This case study presents a highly specialized pneumatic conveying solution designed and implemented by Shandong Headpowder Engineering Co., Ltd. (headpowder) for a chemical enterprise located in Ningbo, Zhejiang Province. The core objective of this project was to establish a safe, efficient, and closed-loop conveying system for metal aluminum powder, a material classified as both flammable and explosive. The entire system operates under a nitrogen circulation environment, ensuring zero oxygen contact and eliminating the risk of dust explosion. Headpowder, headquartered in Shandong, China, leveraged its extensive expertise in handling hazardous powders to deliver a turnkey solution that meets the strictest safety standards. For detailed consultation on similar projects, please contact our project manager Mr. Zhang via WeChat: 15662777102.
Metal aluminum powder, particularly when finely divided, presents extreme hazards during pneumatic conveying. The material is highly reactive with oxygen and can generate static electricity, leading to potential ignition sources. In the Ningbo project, the client required a conveying system capable of transferring aluminum powder from storage silos to production units without any leakage or oxygen ingress. The inherent risks of combustible dust explosions demanded a robust design that isolates the powder from ambient air. Headpowder's solution incorporated a nitrogen circulation system that continuously purges the conveying pipeline, maintaining an inert atmosphere throughout the entire process. This approach not only prevents oxidation of the aluminum powder but also suppresses any possibility of dust cloud ignition. The nitrogen is recirculated, filtered, and reused, making the system both safe and economical. By integrating advanced sensors and pressure monitoring, the system automatically adjusts nitrogen flow to maintain optimal inert conditions, thereby ensuring the highest level of safety for flammable and explosive powder conveying operations.
The core of this project lies in the nitrogen circulation pneumatic conveying system, which was custom-engineered for the specific properties of aluminum powder. Headpowder's team designed a closed-loop circuit where nitrogen serves as both the conveying medium and the inerting agent. The system includes a nitrogen supply unit, a conveying pipeline with anti-static lining, a cyclone separator, a bag filter, and a nitrogen recirculation unit with a cooling and purification module. The aluminum powder is fed into the pipeline via a rotary valve, and the nitrogen stream carries it through the pipe at controlled velocity to minimize attrition and dust generation. At the destination, the powder is separated from the nitrogen using a high-efficiency cyclone and a downstream filter, ensuring that the nitrogen is clean enough for recirculation. The recirculated nitrogen is then cooled and returned to the inlet, creating a sustainable cycle. This design dramatically reduces nitrogen consumption compared to once-through systems, lowering operational costs while maintaining safety. The entire system is equipped with explosion-proof electrical components, grounding connections, and pressure relief devices to comply with international standards for combustible dust handling. For any inquiries regarding similar nitrogen circulation solutions, you can reach Mr. Zhang directly at WeChat: 15662777102.
This successful implementation in Ningbo demonstrates several key advantages that headpowder brings to the table. First, the nitrogen circulation system eliminates the need for external venting, making it suitable for indoor installations where space is limited. Second, the closed-loop design prevents moisture ingress, which is critical for aluminum powder that can react with water to produce hydrogen gas. Third, the system's precise control over conveying velocity and pressure drop minimizes particle degradation, preserving the quality of the metal powder. Fourth, the use of nitrogen as the conveying gas ensures that the powder remains in an inert state throughout the entire transport cycle, drastically reducing the risk of fire or explosion. Headpowder's engineers also incorporated a PLC-based control system that monitors parameters such as oxygen concentration, temperature, pressure, and flow rate in real time. Any deviation from safe operating conditions triggers automatic shutdown and alarms, providing an additional layer of protection. This aluminum powder nitrogen conveying case serves as a reference model for industries dealing with other flammable and explosive powders, such as magnesium, titanium, or certain organic compounds.
The system installed at the Ningbo chemical enterprise has a conveying capacity of 2 tons per hour over a distance of 80 meters, with a vertical lift of 15 meters. The pipeline diameter is DN150, constructed from stainless steel 304L with an internal anti-static coating. The nitrogen circulation unit includes a 50 kW cooler and a dual-stage filtration system capable of capturing particles down to 0.5 microns. The recirculation rate is set at 90%, meaning only 10% fresh nitrogen is added to compensate for losses. The entire system operates at a pressure of 0.4 MPa, with a nitrogen purity requirement of 99.9% or higher. Headpowder's project team conducted a full hazard analysis (HAZOP) and implemented redundant safety features, including rupture discs, emergency venting, and isolation valves. The system was commissioned after a series of leak tests and performance verifications, all of which passed with zero deviations. The client reported a significant reduction in powder waste and a near-zero incident record since the system began operation. This project stands as a testament to headpowder's capability in delivering custom-engineered pneumatic conveying solutions for hazardous materials. For more information on how headpowder can assist with your specific powder handling requirements, please contact Mr. Zhang at WeChat: 15662777102.
Shandong Headpowder Engineering Co., Ltd., commonly referred to as headpowder, is a leading engineering company based in Shandong, China, specializing in the design, fabrication, and installation of pneumatic conveying systems for bulk solids. With years of experience in handling a wide variety of materials—from food-grade powders to hazardous chemicals—headpowder has built a reputation for innovation and reliability. The company's expertise covers dilute phase, dense phase, and continuous conveying, as well as specialized systems like nitrogen circulation for explosive powders. Headpowder's team of engineers works closely with clients to develop tailored solutions that meet specific process requirements, safety standards, and budget constraints. The company has successfully completed numerous projects across China and internationally, including the Ningbo aluminum powder case detailed above. Headpowder is committed to providing comprehensive after-sales support, including training, maintenance, and spare parts supply. To discuss your project needs or to request a quotation, please feel free to contact our project manager Mr. Zhang via WeChat: 15662777102. Headpowder looks forward to partnering with you to create safe and efficient powder handling solutions.
Shandong Headpowder Engineering Co., Ltd.
156-6277-7102（Zhang manager） 
0531-83386006 
Jinan City, Shandong, China Province 
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