Steam boiler overpressure accident
1. Boiler overpressure phenomenon
(1) The steam pressure rises sharply and exceeds the permissible working pressure. The pressure of the gauge pointer exceeds the “red line†safety valve and the pressure is still rising. (2) When the overpressure interlock protection device is in operation, an overpressure alarm signal should be issued to stop the supply of air, air, and coal. (3) The steam temperature increases and the steam flow decreases.
2. Treatment of boiler overpressure
(1) Rapidly reduce the combustion and manually open the safety valve or the bleed valve. (2) Increase the water supply, and at the same time strengthen the sewage in the lower steam drum (this should pay attention to keep the normal water level of the boiler) to reduce the temperature of the boiler water, thus reducing the boiler drum pressure. (3) If the safety valve fails or all pressure gauges are damaged, the furnace should be stopped urgently, and the safety valve and pressure gauge should be repaired before being boosted. (4) When the boiler overpressures and endangers safe operation, depressurization measures should be taken, but the depressurization speed is too fast. (5) After the boiler is over-pressure-removed, it is necessary to stop the furnace for internal and external inspection of the boiler, to eliminate deformation and leakage caused by over-pressure, and to repair unqualified safety accessories.
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