Pickling method and pickling device of low-temperature multi-effect sea water desalting equipment

Abstract

The invention relates to a pickling method and a pickling device of low-temperature multi-effect sea water desalting equipment. The pickling method comprises the steps of rinsing with fresh water, pickling and rinsing with the fresh water again. A medium in the pickling step comprises 3-10% of sulfamic acid, 0.2-0.8% of corrosion inhibitor and a proper amount of defoaming agent and fresh water; the pickling temperature is 50-60 DEG C; and the sprinkle density of the pickling medium outside a heat exchange tube to be pickled is 0.03-0.05kg / (m2*s), and the pickling time is 6-8 hours. The pickling device utilizes a brine discharge pump of a traditional system as a pickling circulation pump, simplifies a pickling system, adopts the combined acidification equipment of a movable type pickling tank and is convenient for the pickling operation; and the pickling method adds a pickling inspection step after pickling, ensures the pickling effect, forms a favorable passivating film outside the pickled aluminium brass heat exchange tube by a passivation step, enhances the corrosion resistance of the heat exchange tube resisting sea water and strong brine and prolongs the service life of the heat exchange tube.

Description

technical field [0001] The invention relates to a pickling method and a pickling device, in particular to a pickling method and a pickling device for low-temperature multi-effect seawater desalination equipment. Background technique [0002] Aluminum brass tubes (HAL77-2) are mostly used as heat exchange materials for low-temperature multi-effect seawater desalination equipment, and the heat exchange tubes in general evaporators are arranged horizontally. During the evaporation process, steam flows in the heat exchange tubes, and seawater flows in falling film outside the tubes. During the operation of low-temperature multi-effect seawater desalination equipment, if scaling occurs, the heat exchange efficiency will be reduced and energy waste will be generated. It is necessary to perform chemical cleaning in time to restore the cleanliness of the heat exchange tube surface. [0003] At present, there are only guidelines for chemical cleaning of condensers in power plants in...

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