coal handling (1) for gtu students .pptx

Gtu

1. Introduction Storage of coal Dead storage or outdoor storage (a) Stocking the coal in heaps or pile (b) Under water storage 2. Live storage or active storage

2. Introduction

3. Introduction

4. Introduction 30 to 50 km

5. Introduction

6. Transfer of coal Belt-conveyors Screw conveyor Bucket conveyor Grab bucket elevator Skip hoists Flight conveyor

7. Introduction Inclination-20° 1 to 1.8 m/s 50 to 100 tonnes/hr

8. Rotation-70 to 125 r.p.m Dia-15 to 50 cm Max. capacity-125 tonnes/hr

9. Introduction

10. Introduction

11. Unique feature of high pressure boiler

12. Advantages of high pressure boiler

13. Solid fuel firing Hand firing Mechanical firing Types of stokers Overfeeding Underfeeding Principle of overfeed stockers A layer of fresh or green coal-fresh coal zone A layer of coal losing moisture-drying zone A coking layer of coal losing its volatile content-distillation zone A layer of incandescent coke where the fixed carbon is consumed-combustion zone A layer of ash getting cooler-ash zone

14. Characteristic of LA MONT boiler

15. Types of overfeed stokers Travelling grate stocker (a) chain grate type (b) bar grate type Spreader stockers

16. 1 Rate of burning-200 to 300 kg/m³ per hr

17. Introduction Boiler size-155 to 265 KW

18. Principles of underfeed stockers Types of underfeed stocker Single retort stocker Multi-retort stocker

19. Introduction

20. Introduction Coal feeding capacity-100 to 2000 kg/hr

21. Introduction No. of retort-2 to 20 Coal feeding capacity-300 to 2000 kg/hr per retort

22. Pulverized fuel system Pulverized fuel handling systems Unit system Central or bin system

23. Introduction

24. Introduction

25. Pulverized mills Impact mills (a) ball mill (b) hammer mill Attrition mills (a) bowl mill (b) ball and race mill

26. Introduction 10 tons of coal/hr contains 4% moisture require 28 tons of steel ball 20 to 25 KW

27. Introduction

28. Introduction

29. Introduction

30. Pulverized coal burners Long flame or U-flame or streamlined burner Short flame or turbulent burner Tangential burner Cyclone burner Oil Burners Vapouring burners Atomising burners (a) stream or high pressure air atomising burners (b) mechanical burners

31. Introduction

32. Introduction

33. Introduction

34. Introduction

35. Introduction

36. Introduction

37. Introduction

38. Introduction

39. Introduction

40. Introduction

41. Introduction

42. Introduction

43. Introduction

44. Introduction

45. Thank you