Abstract
Typical disturbances in the dynamics of a corrective reagent dosing system under unsteady-state conditions during the unsatisfactory operation of a chemical control system with some water chemistry upsets at thermal and nuclear power stations are considered. An experimental setup representing a physical model for the water chemistry control system is described. The two disturbances, which are most frequently encountered in water chemistry control practice, such as a breakdown or shutdown of temperature compensation during pH measurement and an increase in the heat-transfer fluid flow rate, have been modeled in the process of study. The study of the effect produced by the response characteristics of chemical control analyzers on the operation of a reagent dosing system under unsteady-state conditions is important for the operative control of a water chemistry regime state. The effect of temperature compensation during pH measurement on the dynamics of an ammonia-dosing system in the manual and automatic cycle chemistry control modes has been studied. It has been demonstrated that the reading settling time of a pH meter in the manual ammonia- dosing mode grows with a breakdown in temperature compensation and a simultaneous increase in the temperature of a heat-transfer fluid sample. To improve the efficiency of water chemistry control, some systems for the quality control of a heat-transfer fluid by a chemical parameter with the obligatory compensation of a disturbance in its flow rate have been proposed for use. Experimental results will possibly differ from industrial data due to a great length of sampling lines. For this reason, corrective reagent dosing systems must be adapted to the conditions of a certain power-generating unit in the process of their implementation.
Similar content being viewed by others
References
Rules for Technical Maintenance of Electric Power Plants and Networks of the Russian Federation (ORGRES, Moscow, 2003) [in Russian].
O. V. Egoshina, V. N. Voronov, and M. P. Nazarenko, “Modern state of cycle chemistry monitoring systems at thermal power stations according to the experience gained at the Moscow Power Engineering Institute and Element research and production center,” Therm. Eng. 61 (3), 214–220. doi 10.1134/S0040601513070033
O. V. Egoshina, M. P. Nazarenko, A. V. Tret’yakov, and V. N. Kindyakov, “Chemical-engineering monitoring system on Iriklinskaya GRES power plant,” Nov. Ross. Elektroenerg., No. 7, 40–48 (2012) [in Russian].
A. B. Larin and A. V. Kolegov, “Analysis of results obtained using the automatic chemical control of the quality of the water heat carrier in the drum boiler of the Ivanovo CHP-3 power plant,” Therm. Eng. 59 (10), 794–799 (2012).
O. V. Egoshina and M. P. Nazarenko, “Modernization of existing chemistry control systems on thermal power plants,” Nov. Ross. Elektroenerg., No. 11, 40–48 (2013).
RD 153-34.1-37.532.4-2001. Common Technical Requirements for Chemical-Engineering Control Systems of Water-Chemical Regimes on Thermal Power Plants (Energ. Tekhnol., Moscow, 2002) [in Russian].
O. V. Egoshina, V. N. Voronov, and P. N. Nazarenko, “Development of a system to automatically regulate the metering of hydrazine for chemical-engineering monitoring systems,” Therm. Eng. 54 (7), 535–538 (2007).
O. V. Egoshina, V. N. Voronov, N. A. Makarishcheva, Aie Min Latt, and A. S. Rogov, “Experimental investigation of dynamic properties of chemical control analyzers,” Therm. Eng. 62 (5), 370–373 (2015). doi 10.1134/S004060151505002X
M. V. Kulakov, Technological Measurements and Devices for Chemical Industry (Mashinostroenie, Moscow, 1974) [in Russian].
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.N. Voronov, O.V. Yegoshina, N.A. Bolshakova, V.O. Yarovoi, Aie Min Latt, 2016, published in Teploenergetika.
Rights and permissions
About this article
Cite this article
Voronov, V.N., Yegoshina, O.V., Bolshakova, N.A. et al. Effect of water chemistry upsets on the dynamics of corrective reagent dosing systems at thermal power stations. Therm. Eng. 63, 903–907 (2016). https://doi.org/10.1134/S0040601516120090
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0040601516120090