Pre-filtering device of aluminum heat exchange tube type sea water desalination system and cleaning method

Abstract

The invention discloses a pre-filtering device of an aluminum heat exchange tube type seawater desalination system. The pre-filtering device is arranged at the inlet end of the cold source side of a low-temperature multi-effect seawater desalination system; the pre-filtering device comprises a plurality of pre-filtering units; a plurality of pre-filtering units are arranged in a main pipe split manner, each pre-filtering unit comprises a seawater booster pump, a front-end pressure transmitter, an ion trap, a rear-end pressure transmitter, a filter, a VSD logic control system and a backwashingdevice, and the backwashing device comprises a backwashing buffer tank, a backwashing pump and a backwashing filter. The invention aims to provide the pre-filtering device of the aluminum heat exchange tube type sea water desalination system. The concentration of corrosive metal ions in seawater can be reduced to a negligible degree, the aluminum alloy heat exchange tube is effectively protected from being attacked by the ions to generate dynamic current corrosion, safe and stable operation of the sea water desalination device is guaranteed, and the disassembling and blocking frequency of theheat exchange tube bundle of the effect evaporator is reduced.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to an aluminum heat exchange tube type seawater desalination system pre-filter device and cleaning method. Background technique [0002] The heat exchange process of the low-temperature multi-effect seawater desalination device is mainly evaporation and condensation. The raw seawater or concentrated seawater is evenly distributed in the effect body evaporator through the spray system. The outer surface of the heat exchange tube is distributed in a thin film to realize heat exchange. The seawater absorbs the latent heat of the steam and vaporizes, and the steam on the inner wall of the tube condenses into fresh water, repeating the above process to realize the desalinated water production process. At present, in low-temperature multi-effect seawater desalination devices that mainly use aluminum alloy heat exchange tubes as the main heat exchange medium, except for the t...

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Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to provide a pre-filter device and cleaning method for an aluminum heat exchange tube type seawater desalination system, which solves the problem of the aluminum heat exchange tube type seawater desalination device due to the presence of trace amounts of corrosive Fe in the seawater. 3+ , Mn 2+ Cations and other corrosive metal ions, after contacting the aluminum alloy heat exchange tubes of the seawater desalination device, a displacement reaction occurs, resulting in localized corrosion and perforation of the heat exchange tube bundle, resulting in a reduction in the desalinated water production efficiency of the effect evaporator of the seawater desalination device or even failure of normal production and operation. question

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