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Advanced Vacuum Technology for Efficient Steel Degassing

Explore the latest vacuum technology for steel degassing, including steam ejectors and mechanical pumps. Learn about hydrogen removal, desulphurization, energy consumption, and operating costs. Discover vacuum system configurations and plant layouts, with a focus on results and market situations. This seminar provides insights into improving the final vacuum pressure and reducing costs in steel production processes. Stay informed about the latest advancements in steel degassing technology.

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Advanced Vacuum Technology for Efficient Steel Degassing

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  1. SMS Concast - Brasil Seminário ABM – Maio 2012

  2. Summary Slide • Layout • With Steam Ejectors and Condensers • With Mechanical Vacuum Pumps • Vacuum System Configuration • Vacuum Bag Filter Design • 5-Stage Steam Ejector Pumps • Mechanical Pump Applications • History • Market Situation for Mechanical Pumps • Results • Hydrogen Removal • Desulphurisation • Electric Energy Consumption • Final Vacuum Pressure • Mechanical Vacuum Pump • 3-Stage Mechanical Vacuum Pump • Mechanical Vacuum Pump Configuration • Mechanical Vacuum Pumps – Blowers / Compressors • Main Technical Data • Cost Comparison • Main Data Comparison • Operating Costs • Reference Projects • Recent References

  3. 6 7 8 B Vacuum Plant Layout – With Steam Ejectors and Condensers

  4. AC SE5a SE5b C2 SE4a C1 SE3 SE2 SE1 5-Stage Steam Ejectors Pumps • 6 Steam Ejectors • 2 Steam Condensers • Steam flowrate 6.5 tph • Water flowrate 358 m3/h @ 35 °C in • < 5 min pump-down time • Final operating pressure 0.5 torr

  5. Vacuum Plant Layout – With Mechanic Vacuum Pumps

  6. VD Tank Vacuum Bag Filter Mechan.Vacuum Pumps General Vacuum System Design Configuration • One fixed Vacuum Tank • One Vacuum Filter • One Vacuum Pump

  7. Vacuum Bag Filter Design • SMS CONCAST State-of-the-art pollution control technology • Single filter sufficient for VD • Reverse jet cleaning with inert gas • Filter pressure drop < 0.1 hPa

  8. VOD Layout with Mechanic Vacuum Pumps

  9. VOD Layout with Mechanic Vacuum Pumps

  10. Hydrogen Removal • Time at < 1.33 hPa 10-14 min. • Hydrogen contents of 1.5/2.0 ppm can easily be achieved

  11. Desulphurisation • Initial S 0.020-0.030 % with some peaksFinal S 0.001-0.006 % without Ca treatment

  12. Electric Energy Consumption • 0.5-0.9 kWh/t for 22 minutes degassing time

  13. Final Vacuum Pressure • Typical final vacuum pressure 0.3-0.4 hPa

  14. 3-Stage Mechanical Vacuum Pump • 3 Stages • Identical, parallel modules • Each module consists of roots blowers and 1 screw compressor • Required suction capacity determines number of modules • Easily expandable • No stand-by costs

  15. Suction 1st Stage 2nd Stage 3rd Stage Mechanical Vacuum Pump Configuration • Machines mounted on common frame • Minimum inter-stage ducting • Compact installation – minimized civil works • Joint Concast-Edwards vacuum pump concept developed - steel degassing • Spare pumps available in England for shipping within 48 hrs • Edwards local service workshop in Bairro do Limão, Sao Paulo, Brazil

  16. Mechanical Vacuum Pumps – Blowers/Compressors Roots blower in 1st and 2nd stages • Double-ended screw compressor in 3rd stage • Progressive-pitch screws minimise thermal stresses

  17. Mechanical Vacuum Pump 2- module mechanical vacuum pump • Suction capacity 47 kg/h dry air @ 0.67 hPa, 20 °C • Cooling water 6 m3/h • Installed power 350 kW • Nitrogen purging 4.1 Nm3/h • Electric energy consumption VD< 1.6kWh/tonne • Pump-down time < 4 min • Final operating pressure 0.5hPa ( 0.4 torr)

  18. Main Technical Data Comparison

  19. COMPARISON OF OPERATING COSTS • Main cost difference derives from steam and cooling water • Operating costs around 3.7 € per tonne lower with mechanical vacuum pumps

  20. MWL – START-UP PHOTOS – VD 30 TONS

  21. MWL – START-UP PHOTOS – VD 30 TONS

  22. TIANJIN IRON STEEL – START-UP PHOTOS – VD 90 TONS

  23. Others Projects of VD with Mechanical Vacuum Pumps 80-tons VD/VOD ORI MARTIN, Italy started up in 2002 75-tons VDVON MOOS, Switzerlandstarted up in 2005 90-tons VDKARDEMIR, Turkeystarted up in 2007

  24. Others VD/VOD References Plants • Riva Lesegno, Italy - 80-tonne, VD - single tank with SE pump • ORI Martin, Italy, 80-tonne, VOD - double tank with M. pump • Gerdau Pinda, Brazil, VD - 100-tonne, revamping SE pump • Cogne, Italy, VD - 70-tonne, single tank with SE pump • Von Moos, Switzerland, VD - 75-tonne, double tank with M. pump • Kardemir, Turkey, VD - 90-tonne, double tank with M. pump • Riva Caronno, Italy, VD - 80-tonne, double tank with M. pump • MWL, Brazil, VD - 35-tonne; single tank with M. pump • Peiner Träger, Germany, VD – 100-tonne, double tank with M. pump • Tianjin Iron Steel, China , VD - 90 tonne, double tank with SE pump • Vallourec & Sumitomo, Brazil, VD - 140-tonne, double tank with M. pump

  25. EAF New Technological Highlights Melting Conso Technology • Electric Arc Furnaces UHPup to 270 t (AC + DC) • Electrical energy down to 200 kWh/t • Electrode graphite consumption down to 0.92 kg/t (good billets/blooms) Enhanced Slag Door

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