The combustion of methane on platinum—alumina fibre catalysts—II design and testing of a convective-diffusive type catalytic combustor.
✍ Scribed by D.L. Trimm; Chi-Wai Lam
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 779 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
A convectlve-dfiusrve catalytic combustor has been used to study the total oxldatlon of methane over a platmum on alumma libre catalyst Temperature profiles across and through the catalyst pad have been measured as a fun&on of methane feed rate, as has the radmnt energy and the gas composition near the pad Carbon cboxlde and water were the only detectable products of reaction The results have been compared with the predlctlons of a one d~mens~onal-one phase model Good agreement was obtamed with expenmental results, except near to the edge of the combustor tlus IS probably due to small maccuracles m the thermal conductlvlty vties used The model has been used to predict the behavlour of a combustor as a function of variables m the system The combustor performance IS found to depend upon a balance between deerent effects Heat generatIon depends on the rate of chemical reaction, and an Increased feed rate of methane may (a) Increase the rate by mcreasmg the concentration of methane (b) decrease the rate by hmltmg the dtiuslon of au from the other srde of the pad or (c) result m increased methane slippage by reducmg the contact time m the pad Varymg packmg density has a simdar effect, with the added problem that radiation (heat recovery) IS also affected by the density of fibres It IS shown that only ca 30% of the fibre pad radiates sgmficantly As a result, although the tlnckness of the bed Increases the mternal bed temperature, It has ltttle effect on heat recovery