A venturi gas scrubber (ejector) made of Nickel-Chromium-Molybdenum (Ni-Cr-Mo) alloy UNS N06200 located in a Continuous Catalyst Regeneration (CCR) unit. failed prematurely after 1.5 years in operation. The scrubber was used to neutralize hydrochloric acid (HCl) and chlorine present in the regeneration tower vent gas using caustic injection (1 wt.% NaOH). A metallurgical failure analysis investigation concluded that the scrubber had failed due to hydrochloric acid (HCl) corrosion. In general, many alloys are susceptible to HCl corrosion at different acid concentrations. Originally, the scrubber was made of alloy UNS N10665 but was changed to alloy UNS N06200after multiple failures. Recommendations are provided to prevent similar damage recurrence.

Subject
Pits, Corrosion failures, Materials, Corrosion resistant alloys, Nickel based alloys, Nickel chromium molybdenum alloys, Scrubbers, Liquids, Regeneration, Towers, Corrosion resistance, Hydrochloric acid, Samples
Keywords:
Hydrochloric Acid, HCl Corrosion, UNS N06200, CCR, Venturi Scrubber
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2022
Association for Materials Protection and Performance (AMPP)
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