Coal crushers are essential equipment in coal processing plants, used to reduce the size of coal for efficient combustion or transportation. There are several types of coal crushers, each designed for specific applications based on hardness, moisture content, and required output size. Below is a detailed description of the main types:
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1. Primary Coal Crushers
Used for initial size reduction of large coal chunks (up to 1.5 meters) into smaller pieces (6-12 inches).
# a) Jaw Crusher
– Description: Uses two vertical jaws—one fixed and one moving—to crush coal by compression.
– Advantages: Simple structure, high reliability, suitable for hard and abrasive coals.
– Disadvantages: Less efficient for wet or sticky coal; produces irre.jpg)
arly sized output.
– Applications: Primary crushing in mines and power plants.
# b) Gyratory Crusher
– Description: Consists of a conical head inside a concave bowl; crushes coal by gyrating motion.
– Advantages: Higher capacity than jaw crushers, continuous operation.
– Disadvantages: More complex and expensive; requires high maintenance.
– Applications: Large-scale mining operations with high throughput needs.
2. Secondary Coal Crushers
Used to further reduce coal size (from 6 inches to below 2 inches).
# a) Impact Crusher
– Description: Uses hammers or blow bars to strike coal at high speed, breaking it by impact force.
– Types:
– Horizontal Shaft Impact (HSI) Crusher – Hammers rotate horizontally.
– Vertical Shaft Impact (VSI) Crusher – Rotor throws coal against anvils or liners.
– Advantages: Produces uniform cubical particles; good for softer coals.
– Disadvantages: High wear on hammers; not ideal for hard or abrasive coals.
# b) Hammer Mill Crusher
– Description: Rotating hammers strike coal against breaker plates, pulverizing it into fine particles (<20 mm).
– Advantages: High reduction ratio; adjustable output size via screen changes.
– Disadvantages: High wear rate; generates more fines (dust).
3. Tertiary & Fine Coal Crushers
Used for final crushing to produce very fine coal (below