Hydrocarbon Processing - March 2022 - 72

Environment and Safety
and will adjust based on the pH. If there is
more acid gas, it will be absorbed into the
scrubbing liquid. The pH of the scrubbing
liquid will drop. The system will add more
of the reagent being used in that particular
system to raise the pH to maintain the efficiency
of the scrubber. The scrubber is
usually operated at a pH of 6-7, although
it can be operated at a higher pH if the acid
content of the inlet gas is higher than expected.
Since the system oxidizes the sump
of the scrubber, the system can function at
a higher pH without causing scaling.
If there is a baghouse upstream of the
scrubber that should fail or break, the proprietary
reverse jet scrubber can handle
Incinerator
Proprietary
reverse jet
scrubber
systema
FIG. 5. Simplified scrubbing flow scheme
downstream of the mud incinerator, with
the proprietary reverse jet scrubber systema
replacing both the lime scrubber and bag filter.
the additional particulate that would then
consequently enter the scrubber system.
The system can also handle considerable
fluctuations in the inlet gas feed rate. Gas
rates up to 120% above the design rate can
be accommodated by adjusting the caustic
rate and gas side pressure drop. As a rule
of thumb, should gas rates drop, the turndown
rate for the proprietary reverse jet
scrubber is approximately 60%.
Takeaway. The correct treatment and
disposal of refinery waste products is a
complex but critical process for an industry
beset not only with having to meet
strict environmental regulations but also
stakeholder expectations. As a result, organizations
that opt for incineration as a
disposal method utilize multiple and often
elaborate gas cleaning processes to meet
legislator requirements and improve the
sustainability of their operations. While
there are several options for treating mudincineration
offgases, a custom-designed
versatile scrubber can simplify the process.
Due to its ability to handle very hot inlet
gas temperatures, and thanks to its patented
weir bowl technology, this proprietary
reverse jet scrubber is an option that is capable
of replacing all upstream gas treating
equipment (such as the lime scrubber and
bag filter) and still deliver low SO2
and particulate
levels at the stack outlet (FIG. 5).
NOTE
a MECS® DynaWave® reverse jet scrubber
YVES HERSSENS is the Business Development
Leader of Scrubbing Technologies for Elessent Clean
Technologies (formerly DuPont Clean Technologies),
focusing on the development of the scrubbing
business in non-sulfuric acid applications in Europe,
Africa, the Middle East, India and CIS subregions. After
working with ExxonMobil in the Netherlands and in
Belgium, Mr. Herssens joined MECS (a wholly owned
subsidiary of DuPont) in 2005, and has held various
financial and commercial positions. He earned an
MS degree in business engineering and international
management from the University of Antwerp.
SARA SAFARIYEGANEH has been with Elessent Clean
Technologies (formerly DuPont Clean Technologies)
for 10 yr. Her work is focused on the process
engineering, design and commissioning of DynaWave®
wet scrubbing systems for refining and industrial
applications. This includes experience working
with sulfur recovery units, incinerators and sulfuric
acid plants. Earlier in her career, Ms. Safariyeganeh
worked in cement production for Buzzi Unicem USA.
She earned a chemical engineering degree from the
Missouri University of Science and Technology.
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