When adding activated carbon powder, do we need to consider powder explosion-proof issues in the factory?

The issue of powder explosion protection needs to be considered. Because activated carbon powder is a flammable and explosive substance, static sparks or other heat sources may be generated during the adding process, causing explosion accidents. Therefore, before adding activated carbon powder, it is necessary to detect the dust concentration in the air in the factory to ensure that it does not exceed safety standards, and to take explosion-proof measures, such as ventilation, electrostatic floors, etc. -

What explosion protection level should be considered for activated carbon powder dust explosion electrical appliances?

In the case of handling flammable and explosive dusts, the explosion protection level of electrical equipment needs to be considered. Commonly used explosion-proof levels of electrical equipment are classified according to European standards (ATEX) or North American standards (NEC or NFPA70). For activated carbon dust explosion hazardous locations, electrical equipment needs to meet the appropriate explosion-proof level to ensure safety. Generally, it must meet the following requirements: 1. Protection level: The explosion protection level should be at least IP65. 2. Explosion-proof level: The explosion-proof level of electrical equipment should be selected according to the actual situation. For example, electrical equipment with an explosion-proof level of Ex d IIB T3 Gb can be used. 3. Electrostatic charge: Electrical equipment should have the function of eliminating electrostatic charges. 4. Reliability: Electrical equipment needs to be specially designed and tested to ensure its reliability and durability under extreme conditions. It should be noted that when loading, unloading, transporting and adding activated carbon powder, operators need to wear explosion-proof clothing, explosion-proof shoes and other protective equipment throughout the process, and receive professional training and guidance. -

Activated carbon is non-flammable and non-explosive. Activated carbon is a specially treated carbon that heats organic matter (shells, coal, wood, etc.) under air-insulating conditions to reduce non-carbon components (this process is called charring) and then reacts with gas to form a surface. Erosion creates a microporous structure (a process called activation). exist * * In the notice issued by the General Office of the State Administration of Work Safety on the issuance of the "Catalogue of Key Combustible Dusts in Industrial and Trade Industries (2015 Edition)" and the "Technical Guidelines for Explosion Prevention of Process Facilities in Combustible Dust Workplaces in Industrial and Trade Industries (Trial)", activated carbon was not included.

Activated carbon lacks volatile components and is not easy to burn, but there is still a risk of combustion and explosion, especially when dust is flying when the powder is added. Therefore, electrical explosion protection, dust removal and explosion protection must be done. Temperature detection points, nitrogen filling or water spraying measures should be set up.

Metal powders must be explosion-proof, not to mention activated carbon powder. It is recommended that the equipment adding activated carbon powder be placed in a separate room. This can avoid overly large explosion-proof areas and increase the explosion-proof cost of the equipment.

First determine whether the dust diameter is 500μm or less, and then determine whether the dust resistivity is ≤1000Ω* m, conductive dust is Class IIIC explosion-proof, and non-conductive dust is Class IIIB explosion-proof.

I used to think that charcoal and coal powder must be explosive dust, but after actual testing, many types are not explosive dust.

You can consider preparing the slurry outdoors, adding the slurry, and eliminating the need for explosion protection indoors.

There is an essential difference between pulverized coal and activated carbon. Coal is a natural mineral organic matter and is flammable. Especially when pulverized coal is mixed with air, there is a danger of combustion and explosion. Activated carbon has already been made into carbon and does not have explosive conditions. But I have been doing pneumatic conveying of pulverized coal for many years, always conveying 300 mesh pulverized coal through air, and there has never been an explosion problem. Of course, during the design, the containers (silos) involved were designed for explosion relief.