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09 April 2020

144.Incinerator firing procedure

April 09, 2020 Posted by AK No comments
Preparation

1. Drain the layered water from waste oil (sludge) in the tank before burning. Contamination in oil may cause some clog or trouble to valves and pumps. They may also cause a bad combustion; black smoking and sticking of soot or un burned oil to the furnace wall.
2. Heat waste oil (sludge) before and while burning. Hot waste oil (sludge) can get easy to transport and to atomize into fine mist. It cannot be burnt below its flash point.
The proper oil temperature at the burner is 90-100 ℃, but the temperature may need to be re-adjusted according to the oil characteristics. Heating-up the waist oil will decrease the water content.
Make sure the tank is properly ventilated so there is no leakage of gas generated by the heating-up.
If there is any volatile components in the waist oil, ventilation of the tank and leakage from piping must be given care.
3. Agitate waste oil (sludge) before and while burning. A continuous agitation assists to emulsify the oil and water into an emulsion mixture for fine atomizing.
4. If the exhaust gas duct has a damper, fully open it for ventilation.
5. Set the valves for running. Confirm that the return oil line to the tank will not be blocked
during operation.
6. Make sure the strainers are clean.
7. Make sure there is no leakage in each piping lines.
8. Make sure powers and pneumatic air supply to the unit is sufficient.
9. Make sure no ash and ember is in the furnace.
10. Solid wastes can be charged through the single door before running. Close and bolt the
door steadily after every charging.
11. Set the burner, the charging doors and others to their running positions.
12. Check tensions of the driving belts.
13. Take a precaution to the ambient condition against moving parts, a high voltage, a high
temperature, and so on. before the incinerator is put into operation.
14. Check if fittings, wiring and settings of devices for safety and control are tight, steady
and correct with no soil.
15. Make sure the arrangement of the atomizer and the electrodes of the ignition burner.
16. Set all the switch on the control panel to correct set position.

Warming up stage.

1. Preset switches for a start.
Turn "W.O. TEMP. DETECT" switch to "CANCEL".
( By production time. "FUEL FOR MAIN BNR." switch to "D.O." )
Turn "DILUTION " switch to "AUT0.". (in case of automatic dilution control)
Turn "MAIN BURNER " and "IGNITOR " switches to "ON ".
2. Close the furnace air damper and open the dilution damper to decrease air into the combustion
chamber, then the warming up will be quickened. Narrowing the gap of the burner air damper
may effect better. The dilution damper will be automatically operated as described below
in case of automatic dilution control. (See the section of adjusting of dampers.)
3. Set valves for warming up by diesel oil. (See item B.2.8. and B.2.9.)
4. Turn "RUNNING " switch to "START ", and the exhaust fan and the main burner will be driven.
The pump assembled in the main burner is also driven.
5. The dilution damper will automatically open to quicken warming up of the furnace in case
of automatic dilution control.
6. After a proper purging, the ignition burner will be supplied with diesel oil to atomize
while the electrodes give a spark to the oil mist at the same time.
7. The main burner will be supplied with diesel oil to burn in 10 seconds.
8. The ignition burner will stop in 10 seconds.
The fluid to the atomizer of the ignitor will be replaced with air by the atomizer cooling valve
while the ignitor stopping in order to protect the atomizer from heat in a hot furnace.


Waste oil (sludge) burning stage

1. Waste oil (sludge) is interlocked to shut off with a lower temperature than the low limit
point in the combustion chamber.
(See the chart of temperature and the table of control/safety.)
Set valves for the wasted oil combustion after the display of the in-furnace temperature controller becomes over 650℃.
2. Change "W.O. TEMP. DETECT" switch to "ACTIVE " after "W.O. BURNING POSSIBLE " lamp lights. ( By production time. "FUEL FOR MAIN BNR." Switch to "W.O." )
3. Adjust the burning rate and the dampers’ opening so that the temperature is settled at about
1050 ℃ after the chamber is warmed. If manual dilution control is done, close the dilution
damper to control the temperature rising of the combustion chamber. Adjust the burner air
damper depending on the burning rate of oil. Adjust the furnace air damper depending on the burning condition of solid wastes.
4. When the chamber is heated up to the upper set point (1,100℃), fuels will be automatically
shut off. When it is cooled back to the lower set point (1,000℃), the ignitor will start again.
5. When the exhaust gas is heated up to the upper set point (320℃), fuels will be automatically
shut off. When it is cooled back to the lower set point (310℃), the ignitor will start again.
6. A purging will automatically be carried out for 30 seconds or longer after every shut off
of the fuel.

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