Competence in cement - Gebr. Pfeiffer SE

PFEIFFER MVR mill –the optimum machine forgrinding high throughput ratesThe solution to your problemIn the cement industry, MVR rollermills are used for grinding cement rawmaterial, cement clinker, granulatedblast-furnace slag, and pozzolana.Such bulk materials differ considerablyin terms of grindability and abrasiveness.The capacities of cement produc -tion lines vary within wide limits tosuit individual requirements. Due toits design, the MVR roller mill isspecially suited for high and veryhigh throughput rates.The working principleUp to six stationary grinding rollers rollon a rotating grinding track. Drawn inbetween the rollers and track, the feedmaterial is ground by pressure andshear. The compression forces requiredfor comminution are produced by aroller arm and pivot bearing along witha hydropneumatic tension system.The ground material is conveyed bycentrifugal forces towards the stationarynozzle ring. Gases (air or hot gas)flowing up through the nozzle ringcarry the ground and dried materialto the classifier where it is separatedinto grits and fines by the rotor. Thegrits fall back into the center of thegrinding area.The finished product leaves the classifierwith the gas flow for separation inthe downstream cyclones or filter.The advantagesMultiDrive ®The MultiDrive ® system consists of upto six identical drive modules ensuringactive redundancy of the drive system.The MultiDrive ® design allows anoptimum speed of the mill and thushighest flexibility.Active redundancy of thegrinding roller systemUp to six grinding rollers, which canbe swung out separately with theirspecial suspension system, and thegrinding plate form a grinding gapthat remains parallel in any operatingpoint, ensuring a uniform compactionof the material to be ground. Thisconcept creates an active redundancyas in the MultiDrive ® system.Low capital costMVR mills require few ancillaries,no or little building volume, theiroperation is dust free and theyhave a low noise level.Low electric power consumptionThe grinding principle and highefficiencyclassifier reduce electricpower consumption by up to 40 % ascompared with conventional ball mills.Optimum utilization of process heatMVR roller mills allow an optimumutilization of the thermal energy ofprocess gases.Maximum availabilityThanks to low specific wear rates, highquality wear materials, and modernrepair methods, the maintenancedowntime of MVR roller mills isreduced to a minimum.Favorable control behaviorHigh drying capacity, short retentiontime, and remote control of grindingpressure and rotor speed allow a fullyautomatic operation of the MVR rollermill even with varying raw materialqualities.4 5