Coal Gasification : In News
Coal Gasification is a thermo-chemical process that converts coal into syngas.
- Contrary to what the name of the process suggests, coal gasification does not burn coal directly.
- It heats crushed coal with limited oxygen and steam at very high temperatures (typically around 800–1,600°C) and pressure, producing syngas.
- Syngas typically contains:
- Carbon monoxide (CO)
- Hydrogen (H₂)
- Methane (CH₄)
- Carbon dioxide (CO₂)
- Water vapor (H₂O)
- Trace gases (e.g., sulfur compounds)
- Syngas can then be converted into:
- Methanol
- Ammonia
- Urea
- Synthetic Natural Gas (SNG)
- Hydrogen
- Liquid fuels and chemicals
Process of Coal Gasification:
- Coal is finely crushed to increase surface area.
- Moisture is removed from the coal.
- Coal is heated in the absence of oxygen to release volatile gases.
- A controlled amount of oxygen or air is added to partially combust the coal, generating heat.
- Steam reacts with hot carbon to form syngas through water-gas reactions.
Advantages of Coal Gasification:
- Fuel Flexibility: Can utilize low-grade coal and waste coal.
- Cleaner Combustion: Lower SOx, NOx, and particulate emissions than direct coal combustion.
- Feedstock for Chemicals: Syngas can be converted into ammonia, methanol, or synthetic fuels.
- Power Generation: Integrated Gasification Combined Cycle (IGCC) plants convert syngas to electricity more cleanly.
- Hydrogen Production:
- Provides a source of hydrogen for fuel cells and other industrial applications.
- With carbon capture and storage, coal-based hydrogen production can have substantially lower carbon emissions.
