Steady-state characteristics of autothermal structures with fluidized-bed catalytic reactors

- Steady-state properties of various fluidized-bed autothermal structures are analyzed.
- Effect of an external heat exchanger and a flue-gas recycle is evaluated.
- The impact of thermal feedback onto autothermicity and multiplicity is analyzed.
- Feed preheating permits to extend the region of the autothermal operation.

The paper focuses on the analysis of steady-state properties of autothermal structures with a fluidized bed. The concept of autothermicity is discussed, and typical autothermal structures are presented. A method for the determination of the steady-states of such systems is described. Quantitative analysis of steady-states multiplicity is presented for two autothermal structures, that is a fluidized-bed reactor with an external heat exchanger, and with a partial recirculation of hot gases. A two-phase bubbling bed model is employed to describe quantitatively the behavior of the catalytic fluidized bed. The influence of selected design and operating parameters on steady-state characteristics is analyzed for two simple kinetic models. The effect of these parameter on the desired product yield is evaluated for the multiple-reaction process. The results obtained have both scientific and practical importance.

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