A major chemical enterprise based in Lanzhou, Gansu Province, faced a critical challenge in safely transporting nitroguanidine powder – a highly sensitive and explosive chemical raw material. The conventional open conveying methods posed unacceptable risks of dust explosion and environmental contamination. To address this, the company partnered with Shandong Headpowder Engineering Co., Ltd. (known as headpowder) to design and implement a specialized nitrogen-circulated pneumatic conveying system. This case study details the technical solution, system advantages, and operational outcomes that have set a new benchmark for explosive powder handling in the chemical industry.
Nitroguanidine powder is classified as an explosive chemical raw material due to its high sensitivity to impact, friction, and static electricity. In its dry powder form, even a minor spark can trigger a violent deflagration. Traditional mechanical conveyors, such as screw or belt systems, generate friction heat and dust clouds, making them inherently unsafe. Moreover, the powder’s tendency to agglomerate and its low bulk density require precise flow control. The Lanzhou facility needed a solution that could eliminate oxygen, suppress dust, and maintain a closed-loop environment – all while achieving reliable, continuous conveying. headpowder’s engineers recognized that only a nitrogen protection conveying system could meet these stringent safety and performance requirements.
At the core of the project lies a nitrogen-circulated pneumatic conveying system, specifically engineered for nitroguanidine powder conveying. The system operates on a closed-loop principle: nitrogen gas is used as the conveying medium, continuously circulated through the pipeline to maintain an inert atmosphere. A dedicated nitrogen generator supplies high-purity gas, while a pressure-regulating unit ensures stable flow. The powder is introduced into the pipeline via a rotary airlock feeder, which minimizes oxygen ingress. As the nitrogen stream carries the powder through the conveying line, any residual oxygen is purged, and the risk of combustion is virtually eliminated. The system also includes a cyclone separator and a bag filter to recover the powder and recycle the nitrogen, achieving both efficiency and safety. This design not only protects the explosive chemical raw material but also reduces nitrogen consumption, making it economically viable for continuous operation.
Shandong Headpowder Engineering Co., Ltd. brings decades of experience in designing custom pneumatic conveying systems for hazardous materials. For this project, several unique features were incorporated: First, the entire system is constructed from stainless steel with grounding to prevent static buildup. Second, intelligent sensors monitor pressure, temperature, and oxygen concentration in real time, triggering automatic shutdown if any parameter exceeds safe limits. Third, the nitrogen circulation loop is optimized for minimal leakage, with a heat exchanger to cool the gas and prevent thermal degradation of the powder. Compared to conventional systems, headpowder’s solution reduces energy consumption by 30% and eliminates the need for manual handling, thereby enhancing workplace safety. The company’s expertise in explosive chemical raw material handling is further validated by certifications from international safety standards.
The project in Lanzhou began with a thorough site audit and risk assessment by headpowder’s technical team. The conveying distance was approximately 150 meters, with multiple bends and elevation changes. The system was designed to handle 5 tons per hour of nitroguanidine powder, with a nitrogen pressure of 0.4 MPa. During installation, special attention was paid to sealing joints and using explosion-proof electrical components. After commissioning, the system achieved a conveying efficiency of 98% with zero safety incidents over a six-month trial period. The client reported a significant reduction in dust emissions and maintenance downtime. The success of this case has led to follow-up orders for similar nitrogen-circulated pneumatic conveying systems in other explosive material applications. For any enterprise dealing with explosive chemical raw materials, this proven solution offers a reliable path to operational excellence.
Shandong Headpowder Engineering Co., Ltd. is headquartered in Shandong, China, and has a global track record in delivering turnkey pneumatic conveying solutions. The company’s core competency lies in handling difficult-to-convey materials, including nitroguanidine, ammonium nitrate, and other energetic powders. Every system is customized based on the material’s properties, conveying distance, and site conditions. With a focus on safety, efficiency, and long-term reliability, headpowder has become a trusted partner for chemical plants across Asia. The Lanzhou project is just one example of how the company’s nitrogen protection conveying system can transform hazardous material logistics. For more information or to discuss your specific requirements, please contact the project manager directly.
For inquiries regarding nitroguanidine powder conveying, nitrogen protection conveying systems, or any other explosive chemical raw material handling solutions, please reach out to Manager Zhang of Shandong Headpowder Engineering Co., Ltd. You can contact him via WeChat at 15662777102. Our team is ready to provide technical consultation and a customized proposal for your facility in China or abroad. Trust headpowder to deliver safe, efficient, and sustainable pneumatic conveying systems that meet the highest industry standards.
Shandong Headpowder Engineering Co., Ltd.
156-6277-7102（Zhang manager） 
0531-83386006 
Jinan City, Shandong, China Province 
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