Experimental study on the heat and mass transfer characteristics of microchannel reforming reactors for hydrogen production
12 Pages Posted: 18 Aug 2022
Date Written: August 11, 2022
The heat and mass transfer performance of methanol steam reforming reactors is investigated numerically and experimentally. The heat of methanol combustion is used as the external heat source for the heat absorption of methanol reforming, and a staggered arrangement is design. The effects of carbon ratio, channel size, effective thermal conductivity, and layer thickness on the heat and mass transfer processes in methanol steam reforming reactors are evaluated. The critical thickness of the catalytic layer is determined, and the reforming reactor performance is discussed and analyzed. The results indicate that the design of the microchannel reforming reactor is basically restricted by the flow configuration. The critical layer thickness at which the diffusion becomes obvious is 0.8 mm. The optimum water-to-carbon feed ratio is 1.55:1 in terms of methanol conversion and hydrogen yield. The channel size significantly affects methanol conversion and hydrogen yield. The feed water carbon ratio plays a vital role in improving the overall efficiency of the microchannel reforming process. The hydrogen production is optimized by accurately controlling this parameter to ensure that the coking degree is minimized in the reforming process. In order to make the reforming process effective, excessively thick catalyst layer should be avoided. The thickness of the catalytic layer is adjusted to control the heat flow in the reactor and solve problems related to the heat balance in the reactor.
Keywords: Chemical reactors; Steam reforming; Transport phenomena; Fuel cells; Heat exchange; Hydrogen production
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