A multi-scale dynamic two-dimensional heterogeneous model for catalytic steam methane reforming reactors

• Developed a rigorous dynamic heterogeneous multi-scale model for SMR reactor.
• Model can predict temporal and spatial variations in concentration and temperature.
• Results show catalyst core and tube wall temperature can peak by as much as 50 K.
• Model can be used for simulation, control, design and safety purposes.

A multi-scale, dynamic, two-dimensional, heterogeneous model for catalytic steam methane reforming (SMR) is developed. The model, derived from first principles, accounts for diffusional limitations for both mass and energy within large industrial-scale catalyst particles. The diffusional limitations have been incorporated, not by the conventional method of computing the effectiveness factor, but by accounting for the transfer of species as a function of the concentration and temperature gradients existing between the gas phase and catalyst surface along the reactor length. The model has been validated with available industrial steady-state data from literature. The model was then used to study the dynamic behaviour of key variables and the effects of feed disturbances on catalyst core and tube wall temperatures.