I believe many friends know that the boiler before ignition, usually to start the induced draft fan, forced draft fan, maintain the rated air volume of 10% - 25%, ventilation for 5 minutes. Why should the boiler be ventilated? Now let's take you to know Qingdao boiler Importance of ventilation and purging before start-up:
1. This idea is to prevent combustible gas or pulverized coal remaining in the furnace after the last shutdown, or leakage of combustible gas or pulverized coal into the furnace due to loose fuel system during shutdown.
2. When the boiler is ignited, if the concentration of combustible gas or pulverized coal is within the explosion limit, it will easily cause furnace explosion, damage the furnace wall, and even cause personal injury and death.
3. Although it is difficult to remove all the remaining combustible gas by ventilation with large air volume, it can dilute the concentration of combustible gas or pulverized coal in the furnace to far less than the lower limit of explosion limit, so as to ensure the safety of equipment and personnel during boiler ignition.
Finally, I would like to remind you that after the ventilation of Qingdao boiler, ignition should be carried out as soon as possible, so as to avoid leakage of fuel system, resulting in the concentration of combustible gas or pulverized coal rising to the explosion range again.