SMS Concast - Brasil Seminário ABM – Maio 2012 Summary Slide Layout ● Mechanical Vacuum Pump • 3-Stage Mechanical Vacuum Pump With Steam Ejectors and Condensers With Mechanical Vacuum Pumps • Mechanical Vacuum Pump Configuration Vacuum System Configuration • Mechanical Vacuum Pumps – Blowers / Compressors Vacuum Bag Filter Design • Main Technical Data 5-Stage Steam Ejector Pumps ● Mechanical Pump Applications • Main Data Comparison • Operating Costs History Market Situation for Mechanical Pumps Results Hydrogen Removal Desulphurisation Electric Energy Consumption Final Vacuum Pressure Cost Comparison ● Reference Projects ● Recent References Vacuum Plant Layout – With Steam Ejectors and Condensers 6 B 7 8 5-Stage Steam Ejectors Pumps AC SE5a SE5b ● 6 Steam Ejectors C2 ● 2 Steam Condensers ● Steam flowrate 6.5 tph SE4a ● Water flowrate 358 m3/h @ 35 °C in C1 ● < 5 min pump-down time SE3 ● Final operating pressure 0.5 torr SE2 SE1 Vacuum Plant Layout – With Mechanic Vacuum Pumps General Vacuum System Design Configuration VD Tank Vacuum Bag Filter ● One fixed Vacuum Tank ● One Vacuum Filter ● One Vacuum Pump Mechan. Vacuum Pumps 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 VOD Layout with Mechanic Vacuum Pumps VOD Layout with Mechanic Vacuum Pumps Hydrogen Removal HYDROGEN REMOVAL ORI MARTIN VD 75, Unfiltered Data 10.0 Hinit, ppm Hfinal, ppm 9.0 H Content, ppm (HYDRIS) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 1278 1539 1540 1591 2158 2404 2451 2837 2860 2861 2876 2898 2964 2985 2986 3006 3092 3137 3657 Heat # ● Time at < 1.33 hPa 10-14 min. ● Hydrogen contents of 1.5/2.0 ppm can easily be achieved Desulphurisation DESULPHURISATION inVD ORI MARTIN VD 75, Unfiltered Data 0.040 Initial S content 0.020-0.030 % Sinit, % SafterVD, % 0.035 S Content After VD, % 0.030 0.025 0.020 0.015 0.010 0.005 13 90 14 25 15 14 15 40 15 91 16 59 16 80 16 95 17 64 17 87 18 09 18 99 21 36 24 27 25 29 28 60 28 77 28 99 29 65 30 06 30 70 30 92 36 39 36 74 37 68 0.000 Heat # • Initial S 0.020-0.030 % with some peaks Final S 0.001-0.006 % without Ca treatment Electric Energy Consumption Energy Consumption Mechanical Vacuum Pump ORI MARTIN VD 75 Energy Consumption, kWh/tonne 1.0 0.8 0.6 0.4 0.2 0.0 0 5 10 15 20 Vacuum Time, minutes • 0.5-0.9 kWh/t for 22 minutes degassing time 25 30 Final Vacuum Pressure Final Vacuum Pressure ORI MARTIN VD 75 1.00 0.90 Final Pressure, mbar 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 Heat # • Typical final vacuum pressure 0.3-0.4 hPa 187 181 175 169 158 152 146 140 134 128 122 116 106 91 85 78 72 58 52 46 40 34 28 22 14 7 1 0.00 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 Mechanical Vacuum Pump Configuration Suction 2nd Stage 1st Stage 3rd Stage ● 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 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 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 < 1.6 kWh/tonne ● Pump-down time < 4 min ● Final operating pressure 0.5 hPa ( 0.4 torr) Main Technical Data Comparison Vacuum Pump type Steam Ejector Pump Mechanical Vacuum Pump 5-120 SE M-47 Vacuum pump suction capacity at 0.5 torr 120 kg/h 55’750 m3/h = 47 kg/h DAE Water flowrate 358 m3/h 5.5 m3/h Steam consumption 6.5 tph - Final operating pressure 0.4 torr 0.4 torr Final vacuum against closed shutoff valve < 0.2 torr < 0.05 torr Pump-down time to 1.0 torr < 5 min < 4 minutes Electric energy consumption 2 kW/tonne (WTP) < 1.6 kWh/tonne COMPARISON OF OPERATING COSTS ITEM UNIT COST Cost,€/Unit MECHANICAL PUMP Spec. Consumption, Cost/tonne units/tonne 0.052 1.6 0.083 26.00 Electric Power, kWh Steam, tonne Condenser Water, m3 Machine cooling water, m STEAM EJECTOR PUMP % Spec. Consumption, Cost/tonne units/tonne 32.8 0.1 0.005 0.090 2.340 0.03 3 % 0.1 58.7 6 0.180 4.5 0.17 0.1 0.017 6.7 Nitrogen, Nm3 Lubricants, l Maintenance (SE), year Maintenance (M), year TOTAL 0.25 4.50 50'000 4'000 0.12 0.002 0.030 0.009 11.8 3.6 0.12 0.0001 0.030 0.000 1.429 0.8 0.0 35.9 0.114 45.1 0.25 100.0 € 3.98 100.0 Annual tonnage, tonnes Heat weight, tonnes 35'000 30 € Diff., €/tonne 3.73 ● Main cost difference derives from steam and cooling water ● Operating costs around 3.7 € per tonne lower with mechanical vacuum pumps MWL – START-UP PHOTOS – VD 30 TONS MWL – START-UP PHOTOS – VD 30 TONS TIANJIN IRON STEEL – START-UP PHOTOS – VD 90 TONS Others Projects of VD with Mechanical Vacuum Pumps 80-tons VD/VOD ORI MARTIN, Italy started up in 2002 75-tons VD VON MOOS, Switzerland started up in 2005 90-tons VD KARDEMIR, Turkey started up in 2007 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 EAF New Technological Highlights Melting Conso Technology • Electric Arc Furnaces UHP up 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