Limestone Powder Preparation Equipment for Power Plant Desulfurization

Introduction to Flue Gas Desulfurization (FGD) Technology

Modern coal-fired power plants rely heavily on limestone-based wet flue gas desulfurization (WFGD) systems to meet stringent emission regulations. The efficiency of SO₂ removal directly correlates with the quality of limestone powder, where particle size distribution and reactivity play decisive roles. Typically, limestone powder for WFGD requires 90% of particles to pass through 325 mesh (45μm) with optimal CaCO₃ content exceeding 90%.

Key Requirements for Desulfurization Limestone Powder

• Particle Size: D90 ≤ 44μm (325 mesh)
• Chemical Composition: CaCO₃ ≥ 90%, MgCO₃ ≤ 2%
• Moisture Content: ≤ 1% for dry systems
• Reactivity: Complete dissolution within 4 minutes in pH4 acidic solution

Critical Equipment Selection Criteria

When selecting limestone grinding equipment for power plant desulfurization, operators must evaluate:

1. Grinding Efficiency

The equipment should achieve target fineness with minimal energy consumption. Vertical roller mills typically consume 18-22 kWh/t for 325 mesh products, significantly lower than traditional ball mill systems.

2. System Reliability

Continuous operation demands equipment with:

• Wear-resistant grinding components (60HRC minimum)
• Automatic lubrication systems
• Failsafe mechanisms for power fluctuations

3. Environmental Compliance

Modern mills must integrate:

• Pulse jet bag filters with ≤20mg/Nm³ emission
• Noise control below 85dB at 1m distance
• Zero wastewater discharge designs

ZENITH’s Recommended Solutions

With over three decades of mineral processing expertise, ZENITH offers cutting-edge grinding technologies specifically optimized for power plant desulfurization applications.

1. MTW Series Trapezium Mill

Our MTW215G model demonstrates exceptional performance in limestone preparation:

• Capacity: 15-45 t/h of 325 mesh powder
• Energy Efficiency: 22% lower power consumption than industry average
• Key Innovation: Curved air duct design reduces pressure loss by 15%
• Maintenance Advantage: Quick-change modular grinding rollers (4hr replacement time)

2. XZM Ultrafine Mill

For plants requiring finer particles (D97≤5μm), our XZM268 provides:

• Precision Classification: Turbo air classifier with 99% separation efficiency
• Compact Footprint: 40% space saving versus conventional systems
• Smart Operation: PLC-based automatic fineness adjustment
• Case Study: Achieved 98.7% SO₂ removal at Guangdong Taishan Power Plant

Technical Comparison Table

System Integration Approach

ZENITH provides complete limestone preparation systems including:

1. Raw Material Handling

• Vibration feeders with metal detection
• Automatic moisture compensation
• Pre-crushing to ≤20mm

2. Grinding Process Control

• Online particle size analyzers
• AI-based production optimization
• Remote monitoring via ZENITH IoT platform

3. Product Conveyance

• Dense phase pneumatic transport
• Anti-segregation silo designs
• Automated truck loading

Why Choose ZENITH?

Our competitive advantages include:

1. Engineering Expertise

With 5 professor-level engineers and participation in 8 national standard formulations, we deliver technically superior solutions.

2. Global Support Network

30+ overseas offices ensure:

• 4-hour response time for critical issues
• Local spare parts inventory
• Onsite training programs

3. Performance Guarantee

All our desulfurization grinding systems come with:

• 12-month comprehensive warranty
• Lifetime technical support
• Guanteed production capacity

Selecting proper limestone preparation equipment significantly impacts WFGD system performance and operating costs. ZENITH’s MTW and XZM series mills offer power plants reliable, high-efficiency solutions with industry-leading technical support. Contact our engineering team today for customized system design based on your specific fuel sulfur content and emission requirements.