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Rotor weighfeeder FRW/SRW/VRW

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  • Product Brochure

    www.pfister.de

    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 dos-

    ing the system is easy to operate and thus extremely reliable.

    Pfister FRW + ProsCon: the innovative solution for metering powdered materials.

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    History

    FLSmidth Pfister has more than 110 years of

    experience in manufacturing industrial weigh-

    ing equipment and is part of the FLSmidth

    group since 1998.

    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 technol-

    ogy. More than 1,700 systems are in operation

    world-wide.

    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.

    How does the system work?

    What are the benefits?

    What are the dimensions?

    How ist the system installed?

    What are the technical facts?

    Is there further information?

    Pages 3-4

    Pages 5-7

    Page 8

    Pages 9-10

    Page 15

    Page 16

    All Pfister weighfeeders are

    Engineered

    Designed

    Assembled

    Tested

    in AugsburgGermany

    The usual applications kiln feed

    cement blending

    mill feeding (fine grained 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.

    The usual bulk materials raw meal

    cement

    fly-ash

    slag

    additives

    other fine or pulverised materials

    What applications are there? Pages 11-14

    Mill feeding and Kiln feeding. The application for rotor weighfeeder FRW.

    Historic Pfister scale. Ludwig Pfister,

    founder of the company in 1894.

    Contend

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    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 hous-

    ing (5) cover the rotor and provides a com-

    pletely closed and dust tight system. It is

    suspended on a eccentric weighing axis (A-

    A) through the middle of inlet and outlet.

    The third point is suspended with a tow-

    bar (6) at a load cell which weighs the gra-

    vimetric bulk material content inside the

    rotor. That means that the rotor weigh-

    feeder 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 infor-

    mation 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.

    The Weighing Electronics ProsCon

    The electrical controller calculates the required

    speed of the motor for the time of the dis-

    charge. It uses the set feedrate and the meas-

    ured 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 varia-

    tions of less then 0.5% for short- and long-

    term.

    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: air-supply for purge air, 9: weighing bearing, 10: suspension frame.

    1

    4

    5

    2

    3

    6 7

    A

    A 8

    How does the system work?

    9

    10

    To achieve high accurate feeding, angular speed of rotor is controlled invers to rotor weighfeeder loading.

    Function Principle

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    1

    MT

    M

    4 5process interface

    CPI

    Motor Control Center

    FC

    6 feeder

    controllerCSC

    CAN

    2 3 Power supply

    To plant control system

    Pfister Rotor Weighfeeder Controller

    All data are collected in the:

    Pfister CPICan Process Interface (at feeder (5))

    and transferred via CAN-Bus to the:

    Pfister CSCCan System Controller (in MCC (6))

    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)

    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, Follow-up Control.

    Reactive Control Compared to Pfis-

    ters 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 pre-

    feeding 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.

    Pfister Prospective Control ProsCon (Forward looking / pro-active)

    Function Principle

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    What are the benefits?

    Less Maintenance and Longer Opera-

    tion 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 ro-

    tor. 4 to 8 rounds per minute.

    Only one bearing which is additionally purge-

    air sealed. No rollers or idlers.

    All measuring parts and the motor are lo-

    cated 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 weigh-

    feeder since no spillage is possible.

    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 run-

    ning 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 sim-

    ple to operate. The communication to the

    local plant control system is flexible and

    works absolutely reliable.

    Optional remote process display RPD.

    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.

    Benefits

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    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 dos-

    ing 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

    r