Waste fuel delivery to long kilns
AssigneesCadence Chemical Resources, Inc., Ash Grove Cement Company
InventorsMichel R. Benoit, Eric R. Hansen, Theodore J. Reese
Life of this patent
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Abstract
A method is described for environmentally sound usage of combustible hazardous waste in an operating rotary kiln. The method is particularly adapted for disposal of solid hazardous wastes, optionally in the form of a blended waste homogenate, Packaged in sealable containers. The containers are used as fuel modules and charged into a rotary kiln cylinder where kiln gas temperatures range from about 950.degree. to about 1200.degree. C. to achieve high destruction and removal efficiencies.
Claims11
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 of
- 1) modifying 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.
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 of:
- 1) modifying 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;
- 2) modifying said kiln to provide a fuel receiving chute for aligning the waste with the port;
- 3) during kiln operation, locating the waste in the fuel receiving chute;
- 4) charging the positioned waste through the port into the rotary cylinder;
- 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.
Dependencies are inferred from the claim text.