Thanks to its enclosed and compact design, the rotor weigh feeder provides high accuracy of measurement.
FLSmidth Pfister has developed the VRW rotor weigh feeder exclusively for bulk loading of clinker, cement, coke etc into trucks / wagons. The VRW rotor can be installed directly below the silo outlet openings. The rotor will deliver the required set quantity through the loading spouts to the open type wagons / enclosed tankers. There are major advantages of the Pfister VRW rotor for bulk loading compared to the conventional wagon loading using rail weigh bridge and dozing gates. In case of the Pfister VRW rotor, the feed rate can be precisely controlled from 65 TPH to 650 TP (according to the selection of the rotor scale model for the capacity), thereby reducing dusting and also the de-dusting can be optimised due to the consistent feeding.
Stable and accurate metering of pulverised or secondary fuels and of the feed to kilns and mills is one of the key requirements for producing clinker profitably and efficiently. The rotor weigh feeder uses a unique and future-oriented technology and of the state-of-the-art measuring principle employed and reviews the varied uses of this weighing system that not only provides high accuracy of measurement but is also unique, thanks to its enclosed and compact design. These product features place the Rotor Weigh feeder in the front rank of all the known weigh feeders currently on the market. The examples of installations given in this article start with the well-known DRW rotor weigh feeder for metering pulverised coal. It is combined with the equipment for pneumatic transport of the pulverised coal to the kiln burner or to the burner positions at the Calciner. This is followed by comments on the TRW Rotor Weigh feeder, which can also be supplied in a special ATEX design. It is used for gravimetric metering of alternative fuels, such as fluff, RDF, plastic waste, shredded car tyres and biomass, such as dried sewage sludge, wood pellets or animal meal. Because of their unusual properties and their often very low bulk densities these materials are generally difficult to handle. The series of rotor weigh feeders continues with the special models FRW for metering fine products, such as cement raw meal, fly ash, bypass dust and kiln dust, and the TRW weigh feeder that is offered for weighing coarse products, such as cement clinker, raw coal, gypsum and limestone. The product review ends with the VRW rotor scale that was developed specifically for measuring mass flows in the loading process and has proved very successful in this specialised application.
Advantage VRW R rotor scale
- Automatic feeding as per set point and no human intervention required for bulk filling.
- Accurate feeding at the rate of +/- 0.5 per cent and hence maximum utilisation of bulker.
- Weigh bridge installation inside the cement silo is not required.
- Options available for various materials like cement clinker, coal, fly ash, iron-ore fines and raw meal etc.
- Time taken to fill cement in a truck can be comparatively reduced thereby improving the overall dispatch per day.
- Saving in the filling time increases the dispatches.
- No material spillover and no extra filling time required.