Study on the Characterisitics and Formation MEchanisms of Combustion Exhaust Gas of Methanol Fuel

甲醇燃料燃烧废气特性及形成机理研究

• 批准号: 04832039
• 负责人: UETAKE Kazuya
• 金额: $ 1.47万
• 依托单位: NIHON UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04832039/
• 关键词: methanol fuel; environment & safety; exhaust gas; practical engine; model apparatus; ignition & combustion; formaldehyde; gas-phase radical; 燃焼反応実験装置; 燃焼排気ガス; 空燃比; スピントラッピング; アルコキシラジカル; アルキルラジカル; エンジン回転数; 噴射時間; スピントラップ

Characteristics and Formation MEchanisms of Combustion Exhaust Gas of MEthanol FuelAn attempted elucidation of the characteristics and formation mechanisms of combustion exhaust gas of methanol fuel was undertaken on the basic of the results obtained from the experimental combustion of methanol fuel by using a combustion reactor(a quarts glass flow reactor : model apparatus) and a practical engine under various condition of combustion.In addition, gas-phase radical sgenerated from the exhaust gas of methanol fuel were studied in detail using the electron spin resonance(ESR) spin-trapping technique. The exhaust gas was trapped with phenyl-N-t-butylnitron(PBN) 0.1mol/benzene solution, and its ESR spectrum was recorded at room temperature.The main results are follows.1. In the case of practical engine, it was found that average emissions of formaldehyde and unburned methanol constituted only little mass under the practical runiing(5-20ps) with higher temperature of exhaust tube. The close correlation was observed between the formation concentration of gas-phase radicals from combustion and the temperature of exhaust gas. The gas-phase radicals generated from combustion were found to be alcoxy radical and alkyl radical.2. In the case of model apparatus, it was found that ignition and combustion of methanol fuel occurred at about 470ﾟC of ignition temperature while the concentration of formaldehyde reached to the maximum amout, under producing gas-phase radicals. The gas-phase radicals were confirmed to be the same components as found in the practical engine.3. It can be concluded from the above that combustion reaction scheme of methanol fuel proceeds via alcoxy radical(RO) and the formation mechanism is attributable to the gas-phase radicals of combustion.

甲醇燃料燃烧废气的特性及形成机理根据甲醇燃料燃烧实验结果，对甲醇燃料燃烧废气的特性及形成机理进行了初步探讨（石英玻璃流动反应器：模型装置）和实际发动机在各种燃烧条件下的燃烧特性。此外，用电子自旋共振（ESR）自旋捕获技术对甲醇燃料尾气中气相自由基进行了详细的研究。用苯基-N-叔丁基硝酮（PBN）0.1mol/苯溶液捕集废气，在室温下记录其ESR谱，主要结果如下.在实际发动机的情况下，发现在排气管温度较高的情况下，实际运行（5- 20 ps）时，甲醛和未燃甲醇的平均排放量仅占很小的质量。燃烧产生的气相自由基浓度与排气温度有密切的相关性。燃烧产生的气相自由基主要是烷氧基自由基和烷基自由基.在模型装置中，甲醇燃料的着火和燃烧发生在着火温度470 ℃左右，甲醛浓度达到最大值，产生气相自由基。气相自由基的成分与实际发动机中发现的相同.由此可以得出结论，甲醇燃料的燃烧反应方案是通过烷氧基自由基（RO）进行的，其形成机理可归因于燃烧的气相自由基。