Direct oxidizers

Thanks to its characteristics, this plant can be adapted to different special applications where it is necessary to reduce pollutants with high concentration, to use reagents injections in the combustion chamber and to realize a complete incineration. The spatial configuration, that is the way the plant is designed according to the installation site, can be with horizontal or vertical development and, in the latter case, the release stack is integrated in the combustion chamber.

Which are the principal elements of the direct thermal oxidizer?

The principal elements of this plant are:

• the burner, bringing and maintaining the airflow at a proper temperature and burning the pollutants contained in it
• the combustion chamber, allowing to hold the gas flow for a defined residence time, as to destroy the pollutants in it
• the eventual heat recovery, reusing the high-temperature cleaned effluent from the oxidizer combustion chamber, as to realise an energy saving
• the eventual pretreatment or after treatment systems for specifical technical problems resolution

To obtain the desired result in terms of pollutant treatment, the combustion chamber dimensioning and the burner choice are defined according to the burner choice are defined according to the reference technical parameters listed below:

• speed
• airflow
• temperature
• turbulence
• residence time
• flame development volume

To permit fully working conditions plant management and without the necessity of a complex training for the plant operator, our direct oxidizers are ordinarily equipped with a temperature measuring system, assisted by a board with PLC.

Direct thermal oxidizers with pretreatment and after treatment systems

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

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.