Estimation of Hydrocarbonates’ Effect on Ammonia Concentration and pH in Conditions of Feed-Water Quality Deterioration

• Published in: Thermal engineering Vol. 70; no. 6; pp. 453 - 458
• Main Authors: Yegoshina, O. V., Zvonareva, S. K., Ivanova, A. O.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.06.2023; Springer Nature B.V
• Subjects: Algorithms; Ammonia; Analyzers; Electrical resistivity; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Laboratories; Mathematical analysis; Measuring instruments; Monitoring; Monitoring systems; Quality standards; System effectiveness; Thermal power plants; Water quality; Water Treatment and Water Chemistry; cycle chemistry monitoring; cycle chemistry; thermal power plant; automatic chemical control; power unit; water and steam quality
• ISSN: 0040-6015; 1555-6301
• DOI: 10.1134/S0040601523060034

Violations in water- and steam-quality standards cause emergencies at thermal power plants. In such conditions, chemical monitoring provides reliable and quick information about the normalized parameters of water and steam quality by direct measurement or indirect determination of the quality indicators of the analyzed medium. The expansion of functionality and effective detection of fast-flowing disturbances in cycle-chemistry monitoring systems is possible by predicting and analyzing the behavior of impurities along the path of the power unit. However, a large volume of chemical control performed with the help of laboratory chemical control analyzers reduces the reliability of water- and steam-quality monitoring systems. In the early stages, it is advisable to carry out the occurrence of violations of the quality of water and steam at the expense of automatic devices, including conductometers and pH meters, since such devices are the most reliable in industrial operation. Currently, algorithms for calculating pH and ammonia concentration based on continuous measurements of electrical conductivity continue to be improved. Within the framework of the work, the possibility of using an indirect algorithm based on the measurement of specific electrical conductivity in conditions of deterioration of feed water quality is investigated. The pH and concentration of ammonia were determined on the basis of measurements of specific electrical conductivity with dosing of hydrocarbonates in laboratory conditions. An experiment was performed, as a result of which it was revealed that, in case of water-quality deterioration, the error in calculating pH and ammonia increases.