Boiler Feed and Cooling Water Treatment is Hot Topic Hour on January 27, 2011
The importance of correct water treatment for boiler feed and cooling water
cannot be over emphasized especially in modern boilers with a high evaporative
rate. Dissolved solids in feedwater become concentrated and form deposits
(scale) inside the boiler and steam system resulting in poor heat transfer that
reduces the efficiency of the boiler. Dissolved gases such as oxygen and CO2
will react with the metals in the boiler system and lead to corrosion. Proper
treatment of feed and cooling water to remove solids and gases will ensure
maximum life of boilers, steam turbines, condensers and pumps; reduce
maintenance expenses and allow optimal thermal performance for maximum
efficiency. With increasing Federal and State regulations limiting access to
surface and ground water, minimizing water usage by reducing blowdowns or
recirculating water also become important factors in the selection of water
treatment methods.
Feedwater can be conditioned before entering the water systems (external
treatment) or within the water system (internal treatment). In general, external
treatment is used when the amount of one or more of the feedwater impurities is
too high to be tolerated by the boiler system in question. There are many types
of external treatment (softening, evaporation, deaereation, membrane
contractors, etc.) which can be used to tailor-make feedwater for a particular
system. Internal treatment is the conditioning of impurities within the water
system by addition of chemicals. Internal treatment may be used alone or in
conjunction with external treatment to control water hardness, condition sludge,
scavenge oxygen and prevent boiler water foaming. Externally treated high purity
feedwater reduces the use of boiler chemicals due to less frequent blowdown
requirements (by as much as a factor of 10) resulting in less water usage and
lower fuel costs.
There are a wide variety of water treatment systems available, but which system
is most economical for a specific plant considering energy requirements,
chemical costs and performance? This decision is partially dictated by the
minerals and compounds in the water as well as the chemical and physical
composition of the raw or recirculating water. It is also affected by the design
and operating characteristics of the boiler, steam system and cooling system.
The following speakers will describe the latest technologies to treat feed and
cooling water from natural and process sources and discuss the economics of
various treatment technologies focusing on energy use, chemical requirements,
capital costs, reuse of process water and operation and maintenance costs and
issues.
Dave Christophersen, Vice-president and Technical Manager at Crown Solutions, a
subsidiary of Veolia Water Solutions & Technologies, will discuss how water
sourcing, energy efficiency and system designs all converge to make boiler and
cooling water treatment even more important today to manage correctly. This
presentation will look at water footprint, boiler pretreatment equipment
selection options, boiler internal treatment chemistry, cooling water treatment
equipment and chemistry and the importance of life cycle costs. Problems
associated with boilers and cooling systems will be discussed as well as
methodologies to avoid problems.
Dan Cicero, Senior Industry Development Manager at Nalco Company Power Group,
will discuss control of feedwater chemistry based on ORP measurement. In 1994,
EPRI published chemistry guidelines recognizing the benefits of feedwater
chemistry control based on ORP. 3D TRASAR Boiler Technology controls feedwater
chemistry based on ORP measured at temperature and at pressures up to 2800 psig.
This presentation will explain the benefits of using this technology in a power
plant boiler system.
Gregg Poppe, Global Application Development Specialist for Industrial Water and
Power Generation at Dow Water & Process Solutions, will discuss how to achieve
lower operating costs and better water quality with more advanced ion exchange
system designs. While reverse osmosis has displaced ion exchange in the bulk
demineralization step in many steam generation plants, ion exchange is still a
very competitive technology choice for facilities where lower-TDS feed streams
are used. To reduce the consumption of chemicals and water during regeneration
and to achieve better water quality, optimized IX system design can be used.
Chemical usage, water usage, and typical water quality that can be achieved will
be compared for basic co-flow systems vs. counter-flow and packed bed systems.
To register for the "Hot Topic Hour" on January 27, 2011 at 10 a.m. CST (Chicago
time), click on: on: http://www.mcilvainecompany.com/brochures/hot_topic_hour_registration.htm
Bob McIlvaine
President
847 784 0012 ext 112
rmcilvaine@mcilvainecompany.com
www.mcilvainecompany.com
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191 Waukegan Road Suite 208 | Northfield | IL 60093
Ph: 847-784-0012 | Fax; 847-784-0061
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