CBG Gas Trains for Paddy Straw Plants
CBG gas trains for paddy straw plants, from raw biogas to 250 bar compression for cascades.
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Paddy straw biogas to CBG at 250 bar
CRA's gas train takes raw biogas from a paddy straw digester through scrubbing, drying, membrane upgrading and compression to 250 bar, ready for cascade filling.
Compression
Up to 250 bar
Product gas
IS 16087:2025
Methane slip
Below 1%
Scope
Raw biogas to cascade
What does a CBG gas train do at a paddy straw plant?
Biogas from paddy straw digesters carries carbon dioxide, moisture and hydrogen sulphide. The gas train removes the H₂S, dries the gas, separates the carbon dioxide in a membrane stage and compresses the methane-rich product to 250 bar. Each stage is designed with the next, so the gas quality holds from digester to cascade.
How it works
The train starts at the digester gas holder and ends at the cascade filling point, with a flare for surplus gas.
A scrubber removes hydrogen sulphide from the raw biogas.
Moisture is removed before the gas reaches the membranes.
Membrane upgrading raises the methane content of the gas.
The compression package raises the product gas to 250 bar.
The CBG is metered as it fills the cascades.
Key Benefits
Scrubbing, drying, upgrading, compression and metering share one design basis.
The train is designed to deliver CBG that meets IS 16087:2025.
Membrane upgrading keeps methane slip below 1%.
The train is sized for the plant's flow range through the year.
One supplier is answerable for gas quality from digester to cascade.
Projects That Push Boundaries
Removes H₂S from Biogas stream using a wet scrubber, engineered for CBG Application.
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
What does the CBG gas train include?
It includes H₂S scrubbing, gas drying, membrane upgrading, compression to 250 bar and metering, engineered together as one package.
How does the train cope with seasonal straw supply?
CRA designs the train for the plant's flow range across the year, including periods of lower gas production.
Does the product gas meet IS 16087?
The train is designed to deliver CBG that meets IS 16087:2025.
What data does CRA need for a paddy straw CBG gas train?
CRA needs the raw biogas flow range across the year, its composition including H₂S, the CBG output the plant is targeting and the site conditions.
Can CRA supply part of the train?
Yes. CRA supplies each stage on its own as well and can match it to equipment already at site.