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Hub / Commercial Clean Tech & MEP / CCUS & Flue Gas Mineralization

Commercial CCUS & Flue Gas Mineralization Sizer

Model commercial and district energy post-combustion carbon capture. Size liquid amine absorption, potassium carbonate, and concrete batch mineralization systems. Calculate metric tonnes CO2 captured, parasitic reboiler thermal penalties, and 45Q federal tax credit cash flows ($85/tonne geological storage / $60/tonne utilization).

Section 45Q / ISO 27914

1. Flue Gas Stream & Flow Rate

Flue Gas Volumetric Flow (SCFM): 25,000 SCFM

2,000 SCFM50,000 SCFM100,000 SCFM

CO2 Concentration (% vol): Gas boiler 8–10%, turbine 3–5%

Operating Hours / Year: Continuous 8,000–8,760 hrs

2. Capture Technology & Reboiler Heat

Capture Process Technology:

Target CO2 Capture Efficiency (%): 90.0%

Annual CO2 Captured: 23,124 Metric Tonnes

Equivalent Daily Capture: 63.4 Tonnes / Day

3. Section 45Q Credits & Offtake Monetization

CO2 Disposition / Sequestration Destination:

Installed CapEx ($/tonne/yr): Includes capture, compression & BoS

Operating Parasitic O&M ($/tonne): Steam, power, solvent replacement

CCUS Mass Balance & Absorption Process Schematic

Flue gas direct absorption, rich/lean solvent loop, stripper reboiler & sequestration

Flue Gas Lean Amine Pure CO2

Flue Gas CO2 In 25,693 Tonnes/yr

Net Clean Exhaust 2,569 Tonnes/yr (10%)

Reboiler Parasitic Heat 17,343 MWh / yr

Annual Revenue & Section 45Q Value Stacking $1,306,406 / yr Net

1. Section 45Q Federal Tax Credit ($85.00/tonne): $1,965,540 / yr

2. Concrete Mineralization Binder Savings / Green Prem: $0 / yr

3. Operating Parasitic Heat & Solvent O&M Cost: -$659,034 / yr

Pro-Forma Payback & Levelized Cost of Carbon (LCO2)

Total CapEx $7,399,680 Turnkey Installed

Capture LCO2 $54.20 / t Full Life Cycle Cost

Simple Payback 5.7 Yrs 17.6% Unlevered IRR

12-Yr 45Q Total $23,586,480 Direct Pay Horizon

15-Year Cumulative Net Cash Yield: $12,196,410

Transferable credits under IRA §6418

Engineering Sizing Basis & Compliance Standards

Post-Combustion Chemical Absorption Flue gas entering the packed column contacts lean aqueous amine solvent (e.g. 30 wt% MEA or promoted piperazine). CO2 reacts reversibly to form carbamates. The rich solvent is pumped to a stripper reboiler at 120°C (248°F) where thermal energy desorbs high-purity (99.5%+) CO2 gas for compression.

Direct Concrete Mineralization In ready-mix concrete batching, captured CO2 is injected into the mixer during batching. The CO2 reacts instantaneously with calcium ions in wet cement to form nano-calcium carbonate (CaCO3). This permanently traps the carbon (non-leachable) while increasing compressive strength by 10%–15%, enabling cement content reductions.

Internal Revenue Code Section 45Q The Inflation Reduction Act (IRA) boosted 45Q credit rates to $85/metric tonne for permanent geological storage (Class VI deep saline aquifers) and $60/metric tonne for utilization/mineralization. The minimum annual threshold for commercial industrial facilities was reduced to 12,500 tonnes/yr with direct pay elective.