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Vertical coal mill, also called a vertical mill, is a type of vertical mill that is specially used to process coal. The main function of this machine is to grind raw coal into pulverized coal. It is the core equipment in the boiler pulverized coal preparation system.
In the process of preparing pulverized coal, the vertical coal mill has the characteristics of less dust, low noise, and excellent pulverized coal combustion performance. In addition, it has a compact structure and a small footprint, and the safe operation of the equipment is ensured by using explosion-proof measures such as temperature detection devices and online gas analyzers.
The working principle of the vertical coal mill is based on an electric motor drive, which drives the grinding disc of the coal mill to rotate through a planetary reducer. The grinding rollers on the grinding disc rotate under the drive of the grinding disc. The raw coal falls into the center of the grinding disc through the coal drop pipe. Due to the hydraulic loading force, the grinding roller and the grinding disc are squeezed, crushing the large particles of raw coal. The sliding friction force generated by the relative movement of the grinding roller and the grinding disc further realizes the crushing of small coal particles. At the same time, hot air (generally below 300°C) is passed into the vertical mill to dry the moisture of the raw coal so that it meets the requirements of the finished coal powder. The ground pulverized coal is conveyed by air into the separator for separation. Qualified pulverized coal is transported to the pulverized coal bin, while unqualified coarse pulverized coal is returned to the mill for regrinding.
There are many vertical coal mills, which can be divided into low-speed, medium-speed, and high-speed coal mills according to the speed. Among them, medium-speed coal mills (i.e. roller disc mills) have been widely used due to their wide applicability, low energy consumption, low steel consumption, easy maintenance, and low noise.
| Model | Grinding table dia.(mm) | Max feeding size(mm) | Discharge size(um) | Discharge size(mesh) | Air-in tempreture(℃) | Air-out tempreture(℃) | Input material moisture | Final moisture | Capacity(t/h) | Motor Power(kw) |
|---|---|---|---|---|---|---|---|---|---|---|
| SRM1300 | 1300 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4-15% | ≤1% | 10-35 | 185-250 |
| SRM1500 | 1500 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4-15% | ≤1% | 13-48 | 250-355 |
| SRM1700 | 1300 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4-15% | ≤1% | 18-68 | 355-600 |
| SRM1900 | 1900 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4-15% | ≤1% | 23-85 | 450-600 |
| SRM2200 | 2200 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4-15% | ≤1% | 36-135 | 710-1000 |
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