Method and apparatus for feeding waste material to a dry kiln
OwnerRicky W. Davenportinventor
Life of this patent
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Abstract
A method and apparatus for receiving, processing, and delivering waste materials to the interior of a rotary cement kiln to be burned therein. Apparatus includes a feeding mechanism which provides continuous in-feed of entrained solids or solid waste, materials including hazardous waste material having low fuel value, directly into the calcining zone of the kiln. A bulk receiving system is provided for receiving, processing and transferring materials from one or more collection stations. The system further includes processing for sizing and segregating metal extracted from a contaminated hazardous waste stream. Methods are provided for providing induction of forced, combustion air directly into the calcining zone of a rotating cement kiln.
Claims42
An apparatus for the continuous feeding of combustible waste materials directly into the calcining zone mineral bed, of a precalcining type rotating cement kiln having a mineral infeed/exhaust riser duct comprising:
- a) a rotary dry type cement kiln cylinder, having a calcining zone adjacent a mineral in-feed/exhaust riser duct;
- b) a stationary extrusion tube, adapted to said in-feed/exhaust riser duct, extending into said calcining zone;
- c) a continuous combustible waste feed means, attached to said extrusion tube, for feeding and compacting said combustible waste material into a cake within said extrusion tube and forcing said compacted cake directly into said calcining zone mineral bed;
- and
- d) at least one continuous waste transfer means associated with said waste feed means for conveying waste material from a receiving station to said continuous waste feed means.
A method of delivering compacted combustible waste material continuously into the calcining zone of a precalciner type, rotating, cement kiln cylinder having a stationary riser duct for receiving preheated mineral material including the steps of providing at least one stationary collection apparatus for receiving said waste material to be fed into said rotating cylinder, connecting thereto a feeding apparatus having an extrusion tube attachable thereto, penetrating said stationary riser duct with said extrusion tube, and fixedly extending said extrusion tube into said calcining zone, and during rotation of said cylinder, transferring said waste material from said stationary collection apparatus through said feeding apparatus, compacting said waste material within said extrusion tube and continuously forcing said waste material directly into the calcining zone of said rotating cement kiln cylinder for burning within mineral material.
A method of delivering waste material on a continuous basis into the calcining portion of a rotating cement kiln of the precalciner type having a mineral bed including the steps of delivering waste material to be introduced into the cement kiln to a stationary collection and processing apparatus, transferring the material from said stationary collection apparatus to a stationary feeding apparatus having an extrusion tube attached thereto, feeding the material in a continuous manner through the feeding apparatus and extrusion tube, and discharging said material in a compacted form for incineration in the mineral bed.
A method of delivering material in a substantially, continuous manner into the calcining portion of a rotating cement kiln of the preheater or precalciner type having a mineral bed including the steps of delivering a fluidized material to be introduced into the cement kiln to a stationary collection apparatus, transferring the fluidized material from said stationary collection apparatus to a stationary feeding apparatus having an extrusion tube attached thereto, feeding the fluidized material through said feeding apparatus, and discharging the material as a continuous fluidic stream into said calcining zone of said kiln for incineration in the mineral bed.
A method of processing hazardous waste material prior to feeding said material into a rotary cement kiln comprising the steps of receiving said material in sealed containers, transferring said containers to an air lock connected to an inert gas atmosphere, sealing said air lock to ambient air, transferring said containers to a shredding unit also having an inert gas atmosphere, shredding said sealed containers and waste material, separating metals from said waste material, agitating and further sizing said metals in a dispersion unit, and washing and drying said metals.
Dependencies are inferred from the claim text.