Downloaded 38 times
More Related Content
Deaerator -thermal power plants
- 1. Stork Thermeq B.V. ® Presentation Stork ThermeqBV Start Spray-type Deaerator
- 2.
- 3. Stork Thermeq B.V. ® ApplicationConstructionGeneral Deaerating process steps (1)Principle Venting Performance Step Item 1 Spray-device 2 Steam Charging Device (SCD) 3 Vessel Function 100% heating up Partial deaeration Cooling steam to saturation temperature Steam distribution Feedwater storage (no heating up) Relief of non-condensable gases Finalization of deaeration Comparison Retrofit - Lay-out - Operation Conclusion
- 4. Stork Thermeq B.V. ® •sprayer • steam • vessel Deaerating process steps (2)Principle Venting Performance Comparison Retrofit - Operation Application ConstructionGeneral - Lay-out Conclusion
- 5. Stork Thermeq B.V. ® Requiredtemperature difference for O2 < 10 ppb 0 5 10 15 20 25 30 35 0 2 4 6 8 10 O2-content at inlet (mg/l) Temperaturedifference(°C) Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Operation - Lay-out Conclusion
- 6. Stork Thermeq B.V. ® Typicalvent-flow range upto 1200 T/H and high O2 at inlet 0 10 20 30 40 50 60 70 80 90 100 0 2 4 6 8 10 Operating pressure (bara) Ventflowpersprayer(kg/h) Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Operation - Lay-out Conclusion
- 7. Stork Thermeq B.V. ® Comparison;layout Typical layout Cascade or Spray/tray-type Deaerators Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Lay-out - Operation Conclusion
- 8. Stork Thermeq B.V. ® Comparison;layout Stork Spray-type No vent condenser One vessel: • 1 top platform • min. insulation • min. piping • easy erection • low total height • earthquake optimal Cascade Spray/tray-type Vent condenser or high losses Storage vessel + top tank: • more platforms • extended insulation • balance lines, more length • erection both tanks and piping • extra total height top tank • forces top tank to storage vessel critical for earthquake-design Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Lay-out - Operation Conclusion
- 9. Stork Thermeq B.V. ® Comparison;layout Stork Spray-type Cascade Spray/tray-type Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Lay-out - Operation Conclusion
- 10. Stork Thermeq B.V. ® Comparison;operation Stork Spray-type • heating-up with standard steamrake • operating range > 1:30 • no pressure difference in steam area Cascade Spray/tray-type • additional heating storage tank required • operating range max. 1:4 • pressure difference storage vessel and top tank at high loads Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Lay-out - Operation Conclusion
- 11. Stork Thermeq B.V. ® Comparison;operation Stork Spray-type • water saturated with rising pressure; easy control • simple pressure control • rate pressure decrease limited by NPSH feedwater pump Cascade Spray/tray-type • water subcooled with rising pressure; sensitive control • pressure control + feedforward • rate pressure decrease is a critical item in design top tank Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Lay-out - Operation Conclusion
- 12. Stork Thermeq B.V. ® Retrofitspray-tray to Stork design Stork Spray-type Deaerator after retrofit Cascade-type Deaerator before retrofit Application ConstructionGeneral Principle Venting Performance Comparison Retrofit - Operation - Lay-out Conclusion
- 13. Stork Thermeq B.V. ® MediaMedia Conventional HRSG Ranges Vacuum Flowto be deaerated Heat supply to deaerator condensate / feedwater make-up / demin. water superheated steam saturated steam wet steam (.. 90 %) steam/water mixture (.. 1% steam) hot water (flashing in internals) Application ConstructionGeneral Conclusion
- 14. Stork Thermeq B.V. ® Ranges Pressure0.2 – 1.0 bara Vacuum to 1.3 bara 1.2 – 20 bara Overpressure Capacity 2 – 120 T/H Type DN150; spring 7 – 450 T/H Type DN250; spring 60 – 660 T/H Type 600; disc 120 – 1320 T/H Type 1200; disc 600 – 6000 T/H 5x type 1200; disc Diameter 1.6 – 5.0 m Normal range Length Limits of workshop Site assembly possible Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 15. Stork Thermeq B.V. ® Stork FromCR Bypass operation Condensate To HP- heaters Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 16. Stork Thermeq B.V. ® DeaeratorLP-drum Condensate / make-up water To drum HRSG Economizer Heat source: Water / steam mixture LP- Steam Natural / forced circulation Evaporator Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 17. Stork Thermeq B.V. ® Deaerationby ECO-water LP- Steam = 0 Condensate / make-up water To drum HRSG Economizer Heat source: Hot Eco-water Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 18. Stork Thermeq B.V. ® Vacuumoperation with gas Condensate / make-up water To drum HRSG LP- Steam = 0 60 °C Gas fired Economizer Heat source: Steam / Hot Eco-water Vacuum venting Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 19. Stork Thermeq B.V. ® Overpressurewith oil Condensate / make-up water To drum HRSG LP- Steam supply 135 °C Oil fired Economizer Heat source: Steam / Hot Eco-water Application ConstructionGeneral Media Conventional HRSG Ranges Vacuum Conclusion
- 20. Stork Thermeq B.V. ® MaterialselectionMaterial Sprayers Internals PWHT • Vessel • Steam charging device • Flow baffles • Spray baffle • Sprayer Carbon steel Carbon steel (principal) Stainless steel (erosion, high water content) Carbon steel Carbon steel Stainless steel Application ConstructionGeneral Conclusion
- 21. Stork Thermeq B.V. ® PostWeld Heat Treatment Quality Saving on maintenance costs Code requirement Dependent on wallthickness Optimal measure against cracking based on worldwide experience NACE, VGB, S42 Client requirement Obligation Stork advice Relevant standards Application ConstructionGeneral Materials Sprayers Internals PWHT Conclusion
- 22. Stork Thermeq B.V. ® Disctype Spring type Application ConstructionGeneral Materials Sprayers Internals PWHT Conclusion
- 23. Stork Thermeq B.V. ® Disctype Spring type (new) Application ConstructionGeneral Materials Sprayers Internals PWHT Conclusion
- 24. Stork Thermeq B.V. ® Large baffle Small baffle Vortex beakerSpray baffle Standarddesign: Y-type steamrake Alternative & combination A / H type Application ConstructionGeneral Materials Sprayers Internals PWHT Stork deaerator Conclusion
- 25. Stork Thermeq B.V. ® Storkspray-type Deaerators Attractive prices Flexible design, minimum height Minimize the maintenance budget Satisfaction on your decision for years and years Investing in deaerators you want
- 26. Stork Thermeq B.V. ® Endof Presentation Stork Thermeq BV End