A falling film evaporator

Abstract

The invention relates to a falling-film evaporator, belonging to the field of heat exchangers. The falling-film evaporator comprises an enclosed shell, wherein the interior of the shell is successively divided, from top to bottom, into four areas, i.e. a feeding area, an evaporation area, a cooling area and a discharging area, by an upper end plate, a middle end plate and a lower end plate; the side wall of the shell in the feeding area is provided with a feed inlet; the side wall of the shell in the discharging area is provided with a discharge outlet; the side wall of the shell in the cooling area is symmetrically provided with a cooling water inlet and a cooling water outlet; a plurality of heat exchange pipes are vertically arranged inside the shell; the top ends of the heat exchange pipes penetrate the upper end plate located in the feeding area; the lower ends of the heat exchange pipes penetrate the lower end plate and are then positioned in the discharging area; and the outer walls of the heat exchange pipes in the evaporation area are coated with an electroheating coating. The falling-film evaporator provided by the invention has simple structure, excellent evaporation efficiency and a wide application scope and is applicable in environments with harsh working conditions like high temperature, high pressure, strong acid and alkali corrosion.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a falling film evaporator. Background technique [0002] Falling film evaporators are widely used in the concentration and evaporation of production liquids in pharmaceutical, food, light industry, petrochemical, metallurgical and other industries. At present, most falling film evaporators use high-temperature steam to circulate outside the evaporation tube, and use tube wall heat exchange to heat and evaporate liquid. However, the high-temperature steam heating method has inherent disadvantages. First, the heating temperature is limited. If the temperature is too high, the equipment cost will be too high and the risk factor will increase; Long-term high-temperature steam atmosphere is easy to cause corrosion and damage to equipment; Fourth, steam heating efficiency is low and energy consumption is high. Contents of the invention [0003] The purpose of the present invention is...

AI Technical Summary

Problems solved by technology

However, the high-temperature steam heating method has inherent disadvantages. First, the heating temperature is limited. If the temperature is too high, the equipment cost will be too high and the risk factor will increase; Long-term high-temperature steam atmosphere is easy to cause corrosion and damage to equipment; Fourth, steam heating efficiency is low and energy consumption is high

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