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The air-swept coal mill is a device used for grinding and drying coal of various hardness levels. It is mainly composed of a feeding device, main bearings, a rotating part, a transmission device, inlet and outlet devices, a high-voltage starting device, and a lubrication system. Widely used in cement building materials, thermal power generation, metallurgical industry, chemical industry, and other fields, the air-swept coal mill features a reasonable structure and high grinding efficiency, making it an ideal piece of equipment for coal powder preparation.
| Strong adaptability to moisture in raw coal. The mill adopts an air-swept structure with a drying chamber, which gives it significant adaptability to the moisture content of raw coal and makes it easy to meet customer requirements. | Strong grinding capability: Inside the grinding chamber, a combination of stepped liners, double-stepped liners, and corrugated liners is arranged in sequence, enhancing the mill's grinding capacity and delivering high economic benefits to customers. |
| Strong heat exchange capacity. The feeding device adopts a louvered structure with inclined air intake, which enhances the heat exchange capacity of the mill and effectively prevents material blockage at the coal mill inlet. |
This mill is driven by an edge drive system, where the motor transmits power through a reducer and large/small gears to drive the mill.
Raw coal enters the mill's feeding device through the feeding equipment, while hot air at around 300°C also enters the feeding device via the air intake pipe. The drying chamber is equipped with specially designed lifting plates that lift the raw coal, enabling intense heat exchange and drying at this stage. The dried coal chunks then pass through a double-layer partition plate with lifting plates into the grinding chamber.
The grinding chamber is equipped with grinding media (steel balls), where coal chunks are crushed and ground into coal powder. While the coal chunks are being crushed, a dedicated induced draft fan, through the mill's discharge device, carries the crushed coal powder and gas out of the mill together. Coarser particles are returned to the grinding chamber via the return screw of the discharge device for further grinding.
| Project Specifications (m) | Φ2.2 ×4.4 | Φ2.4 ×4.75 | Φ2.4×4.5 +2 | Φ2.5 ×3.9 | Φ2.6×5.25 +2.25 | Φ2.8×5 +3 | Φ2.9 ×4.1 | Φ3.0×6 +3 | Φ3.2× 6.75+2 | Φ3.4× 6+3 | Φ3.8× 7+2.5 | Φ3.8×7.25 +3.5 | |
| Working speed (r/min) | 22.4 | 20.4 | 20.4 | 20 | 19.7 | 18.3 | 18.8 | 17.3 | 16.9 | 17.5 | 16.4 | 16.4 | |
| Production capacity (t/h) | 8-9 | 12-14 | 11-12 | 10 | 13-14 | 16-17 | 14-16 | 19-20 | 27-29 | 28-30 | 38-40 | 41-43 | |
| Product fineness (%) | 10-12 | 8-10 | 8-10 | 8-10 | 8-10 | 8-10 | 8-10 | 8-10 | 8-10 | 12 | 12 | 12 | |
| Feed particle size (mm) | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | |
| Grinding Media Loading Capacity (t) | 20 | 22 | 22.5 | 22 | 28 | 32 | 35 | 43 | 50 | 55 | 80 | 85 | |
| Moisture (%) | Enter the mill | ＜10 | ＜10 | ＜10 | ＜10 | ＜10 | ＜12 | ＜10 | ＜10 | ＜10 | ＜12 | ＜12 | ＜12 |
| Out of the mill | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | ＜2 | |
| Temperature (℃) | Enter the mill | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 | ＜350 |
| Out of the mill | 60 ~ 80 | 60 ~ 80 | 60 ~ 80 | 70 ~90 | 70 ~ 90 | 60 ~ 80 | 60 ~ 80 | 70~90 | 80~90 | 60 ~ 80 | 60 ~ 80 | 60 ~ 80 | |
| Main reducer | ZD60 | ZD60 | ZD60 | ZD60 MBY450 | ZD70 MBY450 | ZD70 MBY500 | ZD80 MBY560 | ZD80 MBY560 | JDX630 | JDX710 | MBY710 | MBY800 | |
| Main Motor (kW) | 250 | 280 | 315 | 315 | 400 | 500 | 500 | 630 | 710 | 800 | 1250 | 1400 | |
| Total weight (t) | 46 | 54 | 76 | 62 | 98 | 107 | 78 | 124 | 148 | 162 | 178 | 220 | |
