Modernization of Automatic Chemical Control of TPP Power Units Based on Conductivity and PH Measurements
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Vol. 54, No. 3, September, 2020
MODERNIZATION OF AUTOMATIC CHEMICAL CONTROL OF TPP POWER UNITS BASED ON CONDUCTIVITY AND PH MEASUREMENTS1 A. B. Larin,2 B. M. Larin,3 M. P. Savinov,4 and S. V. Kiet4 Translated from Élektricheskie Stantsii, No. 4, April 2020, pp. 14 – 22.
Increasing the volume and tightening the quality standards for the water heat carrier of power units require the modernization of the chemical control system at thermal power plants (TPPs). The development of information technologies ensures the creation of automated systems of chemical-technological monitoring (SCTM) and individual devices focused on the application of reliable and inexpensive analyzers such as conductometers and pH meters with data processing using algorithms of any complexity. SCTM of feed and boiler water based on measurements of specific conductivity and pH were developed and tested under industrial conditions. Together with NPP Tekhnopribor (Moscow), a new generation analyzer Leader-APK, similar to the latest generation analyzer AMI Deltacon Power (SWAN Company), was developed. Using the analyzer in the chemical control system of a power unit of combined cycle gas turbine power plants (CCGT) allows reducing the number of automatic control devices by seven units. Keywords: heat carrier quality standards; automatic chemical control of the water regime; modernization of monitoring systems.
search for ways to further improve both the water regime and the methods and means of automatic chemical control of it. Along with the hydrazine-ammonia water-chemical regime (HAWR), the amine-based water-chemical regime (ABWR) is increasingly used [1]. Quality standards for water and steam [1] and analyzers for their control are often based on the cooled samples specific conductivity measurements. Such analyzers are the FAM Deltacon pH and AMI Deltacon Power of SWAN Company. The AMI Deltacon Power analyzer provides indirect measurements of the pH hydrogen indicator and ammonia concentration in the feed water of the power unit by the measured values of the specific conductivity of the direct and H-cationized samples. With an increased measurements volume during automatic chemical control (ACC), which is typical for CCGT power units, and inconsistency of separate indicators, deviations of a number of current values from the standard ones may occur as it is shown in Table 2. The tendency to maintain the ammonia batching up to 1000 ìg/dm3 [1] leads to decreased pH values, and the absence of automatic control and adjustment of phosphate batching leads to a decrease in alkalinity and pH of the boiler water. The analysis of the state of water heat carrier quality estimation was carried out with the participation of the authors and is given in papers [4, 5].
The state and possibilities of modernization of the water heat carrier chemical control. In the absence of uniform rules of technical maintenance (the last edition of the RTM was published more than 15 years ago), it is possible to use the regulations developed in VTI [1] and presented as an o
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