TRL 9. 40+ commercial licensors. Applicable across all of India's major emission sectors.
Post-combustion capture (PCC) is the process of removing CO₂ from flue gas after fuel combustion has taken place. Flue gas from a coal power station, blast furnace, cement kiln, or chemical plant is passed through an absorber column where CO₂ reacts with a chemical solvent — most commonly a monoethanolamine (MEA) or proprietary advanced amine formulation — forming a CO₂-rich liquid. This liquid is then heated in a regeneration unit to release concentrated CO₂ gas, which is dried, compressed, and transported for storage or utilisation. The lean solvent is cooled and returned to the absorber for reuse.
The primary advantage of post-combustion capture is its retrofit applicability — it can be added to existing industrial plants without requiring fundamental process modifications. This makes it the most relevant technology for India's existing stock of coal power stations, integrated steel mills, and cement plants, where replacing the core process is economically impractical. The technology is commercially proven at industrial scale at Norway's Sleipner offshore facility, Canada's Boundary Dam power station, and Quest (Shell, Canada), among more than 30 reference installations globally.
The primary challenge of post-combustion capture is energy consumption — the regeneration step requires significant heat, typically supplied by low-pressure steam extraction from the host plant. Under Australian and European energy prices, this energy penalty is manageable. Under India's specific energy cost conditions — which vary significantly between grid power, captive coal, and waste heat recovery — the economics require careful site-specific assessment. NCM's PCC evaluations always include an India-calibrated energy integration study.
NCM's sector-specific PCC assessments account for India's unique industrial conditions — coal quality, ambient temperature, water availability, and grid economics.
India's 210 GW coal fleet produces the highest-concentration, highest-volume flue gas streams for PCC. Retrofit feasibility depends on plant age, remaining operating life, flue gas composition, and proximity to storage. NCM screens the entire NTPC and state utility fleet for PCC viability.
Blast furnace gas and basic oxygen furnace off-gas have different CO₂ concentrations — blast furnace top gas typically 20–25% CO₂, BOF gas up to 45% CO₂. Higher concentration reduces capture energy penalty significantly. JSW, Tata Steel, SAIL, RINL — all have PCC-applicable emission streams.
Cement kiln exhaust is typically 14–33% CO₂ — higher than coal power flue gas — improving PCC economics. UltraTech, ACC, Shree, Ambuja, Dalmia — India's major cement producers are all viable PCC candidates. NCM has assessed kiln configurations across all major Indian cement clusters.
India's high ambient temperatures — 35–45°C across major industrial zones including Chhattisgarh, Odisha, Andhra Pradesh, and Rajasthan — significantly affect post-combustion capture performance. Absorber column efficiency decreases at higher temperatures, cooling water requirements increase, and compressor efficiency drops compared to the 15–20°C reference conditions used by most licensor performance guarantees. NCM's thermal models incorporate seasonal temperature variation across all major Indian industrial corridors.
India's coal is characterised by high ash content (25–45%) and high sulphur content in some seams — both of which affect PCC solvent performance. High particulate loading requires enhanced flue gas pre-treatment to protect absorber packing and prevent solvent contamination. High SO₂ content causes accelerated solvent degradation and increased solvent make-up costs. NCM's PCC assessments include a full flue gas characterisation step using Indian coal quality data rather than international reference conditions.
Water stress is a critical constraint in many Indian industrial regions. MEA-based PCC requires significant cooling water for the condenser and intercoolers — a resource that is severely constrained at sites in Rajasthan, Gujarat, and parts of Maharashtra. NCM preferentially evaluates dry-cooled PCC variants and water minimisation designs for water-stressed Indian industrial sites, and quantifies the incremental capital cost of water-efficient designs against the baseline.
CO₂ concentration in cement kiln exhaust — higher than coal power, improving PCC economics
CO₂ in blast furnace top gas — enabling efficient post-combustion capture at Indian steel mills
Energy penalty reduction achievable with advanced amine formulations vs. standard MEA
Technology readiness level — PCC is the most commercially mature capture technology available today
Whether you are a government body seeking policy advice, an industrial company facing CBAM exposure, or an investor seeking CCUS project opportunities — our team is ready to engage.