Mixer cooler

Claim 1

A mixer-cooler, comprising a mixing vessel into which a substance to be mixed may be introduced, a mixing tool arranged therein and designed to rotate about a vertical axis, the mixing vessel having internal and external walls defining between them a cavity through which a coolant flows, the mixing tool being configured to propel the substance radially outwardly along the base of the vessel and thereafter up the internal wall of the vessel, a coolant inlet in the base of the vessel and a coolant discharge near the upper rim of the vessel, guide elements in said space to guide the coolant on its passage between the coolant inlet and the coolant discharge in a direction generally corresponding to the direction of propulsion of the substance, the guide elements subdividing the cavity of the double wall into a coolant duct extending in labyrinthine fashion from the coolant inlet to the coolant discharge in at least the radially Outer zone of the base-side cavity of the double wall, the flow duct consisting of concentric duct sections formed by guide baffles extending substantially concentrically to the vessel axis each of which duct sections extends over a centrally subtended angle of around 360* and communicates through a radial transfer orifice with the particular adjacent, radially outer duct section in a series disposition, the flow duct in the side wall zone of the double wall being made up of duct sections defined by guide baffles arranged coaxially, at intervals, parallel one above the other in the cavity, each of said duct sections extending over a centrally subtended angle of 360* and communicating through an axial transfer orifice with the particular adjacent, axially upper duct section in a series disposition.