se andritz kmpt peeler centrifuge hz engl

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Peeler centrifuge

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  • Krauss-Maffei HZ peeler centrifuge

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 1

  • 2 Krauss-Maffei HZ peeler centrifugeTable of contents

    Krauss-Maffei peeler centrifuge, HZ 3

    Process advantages 4

    Basket designs 5

    Operation 6

    Centrifuge controls 8

    Process automation 9

    Foundation/installation 10

    Dimensions and weights 11

    Technical data 11

    Test centers 12

    Services 13

    Company profile 14

    Product lines 15

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 2

  • 3Krauss-Maffei HZ peeler centrifugeMaximum efficiencyKrauss-Maffei horizontal peeler cen-

    trifuges are batch operated filtration

    centrifuges known for their reliable

    performance at high capacities. They

    are used in many processes, primarily

    in the bulk chemicals, fine chemicals,

    and food industries.

    The horizontal rotor assembly is cantilever-

    mounted and, depending on the applica-

    tion, can be provided with a conventional

    filtration basket or a specially designed ro-

    tary siphon basket. A fully opening housing

    door provides access to the basket and all

    process components for maintenance.

    Adding variable speed drives and custom-

    tailored controls and instrumentation en-

    ables the peeler centrifuge to be optimally

    adapted to a multitude of processing re-

    quirements for peak performance.

    Main applications Bulk chemicals

    (Petrochemical intermediates, ferti-lizers, chlorides, sulfates, calciumcompounds, sodium compounds)

    Fine chemicals(Aluminum fluoride, amino acids, bleaching agents, surfactants, herbi-cides,pesticides, catalysts, dyestuffs)

    Pharmaceuticals/related(APIs, vitamins, salicylic acid, citric acid, ascorbic acid, calcium citrate,antibiotics)

    Plastics/related(ABS, resins, melamine, PE, PP, anti-oxidant agents)

    Foodstuff/related(Native and modified starches, arti-ficial sweeteners, vanillin, caffeine)

    Processing parametersAverage particle size2-500 m

    Feed solids concentrationFrom 3.0% by wt.

    Solids throughputUp to 15 t/h

    Materials of construction

    for process wetted parts:

    Various grades of stainless steel

    Nickel-based alloys

    Special metals with or without lining

    Krauss-Maffei peeler centrifuge, HZ 125/3.2 Si

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 3

  • 4 Krauss-Maffei HZ peeler centrifugeProcess advantages

    Krauss-Maffei peeler centrifuges

    with rotary siphon

    By utilizing the rotary siphon feature, an orig-

    inal ANDRITZ KMPT development, the over-

    all performance of the peeler centrifuge can

    be improved considerably. Substantial ad-

    vantages include:

    Increased filtration capacity

    Creation of a vacuum beneath the filter cloth

    increases the filtration pressure and boosts

    the filtration rate.

    Superior product purity

    The filtration rate can be adjusted to prolong

    the contact time by wash liquid and solids

    to produce a purer cake.

    Extended residual heel service life

    Regeneration of the residual heel is

    achieved by means of backwashing through

    the filter medium.

    Smoother operation

    Through backwashing and throttling of the

    filtration rate, the siphon feature enables

    feeding into a liquid pool for uniform distri-

    bution of solids without vibration, even with

    fast filtering products.

    Your benefits Unequaled flexibilityKrauss-Maffei peeler centrifuges can beadapted easily to changing processrequirements. Different control recipescan be usedto select the optimumoperating speed and cycle sequencefor yielding the highest product qualityat peak capacity.

    Lower residual cake moisturedue to high centrifugal forces.

    Excellent wash resultsthrough even distribution of washliquid,achieved by horizontal basket configura-tionand feed via distributor orspraybars.

    Krauss-Maffei peeler centrifuge, HZ 180/7.1

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 4

  • 5Krauss-Maffei HZ peeler centrifugeBasket designsKrauss-Maffei peeler centrifuges are

    furnished with various basket designs.

    The versions most frequently applied are the

    conventional filtration basket and the rotary

    siphon basket, an original ANDRITZ KMPT

    development.

    Filtration basket

    Of fabricated/welded or cast design, the fil-

    tration basket has a cylindrical shell with fil-

    trate bores through which the filtrate is spun

    out into the filtrate housing after passing

    through the filter medium.

    Rotary siphon basket

    Contrary to the conventional perforated

    basket, the rotary siphon basket has a solid

    cylindrical shell with filtrate bores arranged

    radially at the rear end of the basket, where

    they are connected to a siphon-shaped

    chamber. Once it has penetrated the filter

    cake and the filter medium, the filtrate is

    redirected through axial channels beneath

    filter medium support segments into the

    siphon chamber where a pivoting skimmer

    pipe extracts it from the centrifuge under

    positive pressure. The radial distance be-

    tween the filter medium and the liquid level

    in the siphon chamber increases the driving

    force and thus the filtration rate.

    Filtration basket Rotary siphon basket

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 5

  • SuspensionSolids

    Filtrate

    6

    Krauss-Maffei HZ peeler centrifugeOperationFeeding

    The suspension is introduced into the rotat-

    ing centrifugebasket via the feed distributor.

    Typically, this would includeseveral intermit-

    tent feed pulses to prevent the suspen-

    sionfrom spilling over the basket rim. The fill

    level is monitored andregulated by a feed

    controller. Normally, the basket is filledwith

    solids up to 75-80% of the basket rim

    height. The feedstep is complete when the

    filter cake has reached the desiredlevel.

    Filtration

    Primary filtration of the mother liquor

    through the filter medium installed in the

    basket begins with the feed step and

    endswhen the liquor has submerged into

    the filter cake. The solids retainedon the fil-

    ter medium after completion of a cycle and

    discharge of product serve as a filter

    medium for subsequent cycles.

    Washing

    A cake wash step will often follow the pri-

    mary filtration step. Wash liquid is intro-

    duced through the feed distributor or,

    for lower wash rates, through a separate

    spray bar. The wash liquid level is again

    monitored by the feed controller and

    thewash step is concluded once the pre-

    determined amount of wash liquid has

    been used and the liquid submerges into

    thefilter cake.

    Dry spinning

    Immediately following the feed and wash

    step, which may becarried out at a lower

    speed, the basket is accelerated tomaxi-

    mum allowable speed for the cake dry spin-

    ning step which ends when the desired

    residual cake moisture is reached, or after a

    predetermined spin time.

    Peeling/cake discharge

    At the end of each centrifuge cycle, the filter

    cake is removedfrom the basket by a piv-

    oting peeling device equipped with abroad

    peeler knife. Depending on the product

    characteristics,the peeling motion is con-

    ducted at full or reduced basketspeed with

    adjustable swivel advance velocity. The

    scrapedlayers of product are diverted into

    a trough and dischargedfrom the centrifuge

    through an inclined chute or a horizontal

    screw conveyor. To protect the filter

    medium, a thin layer of filter cake is retained

    in the basket. This layer, called the residual

    heel, becomes the filter aid for subsequent

    cycles.

    Discharge chute

    The peeled solids are accumulated and

    channeled to theoutside of the centrifuge

    by an inclining chute mounted onthe hous-

    ing door below the peeling device.

    Screw conveyor

    The peeled product is diverted to a horizon-

    tal, door-mounted screw conveyor which

    conveys the solids to the outsideof the cen-

    trifuge.

    Advantages Higher centrifuge throughput dueto

    thepotential of utilizinglongerbaskets.

    Usable forapplications withsolidsexhibiting a tendency towards ad-hesionand with increasedinternalfrictionfactors, both affectinggravity flowinherent to chutedischargecon-figuration.

    Siphon basket feeding Siphon basket washing Siphon basket dry spinning

    HZ-EN-04_11.qxp_Layout 1 22.09.11 14:11 Page 6

  • SuspensionSolids

    Filtrate

    Siphon basket backwashing Discharge chute Screw conveyor

    Backwashing

    With the rotary siphon basket it is possible

    to feed backwashliquid from an overhead

    mounted prime tank through the siphon

    chamber to permeate the residual heel from

    underneath.This process re-suspends the

    residual heel and restoresits permeability. It

    also primes the rotary siphon for thenext fil-

    tration cycle. The liquid pool on top of the

    heel createdthrough backwashing will as-

    sist in evenly distributing the subsequent

    cycles incoming suspension, which will vir-

    tuallyeliminate the potential for imbalances

    during the feed step.

    Residual heel removal

    After frequent cycles, the residual heel may

    have compactedwith enough fine solids to

    make it impermeable, resulting inpoor filtra-

    tion performance. When this occurs, the

    heel maybe regenerated (by backwashing

    in siphon peeler centri

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