Thermal destruction of one organic or organo-halogenic product in liquid, gaseous or powder form, comprises mixing with water, mixing with plasmagenous gas and then mixing with air and/or oxygen for second thermal destruction

摘要

An organic (or organo-halogenic) product is mixed with sufficient water to at least satisfy the stoichiometric ratio of carbon to oxygen atoms (and of hydrogen to halogen atoms). The mixture is mixed with plasmagenous gas in an inductive plasma torch coil (6) to decompose it to atoms (7). The gases are mixed with air and/or oxygen (8) for a second thermal destruction without energy input. At least part of the gases from the mixing device are recombined by cooling (10) and the destroyed gases are ejected (20). The mixture of at least one organic or organo-halogenic product with water is introduced at the level of the coil of the inductive plasma torch in droplet form if the product is liquid or powder and in gaseous form if the product is gaseous. The mixing device (8) is a venturi. An additional cooling stage (17) allows the recombined gases from the first cooling stage to exchange heat with the surrounding environment. There is an analysis stage (12) for the gases leaving the recombination stage and a stage of regulating the pressure of the gas using a vacuum pump. At least one chemical treatment stage, selected from dehalogenisation (14), de-oxidation of nitrous oxides (16) and desulfurisation, is included. A spray (13) of water on the gases is carried out before the chemical treatment stage. An independent claim is included for a device to carry out this process, comprising an inductive plasma torch; means of introducing plasmageous gas into the torch; means of introducing a mixture of water and at least one organic or organo-halogenic product into the torch; a reaction chamber which allows thermal destruction of the gases leaving the inductive plasma torch; a device for mixing the gases leaving the reaction chamber; means of introducing air and/or oxygen into the mixing device and means of allowing recombination by cooling of at least part of the gases from the mixing device. The inductive torch is connected to the reaction chamber, which is connected to the mixing device, which is connected to the recombination device. The device includes common means (11) of cooling the inductive plasma torch, the reaction chamber, the mixing device and the recombination device. The reaction chamber is double-walled, with the cooling water circulating in the double wall and the internal surface of the double wall is covered with a refractory material. The plasmagenous gas is introduced into the torch by pressurisation. The mixture of water and waste is introduced by a spraying probe if the mixture is liquid and an injection probe if it is gaseous. The mixing device is a venturi with a double wall cooled by water, with an upper convergent part, a lower divergent part, a neck connecting the convergent and divergent parts and air inlet orifices. The recombination device is a double-walled chamber cooled by water.