科研之友
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摘要
The real world emissions from 14 State-V buses with four different after-treatment technologies are measured with portable emission measurement system. The results show that diesel oxidation catalyst can apparently reduce the CO emission of CNG-fueled buses, but its effect of reducing THC emission need to be improved. The CNG-fueled buses adopting EGR technology have a better emission reduction effects than diesel buses at low speed but there is no superiority at high speeds. The diesel buses with SCR system have lower CO and THC emissions but their NOx emissions are relatively high at low speeds, while the CNG-fueled buses with SCR system can effectively reduce NOx emission due to higher exhaust temperature, being the most ideal choice. The particulate matter mass emissions of CNG-fueled buses are far lower than diesel buses, but due to the effects of the way of dilution they emit more particles in nucleation mode.
