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

PP-III-4The influence of the water vapor addition to the methane – air mixture on the conversionratio and hydrogen concentration is investigated, Fig. 2. It is shown that hydrogenconcentration in the gas obtained may be increased by 0.5-1 percent and the methaneconversion ratio may be improved by 10-15 % by adding steam to a working mixture. Theoptimum equivalence ratio remains the same as in the water free case. The steamconcentration, that maximizes H 2 differs from that which maximize the conversion ratio.Some intermediate concentration may be recommended for practical operation depending ontechnological requirements.28X H2, %272625242322216543211 - G=0.3 kg/m 2 /s2 - G=0.43 - G=0.54 - G=0.75 - G=1.06 - G=1.33R CH4-H2, %90858075706560551 - G=0.3 kg/m 2 /s2 - G=0.43 - G=0.54 - G=0.75 - G=1.06 - G=1.33123456200,00 0,05 0,10 0,15 0,20 0,25 0,30X H2O, mol/mol500,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40X H2O, mol/molFig. 2. Hydrogen output concentration (left graph) and methane conversion ratio (right graph) as a function ofadded water. The specific mass flow rates are given in the legend. The dashed line joins maxima. Ф=3.Another task explored in the work is VOCs oxidation in the RFR. The critical questionfor the application of this technology is lean combustibility limit (LCL): LCL determinationand extension [3,4]. Analytical and numerical investigation of the LCL for the extra leanmethane –air mixture in the reciprocal flow filtration combustion reactor is performed. Newquantitative results on LCL dependence on the reactors length, porous media porosity, packedbed particles size, thermal insulation and other parameters are reported. Simulation show thatpacked bed particles size is the most important parameter determining LCL, while thepressure plays a negligible role.References1. K.V. Dobrego, S.A. Zhdanok, Physics of filtration combustion of gases. (in Russian) HMTI Publ., Minsk2002.2. Drayton M.K., Saveliev A.V., Kennedy L.A., Fridman A.A, Li Y.E., Superadiabatic partial oxidation ofmethane in reciprocal and counterflow porous burners, Proceedings of The 27-th Symp. (Int.) onCombustion. Pittsburg. PA, 1998. P.1361-1367.3. K. Hanamura, R. Echigo, S.A. Zhdanok, Superadiabatic combustion in porous media. IJHMT V.36(13).19993. P.3201-3209.4. K.V. Dobrego, N.N. Gnezdilov, I.M. Kozlov, V.I. Bubnovich, H.A. Gonzalez, Numerical investi-gation ofthe new Regenerator-recuperator scheme of VOC oxidizer // Int. Journal of Heat and Mass Transfer, V.48,Issues 23-24, 2005, P. 4695-4703.310