Numerical modeling of the solid waste gasification

The article presents the results of the study focused on the gasification process of solid municipal and agricultural waste of two types. It considers sunflower husks and low-value wood waste (brushwood, deadwood) which are generally similar in the content of the main elements. Numerical modeling of the process was carried out using an equilibrium gasification model based on the criterion of the minimum value of the isobaric-isothermal potential - the Gibbs energy. The Peng-Robinson model for non-ideal (real) gas components was used when calculating the parameters of the gasification process. As a result, we obtained data on the temperature range of the gasification process with complete carbon conversion. The numerical modeling demonstrated that the behavior of the selected waste was more dependent on the process temperature (the optimal detected temperature is 800-900 °С), the excess oxidizer coefficient (the best indicator is 0.2), and the gasifying agent itself, than on the type of waste. The modeling results are in accordance with world-class works and the results of an experimental study at a real facility.