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| Natural Draft Towers |
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Natural Draft Cooling Tower Ring Replacement: Unique Construction Challenges and Solutions |
Gregory S. Mailen and Darin Baugher, EvapTech, Inc. Rory C. McCormick, PPL Generation |
2012 |
| Abstract: This paper presents the technical, logistical and scheduling challenges encountered to complete the project during a 49 day outage, which included preassembly of sixty-four (64), 15-ton pultruded structural fiberglass modules. More than 150 workers logged 94,000 man hours with zero safety incidents, (2) days ahead of schedule, allowing early plant restart and commissioning. The completed tower provides PPL additional generation capacity while distributing 261,000 gpm, is 45 feet high and 400 feet in diameter. |
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Breakthrough Cooling Tower Shell For FGD Discharge Piping |
Vladislav Grebik, REKO PRAH, A.s. |
2011 |
| Abstract: FGD (Flue gas desulfurization) discharge piping goes in the centre of natural draught cooling tower. For this huge pipe, diameter approx 10,0 m, big hole in the concrete shell is necessary. Technical treatment is different for existing cooling tower and a new building shell. |
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Structural Modeling and Analysis of Natural-Draft Cooling Towers |
Leandro Etcheverry and Prasad Samarajiva, Walter P. Moore |
2009 |
| Abstract: Advance finite element modeling and analysis can be useful to determine wind load capacity of natural-draft cooling towers. Because of the aggressive process and environmental exposure conditions, natural-draft cooling can sustain significant deterioration. This deterioration can be quantified and qualified by conducting a condition assessment. The findings from the assessment can be incorporated into the finite element model to determine wind load capacity not only of the as-designed structure but of the structure in its existing condition as well. The modeling and analysis is complex due to the geometry of the veil and the associated wind loads. As part of the analysis, wind loads are increased until the established failure criteria (stress or deflection) is reached. The results of the wind load analysis can be useful to plant owners in assessing the risks associated with the existing condition of the natural-draft cooling tower structure. |
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Upgrading and Repacking Two 460 MW Natural Draft Cooling Towers |
Peter Bosman, Knight Piesold Energy LLC, Dave Stables, Knight Piesold (PTY) LTD |
1998 |
| Abstract: This paper discusses the upgrading and repacking of two ND cooling towers at Hwange Power Station in Zimbabwe. The work involved replacing the badly blocked asbestos cement film pack with a high performance stainless steel splash/trickle pack while maintaining both towers in operation. The repack not only restored tower performance, recooled temperature was approximately 18°F worse than original design, but also improved recooled temperature by a further 3.6°F. |
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On-Line Performance Monitoring of the Natural Draft Cooling Tower at Cardinal Plant |
Frank L. Michell, Mathew J. Miller, American Electric Power |
1998 |
| Abstract: The paper will provide an over view of the online performance monitoring system recently installed on the 630 MW coal fired Unit 3 at Cardinal Plant in Brilliant, Ohio. Experience with using the on-line monitor to optimize performance of the major circulating water system components including the pumps, condensers and cooling tower will be evaluated and presented in the paper. |
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Oriented Spray-Assisted Cooling Tower |
Charles F. Bowman, Chuck Bowman Assc., Inc. Dudley J. Benton, Ph.D., Environmental Consulting Engineers, Inc. |
1996 |
| Abstract: Although the thermal performances of natural draft cooling towers occasionally fail to meet expectations, the options available to the designer to improve the performance of these cooling towers are limited. This paper presents the technical basis for a new Oriented Spray-assisted Cooling Tower design developed by the authors while employed by the Tennessee Valley Authority (TVA). This design which may be back-fitted to existing natural draft cooling towers reduces the water loading and increases the air flow, resulting in a significant improvement in overall thermal performance. The paper will present the results of case studies conducted for existing TVA natural draft cooling towers and will show how the improvement in performance is achieved. |
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Thermal Performance Evaluation of The Natural Draft Cooling Tower (TP-83A) |
John C. Campbell, Ceramic Cooling Tower Company |
1970 |
| Abstract: |
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Natural Draft Cooling Towers (TP-38A) |
W.J. Jones, Hamon-Cottrell, Inc. |
1968 |
| Abstract: |
