Contents Issue 7 (2011)

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English Abstracts

Steven L. Barnes
Whole Plant Layup Experience

The paper presents an experience report on the long-term dry layup of an entire coal-fired power plant. The planning phase is described, including the issues that needed to be addressed and the advantages and disadvantages of the procedures that were considered. The layup process is described and data on the results of the drying procedure are presented.

PowerPlant Chemistry 2011, 13 (7)
Christopher M. B. Lehmann and David A. Gay
Monitoring Long-Term Trends of Acidic Wet Deposition in US Precipitation: Results from the National Atmospheric Deposition Program

The National Atmospheric Deposition Program has measured long-term trends in acidic wet deposition since 1978. Over the past thirty-plus years, most of the continental United States has experienced significant trends in ion species affecting acidic deposition. Some of these trends appear directly attributable to the 1990 Clean Air Act Amendments.

PowerPlant Chemistry 2011, 13 (7)
Gayathri D. Ariaratnam and Nick J. Roth
Particle Characterization and Counting at High Temperature and Pressure

This paper describes an online particle measurement system that provides high resolution size distributions and differentiates between different particle types at high temperatures and pressures in real time. Case studies are presented which show how the data provided on water, solids, oil and gas concentrations and sizes can be invaluable to optimizing the performance of a process.

PowerPlant Chemistry 2011, 13 (7)
Stephen J. Shulder and Steve Biagiotti
Buried Piping Integrity Management at Fossil Power Plants

In the last decade several industries (oil & gas pipelines, nuclear power, and municipal water) have experienced an increase in the frequency and public scrutiny of leaks and failures associated with buried piping and tank assets. In several industries, regulatory pressure has resulted in the mandated need for databases and inspection programs to document and ensure the continued integrity of these assets. Power plants are being extended beyond their design life and the condition of below grade assets is essential toward continued operation. This article shares the latest advances in managing design, operation, process, inspection, and historical data for power plant piping. Applications have also been developed to help with risk prioritization, inspection method selection, managing cathodic protection data for external corrosion control, and a wide variety of other information. This data can be managed in a GIS environment allowing two and three dimensional (2D and 3D) access to the database information.

PowerPlant Chemistry 2011, 13 (7)
K. Anthony Selby
Cooling System Microbiological Control and Monitoring

Cooling water systems in electric utility plants face challenges related to corrosion, mineral scale deposition, microbiological fouling, and suspended solids accumulation. Of these challenges, microbiological control is a primary issue because it can impact the others. In addition to a direct impact on heat transfer, microbiological growth can influence corrosion, trigger mineral scale formation, and accelerate suspended solids accumulation.
This overview discusses the common methods of microbiological control in power plants as well as some emerging technologies. It also emphasizes the importance of monitoring the effectiveness of microbiological control and discusses current monitoring methodology.
This paper is limited to "open" cooling systems. These are defined as those circulating water through a cooling tower or operating in a once-through fashion on a lake or river. Closed cooling, closed heating, or bearing cooling water systems are not included.

PowerPlant Chemistry 2011, 13 (7)
Terry Heller and Claude Gauthier
The Benefits of Specialty Macroporous Resins in Nuclear Power Plant Operations

Nuclear power plant operations benefit significantly from the use of specialty macroporous ion exchange resins. Greater dose is being retained on cleanup beds during outage activity and lower activity is remaining in systems and being released to radwaste treatment. Information on the macroporous cation Purolite? NRW160 loading and selectivity over gel resins with emphasis on cobalt, cesium, and other metals is reviewed. The performance of the macroporous anion NRW5010 as related to particulate removal such as iron, cobalt, and isotopes forming iron complexes is also discussed. Additionally, a new next-generation macroporous anion NRW5070 is introduced along with new applications.

PowerPlant Chemistry 2011, 13 (7)
Albert Bursik
The Sodium Level – An Inconspicuous but Very Important Parameter in All-Volatile Treatment

Boiler tube failure due to "lack of sodium"? This is certainly not a common concern, yet this contribution stresses the importance of the presence of sodium in the boiler water even when applying all-volatile treatment (AVT) as a method of boiler water treatment. Sodium in the cycle (either unintentionally via sodium-contaminated makeup or intentionally through sodium hydroxide additions) may neutralize the possible acidic contaminations and help to avoid boiler tube failures due to hydrogen damage.

PowerPlant Chemistry 2011, 13 (7)
Pavel Hübner
Organics Removal in Water Treatment Plants

Organics present in the feedwater may have adverse effects on boilers and turbines. This contribution looks at the sources of organics in the feedwater and how the organics levels can be reduced to safe values. The various water treatment technologies are differently effective in removing the various organics fractions, thus depending on the raw water used, different combinations of technologies may be necessary to achieve desired conductivity and total organic carbon levels.

PowerPlant Chemistry 2011, 13 (7)
Robert Svoboda
Meeting of the IAPWS Working Group 'Power Cycle Chemistry' in Pilsen (Czech Republic), September 4–8, 2011

The PCC Working Group meeting will comprise a review of the Priority List, which identifies in which areas a need for basic research is seen by the Working Group members, as well as an update of ICRNs and International Collaboration. Task Groups will pursue items of special importance, such as the creation of guidance documents. The meeting will also include workshops and symposia. The complete and up-to-date agenda can be viewed at the IAPWS website (www.iapws.org). With this notice, interested engineers are invited to attend the meeting, either as a guest or, in case of long-term interest, as a prospective member. The Working Group would appreciate discussion and input, and can reward participants with interesting and pleasant international teamwork.

PowerPlant Chemistry 2011, 13 (7)
  
  
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