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Adsorption of Static-Dynamic Crystallization Based on Conductivity Detection

Author: CaoYingJun
Tutor: CaoShengXian
School: Tohoku Electric Power University
Course: Systems Engineering
Keywords: Solid - liquid interface adsorption The degree of supersaturation Conductivity Titration
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 0
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Abstract


The important part of the industrial cooling water as industrial water, with about 70% of total industrial water, due to the severe shortage of fresh water resources, industrial cooling water generally recycling. Recycled water quality constantly evaporation, weathering and impurities carry, resulting in circulating cooling water systems often concentrated crystals, the most common of which is calcium carbonate scale, affecting the safe and economic operation of the circulating cooling water system. To solve this problem, starting from crystal adsorption theory, explore the adsorption mechanism of calcium carbonate crystals by static and dynamic experiments with conductivity monitoring methods provide a theoretical reference for the anti-scaling, scale and descaling countermeasures. Of the subject in the analysis the the crystal adsorption existing theory on the basis of the results, the proposed theoretical model based on the conductometric titration crystal adsorption amount through static and dynamic experiments verify the feasibility of the method. First, in order to meet the demand of the static experiment, the subjects in the research group has developed on the basis of the scale inhibitor performance assessment instrument based conductometric titration, its further development and improvement, including: optimized input frequency conductivity electrode design temperature conditioning circuit and a temperature measurement range, improved titration droplets given control, titration and measurement accuracy, improved electrode pollution control measures to improve the stability of the instrument and to further improve measurement accuracy. Secondly, in the analysis of the titration process the conductivity signal characteristics based on carbonate consumed by the reaction based on the formation of calcium carbonate and calcium concentration, based on the monolayer adsorption mechanism, starting from the law of mass action, and establish a the conductometric titration solid - liquid interface adsorption kinetics equation. Finally, too different CaCO3 saturation solution in carbon steel surface adsorption process experimental study of the static and dynamic. Static experiments, the use of sodium carbonate titration, calcium chloride, and conductivity-controlling CaCO3 solution supersaturation degree of carbon steel surface at different CaCO3 over adsorption phenomena in the saturation solution, according to the ionic conductivity by the detection process of titration relationship as well as the solid - liquid interface adsorption kinetics equation to calculate the amount of carbon steel adsorption. The results show that the different CaCO3 over-saturation of the solution in the carbon steel surface adsorption processes follow the solid - liquid interface adsorption kinetics equation of law, in line with the monolayer adsorption mechanism. Crystal adsorption process for an in-depth understanding of calcium carbonate scale, to prove the reliability of the method, this topic dynamic experiments, experimental results show that the calcium carbonate in the adsorption amount of heat transfer surface fouling resistance changes consistent.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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