Explosion-proof doors, also known as blast-resistant doors or armored doors, are special protective devices used to withstand the shock waves of explosions. They are mainly used in high-risk fields such as power, chemical, and petroleum industries. They are made of boiler steel plates, armor steel plates, or special industrial steel plates, with door frames welded from channel steel. Equipped with explosion-proof top and bottom handwheel locks and rock wool filling material, they have a sealing and isolation function, preventing the spread of explosion hazards and ensuring the safety of the building's interior.
Based on their structure, these devices are divided into swing-type and rupture-diaphragm type: swing-type doors are made of cast iron, with the door cover coated with heat-resistant concrete, and can automatically reset; they are mostly installed on the furnace walls of the combustion chamber. Rupture-diaphragm type doors use asbestos cement board or metal materials as the core and are usually installed in the flue. Explosion-proof doors withstand shock wave pressure ranging from 0.021 MPa to 0.19 MPa, and are classified into levels I-IV according to the degree of damage. Deformation is allowed when the preset pressure is exceeded, but the component function is maintained. Installation requires placement in economizer flues, before and after induced draft fans, etc., and is equipped with pressure relief guide pipes. Regular manual inspection is necessary to prevent rusting. The door hinges are lined with bronze bushings and have rubber pads around them to prevent friction sparks, and they also have a self-closing system and emergency escape function.
