Guide: As the main heat source, industrial boilers are used in a variety of industrial production, and can be used for drying, sterilization, disinfection, pulping, printing and dyeing and other purposes, and its role is very important. The operational stability of industrial boilers is very important. What are the reasons for fire extinguishing during boiler operation? Why install boiler fire protection device?
As the main heat source, industrial boilers are used in a variety of industrial production, and can be used for drying, sterilization, disinfection, pulping, printing and dyeing and other purposes, and its role is very important. The operational stability of industrial boilers is very important. What are the reasons for fire extinguishing during boiler operation? Why install boiler fire protection device?
1. Reasons for extinguishing fire in industrial boilers
1. The boiler load is too low;
2. Improper combustion adjustment, excessive negative pressure in the furnace, and low furnace temperature;
3. The powder feeding is interrupted, the speed is too low, the powder level is too low, and the powder feeding is uneven. The coal quality is poor, the coal powder is too coarse, the primary air pressure changes too much, or the primary air duct is blocked;
4, improper operation or misoperation when switching the fan system;
5. Improper ash removal operation, a large amount of cold air in the furnace;
6. The furnace tube was severely blasted;
7, the factory power is interrupted or the suction fan, blower, powder exhauster, and powder feeder trip in operation;
8. Increase or decrease the load operation too fast;
2. Fire extinguishing phenomenon in industrial boilers
1. The negative pressure in the furnace increases significantly;
2. The furnace is dark and no flames can be seen;
3. The steam flow, steam temperature, and steam pressure decrease, and the water level first decreases and then increases;
4, the primary and secondary wind pressure becomes smaller;
3. boiler fire extinguishing methods
1. Immediately stop all pulverizers, turn off the high and coke oven gas and water seal, stop supplying fuel to the combustion chamber, and stop the operation of the pulverizing system;
2. Close the primary and secondary air doors, reduce the air supply and suction volume, adjust the blower baffle, maintain the negative pressure in the furnace, and ventilate for 5 minutes to remove combustibles in the furnace and flue;
3. Disconnect the desuperheater and open the superheater drain gate according to the drop in steam temperature;
4. Find out the cause and prepare for re-ignition;
5. After the boiler is extinguished, if the fuel is exploded in the combustion chamber or flue due to continued fuel supply or improper handling, it is necessary to immediately stop the supply of fuel and air, stop the blower and suction fans, and close the baffle to resume being opened. For explosion-proof doors and other manhole doors, after confirming that there is no fire source in the furnace and flue, start the suction fan to pump for 5 to 10 minutes, and confirm that there is no residual fuel before ignition;
4. why the boiler should install a boiler fire protection device
When the boiler is in operation, due to low boiler load, lower fuel quality, sudden increase in air volume, and improper operation, it is easy to cause the boiler to extinguish fires. Fire extinguishing not only has the risk of load rejection and "fire" in the furnace, but also the danger of high-pressure water rushing into the steam turbine for the once-through boiler.
Because the boiler often only takes tens of seconds, or even only a dozen seconds, from the fire extinguishing to the firing of the gun. In such a short time, it is quite difficult for the operators to make correct judgments and deal with them in time. Therefore, the boiler combustion system must be installed. Reliable fire protection device.
The above has introduced the reasons for the fire extinguishing of industrial boilers and the reasons for installing boiler fire extinguishing protection devices. Xinli Boiler has been committed to the research and production of industrial gas boilers for many years, has rich experience in production and service, and can customize boiler selection and design schemes for the majority of users. Welcome to consult.