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What are the reasons for the sudden decrease in boiler load? How to handle it?
What are the reasons for the sudden decrease in boiler load? How to handle it?
1、 Phenomenon:
1. The steam flow rate drops sharply and the steam pressure rises sharply.
If not detected and handled in a timely manner, it will cause the boiler safety door to operate.
3. If the boiler water level drops instantaneously and rises again, the high water level signal will sound an alarm. When the safety door is reseated, the water level drops rapidly, which may cause a low water level signal alarm.
If the power supply switch trips, the auxiliary current meter will swing abnormally and the lighting will flash.
2、 Reason:
1. The external switch trips.
2. Emergency shutdown of the steam turbine.
3. The valve core of the isolation valve or main valve is detached.
3、 Handling:
According to the instructions on the steam packaging water level gauge and steam and feedwater flow rate gauge, change the feedwater from automatic to manual and adjust the water level in a timely manner.
2. According to the decrease in load and the increase in steam pressure, timely close the small air intake and supply volume, stop the grate, keep the boiler running, and open the superheater for drainage.
3. Adjust the cooling water valve in a timely manner to ensure normal steam temperature.
If it is found that the handling is not timely and the pressure exceeds the operating pressure of the safety door, but the safety door does not operate, the electric exhaust valve should be opened until the pressure is normal.
5. Prepare for load connection and report to the person in charge.
6. After the accident, check whether the safety door is tightly closed.Author：Ebico