Guizhou Zunyi Flue Gas Denitrification Powder Conveying System

Headpowder delivered a custom-engineered flue gas denitrification powder conveying system for a major coal-fired power plant located in Zunyi, Guizhou Province. This system is designed to reliably transport urea-based denitrification powder from storage to the injection points within the selective non-catalytic reduction (SNCR) process, ensuring consistent NOx reduction while maintaining operational safety and environmental compliance.

Customer Challenges

Before the project, the plant experienced frequent blockages in the powder conveying lines due to the hygroscopic nature of the denitrification powder, which caused material bridging and inconsistent flow. The existing open conveying method also led to dust leakage, creating safety hazards and requiring frequent manual cleaning. Inaccurate feeding rates further resulted in uneven NOx reduction, increasing reagent waste and compliance risks. The plant needed a fully enclosed, reliable, and precise conveying solution that could operate under varying humidity and temperature conditions with minimal maintenance.

Our Solution & Advantages

Headpowder's dense-phase pneumatic conveying system was selected to address these pain points. The system features a fully sealed pipeline design, eliminating dust leakage and improving workplace safety. A specially designed anti-bridge discharge hopper and vibratory feeder ensure smooth material flow even with high-moisture powder. Advanced flow measurement and feedback control allow real-time adjustment of conveying rate, achieving feeding accuracy within ±1%. The system's low-velocity, dense-phase transport reduces pipeline wear and energy consumption, while the modular control unit integrates seamlessly with the plant's existing DCS. As a result, reagent usage decreased by approximately 12%, NOx emission consistently met local standards, and maintenance downtime was reduced by over 60% year-over-year.

System Components

The conveying system includes a stainless steel storage hopper with a capacity of 50 m³, a rotary valve feeder, a nitrogen-pressurized conveying vessel, a dedicated pipeline network with wear-resistant bends, and multiple injection lances at the furnace wall. All components are designed for continuous 24/7 operation with remote monitoring capability.