Page 18 - Industrial Plant 2020

cause of CO formation, was proposed, however the therefore minimizing shut-down time.
client decided not to carry on due to the plot plan Wood created a process study to cover the analysis
limitation for the new equipment installation and the and feasibility evaluation for the installation of a CO
shut-down duration, which would be too short to oxidation catalyst package.
introduce the modifications. The study was developed according to the client’s
requests and complying with the following requirements:
The alternative option was the • no impact on the footprint,
installation of a CO Oxidation catalytic • minimum shut-down duration,
converter system on the flue gas • catalyst packages on three parallel flue gas ducts,

ducting which was discussed and with the possibility to isolate each bed
agreed between the client and Wood independently for catalyst replacement.
to overcome the limitations.
This solution was designed and Catalyst vendors as BASF, Johnson Matthey, Emission
provided as a full package to Partner, UMICORE were contacted.
shorten the installation period during All of them were not prepared for this type of request,
turnaround and therefore minimizing as normally a CO oxidation catalyst is provided for
shut-down time smaller (engines) or bigger (boilers, incinerators)
systems, and not for clean and fully controllable
The alternative option was the installation of a CO combustion.
Oxidation catalytic converter system on the flue gas
ducting which was discussed and agreed between the Nevertheless, all were strongly committed to this
client and Wood to overcome the limitations. This challenge. The flue gas was proved dust free and
solution was designed and provided as a full package combustion was with fuel gas only. On this basis
to shorten the installation period during turnaround and catalyst system was designed to achieve (Figure 2):
• CO content decrease from 685 mg/Nm3 to 40
mg/Nm3
• guaranteed catalyst life of 2 years, expected
catalyst life longer than 3 years depending on the
actual operating conditions
• no need of cleaning or maintenance
• minimized flue gas pressure drop
Wood’s FW Fired Heaters team engineered the
package which include catalyst support, guillotines to
Figure 2: conceptual catalyst system allow single catalyst bed isolation, regulation dampers

Figure 3: engineered catalyst package

INDUSTRIAL PLANTS - May 2020
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