Abstract
The results of theoretical and experimental investigations on methane pyrolysis with infiltration through a heated porous matrix generated from various carbon materials are presented. The features of mathematical<br />models, kinetic relationships of process are discussed. The mathematical model of process shares on external problem (a flow of particles in an external stream) and internal problem (reaction in particle porous). The<br />heat and mass transfer for the average (over the reactor cross section) parameters, ignoring the heat transfer in gas by thermal conductivity, is described by unsteady-state one-dimensional differential equations in<br />partial derivatives. For the mathematical description of process kinetics of methane decomposition the approach is used by which the soot formation is treated as a chain radical process. The porous media is represented by a system of large enough particles. In its turn, every macroparticle consists of finer particles, which are also composed of microparticles, etc. Calculating programs were used for modeling and efficiency analysis of technological installations for technical carbon production in a regenerative heater, filled by a ceramic nozzle and for similar purposes concerning carbon (oven soot) in autothermal torch process of partial gas oxidation by air at a surplus factor of oxidizer in relation to stoichiometry 0.4-0.5 at pressure close to atmospheric on Sosnogorsk Gas-Processing Plant. Experiment descriptions and techniques for experimental realization are given. These results are used as fundamentals for new technologies considering pyrocarbon materials production in the continuous operation reactor.
Highlights
The reaction of thermal destruction of methane into carbon and hydrogen is the basis of physicochemical processes of carbon production from natural gas
Two modifications of carbon are produced in the reaction of methane pyrolysis: dispersible carbon − in volume reactions, and pyrocarbon - deposition of solid carbon − in surface reactions
The created laboratory installation allows carrying out improvement of technologies of for preparation of carbon materials by pyrolysis of methane in various porous environments
Summary
The reaction of thermal destruction of methane into carbon and hydrogen is the basis of physicochemical processes of carbon production from natural gas. The technologies for granulated pyrocarbon production in a flowing type reactor [1,2] and carbon materials production by simultaneous thermal processing of natural gas and wood waste are experimentally and theoretically [3] substantiated in a series of joint works proceeded at the Institute for High Temperatures RAS with Sosnogorsk Gas-Processing
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