Study On Methanol Steam Reforming Reactor For Hydrogen Production Based On Fish Scale Bionic Structure

Energy storage technology is an important direction for the development of the energy field in the future.Among many energy storage methods,thermochemical energy storage technology has the advantages of high energy density and long-time storage,which has the development prospect.Methanol steam reforming for hydrogen production is a highly developed thermochemical energy storage technology.Compared with methane steam reforming and ethanol steam reforming for hydrogen production,methanol steam reforming has lower reaction temperature and fewer by-products,which is considered as an ideal energy storage method.At present,the research of methanol steam reforming reactor is mainly focused on strengthening heat and mass transfer and miniaturization.Based on the above problems,in order to enhance the fluid disturbance in the flow field,this paper designed a fish-scale bionic structure micro-reactor.A three-dimensional model was established to compare with the traditional plate structure.The results showed that the fish-scale reactor could improve the methanol reforming performance.When the water-methanol ratio was 1.5,the reaction temperature was 250℃,and the inlet flow rate was 1.0 m/s,the methanol conversion of the fish scale structure was increased by about 8.98%compared to the plate structure,and the mole fraction of H2 in the outlet gas was increased by about 6.32%.Based on the proposed structure,the size parameters were studied,and the influence of the distance of the rotation axis,the length,and height of fish scales was analyzed.Combining with the field synergy theory,the influence of different characteristic sizes on the heat transfer process was analyzed through the temperature field synergy number and the pressure field synergy number.Combined with chemical reaction,the effect of characteristic size parameters on reforming performance was analyzed.The optimal size parameters were 0.5 mm distance from the axis of rotation,1.0 mm length,and 1.0 mm height of fish scales.By changing the arrangement of fish scale units and the position of the inlet and outlet of the reactor,the influence on heat transfer and chemical reaction were analyzed.The synergy number difference was less than 5,and the methanol conversion rate difference was less than 0.1%.Thermodynamic analysis of the reactor structure was carried out after adjusting the size parameters.The effects of temperature,water-methanol ratio,inlet flow rate,catalyst thickness,and porosity on the reaction performance were studied.The effect of methanol mass fraction synergy angle on the chemical reaction process was analyzed by combining the field synergy theory.Based on the above analysis,appropriate thermodynamic parameters were given.The proposed fish scale structure reactor was processed,and the experimental research on the performance of the reactor was carried out.The catalyst performance test platform and the microreactor performance test platform were built,and complete the commercial catalyst stability test.The methanol conversion rate could reach more than 30%within 48 hours.The catalyst was mounted on the surface of the fish scale structure by spraying,and the influence of thermodynamic parameters on the performance of the reactor was verified,and compared with the numerical simulation results.The maximum error of methanol conversion was about 10%,and the numerical results were in good agreement with the simulation results.