Radiation modelling in oxy-fuel combustion scenarios

Validation of spectral gas radiation models under oxyfuel conditions – Part C: Validation of simplified models

“…They introduced a 4th grey gas and used the EWB model as a reference model similar to the WSGG model parameter generated by Smith et al (1982). As the parameter source of the model from Smith et al (1982) and the model from Yin et al (2010) were the same, the resulting total emissivity values of both mod- Johansson et al (2011) 0.125-2 (one set depending on ratio) 0.01-60 227-2227 SNB (EM2C) Krishnamoorthy et al (2010) 0.111; 0.5; one set for air blown combustion n.s. n.s.…”

Validation of spectral gas radiation models under oxyfuel conditions—Part B: Natural gas flame experiments

“…Spectral models from air blown combustion are not valid any more. A few researchers proposed spectral radiation models adapted to oxyfuel conditions (Erfurth et al, 2009;Johansson et al, 2010Johansson et al, ,2011Khare, 2008;Krishnamoorthy et al, 2010;Ströhle et al, 2009;Yin et al, 2010). All proposed model were developed based on other detailed models using reference calculations under oxyfuel combustion conditions rather than models developed and validated based on experimental data.…”

A Radiative Transfer Modeling Methodology in Gas-Liquid Multiphase Flow Simulations

“…The second issue of the relative importance of gas and dispersed phase radiative properties will largely be determined by the reactor configurations and the flow conditions within the reactor. For instance, through coal combustion simulations, Krishnamoorthy et al [2] showed that the fidelity of the gas-phase radiative property models had little impact on the radiation distributions in a lab-scale reactor whereas differences between gray and nongray model predictions were observed in a full-scale boiler [46]. Similarly, through steam-gasification studies on directly irradiated reactor, von Zedtwitz et al [3] determined that the radiation absorption by particles was three orders of magnitude higher than that absorbed by the gas-phase.…”

“…Modeling radiative transfer in multiphase flows is important in several applications such as solid fuel combustors [1,2], externally irradiated gasifiers [3], photocatalytic reactors [4,5], and photobioreactors (PBRs) [6,7]. While the procedure for coupling radiative transfer with the hydrodynamics has been well established in dilute multiphase flows (local dispersed phase volume fractions less than 10%) such as pulverized fuel combustors [8], the effect of radiative transfer is often neglected or grossly simplified in computational fluid dynamic (CFD) simulations where all the phases are present in significant fractions such as bubbling bed and circulating fluidized bed gasifiers [9,10].…”