Rotor Weighfeeder Pfister TRW

Transcription

1 Product Brochure Rotor Weighfeeder Pfister TRW Highly accurate and reliable gravimetric feeding of coarse, abrasive and hot materials Whether dosing materials to the coal mill, raw mill or finish mill. The robust design of FLSmidth Pfister s rotor weighfeeder Pfister TRW is ideal for metering coarse bulk materials such as coarse coal, clinker, pre-ground cement, limestone, gypsum, coal etc. with high constancy and precision. Due to the integration of material extraction, weighing and dosing the system is easy to operate and thus extremely reliable. Pfister TRW + ProsCon : the innovative solution for metering coarse materials.

2 Content How does the system work? What are the benefits? What are the dimensions? Pages 3-4 Pages 5-7 Pages 8-9 What applications are there? Pages What are the technical facts? Is there further information? Page 15 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 that long experience, FLSmidth Pfister developed in 1996 the Pfister TRW to feed coarse materials. More then 150 units are successfully in operation world-wide. Further derivates are the Pfister TRW-S for solid secondary fuels and the Pfister TRW-K to feed crushed coal to mills in power plants. Please see extra brochures for these Pfister TRW models. General Principle The Pfister TRW is used for extracting coarse bulk material out of a storage silo and feed it with high accuracy to the grinding mill. Because of its robust and all-metal design, it is especially beneficial if used for dosing of hot and abrasive materials such as clinker. Pfister weighfeeders are Engineered Designed Assembled Tested in Augsburg Germany Mill feeding The application for Pfister TRW 2/17

3 Function Principle How does the system work? A 7 5 A 3 1 Pfister TRW A-A eccentric weighing axis. 1: rotor wheel, 2: bulk material inlet, 3: outlet, 4: variable speed drive, 5: rotor housing, 6: load cell, 7: weighing bearing, 8: suspension frame. The Function Principle The Pfister TRW utilises the operation principle of a gravimetric drag chain conveyor which transports the material in a circle and has revolving trough walls. The bulk material is directly extracted from the storage silo and transported from the inlet (2) towards the outlet (3) by the rotor wheel (1). The rotor is driven by a variable speed drive (4). The rotor housing (5) covers the rotor and provides a completely closed and dust tight system. It is suspended on an eccentric weighing axis (A-A), which is through the middle of inlet and outlet. The third point is suspended with a tow-bar at a load cell (6) which weighs the gravimetric bulk material content of the rotor. The high material layer results in a high measuring load, which means that any effects of external disturbance variables can be virtually ignored. At the outlet, the bulk material simply 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 with bulk material is then stored in the weighing electronics together with the associated angular position. The speed of the rotor is controlled inverse to the loading of the rotor at the outlet section. 3/17

4 Function Principle The Weighing Electronics ProsCon The electrical controller calculates the required speed of the motor for the time of the material discharge. It uses the set feedrate and the measured bulk material mass for calculating the angular speed of the rotor (see chart). That means that the speed of the rotor is controlled inverse to the loading of the rotor at the outlet. 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 highly accurate feeding, the angular speed of rotor is controlled invers to rotor weighfeeder loading. Pfister Rotor Weighfeeder Controller All data are collected in the: 1 Pfister CPI Can Process Interface, at the feeder (3) and transferred via CAN-Bus to the: Pfister CSC Can System Controller, in the MCC (4) The communication between the Pfister CSC and the plant control system can either be via: Serial-Interface (ModBus RTU). Network-Interface. (Profi-Bus DP, Device Net) M T 2 Can Process Interface CPI 3 (Local) CAN Electronic Control System of PfisterTRW. 1: bulk material silo, 2: Pfister TRW, 3: CPI, Can Process Interface, 4: Feeder controller CSC. Feeder Controller CSC AC 4 (Motor Control Center) Analog/Digital-Hardwired Interface. 4/17

5 Benefits What are the benefits? Pfister TRW Reduces Wear and Maintenance Compact design with minimal amount of functional parts. No cleaning necessary. Low wear because of slow speed of the rotor (max. 4 8 rounds per minute). Only wear resistant steel in contact with bulk material, no rubber belt. Suitability for a wide variety of bulk-materials Able to handle large lump sizes up to 100 mm because of the large inlet diameter and generous dimensions. Any foreign bodies can easily be removed through the service openings. Insensitive to hot and abrasive materials. (continuous: 200 C, peak: 250 C) Only one moving part, the rotor inside. no belt, no pulleys, no idlers. The only axis is additionally purge-air sealed. This results apparently in: Less maintenance work Easy and simple maintenance Higher reliability Higher efficiency Designed for long service life. Feeding Accuracy High accuracy because of intelligent controller with proactive control strategy ProsCon. High measuring loads, which are 10 times higher compared to belt weighfeeders. This eliminates external influences. Insensitive to pressure differences in the process. This high accuracy results in exact mixing ratios into the mill. 5/17

6 Benefits Smart Design Completely closed and dust tight, an environmental friendly system. 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. Integration of material extraction, measuring section, dosing and bulk material transfer in one piece of equipment. Excellent Service & Support Whether putting new systems in operation or requiring maintenance for Pfister equipment which is already in operation Pfister service technicians are trained and experienced in handling all Pfister equipment. Thus Pfister may ensure that the production processes will work smoothly from the beginning and further on. FLSmidth Pfister supports with the following services: Saves additional Equipment No spillage conveyor necessary. No dedusting or aspiration necessary. Possibility to suspend the Pfister TRW at the silo outlet. This makes additional foundations or support structures obsolete. Rotor weighfeeders are 100% assembled and tested in the Pfister work-shop before delivery. World-wide FLSmidth Pfister representation through several subsidiaries and agencies. Training for operators and maintenance personal at FLSmidth Pfister in Augsburg or on customers site. 24 hours technical telephone hotline. Short notice support with service specialists. Fast support with emergency spare parts. Optional operation process display, RPD. Modern maintenance management. Technical assistance by Telesupport. 6/17

7 Service and Support Modern Maintenance Management 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. PfisterCSC in MCC Pfister CPI at feeder Online trouble shooting with optional modem. 7/17

8 Dimensions What are the dimensions? Rotor Weighfeeder Pfister TRW Series Type Rotor Ø Height (min.) Feedrate (max.) Weight Pfister TRW mm 1320 mm 30 t/h clinker 1,550 kg suspended 60 t/h pre-ground clinker 1,900 kg in frame Pfister TRW mm 1700 mm 120 t/h clinker 2,900 kg suspended 250 t/h pre-ground clinker 3,400 kg in frame Pfister TRW mm 1900 mm 200 t/h clinker n.a. suspended 400 t/h pre-ground clinker 5,500 kg in frame Dimensions, Rotor Weighfeeder Suspended at Silo Outlet Here: Type Pfister TRW 4.14, Feedrate max. 250 t/h Side view, Pfister TRW 4.14 for suspension at silo outlet. Top view, Pfister TRW 4.14 for suspension at silo outlet. 8/17

9 Dimensions Dimensions, Rotor Weighfeeder Mounted in a Frame Here: Type Pfister TRW 4.14, Feedrate max. 250 t/h Side view. Pfister TRW 4.14 in a frame. Top view. Pfister TRW 4.14 in a frame. 9/17

10 Pfister Workshop Pfister TRW in the Pfister workshop after extensive test and quality control Pfister TRW without top sealing plate. The rotor walls move with the scraper bars. 1: rotor walls, 2: material outlet 3: scraper bars, 4: housing ring, 5: lower sealing plate. Top view into the material inlet with wear resistant lining. Workshop test: Pfister TRW in a test with different abrasive materials. 10/17

11 Applications What applications are there? Three Pfister TRWs feeding a cement-mill in Germany Pfister TRW feeding raw material into the cement mill at a German grinding plant. The complete closed and dust tight design reduces dust emissions of the plant. Pfister TRW feeding pre-ground cement clinker into a roller mill circuit in german cement plant. Even highly abrasive materials such as pre-ground cement clinker can be used with the Pfister TRW. View through the service opening into the feeder. 11/17

12 Applications Modernisation of white clinker feeding to cement mill in France 1 New Installation: Rotor weighfeeder for hot white cement clinker, directly flanged to the silo outlet. It is possible to feed material with a peak temperature of 250 C because only steel parts are in contact with the bulk material. Fading of the paint at the frame proofes extreme temperatures (1). Old Installation: traditional belt weighfeeder with rubber belt. The customer had to replace the belt regularly. The new Pfister TRW drastically reduced wear and maintenance. Pfister TRW feeding iron oxide to a cement mill in Germany Installation for iron oxide feeding. The rotor weighfeeder is suspended at the pre-bin which is placed on load cells. This makes online-calibration possible. 12/17

13 Applications Pfister TRW feeding pre-ground white cement clinker in France Pfister TRW for pre-ground white cement clinker directly flanged to the silo outlet. View through the service opening in the top sealing plate of the feeder. View through a service opening in the top sealing plate toward the material outlet. 13/17

14 Applications Pfister TRW feeding coarse coal to a coal mill in an Indian power plant. Old Installation: traditional volumetric drag chain feeder. New Installation: Pfister TRW at an Indian power plant. Pfister TRW feeding green coke at a German Refinery. Bulk Material: wet & sticky petroleum coke. New Installation: Pfister TRW replaced a belt weighfeeder for petroleum coke feeding. View into the rotor weighfeeder at the material outlet. 14/17

15 Technical Facts What are the technical facts? Pfister TRW Application: Mill feeding, especially for hot and abrasive bulk material. Bulk Material: All kind of coarse material. Dimensions, depending on model: Height: 1320 mm to 1900 mm Weight: 1,550 kg to 5,500 kg Design: The machine is engineered, designed, assembled and tested in Germany. All bulk material touching parts are made of wear resistant steel. Certification: DIN EN ISO 9001:2000 Feedrate: 2.0 t/h to 400 t/h Feedrange: 10% to 100% Accuracy: ± 0.5% over the complete feedrange related to the actual value. 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 the electrical cabinet at the feeder Interface to Plant Control System: Serial-Interface (ModBus-RTU). Network-Interface. (Profi-Bus DP, DeviceNet) Analog/Digital-Hardwired Interface. 15/17

16 Further Information 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 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 Chengyang District Qingdao P. R. China T F pfister-china@pfister.de 17/17