Design and optimization of solar energy driven Ni foam reactor for methane dry reforming
The solar energy driven methane dry reforming and conversion technology can convert CO2 and CH4 into fuel synergistically,which is an effective way to achieve solar energy storage and CO2 emission reduction.Because of its good thermal conductivity,high mechanical strength and gas permeability,the porous foam reactor has become a research hotspot in the large-scale energy application of solar energy driven methane dry reforming and conversion technology.The effect of inlet conditions on the reactor performance was studied by computational fluid dynamics simulation(CFD).The results show that the reaction performance is best when the total incident radiation is 130.8 W and inlet flow rate is 0.85 L/min,and the conversion rates of CH4 and CO2,and light-fuel efficiency are 79.73%,87.53%and 37.03%,respectively.The relationship between pore structure and reaction performance of uniformly porous Ni foam reactor("Ni foam reactor"for short)was studied by CFD coupled with genetic algorithm(GA).The results show that the reaction performance of the Ni foam reactor can be improved to a certain extent by increasing the porosity,and the reaction performance increases first and then decreases with the increase of the pore size.The Ni foam reactor(structure 3)with porosity of 0.93 and the pore size of 1.72 mm has the best reaction performance.The conversion rates of CH4 and CO2,and light-fuel efficiency are 83.55%,89.53%and 46.47%,respectively.Then,two optimization strategies for the design of Ni foam reactors with double gradient gradient aperture are proposed,namely,the gradient from large to small in the axial direction and from small to large in the radial direction(structure 1)and the gradient from large to small in both the axial and radial direction of the aperture(structure 2).Comparing with structure 3,structure 1 helps to penetrate the radiation while ensuring a higher temperature in the central region,and the light-fuel efficiency is 55.00%.And structure 2 contributes to the gradual absorption of solar energy,which in turn enhances temperature uniformity,with a light-fuel efficiency of 52.20%.
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