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 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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