Device for mixing water and diesel oil, apparatus and process for producing a water/diesel oil micro-emulsion

An apparatus for preparing a water/diesel oil micro-emulsion, comprising:

• at least one diesel oil feeding unit;
• at least one emulsifying composition feeding unit;
• at least one water feeding unit;
• at least one mixing tank in fluid communication with the at least one diesel oil feeding unit, with the at least one emulsifying composition feeding unit and with the at least one water feeding unit;
• and
• a device for mixing water and diesel oil operatively connected to said at least one mixing tank;
• wherein the device for mixing water and diesel oil, comprises:
• at least one duct for a flow of liquid, said duct extending along a main direction and presenting an inlet opening and an outlet nozzle;
• a cone-shaped septum in the duct, wherein the cone-shaped septum comprises a conical wall coaxial with respect to the main direction and tapering towards the outlet nozzle, wherein a vertex of the cone-shaped septum faces the outlet nozzle, said cone-shaped septum comprising a first plurality of through holes extending through the conical wall;
• and
• a plurality of lamellae arranged in at least a portion of the duct downstream of the cone-shaped septum, said plurality of lamellae dividing said portion into a plurality of small chambers, wherein said lamellae comprise a second plurality of through holes;
• said second plurality of through holes and said small chambers delimiting a labyrinth passageway for the flow of liquid through the duct towards the outlet nozzle.