FUEL AND AIR SUPPLY SYSTEM FOR COMBUSTION BASED POWER SOURCES - PowerPoint PPT Presentation

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FUEL AND AIR SUPPLY SYSTEM FOR COMBUSTION BASED POWER SOURCES

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The corrugated diaphragm is actuated by the vapor pressure of liquid gas. The pressure to actuate the corrugated diaphragm is controlled by two small ... – PowerPoint PPT presentation

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Title: FUEL AND AIR SUPPLY SYSTEM FOR COMBUSTION BASED POWER SOURCES


1
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

2
Outline
  • Introduction
  • System and components
  • Simulation and Result
  • Conclusion

3
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

4
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.

5
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

6
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.

7
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

8
System and components (Ejector)
  • The ejector is composed of a nozzle, a mixing
    section and a diffuser.

9
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.

10
Simulation and Result
11
Simulation and Result
12
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.
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