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• THEORITICAL AND EXPERIMENTAL STUDY OF TOXICITY OF FLUE GASES OF A BURNER WITH COMBINED FLAME FORMATION

  D. А. Bogdanets , V. I. Grishchenko , К.F. Kalmykova , А.I. Rakhmanov , D.S. Tsymbalov

  189-200

  2025-10-01

  Abstract ▼

  A convenient and reliable algorithm based on mathematical programming methods is proposed for calculating the chemical composition of flue gases from a hydrocarbon-fueled burner with combined flame formation. The stability of the computational process is ensured by using the equilibrium constant method in order to reduce the dimensionality of the system of governing equations with an appropriate choice of the nomenclature of reagents and base substances. The model considers twenty-two reagents, a significant proportion of which are toxic, and CO, H₂, O₂ and N₂ are selected as base substances.
  The equilibrium constants are calculated based on an original approximation of the temperature dependence of the heat capacity of all components. The proposed approximation, unlike standard polynomial ones, not only provides physically justified limits in the region of low and high temperatures, but also contains twice as few fitting parameters. A technique for calculating these parameters using known tabular values has been developed. Preliminary testing of the model was performed for individual chemical blocks (nomenclature subsets) by comparing the calculation results with the data obtained using the JANAF chemical calculator. Calculations of toxicity of flue gases of the experimental burner device with formation of a torch by means of an electric arc and supply of superheated steam are performed in the range of operating parameters extended in comparison with the expected operational one. The result is generalized by methods of mathematical programming taking into account the weighted toxicity of flue gases. An estimate of the error of the formula representation of toxicity is performed. An interpolation algorithm is proposed that allows specifying the weighted toxicity of flue gases in the entire range of scenario modeling. The results of computer modeling were compared with the data of technical tests of the experimental burner: their agreement was established within the multiplier of 2, which corresponds to the methodological and instrumental measurement error. The results obtained in the computational experiment allow optimizing the design and operating parameters of innovative burner devices with a combined mechanism of torch formation. Calculations have shown and experimentally confirmed that the supply of superheated steam to the combustion zone homogenizes the flame, equalizes the rate of oxidation of hydrogen and carbon in the oil fuel, thereby reducing emissions of incomplete combustion products and nitrogen oxides. The development is proposed for use in the design, technical testing and fine-tuning of promising burner devices on oil, alcohol and biofuel.