Possible evolution of a small double-flash geothermal unit (5 MW) - - PowerPoint PPT Presentation

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Possible evolution of a small double-flash geothermal unit (5 MW) - - PowerPoint PPT Presentation

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Possible evolution of a small double-flash geothermal unit (5 MW) 28/09/2006 Bouillante 1 et 2 - Vue gnrale de la centrale > 2 28/09/2006 S parateur HP Conduite eau surchauff e venant du s parateur HP Ballon flash BP Emplacement

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Possible evolution of a small double-flash geothermal unit (5 MW)

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Bouillante 1 et 2 - Vue générale de la centrale

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28/09/2006 Séparateur HP Conduite eau surchauffée venant du séparateur HP Emplacement possible des échangeurs Ballon flash BP Bouillante 1

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Preliminary calculations done taken into account, the experience on Bouillante geothermal field (Unit GB1)

  • Hypothesis 1 : New investment for a double flash turbine
  • Hypothesis 2 : idem 1 + small binary on separated water (after HP

separator)

  • Hypothesis 3 : Single flash turbine (HP only) and larger binary cycle
  • n all the separated water available
  • Hypothesis 4 : Binary cycle unit only (no steam flash turbine)
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Option 1 4,7 MW gross power double-flash turbine

  • Contribution to initial cost of the wells : 4100 k€
  • Preliminary estimation for next revamping : 12400 k€
  • Net power output : 4 MW
  • Availability (net power) : 80 % (average year)
  • Selling price : 0,10 €/kWh
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Option 1

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Option 2 4,7 MW gross power with double-flash turbine (see option 1) + binary cycle on separated water (360 t/h high pressure water after HP separator)

  • Double-flash turbine ; same option 1
  • Binary cycle and power plant modifications :

► 6500 k€ ► 3,7 MW net output ► entry to binary : 360 t/h / 176° C ► exit from binary : 360 t/h / 115° C ► operating costs estimated to : 260 k€/year

  • Total net output : 7,7 MW
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Option 2

Option 2

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Option 3 4 MW gross power with single-flash turbine (HP only) + binary cycle on separated water (480 t/h)

  • Single-flash turbine net output : 3,5 MW
  • Binary cycle and power plant modifications :

► 6800 k€ ► 4,5 MW net output ► entry to binary : 480 t/h / 176° C ► exit from binary : 480 t/h / 115° C ► operating costs estimated to : 300 k€/year

  • Total net output : 8 MW
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Option 3

Option 3

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Option 4 Existing double-flash turbine totally replaced by a large binary power plant

  • Binary power plant investment estimated to 14000 k€

(including decomissioning of actual double-flash equipment)

  • Gross output : 7,6 MW
  • Net output : 7 MW
  • Entry to binary : 480 t/h water / 176°

C 32 t/h steam 6,5 b

  • Availability : 92 %
  • Production 56400 MWh/year, 0,10 €/kWh
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Comparison of the IRR (project) calculated after 15 years exploitation (constant money)

H4 H3 H2 H1 4,9 ans 23,66% 1730,0 4,7 ans 25,28% 1572,7 4,5ans 26,91% 1415,4 Operating costs 3 7 MW 4,1 ans 31,06% 6708,2 4,7 ans 25,28% 6098,4 5,7ans 19,73% 5488,6 Annual turn-over 2 5,3 ans 21,49% 19910,0 4,7 ans 25,28% 18100,0 4,2ans 29,09% 16290,0 Initial investment 1 4,9 ans 21,90% 1970,2 4,7 ans 23,31% 1791,1 4,6ans 24,72% 1612,0 Operating costs 3 8 MW 4,2 ans 28,52% 7954,1 4,7 ans 23,31% 7231,0 5,7ans 18,27% 6507,9 Annual turn-over 2 5,3 ans 19,82% 25410,0 4,7 ans 23,31% 23100,0 3,8ans 27,71% 20790,0 Initial investment 1 6,2 ans 17,68% 1923,2 5,9 ans 19,03% 1748,4 5,5ans 20,38% 1573,6 Operating costs 3 7,7 MW 4,9 ans 23,72% 7379,0 5,9 ans 19,03% 6708,2 6,9 ans 14,40% 6037,4 Annual turn-over 2 6,5 ans 15,92% 25630,0 5,9 ans 19,03% 23300,0 5,0 ans 22,89% 20970,0 Initial investment 1 13,0 ans 1,79% 1495,3 12 ans 3,53% 1359,4 10,5 ans 5,20% 1223,5 Operating costs 3 4 MW 9,6 ans 7,28% 3833,3 12 ans 3,53% 3484,8 0,0 ans 0,60% 3136,3 Annual turn-over 2 13,2 ans 1,53% 18150,0 12 ans 3,53% 16500,0 10,2 ans 5,88% 14850,0 Initial investment 1 RETOUR TRI Montant RETOUR TRI Montant RETOUR TRI Montant 10% 0%

  • 10%

Power (net) 2020 (15 ans)

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Hypothesis 1 New investment for a double flash turbine

3,53 % 1,53 % 5,88 % 7,28 %

  • 0,6 %

1,79 % 5,2 %

  • 8
  • 6
  • 4
  • 2

2 4 6 8

  • 10%

0% 10% Initial investment Annual turn over Operating costs

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Hypothesis 2 Idem 1 + small binary on separated water (after HP separator)

19,03 % 15,92 % 22,89 % 23,72 % 14,4 % 17,68 % 20,38 % 5 10 15 20 25

  • 10%

0% 10% Initial investment Annual turn over Operating costs

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Hypothesis 3 Single flash turbine (HP only) and larger binary cycle on all the separated water available

19,82 % 23,31 % 27,71 % 18,27 % 28,52 % 24,72 % 21,9 % 5 10 15 20 25 30

  • 10%

0% 10% Initial investment Annual turn over Operating costs

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Hypothesis 4 Binary cycle unit only (no steam flash turbine)

29,09 % 25,28 % 21,49 % 19,73 % 31,06 % 23,66 % 26,91 %

  • 3

2 7 12 17 22 27 32

  • 10%

0% 10% Initial investment Annual turn over Operating costs