Assessment of radiative heat transfer impact on a temperature distribution inside a real industrial swirled furnace

Abstract

Combustion systems will continue to share a portion in energy sectors along the current energy transition, and therefore the attention is still given to the further improvements of their energy efficiency. Modern research and development processes of combustion systems are improbable without the usage of predictive numerical tools such as Computational Fluid Dynamics (CFD). The radiative heat transfer in participating media is modelled in this work with Discrete Transfer Radiative Method (DTRM) and Discrete Ordinates Method (DOM) by finite volume discretisation, in order to predict heat transfer inside combustion chamber accurately. DTRM trace the rays in different directions from each face of the generated mesh. At the same time, DOM is described with the angle discretisation, where for each spatial angle the radiative transport equation needs to be solved. In combination with the steady combustion model in AVL FIRE? CFD code, both models are applied for computation of temperature distribution in a real oil-fired industrial furnace for which the experimental results are available. For calculation of the absorption coefficient in both models weighted sum of grey gasses model is used. The focus of this work is to estimate radiative heat transfer with DTRM and DOM models and to validate obtained results against experimental data and calculations without radiative heat transfer, where approximately 25 % higher temperatures are achieved. The validation results showed good agreement with the experimental data with a better prediction of the DOM model in the temperature trend near the furnace outlet. Both radiation modelling approaches show capability for the computation of radiative heat transfer in participating media on a complex validation case of the combustion process in oil-fired furnace.

A review on fundmental research of oxy-coal combustion technology

“…where κ a is the spectral absorption coefficient, κ s is the scattering coefficient, and Φ is the scattering phase function. RTE in CFD calculation is generally solved by discrete coordinate method (DOM) [42] since it is easier to combine with various radiative models and has higher calculation speed and accuracy [43]. Due to the large CO 2 proportion in oxy-fuel combustion, the gas radiation characteristics are significantly different from that in air-fuel combustion.…”

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

“…In this work, the radiation model finite volume method (FVM) is employed to approximate the RTE. FVM radiation model, in combination with CFD software AVL FIRE, is modeled by user functions, which implementation was published on an IC engine 14 and a furnace 16 . One of the advantages of FVM model is its capability to model the impact of radiative heat transport in moving meshes as in IC engines, compared to the discrete transfer radiative method, which would be computationally demanding with mesh rezone 17 .…”

“…FVM radiation model, in combination with CFD software AVL FIRE, is modeled by user functions, which implementation was published on an IC engine 14 and a furnace. 16 One of the advantages of FVM model is its capability to model the impact of radiative heat transport in moving meshes as in IC engines, compared to the discrete transfer radiative method, which would be computationally demanding with mesh rezone. 17 The FVM is a generalized method in CFD that applies to a wide range of engineering projects that feature radiative heat transport.…”