Horizontal tube falling-film evaporator with flow guiding device and secondary liquid-dispensing device

Abstract

The invention discloses a horizontal tube falling-film evaporator provided with a guiding device and a twice-liquid distributing device, comprising a horizontal tube falling-film evaporator, which is characterized in that the horizontal tube falling-film evaporator is provided with a guiding device which is arranged at the end of a evaporating tube correspondingly, inside the evaporating tube is provided with a twice-liquid distributing device which is arranged between two adjacent rows of evaporating tubes which are used to compose an exhaust passage. The horizontal tube falling-film evaporator with the guiding device and the twice-liquid distributing device provided by the invention has the advantages of the stable flowing liquid in the evaporating tubes, columnar flow being kept to a maximum extent, phenomena such as splashing, departure, partial dry being avoided and being able to improve heat transfer efficiency effectively.

Description

technical field [0001] The invention belongs to the technical field of evaporator design, and relates to a horizontal tube falling film evaporator with a flow guiding device and a secondary liquid distribution device. Background technique [0002] The traditional horizontal tube falling film evaporator is mainly composed of liquid distributor, horizontal tube bundle, external shell and other components. The liquid distributor is located on the upper part of the entire horizontal tube falling film evaporator. After the liquid working fluid is distributed by the liquid distributor, a layer of uniform liquid film is formed outside the horizontal tube bundle and flows downward along the tube bundle. During this process, the liquid working medium The heat exchange between the mass and the hot fluid in the tube undergoes a phase change. The horizontal tube falling film evaporator has the advantages of high heat transfer coefficient, small heat transfer tem...

AI Technical Summary

Problems solved by technology

1. Since the collector is wrapped in the main gas-producing area of ​​the evaporator tube, the gaseous working medium must pass upward through the liquid in the collector and be discharged from the narrow space between the upper half of the tube and the collector, which requires more resistance to be overcome , for low heat flux, the bubbles are not easy to overflow, which may reduce the overall heat transfer effect; 2. Due to the existence of the liquid collector, the evaporation tube, the liquid collector and the overflowing liquid working medium on the same horizontal plane are integrated into one , forming an airtight isolation layer, which prevents the gaseous working medium from rising along the tube row, and can only flow upward from both sides of the shell, which may increase the energy loss of steam discharge; 3. The processing technology of the liquid collector is complicated, Installation is also relatively difficult, which will increase the cost and is not conducive to promotion

Images