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Checking, Maintenance and Regular Work During Operation of Boiler

Monitoring in the control room : 

1. Check that the smoke temperature at inlet of the cyclone separator does exceed 1050 ℃, the super-high temperature smoke can burn out the refractory or the metal pressure parts. 

2. Check whether the thermocouple in bed temperature and related instrument are in normal working condition or not. 

3. Check whether the fluidization air volume is normal or not, in order to ensure the normal distribution of primary air and secondary air flow. 

4. Check whether the oxygen percentage in flue gas is normal or not, in rated load operation, the oxygen percentage shall be > 4%, at the same time the normal operation of the oxygen gauge shall be ensured. 

5. Check the  differential pressure of the material layer, verify the pressure measuring point, and check  the pressure pipeline is blocked or not in order to ensure that the indication of differential pressure of material layer is normal. 

6. Monitor whether the operation of slag-discharging system is normal or not and monitor and confirm that the water-backing temperature of slag-cooling water is < 100 ℃. 

7. Check whether the steam drum water level is normal or not frequently through the comparison of water level monitoring television and local water level, in necessary, flush the water level gauge. 

8.  Put the ash blowing system into use on a regular basis. When the boiler is in normal operation, if the outlet smoke temperature of the boiler is too high, ash shall be blown. 

Checking outside the control room: 

1. During the operation of the boiler, the equipment shall be carefully checked according to route, time and project. 

2. Check whether the combustion working condition is stable, the fluidization is normal and flame is wheat yellow or not. 

3. Listen carefully to the noise of the superheater, economizer and boiler to confirm it is normal voice, and check whether there is leakage. 

4. Check the steam drum water level gauge is clear, has no leakage, and water level has slight fluctuations, and each meter indication is correct. 

5. Each manhole door, fire-observation hole and inspection hole are complete and not damaged; and there is sundry around. 

6. The steam, water pipelines and  header shall have no leakage and vibration. The support frame shall be firm and in good thermal insulation. 

7. The valve and switch shall be correct in position and have no leakage. The driving gear shall be  good, and the pull rod shall no bending phenomenon. 

8. The separator is normal, the returns ash is not jammed. Inside the returning device, a certain material level is kept, and there is no air leakage and ash leakage  phenomenon. 

9. The rotating machine shall run normally, the cooling water flows smoothly, the oil quality and oil level is normal. There is no oil shedding, oil leakage and oil permeation phenomenon. 

10. The coal feeder is running well, the coal conveying is normal and the coal -drop pipe  is unimpeded. 

11. Check whether the compressed air system is operating normally and the air pressure is qualified. 

12.  Check whether ESP and bag filter, ash conveying system and equipment operate normally. 

13. Check whether the oil depot has oil spilling, oil bleeding, oil dripping and oil leakage phenomenon, and whether the air in the pump house is fresh or not, otherwise the pump house shall be ventilated. 

Working on a regular basis: 

1. Check the auxiliary machine once every 2 hours. 

2. Read the operation parameters once every hour. 

3. Compare the local water level once every 4 hours.  

4. Drain the water from the air tank once every 2 hours.

5. Verify the main steam parameters of the boiler turbine once per shift. 

6. Check the main steam pressure gauge once per shift. 

7. Drain the ash from the air chamber when the returns is loosen at early shift per day. 

9. Blowdown once regularly at middle shift per day. (according to blowdown amount informed by the laboratory personnel) 

10. Clean the slag trench twice per shift. 

11. Fill the oil to the slag-conveying machine at the first early shift of every day. 

12. Flush the local water level at the first early shift every day. 

13. Test the alarm of steam drum water level once every two weeks. 

14. Test the gas exhausting of the safety valve once every three months. 

15.Fill the oil to the valve  once every three months. 

16. Inform the chemical person for assaying the auxiliary bearing and coupling once every three months. 

17. Check the air leakage once every six months. 

18. Clean the filter screen of the air compressor once at the first shift every day.  


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