Drying and gas or vapor contact with solids – Process – With nondrying treating of material
Reexamination Certificate
2000-02-07
2001-10-30
Wilson, Gregory (Department: 3749)
Drying and gas or vapor contact with solids
Process
With nondrying treating of material
C034S381000, C210S770000, C110S221000
Reexamination Certificate
active
06308435
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to the field of treatment and use of municipal waste; and more particularly, it relates to the drying of such waste material after it has been burned in a waste energy facility.
(2) Description of the Related Art
U.S. Pat. No. 5,992,776 issued on Nov. 30, 1999, describes a process for treating municipal waste combustion ash to recover the values of the combustion ash substantially free of unburned debris and metals, especially ferrous metals.
BRIEF SUMMARY OF THE INVENTION
The present invention relates to a process and a facility for treating municipal waste combustion ash having a high moisture content to a drying operation and recovering an ash with a moisture content of not more than about 28%. The process includes draining water from wet masses of the raw ash spread out in rows on a floor in an enclosed dehumidified atmosphere for a time sufficient to reduce the moisture content to not more than about 28%. The enclosed atmosphere may be warmed to about 80-120° F. The facility for undertaking this process includes an underground covered water storage basin with a plurality of parallel drainage channels sloped to drain water by gravity to one side of the facility to a common gutter and thence to a covered storage basin for treatment and/or disposal. Each channel is covered with a removable metal plate having a plurality of spaced drainage slots for directing the drained water into the underground channels. The facility is closed to the atmosphere and equipped with sufficient dehumidification equipment to dry the interior atmosphere to accomplish the necessary drying of the ash in an appropriate time period.
REFERENCES:
patent: 3623438 (1971-11-01), Cardinal, Jr.
patent: 4049391 (1977-09-01), Marsh
patent: 5536420 (1996-07-01), Oyzboyd
Arcaini Gianni B.
Bruno Nicholas
Strach Larry
DUOS Engineering (USA), Inc.
Wilson Gregory
Yeager Arthur G.
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