Abstract
The analysis of the process of thermal transformations of carbon environment at high temperature (T = 2000 K) processing in a chamber of a plasma-jet reactor with the use of a water vaporizer as an oxidizer is done. The influence of heat exchange parameters on the heating of coal particles of different sizes is established. The method of mathematical modeling of the process of conversion of dispersed carbon raw materials in a stream of water plasma at a temperature in the reaction chamber Tg = 2000 - 5000 K was developed. The technique allows to determine the influence of thermal and kinetic parameters on the process of heat exchange between coal particle and a steam-plasma environment. A conversion time of a coal particle into a gaseous state is determined. It is the time that laid the foundation for calculating the main geometric and regime parameters of the reactor. The expediency of increasing the temperature of the gases in the reactor Tg = 3000 K is proved. This determines the minimum time for conversion of carbon under the combined influence of convective and radiation heat exchanges.
Highlights
The processes of the heat- and mass-transfer, aggregate and phase transformations in minerals and rocks during thermal action, oxidation-reduction processes with the release or absorption of the heat are associated with various technological recycling processes of the carbon-containing environment
It was previously established that the complete conversion of a coal particle from a solid to a gaseous state is carried out when heated to a temperature Tp = 1800 K, apart from its dispersion
It was established that the process of conversion of coal particles in the size dp = 50 microns at a change in the temperature of gas in the reaction chamber from 2000 К to 5000 K proceeds rapidly up to 9 times
Summary
The processes of the heat- and mass-transfer, aggregate and phase transformations in minerals and rocks during thermal action, oxidation-reduction processes with the release or absorption of the heat are associated with various technological recycling processes of the carbon-containing environment. As a result of the research, it was concluded that a monodisperse raw material should be used to ensure uniform temperature treatment of the whole powder mass. This creates some difficulties in real conditions of the process. In the technologies of thermal transformation, the original material is usually used in the size of 100 - 200 microns For these conditions it is necessary to create a modern efficient technology of chemical transformations based on local high-temperature controlled zones with a energy density of 102 - 104 W/cm and a temperature in the reaction chamber T > 2000 K. It should be noted that the technology of heterogeneous plasmochemical processes is not developed enough and requires further synthesis and analysis of the results obtained in the process of research and technological development
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