scholarly journals Effect of electric field and Mg2+ doping on calcium carbonate scaling shown in experiments and first principle calculations

2020 ◽  
Vol 20 (8) ◽  
pp. 3251-3265
Author(s):  
Yuping Gao ◽  
Judong Zhao ◽  
Erjun Zhao ◽  
Xiaomin Liu ◽  
Yun Jia ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Calcium Carbonate ◽  
Electric Field ◽  
Cooling Water ◽  
Ion Concentration ◽  
First Principle ◽  
Scaling Properties ◽  
First Principle Calculations ◽  
Scale Inhibition ◽  
Circulating Cooling Water

Abstract The effect of an applied electric field and Mg2+ doping on the formation of calcium carbonate scale in circulating cooling water was investigated by using a home-made experimental device, which can simulate the formation of scale in a local power plant. The results show that high-voltage electrostatic fields and magnesium ions can inhibit scale growth in circulating cooling water. When the magnesium ion concentration is 4 mmol/L, the scale inhibition effect is the best under the action of the electric field (6 kV), and its scale inhibition rate can reach 44.56%. Meanwhile, some phenomena are explained and confirmed by the results of first principle calculations. The calculated shear modulus of aragonite is greater than that of calcite. This might explain why aragonite adheres more easily to the heat exchange surface. This is in good agreement with experimental results. Calcite has better anti-scaling properties than aragonite. The crystal structure after physical water treatment is blunt, and the untreated crystal structure is sharp.

The Study and Application on Water Treatment Technology of High-Frequency Electric Field

2013 ◽  
Vol 416-417 ◽  
pp. 1056-1059
Author(s):  
Sen Li ◽  
Hai Feng Wang
Keyword(s):  
Electric Field ◽  
High Frequency ◽  
New Technology ◽  
Cooling Water ◽  
Treatment Technology ◽  
Circulating Water ◽  
Scale Inhibition ◽  
High Frequency Electric Field ◽  
Circulating Cooling Water ◽  
Frequency Electric Field

Nowadays the treatment way of circulating cooling water is mainly confined in the scale removal direction and effect is limited, but in scale inhibition direction few reports. To solve this problem, the study proposed a new technology of high-frequency electric field-colloid-electric adsorption. Simulation circulating water was treated by the self-made electrolytic system in high frequency DC electric field, obtained the optimum conditions by adjusting different electrochemical parameters, and analysed the mechanism of the process. The result suggests that this process has excellent scale inhibition, it reflected the good descaling effect by soften and peel the aging scale, it also can effectively change the crystal morphology, it is convenient, efficient and environment friendly.

scholarly journals Effect of Magnesium Ion Concentration on the Scale Inhibition of Heat Exchanger in Circulating Cooling Water under Alternating Electric Field

2020 ◽  
Vol 10 (16) ◽  
pp. 5491
Author(s):  
Zhihao Zhang ◽  
Yun Jia ◽  
Judong Zhao
Keyword(s):  
Calcium Ion ◽  
Cooling Water ◽  
Ion Concentration ◽  
Magnesium Ion ◽  
Inhibition Rate ◽  
Fouling Resistance ◽  
Scale Inhibition ◽  
Alternating Electric Field ◽  
Circulating Cooling Water ◽  
Calcium Ion Concentration

This work investigated the effect of magnesium ion concentration on the formation of mineral scale in circulating cooling water under alternating electric field treatment (AEFT) by using a self-made power plant circulating cooling water simulator. In this experiment, the circulating cooling water used was artificial hard water. Three experimental groups with different magnesium ion concentrations and three corresponding control groups were studied. Scale inhibition rate, fouling resistance, calcium ion concentration, crystal phase, and crystal morphology were discussed. Results showed that 4 mmol/L magnesium chloride promoted the formation of scale on the copper tube wall, and the average scale inhibition rate was −107.86%. When the magnesium chloride concentration was 6 mmol/L, the situation was reversed, and the average scale inhibition rate reached 59.11%. The changes in calcium ion concentration supported the scale inhibition rate. Scanning electron microscope (SEM) photos showed the change in the composition of calcium carbonate crystals. The results showed that the effect of AEFT on fouling resistance is nonlinearly related to the concentration of magnesium ions in circulating cooling water.

Effect of Ion Migration of Multiple Copper-Zinc Alloy on the Crystal Structure of Calcium Carbonate Scale

2010 ◽  
Vol 96 ◽  
pp. 35-40 ◽  
Author(s):  
Yan Ding ◽  
Jun Ping Meng ◽  
Xu Hong Zhang ◽  
Li Juan Wang ◽  
Qing Guo Tang
Keyword(s):  
Crystal Structure ◽  
Calcium Carbonate ◽  
Zinc Ion ◽  
Ion Concentration ◽  
Zinc Alloy ◽  
Heating Process ◽  
Ion Migration ◽  
Heat Transfer Efficiency ◽  
Copper Zinc ◽  
Calcium Carbonate Scale

Multiple copper-zinc alloy was used to treat water in order to restrict the formation of hard scale during heating process. Trace amounts of metal ions were dissolved from the alloy under the action of tiny battery corrosion, which took part in the crystallization of calcium carbonate crystal. The ion migration rules and its effect on the crystal structure of water scale were studied. The ICP test results show that after immersion in the water for 20 min, the zinc ion concentration increased to 0.35 mg•L-1 compared with contrast group. The simulating experiment of the scale crystal growth demonstrated that the calcium carbonate scale after treated with the alloy showed a transformation from calcite to aragonite, and the ratio of calcite to aragonite changed from 1:0.125 to 1:2.30. Meanwhile, the heat transfer efficiency was increased to 2.19%.

Effects on the calcium carbonate scale in circulating cooling water: constant magnetic and pulsed magnetic fields

2018 ◽  
Vol 124 ◽  
pp. 125-133 ◽  
Author(s):  
Xiao-Lei Wang ◽  
Ju-Dong Zhao ◽  
Zhi-An Liu ◽  
Er-Jun Zhao ◽  
Xing Yang ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Magnetic Fields ◽  
Cooling Water ◽  
Pulsed Magnetic Fields ◽  
Circulating Cooling Water ◽  
Calcium Carbonate Scale

scholarly journals Research on the Influence of Circulating Cooling Water on Electrochemical Scale Inhibition

2020 ◽  
Vol 514 ◽  
pp. 052021
Author(s):  
Man Geng ◽  
Shaotao Zhong ◽  
Guangwu Wang ◽  
Pengfei Cui ◽  
Dingsheng Chen
Keyword(s):  
Cooling Water ◽  
Scale Inhibition ◽  
Circulating Cooling Water

First-principle calculations of crystal structure evolution of electrodeposited iron coating

2012 ◽  
Vol 24 (6) ◽  
pp. 1483-1487
Author(s):  
万小波 Wan Xiaobo ◽  
唐昶环 Tang Changhuan ◽  
杜凯 Du Kai ◽  
张林 Zhang Lin ◽  
王妮 Wang Ni ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Evolution ◽  
First Principle ◽  
First Principle Calculations ◽  
Iron Coating

Preparation and Performance Research of the Environment-Friendly Corrosion and Scale Inhibitor

2014 ◽  
Vol 881-883 ◽  
pp. 604-609 ◽  
Author(s):  
Yan Min Chen ◽  
Cai Xia Sun ◽  
Hui Wu Xu ◽  
Jin Ying Wu ◽  
Chang Shan Huang
Keyword(s):  
Water Treatment ◽  
Cooling Water ◽  
Scale Inhibitor ◽  
Environment Friendly ◽  
Scale Inhibition ◽  
Circulating Cooling Water ◽  
Treatment Agent ◽  
Simulated Test ◽  
And Performance ◽  
Performance Research

A new non-phosphorus composite water treatment agent m (PASP) : m (PESA) : m (HPMA) : m (BTA) = 8:12:10:5 was developed from polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), hydrolyzed polymaleic anhydride (HPMA) and benzotriazole (BTA). The performance of corrosion and scale inhibition were evaluated by rotary hanging-piece, electrochemical and bubble experiments. The corrosion testing piece was characterized by SEM. The results show that the new environment-friendly composite water treatment agent has good performance of corrosion and scale inhibition. Further dynamic simulated test also indicates that the water treatment agent meet the use demand of circulating cooling water.

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