Thermal radiation in oxy-fuel flames

Investigation of particle radiation and its effect on NO prediction in a pilot-scale facility for both air and oxy-coal combustion

“…The particle effects are accounted for in Eqs. (2) and (7) with equivalent absorption coefficient κ p , scattering coefficient σ p and the equivalent emission E p,i being defined as follows:…”

“…With increasing regulations focused on environmental protection, coal combustion modelling has received special attention for its potential role in reducing the environmental impact of utilising coal combustion, such as retrofits of traditional power plants and new designs of coal fired power plants for oxyfuel combustion, one of the main technologies for CO 2 capture. Radiation heat transfer is important in pulverised coal combustion because of the high temperatures reached within combustion furnaces, as well as the presence of participating species such as CO 2 /H 2 O, and solidphase coal, char and fly-ash particles [2,3]. The characteristics of radiative heat transfer under oxyfuel combustion are different from those of air-fired combustion, due to the higher concentration of participating species and potentially higher temperatures at elevated oxygen concentrations.…”

Coal-Derived Soot Behaviors in O2/N2 and O2/CO2 Atmospheres, Studied through a 1-D Transient Coal Combustion Model

“…Even though soot emission is negligible at the exit of a well-designed furnace, that does not mean that coal-derived soot evolution is not important. Indeed, soot plays an essential role in radiative heat transfer in a pulverized coal boiler, especially in the near-burner zone. − On the other hand, in recent years many studies have been carried out on the heat-transfer and reaction pathways in oxy coal combustion (OCC), since its combination with carbon capture and sequestration (CCS) is an effective way to control greenhouse gases . Considering the important role of soot in radiative heat transfer, it is necessary to study coal-derived soot behaviors in an O 2 /CO 2 atmosphere.…”

Experimental Study on Quantitative Radiation Properties of Laminar Oxygen-enriched Inverse Diffusion Flames in Gas Turbines

“…Accordingly, oxygen-enriched combustion provides benefits for many industrial combustion applications, leading to increased productivity and better product quality 2) for items such as coal gasifiers, gas-turbine engines and industrial stoves. [3][4][5][6][7][8] Varying the degree of oxygen enrichment changes the diffusion flame properties in terms of species concentration, structure, temperature, and others, which directly or indirectly affects the radiative characteristics of the flame. The variation in thermal radiation, which includes the continuum and spectral thermal radiation from soot and polyatomic gas, respectively, also contributes to the determination of flame structure, flame temperature and other important parameters.…”