Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-III-4OPTIMIZATION AND SCALING UP OF THE RECIPROCAL FLOWREACTORS OF FILTRATION COMBUSTION FOR THE TASKS OFPARTIAL OXIDATION OF METHANE AND VOCS OXIDATIONK.V. Dobrego, I.A. KoznacheevHeat and Mass Transfer Institute, National Academy of Sciences of Belarus,15 P.Brovka Str., Minsk 220072, BelarusGas filtration combustion in a porous media [1] may be utilized for realization ofpractically important processes: hydrocarbons conversion to syngas, vent gas purification byVOCs oxidation, granular solids purification etc. Working parameters optimization andscaling up should be performed for practical implementation of the technology. The results ofnumerical investigation, optimization and scaling up of the reciprocal flow filtrationcombustion reactor (RFR), Fig. 1, for the tasks of methane partial oxidation and vent gasesoxidative purification are presented in this report.Methane conversion tosyngas in the reciprocal flowporous media reactor is one ofthe promising technologies [2]deservingintensiveinvestigation.An overall three-step sixcomponentchemical kineticsmodel is elaborated forFig. 1. Schematic of Reciprocal Flow Reactor.simulation of partial oxidationof methane in inert porous media. Procedure of the model adjusting to the experimental datais described. The applicability of the model to the tasks of methane conversion in the porousmedia is discussed.The influence of RFR scaling up (flow rate ranging from G=1 to 1000 m 3 /h) on the process ofpartial oxidation of methane in the filtration combustion reciprocal flow reactor is investigatednumerically. It is demonstrated that the residence time increase with the reactor length iscompensated by decrease of the maximum temperature. It is shown that the experimentallyobserved temperature growth saturation is caused by pressure growth in the reactor.The parametric study of the RFR (G=100 м 3 /ч) with reduced aspect ratio geometry isperformed. It is shown that given geometry provides better efficiency for the high flow ratesregimes, although the minimum length is determined by the limitations on front stability. Theoptimal fuel to air equivalence ratio providing maximum methane conversion ratio isdetermined Ф=2.7.309