Research on Scale Inhibition of Green Scale Inhibitors Used in the Industrial Recycling Cooling System with Reclaimed Wastewater

2013 ◽  
Vol 864-867 ◽  
pp. 1767-1771
Author(s):  
Guan Hua Yue ◽  
Man Zhang ◽  
Ying Han Yu
Keyword(s):  
Cooling System ◽  
Cooling Water ◽  
Domestic Sewage ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Reclaimed Wastewater ◽  
High Scale ◽  
Scale Inhibition ◽  
Thermoelectric Plant ◽  
Green Scale Inhibitors

The reclaimed water of domestic sewage reused in recycling cooling system has been widely spread and applied. Chemical scale inhibitors are the most economic and effective measures to prevent condensers and circulating pipes from scaling currently. Green scale inhibitor are highly regarded for their non-toxicity, phosphate-free, reproducibility and biodegradability. The paper selects two kinds of new green scale inhibitors used in the recycling cooling water of Beijing Thermoelectric Plant. By the measuring the scale inhibition rate, scaling amount, turbidity and SEM, it shows that Polyepoxysuccinic acid (PESA) is worth spreading and applying in the industrial recycling cooling system with reclaimed wastewater, for its high scale inhibition rate, good dispersion, low consumption, high economy and practicability.

Green Composite Scale Inhibitor in Central Air Conditioning Cooling Water

2015 ◽  
Vol 730 ◽  
pp. 183-186
Author(s):  
Mao Dong Li ◽  
Xian Di Zuo ◽  
Bo Yang ◽  
Jun Ming Zhao ◽  
Ying Tong Chen ◽  
...  
Keyword(s):  
Glutamic Acid ◽  
Air Conditioning ◽  
Cooling Water ◽  
Metal Corrosion ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Green Composite ◽  
Circulating Water ◽  
Scale Inhibition ◽  
Central Air Conditioning

With the improvement of living standards, air conditioning becomes the requisite of people’s life; the central air conditioning has become each big building of major appliances[1]. In the whole air conditioning cooling water treatment system, such as scale and sludge which is formed by the metal corrosion phenomenon, will seriously affect the use efficiency of air conditioning. One of the effective solution is adding scale inhibitor to the circulating water. Calcium carbonate deposition method is used to evaluate the scale inhibition rate of PASP, PESA and poly glutamic acid. then evaluate the scale inhibition rate of two compound formula. Results show that PESA with the best scale inhibitor performance, on the basis of its, respectively, compound with PASP and poly glutamic acid. The compound repice can improve the efficiency of scale inhibition. The optimized prescription is that, the PASP is 4mg/L, the PESA is 6mg/L, at this time of scale inhibition efficiency can reach 93.43%.

Application and Research on Corrosion and Scale Inhibitor WJF-6 in Seawater Circulation Cooling Water

2011 ◽  
Vol 189-193 ◽  
pp. 3288-3291 ◽  
Author(s):  
Yong Zhang Zhou ◽  
Chun Yan Yang ◽  
Xin Ni ◽  
Dong Sheng Chen
Keyword(s):  
Linear Polarization ◽  
Cooling Water ◽  
Electrode Reaction ◽  
National Standard ◽  
Anodic Process ◽  
Corrosion Mechanism ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Scale Inhibition ◽  
Simulated Seawater

The inhibition effect of corrosion and scale inhibitor WJF-6 on Q235 steel in simulated seawater circulation cooling water was studied by rotary coupon corrosion tests. And corrosion mechanism of this inhibitor was researched by some electrochemical measurements such as polarized curves and linear polarization, scale inhibition performance of this inhibitor was studied by static anti-scale method. At the same time, the corrosion and scaling influence of concentrated 1,2,3times for corrosion and scale inhibitor WJF-6, used in simulated seawater circulation cooling water, was researched. The results showed that the corrosion inhibitor efficiency reached 91.8% with 75mg/L of the inhibitor with linear velocity of 0.3m/s, and rotation of 72h at 50°C when concentrated multiple was three times. The results of linear polarization showed polarized resistance greatly increase by adding 75mg/L of this kind of inhibitor, its inhibition rate achieved 81.3%. The results of polarized curve revealed the strong polarized area of polarized curve have left shift and anodic polarized curves of electrode reaction was increased in strong polarized area, the basic function of corrosion and scale inhibitor WJF-6 is that the anodic process of electrode reaction were restrained. The effect of concentration multiple on corrosion and scale inhibitor WJF-6 in simulated seawater circulation cooling water showed that the corrosion rate was less than 0.125mm/a of the national standard and when concentrated multiple of simulated seawater circulation cooling water exceeded three times, and scale inhibition rate was more than 90%.

Corrosion and Scale Inhibition Properties by Phosphate-free and Nitrogen-free Scale Inhibitor in Cooling Water System

2014 ◽  
Vol 51 (3) ◽  
pp. 248-256 ◽  
Author(s):  
Huchuan Wang ◽  
Yuming Zhou ◽  
Guangqing Liu ◽  
Jingyi Huang ◽  
Qingzhao Yao ◽  
...  
Keyword(s):  
Water System ◽  
Cooling Water ◽  
Scale Inhibitor ◽  
Cooling Water System ◽  
Scale Inhibition

Effect Evaluation of Inhibitor to Barium Sulfate and Strontium Sulfate

2011 ◽  
Vol 402 ◽  
pp. 41-45
Author(s):  
Chuang Qian Chen ◽  
Kan She Li ◽  
Jie Kang ◽  
Chun Xia Yu ◽  
Jing Liu
Keyword(s):  
Barium Sulfate ◽  
Comprehensive Evaluation ◽  
Production Operation ◽  
Inhibition Rate ◽  
Effect Evaluation ◽  
Scale Inhibitor ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Strontium Sulfate ◽  
Better Than

Facing at the situation that a large amount of BaSO4/SrSO4, which seriously impacts on oil production operation scale, has been yielded during oilfield production, three kinds of scale inhibitor (TS-09, TH-60 and PBTCA) were collected from oilfield for comprehensive evaluation. The results show that the three kinds of scale inhibitor have certain scale inhibition effect to BaSO4/SrSO4, and the influence of different water quality is obvious. When TH-60 concentration was 100 mg/L, its inhibition rate to BaSO4 has reached 95%. In comparison, scale inhibition effect of TH-60 to BaSO4/SrSO4 is better than the others. TH-60 is more suitable for Huaqing oilfield than TS-09 and PBTCA, concentrations range in 100-180 mg/L especially.

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.

Study on Scale Inhibition Performance of Modified Polyaspartic Acid

2014 ◽  
Vol 893 ◽  
pp. 7-10 ◽  
Author(s):  
Yu Hua Gao ◽  
Zhen Fa Liu ◽  
Li Hui Zhang ◽  
Yun Juan Wu
Keyword(s):  
Cooling Water ◽  
Water Systems ◽  
Solution Temperature ◽  
Inhibition Rate ◽  
Polyaspartic Acid ◽  
Scale Inhibition ◽  
Dynamic Experiments ◽  
Treatment Experiment ◽  
Good Scale ◽  
Inhibition Performance

Static and dynamic experiments were used to evaluate scale inhibition performance of modified polyaspartic acid (PASP-ASP). The static experiments showed that the PASP-ASP had good scale inhibition performance and the scale inhibition rate exceeded 98% when the PASP-ASP was 2 mg·L-1 and the solution temperature was 40 OC. In the dynamic experiments, almost no scale was formed on the heat transfer surface and the fouling thermal resistance decreases extraordinarily with PASP-ASP treatment experiment compared with the experiment without treatment. The PASP-ASP could be used in industrial cooling water systems.

A Research on Bactericidal Agent of Heterotrophic Bacteria in Cooling Water by Composite of Non-Oxidizing Biocide and Oxidizing Biocide

2014 ◽  
Vol 955-959 ◽  
pp. 1036-1040
Author(s):  
Cai Xia Sun ◽  
Yan Min Chen ◽  
Yu Shan Cheng ◽  
Min Zhang ◽  
Jin Ying Wu ◽  
...  
Keyword(s):  
Heterotrophic Bacteria ◽  
Cooling Water ◽  
Inhibition Rate ◽  
Scale Inhibition ◽  
Method Show ◽  
Bactericidal Agent ◽  
Fonic Acid

A method was developed to control heterotrophic bacteria in cooling water by mixing non-oxidizing (Isothiazolinones）and oxidizing sterilization （Hydantoin）together. The result of disinfection test shows that the agent possesses a higher efficiency. At the same time the method introduced polyepoxysuccinic acid—1-Acrylanmido-2-methylpropanesul fonic acid（PESA-AMPS (10%)) in to the disinfection system. The rotary coupon test and aeration scale inhibition method show that the bactericidal agent also possesses higher anti-corrosion and inhibition rate. The concentration of heterotrophic bacteria can well be controlled below 105cfu/mL when the additional quantity of the agent changes from 100mg/L to 200mg/L.

Synthesis of New Phosphate and the Evaluation as Scale Inhibitor in Oilfield

2019 ◽  
Vol 814 ◽  
pp. 493-498
Author(s):  
Ren Jun Xu ◽  
Hua Lei He ◽  
Jing Wang ◽  
Hai Peng Hui ◽  
Qiao Na Liu
Keyword(s):  
Calcium Carbonate ◽  
Phosphonic Acid ◽  
Synthesis Method ◽  
Normal Growth ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Composite Scale ◽  
Scale Inhibition ◽  
Ph Range ◽  
Inhibition Performance

Compared with inorganic phosphonates, organic phosphonates have better chemical stability in water treatment, and are not easy to hydrolyze in higher temperature and wider pH range. In this paper, a one-step synthesis method of ethylene diamine tetra (methylene phosphonic acid) sodium (EDTMPS) and methylene phosphonic acid (DTPMPA) were studied. A new phosphate scale inhibitor was prepared and its scale inhibition performance was evaluated. The results showed that the scale inhibition rate increased with the increase of the concentration of synthetic products (EDTMPS, DTPMPA). At the same concentration, compared with DTPMPA, EDTMPS has better scale inhibition performance, and the maximum scale inhibition rate can reach 96.85%. The scale inhibition performance of composite scale inhibitor is better than that of single scale inhibitor, and the scale inhibition rate of the synthesized products can reach more than 90% after compounding. And inhibitory mechanism has been proposed: Because phosphonates effectively control the rate of nucleation. In addition, polyphosphonates can chelate Ca2+, Mg2+ plasma to form monocyclic or bicyclic chelates. This will destroy the normal growth process of calcium carbonate and other crystals, thus preventing the formation of calcium carbonate scale.

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.

Preparation and Evaluation of Phosphate Scale Inhibitor for Oilfield Produced Water

2019 ◽  
Vol 814 ◽  
pp. 511-516
Author(s):  
Wei Wang ◽  
Yong Gen Yi ◽  
Zhi Fei Sun ◽  
San Bao Dong ◽  
Wei Chao Du
Keyword(s):  
Produced Water ◽  
Synthesis Method ◽  
Inorganic Salts ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Scale Inhibition ◽  
Single Scale ◽  
One Step ◽  
Inhibition Performance ◽  
Better Than

Phosphorus scale inhibitor is a kind of agent which can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surface, and maintain better heat transfer effect of metal equipment. Sodium triethylenetetramine hexamethylphosphonate (TETHMPS) and tetraethylenepentamine heptagon methylene phosphonic (TEPHMPS) were prepared by one-step synthesis method. The effects of temperature, concentration and mixing ratio on scale inhibition were investigated. The results showed that as the concentration of TETHMPS and TEPHMPS increases, the scale inhibition rate increases. At the same temperature, compared with TETHMPS, TEPHMPS has better scale inhibition performance, and the maximum scale inhibition rate can reach 93.59%. The scale inhibition rate of the synthesized scale inhibitor at 80 °C is better than that at 60 °C. The scale inhibition performance of the compound scale inhibitor is better than that of the single scale inhibitor, showing an ideal synergistic effect. When the concentration is 60 mg/L, the scale inhibition rate of TETHMPS is 94.26%, TEPHMPS is 94.55%, and the scale inhibition rate is above 91%.

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