The provided diagram illustrates the way in which electricity is produced.
Overall, the process involves two main stages, commencing with syngas generation and purification and terminating with electricity being created and delivered to power grids.
Initially, coal is conveyed into a furnace, into which oxygen is added simultaneously. The furnace processes the two ingredients to make raw syngas, while its by-product, called slag, is discharged. After that, this raw syngas undergoes a purification phase to remove impurities such as carbon dioxide, sulphur, and mercury, thereby forming clean syngas that is ready for the next stage.
At the second stage, purified syngas is fueled into a gas turbine. In the first case, the gas turbine harnesses the syngas to operate a generator, which converts the gas into electricity to provide for the grids. In the other case, purified syngas, after going through the gas turbine, can also be transformed into hot exhaust gases. Next, the resulting gases are charged into a heat recovery steam generator to turn it into steam and a by-product, named flue gases. Subsequently, this steam is collected and used to power a steam turbine, which in turn powers a generator connected to it. As a result, electricity is generated and eventually delivered to power outlets.