Enclosed Flares for Landfill Closure
Enclosed landfill gas flares for closed and capped sites, with turndown up to 100:1 as the gas declines.
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Landfill gas destruction through the long decline after closure
CRA's enclosed landfill gas flares destroy the gas from closed and capped sites with turndown up to 100:1, so combustion stays stable as the flow falls year after year.
Destruction efficiency
>98%
Turndown
Up to 100:1
Standards
EPA NSPS/EG, API 537
Operation
Unattended
What does a flare do at a closed landfill?
After capping, the gas collection system keeps drawing gas from the wells and sends it to the flare, where it burns at ground level inside an enclosure. As the waste ages, the flow and methane content fall, and the flare's automatic controls follow the falling flow to hold the combustion temperature that the destruction efficiency relies on.
How it works
The flare connects to the site's gas collection system and runs unattended for long periods between visits.
The collection system draws gas from the capped waste.
The flare lights and proves its flame automatically.
The gas burns at ground level, with the flame out of sight.
Automatic control follows the gas flow as it declines.
On a fault, the flare shuts down safely and raises an alarm.
Key Benefits
The flare holds a stable flame as the gas flow falls over the years.
Enclosed combustion destroys more than 98% of the methane sent to the flare.
Automatic start, flame proving and shutdown suit closed sites that are rarely staffed.
Materials are selected for the H₂S, moisture and siloxanes in landfill gas.
The exhaust can be sampled to report emissions under the site's permit.
Projects That Push Boundaries
CRA's first Sub-Saharan Africa landfill gas installation, delivered under a single contract from design through commissioning.
Enclosed ground flare system for MCGM's Gorai dumpsite closure, commissioned and in continuous operation since.
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 a closed landfill still need a flare?
Waste keeps producing gas for many years after a landfill is capped. Collecting and burning it controls odour, lowers the risk of fire and gas migration and cuts methane emissions.
What turndown does a closure flare need?
Gas flow at a closed site falls steadily over the years, so the flare needs a wide operating range. CRA's landfill gas flares offer turndown up to 100:1.
Can an oversized flare be replaced?
Yes. Where the original flare is now too large for the gas that remains, CRA can supply a flare sized for the present and projected flows.
Which standards do the flares follow?
CRA's landfill gas flares are designed in line with EPA NSPS/EG and API 537, with destruction efficiency above 98%.
What data does CRA need to size a landfill closure flare?
CRA needs the present and projected gas flow, the methane content, the collection system pressure and the site conditions.