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Regenerative thermal oxidation plants


Design and construction of regenerative thermal oxidadation (RTO) plants for safeguarding the environment..
We can offer a wide range of solutions and services to meet the needs of customers about environmental issues and comply with the laws relating to air emissions.
The regenerative thermal oxidation plant allows the oxidation of volatile organic compounds (VOC) increasing the temperature of the polluted air over the 750 ÷ 800 ° C with a heat recovery system with high efficiency by ceramic material.
The regenerative thermal oxidation plant is usually composed of 3 towers.
In case of high air flow rate it can also be realized with 5 towers.
Each tower contains ceramic material that, depending on the direction of gas flow, absorbs or transmits the heat to the ceramic blocks.
The polluted air coming from the process is induced by the fan through the bed of the chamber 1 and goes out, after the oxidation of pollutants in the combustion chamber, through the bed of the chamber 2.
During this phase, while the ceramic block of the chamber 1 has been cooled and the one of the chamber 2 is heated, the chamber 3 has been fluxed and the residues of the previous cycle have been sent back to the system inlet.
After a certain period of time, a reverse flow has been done.
The average time of a cycle varies from 60 to 120 sec., according to the nature and concentration of the pollutants.
The oxidation temperature, normally around 800° C, has been keeped by the heat produced by the oxidation of pollutants or, if the latter has insufficient quantities to self-sustaining, with the addition of fuel.
In the case of, due to high concentrations of pollutants, there is the possibility of having residual heat from the flue gas, it can be possible the installation of recovery heat systems.

Other available technologies are  recuperative thermal oxidation and catalytic thermal oxidation (CTO).
The recuperative thermal oxidation allows the purification of polluted air by thermal oxidation at high temperature, usually between 750 and 850° C.
The heat recovery is carried out by an air-to-air exchanger.
It is suitable in cases of high concentrations of organic pollutants, and in particular in cases where other systems are not suitable.
If there is an excess of heat, it is possible to install an additional heat recovery for the production of steam or diathermic oil heating/hot water.
The catalytic oxidation is a process that allows the oxidation of organic compounds at a reduced temperature compared to conventional oxidation, normally between 250 and 350° C, by a special catalyst.
The polluted air has been preheated using a suitable heat exchanger for reducing the fuel consumption.
this process is suitable in case of medium/high concentration.