Simulation of Methane Catalytic Bi-Reforming Process

The effects of temperature, pressure and feed ratio on a CH₄ reformer were studied based on a kinetic model. The conversion rates of CH₄, H₂O and CO₂ all increased with the increase of temperature at p=3.2 MPa. Compared with the steam reforming of CH₄, the reaction temperature of CH₄ and CO₂ reforming was higher and CO₂ began to transform at 650 ℃. The effect of temperature on the reaction rate of dry reforming of CH₄ was considerable with a relatively high reaction temperature and pressure. With the increase of pressure, the conversion rates of CH₄, H₂O and CO₂ decreased rapidly. When the pressure reached 3.5 MPa, the conversion rates of CH₄, H₂O and CO₂ reduced to less than 40%. However, the influence of pressure on n(H₂)∶n(CO) was minimal. The increase of CO₂ in the reaction system was beneficial for improving the conversion rate of CH₄, but significantly reduced the conversion rate of H₂O at p=3.2 MPa. CO₂ conversion was enhanced rapidly at first and then remained stable with the increase of n(CO₂)∶n(CH₄). CH₄ and H₂O conversion were both increased with the increase of n(H₂O)∶n(CH₄). The results show that n(H₂)∶n(CO) can be optimized by adjusting the temperature and the relative concentration of H₂O and CO₂ in the feed gas to facilitate the subsequent industrialization.