Article

Plasma Chemistry and Plasma Processing

, Volume 13, Issue 1, pp 141-167

Pulverized coal plasma gasification

  • R. A. KalinenkoAffiliated withInstitute of Petrochemical Synthesis, Russian Academy of Sciences
  • , A. P. KuznetsovAffiliated withInstitute of Petrochemical Synthesis, Russian Academy of Sciences
  • , A. A. LevitskyAffiliated withInstitute of Petrochemical Synthesis, Russian Academy of Sciences
  • , V. E. MesserleAffiliated withKazakh Research Institute of Power Engineering
  • , Yu. A. MirokhinAffiliated withInstitute of Petrochemical Synthesis, Russian Academy of Sciences
  • , L. S. PolakAffiliated withInstitute of Petrochemical Synthesis, Russian Academy of Sciences
  • , Z. B. SakipovAffiliated withKazakh Research Institute of Power Engineering
  • , A. B. UstimenkoAffiliated withKazakh Research Institute of Power Engineering

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Abstract

A number of experiments on the plasma-vapor gasification of brown coals of three types have been carried out using an experimental plant with an electric-arc reactor of the combined type. On the basis of the material and heat balances, process parameters have been obtained: the degree of carbon gasification (ζc), the level of sulfur conversion into the gas phase (ζs), the synthesis gas concentration (CO+Hz) in the gaseous products, and the specific power consumption for the gasification process. The degree of gasification was 90.5-95.0%, the concentration of the synthesis gas amounted to 84.7–85.7%, and the level of sulfur conversion into the gas phase was 94.3–96.7%. Numerical study of the process of plasma gasification of coals was carried out using a mathematical model of motion, heating, and gasification of polydisperse coal particles in an electric-arc reactor of the combined type with an internal heat source (arc). The initial conditions for a conjugate system of nonlinear differential equations of the gas dynamics and kinetics of a pulverized coal stream interacting with the electric arc and oxidizer (water vapor) agree with the initial conditions of the experiments. The computation results satisfactorily correlate with the experimental data. The mathematical model can be used for the determination of reagent residence time and geometrical dimensions of the plasma reactor for the gasification of coals.

Key words

Plasma gasification lower-grade coals electric-arc reactor mathematical model of plasma gasification of coals