The given diagram illustrates the process of generating electricity from coal.
Overall, energy production involves the combination of coal and oxygen undergoing various chemical processes, including heating that results in gas. Then the gases power two different types of turbines to produce electricity, with the aid of generators.
In the initial step, coal is transmitted by a ramp to a furnace, combined with oxygen. The byproduct of this stage is slag and the desired raw syngas, which then is sent for removal of its contaminants, including carbon dioxide, mercury, and sulfur. After that, purified syngas is fed into the gas turbine, which is connected to a generator, providing electricity for the power grid.
In case the gas turbine produces hot exhaust gases, they will be processed by a heat recovery generator. From here, it emits flue gasses out into the atmosphere and generates steam, which spins a steam turbine. Finally, additional electricity is created by another generator and goes directly to the power grid, marking the end of the process.