Parametric sensitivity study of a CFD‐based coal combustion model

A numerical study on parametric sensitivity of the flow characteristics on pulverized coal gasification

“…Unlike the results of Smith et al (1993), the position of #ame front is largely in#uenced by the initial turbulent intensity. This is due to the characteristics of the pulverized #ame with low gas temperature and long lifto!…”

“…In addition, he observed that radiation has most e!ect on the CO concentration with the decrease. Smith et al (1993), however, con"rmed that the e!ect of radiation on the #ow is smaller than that of devolatilization and particle dispersion. Figure 3 represents the gas temperature distributions at the axis (r/R"0.0) and the wall (r/R"1.0) with and without radiation heat transfer.…”

“…Smoot and Pratt (1979), Peters and Weber (1997), Lockwood and Salooja (1983) and Smith et al (1993) con"rmed numerically that the combustion process is sensitively a!ected by the variables associated with devolatilization, char oxidation and particle dispersion rather than the initial turbulent intensity. However, since the standard k} model is sometimes sensitive in the initial turbulent intensity (Smoot, 1984) accurate turbulent intensity may be employed to obtain more precise magnitude and position of recirculation zone.…”

“…Smith et al (1993) con"rmed that using PCGC-2 code, the devolatilization process and kinetic rate constant of char have a major impact on the variation of combustion e$ciency and ignition point. In addition, radiation heat transfer and initial turbulent intensity were predicted as a secondary e!ect on the combustion process.…”

Effect of coal type on gasification in pressurized drop tube furnace

“…However, in this study, the Q factor is assigned as a value for all the coal types in order to ascertain the availability of computations. Lockwood and Salooja (1983), Lackwood and Mahmud (1988) and Smith et al (1993) examined the importance of volatile release in computation. They insisted that the temperature of reaction zone and coal conversion be predicted to be lower than the experimental data, provided Q"1.0.…”