The philosophy of harmonising People, Planet and Power has motivated NTPC to develop technologies for mitigating climate change due to power generation.
NETRA is engaged in the following key activities of research and technology development:
Development of pressure swing adsorption process for CO2 separation from flue gas
NETRA has developed a pressure swing adsorption (PSA) process through multi-institutional collaborative research for separation of CO2 from flue gas. PSA is a cyclic physical gas separation process where the CO2 is adsorbed on an adsorbent at higher pressure and then desorbed at lower pressure. The process is being developed as an alternative of the amine based absorption process which is cost and energy intensive.
CO2 utilisation though conversion of CO2 to Bio-fuel
NETRA has taken the initiative for development of algae based process for mitigation of CO2 by converting it in to bio-fuel and other useful products though collaborative research. Some specific algae may contain up to 40% of lipids / bio-oil by weight. Algae may have lesser land footprint as algae generates 7-30 times more than conventional bio-oil plants. Both open pond and photo algal based process will be developed.
CO2 fixation by aqueous carbonation of fly ash
Allowing the reaction of waste material such as fly ash from a power plant with flue gas containing CO2 can lead to mineralisation of calcium and oxide/silicate by converting them to carbonates. The calcium content in the fly ash at some NTPC stations is around 4 – 4.5%. This higher calcium content causes some operational problems such as scaling in pipes etc but can be advantageously used for mineralisation reaction. Studies are being conducted to use this fly ash for reaction with plant flue gas. Besides utilisation of CO2 it has other benefits such as neutralisation of alkaline ash water with acidic gases, reduction in air pollution, lesser fugitive emissions, reduction in water and possibility of reduction in land required for ash disposal.