High-efficiency porous media combustor for minitype heat optoelectronic system

Abstract

The invention provides a high-efficiency porous medium burner used in a micro thermo photovoltaic system, relating to the technical field of combined combustion of a two-phrase gas. SiC ceramic spherules with diameter of 0.3mm to 0.35mm are filled in a shell of the burner in the form of oblique parallelepiped and then sintered with the shell to form a porous medium structure with porosity epsilon equal to 26 percent to 27 percent and a tail gas discharging channel is arranged on the external wall of the burner. The shell of the burner is processed first and then a bottom cover (3) of the burner is processed and sintered with the shell, and finally, in the interior of which the screened SiC ceramic spherules with diameter of 0.34mm are filled, after sintering, the porous medium structure is formed and the tail gas discharging channel is arranged in the interior of the shell (2) of the burner. The porous medium burner reduces the heat loss brought by increase of surface to volume ratio due to microscale, greatly improves the temperature distribution on the external wall of the burner, promotes combustion efficiency and combustion stability, lowers gas discharging temperature and heightens the temperature of the external wall, thus greatly advancing the efficiency of the whole micro thermo photovoltaic system.

Description

Technical field [0001] The present invention belongs to a two-phase gas mixed combustion technology, especially applied to the micro-thermal photoelectric system that requires pre-mixed combustion, by filling the combustion tube with ceramic balls of the same diameter to form a porous medium structure. Background technique [0002] With the increasing demand for small-sized, high-energy-density power sources, traditional batteries are no longer able to meet the needs, prompting people to develop micro-power devices or power MEMS (power MEMS). These systems use hydrogen or hydrocarbon as fuel, and are characterized by less than 1cm 3 It can output 1-20W power within the volume. According to the energy stored per unit mass and the power meter emitted per unit volume, the electric power generated by the combustion process has a huge advantage over the battery. The advantages of using hydrocarbon fuels also include low cost, stable voltage, and no memory effect. Therefore, relevant r...

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Problems solved by technology

It does not have any moving parts, and the electrical energy is generated by thermoelectric elements placed on the wall; but the complex three-dimensional structure of the opposite heat exchanger increases the difficulty of processing

[0004] In the common ordinary combustion chamber, because the residence time of the premixed gas in the micro-flame tube is too short, it cannot be fully burned inside, so the proportion of energy transferred by heat conduction and radiation on the wall of the flame tube is greatly reduced.

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