Scrubber Employed to Treat Hydrogen Sulfide
A Refinery customer changed from black wax crude to yellow wax crude. The yellow wax crude was much more volatile and contained higher levels of hydrogen sulfide and other dangerous gases. The refinery planned on using a heated fixed roof tank until a floating roof tank could be built to accommodate the new crude. GEM was asked to provide an automated temporary vapor control system on the fixed roof tank which would turn on the blower system and pull vapors through the scrubber train based on a change in tank pressure.
GEM proposed an automated system which was able to control the tank pressure without emitting any vapors to the atmosphere while also controlling vapor emissonss. The treatment system was designed to remove H2S and a high concentration of VOCs from the product stream. It consisted of a two caustic scrubbers, two diesel scrubbers, and two carbon beds, all connected in series. The customer stressed the importance of redundancy, and therefore, GEM designed in redundant equipment for every step of the process.
The customer was able to use the fixed roof tank for the yellow wax crude without incident, and refine the product which brought distinct economical advantage to their company while maintaining environmental compliance. GEM trained on-site refinery personnel to perform routine vapor monitoring, thus avoiding additional labor expense.
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