World energy consumption is growing. Reliable forecasts say total energy consumption will increase by around 35–40% in the next 20 years, and coal will still be the major source of power generation globally.
According the International Energy Agency, in 30 years’ time the volume of the international coal trade will increase by almost 1.5 times compared to current levels and trade flows will continue to move towards Asia. Continuous improvement in geological exploration and mining methods mean new coal resources continue to be found.
Coal — helping to ensure global energy security
Modern technologies help to reduce the negative impact of coal mining and coal-fired generations on the environment:
Methane capture and utilisation
During underground mining, highly concentrated methane (CH4) can be captured and removed through the use of extraction systems. Where practical, this gas is used to generate electricity or heat mining facilities.
High-rank coals are high in carbon and low in ash and moisture. This means that, when burned, less fuel is required to vaporise moisture and less heat is lost to the ash. Furthermore, washing coal prior to combustion helps not only to reduce the coal’s ash content by more than 50%, but also the sulphur content. Therefore, the higher the quality of coal, the fewer emissions there are for the same amount of electricity produced.
State-of-the-art coal-fired stations
Increasing the efficiency of coal plants also leads to fewer CO2 emissions without affecting the power output. A one percentage point improvement in the efficiency of a conventional pulverised coal combustion plant results in a 2-3% reduction in CO2 emissions.
Currently, most coal-fired power plants operate under sub-critical steam conditions and have an average efficiency of 35%. New technologies enable coal-fired plants to work at supercritical and ultra-supercritical temperatures, with an efficiency increase of 40% or 50% and above
at ultra-supercritical plants. Increasing the efficiency of all coal-fired power plants from 33% to 40% would cut CO2 emissions by an amount equal to expanding the world’s current solar power capacity by 195 times.