Patent ID: 8968574
Filing Date: 2015-03-03
Classification: C02F,F28D

Abstract:
1. A method for wet oxidation treatment of liquid waste laden with mineral matter, in which a solution to be treated laden with oxidizable substances is prepared, an oxidizing gas is mixed with the solution, the mixture of solution to be treated and oxidizing gas is preheated in a first heat exchanger, the mixture of solution to be treated and oxidizing gas is heated in a reactor to temperatures sufficient to oxidize the oxidizable substances, the treated mixture is cooled in a second heat exchanger and, at an exit of the second heat exchanger, treatment gases are separated from residual minerals in the cold treated mixture before respective discharge thereof, the method comprising the steps of: dividing a stream of the hot treated mixture, at an exit from the reactor, into a first stream fragment and a second stream fragment; cooling and discharging the second stream fragment of the hot treated mixture; using the first stream fragment of the hot treated mixture to regulate a preheating temperature of the first heat exchanger; maintaining a constant flow rate of the first stream fragment of the hot treated mixture, in the first heat exchanger, regardless of a flow rate of the solution to be treated by using at least one diaphragm, located after an exit of the first hot stream fragment from the first heat exchanger; discharging the first stream fragment in the first heat exchanger; regulating the temperature of the first heat exchanger by controlling a flow of cold solution, to be treated at an entry to the first heat exchanger, as a function of the temperature of the hot solution to be treated at its exit from the first exchanger and as a function of a reactor temperature, the reactor temperature determining the temperature of the first stream fragment of the hot treated mixture before the first stream fragment is used to preheat the mixture of solution in the first heat exchanger.