Anode protection anticorrosion method for acid separating device

Abstract

The present invention relates to electrochemical corrosion preventing anode protecting technology and is used especially for acid separator in acid producting equipment. The anode protecting device includes acid separating pipes, cathode, reference electrode and constant potential instrument and features that the acid separating pipes as the anode are connected via wires to the positive electrode and zero potential of the constant potential instrument, the cathodes of the acid separating pipes in the acid separator are connected to the negative electrode of the constant potential instrument and the reference electrodes of the acid separating pipes are connected to the reference electrode of the constant-potential instrument. The said method can expand the anode protecting area to 2.5 m over area to protect the inner surfaces of the acid separating branches.

Description

Technical field: [0001] The invention mainly relates to an electrochemical anti-corrosion anode protection technology, in particular to an electrochemical anti-corrosion anode protection technology for an acid division device in acid production equipment. Background technique: [0002] The acid separation device used in the drying tower and absorption tower of the prior art for producing sulfuric acid generally adopts the groove type acid separation device in its structure, and the material adopts ball mill cast iron, low chromium cast iron and other alloy materials. Due to the corrosion of sulfuric acid in the tank, the acid distributor depends on the consumption of wall thickness to ensure its use, and the impurities in the tank often block the acid branch pipe. The acid separation device is heavy and has a short service life. During the annual overhaul, considerable parts need to be replaced. The working environment is quite harsh and the maintenance cost is very high. I...

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Problems solved by technology

Because the sulfuric acid in the acid separation device used in the drying tower and absorption tower for the production of sulfuric acid should be evenly distributed on the circular surface in the tower, it is required that the acid separation device be equipped with several acid branch pipes and acid drop pipes, the flow rate of concentrated acid in the pipe is high and There are many changes in the flow direction, coupled with the small cross-section and many accessories of the acid distribution pipeline, the traditional anodic protection technology cannot protect the acid branch pipe and the acid drop pipe from sulfuric acid corrosion through the cathodic protection on the acid distribution main pipe, which brings a negative impact on the implementation of anodic protection. come with some difficulty

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