PL416745A1 - Method for densification of solutions and the device for densification - Google Patents

Abstract

The subject of the invention is a method of obtaining a very high degree of use of feed steam in the concentration of solutions, in evaporators, consisting of many conical rotating evaporative assemblies and a device for such concentration. In the method, the concentrated solution is distributed to six or more conical evaporation surfaces, combined with cascade heat release, with the concentrate selected from the evaporative stages separately and combined with the original solution fed to the device. In addition, the solution at the base of the evaporation cones flows perpendicular to the radius of their rotation, causing a vortex in the distribution space. The evaporation device consists of one or several rotating multi-stage evaporative assemblies, in the shape of inverted truncated cones, circumferentially closed with monolithic walls (6), and axially joined edges permanently connected to cylinders (7), with a diameter much larger than the shaft (15), having holes (8) supplying the thickened solution, each conical evaporation surface and the molded (9) outermost, tightly, on the supporting element (16) of the hollow shaft (15), with lateral openings, connected on one side with the supply head to the concentrated solution, on the other with a steam head. In the closed space between the shaft (15) and the cylinders (7) they are sealed tightly with the holes (8) for supplying the rollers (22) to the valves. Outlets of the final thickened solution, outlets of the pre-concentrated solution and condensate outlets exit from the walls (6). Their edges respectively enter the space of vertical flow troughs, with overflows, attached to the circular edges of the (16) support and (19) upper elements. Collectively, a U-tube effect is obtained for each string of connections. Overflows in the centrifugal bottoms of the troughs have outlet holes of the pre-concentrated and finally concentrated solution at appropriate heights, such that the pre-concentrated solution is captured by the cylinder (33), and the finally concentrated solution is thrown onto the wall (49) of the side vapor chamber housing. The applied solutions make it possible to construct devices with an increased number of evaporative stages while maintaining economic efficiency, because all evaporative stages have the same, very high heat transfer coefficient. The constructions have a very wide spectrum of applications due to the second compaction time and overcoming the limitations resulting from the high viscosity of the concentrate.