Coal fineness is critical for combustion efficiency in power plants and industrial boilers. To achieve optimal particle size distribution, specialized crushing and grinding equipment must be integrated into the production line.
1. Hammer Crusher: Pre-crushes raw coal to ≤30mm. Key parameters:
– Capacity: 50–300 TPH
– Motor Power: 110–400 kW
– Output Size: ≤5mm (adjustable)
2. Vertical Roller Mill (VRM): Grinds coal to 80% passing 200 mesh (74µm). Features:
– Grinding Pressure: 7.5–12.5 MPa
– Moisture Tolerance: ≤15%
– Energy Savings: 30–50% vs. ball mills
3. Dynamic Classifier: Ensures uniform particle distribution by rejecting oversize particles for regrinding.
A typical coal fineness improvement line includes:
– Primary crushing → Drying (if moisture >10%) → VRM grinding → Classification → Storage. Automation controls ensure consistent output.
Q1: What’s the ideal coal fineness for power plants?
A: 75–85% passing 200 mesh (74µm) for pulverized coal boilers.
Q2: How to reduce overgrinding?
A: Use a dynamic classifier and optimize VRM roller pressure.
A Indian power plant upgraded its system with a VRM + dynamic classifier, achieving:
– Fineness: 82% passing 200 mesh
– Energy savings: 40%
– Output increase: 25% (from 12 TPH to 15 TPH).
For tailored solutions, consult equipment manufacturers with process expertise.
