A vertical pipe gushing boiling seawater evaporator

Abstract

The invention discloses a vertical tube seawater spewing and boiling evaporator, and belongs to the technical fields of seawater desalination and heat exchangers. The evaporator has a tower structure; the lower end of a heat exchange box is fixedly connected with a lower tube box, and the lower end is fixedly connected with an upper tube box; and the lower tube box is communicated with the upper tube box through an evaporation tube bundle and a down pipe. When the evaporator works, seawater in the evaporation tube bundle is heated by a shell pass fluid to reach a spewing evaporation state, sothat the seawater and steam are naturally separated under the action of gravity, and the separated steam bypasses an anti-impact plate, passes through a wire mesh demister and is discharged through asecondary steam outlet. The evaporator is not provided with a seawater spraying facility or a film forming mechanism, the seawater enters the equipment from the lower part of the equipment, the feed pump head is reduced, the power consumption of the pump is reduced, and the evaporator has a simple structure and works reliably; a shell pass heating medium can be subjected to constant-temperature heat exchange through steam condensation and also can be subjected to temperature reducing heat exchange by a single-phase fluid; the seawater in the tube scours upwards at a high speed, and the seawater scaling property is reduced; and the evaporator has higher coefficient of heat transfer, and can be widely applied to a small seawater desalting device.

Description

technical field [0001] The invention relates to a vertical pipe gushing boiling seawater evaporator. The evaporator is composed of vertical tube bundles and is a seawater desalination device in which seawater gushes upwards and evaporates in the vertical pipe. The invention belongs to the technical field of seawater desalination and heat exchanger. technical background [0002] The multi-effect evaporation seawater desalination device is a device that combines seawater evaporators for seawater desalination, and its main equipment is the evaporator. In the evaporator, the heating medium releases heat so that the seawater is heated and evaporated, and fresh water is produced after condensation. Currently existing seawater evaporators include submerged evaporators, vertical tube falling film evaporators and horizontal tube falling film evaporators. The structure of the submerged evaporator is simple, but the heat transfer temperature difference is large and the heat transfer ...

AI Technical Summary

Problems solved by technology

[0004] Horizontal tube falling film evaporator is a technology with high heat transfer coefficient among seawater evaporators, but in use, in addition to ensuring uniform liquid distribution, this technology is suitable for small temperature difference heat transfer and boiling evaporation caused by large temperature difference heat transfer Potential to undermine its high heat transfer coefficient advantage, also prone to localized drying out and fouling

In addition, it is generally suitable for the occasion of steam heating. For the occasion of liquid heating, due to the temperature change of the liquid during the heating process, it will also have an adverse effect on the falling film evaporation process.

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