Study of 3d Flow Structure and Heat Transfer in a Vortex Furnace

Numerical study of aerodynamics and brown coal combustion in the vortex furnace with air excess variation

“…The presented work is a continuation of the previous research [3] and is devoted to numerical investigation of two operational regimes of combustion of Mongolian brown coal from Shiwei-Ovoo deposit [8] differing by air excess coefficient D in the vortex furnace of CBTI-design. Mathematical formulation of 3D turbulent two-phase reacting flow is based on Euler-Lagrange approach.…”

“…The gas phase mixture is represented by the The interphase exchange of mass, momentum and heat transfer is accounted following the Particle-Source-In-Cell method [10]. Detailed description of the used models, assumptions, boundary conditions and numerical algorithm is given in [3,6]. Computations were performed with the use of CFD package FLUENT.…”

“…In the previous research works the complex experimental and numerical studies on aerodynamics and turbulent flow features have been carried out at laboratory-scale vortex furnace model in isothermal formulation [2,3]. It has been concluded there that aerodynamic features of the swirl flow inside the vortex combustion chamber provide the following advantages during the coal-firing process: -stable structure of two-phase reacting flow; -prolonged residence time of coal particles, thus facilitating the completeness of coal burnout; -intensified heat-and mass-transfer due to enhanced mixing and high temperature level (this also allows to reduce the size of the furnace and entire boiler unit at the furnace design stage); -mitigation of NO x emissions due to the effect of recirculation of combustion products towards reaction zones inside the vortex chamber.…”

“…Numerical simulation of the flow and pulverized-coal combustion processes in the full-size vortex furnace has been performed in [4] on the basis of Euler-Euler description for the both carrier gas and disperse phases, however, only monodispersed coal particles were considered in [4]. The numerical modelling of coal-firing processes in the full-size vortex furnace has also been carried out in [3] with the use of Euler-Lagrange approach which enables to represent in details (e.g. in 100 fractions by size, or more) the polydispersity of coal particles fed into the furnace.…”

Investigation of aerodynamic structure of isothermal swirl flow in a two-stage burner

“…This approach remains to be relevant and is currently supplemented by the capabilities of modern non-intrusive optical systems (laser Doppler anemometry -LDA, Particle image velocimetry -PIV) for a detailed analysis of internal structure of the flows [6,7]. Moreover, the physical experiment provides also an empirical information for verifying the results of mathematical modeling [8,9]. (4) is fed to the outlet section (5), and it leaves it through four symmetrical pipes with the inner diameter of 20 mm.…”