Adding a Tray to a Wet FGD Absorption Tower: A Simple but High-Impact Upgrade for an Existing Absorber

Presented at: Power-Gen Asia
September 20-22, 2016
Seoul, South Korea

Ted R. Parsons, Justin P. Chenevey, and Joseph M. Mitchell - The Babcock & Wilcox Company (B&W), Barberton, Ohio, USA


Wet flue gas desulfurization (FGD) is an established technology with hundreds of installations
worldwide. Many of these installations became operational more than a decade ago and have
plenty of opportunity for performance improvements. With more stringent emissions
requirements (SO2 and particulate matter), it often becomes necessary to upgrade these wet
FGDs in an economical manner. The Babcock & Wilcox Company (B&W) has recently used its
tray technology to upgrade two wet FGDs on coal-fired power plants. The first plant had an
existing spray tower wet FGD achieving less than 97% SO2 removal with dibasic acid (DBA)
addition. B&W added one tray to this installation and was able to achieve 99% SO2 removal
while also eliminating the need for DBA. The second plant is an existing single tray spray tower
wet FGD in which B&W added a second tray to allow for a higher fuel sulfur and increase overall
SO2 removal efficiency. The equipment changes, operational changes, and performance will be
discussed. The paper will also review wet FGD spray tray tower design, which can be optimized
for particulate removal.

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