Dust** has always been one of the catastrophic accidents that are difficult to prevent and control in the field of industrial production, especially in August 20142. Kunshan extraordinarily large dust ** accident, and 2015 Taiwan 627 Eight Immortals Paradise color dust deflagration accident once again aroused the vigilance of the whole society to the hazards of dust, the frequent occurrence of these industrial accidents, exposed the problems in the field of production prominent, the situation is grim, but also exposed the lack of awareness and knowledge of relevant practitioners in accident protection.
Therefore, timely and effective monitoring of the dust concentration in the workplace can better grasp the operation status of the equipment, and effectively remove dust and reduce dust, which plays an extremely important role in ensuring human life and improving environmental quality.
Flameless venting device vents can be installed on the side or top of the dust collector (depending on the organization of the dust collector). -Be sure to pay attention to the dust collector filter element will endanger the accident and will prevent the explosion venting of the explosion venting plate!)
A common incorrect problem is the layout of flameless venting devices. When an accident occurs, the explosion vent is opened, the pressure wave is dynamic, the pressure wave blows the filter element or dust removal bag to the interface of the explosion vent, the filter element or dust removal bag blocks the explosion venting piece, and the explosion venting plate is not efficient, and the explosion venting pressure in the dust collector increases, which exceeds the explosion venting pressure value (pred) of the design scheme of the dust collector, and the dust collector shell is deformed and cracked.
Dust requires five elements, and when these five elements exist at the same time, there is a possibility of occurrence. Dust**Dust** is accompanied by a strong shock wave and flame, because the equipment does not have such a large pressure resistance, the equipment will be damaged when it is generated, and then produce secondary or multiple hazards. Therefore, we are required to pay attention to dust protection.
There are three main ways of dust explosion prevention: explosion venting, explosion isolation and explosion suppression.
Explosion venting: The ** will be released in advance through a pressure relief device to protect the equipment from damage.
Flameproof: Through a flameproof valve, the flame will be blocked to prevent the flame from spreading.
Explosion suppression: first detect the sparks detected by the device, and then feedback to open the fire extinguishing device, instantly extinguish the fire to prevent the generation of **.
When the dust collector is located in the room, the pressure must be directed to the outdoor area according to the pressure relief hose to carry out the explosion venting. When selecting the explosion relief hose, the design scheme and layout should be carried out in accordance with the relevant specifications for the length of the pressure relief hose, the angle of the pressure relief hose, the specifications of the pressure relief pipeline, and the explosion pressure when there is a pressure relief hose. When the flameless explosion venting device explosion venting standard does not allow, flameless venting equipment or explosionsuppression technology and mechanical equipment should be selected.
The magnitude of the load does not change when the valve is opened and closed, so the force transmitted from the valve stem is basically constant, and its disadvantage is that it is more vibrating. And the return performance is poor, the valve of this structure can only be used on fixed equipment, and the mass of the hammer should generally not exceed 60kg, so as not to operate difficult. Cast iron hammer valves are suitable for nominal pressure pn
100 help plan
Flameless explosion venting valves are widely used in grain, metallurgy, chemical industry, electric power, light industry, pharmaceutical, mechanical processing, solid waste treatment and other industries. The equipment used is cyclone separators, bag filters, dust collectors, cartridge filters, pneumatic conveying, rod or ball mills, bucket elevators, drying and drying ovens, roll grinding, buildings, etc. The device is mainly composed of a storm vent plate and a flame extinguishing net, the device is installed on the protected equipment, during normal operation, the storm vent plate is in a closed state, once the dust storm explosion occurs in the device, the overpressure of the storm explosion acts on the storm vent plate and the force of the storm vent plate exceeds the opening pressure of the storm vent plate, the storm vent plate will break along the crack and open, the burst pressure will be discharged from the gap of the flame arresting net, and the flame is "sudden" by the flame extinguishing layer The effect of quenching is to prevent the explosion pressure and the high temperature generated by the flame from causing harm to the surrounding personnel or equipment, and its structure is usually made of a fire barrier net attached to the foundation of the explosion relief plate.