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.
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.
The principal elements of this plant are:
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:
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.
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.
Pretreatments are used to preserve the thermal oxidizer, reducing the concentration of particular types of pollutants which may compromise their functioning, such as:
In presence of these pollutants, it is possible to install proper pretreatment systems such as:
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:
These plant solutions are applicated in the following fields:
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.
All the BrofindⓇ direct thermal oxidizers can be customised and developed with dedicated plant solutions such as:
Choosing Brofind means:
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