Mathematical Simulation On Reactor For Methanation Of Syngas

The system for methanation of syngas was simulated in this paper. The one dimensional pseudo-homogenous mathematical model of methanation adiabatic fixed bed reactor was established with taking methanation of CO and CO2as the independent reactions, and taking CO2and CH4as the key components. The adiabatic multi-bed gas recycle reactor for methanation of syngas was simulated under the operating conditions which are summarized as follows:the feed flow rate26.90kmol·h-1, CH40.1188, CO0.0879, CO20.1032, H20.6498, H2O0.00, N20.0396, the recycle ratio2.053, the inlet pressure of first methanation reactor2.741MPa, the inlet temperature of three reactors:290℃;345℃and257℃. The comparison between simulated results and experimental data showed a good accuracy in the simulated model. The gas concentration profiles were obtained.The influences of many operating conditions were studied based on the above mathematical model. It demonstrated that:there is no significant influence in model system by the ratio of CO/CO2(9-15) of feed. CO2conversion increased with the increasing of the ratio of (H2-CO2)/(CO+CO2) from2.8to3.2, but the temperature profiles of reactors almost unchanged. The change of feed flow rate (20kmol·h-1～40kmol·h-1), methane content (0%～20%), water content (0%～10%), inlet temperature, inlet pressure (1MPa-4MPa) and recycle ratio (1～3) main influenced the first and second methanation reactor temperature profiles and product distribution, while they had little impact on the feedstock conversion and the outlet CH4concentration.