1. SCOPE OF WORK The work specified in the contract will include.
1. Supply, install and commission an incinerator as provided in the technical specifications
2. Provision for adherence to OSHA and other statutory requirement relating to Health and Safety of workers during execution of the works covered in this tender.
3. Assessment and preparation and construction of a standard incinerator shed with one waste storage room ( see the design )
4. Provision of operation and maintenance manuals and drawings complete with maintenance schedule and instructions.
5. Fuel oil storage tank- Mild steel1500 liters capacity
6. Onsite training for operation and maintenance staff.
incinerator manufacturers To enable the Employer undertake conclusive evaluation of the tender, tenderers are requested to submit with their offers the detailed specifications, drawings and catalogues with commissioning and maintenance instructions for the Incinerator they intend to supply, install and commission. Tenderers who fail to comply with this requirement fully shall have their tenders rejected. 2. TECHNICAL SPECIFICATIONS OF THE REQUIRED INCINERATOR
2.1 General Description
The plant must have four distinct sections that demonstrate three principles of turbulence, residence time and temperature retention. The regulated sections may include but not limited to:
1. Overall plant layout
2. Feed chamber/charging
3. Primary combustion chamber
4. Particulate scrubbers
5. Acid gas scrubbers.
6. The stack/chimney.
7. Minimum capacity of primary chamber = 0.18 cubic metres
8. Burn rate (rate of waste incineration) = a least 20 kg per hour
9. Should have a full width counterbalance loading door allowing easy access to the main chamber for loading and removing ash.
Supply, Installation and Commissioning of An Incinerator in Eastern Hydros [ Page 28
2.2 Feeding and Charging
Controlled hygienic mechanical feeding that does not negatively influence the air temperature in the primary and secondary chambers of the incinerator shall be used.
2.3 Primary Combustion Chamber.
a) This chamber should be equipped with burners that use low sulphur fuel.
b) The chamber should ensure a minimum exit temperature of 850 degrees centigrade.
2.4 Secondary Combustion Chamber (After burner)
a) Should be fitted with burners that use low sulphur fuel.
b) Ensure secondary air supply is controlled.
c) Ensure residence time is not less than two seconds.
d) Ensure that the gas temperature as measured against the inside wall in the secondary chamber and not in the flame zone is not less than 1100 degrees centigrade.
e) Ensure the emitted oxygen content of the emitted gases is not less than 11%
f) Ensure both primary and secondary combustion temperatures are maintained until all waste is completely combusted.
2.5 Particulate Removers
A mechanical particulate collector must be incorporated after secondary combustion chamber for removal of particulate pollutants entrained in the flue gas stream. The particulate collectors may include any of the following or a combination thereof:
a) Cyclone separator
b) Electrostatic precipitators
c) Fabric filters
l) The chimney should have a minimum height of 10 metres above ground level and clear the highest point of the building by not less than 3 metres for all roofs. The topography and height of adjacent buildings within 50 metres radius should be taken into account.
m) The chimney should be visible to the operator from the feeding area.
n) The minimum exit velocity should be 10 metres per second and at least twice the surrounding wind speed (Efflux velocity = wind speed x 2) whichever is higher to ensure no down washing of exiting gases.
o) The point for measurement of emissions shall be provided.
a) Instrument for determining the inside wall temperature and not burner flame temperature must be provided for both primary and secondary chambers.
b) An audible and visible alarm must be installed to warn the operator when the secondary chamber temperature drops to below the required temperature.
c) A carbon monoxide and oxygen meter/recorder should be provided
d) A smoke density meter/recorder should be provided.
e) A solid particulate meter/recorder should be provided.
f) Any other instrument that may be considered necessary.
2.9 Emission Limits
a) Combustion efficiency (C.E) shall be at least 99.00% where C.E = %Carbon dioxide x 100 / [% Carbon dioxide + carbon monoxide]
b) The temperature of the primary chamber shall be 800 +/- 50 degrees centigrade
c) The secondary chamber gas residence time shall be at least 1 second at 1050 +/- 50 degrees centigrade with 3% oxygen in the stack gas.
d) Opacity of the smoke must not exceed 20% viewed from 50 metres with naked eyes.
e) All the emission to the air other than steam or water vapour must be odourless and free of mist, fume and droplets.
f) A 99.99% destruction and removal efficiency (DRE) for each principal organic hazardous constituent (POHC) in the waste feed where DRE [ ( Win – Wout) /Win ] x 100 where Win = mass feed rate of the POHC in the waste stream fed to incinerator and Wout = mass emission rate of POHC in the stack prior to the release to the atmosphere.
g) The average dioxin and furan concentration in the emission should not exceed 80mg/m3 total dioxins and furans if measured for a period of 6 to 16 hours.
– Manual technical monitoring is shipped with the hardware with all explanations of failures and resolutions
Capacity/island : 4000 kg/day ; 25000 kg/day ; 31000 kg/day ; 48000 kg/day
Burning temperature – over 12000C
Two chambers – minimum
Emissions – dioxin and heavy metaly – better then Kyoto protocol
Emission – monitoring system
Waste unloiding – directly from waste track to incinerator