EAF steelmaking example - Charging optimization

[disouzam]

1. d54b99e Added a undergrad work in which I collaborate with my colleagues from Metallurgical Engineering at UFMG (Federal University of Minas Gerais)
   All authors:

   • Camila de Brito
   • Luiz Paulo Torres
   • Pedro Ribeiro
   • Rodolfo Ferreira

   Professor Gilberto de Miranda Júnior (https://www.linkedin.com/in/gilberto-miranda-jr-18a355150/)

   Created file:

   • "eaf-steelmaking-optimization/Otimiza\303\247\303\243o-Carregamento-EAF-UFMG-2012.pdf"

2. ebe333f Initial notebook to solve EAF Charging optimization

   • An undergrad exercise I did in 2012 in UFMG, in the subject of Optimization and Simulation for Engineering
   • Constraints were not added yet

   Created file:

   • eaf-steelmaking-optimization/eaf_optimization_undergrad_exercise.ipynb

3. b987e2e Added two constraints to the optimization problem: total scrap mass in EAF and bucket volume maximum

   • And fixed name of scrap mass in the bucket (internal name passed to NumVar method)

4. c2bb500 Added another constraint to ensure heavy weight scrap doesn't exceed 30% of each bucket

5. f49d4d2 Replacing sets with lists to ensure ordering is respected in for loops - for buckets and scrap_classes

6. 54f078c Improved presentation of results through the transformation to a data frame and using built-in formatting of Jupyter notebooks

7. 7f6b0c3 Added constraint to ensure the each bucket has lower or equal volume than the remaining volume in the furnace

8. 8142e22 Added last constraints to ensure a thin layer of 30 cm is filled with light scrap on taop of each bucket

9. 352e624 Fixed type of scrap for No. 2 Bundles and DRI - It was mistakenly classified as Heavy Weight scrap

10. ca6dbb3 Minor formatting for clarity - Added white space between major blocks of contiguous content

11. 58c0df0 Fixed calculation of remaining volume for each bucket after addition of the previous ones

12. 9469b7e Static HTML as current state of optimization model

    • Results are compatible with what we achieved in original work reproduced here
    • Original work was made in Excel and AMPL/ CPLEX in 2012 when I was a Metallurgical Engineering undergrad student
    • This exercise has the goal to adopt OR-Tools in professional settings - in private repositories

    Created file:

    • eaf-steelmaking-optimization/eaf_optimization_undergrad_exercise.html

[disouzam]

Some previews of the work made in this PR:

Part of problem statement:

Initial construction of the model:

Results:

Comparison with original undergrad work performed using Excel / Solver and AMPL / CPLEX: