CBG Biogas Upgrading Chemical Scrubber for Clarke Energy
Removes H₂S from Biogas stream using a NaOH chemical scrubber, engineered for CBG Application.
CRA engineered and supplied a chemical H₂S scrubbing system for Clarke Energy India’s high-pressure CBG application at the Blue Planet plant in Kerala. The system was designed to remove around 250 ppm of hydrogen sulphide from biogas at elevated pressure using a NaOH-based chemical scrubbing process, delivering consistent, controlled removal suited to continuous-duty operation. Supplied as a complete, integration-ready package with piping, instrumentation and controls, the system is engineered for reliable performance under pressure while limiting corrosion and maintenance.
Removing H₂S from Biogas Under Elevated Pressure for CBG Utilization
Clarke Energy India required a chemical H₂S scrubbing system for a high-pressure CBG application at the Blue Planet plant in Kerala, conditioning biogas ahead of downstream utilization. The key challenges included:
• Removing H₂S at elevated pressure rather than the low-pressure conditions typical of most biogas scrubbing trains
• Handling a continuous 971 Nm³/hr flow while holding inlet H₂S control near 250 ppm
• Limiting corrosion and equipment wear from pressurized, sulphide-laden gas
• Delivering a complete package that could integrate directly into Clarke Energy's piping, instrumentation, and controls
• Ensuring reliable, low-maintenance operation to support continuous-duty CBG utilization
The system needed to deliver consistent, controlled H₂S removal while operating safely and predictably under pressure.
Skid-Mounted NaOH Chemical Scrubber Engineered for High-Pressure CBG Service
CRA designed and supplied a chemical H₂S scrubbing system built for pressurized CBG service, focused on efficient gas-liquid contact, automation, and long-term reliability.
Core Components Delivered
• NaOH chemical scrubber column rated for high-pressure CBG operation
• Automated caustic dosing and recirculation system
• Integrated piping, instrumentation, and controls on a single skid
• Corrosion-resistant materials selected for sustained pressurized service
Engineering and Design
• Scrubber sized for 971 Nm³/hr biogas flow at elevated pressure
• Process control tuned to hold outlet quality against an inlet H₂S of approximately 250 ppm
• Design optimized for continuous-duty operation with minimal operator intervention
Fabrication and Commissioning
• In-house fabrication and factory testing of the scrubber skid
• On-site installation and commissioning at the Blue Planet CBG plant in Kerala
• Performance validation under live, high-pressure biogas operating conditions
Reliable H₂S Removal for Continuous CBG Operation
• Consistent H₂S removal from biogas at elevated pressure and 971 Nm³/hr capacity
• Stable, controlled performance suited to continuous-duty CBG operation
• Reduced corrosion and maintenance exposure from pressurized, sulphide-laden gas
• Full integration into Clarke Energy's piping, instrumentation, and controls
• System commissioned and operating at the Blue Planet plant in Kerala
Extending CRA's Chemical Scrubbing Expertise to High-Pressure CBG Applications
This project extends CRA’s chemical scrubbing expertise to high-pressure CBG applications, delivering the same reliable H₂S removal proven across CRA’s biogas installations under pressurized process conditions. By engineering the scrubber, dosing system, and controls as a single integrated package, CRA gave Clarke Energy a complete solution built for continuous-duty CBG utilization with minimal maintenance burden.
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