1d1d Scrap Preheating Model

This model was developed to modell the preheating of scrap in an semi-continuous EAF scrap charging shaft.

Setup and Usage

Only tested with julia 1.5.3 and 1.6.1

All files should be run from within the project folder!

./src contains the essential code of the model

0. Download and install julia

1. Download from: www.julialang.org
2. Add the folder containing the julia.exe to system variable: Path

1. Setup Environment & Run Scripts

1. Open a Terminal
2. Goto the folder of this project containing the Project.toml file.
3. Open Julia
4. Switch to package mode with ]
5. In pkg mode activate current environment with activate .
6. Use instantiate to install packages defined in the Project.toml file (first time only)
7. Switch back to julia REPL mode (backspace)
8. run desired script from within julia for example with include("./ex/eval_ex.1")

Future Development Ideas (TODO List ...)

This is a pretty long list btw ...

Discalimer: This project is currently not in active development, as there is no funding to work on this topic at the moment. So you can read the list more as a what could be done, instead of what will be done. If you are interessted if future developments of this model feel free to contact us over at www.iob.rwth-aachen.de

Performance Optimization

Spliting 1d-1d Modelling

We could split the time stepping between the heat conduction problem in the scrap pieces, and the heat transport in the overall shaft.

Therefore we could use dt_shaft and dt_scrap (probably dt_shaft will be much higher) and only adapt boundaries for heat conduction in the scrap after each dt_shaft.

Futhermore this could have the benefits that we could decouple the methods used to solve the problems.

This may lead to some inaccuracies if dt_scrap grows to large, so we have to be careful here.

Usability

Extend Login to make cases more reproducible - maybe input file format?

Settings/Property Files

Offload the settings which are right not done in the prepare_data.jl to i.e. specific json files.

Features

Possible features that could be implemented.

More specific front side radiation modell

In a previous version of this model (written in Matlab) we had an surface2-surface (s2s) model, but it was very specific for a certain problem. Generalisation of such a model is hard - maybe we could interface to FARADS3D at some point ...

Scrap Piece Conduction Modell

Right now we ignoring the heat conduction between the individual scrap pieces. Maybe we can come up with a simple model based on contact areas and contact heat resistances. But this should not be to relevant in the most use cases ...

Convection Models (HTC)

Incorporate some models to relate changes of the off-gas flow rate to changes of the heat transfer coefficients (htc) as it depends on the Reynolds-Number (Re). Therefore we should considering evaluating changes of the off-gas properties (Pr, lam, nu) to the htc, as they influence Re and Nu (Nusselt-Number).

Enhance Scrap Piece Radiation Modelling

The modeling right now is very simple and uses many assumptions, can we use other models like FARADS2D to enhance the radiation modelling a bit without getting to complex?

More Integration Functions

Add more specific integration function for all MaterialPropertyOfXs in matprop_functions.jl

Scrap Carbon Modell

Implement some type of carbon exchange model for bulk and off-gas to also use the model for post combustion optimization calculations.

Auto Optimization

Allowing data based auto optimization (maybe NN or simple optimization methods) of modelling coefficients.

Make Model 2-3 dimensional

Extend 1d1d model to 2d1d or 3d1d model, so that spacially different scrap compositions and properties can be used.

General Cleanup

• make solve1d1d(m::M1d1d) more modular
• can we get rid of manual Float64 type annotations in solver1d1d?
• enhance precompile time

Documentation

More and more better!