Liquid distributor and liquid distribution method for steam forced circulation and vacuum energy-saving evaporator

Abstract

The invention discloses a liquid distributor of a forced vapor circulation and vacuum energy-saving evaporator. The liquid distributor comprises a liquid distributor shell, wherein a tube plate is arranged at the top of the liquid distributor shell; a plurality of first through holes are formed in the tube plate; a guide tube is longitudinally connected with the lower surface of the tube plate; a liquid distribution disc is fixed inside the liquid distributor shell; second through holes are formed in the liquid distribution plate of the liquid distribution disc; the diameters of the second through holes are greater than the outer diameter of the guide tube; the lower end of the guide tube extends outside the bottom of the liquid distributor shell and extends into a heat exchange tube. The invention further discloses a liquid distribution method. By adopting the liquid distributor, repairing and maintenance of the evaporator, the design distance between the guide tube and the heat exchange tube and replacement of elements can be facilitated, a circular lubricating water membrane can be formed outside the guide tube and can be fed into the heat exchange tube, stock solution vapor can be relatively efficiently generated, the guide tube is stable and reliable in structure, crystal blocks can be avoided as a tube expansion tube of the guide tube is coated by a polytetrafluoroethylene anti-crystallization coating, and thus the heat exchange tube can be prevented from being internally blocked because of crystallization.

Description

technical field [0001] The invention relates to an evaporator, in particular to a liquid distributor of a steam forced circulation and vacuum energy-saving evaporator and a liquid distribution method implemented by the liquid distributor of the steam forced circulation and vacuum energy-saving evaporator. Background technique [0002] The existing tube-and-tube falling film evaporator generally has a complete shell in which there are heat exchangers, liquid distributors, raw liquid steam exhaust pipes, etc., and it is difficult to repair when a fault occurs. , it is difficult to replace the components. Moreover, the structural design of the liquid distributor in the existing tube-and-tube falling film evaporator is not reasonable and perfect. The liquid distributor adopts point-shaped small holes outside the draft tube to self-flow and distribute the liquid, and it is difficult to form a continuous and balanced flow in the heat exchange tube. The circular falling film often...

AI Technical Summary

Problems solved by technology

[0002] The existing tube-and-tube falling film evaporator generally has a complete shell in which there are heat exchangers, liquid distributors, raw liquid steam exhaust pipes, etc., and it is difficult to repair when a fault occurs. , it is difficult to replace the components

Moreover, the structural design of the liquid distributor in the existing tube-and-tube falling film evaporator is not reasonable and perfect. The liquid distributor uses point-like small holes outside the draft tube to self-flow and distribute the liquid, and it is difficult to form a continuous and balanced flow in the heat exchange tube. Circular falling film often has insufficient falling film in some heat exchange tubes, which makes it difficult for the raw liquid entering the heat exchanger to quickly generate raw liquid vapor

In the existing tube-and-tube falling film evaporator, the guide tube is generally only fixed at the top, and the guide tube has a certain length, and the connection is not firm enough. After a long time of use, it is inevitable that it will be loosened by the vibration of the airflow during the steam heating process. , Cracks in the welding part, resulting in failures and potential safety hazards

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