Adjustable division plate for classifier coal flow control

{
  "publication_number": "US9689568B2",
  "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 solid particle flow distribution controller comprising: a plurality of division plates proximate a division between an upstream solid particle conveyance pipe and a plurality of downstream pipes; and a plurality of extension plates, each of the extension plates movably mounted proximate to a respective division plate for movement in an upstream and downstream direction with respect to the division plate, wherein the plurality of extension plates are movably mounted for motion in the upstream and downstream direction independent of one another to extend upstream of the division plates to improve solid particle distribution among the downstream pipes.",
    "2. A solid particle flow distribution controller as recited in claim 1, wherein the extension plates are mounted to their respective division plates by way of tracks configured to guide movement of the extension plates.",
    "3. A solid particle flow distribution controller as recited in claim 1, wherein each extension plate is operatively connected to an actuator for moving the extension plate, wherein the actuator is selected from the group consisting of a manual actuator, an electrical actuator, a pneumatic actuator, and a hydraulic actuator.",
    "4. A solid particle flow distribution controller as recited in claim 1, further comprising: a coal classifier having an inlet and a discharge skirt having a plurality of outlets, wherein the division plates are mounted within the interior of the discharge skirt proximate an upstream portion of the plurality of outlets, wherein the extension plates are radially inward of the discharge skirt and are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of their respective division plates to improve coal particle distribution between the outlets of the discharge skirt.",
    "5. A solid particle flow distribution controller as recited in claim 4, wherein the discharge skirt has an interior divided into a plurality of circumferentially segmented chambers by the division plates mounted within the discharge skirt for dividing flow from the inlet to a plurality of outlet pipes downstream of the coal classifier, wherein the extension plates are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of their respective division plates to improve coal particle distribution between the chambers of the discharge skirt.",
    "6. A solid particle flow distribution controller as recited in claim 4, further comprising a feed pipe extending through the coal classifier along a centerline thereof.",
    "7. A solid particle flow distribution controller as recited in claim 4, further comprising a center pipe mounted within the classifier for control of an adjustable return baffle for prevention of reverse air flow through the classifier or re-entrainment of coarse particles."
  ],
  "description_excerpt": "1. Field of the Invention\n\nThe 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.\n\n2. Description of Related Art\n\nIn 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": [
    "John Rath",
    "Murat Yaldizli"
  ],
  "filing_date": "2013-01-11",
  "publication_date": "2017-06-27",
  "grant_date": "2017-06-27",
  "priority_date": "2012-01-13",
  "application_number": "US-201314371951-A",
  "family_id": "48781951",
  "cited_by_count": 0,
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}