Gas Conditioning for Distillery Boilers
Gas conditioning that scrubs, dries and boosts spent wash biogas for distillery boilers.
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Boiler-ready fuel gas from spent wash biogas
CRA scrubs, dries and boosts distillery biogas so it can fire steam boilers with less corrosion and lower sulphur dioxide emissions.
Stages
Scrubbing, drying and boosting
End use
Steam boilers and heaters
Outlet H₂S after bulk removal
Below 100 ppm
Caustic saving
Up to 90% with regeneration
How is distillery biogas conditioned for boiler firing?
Biogas from the spent wash digesters first passes through an H₂S scrubber that removes most of the sulphur. A dehumidifier then cools the gas so that the water condenses and drains away, and a booster raises the gas to the pressure the boiler burner needs. The conditioned gas reaches the burner clean, dry and at a steady pressure.
How it works
The conditioning train sits between the digester gas holder and the boiler house, with a branch to the flare for surplus gas.
The H₂S scrubber removes most of the hydrogen sulphide.
The dehumidifier cools the gas to condense its water.
The condensed water is separated and drained.
The booster holds the burner supply pressure.
Clean, dry gas fires the boiler, with surplus gas sent to the flare.
Key Benefits
Removing H₂S protects burners, boiler tubes and flue ducts.
Less sulphur in the fuel means less sulphur dioxide from the stack.
The dehumidifier removes water before it reaches the burner.
The booster holds the gas at the pressure the burner needs.
CRA selects and sizes the scrubber from the measured H₂S.
Projects That Push Boundaries
Complete gas conditioning train transforming raw digester gas into clean, usable fuel for a city utility.
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
Built to help you specify.
Sizing tools, decision guides, and technical references. Use them before, during, and after your evaluation.
Frequently Asked Questions
Why does spent wash biogas need conditioning for a boiler?
Spent wash biogas carries a heavy H₂S load and is saturated with water. The H₂S corrodes the burner and boiler and forms sulphur dioxide, and the water condenses in the gas line. Conditioning removes both and steadies the supply pressure.
Which scrubber suits distillery biogas?
CRA selects the scrubber from the sulphur load and the outlet the boiler needs. For the heavy loads typical of spent wash, CRA uses the chemical scrubber with biological regeneration, which cuts caustic use by up to 90%.
Does the gas need to be dried for a boiler?
Drying keeps condensate out of the gas line and burner and helps the burner hold a stable flame. CRA's dehumidifiers cool the gas so the water condenses and drains.
Can the conditioned gas also feed an engine or a CBG plant?
Yes, with further treatment. Engines and CBG plants need lower H₂S than a boiler, so CRA adds polishing or upgrading stages for those uses.
What data does CRA need to size a boiler gas conditioning train?
CRA needs the biogas flow range, its H₂S content, the boiler and burner details and the site conditions.