Author: anderthalbAdmin

Supplemental Oxygen for All-Volatile Treatment under Oxidizing Conditions

Jeremy B. Smith and D. Matt Craven

With aging fleets of fossil- and gas-fired units throughout the industry, flow-accelerated corrosion failures remain a major concern. Southern Company’s water chemistry program strives to provide its fossil and gas fleet with the best innovative solutions to control water/steam cycle chemistry within the latest industry guidance. This paper explains the Southern Company Water Chemistry group’s approach to achieving and maintaining the best control over the condensate and feedwater dissolved oxygen concentration for allvolatile treatment under oxidizing conditions (AVT(O)) chemistry programs.

PPCHEM® 2024, 26(6), 288–297

Water Treatment of Flue Gas Condensate – White Paper

Nordic IAPWS

Flue gas condensation is the cooling of flue gas below its dew point. It produces heat from the condensation of the water content of the flue gas and it produces flue gas (FG) condensate. The FG condensate must be treated for discharge or reuse, hence the term FG condensate treatment.

FG condensate treatment is a specialty of the Nordic countries, where it has been developed since the mid-1980s. Today, the technique is well established and widespread in this region. This white paper summarizes the experiences gained in the Nordic countries to provide best practices to current and new users and build a bridgehead for other countries that may use the technology in combined heat and power production.

PPCHEM® 2024, 26(6), 308–331

Review of the vgbe Chemistry Conference 2024, 22–24 October in Potsdam

This year, the traditional vgbe Chemistry Conference celebrated its 60th anniversary. From October 22 to 24, 2024, approximately 160 participants from Germany and abroad gathered in Potsdam to discuss and learn about the latest trends and challenges in power plant chemistry.

The vgbe Chemistry Conference team expresses its gratitude to all participants, speakers, and exhibitors for their contributions, which made this event a success. The team is already looking forward to the next vgbe Chemistry Conference, scheduled to take place in Kassel from October 28 to 30, 2025.

PPCHEM® 2024, 26(6), 334–335

Tribute to Prof. Wolfgang Wagner

The German-Swiss Association for the Properties of Water and Steam e.V.

This issue includes a tribute to a highly respected member of the International Association for the Properties of Water and Steam (IAPWS) community who recently passed away. Professor Wolfgang Wagner’s dedication, warmth, and significant contributions have left a lasting legacy within our field. He was a pioneer in improving data correlation techniques for the thermodynamic properties of water and steam. Under his leadership, IAPWS developed the current international formulations for the thermodynamic properties of water and steam. His presence will be deeply missed, and we honor him for his invaluable impact on our community. This tribute is from the joint national committee of Germany and Switzerland, of which he was an honorary member.

PPCHEM® 2024, 26(5), 224–225

Inferred Boiler pH from Conductivities in Solutions Containing Sodium Phosphate, Alkalizing Amines, and Amine Decomposition Products

Daniel Zinemanas and Eyal Keren

Accurate knowledge of the pH in boiler water is an important and central chemical parameter for the monitoring and control of the boiler chemical conditions and is critical to minimizing the corrosion processes. pH measurements, however, are not always easily or accurately measured, so alternative means of correctly estimating the boiler pH can be useful for achieving these goals. In certain situations, the conditions are even quite complex and challenging since the impurities which negatively affect the chemical parameters arise from the treatment chemicals themselves, such as, for example, the products of the thermal decomposition of organic alkalizing amines used for pH control. Thus, it is the purpose of the present study to show an alternative way by means of the calculation of the inferred pH from the specific conductivity and the conductivity after cation exchange and to describe its application, together with these conductivities, to the monitoring and control of the boiler water in relatively complex solutions in which sodium phosphates, alkalizing amines, and amine decomposition products are present. The methodology described in the paper is applied in a cogeneration plant with a dual pressure heat recovery steam generator equipped with an air-cooled condenser, where, as demonstrated, very good results were achieved. The study also emphasizes the main concerns and disadvantages regarding the use of organic alkalizing amines in water/steam cycle water treatment.

PPCHEM® 2024, 26(5), 226–237

IAPWS TGD2-09(2024): Instrumentation for Monitoring and Control of Cycle Chemistry for the Steam/Water Circuits of Fossil-Fired, Combined Cycle, and Industrial Power Plants

The International Association for the Properties of Water and Steam

This Technical Guidance Document was first issued in 2009 and revised in 2012 and 2015. This 2024 revision includes a small number of updates and clarifications. These do not constitute significant changes to the scope of the document or to the guidance contained.

In order to achieve suitable chemical conditions in steam/water circuits, it is essential to establish reliable monitoring of key parameters on every plant. This enables the demonstration of operation within cycle chemistry targets, and alerts the operators to the need to take corrective action when the target conditions are compromised.

This technical guidance document considers conventional fossil, combined cycle / HRSG, and industrial plants and identifies the key instrumentation and monitoring techniques required for each plant type and cycle chemistry treatment. It is emphasized that this is an IAPWS guidance document and that, depending on local requirements, the use of simpler instrumentation may be adequate, whereas more complex techniques and instrumentation may be necessary when specific issues arise.

PPCHEM® 2024, 26(5), 250–275