Study On Reforming Process Of Methane-Rich Gas

Aiming at the currently prominent environmental problem in China, it is not conforming to the development of government by using large coal and oil as an energy source. So the clean methane energy is concerned by human. Especially carbon dioxide reforming of methane for syngas has good environmental benefits and economical benefits, but the problems of carbon deposit is standing out, so the industrialization of this technology cannot be achieved. The direction of the research by many scientists is to improve the catalyst performance of coke formation, however it is still in the experimental stage.In this article, considering the reaction performance of carbon dioxide reforming may be improved by using the advantages of partial oxidation and stem reforming of methane, thus the methane carbon dioxide reforming, methane carbon dioxide with oxygen reforming and methane tri-reforming are chosen as research systems. In this experiment, the Ni/MgAl2O4catalyst used is the same, the reforming process of methane is simulated by combination of WFSM-3060catalyst evaluation device and sp-6890gas chromatography. The effect of reaction temperature, feed ration and space velocity on the reaction performing of methane reforming is investigated in this unit. According to the result of conversion and selectivity, the experiment rules are summarized and the reasons are analyzed. At last, the experiment results of each methane reforming systems will be further analyzed, the favorable conditions and the adverse factors for reaction performance of methane reforming are be concluded. The main conclusions are as follows:(1) Through the research of process conditions on carbon dioxide reforming of methane, CH4and CO2conversion increase with the growth of reaction temperature, but CO and H2selectivity reduce. As the using time of catalyst extends, the higher the temperature is, the faster the performance indexes decline, it is a state that high temperature is not good for carbon dioxide reforming of methane.With the growth of CH4/CO2ration, CH4conversion and CO selectivity reduce, CO2conversion and H2selectivity increase. The conversion and selectivity reduce with the growth of space velocity, it shows that the effect of space velocity on slow reaction of methane carbon dioxide reforming is obvious. The value of VH2/Vco from syngas prepared by carbon dioxide reforming of methane is mainly less than1, only when the CH4/CO2ration is higher.(2) Through the research of process conditions on carbon dioxide with oxygen reforming of methane, CH4and CO2conversion increase with the growth of reaction temperature, especially the reactant conversion has obviously improved under low temperature than carbon dioxide reforming of methane, it shows that the addition of oxygen benefits to the raise of the reactant conversion. However conversion and selectivity are still dropping quickly at high temperature with the continue of reaction, the stability of reforming system is also poor.With the growth of CO2/O2ration, CH4conversion and the value of Vic/Vco reduce, CO2conversion, CO and H2selectivity increase. When the space velocity grows, CH4and CO2conversion decline rapidly, but the H2and CO selectivity increase.(3) Through the research of process conditions on methane tri-reforming, reactant conversion gradually increases with the growth of reaction temperature, but CO selectivity and the value of Vh2/Vco reduce. When the temperature is1073K, the reactant conversion still drop after catalyst is used12hours, but the range declined is significantly weaker than the other two reforming systems, it shows that carbon elimination effect by adding water vapor is relieved, while the high reactant conversion retains.With the increase of O2/H2O ration, the value of Vm/Vco, CH4and CO2conversion increase, but CO selectivity reduces. When the space velocity improves, CH4and CO2conversion reduces, however the CO selectivity increases.