Mihajlovic, Milan (PhD)

Scale-up and intensification of granular processes

Project Description

This project is part of European project Intensified-by-Design (IbD®). IbD will create a holistic platform for facilitating process intensification design and optimisation in processes in which solids are an intrinsic part. It will develop and upgrade methods for the handling of solids by intensification of currently existing processes, or through completely new approaches to the processing of solids.

To support the design of intensified processes for solids handling, phenomenological model for fluidized bed membrane reactors will be developed. In order to do so, we will use more fundamental simulations such as Two Fluid Method (TFM) and Discrete Element Method (DEM).

Despite the wide application of high temperature fluidized bed reactors, there is still a lack of knowledge on behavior of gas-solids fluidized bed at higher temperatures. Scale-up process will start from DEM simulations in order to better understand phenomena that occurs at higher temperature. Gaining the desired closures we will continue with TFM simulations and eventually we will be able to develop a good phenomenological model for Fluidized bed reactor that could give a good results even at high temperature.

DEM

DEMs describe the gas-phase as a continuum, whereas each of the individual particles is treated as a discrete entity. These kind of model is known as Euler-Lagrange (E-L) model. The DEMs accounts for the gas–particle and particle–particle interactions. This model has proven to be very useful to generate closure information for TFM. We will also compare results gain by this model with experiments.

TFM

TFM treats the general case of modelling each phase or component as a continuum with its own set of governing balance equations. These kind of model is known as Euler- Euler (E-E) model. We will use closures gain from DEM simulations and we will do simulations with this model for high temperature fluidization.

Phenomenological model

In order to create a good platform for IbD project, phenomenological model needs to be valid for different conditions of fluidization. Our goal is to gain enough information from TFM and DEM so we create a model for good prediction on high temperature fluidization, for different chemical reactions etc.

Objectives

1.    Study high temperature fluidization.

2.    Study Van der Waals forces and their influence on fluidized bed.

3.    Comparison of different models and their connection.

4.    Development of a new phenomenological model which would predict at  different conditions of fluidization.