Modified cement kiln for burning combustible solid waste as supplemental fuel

  • US 5,724,899 A
  • Filed: 08/09/1994
  • Issued: 03/10/1998
  • Est. Priority Date: 11/23/1988
  • Status: Expired due to Fees
First Claim
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1. A method for achieving environmentally sound disposal of combustible solid waste in an operating rotary cement kiln comprising a heated, rotating cylinder containing in-process mineral material, said method comprising the steps ofmodifying the kiln by forming a port in the rotating cylinder at a point along the length of the kiln cylinder where the kiln gas temperature ranges from about 950°

  • C. to about 1200°

    C., and providing a closure for said port and means for moving said closure between a port-opened and port-closed position at predetermined times during rotation of the cylinder and a drop tube communicating with said port and extending into the kiln cylinder to prevent contact of the in-process mineral materials with the closure; and

    during kiln operation moving the port closure between a port-opened and port-closed position at predetermined times during kiln cylinder rotation and delivering the combustible waste through the port and drop tube into the rotary vessel when the closure is in the port-opened position.

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