Evaporator for low-temperature multi-effect seawater desalination system

Abstract

The invention relates to an evaporator for a low-temperature multi-effect seawater desalination system. The evaporator comprises a tank body and a heat exchange mechanism fixedly connected in the tankbody, the tank body is fixedly connected with a liquid inlet pipe, and the tank body is fixedly connected with a secondary steam pipe and a liquid discharge pipe; the heat exchange mechanism comprises a heat exchange pipe assembly, a shell and a crystallization induction assembly, the heat exchange pipe assembly comprises a plurality of heat exchange pipes which are vertically arranged, the crystallization induction assembly is detachably installed on the heat exchange pipes, and the crystallization induction assembly comprises induction ropes fixedly connected with seawater crystalline saltpowder. Each heat exchange pipe is internally provided with the corresponding induction rope, and the induction ropes make contact with the inner walls of the heat exchange pipes. The effect of relieving the influence of salt deposit on the evaporation efficiency of the evaporator is achieved.

Description

technical field [0001] The present application relates to the field of seawater desalination, in particular to an evaporator for a low-temperature multi-effect seawater desalination system. Background technique [0002] Low-temperature multiple-effect distillation (LT-MED) seawater desalination technology refers to seawater desalination technology with a maximum evaporation temperature of about 70 degrees Celsius. It is characterized in that a series of horizontal tube falling film evaporators are connected in series and divided into several effect groups. A certain amount of steam is input through multiple evaporations and condensations to obtain distilled water that is multiple times the amount of heating steam. It is characterized by low pretreatment requirements for raw seawater, low process cycle power consumption, and high quality fresh water produced. Therefore, this technology has been widely used in the world after it was developed, and it is one of the most promis...

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Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that part of the seawater evaporates into water vapor in the multi-effect evaporator, and the remaining part of the seawater will be concentrated into concentrated seawater with higher salt content, because the salt content of seawater increases, the Salt is more likely to crystallize and form salt scale in the evaporator, so there is a problem that salt scale is easily attached to the evaporator, resulting in low evaporation efficiency

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