What is the reason for the sudden reduction of boiler load? How to deal with it?
1、 Phenomenon:
1. The steam flow drops sharply and the steam pressure rises sharply.
2. If it is not found and handled in time, it will cause the boiler safety valve to act.
3. The boiler water level will rise again after the instantaneous drop, and the high water level signal will alarm. When the safety valve is reseated, the water level drops rapidly, which may cause the low water level signal alarm.
4. If the power transmission switch trips, the ammeter of the auxiliary machine will swing abnormally and the lighting will flash.
2、 Reason:
1. The external line switch trips.
2. Emergency shutdown of steam turbine.
3. The valve core of the isolation valve or main valve falls off.
3、 Handling:
1. According to the instructions of the steam package water level meter and the steam and feedwater flow meter, change the automatic water supply to manual, and adjust the water level in time.
2. According to the load drop and steam pressure rise, close the small induced air volume and supply air volume in time, stop the grate, keep the boiler on fire, and open the superheater for drainage.
3. Adjust the desuperheating water valve in time to make the steam temperature normal.
4. If it is found that the treatment is not timely and the pressure exceeds the operating pressure of the safety valve, but the safety valve does not operate, open the electric valve of the fire exhaust until the pressure is normal.
5. Prepare for loading and report to the person in charge.
6. After the accident, check whether the safety door is closed tightly.