coal crusher and screening plant

Coal Crusher and Screening Plant: Key Components for Efficient Coal Processing

Overview

Coal crushers and screening plants are essential equipment in coal processing, enabling the efficient size reduction and classification of raw coal for various industrial applications. These systems improve coal quality by removing impurities and ensuring uniform particle size, which is critical for combustion, coking, or further processing. This article explores the working principles, types of crushers and screens, key comparisons, and real-world applications in coal handling plants.

Types of Coal Crushers

Coal crushers are categorized based on their crushing mechanisms:

1. Jaw Crusher – Suitable for primary crushing with high capacity but limited to larger feed sizes.
2. Impact Crusher – Ideal for medium-hard coal, producing cubical-shaped output.
3. Double Roll Crusher – Effective for reducing fines generation while handling sticky or wet coal.
4. Hammer Crusher – Used for fine crushing but may generate more dust.

Comparison of Coal Crushers (Key Parameters)

Crusher Type	Feed Size (mm)	Output Size (mm)	Capacity (TPH)	Application
Jaw Crusher	150-1,200	50-300	50-1,500	Primary crushing
Impact Crusher	100-500	10-50	30-500	Secondary/tertiary crushing
Double Roll Crusher	20-200	5-30	10-300	Low-fines production
Hammer Crusher	<100	<10	5-100	Fine crushing

Coal Screening Plants

Screening separates coal into different size fractions using vibrating screens (e.g., linear motion or circular motion screens). Key screening methods include:

• Scalping: Removing oversized material before crushing.
• Classification: Sorting crushed coal into marketable sizes (e.g., lump coal, nut coal).

Case Study: Coal Processing Plant in Indonesia

A thermal power plant in East Kalimantan implemented a combination of jaw crushers (primary) and double roll crushers (secondary), along with multi-deck vibrating screens. The system improved throughput by 25% while reducing fines generation by 15%, enhancing fuel efficiency for power generation.

FAQs

1. What is the ideal crusher for high-moisture coal?

Double roll crushers are preferred due to their self-cleaning design, minimizing clogging from wet or sticky coal.

2. How often should screening panels be replaced?

Depending on abrasiveness, polyurethane panels last 6–12 months, while steel panels may require replacement every 3–6 months.

3. Can mobile crushers and screens be used in coal plants?

Yes, mobile units like Lokotrack® plants (by Metso) are deployed in smaller mines or temporary sites for flexibility.

4. What maintenance is critical for coal crushers?

Regular inspection of wear parts (liners, hammers), lubrication checks, and monitoring vibration levels to prevent breakdowns.

5. How does screening improve coal quality?

By removing undersized fines and oversized lumps, screening ensures consistent calorific value and reduces ash content in end products.

Conclusion

Selecting the right combination of crushers and screens is vital for optimizing coal processing efficiency. Real-world applications demonstrate measurable benefits in productivity and cost savings when equipment is matched to material characteristics and operational demands.