• Categories:News Center
• Time of issue:2022-05-06 11:19

(Summary description)Powder conveying is a difficult job, because there are many kinds of materials, and there are many problems to be solved when conveying under different conditions, depending on the nature of the powder, the distance to be conveyed, and whether the appropriate conveying speed needs to be achieved. In addition, with the increased awareness of explosion, emissions, and environmental risks in today's production environments, business executives must carefully consider these factors when selecting the appropriate bulk powder delivery method. Although domestic regulatory requirements for safe operation are not as stringent as those in Europe and the United States, the recent increase in production accidents related to powder production has led to awareness of the risks associated with powder transportation.   There is ample evidence that dust-free powder conveying is necessary to minimize these hazards, so modern pneumatic conveying manufacturers are increasingly raising the bar on existing equipment. Before investing in any system, three key business aspects should be identified. They are: Production environment safety - does the system eliminate the risk of explosion? Process Safety - Does the system protect the product from contamination and/or protect the operator from the substances being delivered, such as antibiotics. Hygiene - Does the system provide for easy cleaning, quick product changes and equipment maintenance? Vacuum pneumatic conveying is increasingly considered to be the most suitable way to convey hazardous powders due to its unique "closed system" function. The obvious advantage of vacuum pneumatic conveying is that if a leak occurs, the leak is inward. And, there are more other advantages in this way.   In industrial production, there are 13 potential ignition sources as follows: 1. Chemical reaction 2. Hot Surface 3. Mechanical Spark 4. Flame, hot gas 5. Electrical installations 6. Lightning 7. Electrical compensation current 8. Ultrasound 9. High frequency radiation 10. Electromagnetic waves 11. Adiabatic compression 12. Ionizing Radiation 13. Electrostatic charge   If the vacuum pneumatic conveying system is fully grounded and properly accepted, the vacuum pneumatic conveying system can be safely used on any powder with a minimum ignition energy (MIE) greater than 1 MJ when conveyed in a pure powder environment. There is no explosion without ignition, MIE is established by reducing the energy required to ignite. MIE values ​​of typical powders: Magnetic powder 1mJ Aluminum powder 3 MJ Cornstarch 3-5MJ Acetaminophen <10 mJ Epoxy 10 MJ Magnesium 20 MJ Sugar 30 MJ Cellulose 40 MJ Flour 50 MJ PVC 1500 MJ (Note: The above values ​​are for reference only. MIE may vary according to different external factors. Tests should be carried out with exact products under conditions close to actual use to determine specific values.) If flammable gases are present, the use of systems using nitrogen as the delivery medium is a safe method. Safe delivery In essence, vacuum pneumatic conveying is less likely to leak, and when a leak point occurs, air leaks inward. Thus, with simple steps such as ensuring proper venting at the point of discharge or delivery, and using properly designed connectors, the potential for leaking powder to pose a threat to operators or the environment can be avoided.   When a pneumatic conveying system requires more rigorous cleaning, methods such as clean-in-place, wash-in-place, or wet-in-place are often used. These techniques typically involve the use of spray nozzles and/or water-soaked conveyor belts to disassemble equipment. But for pneumatic conveying systems, the biggest challenge in the cleaning process is not cleaning, but drying. Based on this, modular pneumatic conveying system components that are manufactured for ease of production and installation have greater advantages. Lightweight and hygienic hose design also has a large impact on the effectiveness of the system, and recent advances in the use of static dissipative opaque hoses (including molded cuffs with sanitary fittings) have increased the practicality of hose handling. Vacuum pneumatic conveying systems are today an extremely versatile, safe, reliable and clean method of transporting bulk powders with the advantage of being easy to disassemble, assemble and clean. The increasing use of vacuum pneumatic conveying systems in production processes in all walks of life increases the efficiency of factories and ultimately the profitability of manufacturers.