Direct thermal oxidizers can be regarded as normal combustion chambers in which the gaseous stream, loaded with pollutants, is burned directly, without any heat recovery.
The direct thermal oxidizers represent the simplest plants of the oxidizers group: in them, the polluted air is conveyed in a combustion chamber where, thanks to one or more burners, a temperature of 720-950°C is maintained to allow the proper pollutants combustion and the complete flow purification.
Direct thermal oxidizers: advantages
- High purification efficiency (>99%).
- Limited size and weight.
- Limited production of secondary pollutants such as carbon monoxide and acid gases (CO, NOx).
- Complete telematic management: electric panel with PLC and remote assistance.
- Independent combustion system to guarantee the proper plant functioning.
- Modulating combustion system to keep the correct operating temperature at different inlet pollutant loads.
- Combustion chamber internally equipped with high density ceramic fibre insulating refractory materials, to ensure a higher plant duration even with high concentration effluents or halogenated streams.
- Turnkey supply.
Direct thermal oxidizers functioning principles
It is possible to equip the direct oxidizers with pretreatment and after treatment sections to treat the more complex pollutant flows with more different technologies.
Pretreatment systems
Pretreatments are used to preserve the thermal oxidizer, reducing the concentration of particular types of pollutants which may compromise their functioning, such as:
- organic silicon compounds
- inorganic acids
- inorganic bases
- aerosol
- dusts
- painting oversprays
- oil mists and/or condensate microdroplets
In presence of these pollutants, it is possible to install proper pretreatment systems such as:
- cyclones, bags or cartridge filters and Venturi scrubbers for dusts filtration or abatement
- tower scrubbers for inorganic acids and bases abatement
- activated carbon adsorbers for compounds selective filtration
- demisters for H2O concentrations reduction
- more complex systems, to be evaluated case by case
After treatment systems
In the field of pretreatment systems, quick cooling technologies, such as quenchers, often followed by tower scrubbers, are preferred.
In case of necessity to reduce nitrogen gases, such as NOx, it is possible to use deNOx, SCR or SNCR after treatment systems.
After treatment systems are often applicated when it is needed to treat pollutants such as:
- halogenated VOC
- sulphur VOC
- nitrogen VOC
- silanes or siloxanes
Electric Thermal Oxidizers – OxyTherm Eco2
The electrically powered regenerative thermal oxidizer has the ability to utilize the thermal energy generated during combustion to reduce operational costs and energy consumption of the system itself. Thanks to its high energy recovery, regenerative systems are particularly suitable for applications with low concentrations of VOCs.
Our innovative electric thermal oxidation systems effectively destroy a variety of hazardous industrial pollutants with a destruction efficiency of over 99%.
Features and advantages of electric thermal oxidizers
- No CO2 production from fuel.
- No gas connection required.
- Compact, integrated design with easy installation.
- Possibility to fully test the system, even hot, in the workshop before shipping.
- High VOC destruction efficiency >99%.
- High thermal recovery efficiency and low energy consumption, even with the use of photovoltaic panels.
- Low maintenance and very high reliability (usage rate >99%).
Typical applications and target sectors
These plant solutions are applicated in the following fields:
- chemical
- pharmaceutical
- oil&gas
- waste treatment
BrofindⓇ direct thermal oxidizers allow to treat gas flows with high pollutants concentrations (up to 50% of the LEL – Lower Explosive Limit) or nitrogen-inerted effluents, which will have to be properly treated by means of, for example, air insufflations in combustion chamber.
Dedicated plant solutions development
All BrofindⓇ direct thermal oxidizers can be customised and developed with dedicated plant solutions such as:
- Heat recovery downstream the combustion chamber, thanks to specific heat recovery solutions.
- Possibility to install scrubbers for high temperatures for the treatment of acid smokes and corrosive gases.
- Possibility to install standard quenchers or special Alloy quenchers for corrosive gases.
- Use of low NOx emission special burners.
- Use of SCR (Selective Catalytic Reduction) deNOx systems to reduce nitrogen-based acid gases.
- Complex streams injection in combustion chamber to reach specific abatement values.
