Development Of A Small Integrated Methanol Hydrogen Production Tube Reactor

Hydrogen energy is currently a hot clean energy source,but the difficulty of hydrogen storage and transportation has limited its development.To solve this problem,many on-site hydrogen production technologies have received extensive attention.Methanol steam reforming is one of the more promising on-site hydrogen production technologies.However,most of the current researches on methanol steam reforming hydrogen production reactors are focused on micro-reactors or industrial large-scale reactors.The research on small-scale reactors is still simulate.Therefore,this paper predicts the development of a miniaturized tubular hydrogen production reactor.This paper designed and researched the methanol steam reforming jacketed hydrogen reactor through experiments and numerical simulations.The main contents and conclusions are summarized as follows:(1)A casing reactor is designed and a corresponding experimental platform is set up.The sleeve-type reactor is applied to a car engine,and the hydrogen produced by the reactor is used by the engine for combustion work,and the high-temperature exhaust gas discharged from the engine is used to heat the evaporator and the reactor.Experiments show that compared with counter-current heat transfer,forward-flow heat transfer can improve the uniformity of temperature distribution in the reactor on the premise that methanol has a higher conversion rate.(2)A COMSOL model of a jacketed reactor was established to simulate the reaction kinetics of methanol steam reforming to produce hydrogen.Experimental data was used to verify the validity of the COMSOL model.Simulation results show that the temperature distribution inside the jacketed reactor is not uniform,and there is a"cold spot"of temperature,which results in a low methanol conversion rate.(3)In order to overcome the temperature"cold spot"problem of the jacketed reactor,a double jacketed reactor was designed,and the methanol conversion rate,the amount of hydrogen at the outlet,and the heat transfer efficiency of the reactor were studied.The results show that compared with the traditional sleeve reactor,the double sleeve reactor has a significant improvement in heat transfer performance and reaction performance.The optimized double jacketed reactor can maintain a methanol conversion rate of more than 85%and a hydrogen production rate of 4.18 m~3/hr when the methanol feed is 4 L/hr.