The diagram below shows the process of electricity production. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The process details the steps in the production of

electricity

. Looking from an

overall

perspective, it is readily apparent that energy production involves the combination of coal and oxygen undergoing various chemical processes including heating that results in gases that

then

power two different types of turbines to produce

electricity

. In the earliest stages, coal is transported by a ramp to a furnace where it is heated and combined with oxygen. The waste byproduct of

this

is slag and the desired

gas

(raw syngas) is

then

sent for removal of its harmful contaminants, CO2, mercury, and sulphur

,

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before the purified

gas

is used to run a

gas

turbine connected to a generator.

This

is the first way that

electricity

is created.

However

, the

gas

turbine using the purified syngas

also

produces excess hot gases and these are utilised in a heat recovery steam generator (which releases flue gases into the atmosphere). The generator produces steam which turns the turbines of a steam turbine to generate additional

electricity

.