Waste fuel delivery to long kilns

  • US 5,224,433 A
  • Filed: 11/17/1992
  • Issued: 07/06/1993
  • Est. Priority Date: 11/23/1988
  • Status: Expired due to Term
First Claim
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1. Method for charging combustible waste to a rotary cement kiln comprising a rotating kiln cylinder to burn said waste in contact with in-process mineral material, said method comprising the steps ofmodifying said cement kiln to provide a port in the rotary kiln cylinder at a point along its length where waste charged through the port will contact calcining mineral during kiln operation, said port having a closure moveable between a port-closed and a port-opened position;

  • 2) positioning the waste in alignment with said port during rotation of the kiln cylinder;

    3) moving the port closure to the port-opened position and charging the waste into the kiln through the port;

    4) moving the port closure to the port-closed position; and

    5) repeating steps 2-4 during kiln operation whereby combustible waste is used to provide up to 40% or more of the energy requirements of kiln operation.

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