CO₂ Removal System

Pretreated biogas enters the CO₂ removal system where CH₄ content is upgraded from 50–70% to 96–99%+ to meet CBG vehicle fuel standard (GB 20711) or natural gas pipeline injection standard (GB 17820). We offer both wet aMDEA and dry PSA technology routes with matching drying solutions.

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Product & Technical Features

Wet aMDEA
- Chemical absorption of CO₂ at 0.8–1.0 MPaG; CH₄ recovery > 98%; outlet requires molecular sieve deep drying (dew point < −40°C)
PSA (Pressure Swing Adsorption)
- Multi-tower cyclic switching with inherent partial dehydration (outlet dew point −20°C to −40°C); CH₄ recovery 80–90%; suitable for mid-to-large scale
Membrane Separation
- Compact skid-mounted design, ideal for small and mobile projects; feed gas requires deep drying to protect membrane modules
Auxiliary Drying
- Dual-tower 4A molecular sieve TSA dryer after wet CO₂ removal ensures feed gas quality for downstream CNG/LNG units

Core Advantages

Technology Route	CH₄ Purity	CH₄ Recovery Rate	Applicable Scale
aMDEA Wet Process	96–99%	> 98%	Large (> 500 m³/h)
PSA Dry Process	96–99%	80–90%	Mid-to-large (100–5,000 m³/h)
Membrane Separation	96–99%	85–95%	Small/Skid-mounted

Key Applications

We provide turnkey CO₂ removal systems for biogas upgrading projects, including absorbers, regeneration systems, molecular sieve dryers, and instrumentation, supporting both CBG vehicle fuel and pipeline injection product directions.