2021 Webinar Series

Modern Day Application of Tools and Technology for Acid Gas Mitigation Solutions

Date:  May 13, 2021

Time:  10:00 AM – 11:30 AM in Eastern Time (US and Canada)



Presentation #1 – GPS Denied UAS Inspections for Scrubbers by Matthew Wilson (TVA) and James Manni II (TVA)

Large equipment has always presented access difficulties for internal inspections. In this presentation, TVA reviews the technology and equipment utilized to execute Global Positioning System (GPS) denied Unmanned Aircraft System (UAS) inspections. TVA’s drone use enables a better definition of work scope and risks, for both coal unit’s wet and dry flue gas desulfurization (WFGD & DFGD) systems; all without scaffolding costs, while fitting within short outage durations. Examples of findings, access benefits, and actual video and still images discussed.

Presentation #2 – Sorbent Injection Performance Improvement by using Chemistry-Based CFD Simulations by Guisu Liu (Reaction Analytic Solutions) and Sean Dooley (Nol-Tec Systems, Inc.)

This presentation discusses about an advanced CFD tool to cost-effectively assist in identifying optimizing solutions Dry Sorbent Injection (DSI) systems, using proprietary chemical kinetic submodels for reactions between sorbent particles (Ca or Na-based) and acid gas species (SO2, SO3, HCl, Hg). Unlike conventional flow-only CFD model, the chemistry-based advanced CFD model allows for predicting gas species distributions and reduction level under specified operating conditions, therefore can be used to evaluate DSI injection system design or mixing device, as well as sorbent properties. Several recent case studies will be presented to demonstrate how this advanced tool has helped in finding the detailed DSI engineering solutions.


About the Presenters:




April 2021:  Dry Scrubber Tuning and Performance Factors

The link to watch the archived webinar is below

Presentation #1 – Multi-Instrumentation Approach for Fine Tuning of Dry Scrubber Operation by Paulo Oliveira (Envea)

With the combination of the most modern technology for industrial process optimization, end user experience with the operation of dry gas scrubbing technology could be facilitated to its greatest extension by applying existing user-friendly and available instrumentation controls and gas analyzers.  The combination of SO2 gas analyzers upstream and downstream of the dry scrubber, very accurate measuring of sorbent injection rates and reliable baghouse operation monitoring sensors offer considerable savings in operation and maintenance for the life of the plant.  In this example rich very interactive webinar, ENVEA will describe each technology individually and the benefits of bundling them up in one optimization package, describing achievable savings that any dry scrubber operator can count on.

Presentation #2 – SDA Performance Factors and Upgrade Options by Michael Klidas (Babcock & Wilcox)

To help achieve compliance with updated state implementation plans, this paper discusses some of the primary performance factors around Spray Dryer Absorber (SDA) systems and upgrade options. The information presented in this paper is based on performance evaluations at various utilities, pilot scale data, B&W performance prediction tools, available literature, and operating data from B&W installations. Common SDA problem areas which will be discussed include lime slaking, recycle slurry preparation, drying, SDA control system, and particulate control device operation and ash handling. In addition to recommendations on possible problem areas, emissions upgrade options include spray chamber upgrades or replacement, control system upgrades, and the introduction of additional dry hydrated lime upstream of the SDA.


You can find the April 20th DSUA webinar recording at 

DSUA – Dry Scrubber Tuning and Performance Factors (April 20, 2021) – YouTube


Thank you to our 2021 Webinar Sponsors











2021 In-Person Conference Cancelled – Monthly Webinars Will Continue

The DSUA remains focused on the health and safety of our attendees, partners, and conference staff.  We all anticipate and enjoy our time sharing, learning, and socializing during conference week.  Unfortunately, due to the events related to the COVID-19 pandemic and the uncertainty of how long quarantine and social distancing guidelines will remain in place, the board has elected to cancel the in-person conference for 2021.  We will proceed with monthly webinars in 2021 similar to what DSUA did in 2020 in an effort to continue sharing dry scrubbing knowledge and experience in a virtual format until we feel it is appropriate to resume an in-person conference.  DSUA hopes that by the end of 2021 we have better clarity on our plans for 2022.  We look forward to your participation in the 2021 DSUA webinars!  Please don’t hesitate to contact us with any questions, comments, concerns.

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