Vertical falling-film heat exchanger outside pipe

Abstract

The invention discloses a vertical falling-film heat exchanger outside a pipe, which comprises a heat exchanger shell, a reinforced heatexchange tube bundle, a film distributing device, a tube pass accommodating chamber, sight glasses, a fluid inlet and outlet pipeline and the like. The double-layer film distributing device is arranged at the top of a heat exchanger; and a fluid flows down uniformly along the outer wall of a pipe in a film shape through the film distributing device to take away heat of another fluid in a heat exchange tube or transfer the heat to another fluid in the heat exchange tube so as to realize heat exchange of two different fluids. Because a tangential-flow liquid introducing manner and the unique double-layer film distributing device are adopted for the heat exchanger, the problems of nonuniform film distribution, low effective heat exchange area and the like of the traditional falling-film heat exchanger are solved. By adopting the device, the mass transfer resistance of the fluid can be effectively reduced, the heat transfer and mass transfer capacities of the heat exchanger are remarkably improved, and the device can be widely applied to the industries, such as chemical industry, thermotechnical industry, light industry, food, pharmacy, metallurgy, sea water desalination and the like.

Description

technical field [0001] The invention relates to a new type of vertical falling film heat exchanger outside the tube, which is suitable for the heat and mass transfer process of heat exchange medium with various components, and can be applied to chemical industry, thermal industry, light industry, food, pharmaceutical, metallurgy and seawater desalination etc. Background technique [0002] In recent years, with the improvement of society's requirements for energy saving, various chemical and refrigeration equipment have higher and higher requirements for heat exchangers. As an efficient heat exchange device, falling film heat exchanger is widely used in evaporation, distillation and condensation equipment. The existing falling film heat exchangers are generally based on horizontal tube falling film, plate type falling film and vertical tube falling film. Falling film heat exchangers with these structures often have uneven film distribution, uneven film thickness or thermal i...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing falling film heat exchangers such as uneven film distribution and low heat transfer effect, and provide a new type of vertical falling film outside the tube that is easy to process, simple in structure, and good in heat and mass transfer. Heat Exchanger

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