Abstract:
The effects of temperature, pressure and feed ratio on a CH
4 reformer were studied based on a kinetic model. The conversion rates of CH
4, H
2O and CO
2 all increased with the increase of temperature at
p=3.2 MPa. Compared with the steam reforming of CH
4, the reaction temperature of CH
4 and CO
2 reforming was higher and CO
2 began to transform at 650 ℃. The effect of temperature on the reaction rate of dry reforming of CH
4 was considerable with a relatively high reaction temperature and pressure. With the increase of pressure, the conversion rates of CH
4, H
2O and CO
2 decreased rapidly. When the pressure reached 3.5 MPa, the conversion rates of CH
4, H
2O and CO
2 reduced to less than 40%. However, the influence of pressure on
n(H
2)∶
n(CO) was minimal. The increase of CO
2 in the reaction system was beneficial for improving the conversion rate of CH
4, but significantly reduced the conversion rate of H
2O at
p=3.2 MPa. CO
2 conversion was enhanced rapidly at first and then remained stable with the increase of
n(CO
2)∶
n(CH
4). CH
4 and H
2O conversion were both increased with the increase of
n(H
2O)∶
n(CH
4). The results show that
n(H
2)∶
n(CO) can be optimized by adjusting the temperature and the relative concentration of H
2O and CO
2 in the feed gas to facilitate the subsequent industrialization.