Full load performance and emission characteristics of hydrogen-compressed natural gas engines with valve overlap changes
Full load performance and emission characteristics of hydrogen-compressed natural gas engines with valve overlap changes
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DOI：
10.1016/j.fuel.2014.01.041
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发表时间：
2014-05
期刊：
影响因子：
7.4
通讯作者：
Cheolwoong Park;S. Lee;Gihun Lim;Y. Choi;Chang-gi Kim
中科院分区：
文献类型：
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作者：
Cheolwoong Park;S. Lee;Gihun Lim;Y. Choi;Chang-gi Kim
天然气汽车发动机优于柴油发动机，因为它们释放的氮氧化物（NOx）和二氧化碳排放量显著较低。氢气压缩天然气（HCNG）技术是一种很有前途的替代传统压缩天然气发动机的技术，因为氢气具有稳定的稀薄燃烧特性。虽然满足NOx排放要求，但甲烷排放必须使用氧化催化剂过滤。由于提高甲烷的转化效率是昂贵的，因此需要一种用于甲烷还原的替代方案。在这项研究中，改变气门重叠的策略，以减少甲烷排放。虽然扭矩阀不能满足发动机排放规范，但通过减少阀重叠持续时间，同时使用HCNG燃料，碳氢化合物和甲烷排放减少了约41%。氮氧化物排放水平大致相当于或略高于传统的凸轮轴。
Natural gas vehicle engines are preferred over diesel engines because they release significantly lower amounts of nitrogen oxides (NOx) and carbon dioxide emissions. Hydrogen-compressed natural gas (HCNG) technology is a promising alternative to that used in conventional compressed natural gas engines because hydrogen possesses stable lean combustion characteristics. Although the NOxemissions requirements are satisfied, methane emissions must be filtered using an oxidation catalyst. An alternative is required for methane reduction because improving the conversion efficiency of methane is expensive. In this study, the strategy of varying the valve overlap was employed to reduce methane emissions. Although a torque valve cannot meet engine emission specifications, the hydrocarbon and methane emissions were reduced by approximately 41% by decreasing the valve overlap duration while using HCNG fuel. The level of NOxemissions was approximately equivalent to or slightly higher than that of a conventional camshaft.