This document discusses mathematical models of power plants and CO2 capture. Specifically, it summarizes a presentation on modeling a ring-ball coal mill that is part of the coal grinding process in a thermal power plant. The presentation describes developing a model of the coal mill in MATLAB/Simulink to simulate signals like pulverized coal temperature and coal mill engine power. The model incorporates heat transfer dynamics and is tuned using real plant data to accurately reproduce plant behaviors and disturbances for applications like process monitoring and control system testing.