Furnaces – With fuel treatment means – Preliminary refuse treatment means
Patent
1984-06-14
1986-11-18
Yuen, Henry C.
Furnaces
With fuel treatment means
Preliminary refuse treatment means
110165R, 110254, 110255, 34189, F23G 504
Patent
active
046229035
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a sewage screenings disposal system which takes raw screenings such as paper, cloth and plastic based materials as supplied from sewage bar screens, reduces the moisture content by pressing and allows disposal by incineration with a minimum of auxiliary fuel, provides storage of the pressed screenings and ultimate reduction of the screenings to an inert inactive material suitable for disposal by landfill, and at the same time substantially reduces the screenings by up to 98% in both weight and volume. It is generally accepted that raw screenings have a moisture content of approximately 85%-90% and a density of approximately 870 Kg/m.sup.3.
SUMMARY OF THE INVENTION
According to the present invention the screenings disposal system comprises, dewatering press means for reducing the moisture content of the raw screenings, loader means for loading slugs of pressed screenings from the dewatering press means into a storage carousel, feeder means for feeding the slugs of pressed screenings from the carousel into an incinerator, and means for removing the resultant ash from the incinerator.
A conveyor means may be provided to carry raw screenings from a conventional bar screening means to a loading hopper on the dewatering press means.
The incinerator may include a rocking type agitating grate system incorporating a grate obstruction control system.
The plant may be manually controlled or be fully automatic under a programmable logic control.
DESCRIPTION OF EMBODIMENT
In order that the invention and its manner of performance will be more fully understood, reference will now be made to an embodiment of the invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a sectional side elevation through the apparatus;
FIG. 2 is a sectional side view of the screenings conveyor and dewatering press taken along the line 2--2 of FIG. 1;
FIG. 3 is a sectional plan view of the dewatering press taken along the line 3--3 of FIG. 2;
FIG. 4 is a sectional end view through the storage carousel taken along the line 4--4 of FIG. 1;
FIG. 5 is a sectional side view through the storage carousel taken along the line 5--5 of FIG. 4;
FIG. 6 is a plan view of the incinerator rocking grates taken along the line 6--6 of FIG. 1;
FIG. 7 is an end view of the grate operating mechanism taken along the line 7--7 of FIG. 6; and
FIG. 8 is an end view of the rocking grates taken along the line 8--8 of FIG. 6.
Referring to the drawings, a conveyor 5 receives raw screenings from a conventional bar screen (not shown) and delivers the screenings into a hopper 6 mounted on a dewatering press 7. Hopper 6 may be provided with a hinged side section to allow loading of the hopper with bagged raw screenings from other screening plants.
The dewatering press 7 includes a hydraulically operated pressure gate 8 and a hydraulically operated dewatering press ram 9. Side plates 10 of press 7 are provided with a series of apertures 11 to allow removal of liquid from the screenings being pressed. This liquid falls into a chamber or gutter 12 from which it is drained back into the sewage plant.
Sprays 13 are activated when the ram 9 is moving inwardly during the pressing cycle to allow flushing water to pass over the outside of the dewatering area of apertured side plates 10 of press 7, and sprays 14 are activated when ram 9 is moving outwardly after a pressing operation to cleanse the pressed material in the press chamber.
Ram 9 is operated for a sufficient number of cycles until a wafer of pressed screenings of desired size is produced. Gate 8 is then raised and ram 9 is extended fully, pushing the wafer into a carousel loader chamber 15. Ram 9 then retracts fully, allowing pressure gate 8 to be returned to its lower operative position as shown in FIG. 2. Sprays 13 and 14 are not activated during loading of a wafer into carousel loader chamber 15.
When a sufficient number of wafers have been pushed into loader chamber 15 a carousel loader ram 16 partly extends pushing the group of wafers alon
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Futo Arpad
Warren William C.
Warren Engineering Pty. Ltd.
Yuen Henry C.
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