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Steam turbine generator maintenance for sugar mills

Steam turbine generator maintenance for sugar mills: generator overhaul between harvests. Diagnostics, repair and rewinding.

Published · 66.8 seconds · English and Spanish captions

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Short answer

When is steam turbine generator maintenance scheduled at a sugar mill?

At a sugar mill, bagasse fires the boiler and steam drives the turbine that turns the turbogenerator. The narration uses a four-pole generator delivering 60 hertz at 1,800 revolutions as an example, running through the harvest and repaired between harvests. TEMISA Power Gen diagnoses, repairs and rewinds the turbogenerator. The boiler and the steam turbine are coordinated with the plant's specialist. Published service covers generators from 1 to 365 MVA; the nameplate sets the rating of each unit.

Video transcript

Download captions (.srt)
  1. 00:00

    This sugar mill powers

  2. 00:01

    itself with its own

  3. 00:02

    waste.

  4. 00:03

    For every hundred tons

  5. 00:04

    of cane it crushes,

  6. 00:05

    almost 30 tons of

  7. 00:06

    bagasse are left over.

  8. 00:08

    So how does it

  9. 00:08

    turn that into

  10. 00:09

    electricity?

  11. 00:10

    The mills squeeze the

  12. 00:12

    cane and extract the

  13. 00:13

    juice.

  14. 00:14

    The leftover bagasse

  15. 00:15

    travels to the boiler

  16. 00:15

    where it burns.

  17. 00:17

    That fire boils the

  18. 00:18

    water running through

  19. 00:19

    hundreds of tubes and

  20. 00:20

    turns it into

  21. 00:21

    high-pressure steam at

  22. 00:22

    more than 300 degrees.

  23. 00:24

    The steam enters the

  24. 00:25

    turbine and pushes row

  25. 00:27

    after row of blades,

  26. 00:28

    spinning at thousands

  27. 00:29

    of revolutions per

  28. 00:30

    minute.

  29. 00:31

    And once again the

  30. 00:32

    gearbox shows up.

  31. 00:33

    The reducer brings the

  32. 00:34

    speed down to 1,800

  33. 00:35

    for a four-pole

  34. 00:36

    generator that

  35. 00:37

    delivers 60 Hertz.

  36. 00:38

    The steam leaving the

  37. 00:40

    turbine is not wasted.

  38. 00:41

    It goes to the

  39. 00:41

    factory to heat and

  40. 00:43

    evaporate the juice.

  41. 00:44

    That is cogeneration.

  42. 00:46

    The same principle

  43. 00:46

    drives geothermal

  44. 00:47

    plants like Cerro

  45. 00:48

    Prieto in Baja

  46. 00:49

    California where the

  47. 00:50

    steam comes from the

  48. 00:51

    earth.

  49. 00:52

    At the mill,

  50. 00:53

    the generator runs day

  51. 00:54

    and night for the

  52. 00:55

    whole harvest and gets

  53. 00:56

    repaired between

  54. 00:57

    harvests.

  55. 00:58

    At TEMISA Power Gen,

  56. 00:59

    we diagnose,

  57. 01:00

    repair and rewind

  58. 01:01

    turbogenerators.

  59. 01:03

    Get a quote at

  60. 01:04

    temisapowergen.mx

Questions from plant owners

What is a sugar-mill steam turbine generator overhaul?

It is the generator intervention in the window between harvests. The narration describes a generator that runs day and night through the harvest and is repaired between harvests. Scope can include diagnostics, repair and rewinding.

Does the service include the boiler or the steam turbine?

The scope is the turbogenerator, the electrical machine. The boiler, the steam and the turbine are coordinated with the plant's specialist.

Does the four-pole, 1,800-revolution example apply to every mill?

It is the narration's example: a four-pole generator delivering 60 hertz at 1,800 revolutions. Speed, pole count and rating for your unit are on the nameplate.

What rating is in scope?

Published generator service covers 1 to 365 MVA. The nameplate states the actual rating. A quote needs manufacturer, MVA, voltage, rpm, site, harvest end and the available window.

About the figures: Figures in the narration and in the on-screen graphics illustrate the example in the video. They are not the nameplate of a serviced generator and they are not acceptance limits.

About the footage: The video is an explainer animation. It does not document work on a customer's machine and it does not show a serial number.

Narration of the TEMISA Power Gen explainer video.