The Medical Waste Disposal
Incinerator units shall be of Dual or Multiple Chamber type that
thermally degrades combustible medical wastes of varying heat content
using a two-stage or multiple stages combustion processes. That is first
stage of thermal waste degradation in the primary chamber and second
stage of smoke burning (flue gas treatment) in the secondary chamber.
The waste burning process per cycle shall be fully automatic from start
to finish. The waste incinerator unit shall consist of a primary
chamber, secondary chamber, stack, combustion air blower, burners and
controls as the main components.
Waste Incinerator Capacity
The waste incinerator units
shall be designed to burn medical waste load of capacity 50 kg/hr with
calorific values ranging from 2,300 kJ/kg to 30,000 kJ/kg at a designed
thermal rate of 1,440,000 kJ/hr.
Method of Waste Charging
Waste shall be fed into the
primary chamber manually, that is by hand. Semi-automatic or automatic
feeding systems are not required.
Method of Burning
The primary and secondary
burners shall be equipped with at least one fuel oil burner each. Waste
shall be manually fed into primary chamber and heated to required
ignition temperature of at least 600 degree Celsius. A controlled amount
of air shall be admitted by combustion air blower to maintain the
necessary reaction heat required for thermal degradation of waste.
Smoke, ashes, volatile gases, etc generated from the primary chamber
shall be effectively and efficiently ignited in the secondary chamber.
Emission through the stack shall be within environmental standards.
The internal lining for
combustion chambers shall be made up of pre-determined thickness and
high temperature stability insulation, high strength firebricks and
castible refractory. The temperature rating for refractory shall be at
least 1,500 degree Celsius. The casing of the chamber shall be
constructed from high grade mild steel plate. Lifting devices such as
eye bolts and lifting lugs shall be fitted as standard.
The doors shall be hinged on the
right hand side and can be easily opened and closed. All doors shall be
manually operated. Incinerator shall NOT incorporate automatic doors.
All doors should be internally lined with pre-determined thickness
insulation and refractory cement.
The stack shall be fabricated
from pre-determined thickness stainless steel plate suitably flanged for
Combustion Air Blower
A combustion air blower shall be
of steel construction type with built-in air damper regulation shall be
provided. The impeller shall be of the radial blade design and all
rotating elements shall be dynamically balanced.
Burners fitted shall be of
packaged fuel oil fired types. Primary chamber shall be fitted with an
on/off type burner while the secondary chamber shall be fitted with a
high/low type burner. The burners shall each have a maximum rating
A control system shall be
provided to control all functions of the primary and secondary chambers
including combustion air distribution and burner control. It shall
comprise of PLC, temperature controllers, timers, relays and switches to
provide automatic operation of the entire system. All switches and
controls shall be mounted in an IP 55 rated control panel.
The incinerators shall have a
power supply of 240/415 volts, 50 Hz AC. All electrical works shall
conform to SAA Wiring Rules SA 3000 and be subject to PNG Power
All equipment shall be painted
with a coat of zinc rich primer and two coats of high temperature heat
resistant polyurethane type paint. All painted surfaces shall be
prepared by either steel shot cleaning or sand blasting.
Identification and Name Plates
Identification and name plates
containing the manufacturer’s name, model number, serial number, and
other pertinent information shall be securely fastened to the unit in
readily visible locations.
Fuel Type and Tank
All burners shall be fuel oil
(diesel) fired. For all incinerators fitted with fuel oil (diesel) type
burners, the bidder shall supply and install 1000 litres steel tank and
all the necessary piping and fittings and initial supply of 1000 litres
fuel oil. Where existing fuel is found to be still in good condition
from site inspection, contractors must use existing tanks and therefore
must clearly specify in their bids of such usage. The tank shall be
positioned at least 2 meters above ground on steel frame next to the
incinerator shed. Fuel delivery to incinerator burners shall be by
gravity feed. The tank should be fitted with a drain plug as standard.