Simplified numerical model application for the furnace aerodynamics primary evaluation on the example on a boiler invert furnace on the advanced ultra-supercritical parameters


Аuthors

Prokhorov V. B., Fomenko N. E.*, Fomenko M. V.

National Research University “Moscow Power Engineering Institute”, 14, Krasnokazarmennaya str., Moscow, 111250 Russia

*e-mail: fomenko.n.e@yandex.ru

Abstract

Invert furnaces application is prospective for the power units on advanced ultrasupercritical steam parameters. Their implementation allows reducing capital expenditures by decreasing the number of costly metals for high-temperature heating surfaces and main steam pipelines. The efforts on developing solid fuel combustion schemes in the invert furnaces are underway at the MPEI National Research University. The presented article presents the description of the two combustion schemes, which aerodynamics were being simulated by the original simplified numerical model developed by the authors. The schemes are accomplished by the opposing-offset scheme, and differ by the level and angles of the burners and air nozzles positioning. The simplified numerical model feature consists in air movement simulation inside the furnace without combustion processes. The burner jets trajectory is close to the ones trajectory obtained by the simulation with combustion. This is being achieved by setting the air temperature at the burner inlet of 2000ºC and employing the inverse density dependence on temperature. Alike, each air type (from each type of burners and air nozzles) is being marked in the program by a separate name. The article describes the numerical simulation stages, such as 3D models creation, computational meshes generation, selection of computational models, equations and solvers, setting boundary conditions, and results processing. A mesh studying process conducting, employing Richardson extrapolation is described. The obtained simulation results are represented by the streamlines, numerical values of labeled flows concentrations in various planes and fields of these concentrations. The streamlines obtained by the simplified numerical modeling were compared with the photographs of jet trajectories identified as the result of experimental modeling on a physical setup. Good convergence of the results was noted. A general analysis of all results allowed confirming the combustion scheme No. 2 advantages over scheme No. 1 due to: the absence of dynamic jet pressure on the furnace walls; the better swirling of burner jets, greater participation of tertiary air jets in the afterburning process of fuel; the presence of factors contributing to the torch dispersion along the torch height; vortex formation in horizontal and vertical planes. The scheme No. 2 is being recommended for application in the invert furnaces of boilers on advanced ultra-supercritical steam parameters.

Keywords:

invert furnace, straight-flow burner, step-by-step combustion, numerical simulation

References

  1. Kirpichev M.V., Mikheev M.A. Modeling of thermal devices [Modelirovanie teplovykh ustroistv]. Moscow, Izdatel’stvo Akademii nauk SSSR, 1936, 320 p.
  2. Kirpichev M.V. Teoriya podobiya: monografiya Similarity theory. Monograph. Moscow, Izdatel’stvo Akademii nauk SSSR, 1953, 99 p.
  3. Paramonov A.P., Kadyrov M.R., Trinchenko A.A. Research on Influence of the Furnace Chamber Aerodynamics on Ecological Indicators of Boiler Plants (Part 1: Model of a Low-temperature Swirl Furnace). Procedia Engineering, 2017, vol. 206, pp. 546–551. DOI: 10.1016/J.PROENG.2017.10.514
  4. Paramonov A.P., Kadyrov M.R., Trinchenko A.A. Research on Influence of the Furnace Chamber Aerodynamics on Ecological Indicators of Boiler Plants (Part 2: Results of a Low-temperature Swirl Combustion Practical Implementation and their Analysis). Procedia Engineering, 2017, vol. 206, pp. 558–563. DOI: 10.1016/J.PROENG.2017.10.516
  5. Alekseenko S.V. et al. Investigation of transfer processes in swirling flows in application to vortex furnaces for coal fuel. International Journal of Thermal Sciences, 2021, vol. 161, 106715. DOI: 10.1016/j.ijthermalsci.2020.106715
  6. Prokhorov V.B. et al. Physical modeling of the M-shaped boiler furnace aerodynamics. Journal of Physics: Conference Series. — IOP Publishing, 2020, vol. 1683, no. 4, 042072. DOI: 10.1088/1742-6596/1683/4/042072
  7. Prokhorov V.B. et al. Numerical variational study of the M-shaped boiler invert furnace. Journal of Physics: Conference Series. — IOP Publishing, 2020, vol. 1683, no. 4, 042033. DOI: 10.1088/1742-6596/1683/4/042033
  8. Fomenko N.E. et al. Numerical study of the methane-air combustion in the direct-flow burner of the boiler 300 MW TGMP-314 boiler. Journal of Physics: Conference Series. — IOP Publishing, 2019, vol. 1370, no. 1, 012006. DOI: 10.1088/1742-6596/1370/1/012006
  9. Migay V.K. Modeling of heat exchange power equipment. Leningrad, Energoatomizdat, 1987, 265 p.
  10. Prokhorov V.B., Fomenko N.E., Fomenko M.V. Development of a simplified methodology for furnace aerodynamics with vortex combustion of organic fuel modeling. Journal of Physics: Conference Series. — IOP Publishing, 2021, vol. 2088, no. 1. 012016. DOI: 10.1088/1742-6596/2088/1/012016
  11. Di Gianfrancesco A. The fossil fuel power plants technology. Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, 2017, pp. 1–49. DOI:10.1016/b978-0-08-100552-1.00001-4
  12. Volkov E.P., Chernov S.L., Fomenko N.E. Development M-shaped profile for A-USC steam boiler. Journal of Physics: Conference Series. — IOP Publishing, 2019, vol. 1370, no. 1. 012007. DOI: 10.1088/1742-6596/1370/1/012007
  13. Прохоров В. и др. The Coal Dust Combustion Scheme for an Invert Furnace of an A-USC M-Shaped Boiler. Problemele Energeticii Regionale, 2022, vol. 55, no. 3, pp. 38–53. DOI: 10.52254/1857-0070.2022.3-55.04
  14. Richardson L.F. The approximate arithmetical solution by finite differences with an application to stresses in masonry dams. Philosophical Transactions of the Royal Society of America, 1911, vol. 210, pp. 307–357.
  15. Richardson L.F., Gaunt J.A. VIII. The deferred approach to the limit. Philosophical Transactions of the Royal Society of London. Series A, containing papers of a mathematical or physical character. 1927, vol. 226, no. 636–646, pp. 299–361.
  16. Celik I.B. et al. Procedure for estimation and reporting of uncertainty due to discretization in CFD applications. Journal of fluids Engineering-Transactions of the ASME, 2008, vol. 130, no. 7. DOI: 10.1115/1.2960953
  17. Prokhorov V.B. et al. Investigation of the direct-flow jets vortex motion in the M-shaped boiler invert furnace. Journal of Physics: Conference Series. — IOP Publishing, 2021, vol. 2088, no. 1, 012036. DOI: 10.1088/1742-6596/2088/1/012036

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