Abstract
This study presents a micro-power generation system based on porous combustion and gasification of biomass energy. The efficient heat exchange between porous combustion-based technology and a free-piston Stirling engine generator (FPSEG) was investigated to convert biomass energy into electric energy. Alumina ceramic particles were used to build a porous medium area within a heat transfer power generation experimental platform to explore the influence of the porous medium bed height and particle diameter, as well as the effect of inlet gas conditions on the system power generation performance. Specifically, the speed of power generation of the system increased and then decreased with an increase in the height of the bed, with maximal power generation speed observed when the height of the bed was 45 mm. The change in the alumina ceramic particle diameter was not significantly related to the rising speed of the system; however, when the diameter of the alumina ceramic particles was less than 15 mm, the flame front could not be stabilized in the porous medium, indicating that a critical particle size existed in the porous medium. Increased gas intake resulted in the power generation rate of the system to first increase and then decrease. When the gas intake was 9.3 m3/h, the power generation rate of change reached 1.2 W/s.
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