Q：Under what circumstances must oil and gas boilers be shut down in an emergency?

A：
When the boiler stops running, it means the boiler is shut down. According to the operation, the boiler shutdown is divided into normal boiler shutdown and emergency boiler shutdown. When the following 7 abnormal conditions occur, the oil and gas boiler must be shut down urgently, otherwise it will cause equipment abnormalities and economic losses.

(1) When the boiler water level drops below the lowest water level line of the water level gauge, the water level cannot be seen even through the “call for water” method.
(2) When the boiler water supply is increased and the water level continues to drop.
(3) When the water supply system fails and water cannot be supplied to the boiler.
(4) When the water level gauge and safety valve fail, the safe operation of the boiler cannot be guaranteed.
(5) When the drain valve fails and the control valve is not closed tightly.
(6) When the pressure surface inside the boiler or the water wall pipe, smoke pipe, etc. bulges or breaks, or the furnace wall or front arch collapses.
(7) When the safety valve fails, the pressure gauge indicates that the boiler is operating at overpressure.

The general procedure for emergency shutdown is:

(1) Immediately stop fueling and air supply, weaken the induced draft, try to extinguish the open flame in the furnace, and stop the operation of the gas furnace with strong combustion;
(2) After extinguishing the fire, open the furnace door, ash door and flue baffle to enhance ventilation and cooling, close the main steam valve, open the air valve, safety valve and superheater trap valve, reduce the pressure of the exhaust steam, and use sewage discharge and water supply. Replace the pot water and cool the pot water to about 70°C to allow drainage.
(3) When the boiler is shut down in an emergency due to a water shortage accident, it is strictly forbidden to add water to the boiler, and it is not allowed to open the air valve and safety valve to quickly reduce the pressure to prevent the boiler from being subject to sudden changes in temperature and pressure and causing the accident to expand.

The above is some little knowledge about the emergency shutdown of steam boilers. When encountering a similar situation, you can follow this operation. If there are other things you want to know about steam boilers, you are welcome to consult Nobeth customer service staff, we will wholeheartedly Answer your questions.