Русская версия English version

Methods of calculating pH and concentrations of feed water ionic impurities at heat power stations by measuring specific water conductivity

A.B. Larin, A.Ya. Sorokina

Vestnik IGEU, 2016 issue 5, pp. 10—15

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Abstract in English: 

Background: Tightening standards for the quality of thermal power plants water coolants and development of automatic chemical monitoring systems for water-chemical regime make it necessary to extend the diagnostic capacity of thermal power plant monitoring systems. Use of the most accurate measurement of coolant quality parameters, such as specific electrical conductivity and pH, increases boiler systems reliability and enables water regime diagnostics. This direction is adopted in power engineering in Western countries. In particular, the Swan firm (Switzerland) has developed and introduced to the Russian energy market its automatic analyzers «FAM Deltacon pH» and «AMI Deltacon Power». The purpose of our research is to develop techniques of indirect measurements and devices of automatic chemical control which are technologically not inferior to the best world samples.

Materials and methods: The developed techniques are the result of in-depth studies conducted in the field of the electrolyte solutions theory, the theory and practice of ionic balance in water solutions by using the innovative stands of the Department of Chemistry and Chemical Technologies in Power Engineering. Similar techniques and stands were for the first time designed at ISPEU and have no analogs in other higher education institutions of Russia.

Results: The study deals with three variants of calculating indirect determination of pH and ammonia concentration based on specific conductivity measurements of refrigerated samples. The calculation techniques are based on specific solutions to the generalized mathematical model of ionic equilibria in conditions of good-quality feed water in boiler installations. The paper represents the results of laboratory research into and industrial testing of the new techniques of indirect determination of water quality standard values at heat power stations. An algorithm has been selected to calculate parameters of industrial systems of automatic chemical control.

Conclusions: The suggested techniques and algorithms have been tested in industrial environments at heat power plants and partly implemented in developing new devices and automatic chemical control systems. The scientific value of the results obtained consists in receiving and justification of the calculation techniques suitable for practical use at heat power plants.

Key words: calculation technique, feed water in steam boilers, рН indicator, mathematical model, specific conductivity, automatic chemical control, heat power plant water-chemical mode, coolant quality standards.

References in English: 

1. Voronov, V.N., Petrova, T.I. Problemy organizatsii vodno-khimicheskikh rezhimov na teplovykh elektrostantsiyakh [Problems of organizing water-chemical modes at thermal power plants]. Teploenergetika, 2002, no. 7, pp. 2–7.

2. Bogachev, A.F., Radin, Yu.A., Gerasimenko, O.B. Osobennosti ekspluatatsii i povrezhdaemost' kotlov-utilizatorov binarnykh parogazovykh ustanovok [Operation and damageability of heat recovery boilers in combined-cycle power plants]. Moscow, Energoatomizdat, 2008, p. 232.

3. Egoshina, O.V., Voronov, V.P., Nazarenko, M.P. Sovremennoe sostoyanie sistem khimiko-tekhnologicheskogo monitoringa na teplovykh stantsiyakh na osnove opyta MEI – OOO NITs «Element» [State-of-the-art of chemical and technological monitoring systems at heat power stations based on the experience of MEI – LLC Research Center Element]. Teploenergetika, 2013, no. 7.

4. Larin, B.M., Bushuev, E.N., Larin, A.B., Batti, M.K.L., Vinogradov, V.N., Kiet, S.V. Raschetnyy metod opredeleniya potentsial'no kislykh veshchestv v pitatel'noy vode pryamotochnykh kotlov [A calculation technique of identifying potentially sour substances in feedwater of non-circulation boilers]. Teploenergetika, 2008, no. 4, pp. 38–41.

5. Larin, B.M., Bushuev, E.N., Tikhomirova, Yu.Yu., Kiet, S.V. Opredelenie kontsentratsii fosfatov v kotlovoy vode putem izmereniya elektroprovodnosti [Determining of phosphates concentration in boiler water through conductivity measurement]. Teplo-energetika, 2008, no. 7, pp. 21–27.

6. Larin, B.M., Larin, A.B., Kolegov, A.V. Izmereniya elektroprovodnosti i рН v sistemakh monitoringa vodnogo rezhima TES [Measurements of conductivity and рН in heat power plant water mode monitoring systems]. Ivanovo, 2014. 332 p.

7. Bushuev, E.N. Matematicheskoe modelirovanie ionnykh ravnovesiy vodnogo teplonositelya s ispol'zovaniem izmereniya elektroprovodnosti i рН [Mathematical modeling of ionic balances of the water heat carrier by measuring conductivity and рН]. Teploenergetika, 2009, no. 7, pp. 13–18.

Ключевые слова на русском языке: 
расчетная методика, питательная вода паровых котлов, показатель рН, математическая модель, удельная электропроводность, автоматический химический контроль, водно-химический режим ТЭС, нормы качества теплоносителя
Ключевые слова на английском языке: 
calculation technique, feed water in steam boilers, рН indicator, mathematical model, specific conductivity, automatic chemical control, heat power plant water-chemical mode, coolant quality standards
The DOI index: 
10.17588/2072-2672.2016.5.010-015
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