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Liquid flow distribution and flow control with dual adjustable orifice plates or overlapping orifices

  • US 5,968,312 A
  • Filed: 06/23/1997
  • Issued: 10/19/1999
  • Est. Priority Date: 08/06/1992
  • Status: Expired due to Fees
First Claim
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1. In an effect-to-effect evaporation of a liquid a method for distribution of said liquid for downflow evaporation thereof from a pool of said liquid whereto more of said liquid is added, the improvement comprising:

  • (a) forming a multiplicity of orifices in parallel array through a plate supporting said pool of liquid for said distribution of said liquid through said orifices,(b) determining the level of said liquid in said pool and(c) adjusting the flow diameters of said orifices responsive to said level of said liquid by sliding translation of an array of orifice adjusting means adjacent to said orifices,(d) and controlling the rate of flow of said liquid through said orifices and maintaining said liquid level in said pool at about a selected level above said plate and maintaining effect-to-effect pressure control causing flashdown of said liquid, wherein said control of said rate of flow of said liquid provides for a range of said flow reduced by about 50% below an effect design point flowrate and to about 400% above said design point flowrate while maintaining said liquid level in said pool within a range of about 3 inches to 9 inches above said plate.

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