Thermophotovoltaic Power Generation by Super-Adiabatic Combustion in Porous Quartz Glass

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A new thermophotovoltaic (TPV) power generation system was proposed on the basis of reciprocating-flow super-adiabatic combustion in a porous medium and investigated through numerical simulation and experiment. This system consists of a thin ceramic porous medium and two porous quartz glasses installed in an insulated flowing-duct. The porous quartz glass is made of five 6mm thickness porous plates that are piled with a small space between them. Air is supplied into the porous media ; where the flow direction reverses regularly. Fuel is injected into chambers between the central ceramic porous medium and the porous quartz glass for alternative combustion. Air is preheated by the upstream-side porous quartz glass. Then, the temperature reaches the maximum by combustion with fuel. The combustion gas enthalpy is stoted by the downstream-side porous quratz glass. The stored energy is regenerated into the enthalpy increase in air when the flow direction changes. By the energy recirculation, … More the temperature of the ceramic porous medium reaches 1500K when the combustion load is only 200W. Strong radiant energy of the entire region of wavelength is emitted from the ceramic porous medium. Of those, most of the radiation of a wavelength longer than 2.2 microns is absorbed by the porous quartz glass and is converted into the enthalpy increase in air. On the other hand, radiation of a wavelength range from a visible region to 2.2 microns passes through the porous quartz glass. Through experiment, it is disclosed that according to the optical properties of the quartz glass, most of the radiant energy of the short wavelength range is emitted from the system, while that of the long one is not so much. A 40% of the combustion heat is converted into the radiant energy of the wavelength range from the visible region to 2.2 microns. By a thermophotovoltaic (TPV) cell installed at both ends of the combustion system, a 30% of the radiant energy incident on the cell surface is converted into electric power. As a result, the total thermal effeciency from combustion heat to electric power reaches the value of 12% using only reciprocationg-flow combustion. Less