Kinetic combustion parameters for chars using to IFRF solid fuel data base

In this study, kinetic combustion parameters are determined for chars in the IFRF solid fuel data base (SFDB) in order to model the combustion history of the chars. Experimental burn-out data are used to determine the kinetic parameters that best fit the experimental data according to two standard char combustion models. The SFDB contains burn-out data, for more than 130 different chars of which more than 100 are coal chars, obtained from drop tube experiments. In previous IFRF-reports, kinetic parameters have been determined for several of the chars. The parameters are, however, model specific and only valid for the model that has been used when determining the parameters. In this study, two standard particle models available in Fluent have been used: the kinetic/diffusion surface reaction rate model and the intrinsic char combustion model. The intrinsic model is more detailed and requires a larger amount of fuel specific information. In order to simplify the use of the intrinsic model, some properties of the fuel can be assumed, which will affect the accuracy of the modeling results. The main purpose of the study is to compare which of the models that is most suitable for modeling the combustion history of char particles, while choosing some fuel properties to be constant for different coals in the intrinsic model.