Search for a Solution to the Problem of Flow-Accelerated Corrosion in Heat-Recovery Steam Generators

Turbulent flow of heavy water through the primary loop of CANDU steam generators is associated with a number of known failure mechanisms such as flow accelerated corrosion, flow induced vibration and mechanical fatigue. The primary causes of these failures, or degradations, are interactions of the turbulence effect of fluid with the surrounding structure. Using Computational Fluid Dynamics and heat transfer techniques the flow fields inside hot leg and cold side of the steam generator were analyzed to study the nature of the flow fields inside the 2 halves of the primary head. The model used to investigate the flow field was a three-dimensional k-omega turbulence flow model. The solutions of the analysis can be used to investigate the effects of flow on components close to the divider plate and tubesheet including locking tabs and skin fix inside the halves. The effect of turbulence was investigated by varying the inlet nozzle sizes and locations.

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Wall Thinning Profile by Flow Accelerated Corrosion in Heat Recovery Steam Generator of Thermal Power Station

The Proceedings of the National Symposium on Power and Energy Systems ◽

10.1299/jsmepes.2019.24.d223 ◽

2019 ◽

Vol 2019.24 (0) ◽

pp. D223

Author(s):

Shun WATANABE ◽

Ryo MORITA ◽

Kazutoshi FUJIWARA

Keyword(s):

Steam Generator ◽

Thermal Power Station ◽

Heat Recovery ◽

Thermal Power ◽

Heat Recovery Steam Generator ◽

Power Station ◽

Accelerated Corrosion ◽

Wall Thinning ◽

Flow Accelerated Corrosion

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Water/Steam Treatment Programs and Chemistry Control for Heat Recovery Steam Generators

Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance ◽

10.1115/power2013-98004 ◽

2013 ◽

Author(s):

Brad Buecker

Keyword(s):

Heat Recovery ◽

Power Plants ◽

High Reliability ◽

Combined Cycle ◽

Steam Treatment ◽

Steam Turbines ◽

Steam Generators ◽

Accelerated Corrosion ◽

Boiler Water ◽

Water Steam

New power generation in the U.S. is being dominated by installation of combined-cycle power plants, where a significant portion of the power is produced from steam turbines supplied by heat recovery steam generators (HRSG). Proper chemistry control and monitoring of HRSG feedwater, boiler water, and steam are essential for high reliability and availability of these units. However, many plants have minimal staff, most if not all of whom have no formal chemistry training and who may not fully understand the importance of water/steam chemistry and monitoring techniques. This paper provides an outline of the most important chemistry control methods and also examines the phenomenon of flow-accelerated corrosion (FAC). FAC is the leading cause of corrosion in HRSGs,[1] and is often the result of the outdated belief that oxygen scavengers are a requirement for feedwater treatment. Since 1986, FAC-induced failures at several coal-fired power plants have killed or injured a number of U.S. utility workers.

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Flow-Accelerated Corrosion Analysis for Heat Recovery Steam Generator in District Heating System

Korean Journal of Materials Research ◽

10.3740/mrsk.2019.29.1.11 ◽

2019 ◽

Vol 29 (1) ◽

pp. 11-15 ◽

Cited By ~ 1

Author(s):

Minki Hong ◽

◽

Hobyung Chae ◽

Youngsu Kim ◽

Min Ji Song ◽

...

Keyword(s):

Steam Generator ◽

Heat Recovery ◽

District Heating ◽

Heating System ◽

Heat Recovery Steam Generator ◽

District Heating System ◽

Accelerated Corrosion ◽

Flow Accelerated Corrosion

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Considerations in the Capacity Uprating of an EOR HRSG

Volume 3: Design and Analysis ◽

10.1115/pvp2016-63015 ◽

2016 ◽

Author(s):

John J. Aumuller ◽

Carlos F. Lange ◽

Michael J. Humphries

Keyword(s):

Steam Generator ◽

Oil Recovery ◽

Heat Recovery ◽

Mechanical Performance ◽

Heat Recovery Steam Generator ◽

Damage Mechanisms ◽

Accelerated Corrosion ◽

Water Steam ◽

Available Energy ◽

Flow Accelerated Corrosion

In enhanced oil recovery operations, the steaming capacity of a heat recovery steam generating unit is limited by the available energy provided from the gas turbine generator, however, there are a number of other component parameters that limit the thermal and mechanical performance of any specific heat recovery steam generator. These additional parameters reside on both the flue gas side and water / steam side of the heat recovery steam generator. Repetitive failures of steam generator components are evidence of damage mechanisms that are active during operation. Some of these damage mechanisms are explored to determine the immediate impact in up-rating the steam generators to higher capacity throughput and also, on longer term reliability. A resulting finding of this study examines the efficacy of using P22 low alloy piping in lieu of carbon steel piping to address flow accelerated corrosion.

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