Adjustable division plate for classifier coal flow control

{
  "publication_number": "US9982889B2",
  "country": "US",
  "kind": "B2",
  "title": "Adjustable division plate for classifier coal flow control",
  "abstract": "A solid particle distribution controller includes a plurality of division plates proximate a division between an upstream solid particle conveyance pipe and a plurality of downstream pipes. The solid particle distribution controller also includes a plurality of extension plates. Each of the extension plates is movably mounted proximate to a respective division plate for movement in an upstream and downstream direction with respect to the division plate. The plurality of extension plates are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the division plates as needed to improve solid particle distribution among the downstream pipes.",
  "claims": [
    "1. A method of retrofitting a solid particle classifier comprising: providing a plurality of extension plates at a solid particle classifier, the solid particle classifier having a plurality of division plates mounted within a discharge skirt; and installing the plurality of extension plates proximate a respective one of the division plates in the solid particle classifier, wherein the extension plates are movably mounted for motion in an upstream and downstream direction independent of one another relative to their respective division plate to extend upstream as needed to improve solid particle distribution between outlets of the discharge skirt.",
    "2. A method of retrofitting as recited in claim 1, wherein installing the plurality of extension plates includes replacing a portion of the classifier, wherein replacing a portion of the classifier includes replacing a discharge turret of the classifier.",
    "3. A method of retrofitting as recited in claim 1, wherein installing the plurality of extension plates includes removing a portion of at least one of the division plates.",
    "4. A method of retrofitting as recited in claim 1, wherein installing the plurality of extension plates includes installing respective division plates in the classifier, wherein the classifier does not have preexisting division plates."
  ],
  "description_excerpt": "1. Field of the Invention The present invention relates to systems for conveying solid particles through gas flows, and more particularly to coal pulverizer (mill) discharge piping systems wherein coal particles are conveyed through air flows. 2. Description of Related Art In coal combustion systems, coal and primary air (PA) flow distribution between burner lines is important for optimizing combustion and burner performance. Low NO x burner design usually requires that coal mass flow imbalance between coal pipes should be within +/−15% deviation from the mean value, or lower, to ensure burner performance. Imbalanced coal flow between coal pipes also negatively impacts combustion efficiency, as indicated by unburned carbon (UBC), heat rate, heat balance etc., as well as gaseous emissions such as NO x, CO, etc. Orifices (fixed or variable) installed in the coal pipes for PA (primary air) flow adjustment are unable to correct the coal flow imbalance without having adverse effects on the PA flow distribution, when this imbalance is a result of uneven coal flow discharged from an upstream classifier.\n\nTo resolve the coal flow distribution shortcomings in the art, there exists a need in the art for a coal flow distribution system that provides a tool to correct particle flow distribution between coal pipes. There also remains a need in the art for such a system that has little or no negative impact on PA flow distribution between coal pipes. The present invention provides a solution for these problems.",
  "cpc": [
    "F23K 3/02",
    "B65G 53/04",
    "B65G 53/528",
    "F23K 2201/10",
    "F23K 2201/30",
    "F23K 2203/006",
    "F23K 2203/104",
    "F23K 2203/105",
    "F23K 2203/201",
    "Y10T 29/49716"
  ],
  "ipc": [
    "B65G 53/04",
    "B65G 53/38",
    "B65G 53/52",
    "F23K 3/02"
  ],
  "assignees": [
    "BABCOCK POWER SERVICES INC"
  ],
  "inventors": [
    "RATH JOHN",
    "YALDIZLI MURAT"
  ],
  "filing_date": "2017-01-11",
  "publication_date": "2018-05-29",
  "grant_date": "2018-05-29",
  "priority_date": "2012-01-13",
  "application_number": "US-201715403280-A",
  "family_id": "48781951",
  "citations": [
    "JPS63271019A",
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  ]
}