INFORME DE LABORATORIO DE TECNOLOGIA DEL CONCRETODescripción completa
Teste, for wear rate in Vertical Loesche MillsFull description
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Loesche Technical Seminar for Cement Grinding PlantFull description
Loesche Technical Seminar for Cement Grinding PlantFull description
Technical status of roller mill type Loesche Year 1941 in German languageFull description
Teste, for wear rate in Vertical Loesche Mills
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09.00 Daniel Strohmeyer, Loesche GmbHFull description
erwerFull description
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Round MidnightFull description
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Christmas in the RoundFull description
Performance of Vertical Roller Mills at Bharathi Cement Corporation Pvt. Ltd., Nallalingayapalli Olivier Thomas Performance Director
Technical Configuration Line #1 – Commissioning in September 2009: - LM 54.6 for raw mix grinding. - LM 26.3 for coal grinding. - LM 63 3+3 for clinker grinding.
Line #2 - Commissioning in February 2011: - LM 54.6 for raw mix grinding. - LM 26.3 for coal grinding. - LM 53 3+3 for clinker grinding – 2 units.
- Budget of 2.46 M Tons Cement of dispatch in 2012. - A-Grade Cement positioned on the south Indian market and MH. - Cement Ratio OPC : PPC : PSC = 45 : 55 : 5. - PPC with an addition of 27 – 28% of fly ash. - Consumption of Indian, Indonesian, SA coal and petcoke (6% sulphur content) - Usage of secondary fuels – Up to 10% substitution rate (wood chips and pharmaceutical wastes). Loesche India Round Table 2012
Commissioning Phase Focus Point – LM 53 3+3 – Successful Learning Curve Think, Study, Feel, Measure and Observe – Start-up to nominal capacity in 45 days Phase #1 – Start-Up: • Ensure a thorough cold commissioning and testing – Control management pressure to delay the start-up if necessary. • Work up properly all pre-conditions between parties, especially regarding clinker C3S, temperature and content of additives. • Make sure commissioning engineers have a dedicated operating station. • Start the mill in complete ‘manual’ mode. Set a lower fineness target Objective to observe and feel the mill.
• Adjust hydraulic settings accordingly after this first phase to ensure a “sustainable” capability of successful start-up when pressing the ‘start’ button for the next times.
• Proceed with frequent in-the-field inspections with Loesche’s commissioning engineers.
Commissioning Phase Phase #2 – Observe & Feel: We are entering a testing phase to determine if the mill can respond to our demand Increase material output and achieve fineness. • Increase grinding pressure If main motor kW do not increase, material is being flushed out of the table by the rollers. It is a way to determine if the dam ring height is adapted. • Increase grinding pressure dP (mill) is decreasing since we are grinding faster and more finer particles are leaving the system faster than coarser particles. • Optimize total air volume so that rejects stay at a minimum. • Determine if sudden dP variations are linked to a change in the clinker quality (granulometry and/or temperature) Do not fight it!
• A lower draft (or total flow) increases the efficiency of the separator Never overlook this aspect. Loesche India Round Table 2012
• Measure fineness after a few hours Adjust grinding pressure and draft. Keep in mind: Rollers and grinding pressure give Blaine. Separator gives rejects.
Commissioning Phase Performance – Conversion Factor Compare to supplier’s specification
Clinker Grinding: Expected Output (t/h) = Nominal Output / (Targeted Blaine / Original Blaine) ^ 1.4 Formula can be applied to power consumption (or at motor shaft only) e.g. LM 53 3+3 in OPC at 3,200 Blaine. Specification = 230 t/h at 3,000 Blaine and 25.4 kWh/Ton Cement. Expected Output = 230 / (3,200 / 3,000)^1.4 = 210 t/h. Expected Power Consumption = 25.4 * (3,200 / 3,000)^1.4 = 27.8 kWh/Ton Cement.
See next slide for Polysius conversion factor. e.g. LM 56.4. Specification = 21.85 kWh/T at R90µ = 14% or R212µ = 2%. Expected Power Consumption at R90µ = 19% Nominal Value * (1.04 / 1.14). (See next slide)
Commissioning Phase Performance – Control Loop Clinker Grinding: 1.Recirculation Damper Position = f (Mill Inlet Pressure). 2.Feed Rate = f (Mill Differential Pressure). 3.Booster Fan Speed = f (Mill Outlet Temperature). 4.Draft Fan Speed = f (Total Air Flow). Water injection does not control mill outlet temperature for a cement mill (not simply manageable).
1.Recirculation Damper Position = f (Mill Inlet Pressure). 2.Feed Rate = f (Mill Differential Pressure). 3.Water Injection = f (Mill Outlet Temperature) See control philosophy between ‘table’ and ‘top section injection’. 4.Draft Fan Speed = f (Total Air Flow). 5.Baghouse Inlet Damper = f (Draft Fan Outlet Pressure).
CM2/CM3 LSKS 87 Rotor Circonferential Velocity Motor
Motor power
Performance Improvement Bharathi - CM2/CM3 - Specific Grinding Pressure (1 Roller): kN kN kg kN kN/m2 m2
Mr Operational pressure Counter pressure Dcyl Drod Cylinder number per roller Roller diameter Roller width A (projected) Fr Fh F Kt Loesche maximum value
Performance Improvement Operation of vertical mills for clinker grinding: 1. Performances are achieved in a reliable manner. 2.Increase of mill output is noticeable during longer operational runs. 3.‘Specific Power Consumption’ has decreased (expect 1 to 2 kWh/Ton Cement). 4.Rejects below 45 µm and [3 – 30]µm range
are consistent and there is room for
adjustment with the separator Check water demand on a regular basis. 5.‘LM 53 3+3’ operates with stability and is to be considered as a good system when analyzed thoroughly and operated properly. 6.Water injection remains too high (3.5% of total mill output) and needs to decrease to 2.5%. 7.Hardfacing on the rollers and table remains an expensive maintenance operation.
9.Optimization of clinker granulometry and temperature is also part of getting the best out of a ‘LM 53 3+3’.
