Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Engineering
Homogeneous Vs. Catalytic Combustion Of Lean Methane—Air Mixtures In Reverse-Flow Reactors, Krzysztof Gosiewski, Yurii Sh. Matros, Krzysztof Warmuzinski, Manfred Jaschik, Marek Tanczyk
Homogeneous Vs. Catalytic Combustion Of Lean Methane—Air Mixtures In Reverse-Flow Reactors, Krzysztof Gosiewski, Yurii Sh. Matros, Krzysztof Warmuzinski, Manfred Jaschik, Marek Tanczyk
Krzysztof Gosiewski
To carry out a comparative assessment of a recently proposed idea of using thermal flow-reversal reactors (TFRR) for mine ventilation air, the results for the catalytic flow-reversal reactor (CFRR) investigated within the European Project (2003) are briefly presented. Next, experimental investigations of thermal combustion are presented in this paper. These consisted of the kinetic study of homogeneous combustion in the pelletized bed and in the monolith. Kinetic equations for the two cases are derived and discussed. Experimental autothermal reverse-flow operation in a laboratory setup was performed. Due to the high heat capacity of the wall and insulation of the pelletized …
Effect Of The Mode Of Heat Withdrawal On The Asymmetry Of Temperature Profiles In Reverse-Flowreactors. Catalytic Combustion Of Methane As A Test Case, Krzysztof Jan Gosiewski, Krzysztof Warmuzinski
Effect Of The Mode Of Heat Withdrawal On The Asymmetry Of Temperature Profiles In Reverse-Flowreactors. Catalytic Combustion Of Methane As A Test Case, Krzysztof Jan Gosiewski, Krzysztof Warmuzinski
Krzysztof Gosiewski
Results of simulations are presented concerning a reverse-flow reactor for the catalytic combustion of methane that occurs in coal-mine ventilation air. Two variants of heat withdrawal are analysed. The simulations show that a relation exists between the method for heat withdrawal and the asymmetry in the profiles of the catalyst temperature over half-cycles of flow reversal. Too strong asymmetry impairs the efficient utilization of the heat produced. The results reveal that the recovery of heat by hot gas withdrawal from the central part of the reactor, and then, the introduction of the gas into a boiler wherein it is cooled …
Efficiency Of Heat Recovery Versus Maximum Catalyst Temperature In A Reverse-Flow Combustion Of Methane, Krzysztof Gosiewski
Efficiency Of Heat Recovery Versus Maximum Catalyst Temperature In A Reverse-Flow Combustion Of Methane, Krzysztof Gosiewski
Krzysztof Gosiewski
Results of simulations are presented concerning a reverse-flow reactor for the catalytic combustion of methane that occurs in coal-mine ventilation air. The simulations were performed for two types of catalyst: 12% MnO2/-Al2O3 and 0.5% Pd/-Al2O3. A special attention is given to maximum temperature of the catalyst bed in order to minimize occurrence of homogeneous combustion. The simulations revealed that there is a visible contradiction between efficiency of heat recovery aimed to high-pressure steam production and efforts to constraint maximum temperature in the bed.
Effective Approach To Cyclic Steady State In The Catalytic Reverse-Flow Combustion Of Methane, Krzysztof Gosiewski
Effective Approach To Cyclic Steady State In The Catalytic Reverse-Flow Combustion Of Methane, Krzysztof Gosiewski
Krzysztof Gosiewski
Computer-based simulations of a reverse-flow reactor should be carried out till the attainment of the so-called cyclic steady state. Usuallythis state is achieved bythe method of direct dynamic simulations. In the paper of Unger et al. (Comput. Chem. Eng. 21 (1997) 5167.) special approaches, making use of various minimization algorithms based most often on Newton algorithms, are proposed. In the present paper one deals with a comparison and an appraisal of these methods, applied to the reverse-flow catalytic combustion of methane that occurs in coal-mine ventilation air.