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Scrubber Design for Gas-Liquid Separation: A Holistic Approach

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Course Credit: 0.15 CEU, 1.5 PDH

Scrubber design is not a simple matter of selecting whatever demisting technology you want and applying a K-factor. First the required separation performance must be determined based on the service. Then scrubber design starts upstream with the inlet piping sizing, components (valves, etc.) and routing. Proper inlet design ensures a stable flow regime, low entrainment of liquid into the gas due to shearing, and prevents swirling flow from entering the scrubber. A low shear inlet distributor is necessary to minimize shearing of large droplets into smaller harder to separate droplets and to provide adequate distribution into the vessel. The scrubber design should also account for proper disengaging space for bulk liquid separation (gravity separation) and flow distribution between internal elements. The demisting technology selection must account for drop size, the liquid load expected to be carried by the gas to the demisting device, the gas flow rate (velocity), the surface tension and viscosity of the liquid, the expected density driving force for separation, the operating temperature/pressure of the system, fouling potential, and the required separation efficiency. Even the gas and liquid outlet designs can impact the separation. All of these elements must be integrated to provide sustained efficiency of the scrubber across its operating range.

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 1 chapter

Course Chapters

  • 1Scrubber Design for Gas-Liquid Separation: A Holistic Approach - Chapter 1
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Earn credits by completing this course0.15 CEU credit1.5 PDH credits


Jimmie Riesenberg