Compared with the normal shutdown, the emergency shutdown of industrial steam boilers indicates that the boiler has an abnormal situation. If it is not immediately stopped, it may cause certain economic losses. Therefore, in the following situations, you should immediately pay attention to the emergency shutdown operation.
(1) When the water level of the industrial steam boiler drops below the minimum water level line of the water level gauge, the water level cannot be seen through the "calling water" method.
(2) When the water level of the boiler make-up water is still increasing.
(3) When the water supply system fails to supply water to the boiler.
(4) When the water level gauge and the safety valve fail to ensure the safe operation of the boiler.
(5) When the blowdown valve fails and the control valve is not tightly closed.
(6) When the pressure surface or water-cooled wall pipe, smoke pipe, etc. in the boiler are bulging or cracked, the furnace wall and front arch collapse.
(7) In the case of failure of the safety valve, the pressure gauge indicates that the boiler is operating under overpressure.
The general procedure for emergency shutdown of industrial steam boilers is: immediately stop adding fuel and air supply, weaken the induced air, try to extinguish the open flame in the furnace, stop the burner operation of the oil and gas stove; open the furnace door, ash door and flue after fire extinguishing Baffle to enhance ventilation and cooling; close the main steam valve, open the air valve, safety valve and superheater trap, exhaust steam and reduce pressure; replace the pot water by draining and adding water, the pot water is cooled to about 70 ° C to allow drainage. However, during an emergency shutdown due to a water shortage accident, it is strictly forbidden to supply water to the boiler, and the air valve and safety valve must not be opened to reduce the pressure quickly to prevent the boiler from being exposed to sudden changes in temperature and pressure, which will cause the accident to expand.
The above are the reasons and steps I made for everyone about the emergency shutdown of industrial steam boilers. I hope it will be helpful to everyone.
