Application purpose of microchannel reactor in fuel cell system:
First of all, the traditional reactor is bulky, and the large amount of energy stored in the fuel processing equipment is very dangerous. Compared with the conventional reactor, the microchannel reactor is more than an order of magnitude smaller and has good safety. Therefore, it is suitable for automobiles. Or mobile power use;
Secondly, most of the current fuel cell vehicles use compressed hydrogen or liquid hydrogen, but there is no existing compressed hydrogen or liquid hydrogen supply station, and the micro-channel reactor can use the existing gas station or gas station, directly through chemical reaction The hydrocarbon fuel is converted into hydrogen and supplied to the fuel cell, so that there is no need to build any new compressed hydrogen or liquid hydrogen supply station. Based on the above two reasons, microchannel reactors have gradually received attention.
First, liquid gasoline or methanol evaporates into the vapor state in the evaporator; then enters the conversion reactor, through partial oxidation reaction (POX), steam reforming reaction (SR) or autothermal reforming reaction (ATR) to generate H2 and The mixed gas of CO; the mixed gas enters the water-gas reforming reactor, where CO is reacted; after that, the mixed gas of hydrogen and a small amount of residual CO enters the CO removal device to selectively further oxidize the CO to make the content reach the proton exchange membrane Below 10-5 required by the fuel cell; *After H2 enters the fuel cell for reactive power generation.
The microchannel fuel evaporator has a size of 9cm*10cm*3.8cm, a mass of 1.8kg, and a gasoline evaporation capacity of 260mL/min, which can provide fuel for a 50kW fuel cell fuel processing system. The working process of the evaporator is: the exhaust gas (containing 8% of H2) discharged from the anode of the fuel cell enters the catalytic plate on the upper part of the evaporator. Under the catalysis of Pd, the H2 undergoes oxidation reaction and releases heat to heat the exhaust gas, and then the exhaust gas enters the lower part. The micro-channel heat exchanger vaporizes the cold fluid (gasoline) on the other side of the heat exchanger.
The upper catalytic plate of the evaporator uses Ni as the basic material. There are 60 micropores on every 25.4mm (1in) Ni plate. After processing, the micropores are loaded with catalyst Pd. The Pd/Ni microporous structure makes the diffusion path of gas molecules much smaller than that of conventional systems using large-particle catalysts, thereby accelerating the exothermic reaction of H2 oxidation.
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