| 黄永仲.甲醇柴油双燃料发动机二氧化氮排放后处理方案研究[J].内燃机工程,2019,40(4):72-77. |
| 甲醇柴油双燃料发动机二氧化氮排放后处理方案研究 |
| Research on Aftertreatment Solution to Nitrogen Dioxide Emissions from a Diesel/Methanol Engine |
| DOI：10.13949/j.cnki.nrjgc.2019.04.011 |
| 关键词:柴油机 二氧化氮 甲醇 甲醛 柴油机氧化催化器 选择性催化还原 |
| Key Words:diesel engine nitrogen dioxide methanol formaldehyde diesel oxidation catalysts（DOC） selective catalytic reduction(SCR) |
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| 摘要:研究了柴油机氧化催化器（diesel oxidation catalysts，DOC）方案和选择性催化还原（selective catalytic reduction，SCR）与DOC的组合方案（SCR+DOC）对柴油机掺烧甲醇时排放的影响。试验结果表明，DOC促使NO2比例恢复至柴油机排放水平，且显著降低了甲醇排放，但对甲醛的净化效果不够理想；SCR+DOC方案在保持NO2比例处于柴油机常规水平的条件下，完全消除了双燃料发动机的甲醛和甲醇排放。针对各阶段NO2比例的变化现象，先后分析了燃烧温度和排气温度下相关可逆反应的标准吉布斯自由能变，阐明了各阶段的主要反应及进行方向。针对SCR+DOC方案促进甲醇完全氧化的可能原因，结合相关研究进行了讨论。 |
| Abstract:The effect of diesel oxidation catalyst(DOC) and its combination with selective catalytic reduction(SCR) system on NO2, formaldehyde and methanol emissions from a diesel/methanol engine was studied. Results show that the use of DOC in the dual fuel engine can make NO2 ratio reach the level of general diesel emissions and significantly reduce methanol emissions, but does not ideally purify formaldehyde. Under the condition of maintaining the conventional NO2 ratio level of diesel-engines, the SCR+DOC scheme can completely eliminate the formaldehyde and methanol emissions from the dual fuel engine. According to the variation of NO2 ratio in each stage, the standard Gibbs free energy change of the relevant reversible reaction at combustion temperature and exhaust temperature has been analyzed successively, and the main reactions and directions of each stage were clarified. Moreover, the possible reasons for the complete oxidation of methanol by the SCR+DOC scheme were also discussed together with related studies. |
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