Thermal Oxidizers for Pyrolysis Off-Gas
Thermal oxidisers that destroy pyrolysis off-gas continuously, paired with an enclosed flare for the moments the oxidiser cannot run.
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Continuous destruction of pyrolysis off-gas, with a flare for oxidiser trips
CRA's thermal oxidisers destroy pyrolysis off-gas continuously at a controlled temperature, including streams that carry condensable compounds. Every oxidiser for this duty comes with an enclosed ground flare as the safe disposal route, so the process gas has somewhere to go if the oxidiser trips. Heat can be recovered from the exhaust where the process can use it.
Destruction efficiency
Above 99%
Trip route
Enclosed ground flare included
Heat recovery
Where the process can use it
Operation
Fully automatic
What does a thermal oxidiser do at a pyrolysis plant?
A thermal oxidiser burns the plant's off-gas at a controlled temperature for long enough to destroy its combustible gases, VOCs and condensable compounds before the exhaust leaves the stack. At a pyrolysis plant it runs continuously alongside the process to keep emissions within the permit.
How it works
The off-gas goes to the oxidiser in normal operation, and to the enclosed flare whenever the oxidiser cannot take it.
Off-gas from the pyrolysis process is collected and sent to the oxidiser.
The oxidiser burns the off-gas at a controlled temperature, with support fuel when the gas is lean.
The exhaust leaves through the stack once the combustible compounds have been destroyed.
If the oxidiser trips, the gas goes to the enclosed ground flare so the plant does not vent.
Where the process has a use for heat, it can be recovered from the oxidiser exhaust.
Key Benefits
The oxidiser destroys the off-gas stream continuously at a controlled temperature.
An enclosed ground flare takes the gas whenever the oxidiser trips, so the plant does not vent.
Each oxidiser is designed for the plant's own off-gas, including its condensable content.
The oxidiser, the flare and the burner management system run under one control philosophy.
Heat can be recovered from the oxidiser exhaust where the process can use it.
Projects That Push Boundaries
Skid-mounted thermal oxidiser for lean, VOC-laden pyrolysis off-gas, designed in line with UKCA requirements.
Single-package BMS, burner and enclosed flare engineered for a highly variable pyrolysis vapour stream.
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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Sizing tools, decision guides, and technical references. Use them before, during, and after your evaluation.
Frequently Asked Questions
Why does CRA supply a flare with every pyrolysis thermal oxidiser?
An oxidiser can trip, and the process gas still needs a safe destination when it does. CRA supplies an enclosed ground flare as the disposal route for that case.
Which type of thermal oxidiser suits pyrolysis off-gas?
Direct-fired oxidisers suit most pyrolysis off-gas streams because they handle condensable and variable gas well. CRA confirms the choice once it has the gas data.
Can heat be recovered from the oxidiser?
Yes, where the process has a use for it. CRA assesses heat recovery against the plant's heat demand.
What data does CRA need for an oxidiser offer?
CRA needs the off-gas flow range, its composition, its temperature and pressure, the permit limits and the site conditions.
Does CRA supply the burner management system?
Yes. CRA supplies the burner management system and integrates it with the oxidiser and the flare.