Last updated: 06.12.2018

Contents Issue 03 (2018)

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Experience with the Application of a Film Forming Amine in the Connah's Quay Triple Stage Combined Cycle Gas Turbine Power Plant Operating in Cycling Mode
Wolfgang Hater, Bill Smith, Paul McCann, and André de Bache

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Due to the changing conditions of the energy market, many power plants have various periods of non-operation, ranging from a few days to months. Unprotected unit shutdown represents a serious corrosion risk and thus a risk for the integrity of key plant parts, such as the boiler or steam turbine. However, the established conservation methods of the water-steam cycle are not always applicable under the constraints of the modern power market, with unpredictable shutdown periods, while at the same time the plants have to remain available and may be required to run at short notice. Film forming amines (FFAs) offer excellent potential for the required flexible conservation process. The Uniper combined cycle gas turbine power plant located at Connah's Quay, UK, has assessed the applicability of FFAs for boiler and steam turbine protection.

Besides a product based on a combination of FFAs with alkalising amines, a newly developed product containing solely the FFA was applied. Some key benefits could be demonstrated. The protection of the boiler and steam turbine could be achieved for a period of at least one month. The technology was able to protect all components of the watersteam cycle, including the areas of predominantly dry steam. Compared to dehumidification or nitrogen capping, minimal manpower was required for conservation. By the application of the newly developed product, the drawback of increased cationic conductivity levels was overcome, which remained close to the normal operation values. Due to the encouraging results, FFAs are now applied in all 4 units of the Connah's Quay power plant.

PowerPlant Chemistry 2018, 20(3), 136–144
Interpretation of Stator Cooling Water Chemistry Data
Robert Svoboda

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Key parameters for chemistry monitoring of stator cooling water are conductivity, electrochemical potential (ECP), pH, and the concentrations of oxygen, copper, and of possible chemical additives (like NaOH for alkaline treatment). While conductivity, oxygen, and ECP merit continuous supervision, periodic analysis (e.g. once a month) may be sufficient for the other parameters.

The relation between the copper concentration and conductivity permits an assessment of the susceptibility of the system with regard to deposition and corrosion, as well as of possible impurity ingress. For alkaline treatment, measurement of conductivity and the sodium concentration indicates whether the alkalization is running properly. Oxygen concentration is a valuable indicator, but is ambiguous with low-oxygen regimes. Here, oxygen ingress may be detected by an elevated oxygen concentration in the water. However it is also possible that the oxygen is being consumed so rapidly that it does not show up in the water analysis.

PowerPlant Chemistry 2018, 20(3), 154–162
Use of Microfluidic Capillary Electrophoresis to Measure Chloride and Sulfate at µg · kg–1 Levels
Akash Trivedi

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This paper describes a new approach to on-line monitoring of trace levels of chloride and sulfate based on microfluidic capillary electrophoresis (MCE). In this new analytical system, replenishment of the sample and reagent in the MCE cartridge has been automated to provide fully unattended operation. This system provides very high sensitivity (at the single µg · kg–1 level) for simultaneous determination of chloride and sulfate, comparable to that of ion chromatography. The instrument has been successfully deployed in a power plant application.

PowerPlant Chemistry 2018, 20(3), 164–167
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