The Incinerator units shall be designed to last in operation in a tropical environment for a minimum period of 10 years if the specified maintenance schedule is followed. All metal surfaces (except combustion chamber internal fittings) shall be either galvanized, enameled, painted or otherwise treated against atmospheric and process induced corrosion,Medical waste management pdf.
The incinerator combustion chamber(s) should be designed for easy maintenance of all internal parts including the refractory and insulation. Materials used in the individual parts of the incinerator shall be heat resistance and also be protected against oxidation, corrosion, etc.
The incinerator shell shall be made of mild steel with an adequate thickness for small units of between 3-6mm and larger units 5-10 mm depending on the construction part and painted externally with heat resistant aluminum paint suitable to withstand 250° C. The outside surface temperature of the incinerator casing should not exceed 50° C above ambient temperature and shall include a safety mesh around all hot surfaces. Cold face refractory lining of calcium silicate or superior material, minimum thickness 100 mm.
All incinerators shall meet the following emission and operating standards:
• Combustion efficiency (C.E.) shall be at least 99.0%
• The combustion efficiency shall be computed as follows:
o C.E = (CO2 X 100) / (%CO2 +%CO)
Suitably designed pollution control devices such as scrubbers, filters or electrostatic precipitators, shall be installed/retrofitted with the incinerator to achieve emission limits.”
“Each unit shall include a complete vertical exhaust and stack system, including the following features:
• Steel construction.
• Refractory lining in the lower section.
• The exit height of the stack shall be not less than a range of 3-12 metres above ground level depending on the capacity of the incinerator unit.
• The diameter of the stack shall be selected by the Contractor to deliver an exhaust exit velocity of not less than 10 metres per second vertically upwards when at full scale operation.
• An emission stack sampling port shall be included immediately above the secondary chamber.