Mathematical modelling of Collie coal pyrolysis considering the effect of steam produced in situ from coal inherent moisture and pyrolytic water

A mechanistic study on kinetic compensation effect during low-temperature oxidation of coal chars

“…Adoption of the mathematical model developed previously [20] for the char particles shows that the effectiveness factor is virtually 1 and analysis using char samples further ground to smaller particle sizes shows negligible changes in the reactivity profiles; these assure negligible internal diffusion. The detailed reactivity measurement procedure can be found elsewhere [3,19].…”

Comparison of Structure and Gasification Reactivity of Rapid Pyrolysis Chars of Coal Water Slurries and Parent Coals

“…Many numerical simulation models [4][5][6][7] of entrained-flow coal gasification have been developed to describe processes and to predict the performance of gasification. Typically, those models include drying and pyrolysis models, char gasification models, and gas-phase reaction models.…”

“…The effect of devolatilization and the removal of moisture from the coal were considered in their model, and their result shows that the syngas yield is most sensitive to the reaction rates of the carbon-steam and carbon-CO 2 reactions (i.e., the rates of drying and devolatilization have little impact on syngas composition). K. Yip et al [7] developed a model that considered both pyrolysis reactions (primary and secondary) and char gasification, including volatiles cracking/reforming by steam produced from inherent moisture, and pyrolytic water from coal; the model is especially suitable for low-rank coal pyrolysis simulation.…”

Lignite temperature distribution during low temperature carbonization process in an industrial width carbonization furnace

“…8) in LTC stage. The free and internal moisture of lignite [21][22][23] absorb heat and evaporate as water vapor. The heating process involving temperature increase in the middle zone as shown in Fig.…”

“…The average errors and RMSE of the calculated temperature are listed in Table 6 23.57 and 9.99 from S 1 to S 5 . The total average RMSE of the calculated temperature was 24.50, which was used as the sigma.…”