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Size Reduction and Size Classification of Coal
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MCT-306: Size Reduction and Size Classification of Coal Marks Theory 100, Practical 100 Credit Hours Theory 3, Practical 1 1. Comminution (crushing and grinding) (i)Comminution theories (ii)Crushing sequence (open and closed circuits)(iii)Forces operative in crushing and grinding & grinding efficiency (iv)Determination of work index (Bond index) for energy consumption in coal grinding 2. Coal Crushers (i) Types of Roll-Crushers (double roll, single roll, toothed roll, and corrugated roll) their construction, operation, sizes, capacities, efficiencies and costs (ii) Hammer and impact crushers, rotary coal breakers (iii)Comparisons of crushers in terms of capacity, types of crusher products and efficiencies (iv)Lay-out of crushing equipment 3. Grinding (i)Ball mill and Rod mill grinding (wet and dry) (ii) Theory of ball mill grinding, critical speed and operational detail (iii) Pulverizers for dry grinding of coal (iv)Coal conveying & storage 4. Industrial Sizing of Coal (i) Types of industrial screens (single, double, triple, decks) static (sieve bend) and dynamic screens (vibrating, shaking, revolving, conveying) their construction, operation and performance (efficiency) (ii)Factors affecting the performance of screens 5. Size Classification (i) Principles governing classification(ii) Centrifugal classifiers (Rake, spiral, settling cone) (iii)Mechanical classifiers (hydrocyclone, air cyclone classifiers) and their construction operational parameters, efficiency, etc 6. Safety aspects during coal grinding 7. Worked Problems (i) Calculations based on two product formula (ii) Construction of sieves from reference sieve (iii) Energy consumption calculations in comminution (iv)Calculations on screens and classifiers performance (v)Construction of roll crushers (size of rolls and capacity of roll crusher) (vi)Drawing of flowsheets for crushing/ grindings circuits |
| Credit hours/ Marks:- 4 |
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