Kinetics filtration combustion

Theoretical analysis of the problem (Aldushin et ai, 1974, 1975) shows that combustion wave propagation can occur for incomplete conversion of the solid reactants. Whether full conversion is achieved can be estimated by the dimensionless parameter, co = UJvf, the ratio of the kinetically controlled combustion velocity (I/k), and gas filtration (Vf) rates. The former can be calculated from Eq. (57), while the latter can be calculated as follows ... 

Ivleva, T. I., and Shkadinskii, K. G., Mathematical modeling of two-dimensional problems in filtration combustion of condensed systems. Proceedings of the Kinetics and Mechanisms of Physicochemical Processes, Chernogolovka, Russia, 74 (1981). 

Step 4 Define the System Boundaries. This depends on the nature of the unit process and individual unit operations. For example, some processes involve only mass flowthrough. An example is filtration. This unit operation involves only the physical separation of materials (e.g., particulates from air). Hence, we view the filtration equipment as a simple box on the process flow sheet, with one flow input (contaminated air) and two flow outputs (clean air and captured dust). This is an example of a system where no chemical reaction is involved. In contrast, if a chemical reaction is involved, then we must take into consideration the kinetics of the reaction, the stoichiometry of the reaction, and the by-products produced. An example is the combustion of coal in a boiler. On a process flow sheet, coal, water, and energy are the inputs to the box (the furnace), and the outputs are steam, ash, NOj, SOj, and CO2. 

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