Baichy Heavy Industrial Machinery Co., Ltd
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The Coal Vertical Mill (also known as a coal mill, medium-speed coal pulverizer, or vertical roller mill) is a highly efficient and energy-saving grinding device that integrates crushing, grinding, drying, classifying, and conveying functions into a single unit. Widely utilized across the power generation, cement, steel, metallurgy, and chemical industries, it is specifically designed for the preparation of pulverized coal for injection or general industrial use. Compared to traditional ball mill systems, this equipment offers significant advantages in terms of energy consumption, environmental protection, and automated control, making it the mainstream choice for modern industrial pulverized coal preparation.
The core competitiveness of the Coal Vertical Mill lies in its "multi-purpose, all-in-one" system integration capabilities and its remarkable energy-saving performance. The following is a detailed breakdown of its key technical features:
• Exceptionally High Grinding Efficiency: Employing the principle of rolling and shearing action via grinding rollers, the mill achieves high energy utilization efficiency. Compared to ball mill systems of equivalent capacity, it can reduce electricity consumption by 30% to 50%, delivering substantial energy savings.
• Powerful Drying Capability: High-temperature hot air (sourced from industrial waste gas or hot air furnaces) is introduced into the mill, enabling simultaneous drying during the grinding process. This allows for raw materials with moisture content exceeding 15% to be fed into the mill, while the moisture content of the finished product can be controlled to within 1%.
• Superior Environmental Performance: The entire machine features a fully sealed structure and operates under negative pressure. This effectively prevents dust leakage and spillage; furthermore, the equipment generates minimal vibration and low noise levels, thereby meeting strict environmental emission standards.
• Advanced Automated Control: Equipped with an automatic hydraulic pressurization system and a PLC/DCS remote control system, the mill enables the automatic adjustment of grinding pressure, airflow volume, and temperature. This ensures simple operation with minimal manual intervention required.
• Stable Product Quality: Featuring a built-in, high-efficiency dynamic classifier, the mill allows for the precise adjustment of rotor speed via variable frequency control. This enables precise control over the fineness of the pulverized coal (e.g., the residue on an 80μm sieve—R80μm—can be adjusted), resulting in a uniform particle size distribution that facilitates subsequent complete combustion.
The fundamental operation of a vertical coal mill represents a perfect synergy between "physical pulverization" and "thermodynamic drying." Its workflow follows a cyclical path comprising "crushing + shearing + drying + classifying":
Raw coal is fed via a feeder into the center of the rotating grinding table; under the influence of centrifugal force, it moves outward toward the edges.
Driven by a hydraulic system, grinding rollers press firmly against the layer of coal on the grinding table. As the table rotates, these rollers exert intense crushing and shearing forces on the coal, thereby pulverizing it.
High-velocity hot air (ranging from 80°C to 350°C) rising from the air ring penetrates the coal layer, carrying the finely ground coal powder upward into the classifier while simultaneously and instantaneously evaporating the moisture contained within the coal.
The air-powder mixture enters the classifier; coarse particles are flung back onto the grinding table by centrifugal force for further grinding, while qualified coal powder—meeting the required fineness specifications—is carried by the airflow into the downstream dust collection system.
The coal powder is captured within a bag filter or electrostatic precipitator and is finally discharged through an air-lock discharge mechanism (such as a rotary airlock valve) to become the finished pulverized coal product.
| Model | Grinding table dia.(mm) | Max feeding size(mm) | Discharge size(um) | Discharge size(mesh) | Air-in tempreture(℃) | Air-out tempreture(℃) | Max Input Material Moisture(%) | Final moisture(%) | Capacity(t/h) | Motor Power(kw) |
|---|---|---|---|---|---|---|---|---|---|---|
| SRM1300 | 1300 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4 | ≤1 | 10-28 | 132-200 |
| SRM1500 | 1500 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4 | ≤1 | 13-38 | 220-285 |
| SRM1700 | 1700 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4 | ≤1 | 18-68 | 315-400 |
| SRM1900 | 1900 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4 | ≤1 | 23-85 | 450-600 |
| SRM2200 | 2200 | ≤38 | 212-45 | 70-325 | ≤350 | 70-95 | 4 | ≤1 | 36-135 | 600-750 |
A: They are primarily suitable for bituminous coal, sub-bituminous coal, and certain types of lean coal. For coal varieties with high volatile content and high flammability, special attention must be paid to temperature control within the mill to prevent spontaneous combustion or explosions.
A: Vertical mills are relatively sensitive to metallic foreign objects, such as iron parts. If the raw coal contains large pieces of metal, it can easily cause damage to the grinding rollers and grinding table liners; therefore, it is essential to install a high-efficiency iron separator upstream of the mill inlet.
A: Thanks to the use of roller-grinding technology and a sealed structural design, operational noise is typically kept below 85 dB—significantly lower than the approximately 110 dB produced by ball mills.
A: This is primarily achieved by controlling three key factors: ① Strictly controlling the mill outlet temperature (typically keeping it below 100°C); ② Maintaining a slight negative pressure within the system to prevent excessive oxygen ingress; and ③ Equipping the system with an online CO/O₂ monitoring system and a nitrogen-based fire suppression system.
A: For models equipped with a hydraulic roller-tilting mechanism, replacing a complete set of grinding rollers and liners typically takes only 8 to 12 hours, thereby significantly reducing downtime for maintenance.
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