NDLI: Admission of Bypass Steam Into a Water Cooled Condenser and Air Cooled Condenser: Similarities, Differences and Areas of Concern

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nadig, Ranga Sanderlin, Dave
Copyright Year	2014
Abstract	In power plant locations with adequate supply of cooling water the steam from the steam turbine is condensed in a water cooled condenser. In most instances circulating water from the cooling tower is used to condense the turbine exhaust steam. In other instances once through cooling is deployed wherein water from a lake, river or sea is used to condense the turbine exhaust steam. In water challenged locations or locations where wet cooling cannot be deployed due to permitting or regulatory issues, the steam from the steam turbine is condensed in an air cooled condenser (ACC) wherein ambient air is used to cool and condense the turbine exhaust steam. In a combined cycle plant, during normal operation, the water or air cooled condenser condenses the turbine exhaust steam. During bypass operation, when the steam turbine is out of service, the high-pressure steam from the HRSG is attemperated in a pressure reducing/desuperheating (PRD) valve and then admitted into the water cooled or air cooled condenser. The bypass steam flow is substantially higher than the design turbine exhaust steam flow and the duration of bypass operation can vary from a few hours to several weeks. The requirements for admission of bypass steam into a water cooled condenser are substantially different from that for an air cooled condenser. In a water cooled condenser the bypass steam is admitted in the steam dome. The bypass steam as well as the turbine exhaust steam is condensed outside the tubes. In an air cooled condenser the bypass steam is admitted in the large diameter steam duct. The bypass, as well as the turbine exhaust steam (normal operation), is condensed inside the tubes. There are similarities and differences in the requirements for admission of bypass steam into a water cooled and air cooled condenser. The differences must be identified and addressed to ensure safe and reliable performance of the condenser.
Sponsorship	Power Division
File Format	PDF
ISBN	9780791846087
DOI	10.1115/POWER2014-32249
Volume Number	Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance; Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues
Conference Proceedings	ASME 2014 Power Conference
Language	English
Publisher Date	2014-07-28
Publisher Place	Baltimore, Maryland, USA
Access Restriction	Subscribed
Subject Keyword	Water Cooling Seas Condensers (steam plant) Ducts Heat recovery steam generators Valves Rivers Steam turbines Flow (dynamics) Pressure Exhaust systems Design High pressure (physics) Domes (structural elements) Steam Lakes Power stations Cooling towers Turbines Combined cycle power stations
Content Type	Text
Resource Type	Article

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