Rotor Weighfeeder Pfister FRW / SRW

Transcription

1 Product Brochure Product Brochure Rotor Weighfeeder Pfister FRW / SRW Highly accurate and reliable gravimetric feeding of pulverised fuel Whether kiln feeding, additive feeding to the raw or finish mill or cement pre-loading, the robust design of the Pfister FRW is ideal for dosing powdered bulk materials such as raw meal, fly ash, bypass dust or cement products with high dosing constancy and precision. Due to the integration of weighing and dosing the system is easy to operate and thus extremely reliable. Pfister FRW + ProsCon : the innovative solution for metering powdered materials.

2 Contend How does the system work? What are the benefits? What are the dimensions? How ist the system installed? Pages 3-4 Pages 5-7 Page 8 Pages 9-10 What applications are there? Pages What are the technical facts? Page 15 Is there further information? Page 16 History FLSmidth Pfister has more than 110 years of experience in manufacturing industrial weighing equipment and is part of the FLSmidth group since The Rotor Weighfeeder technology was invented by FLSmidth Pfister in 1984 to feed pulverised coal to the cement burning process and it is now time tested and state of the art technology. More than 1,700 systems are in operation world-wide. Historic Pfister scale. Ludwig Pfister, founder of the company in Out of the long experience, FLSmidth Pfister developed the Pfister FRW for non-explosive pulverised material. Since the first installation in 1997, more then 200 systems have been installed world-wide for different applications and materials. General Principle The Pfister FRW is used for extracting fine grained bulk material out of a storage silo and feed it with high accurate feedrate on an airslide or any other transport media. All Pfister weighfeeders are Engineered Designed Assembled Tested in Augsburg Germany The usual applications kiln feed cement blending mill feeding (fine grained materials) The usual bulk materials raw meal cement fly-ash slag additives other fine or pulverised materials Mill feeding and Kiln feeding. The application for rotor weighfeeder FRW. 2/17

3 Function Principle How does the system work? The Function Principle The pulverised material is transported in the chambers of the rotor wheel (1) inside the feeder from the inlet (2) towards the outlet (3). At the outlet, the chambers are completely emptied. The rotor is driven by a variable speed drive (4). The rotor housing (5) cover the rotor and provides a completely closed and dust tight system. It is A A suspended on a eccentric weighing axis (A- A) through the middle of inlet and outlet. The third point is suspended with a towbar (6) at a load cell which weighs the gravimetric bulk material content inside the rotor. That means that the rotor weighfeeder measures real kilograms and is therefore a true scale. At the outlet, the material falls out of the feeder by gravity. The gravimetric measuring value provides information on the bulk material mass in the rotor weighfeeder before the material leaves the feeder. The loading of the rotor in relation to the angular section is stored by the weighing electronics. The speed of the rotor is controlled inverse to the loading of the rotor at the outlet Pfister FRW. A-A eccentric weighing axis. 1: rotor wheel, 2: bulk material inlet, 3: outlet, 4: variable speed drive, 5: rotor housing, 6: tow-bar to load cell, 7: Pfister CPI control box, 8: airsupply for purge air, 9: weighing bearing, 10: suspension frame. 5 The Weighing Electronics ProsCon The electrical controller calculates the required speed of the motor for the time of the discharge. It uses the set feedrate and the measured bulk material mass for the calculation of the angular speed of the rotor (see chart). Less material in the rotor results in a higher angular speed, more material in a lower speed. With this principle, so-called prospective control ProsCon, the rotor weighfeeder achieves a highly accurate compensation of variation in rotor loading and material density. This results in an extremely accurate feedrate with variations of less then ±0.5% for short- and longterm. To achieve high accurate feeding, angular speed of rotor is controlled invers to rotor weighfeeder loading. 3/17

4 Function Principle Pfister Rotor Weighfeeder Controller All data are collected in the: 1 Pfister CPI Can Process Interface (at feeder (5)) and transferred via CAN-Bus to the: Pfister CSC Can System Controller (in MCC (6)) M 2 3 Power supply The communication between the Pfister CSC and the plant control system can either be via: Serial-Interface (ModBus RTU). T M 4 5 process interface CPI CAN 6 feeder controller CSC To plant control system Network-Interface. FC (Profi-Bus DP, Device Net) Motor Control Center Analog/Digital-Hardwired Interface. Electronic control 1: pre-bin, 2: shut-off gate, 3: flow-control gate or star-feeder, 4: rotor weighfeeder FRW, 5: Pfister CPI, 6: Pfister CSC Reactive Control Compared to Pfister s Proactive Control Strategy Other feeders are based on a reactive control (follow-up) rather then a proactive control. Deviations in feedrate is measured and the prefeeding is adjusted. The measured deviation is already sent to the process. This also requires a very fine and sensitive pre-feeding device. With the proactive Pfister rotor weighfeeder, the material mass is measured before it leaves the rotor weighfeeder. That means that the speed of the rotor is adjusted before the material gets discharged into the system, not the other way round. Reactive, Follow-up Control. Pfister Prospective Control ProsCon (Forward looking / pro-active) 4/17

5 Benefits What are the benefits? Benefits in Installation Because of... Compact design with minimal installation height. It is not necessary to have a highly accurate and constant pre-feeding. Less necessary height of the pre-bin. The special installation shown on the right is running since 7 years without any problems. It is designed for a feedrate of 160 t/h with a total height of only 5.1 meters. Pleas see standard under chapter Installation. It is no additional dedusting necessary. Simple and intuitive operation. The rotor weighfeeder is an advanced mechatronic system. However it is very simple to operate. The communication to the local plant control system is flexible and works absolutely reliable. Special pre-bin and Pfister FRW. Feedrate 160 t/h, total height 5.1m. 1: pre-bin filling, 2: pre-bin, 3: pre-bin content measuring, 4: material extraction devices, 5: rotor weighfeeder, 6: aeration bottom. Less Maintenance and Longer Operation Hours Because of... Smart design with only one moving part, the rotor wheel inside. Completely dust tight. Less wear because of slow speed of the rotor. 4 to 8 rounds per minute. Only one bearing which is additionally purgeair sealed. No rollers or idlers. Optional remote process display RPD. All measuring parts and the motor are located on the outside of the system. Because of the minimal amount of parts, the system is extremely reliable and problem free. Less parts reduce maintenance work. Only steel in contact with bulk material. It is not necessary to clean the rotor weighfeeder since no spillage is possible. 5/17

6 Benefits High Accuracy in Dosing Because of No influence of pre-bin extraction property on the dosing quality. Air-flow or the flow characteristics of the bulk material have no influence on the dosing quality. Proactive rather then reactive dosing and feeding. The feedrate gets adjusted before material leaves the feeder, not the other way round. High measuring load. The design enables a high material layer and therefore a high measuring load in the weighing section. The material mass in the rotor weighfeeder is around ten times higher then with a traditional belt weighfeeder. Easy online calibration. If the pre-bin is placed on load-cells, it is easily possible to perform online-calibration. That means comparing the static weighing of the pre-bin with the continuous gravimetric weighing of the rotor weighfeeder. This redundant principle give highest accuracy and optimal calculation of total throughput. No shooting or relative movement of the bulk material possible. Immediately Adjustable Feedrate Because of its design, the rotor weighfeeder supplies its high dosing-accuracy in a range from 10% to 100% of maximum feedrate. The ProsCon control strategy ensure virtually no reaction time in changes of the feedrate. This is especially necessary for cement blending or mill-feeding if mixing-ratio or the overall load needs to be changed immediately. Higher Accuracy for Kiln Feed Results in... High accuracy of feeding prevents overfeeding and cyclone block-ups. Because of the short pass-through time of the raw-meal through the pre-heater, it is necessary to have a high sort-term accuracy. The more accurate and stable the feeding into a continuous process, the closer the whole process can be operated to its best performance. Possibly visible improvement of output, pressure and emission characteristics of the whole cement burning process. Smoother operation of the whole process. Higher Accuracy in Dosing for Cement Blending Results in... More accurate cement/filler mixture. The mixing ration is more accurate and therefore closer to the allowed limits. Highest possible amount of filler in the cement, for example fly-ash or limestone, with steady quality. 6/17

7 Service and Support Modern Maintenance Management FLSmidth Pfister s experience in maintenance management has been helping cement plants to make the cement production process more efficient for many years. The Benefits of MMM: Cost saving pre-planning of kiln outages. Regular check-up support; less overall downtimes. Support in spare parts management. Replacement of crucial parts at the right time. All maintenance measures carried out by experienced Pfister specialists. Reduce overall service cost. Maintenance contracts are available. Modern Maintenance Management reduces wear FLSmidth Pfister Augsburg WWW Modem on site Technical Assistance by Telesupport With an optional modem, experienced FLSmidth Pfister technicians have remote access to controller parameters, control logic and sensoric interface. This makes online help possible for trouble shooting and interpreting events and system messages. Pfister CSC in MCC Pfister CPI at feeder Online trouble shooting with optional modem 7/17

8 Dimensions What are the dimensions? Rotor Weighfeeder Pfister FRW / SRW Series Type Rotor Ø Height Feedrate * Feedrate * Weight (min.) (raw meal, max.) (cement, max.) (approx.) Pfister FRW mm 1470 mm 40 t/h 60 t/h kg Pfister FRW mm 1700 mm 120 t/h 180 t/h kg Pfister FRW mm 1700 mm 300 t/h 350 t/h kg Pfister FRW mm 2000 mm 450 t/h 480 t/h kg Pfister FRW mm 2200 mm 600 t/h 700 t/h kg *feedrate depending on bulk material density. Rotor Weighfeeder Dimensions Here: Type Pfister FRW 4.18, Feedrate max. 350 t/h Side view, Pfister FRW Top view, Pfister FRW /17

9 Installation How ist the system installed? 2 1 Typical installation of Pfister FRW. Pfister supplies: 1: pre-bin engineering, 2: pre-bin content measurement units, 3: pre-bin bottom aeration, 4: pre-bin bulk material extraction devices, 5: bulk material dosing with Pfister FRW flow-control gate star-feeder Installation of Pfister FRW with material extraction devices star-feeder or flow-control gate. - Star-feeders for feedrates between 0 t/h and maximum t/h. - Flow-control gates start from feedrates of minimum 3 t/h. 9/17

10 Installation Cement Blending Pre-ground clinker Fly ash Limestone meal Installation of three Pfister SRWs for online cement blending. In this special case it is not necessary to use a pre-feeding device because of small feedrates. Pfister SRW in the cement blending installation. In this case without pre-feeding device, the feeder is directly extracting out of the bulk material silo.. 10/17

11 Applications Application for Kiln-Feed at a Cement Plant in Romania Pfister FRW with pre-feeding devices. 1: Pre-bin, 2: shut-off gate, 3: flow-control gate, 4: discharge spout, 5: rotor weighfeeder, 6: aeration pipes 1 st Installtion in 1996 for Kiln-Feed at a Cement Plant in Germany Pfister FRW for kiln feed. 1: concrete pre-bin, 2: extraction box, 3: extraction devices, 4: rotor weighfeeder, 5: aeration pipes. 11/17

12 Applications Replacement of a 25 Years Old Pfister Belt Weighfeeder for Kiln-Feed at a Cement Plant in Lybia New Installation: Pfister FRW with for 120 t/h. Old Installation: Pfister Belt weighfeeder. Application for Cement-Blending at a Cement Plant in Germany 12/17

13 Applications Replacement of an old feeding system in Spain New Installation: Pfister FRW Feedrate 250 t/h. Application for Feeding Mill Residues back into the Cement Mill in Austria 13/17

14 Applications Application for Slag Dosing Pfister FRW for slag dosing. 1: diverter box, 2: shut-off gate, 3: flow-control gate, 4: discharge spout, 5: rotor weighfeeder. 14/17

15 Applications What are the technical facts? Pfister FRW / SRW Application: Highly accurate, gravimetric feeding of all kind of pulverised bulk materials. Design: The rotor weighfeeder is engineered, designed, assembled and tested in Germany. Certification: DIN EN ISO 9001:2000 Feedrate: 1.0 t/h to 700 t/h Feedrange: 10% to 100% Accuracy: ± 0.5% Electronic Controller: Pfister CSC controller with proactive control strategy ProsCon Electronics Temperature Range: Standard: 0 C to +40 C With heater * : -20 C to +40 C With cooler * : 0 C to +55 C *installed in local electric cabinet Interface to Plant Control System: Serial-Interface (ModBus-RTU). Network-Interface. (Profi-Bus DP, DeviceNet) Analog/Digital-Hardwired Interface. over the complete feedrange 15/17

16 Applications To see to the contend of your interest please click on the links below on our website: Press articles Special-interest articles Brochures Brochures.htm Product datasheets Datasheets.htm Product animations Pfister DRW Pulverized fuels Pfister FRW Powdered products Pfister TRW-K Crushed raw coal Pfister TRW Coarse products Pfister VRW Powdered products Pfister TRW-S Alternative fuels 16/17

17 Contacts Contacts FLSmidth Pfister GmbH Staetzlinger Str Augsburg Germany T F Sales Department: sales@pfister.de Technology Department: engineering@pfister.de Service Department: service@pfister.de Branches offices & joint ventures FLSmidth Pfister Inc Avenue C, Suite 201 Bethlehem, PA U.S.A. T F pfistera@ptd.net FLSmidth Pfister Ltda. Rua Vigário J.J. Rodrigues, c.j Jundiai S.P., Brazil T F pfister@pfister-la.com.br FLSmidth Pfister GmbH Malaysian Branch C-3A15, Centre Wing Metropolitan Office Suite Metropolitan Square, Jalan PJU 8/1 Damansara Perdana Petaling Jaya Selangor Malaysia T F pfismal@streamyx.com FLSmidth Pfister GmbH 6, Rue de Bretagne St. Quentin Fallavier France T F pnl@pfister.fr Transweigh India Ltd. 124, ABCD, Govt. Industrial Estate Kandivli (W) Mumbai India T F sales@transweigh-india.com FLSmidth Pfister GmbH China Western Part of Songshan Road Qingdao Airport Industrial Zone Chenyang District 2661g09 Qingdao P. R. China T F pfister-china@pfister.de 17/17