UNUSED MEDICAL & WASTE INCINERATOR
Hazardous Waste / Non-Hazardous Waste / Hospital Waste
Capacity 50 - 200* Tons per day*
50/60 Cycle Result Equals a Roughly 10% Difference in Speed
(* By Modification)
DESCRIPTION OF THE SYSTEM
ROTARY KILN: The Primary Combustion Chamber of the incinerator is a rotary kiln, 12' diameter x 20' long, designed to have a nominal capacity of 50 Tons per 24 hours and an approximate heat release of 20 MM BTU/hour. The primary combustion chamber is followed by a Secondary Combustion Chamber, equipped with a 5 MM BTU/hour supplementary oil burner.
This facility has been operated only for a short test conducted after completion of construction.
The incinerator air pollution control equipment were tested for:
1. Particulate removal efficiency
2. Halogen removal efficiency
3. Destruction and removal efficiency
This system passed all tests.
The high temperature thermal processing facility design is comprised of a building housing front end handling equipment which allows discharge of received materials to be disposed of into an enclosed dual push-pit with a single ram feeder. Materials (contaminated hospital wastes and empty pesticide containers) are fed by a metering conveyor and furnace feeder into a rotary kiln combustion chamber designed to burn at 2600° F. Combusted inert ash is dropped into a quench tank from whence it is removed by a drag conveyor. Spent gases are routed through an after burner section where it is retained for at least two seconds above 2200° F which breaks down the toxic chemicals. Gas cleaning is provided by passing them through a quench tower, venturi scrubber, demister, packed tower, and a plume eliminator such that a clean invisible emission goes up the stack. Scrubber water is chemically neutralized before injection into the sanitary tower.
Method of Operation
Toxic materials (delivered in packer trucks) and contaminated hospital wastes (delivered in containers) are received at the upper level where they are deposited into enclosed waste pits. Empty 30 gallon and 55 gallon containers are also delivered at the upper level where a fork truck mounted drum handler feeds them into a shredder where they are shredded and discharged directly into the enclosed toxic waste pit.
Feeding of materials into the incinerator is controlled by the plant operator from the control room. Hospital wastes and toxic wastes are mixed by pushing materials from the pits into the hopper of the ram feeder by activation of hydraulically operated pit rams. The percentage of hospital waste fed is determined from the nature of the materials in the toxic waste pit (i.e. high non-combustible content/low percentage of toxic waste).
It should be noted that all waste materials are enclosed from the time they are received until injected into the incinerator. Likewise a portion of the combustion air is drawn from the feed enclosure thus keeping it at a slight “negative” pressure further assuring safety to operating personnel from possible toxic dust particles.
Materials are then pushed from the ram feeder onto the incinerator feed conveyor and then at an adjustable rate into the incinerator feed ram hopper. Incinerator feed is then accomplished by opening the fire door and injecting the material from the ram hopper into the rotary kiln.
Provisions for handling limited quantities of bulk waste pesticides on an occasional basis are included in the upper level. Drums or other containers full of waste bulk pesticide are delivered to the drum processing room. The materials must then be positively identified and an acceptable disposal rate is determined. Liquid materials are dumped into a tank from whence it is pumped at an adjustable controlled rate to the incinerator feeder for injection into the kiln. Powdered or soluble palletized or crystal materials are dumped into a receiving chamber and then are conveyed into a mixing chamber where they are mixed with liquid into a slurry. The slurry is then pumped at an adjustable controlled rate to the incinerator feeder as above.
Materials in the rotary kiln are combusted at a controlled 2600° F combustion temperature to assure complete destruction of the toxic elements and reduction of the non-combustibles to a sterile slagged ash. Temperature control is maintained by adjusting the rate of waste fed into the kiln, the rate of fuel burned in the supplemental burner, and the amount of air drawn through the kiln. Dwell time of solids within the kiln is controlled by adjusting speed of kiln rotation.
Combustion gases at 2600° F are introduced into the afterburner which is sized to provide at least two seconds dwell time in the afterburner section thus thermally destroying all toxic elements. Gases leave the afterburner at approximately 2250° F with no supplemental fuel required. An oil or gas fired auxiliary burner which is used to preheat the afterburner could elevate this temperature if required.
Normal operation, while thermally destroying toxic wastes, routes the products of combustion into the scrubber system. Gases are first tempered by a water spray in the pre-cooler before being introduced into the plume eliminator at approximately 1400° F. These gases then are cooled to approximately 1250° F as the gases from the induced draft fan are heated from approximately 185° F to approximately 300° F. Caustic solution is added to the cooling water at this point to adjust the pH of the water entering the variable throat high energy venturi.
Supersaturated gases and surplus liquid at approximately 185° F then pass through the demister where the gas stream is stripped of excess water droplets. Scrubber water containing any remaining organic matter or fly ash is collected in the demister sump and is bled off for disposal.
Saturated gases at approximately 185° F then enter the packed tower where water sprays and packing remove at least 99% of the halides from the gas stream
Clean gases are then drawn through the induced draft fan and injected into the plume eliminator where they are reheated to approximately 300° F and exhausted up the stack.
Alternate operation while not burning toxic wastes does not require use of the scrubber system.
The INCINERATOR SYSTEM is comprised of the following:
· 25 Million BTU/hr. Rotary Kiln Incinerator and Secondary Combustion Chamber
· VENTURI Scrubber
· Packed Tower and Plume Eliminator Air Pollution Control System and Auxiliary Equipment.
· Instrumentation and Controls
1. Ram Feeder with Guillotine
2. Rotary Kiln 12' Diameter x 20' Long
3. Secondary Combustion Chamber - 9'11" I.D. Refractory x 27' Long.
4. #2 Fuel Oil Burners with Propane Pilots with Combustion Air Blowers and Burner Monitor Panels for Fail-Safe operation
a. ROTARY KILN BURNER: 20,000,000 BTU/Hour - North American
b. SECONDARY COMBUSTION CHAMBER: 5,000,000 BTU/Hour - North American
c. Burner Systems and Controls, Fuel Oil Pumps, Piping, Valves, etc.
5. Control Panel with Controllers:
a. Temperature Records
b. Temperature Indicating Controllers
c. Differential Gauge for Absorption Tower Pressure Drop
d. Liquid Level Controller for Surge Tank Level Control
Click items below for additional information:
Facility Operation Management - PDF file
Re-Assembly Sketches - PDF file
Call (718) 492-7400 for Details!
ALL INFORMATION AND SPECIFICATIONS
IS SUBJECT TO A BUYERS REVIEW AND CONFIRMATION
THE EQUIPMENT IS BEING OFFERED AND SOLD FOR THE ACCOUNT
OF THE OWNER
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