efita.org

Oxidation is often called "burning". All volatile organic compounds can be processed by total oxidation in inorganic compounds .Now different types of thermal oxidizer equipment are used for oxidation. Lots of company provides thermal oxidizer service. People can easily get thermal heating services from those service companies. According to the elemental composition of the volatile organic compound to destroy the compounds formed are either only CO 2 and H 2 O or a mixture containing CO 2, H 2 O but also the products of oxidation of other atoms (N g NO chloreg HCl, SO 2 Sg ...). These are secondary pollutants that must be taken into account.

Several parameters are important to

• The temperature must be above the point of autoignition or VOCs, but not too high to limit the production of NOx,
• The activation energy: it can be reduced in the presence of a catalyst
• Oxygen content: it must always be sufficient for the reaction can occur (homogeneous mixture),
• Turbulence: it improves the convection heat and ensures a homogeneous distribution of temperature thus avoiding the creation of cold spot,
• The residence time: it must be good enough for oxidation
• The concentration of pollutants: it is imposed by the upstream process. However it is preferable that it is not too weak to limit the intake of extra gas needed to maintain the oxidation temperature.

What constitutes an incinerator?

The incinerator consists of several elements:

• a combustion chamber (with or without catalytic bed) where oxidation occurs,
• a burner fueled by the extra gas needed to maintain the oxidation temperature,
• a heat exchange system to use energy generated during the oxidation of VOCs to heat the effluent to be treated.

There are two families of incinerators, whether thermal or catalytic, which differ in the way of energy recovery: the recuperative incinerators and regenerative incinerators.

The regenerative incinerator implements a heat exchanger whose primary conventional thermal efficiencies are between 60 and 70%. The incinerator is characterized by regenerative exchangers based ceramics that improve energy recovery (95%) which allows more heat to the incoming effluent. Thus the VOC concentrations necessary to reach the threshold of autothermal (operation without gas booster) are lower.

Catalytic oxidation

The presence of a catalyst in the combustion chamber lowers the activation energy and thus to work at temperatures much lower than in the case of thermal oxidation (250-400 ° C instead of 750 -800 ° C). We limit the consumption of energy.

The term catalyst refers to both:

- An active species: it differs in that 2 major types of catalysts, catalysts based on precious metals (platinum, palladium, rhodium, ...) or metal oxides (containing Cr, Fe, Mo, W, Mn, Co, Cu, Ni)

- And an inorganic carrier such as alumina, which is deposited the active species.