H₂S Scrubbers for Sugar and Distillery Biogas
H₂S scrubbers for press mud, spent wash and vinasse biogas, for boilers, engines and CBG at sugar mills and distilleries.
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Bulk H₂S removal for spent wash, vinasse and press mud biogas
Biogas from spent wash, vinasse and press mud carries far more hydrogen sulphide than most biogas, so it needs a bulk desulphurisation stage ahead of any other equipment. CRA supplies the chemical scrubber with biological regeneration for bulk removal, with activated carbon polishing where the gas goes to CBG or another use with a tight limit.
Outlet H₂S, bulk removal
Below 100 ppm
Outlet H₂S, with polishing
Below 5 ppm
Inlet gas
High-H₂S distillery biogas
End use
Boilers, engines and CBG
Why does distillery biogas need bulk desulphurisation?
Spent wash and vinasse biogas carries a heavy H₂S load, which corrodes boilers, engines and compressors and puts CBG out of specification. Polishing media alone cannot handle that load economically, so a bulk removal stage comes first.
How it works
The gas passes through bulk removal and then polishing, and the scrubber is designed for the plant's flow range across the season.
The chemical scrubber with biological regeneration removes most of the H₂S without adding air to the gas.
Biological regeneration of the scrubbing liquid reduces caustic use.
Activated carbon polishing brings outlet H₂S below 5 ppm for CBG.
The scrubber runs across the low flows at the start and end of the crushing season.
The treated gas goes to the boiler, engine or CBG gas train.
Key Benefits
The package is designed for the heavy H₂S load of spent wash and vinasse biogas.
The chemical scrubber with biological regeneration removes the bulk of the H₂S without adding air to the gas.
Activated carbon polishing after the wet scrubber brings outlet H₂S below 5 ppm.
The scrubber is designed to run across the flow range of the crushing season.
The package can feed a CBG gas train, a boiler or a gas engine.
The CRA Edge
CRA has more than 30 years of experience in gas handling and flare engineering.
Design, R&D and manufacturing are carried out under one roof.
ISO 9001 certified through TÜV NORD, with designs aligned with ASME, API and CE.
Designs are customised to the process needs and the regulations that apply at site.
Applications
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Frequently Asked Questions
Why does distillery biogas need a bulk scrubbing stage?
Spent wash and vinasse biogas carries a heavy H₂S load, which is more than polishing media alone can handle economically.
What outlet H₂S can the package reach?
The wet scrubber is designed for an outlet below 100 ppm, and activated carbon polishing brings it below 5 ppm.
Can the scrubber feed a CBG plant?
Yes. The chemical scrubber with biological regeneration adds no air to the gas, which makes it suitable ahead of CBG upgrading.
How does the scrubber cope with the crushing season?
CRA designs the scrubber for the plant's flow range across the season, including the low flows at the start and end.
What data does CRA need for a scrubber offer?
CRA needs the gas flow range, the inlet H₂S range, the end use of the gas and the site conditions.