Detailed explanation of protective measures for explosion-proof dust collectors

Explosion-proof dust collector is an important industrial equipment used to filter dust, smoke and other particulate matter in industrial emissions to prevent environmental pollution and potential explosion risks. In order to ensure its safe and effective operation, a series of protective measures must be taken. The following is a detailed explanation of the protection measures for explosion-proof dust collectors:

1. Design to prevent dust accumulation

The body structure of the explosion-proof dust collector needs to be specially designed to prevent the accumulation of combustible dust in internal components. For example, all beams, partitions, etc. should be equipped with dustproof boards, and the slope of the dustproof boards should be less than 70 degrees to reduce the risk of dust accumulation. The slide angle of the ash hopper should be greater than 70 degrees, and slide plates should be welded to the two adjacent side plates to eliminate dust accumulation caused by too small an included angle.

2. Optimization of dust cleaning system

In the design of filter bag length, bag spacing, and dust cleaning system, it is necessary to ensure thorough dust cleaning to avoid blindly reducing the size of the equipment, resulting in excessive density between bags or too long filter bags, resulting in incomplete dust cleaning and dust accumulation.

3. Anti-static measures

The anti-static filter bag is used, and its friction potential is lower than that of ordinary filter materials, which is helpful to prevent the accumulation of static electricity from causing spark discharge and igniting pulverized coal. Common anti-static filter materials include base cloth woven with conductive yarn filter materials, carbon fiber blended filter materials, stainless steel fiber blended filter materials, etc. At the same time, conductors with good conductivity should be added between all connecting flanges of the dust collector to ensure reliable grounding of the equipment and prevent the accumulation of static electricity.

4. Explosion-proof devices and facilities

• Explosion-proof valve settings: Bag dust removal equipment needs to be equipped with explosion-proof valves according to its explosion-proof ventilation area and explosion pressure, such as adjustable explosion-proof doors with safety locks, heavy hammer-type explosion-proof doors or explosion-proof diaphragms, to ensure that the pressure can be relieved in time in the event of an explosion.

• Pulse valve explosion-proof: Using a right-angle pulse valve or a straight-through pulse valve can effectively prevent the gas pressure inside the dust collector from suddenly rising and avoid the risk of explosion.

• Explosion-proof fan: The use of explosion-proof fans can effectively reduce the fan speed when an explosion occurs inside the dust collector to prevent the fan from becoming a source of fire.

• Install explosion-proof valves on pipelines: Installing explosion-proof valves on the inlet and outlet pipes of the dust collector can effectively prevent flames from spreading through the pipelines during explosions, causing greater accidents.

5. Monitoring and control system

• Dust concentration monitoring: Install a dust concentration monitoring device to monitor the dust concentration in the bag dust collector in real time. When the concentration exceeds the preset threshold, an alarm will be issued in time and corresponding measures will be taken.

• Temperature control: Install thermometers at the entrance of the dust collector, ash hopper, etc. to monitor the temperature at any time and control the flue gas temperature to prevent it from reaching the ignition point.

6. Other security measures

• Improve employee safety awareness: Strengthen employees' awareness of the dangers of dust explosions and conduct regular safety training and emergency drills.

• Fire-fighting facilities: Set up fire-fighting facilities, such as fire hydrants, fire extinguishers, etc., to deal with sudden fire situations.

• Pre-dust removal and metal catcher: Install a metal catcher on the suction pipe of the ventilator or perform pre-dust removal to remove iron wires, nails, etc. mixed in materials and dust to prevent them from entering the dust collector and causing sparks and detonating dust.

7. Electrical safety and anti-static measures

• Selection of electrical equipment: The selection and installation of electrical equipment, monitoring device alarms and control devices installed in dust environment explosion hazard areas should comply with relevant standards.

• Electrical connections: The electrical connections of electrical circuits, electrical equipment, monitoring device alarms and control devices should comply with relevant standards.

• Anti-static measures: Anti-static measures for the dust removal system should comply with relevant standards, and the protective grounding of electrical equipment, monitoring device alarms and control devices should comply with relevant standards.

8. Arrangement and safety measures of dust collectors and air ducts

• Dust collector layout: The dust collector should be placed outside the factory building, away from open fire areas.

• Air duct layout: The air duct should be equipped with automatic fire blocking valves, spark detection and alarm devices, spark extinguishing devices, etc.

• Measures to prevent the infiltration of fog and rainwater: The air ducts and dust collectors arranged outside the factory buildings should take measures to prevent the infiltration of fog and rainwater.

9. Dust cleaning

• Regular cleaning: The remaining dust and mud in the dust removal system should be cleaned regularly, including the dust collection hood, the container for unloading dust and collecting dust in the dry dust collector, and the water filter tank of the wet dust collector, etc.

Through the implementation of the above comprehensive measures, the safety of explosion-proof dust collectors can be effectively improved, the risks of explosions and fires can be reduced, and the safe conduct of industrial production can be ensured.