A large industrial enterprise in Changsha, Hunan, faced multiple challenges in the flue gas denitrification process, including low efficiency in traditional powder dosing methods, high labor costs, and severe environmental pollution. To meet stricter environmental emission standards, the company introduced a negative pressure jet conveying system for denitrification powder provided by Head Powder, achieving automated and sealed operation throughout the entire process from powder storage to injection. This case studies a detailed demonstration of the system's application background, technical advantages, and practical effects.

Case Summary

This project is located in Changsha, Hunan, serving a user of coal-fired or industrial boilers with a relatively large annual production scale. The original process used manual bag unpacking and mechanical lifting to transport denitrification agents (such as urea, sodium bicarbonate, and other powders), which faced issues such as inaccurate dosing amounts, dust leakage, high equipment failure rates, and high maintenance costs. Head Powder designed a negative pressure pneumatic jet conveying system based on site conditions, delivering powder directly from the storage silo through sealed pipelines to the furnace or flue injection port, achieving accurate, stable, and dust-free dosing. After the upgrade, flue gas denitrification efficiency improved and operating costs significantly decreased.

Customer pain points

Before the project transformation, the client mainly faced the following pain points:

• Feeding accuracy difference:Manual operation cannot adjust powder volume in real time according to flue gas load, leading to waste or excessive emissions of denitrification;
• Severe dust pollution:The process of unpacking and transferring produces a large amount of dust, endangering operator health and failing to meet environmental protection requirements;
• Frequent equipment maintenance:Traditional screw feeders and bucket lifters are prone to clogging and wear, with long downtime and maintenance periods, affecting production continuity;
• High dependence on manual labor:Multiple workers are required to operate around the clock, resulting in high labor intensity and workflow that causes unstable processes.

Product advantages

To address these pain points, Head Powder's negative pressure jet conveying system is designed and implemented with "efficiency, sealedness, and intelligence" as its core principles. Specific solutions include:

• Fully enclosed negative pressure conveying:The system uses a negative pressure suction principle, ensuring that powder remains in a low-pressure, sealed state throughout the pipeline, with no dust leakage and a clean working environment;
• Relatively accurate measurement and automatic control:Equipped with high-precision weighing hoppers or weightless feeders, combined with PLC and online flue gas monitoring data, automatic injection rate adjustment to improve denitrification efficiency;
• Low energy consumption long-distance conveying:Using the negative pressure power generated by Roots blowers, stable conveying can be carried within tens to hundreds of meters, without the need for intermediate transfer equipment;
• Modular and easy-maintenance design:Key components use wear-resistant materials, and the quick-install pipeline interface facilitates maintenance, reducing daily system maintenance workload by more than 60% compared to traditional equipment.

After project implementation, the customer's denitrification agent consumption was reduced by about 15%, dust emission concentration was below 5mg/m³, achieving round-the-clock unattended operation and significantly lowering overall operating costs.