Lots of choices for Demineralization and Degasification of HRSG Water - Hot
Topic Thursday, August 28
The early birds heard some good but unfortunately unrecorded discussions between
Bob Markle of
Membrana and
Michael Snow of
SnowPure relative to some of
the advantages of combining membrane contactors and EDI.
The comments and presentations when we started recording were of
similarly high quality as the focus was on the choices that need to be made by
purchasers and operators of ultrapure water systems for gas turbine combined
cycle power. The free site, which is the basis of the continuing discussions, is
Degasification and Demineralization.
Overview by Bob McIlvaine of McIlvaine
Degasification and Demineralization
is a continually updated website to empower decision making by plant owners. It
is also part of
Gas Turbine and Combined
Cycle Decisions.
The types of issues which need to be addressed
are
EDI vs.
IE, FD deaerators vs.
membrane contactors, and nitrogen vs.
vacuum air degassing. Listing the choices which McIlvaine
calls decisive classification is not that easy. For example, the next speaker
explained why.
Overview
Critical Measurements by Jean Holz of Hach
Jean described which measurements were needed at each point in the boiler
feedwater and condensate return system. When asked about optical vs.
electrochemical choices, she replied that the range of choices depend on the
point at which you are measuring and whether you need to measure a few ppb or
some higher number. She observed that dissolved oxygen is measured in three
accepted methods: Winkler Titration, Clark Cell Electrodes, and
Luminescence-based Optodes. LDO has
proven to be the best choice except where you need to measure at very low
levels.
Hach supplies instruments to measure boiler feedwater quality.
FAC issues by Brad Buecher
Flow accelerated corrosion is an important issue causing problems in turbulent
areas such as elbows. The condition occurs when steel is in contact with water
with almost no oxygen. You must first take into account whether you are using
any copper tubing. If not you can
raise the oxygen content slightly.
Activities of Ultrapure Water Magazine
by Mike Henley
Ultrapure Water
covers power as well as other ultrapure water applications. There are more than
1,000 archived articles.
Electrodeionization for Silica removal by Michael Snow of SnowPure
The choice of EDI plus membrane contactors is the way to deal with high silica
content. You need the membrane contactors to reduce the CO2 rather
than rely on EDI to achieve both tasks.
There are many such combinations on power plants in China. Michael
observed that some of the Chinese power plants have the most extensive equipment
while others have tried to minimize costs.
Coverage of Membrane Contactors by Bob Markle of Membrana
Membrane contactors provide CO2 reduction more cost effectively than
forced deaerators. The advantages are the small footprint and high efficiency.
The membrane prevents particulate in the sweep air from contaminating the water.
With nitrogen sweep air very low oxygen levels can be achieved.
http://www.mcilvainecompany.com/DegasDeminAnalysis/Subscriber/Default.htm
Click: (Subsidiary) Membrana
Time ran out on our 90 minute session and we did not have time to cover the use
of UV for TOC removal.
Here are some articles which did not get posted in advance and the webinar
participants with those companies. We will be posting these articles in the next
few days.
Ø
Jeff Tate, Agape - Advantages of EDI
Ø
Mandeep Rayat, Eco-tec - Using municipal reclaimed water for 600 MW cc plants
Ø
David Gray, Mettler Toledo – Chemistry monitoring presentation from 2013
McIlvaine Webinar
Ø
Kaveh Someah, Ovivo - RO and IE in upgrading Dutch power plant
Ø
EPRI Guidelines for ACC - (Does UPW
change if you use ACC e.g., iron transport is higher)
The individual presentations follow:
Demineralization and Degasification Webinar - Hot Topic Hour August 28, 2014
Advantages of combining membrane contactors and EDI. Focus on the choices that need to be made by purchasers and operators of ultrapure water systems for gas turbine combined cycle power.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, SnowPure, Ultrapure Water, Kiewit, Ultrapure Water, Membrane, EDI, Corrosion
Ultrapure Water covers power as well as other ultrapure water applications. There are more than 1,000 archived articles.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, Ultrapure Water, Ultrapure Water, Oxygen, Demineralization
Flow accelerated corrosion is an important issue causing problems in turbulent areas such as elbows.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, Kiewit, Oxygen, Demineralization, Corrosion
Improving Silica Removal by EDI and GTM by Michael Snow, SnowPure
The choice of EDI plus membrane contactors is the way to deal with high silica content.
Revision Date: 8/28/2014
Tags: 221112 - Fossil Fuel 化石燃料, SnowPure, Membrane, EDI, Demineralization, Corrosion