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Process Absorber Retrofit, Kronos, Leverkusen, Germany - Case Study
Problem
Removal of Hydrogen Sulphide from gas streams with significant Carbon Dioxide partial pressures have been severely limited in the efficiency of absorption mass transfer rates, due to the interference between the two components. Kronos needed both an increase in throughput by de-bottlenecking the existing unit which was dynamically limited by its original design, and an improvement in H2S removal to meet tighter downstream waste gas emission limits.
Solution
Kronos in Germany use chelate solution to remove the H2S, with a combination of venturi & mobile bed ball scrubbers. There was no space to add additional balls, nor power available on the fan. No improvements could be made on either the gas or aqueous sides without large capital investments and risk of considerable production down time.
Commissioned by Kronos, FTL/Osprey embarked on a rapid initial study and computer model simulation of the process with a view to optimising and upgrading the absorption process. Once the necessary projections of process manipulation had been presented a full-scale process upgrade on one of their production lines was sanctioned. This involved a fast retrofit under joint supervision of a mobile bed scrubber.
Results
By retrofitting the existing mobile bed to TurboScrubber mode with the patented TurboPak® fluidised bed packing elements, and adjusting the liquid side-operating parameters within the available limits, we achieved the following improvements, achieving production and emissions targets without massive capital and running costs or the upheaval of installing additional production plant:
- Reduced bed height
- Massively boosted mass transfer rates
- Increased tower capacity by up to 100%
