Investigations of the Effect of Humid Air on NOX & PM Emissions of a CNG Engine [Research Brief]

Details

• Creators:
  Rahai, Hamid R.
• Corporate Creators:
  California State University, Long Beach. Center for Energy and Environmental Research and Services (CEERS) ; METRANS Transportation Center (Calif.)
• Corporate Contributors:
  United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
• Subject/TRT Terms:
  • Carbon dioxide
  • Compressed natural gas
  • Exhaust gases
  • Humidity
  • Mathematical models
  • Natural gas vehicles
  • Nitrogen oxides
  • Particulates
  • Simulation
• Resource Type:
  Brief
• Geographical Coverage:
  United States
• Corporate Publisher:
  METRANS Transportation Center (Calif.)
• Abstract:
  The goal of the investigation was to determine the feasibility of using a humid air system for reducing NOx emissions of CNG engines. Humid air system or fumigation has been an effective approach in reducing diesel NOx emissions. In this method, water vapor is injected in the intake air supplied to the engine cylinders. The process reduces the local temperature in the cylinder and raises the specific heat of the air-fuel mixture which also contributes to the elimination of the hot spots in the engine's cylinders. With decreased temperature, NOx reduction is achieved. With an optimized system, fumigation could reduce NOx emissions without significant increases in hydrocarbon emissions. Other benefits of this process include longer life of the engine components due to reduced cycle temperature and reductions in carbon deposits.
• Format:
  PDF
• Funding:
  65A0533
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/67589/dot_67589_DS1.pdf
• File Type:
  [PDF - 460.80 KB]
• Collection(s):
  University Transportation Centers
• Main Document Checksum:
  urn:sha256:ed3308cdba26b1ea4fed013d72e634c0982490ca39e48fb4ed072796c73d2f1c