Falling film evaporator

Abstract

The invention discloses a falling film evaporator. A heat exchanger (1) is formed by sequentially arranging a plurality of heat exchange units from front to back; a wave-shaped fluid channel (1b) is formed between two layers of thin films (1a) of the heat exchange units; a water outlet (1c) is arranged at the lower end of each heat exchange unit; a water collector is mounted in the water outlet (1c); a film distributor is arranged at the top of the heat exchanger (1); water distributors (3) are symmetrically arranged at the left side and the right side of the film distributor; and liquid outlets at the upper ends of the water distributors (3) are communicated with water inlets (2b) of river diversion channels (2a) at the corresponding sides. The falling film evaporator provided by the invention is simple in structure; main components are combined pieces; and the falling film evaporator is convenient to maintain and replace. The heat exchange temperature difference of the heat exchanger is small, so that the heat exchange effect can be ensured, and the operation energy consumption of the whole system is greatly reduced. A stable and uniform liquid film can be ensured to be formed on the surface of the heat exchanger through the film distributor, so that the height sensitivity level of a liquid layer is low, the operation elasticity is large, the pressure fall is small, difficulty in blocking can be realized, and the energy conversation effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of evaporators, and in particular relates to a falling film evaporator. Background technique [0002] The evaporation process is widely used in the existing petroleum, chemical, food and wastewater treatment industries. At present, the evaporators used in various industries are all made of metal. According to the different materials to be processed, the metal materials used are also different. Among them, carbon steel, stainless steel, and titanium are the most commonly used metal materials for evaporators. [0003] The following problems exist in the design, processing and operation of metal evaporators: [0004] 1) The structure is complex and difficult to process; [0005] 2) The amount of metal materials used is large and the investment cost is high; [0006] 3) The heat transfer area per unit volume is small, the temperature difference required for heat transfer is large, and the heat transfer effect...

AI Technical Summary

Problems solved by technology

[0004] 1) The structure is complex and difficult to process;

[0005] 2) The amount of metal materials used is large and the investment cost is high;

[0006] 3) The heat transfer area per unit volume is small, the temperature difference required for heat transfer is large, and the heat transfer effect is not ideal;

[0007] 4) Easy to scale and corrode;

[0008] 5) Repair and maintenance costs are high and difficult;

[0009] 6) High energy consumption in operation

The overflow type has high requirements for processing and installation accuracy; the plug type has large flow resistance, is easy to block, and is inconvenient to install and maintain, and is only suitable for cleaning materials; the porous plate type is inferior to the former two.

Therefore, the existing falling film evaporator is prone to uneven water distribution and dry plate, which not only consumes high energy consumption, but also takes up a lot of space in the evaporator

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