Overview
The desulfurization vertical mill is a specialized grinding machine designed for limestone processing in flue gas desulfurization systems. Unlike conventional mills, it integrates crushing, grinding, drying, and powder selection in one unit, making it highly efficient for power plants and industrial boilers. Developed specifically for environmental applications, these mills can handle moist limestone (up to 15% water content) and produce ultra-fine powders required for effective sulfur dioxide removal. Their vertical roller design significantly reduces energy consumption compared to traditional ball mills.
Structure and Working Principle
The mill consists of a rotating grinding table, rollers with hydraulic pressure systems, a separator, and a hot gas generator. Raw limestone is fed centrally and crushed between the rollers and table, while hot air dries the material during grinding. The ground powder is carried by air flow to the dynamic separator, where oversized particles are returned for regrinding. Fine product (typically 90% below 44μm) exits through the discharge system. The hydraulic system maintains optimal grinding pressure (50-150 bar) to ensure consistent fineness while compensating for roller wear.
Key Features
Modern desulfurization vertical mills offer 30-50% lower energy consumption than ball mills, with specific power as low as 15-25 kWh/t. Their modular design allows for compact installation, saving up to 50% space compared to alternative systems. Advanced models incorporate PLC automation for precise control of grinding pressure, temperature, and feed rate. Wear-resistant materials like nickel-hard rollers and high-chrome liners extend service life to 8,000-12,000 operating hours between major maintenance intervals.
Application Areas
Primarily used in coal-fired power plants (300MW-1000MW units), these mills supply limestone powder for wet (limestone-gypsum) and semi-dry FGD processes. They're also adopted in steel plants, cement kilns, and waste incinerators with sulfur emission controls. Some installations combine desulfurization with co-grinding of other industrial byproducts like fly ash or slag, creating value-added construction materials while meeting emission standards. The mills' adjustable fineness makes them suitable for producing fillers for paper, rubber, and plastics industries.
Maintenance and Precautions
Daily maintenance includes lubrication checks (especially for roller bearings), vibration monitoring (should remain below 2mm/s), and inspection of wear parts. Monthly tasks involve separator blade adjustment and hydraulic system testing. Critical precautions include maintaining stable feed rates (±5% variation) to prevent roller slippage, and keeping grinding temperatures below 120°C to avoid gypsum dehydration. Proper shutdown sequences must be followed to prevent material buildup that could seize the grinding table during restart.
B2B Procurement Guide
When sourcing desulfurization vertical mills, verify the supplier's experience with FGD applications—ask for reference projects with similar limestone characteristics. Key specifications to compare include: specific energy consumption, product fineness adjustability (D50 control), and availability guarantees (typically >92%). Consider total cost of ownership: while European brands may have higher upfront costs (20-30% premium), their energy efficiency and longer wear life often provide better ROI. For Asian markets, Chinese manufacturers like Sinoma and NHI offer cost-competitive options with localized service networks. Always request pilot test reports for your specific limestone sample.
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