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Study on the anodic protection by means of current dispersion in a stainless steel acid distributor and a downcomer pipe

WANG Zhenhua;LI Wenhao;ZUO Rui;ZHENG Jianguo;Tianhua Research and Design Institute of Chemical Machinery & Automation Co.,Ltd.;  
The impact of the diameter of a downcomer pipe,flow rate,the temperature of a concentrated sulphuric acid,and the potential of anodic protection on the current dispersion in a downcomer pipe was investigated via a simulated anodic protection experiment in a stainless steel acid distributor and a downcomer pipe. The findings showed that the larger the diameter of a downcomer pipe,the weaker the shield of the anodic protection current; the smaller the pipe diameter,the stronger the shield of current.The increase of the concentrated sulphuric acid flow rate does not favor the current dispersion and the anodic protection.The increase in the temperature of the concentrated sulphuric acid enhances the attenuation of the anodic protection potential in the downcomer pipe.Thus,the increase in the anodic protection potential favors the protection of the downcomer.
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