Cleaning method of seawater desalination device

Abstract

The invention discloses a cleaning method of a seawater desalination device. The seawater desalination device comprises an n-effect evaporator, a brine pump and a seawater booster pump, each effect evaporator in the n-effect evaporator is provided with seawater spraying pipelines and a strong brine pipeline communicating with liquid sprayed by the seawater spraying pipelines, The cleaning method comprises the following steps that a pickling solution is injectied into the strong brine pipeline between two adjacent evaporators from the second-effect evaporator to the n-effect evaporator to enable the pickling solution to sequentially flow through the brine pump and the seawater booster pump and then sprayed into the second-effect evaporator to the n-effect evaporator through seawater spraying pipelines, and the pickling solution is in contact with the outer walls of heat exchange pipes in the second-effect evaporator to the n-effect evaporator. According to the cleaning method of the seawater desalination device, water scales on the heat exchange pipe on the brine side of the evaporators in the seawater desalination device, heat exchange pipe plates and the inner walls of the evaporators can be effectively removed, a good cleaning effect is achieved, and the seawater desalination water production ratio is greatly increased.

Description

technical field [0001] The present application relates to the technical field of seawater desalination, and more specifically, to a cleaning method for a seawater desalination device. Background technique [0002] Low-temperature multiple-effect distillation (LT-MED) seawater desalination technology refers to the desalination technology in which the maximum evaporation temperature of brine is lower than 70°C under vacuum conditions. It is characterized by connecting a series of horizontal tube spray falling film evaporators in series. With a certain amount of steam input through multiple evaporation and condensation, the evaporation temperature of the latter effect is lower than that of the previous effect, thus obtaining a desalination process of distilled water that is multiple times the amount of steam [1]. Compared with multi-stage flash distillation seawater desalination technology, the operating temperature is lower, which slows down the scaling tendency to a certain e...

AI Technical Summary

Problems solved by technology

[0007] The invention discloses a cleaning method for a seawater desalination device, in order to solve the technical problem of difficult cleaning of the scale on the heat exchange tube, the heat exchange tube plate and the inner wall of the evaporator in the prior art on the brine side of the evaporator in the seawater desalination device

Images