Experimental Study on Electrochemical Softening for Cooling Circulating Water in Converter Station

Xia Zhu,Zhengkun Li,Sufei Liu,Shuai Du,Zhenhua Ren,Xiaoyu Liu,Juan Wang,Ying Tian,Can Wang,M.M.H Mostafa,S Manickam

doi:10.1051/e3sconf/202126102037

Abstract

In this study, the electrochemical softening method was used to treat the simulated drainage of the converter station, and the treatment effect under different water inlet conditions was investigated. The results show that the hardness removal rate is from 10% to 80% when the residence time is from 0.5h to 4h, and the longer the residence time is, the higher the removal rate is. The maximum scale removal capacity reached 2.67g/h/m2 when residence time was 1h. Through the formula fitting of several groups of tests, it is concluded that the removal effect can be expressed by the formula C0/C=0.9627e(17.73at/V) under different water intake (residence time).

Highlights

Five groups of experiments were carried out according to the table, and the results of hardness removal rate were shown in the figure: Figure 2
It can be concluded that: 1. When the residence time is from 0.5h to 4h, the hardness removal rate is from 10% to 80%, and the longer the residence time is, the higher the removal rate is
The maximum amount of scale removal reaches 2.67g/h/m2 at residence time 1h, so it can be considered that the water velocity between plates has a great influence on the hardness removal effect

Summary

The experiment part

2.1 The experimental system The system flow chart is shown, including water inlet tank, electrolysis device and water inlet pump. The water sample is driven into the descaling equipment from the water inlet pump. There is an overflow port at the top of the descaling equipment. The water in the equipment is full and directly overflows out of the equipment. The internal size of descaling equipment is 400* 430* 370 mm, and the water volume is 60L; The anode plate is made of ruthenium-iridium coated titanium substrate plate with a network structure and a surface area of 0.95m2. The cathode plate is carbon steel, and the entire inner wall of the equipment is used as the cathode. The total area of the cathode is 1.59m2. The experiment uses DC power supply, the specification is 24V, 40A

Preparation of water samples

Power Settings

Laboratory testing

Conclusions and Suggestions