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28
2026
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04
The Aogong dry-mist dust suppression system helps Shougang achieve its goals of green transformation and environmental upgrading.
Dry-mist dust suppression system
Author:
Aogong Technical Department
As a benchmark enterprise in China’s steel industry, Beijing Shougang has taken on the mission of green transformation. In close alignment with the national policy on ultra‑low emissions in the steel sector, it is tackling the challenge of fugitive dust emissions from areas such as material yards and coal‑conveying belts. To achieve both environmental compliance and operational efficiency, Shougang has partnered with Guangzhou Aogong Spray Equipment Co., Ltd. to deploy a specialized dry‑mist dust suppression system, precisely addressing dust generation at various stages of production. This collaboration supports Shougang’s transition to green, low‑carbon development and sets a new standard for environmental upgrading in the steel industry.
Within steel plant production areas, processes such as raw material storage, belt conveyance, and car‑unloading operations generate substantial dust. This not only contaminates the surrounding environment and adversely affects workers’ physical and mental health but also makes it difficult to meet national ultra‑low emission standards. Conventional water‑spraying dust suppression methods consume large volumes of water and can easily cause material moisture levels to exceed acceptable limits, thereby reducing subsequent production efficiency. Meanwhile, standard misting equipment delivers poor atomization, failing to effectively capture fine particulates like PM2.5 and resulting in subpar dust control. This project faces three major challenges: first, dust‑emitting points are numerous and widely dispersed, spanning multiple areas including raw material yards, belt transfer stations, and car‑unloading facilities, requiring comprehensive coverage; second, it must balance dust suppression performance with production requirements, preventing excessively large droplets from compromising material quality; and third, the equipment must be tailored to the complex operating conditions of a steel plant, offering wear resistance, corrosion resistance, and reliable year‑round operation.
In response to the aforementioned challenges, Aogong Spray has leveraged the principles of gas–liquid two-phase flow atomization to develop a comprehensive dust‑control system. By upgrading its micron‑scale dry‑mist dust suppression technology, the system effectively resists both plant‑yard dust and corrosive media, making it well suited for harsh outdoor operating conditions. Employing precision dual‑fluid dry‑mist spraying, the system maintains droplet sizes between 1 and 10 μm, precisely matching the size of dust particles. Through collision, adsorption, and coalescence, it induces dust settling, achieving source‑level dust suppression while keeping the increase in material moisture below 0.05%, thus preserving production efficiency. The system is equipped with PLC‑based control, enabling real-time monitoring of dust concentrations; when thresholds are exceeded, misting automatically activates, and once compliance is restored, the system shuts down automatically. Additionally, the layout has been optimized, incorporating CFD simulations of dust dispersion pathways to ensure complete coverage at every emission point, thereby further enhancing dust‑suppression effectiveness.
After the project was commissioned, dust suppression proved highly effective, with particulate matter concentrations in the plant area consistently maintained below 8 mg/Nm³—well below the national ultra‑low emission standards. Dust suppression efficiency exceeded 90%, significantly improving the ecological environment within the plant and its surrounding areas while safeguarding employees’ occupational health. Compared with conventional dust‑control methods, the system reduces water consumption by more than 70% and delivers substantial savings in chemical usage.
The dry‑mist complete system and equipment for this project not only operate with exceptional stability and reliability but also feature freeze‑protection and self‑cleaning capabilities, enabling them to withstand the severe cold of northern climates. With zero major failures throughout the year, the system perfectly meets Shougang’s requirements for continuous production. Beyond helping Shougang successfully pass the ultra‑low‑emission environmental compliance inspection, the system has also achieved the goal of “dust suppression without disrupting production, delivering a win‑win outcome for both environmental protection and operational efficiency,” earning high praise from Shougang’s management.
This collaboration represents one of the landmark achievements of Guangzhou Aogong Spray Equipment Co., Ltd. among numerous dust-control projects across China’s steel industry. It has provided practical, viable solutions for dust management in key production processes such as raw-material storage yards, belt‑conveyor transfer points, and car‑unloading operations, while also significantly advancing the adoption and application of dry‑mist dust suppression technology within the steel sector.
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