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FUEL AND AIR SUPPLY SYSTEM FOR COMBUSTION BASED POWER SOURCES. TRANSDUCERS 05 , Seoul, Korea, June 5-9, 2005. Daisuke Satoh, Shuji Tanaka and Masayoshj Esashi Department of Nanomechanics, Tohoku University. Speaker : C.M Lee Teacher : Cheng-Hsien Liu Date: 2007.6.6. Outline .

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fuel and air supply system for combustion based power sources

FUEL AND AIR SUPPLY SYSTEM FOR COMBUSTION BASED POWER SOURCES

TRANSDUCERS 05, Seoul, Korea, June 5-9, 2005

Daisuke Satoh, Shuji Tanaka and Masayoshj Esashi

Department of Nanomechanics, Tohoku University

Speaker : C.M Lee

Teacher : Cheng-Hsien Liu

Date: 2007.6.6

outline
Outline
  • Introduction
  • System and components
  • Simulation and Result
  • Conclusion
introduction
Introduction
  • Hydrocarbon fuels such as methanol and butane have much larger chemical energy density than electric energy density in existing batteries
    • direct methanol fuel cell (DMFC)
    • polymer electrolyte fuel cell (PEFC)
  • PEFC using hydrogen as a fuel has one order of magnitude higher power density compared to DMFCs
introduction1
Introduction
  • But !hydrogen is problematic in storage.
  • reforming hydrocarbons, storing hydrogen in metal hydride, high-pressure containers and carbon nanostmctures, and producing hydrogen from chemical hydrides
  • In this study, we have developed a fuel and air supply system for a combustor in a micro fuel reformer.
system and components
System and components
  • Fuel reforming system
    • micro valve and an ejector.
  • The valve regulates pressurized fuel gas
  • the ejector supplies air with the fuel to the combustor
  • In this study, iso-butane is used as a fuel
system and components micro valve
System and components (Micro valve)
  • Micro valve
    • largely-deformable corrugated diaphragm
    • two small electrostatic valves.
  • Design goal
    • low electric power consumption
    • low pressure loss
    • normally-closed operation for pressurized fuel.
micro valve
Micro valve
  • The corrugated diaphragm is actuated by the vapor pressure of liquid gas
  • The pressure to actuate the corrugated diaphragm is controlled by two small electrostatic valves
system and components ejector
System and components (Ejector)
  • The ejector is composed of a nozzle, a mixing section and a diffuser.
simulation and result
Simulation and Result
  • primary pressure and entrainment ratio which is defined as the ratio of the mass flow rate of the secondary flow to that of the primary flow.
conclusion
Conclusion
  • This paper described an ejector and a micro valve used in a fuel and air supply system for a micro combustor.
  • The CFD simulation of the ejector was performed
  • The pressure loss is as low as 11 Pa/sccm, and the electrostatic valve controlled butane with a pressure of 220 Wa at a driving voltage of 40 V.