiang, X.
中科院分区：
文献类型：
--
作者：
Fischer, M.;Jiang, X.
生物气体（含CH4， CO2和可能的H-2）燃烧的化学动力学方面已经进行了研究。考虑了5种反应机理，并对激波管中H-2-CO2-O-2和CH4-CO2-O-2混合物的点火延迟时间进行了测试。虽然GRI（气体研究所）机制3.0无法重现第一组测量结果，但它为第二组直接与沼气相关的测量结果提供了最佳匹配。因此，它被用来预测在相同条件下产生的CO和NO的量。研究发现，对于化学计量混合物和稀薄混合物，在较高温度下，初始CO2浓度的增加降低了NO的生成，提高了CO的生成。对于丰富的混合物，一氧化氮的产生要小得多，并且不遵循这个简单的模式。在动力学上，H + CO2 -> OH + CO反应在CO2存在下起着更大的作用，因此必须准确地知道。在某些条件下，会产生对环境有问题的一氧化二氮。利用GRI 3.0预测了加氢对沼气的影响。与不加氢的混合物相比，加入2%的H-2总是提高产生的CO的浓度。在p = 1 bar时，随着H-2浓度的增加，NO的生成增加，而在p = 10 bar时，NO的生成减少。总的来说，本研究支持gri机制模拟沼气燃烧的可行性。(C) 2015 Elsevier Ltd.版权所有。
Chemical kinetic aspects of the combustion of biogas (containing CH4, CO2 and possibly H-2) have been investigated. Five reaction mechanisms were considered and tested with respect to the ignition delay times of H-2-CO2-O-2 and CH4-CO2-O-2 mixtures measured in shock tubes. While the GRI (Gas Research Institute) mechanism 3.0 could not reproduce the first set of measurements, it brought up the best match for the second one directly relevant to biogas. Consequently it was employed for predicting the amounts of CO and NO produced under the same conditions. It was found that for stoichiometric and lean mixtures an increase in the initial CO2 concentration lowers the production of NO and raises that of CO at higher temperatures. For rich mixtures, the production of NO is far smaller and does not follow this simple pattern. Kinetically, the reaction H + CO2 -> OH + CO plays a greater role in the presence of CO2 and must hence be accurately known. For some conditions, the environmentally problematic N2O is produced. The effects of hydrogen addition on biogas have also been predicted using GRI 3.0. The addition of 2% of H-2 always raises the concentration of produced CO when compared to the mixture without hydrogen. The formation of NO is increased for higher H-2 amounts at p = 1 bar but decreased at p = 10 bar. Overall, the present study supports the viability of the GRI-mechanism for the simulation of biogas combustion. (C) 2015 Elsevier Ltd. All rights reserved.