Decarbonization · Polytropic head · Multi-stage with intercooling
CO₂ Compression Power & Stages
Multi-stage CO₂ compression with intercooling, screening-level estimate per GPSA / ASME PTC-10 polytropic head method. Sizes the train from low-pressure capture (1.5–2 bara) to dense-phase pipeline conditions (150–200 bara), with stage-by-stage power and cooling duty.
Service Conditions
kg/h
bara
bara
°C
Intercooling & Efficiency
°C
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📚 Learn the Theory
Multi-stage CO₂ compression: Schultz polytropic head, intercooling, the gas-to-liquid pumping transition near the critical point, and DOE NETL benchmarks.
Stages picked so PR/stage ≤ user limit (default 3.0 — typical for centrifugal CO₂ service).
k = Cp(T)/(Cp(T) − R) from the NIST Shomate ideal-gas Cp polynomial — so k varies stage-to-stage (≈1.27–1.29); real-gas Z(T,P) is computed per stage from the Peng-Robinson (1976) EOS. For final design use REFPROP/GERG-2008 with full real-gas Cp departure at each stage.
Intercoolers between stages bring CO₂ back to user-specified outlet T (default 40 °C).
Final stages above Pc with cool feed are flagged as pump regime — those are typically centrifugal CO₂ pumps in real designs.
Standards: GPSA §13, ASME PTC-10, ISO 27913:2016, API STD 617, DOE NETL Cost & Performance Baseline.
Typical specific energy: 80–130 kWh/t for 1.5 → 150 bara CCUS service (DOE NETL).