Thermal power plants of India provides about 70-80% electricity need of our country. Impurity reduces efficiency.
Run-of mine coal contains ash content, oxygen content, moisture, minerals, sulphur and other impurities such as sand, clay etc.
There are four steps of preparation of coal before feeding it to furnace. 1) Removal of clay and dirt 2) Drying of coal 3) Sizing of coal 4) Removal of sulphur
Although this coal is clean but it contains about 10-12% unwanted minerals which produces CO 2 such as sulphates, quartz, oxides and carbonates.
33% reduction in overall CO 2 emission from plant.
This new approach involves use of chemicals to dissolve unwanted minerals in the coal and then regenerate the chemicals again for re-use.
Aim of process is to remove unwanted minerals from around 10% to below 0.05%.
Hydrofluoric Acid is used to form soluble products which can be separated by filtration. This process is known as ‘ Leaching ’.
This reaction is regenerative reaction Coal with impurity+HF HF+clean coal
The new process is very efficient & economical for “combined cycle” power technologies.
Carbon dioxide has been identified as the main gas responsible for climate change which is now accepted as a fact by the global scientific community.
1] Increase the thermal efficiency of power generation. 2] Capture CO 2 for long-term storage geological structures. Both ways are necessary for fighting climate change. REDUCING CO 2
ADVANTAGES Clean coal obtained Impurities are removed Protection of turbines Increase in boiler efficiency Reduction in CO 2 emissions
CONCLUSION Using such technique in the old as well as in the new coal fired power plant we can reduce the level of carbon dioxide in atmosphere and make the environment healthy for the present and future.