天然气掺氢发动机燃气供给系统设计与试验研究

提出了将滑动弧电解制氢装置应用到天然气发动机中，通过电解天然气制氢，轻松实现天然气（CNG）发动机到天然气掺氢（HCNG）发动机的改装。通过自制装置，进行了过量空气系数和点火提前角与燃用不同掺氢比例的HCNG对发动机排放特性影响的试验研究。结果表明，发动机燃用HCNG，其HC和CO的排放都减少，NOx排放量增加，但随着过量空气系数的增加或点火提前角的减少，NOx排放会大大减少，排放性能得到优化。同时进行了体积掺氢比20%的HCNG和纯CNG外特性对比试验研究，结果表明，相比纯CNG，燃用掺氢20%HCNG后，其动力性变化不大，燃料消耗率却相应的减少，经济性得到改善。

Design of Hydrogen Enriched Compressed Natural Gas Engine Fuel System and Test Research

This paper put forward a device installed into the fuel system, which used the sliding electric arc to electrolyze the natural gas to make hydrogen and then blend them into the fuel pipe for final combustion. We could re-equip the compressed natural gas (CNG) engine to hydrogen enriched compressed natural gas (HCNG) engine easily. The test research of the engine emissions characteristics using different hydrogen-CNG ratios was conducted when the excess air ratios and the spark advance angles were different. The results show that HC and CO emissions of engine fueled with HCNG reduce when NOx emissions increase. The NOx emissions are reduced greatly with the increase of the excess air ratio or the decrease of the spark advance angle. Comparative experiments of the performance characteristics of engine burned with HCNG whose volume hydrogen-CNG ratio was 20% and CNG were conducted under wide open throttle operating conditions. The results show that the torque output is unchanged when 20%HCNG is burned compared with CNG engine, but the fuel consumption is reduced and the fuel economy is improved.