Double-effect combined inverted-cone-shaped graphite falling film evaporator

Abstract

The invention discloses a double-effect combined inverted-cone-shaped graphite falling film evaporator, and belongs to the field of falling film evaporators. The double-effect combined inverted-cone-shaped graphite falling film evaporator comprises a shell; an upper disc and a lower disc are fixedly connected in the interior of the shell; the upper disc is positioned on the upper side of the lowerdisc; a plurality of uniformly distributed heat exchange tubes are arranged in the shell; and the upper ends and the lower ends of the heat exchange tubes penetrate the upper disc and the lower disccorrespondingly and are fixedly connected with the interiors of the upper disc and the lower disc. The cloth film thickness can be reasonably set according to the characteristics of viscosity, flowingproperty and the like of the feed liquid; the feed liquid can smoothly flow along the inner walls of the heat exchange tubes in a film shape; uniform film distribution of the feed liquid in the heatexchange tubes is ensured; compared with a conventional falling film evaporator, the provided falling film evaporator has better adaptability; the problem that feed liquid scales in the heat exchangetubes are difficult to clean is solved by arranging line connection type cleaning columns in a liquid separation groove, multiple heat exchange tubes can be efficiently and synchronously cleaned, andthe falling film evaporator can be well used for multiple times in cycle.

Description

technical field [0001] The invention relates to the field of falling film evaporators, in particular to a double-effect combined inverted conical graphite falling film evaporator. Background technique [0002] Falling film evaporation is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and distribute it evenly into each heat exchange tube through the liquid distribution and film forming device. flow up and down. Due to the good anti-corrosion performance of graphite materials, it is widely used in some high-corrosion industries and fields. Graphite falling film evaporators use steam heating and evaporation. The parts of the equipment that are in contact with corrosive media are made of impregnated graphite, which is chemically stable. Good performance, high evaporation efficiency. [0003] The feed liquid distributor is a key part of the falling film evaporator. The feed liquid enters the feed liquid distributor from the...

AI Technical Summary

Problems solved by technology

When the material liquid cannot evenly wet the inner surface of all the heating tubes, the surface of the lack of liquid or the lack of liquid may be scaled due to evaporation, and the scaled surface in turn blocks the flow of the liquid film, thereby reducing the heat transfer in the adjacent area. Conditions deteriorate further

[0005] Due to the different viscosities and flow properties of different feed liquids, it is necessary to consider the influence of the thickness of the film on the uniform film distribution effect when distributing the film to ensure that it flows smoothly, is not easy to clog and the film is evenly distributed, but the existing graphite reduces the It is difficult for the film evaporator to adjust the thickness of the film, that is, it is necessary to use different types of falling film evaporators for different types of feed liquids. In addition, the treatment of the fouling of the feed liquid in the heat exchange tube of the evaporator is still a big problem

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