Is there any guidance that chemical vendors (or design folks) use around minimum differential pressure requirements for ensuring good dispersion of overhead filmer stream and neutralizer stream (via an injection quill) in the overheads of a crude unit for corrosion control?
Answers
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02/02/2015
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A:
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
I would suggest talking to the quill manufacturer. Because the flows are so small in these systems, you will likely need a carrier stream to get enough flow to create adequate DP with a reasonably sized orifice in the quill. For filmer, a slipstream of reflux or top pumparound hydrocarbon is typically used. For the neutralizer, steam or the same material as used for filmer carrier is often used. Some chemical suppliers do not recommend use of a carrier stream on the neutralizer, claiming that the heat will cause it to rapidly vaporize anyway. I personally still think the use of a carrier stream such as steam is best to ensure good distribution and rapid vaporization. Note that the steam's purpose is to disperse the neutralizer not to provide the heat to vaporize it.
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