The Effect of Heat-and-Mass Transfer and Flow Hydrodynamics on the Flow Accelerated Corrosion Rate in Evaporators of Combined-Cycle Unit Heat-Recovery Steam Generators

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 FAC is the leading cause of corrosion in HRSGs,[1] and is often the result of the outdated belief that oxygen scavengers are a requirement for feedwater treatment.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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Reducing And Analysizing of Flow Accelerated Corrosion at Thermal Power Plant, Heat Recovery Steam Generators

International Journal of Engineering Research and Applications ◽

10.9790/9622-0701022229 ◽

2017 ◽

Vol 7 (1) ◽

pp. 22-29

Author(s):

Akın Avşaroğlu ◽

Suphi URAL

Keyword(s):

Power Plant ◽

Thermal Power Plant ◽

Heat Recovery ◽

Thermal Power ◽

Steam Generators ◽

Accelerated Corrosion ◽

Flow Accelerated Corrosion

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Dynamic Simulation of Heat Recovery Steam Generators for Combined Cycle Power Plants (Dynamic Modeling and Characterization Tests of Evaporators)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.69.2355 ◽

2003 ◽

Vol 69 (686) ◽

pp. 2355-2362 ◽

Cited By ~ 1

Author(s):

Masakazu SHIRAKAWA

Keyword(s):

Dynamic Simulation ◽

Dynamic Modeling ◽

Heat Recovery ◽

Power Plants ◽

Combined Cycle ◽

Steam Generators

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Heat-and-Mass Transfer Intensification in Saturated-Steam Generators in NPP with VVER as a Means for Increasing Efficiency and Reliability

Atomic Energy ◽

10.1007/s10512-018-0317-5 ◽

2018 ◽

Vol 123 (3) ◽

pp. 154-158 ◽

Cited By ~ 9

Author(s):

N. D. Agafonova ◽

M. Yu. Egorov ◽

V. V. Sergeev ◽

M. A. Gotovskii ◽

P. A. Kruglikov ◽

...

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Saturated Steam ◽

Steam Generators ◽

Efficiency And Reliability ◽

Mass Transfer Intensification

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Gas Turbine Heat Recovery Steam Generators for Combined Cycles Natural or Forced Circulation Considerations

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration ◽

10.1115/88-gt-142 ◽

1988 ◽

Cited By ~ 3

Author(s):

Akber Pasha

Keyword(s):

Gas Turbine ◽

Steam Generator ◽

Heat Recovery ◽

Power Plants ◽

Natural Circulation ◽

Combined Cycle ◽

Heat Recovery Steam Generator ◽

Steam Generators ◽

Forced Circulation ◽

Gas Turbine Exhaust

In recent years the combined cycle has become a very attractive power plant arrangement because of its high cycle efficiency, short order-to-on-line time and flexibility in the sizing when compared to conventional steam power plants. However, optimization of the cycle and selection of combined cycle equipment has become more complex because the three major components, Gas Turbine, Heat Recovery Steam Generator and Steam Turbine, are often designed and built by different manufacturers. Heat Recovery Steam Generators are classified into two major categories — 1) Natural Circulation and 2) Forced Circulation. Both circulation designs have certain advantages, disadvantages and limitations. This paper analyzes various factors including; availability, start-up, gas turbine exhaust conditions, reliability, space requirements, etc., which are affected by the type of circulation and which in turn affect the design, price and performance of the Heat Recovery Steam Generator. Modern trends around the world are discussed and conclusions are drawn as to the best type of circulation for a Heat Recovery Steam Generator for combined cycle application.

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