PAPERS SELECTED FOR THE SYMPOSIUM

• NUMERICAL SIMULATION OF GAS JET PENETRATION INTO A FLUIDIZED BED

  S. Nemoda, S. Belošević, M. Mladenović, D. Dakić, P.Stefanović, B. Grubor, D. Cvetinović, V. Spasojević - Institut za nuklearne nauke VINČA, Laboratorija za atomsku fiziku

  Abstract Text

  The paper presents a fluid-porous medium model, developed for the purpose of fluidized bed (FB) numerical simulation. In the model, a dense phase is considered to be a fixed porous medium, while gas-particle interactions and the occurrence of bubbling phase... show full text »
  Abstract Text

  The paper presents a fluid-porous medium model, developed for the purpose of fluidized bed (FB) numerical simulation. In the model, a dense phase is considered to be a fixed porous medium, while gas-particle interactions and the occurrence of bubbling phase are modeled on the basis of a balance of friction forces between gas and particles in the dense phase, taking into account interparticle collisions. This kind of approach to the FB modeling is suitable for computationally efficient engineering calculations of a fluidizing medium in a stationary condition within the FB facilities. The suggested procedure of FB modeling has been applied to a 2D numerical simulation of lateral jet injection of fluid into the FB. The simulation has included determination of jet penetration length into the FB, as well as an analysis of the effects of mixing of injected gaseous fuel with fluidizing fluid – oxidizer. To validate the calculations, the numerical results of lateral jet penetration length into the FB have been compared with the experimental results taken from available references. A general conclusion of numerical and experimental analyses is that jet penetration length into the FB is strongly affected by fluid velocity at the nozzle outlet, while the nozzle inclination angle, as well as the height of the nozzle as placed into the FB furnace, have by far less significant influence. Similarly, numerical experiments with the mixing rate of components (fuel from the nozzle and oxidizer from the main stream of fluidizing gas) show that fluid velocity at the nozzle outlet exerts a pronounced effect on the components mixing degree, while the nozzle inclination angle is by far less influential. However, during analyzing the impact of fuel intake height, it has been demonstrated that the nozzle vertical position along the FB has a significant influence on the mixing rate of chemical components in the FB, which could not be concluded only from the analysis of the jet penetration length into the FB. « hide
  Symposium Session: Environmental aspects of power generation | Ekološki i klimatski aspekti rada elektrana