Vertical pipe high efficiency falling-film evaporator

Abstract

The invention discloses a vertical pipe high efficiency falling-film evaporator suitable for evaporation of small flow, high viscosity and heat-sensitive materials. The vertical pipe high efficiency falling-film evaporator mainly comprises a liquid distributor, drain pipes, spiral nozzles, heat exchange pipes, fixed rods, positioning pipes, vapor-liquid redistribution elements and fixed parts. Theliquid distributor and the spiral nozzles are connected by the drain pipes, and the heat exchange pipes are internally equipped with the vapor-liquid redistribution elements. The vertical pipe high efficiency falling-film evaporator provided by the invention has the beneficial effects that: the evaporator solves the initial distribution problem of small flow and high viscosity materials, solves the problem that parts of liquid drops directly fall from a pipe center without full heat exchange because of steam flow impact in the liquid falling process, and solves the problem that high viscositymaterials flow difficultly, the liquid on the inner surfaces of heat exchange pipes cannot be renewed timely, and therefore the heat transfer efficiency of the evaporator is reduced.

Description

technical field [0001] The invention specifically relates to a vertical tube high-efficiency evaporator, which can be widely used in chemical industry, light industry, medicine, food processing and other industries, and is especially suitable for evaporating small flow, high viscosity and heat sensitive materials. Background technique [0002] Evaporation is an important chemical unit operation. As the main equipment for evaporation—the evaporator also has various forms, and for the evaporation of heat-sensitive materials, vertical tube rising film evaporators and vertical tube falling film evaporators are mostly used. However, in medicine, food processing and other industries, many of them are heat-sensitive substances with high viscosity and high boiling point, and the processing capacity is small. Traditional evaporators have high requirements for manufacturing and installation, and the treatment of high-viscosity and low-flow materials will lead to uneven initial distrib...

AI Technical Summary

Problems solved by technology

However, in medicine, food processing and other industries, many of them are heat-sensitive substances with high viscosity and high boiling point, and the processing capacity is small. Traditional evaporators have high requirements for manufacturing and installation. For high-viscosity and low-flow materials, the initial distribution will be uneven.

The liquid in the traditional standpipe heat exchange tube is impacted by the steam flow during the falling process, and many droplets fall directly from the center space of the tube instead of flowing downward along the tube wall, so that the liquid cannot be fully heated

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