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52 Flue gas stack sizing

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Industrial Water Tube Boiler Design
This chapter is in the book Industrial Water Tube Boiler Design
52 Flue gas stack sizingSteel stacks are cylindrical in shape and are supported on foundation. To supplygreater stability and flue gases easily, entrance must be widened in the lower por-tion of steel stack. The widened section decreases stresses on the steel in the base.Manufacturers design higher stack to decrease emission of flue gases. Stack heightdepends on the required draft.When gases are heated, they expand and volume of gases increases. Pressure ofgases will be lower ambient air pressure, then this difference results in the flow ofthe flue gases up the stack [32].The steel chimneys are of two types:–Self-supporting steel chimneys–Guyed steel chimneysIn this book, calculations are based on self-supporting stack.Flue gas stack sizing will be calculated by the following sequence:–Flue gas stack diameter–Flue gas stack height and active heightFig. 52.1:Chimney installation type [32].https://doi.org/10.1515/9783110757088-052
© 2021 Walter de Gruyter GmbH, Berlin/Boston

52 Flue gas stack sizingSteel stacks are cylindrical in shape and are supported on foundation. To supplygreater stability and flue gases easily, entrance must be widened in the lower por-tion of steel stack. The widened section decreases stresses on the steel in the base.Manufacturers design higher stack to decrease emission of flue gases. Stack heightdepends on the required draft.When gases are heated, they expand and volume of gases increases. Pressure ofgases will be lower ambient air pressure, then this difference results in the flow ofthe flue gases up the stack [32].The steel chimneys are of two types:–Self-supporting steel chimneys–Guyed steel chimneysIn this book, calculations are based on self-supporting stack.Flue gas stack sizing will be calculated by the following sequence:–Flue gas stack diameter–Flue gas stack height and active heightFig. 52.1:Chimney installation type [32].https://doi.org/10.1515/9783110757088-052
© 2021 Walter de Gruyter GmbH, Berlin/Boston

Chapters in this book

  1. Frontmatter I
  2. Contents IX
  3. 1 Introduction 1
  4. 2 Input data 6
  5. 3 Boiler heat duty 8
  6. 4 Required fuel 9
  7. 5 Forced draft fan discharge mass flow 10
  8. 6 FD: Fan outlet duct design 17
  9. 7 FD.Fan outlet duct pressure loss 19
  10. 8 Furnace width and length 21
  11. 9 Furnace height 25
  12. 10 Furnace volume 31
  13. 11 Furnace exit temperature 32
  14. 12 Combustion nonluminous heat transfer coefficient 41
  15. 13 Combustion convection heat transfer coefficient 42
  16. 14 Combustion outside heat transfer coefficient 45
  17. 15 Average tube metal temperature 46
  18. 16 Furnace draft pressure drop 52
  19. 17 Boiler design pressure 56
  20. 18 Superheater package 58
  21. 19 Superheater tube rows and deep number 60
  22. 20 Superheater convective heat transfer coefficient prediction 62
  23. 21 Superheater uncontrolled outlet steam temperature prediction 66
  24. 22 Superheater flue gas draft pressure drop 73
  25. 23 Superheater package total steam pressure drop 75
  26. 24 Steam and mud drum sizing 81
  27. 25 Bank tube average length 89
  28. 26 Bank tube heat duty prediction 92
  29. 27 Bank tube heat surface prediction 94
  30. 28 Steam drum outlet steam temperature 99
  31. 29 Bank tube bundle flue gas draft pressure drop 106
  32. 30 Bank tube duct flue gas draft pressure drop 108
  33. 31 Bank tube total flue gas draft pressure drop 112
  34. 32 Bank tube area length 113
  35. 33 Furnace area length 114
  36. 34 Boiler exit duct flue gas draft pressure drop 115
  37. 35 Bank tube bundle water pressure drop 117
  38. 36 Front and rear wall headers sizing 119
  39. 37 Steam drum to superheater connection header sizing 122
  40. 38 Economizer heat duty prediction 125
  41. 39 Economizer tube rows deep no. 126
  42. 40 Economizer tube arrangement 129
  43. 41 Economizer tube solid or serrated fins 130
  44. 42 Economizer convection heat transfer coefficient 133
  45. 43 Economizer overall heat transfer coefficient 139
  46. 44 Economizer tubes row number 142
  47. 45 Economizer package performance 144
  48. 46 Economizer headers water pressure drop 147
  49. 47 Economizer tube bundle water pressure drops 150
  50. 48 Economizer package water pressure drop 152
  51. 49 Economizer package flue gas draft pressure drops 153
  52. 50 Economizer outlet duct flue gas draft pressure drops 156
  53. 51 Circulation ratio 158
  54. 52 Flue gas stack sizing 170
  55. 53 Flue gas stack net available draft 173
  56. 54 Stack outlet flue gas temperature 175
  57. 55 Stack outlet flue gas velocity 179
  58. 56 Stack insulation thickness 180
  59. 57 Force draft fan electric driver 181
  60. 58 Pressure safety valve sizing 185
  61. 59 Desuperheater water 191
  62. 60 Boiler efficiency 192
  63. 61 Boiler package water weight 196
  64. 62 Boiler package water weight 203
  65. 63 Boiler holdup time (retention time) 205
  66. 64 Steam and mud drum weight 212
  67. 65 Furnace total tube number 214
  68. 66 Boiler total tube number 215
  69. 67 Furnace total tubes weight 216
  70. 68 Front and rear wall header weight 218
  71. 69 Superheater package weight 219
  72. 70 Steam drum to superheater connection header weight 221
  73. 71 Bank tube package weight 222
  74. 72 Economizer package weight 223
  75. 73 Stack weight 226
  76. 74 Reports 227
  77. References 241
  78. Index 243
Readers are also interested in:
https://doi.org/10.1515/9783110757088-052

Chapters in this book

  1. Frontmatter I
  2. Contents IX
  3. 1 Introduction 1
  4. 2 Input data 6
  5. 3 Boiler heat duty 8
  6. 4 Required fuel 9
  7. 5 Forced draft fan discharge mass flow 10
  8. 6 FD: Fan outlet duct design 17
  9. 7 FD.Fan outlet duct pressure loss 19
  10. 8 Furnace width and length 21
  11. 9 Furnace height 25
  12. 10 Furnace volume 31
  13. 11 Furnace exit temperature 32
  14. 12 Combustion nonluminous heat transfer coefficient 41
  15. 13 Combustion convection heat transfer coefficient 42
  16. 14 Combustion outside heat transfer coefficient 45
  17. 15 Average tube metal temperature 46
  18. 16 Furnace draft pressure drop 52
  19. 17 Boiler design pressure 56
  20. 18 Superheater package 58
  21. 19 Superheater tube rows and deep number 60
  22. 20 Superheater convective heat transfer coefficient prediction 62
  23. 21 Superheater uncontrolled outlet steam temperature prediction 66
  24. 22 Superheater flue gas draft pressure drop 73
  25. 23 Superheater package total steam pressure drop 75
  26. 24 Steam and mud drum sizing 81
  27. 25 Bank tube average length 89
  28. 26 Bank tube heat duty prediction 92
  29. 27 Bank tube heat surface prediction 94
  30. 28 Steam drum outlet steam temperature 99
  31. 29 Bank tube bundle flue gas draft pressure drop 106
  32. 30 Bank tube duct flue gas draft pressure drop 108
  33. 31 Bank tube total flue gas draft pressure drop 112
  34. 32 Bank tube area length 113
  35. 33 Furnace area length 114
  36. 34 Boiler exit duct flue gas draft pressure drop 115
  37. 35 Bank tube bundle water pressure drop 117
  38. 36 Front and rear wall headers sizing 119
  39. 37 Steam drum to superheater connection header sizing 122
  40. 38 Economizer heat duty prediction 125
  41. 39 Economizer tube rows deep no. 126
  42. 40 Economizer tube arrangement 129
  43. 41 Economizer tube solid or serrated fins 130
  44. 42 Economizer convection heat transfer coefficient 133
  45. 43 Economizer overall heat transfer coefficient 139
  46. 44 Economizer tubes row number 142
  47. 45 Economizer package performance 144
  48. 46 Economizer headers water pressure drop 147
  49. 47 Economizer tube bundle water pressure drops 150
  50. 48 Economizer package water pressure drop 152
  51. 49 Economizer package flue gas draft pressure drops 153
  52. 50 Economizer outlet duct flue gas draft pressure drops 156
  53. 51 Circulation ratio 158
  54. 52 Flue gas stack sizing 170
  55. 53 Flue gas stack net available draft 173
  56. 54 Stack outlet flue gas temperature 175
  57. 55 Stack outlet flue gas velocity 179
  58. 56 Stack insulation thickness 180
  59. 57 Force draft fan electric driver 181
  60. 58 Pressure safety valve sizing 185
  61. 59 Desuperheater water 191
  62. 60 Boiler efficiency 192
  63. 61 Boiler package water weight 196
  64. 62 Boiler package water weight 203
  65. 63 Boiler holdup time (retention time) 205
  66. 64 Steam and mud drum weight 212
  67. 65 Furnace total tube number 214
  68. 66 Boiler total tube number 215
  69. 67 Furnace total tubes weight 216
  70. 68 Front and rear wall header weight 218
  71. 69 Superheater package weight 219
  72. 70 Steam drum to superheater connection header weight 221
  73. 71 Bank tube package weight 222
  74. 72 Economizer package weight 223
  75. 73 Stack weight 226
  76. 74 Reports 227
  77. References 241
  78. Index 243
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