Explosion Proof Unloader

Explosion proof unloader is a discharge device designed specifically for flammable and explosive dust (such as coal powder, aluminum powder, plastic powder, etc.), installed at the bottom of the dust collector hopper and material bin. Its core function is to continuously and uniformly discharge dust in a closed state, while blocking external flames from entering the interior of the equipment to prevent dust explosion accidents. It is widely used in industrial scenarios such as power, chemical, grain processing, and new energy where flammable and explosive dust exists, and is a key equipment for protecting dust removal and material conveying systems.

Its working principle is based on the dual design of "closed discharge+explosion-proof blocking": the equipment body is a cylindrical shell, with a rotating impeller (usually 8-12 blades) inside, driven by an explosion-proof motor to rotate at low speed (speed 10~60r/min); When the dust in the dust collector hopper falls into the shell, the impeller blades separate the dust in the chambers between the blades, and it is sent to the discharge port for discharge with the rotation of the impeller, achieving "continuous discharge without dust leakage"; At the same time, the equipment blocks flame propagation through multiple explosion-proof structures (such as explosion-proof motors, explosion-proof bearings, and fireproof star sealing devices) - if an external fire occurs, the sealing structure can prevent the flame from entering the ash hopper and igniting the internal dust. If the internal dust accidentally ignites, the explosion-proof shell can withstand a determined explosion pressure (usually ≥ 0.1MPa) to avoid equipment rupture.

The structural design focuses on "explosion prevention and sealing": firstly, the configuration of explosion-proof components, using explosion-proof motors (explosion-proof grade Ex d IIB T4 and above), explosion-proof junction boxes, and explosion-proof sealing rings at the connection between the motor and the housing to prevent spark leakage; The second is the design of sealing protection, with the clearance between the impeller and the shell controlled at 0.1-0.3mm (to reduce dust leakage), and an elastic sealing gasket installed at the discharge port. Some equipment also adds a nitrogen protection interface on the outside of the shell (for high-risk dust scenarios, isolating the air); The third is the impact resistant structure. The shell is made of Q235-B steel plate or stainless steel plate (thickness 8-12mm) welded and formed, and the inner wall is polished to reduce dust accumulation. Key parts are reinforced with ribs to enhance the ability to resist explosive impact.

The core advantages are reflected in three aspects: firstly, Anran has good explosion-proof performance, which meets the requirements of GB 15577 "Dust Explosion proof Anran Regulations". The explosion-proof level can be customized according to the type of dust (such as IIB, IIC level), which can effectively block the spread of flames and explosions, and reduce Anran risks; The second is stable unloading without leakage, with the impeller rotating at a constant speed to achieve continuous unloading, avoiding blockage of the ash hopper caused by dust accumulation. At the same time, the closed structure ensures that the dust leakage is ≤ 5mg/m ³, meeting environmental and safety requirements; Thirdly, it has wide adaptability and can customize equipment diameters (commonly DN150~DN400) according to the discharge volume (ranging from 0.5~50m ³/h). The material can be selected from carbon steel (conventional working conditions) or stainless steel (corrosion resistance (based on actual reports), and can adapt to different dust characteristics and working conditions.