Krauss-Maffei Peeler Centrifuge HZ Performance you can rely on
Krauss-Maffei Peeler Centrifuge HZ Krauss-Maffei Peeler Centrifuge HZ 180/7,1 Highest performance Whether they are applied in the chemicals, pharmaceutical or food industry Krauss-Maffei peeler centrifuges have always proved their worth. They are ensured by reliable operation and high performance. Peeler centrifuges are discontinuously operating filtration centrifuges. The rotor is of horizontal design with cantilever mounting. The centrifuges can be fitted with conventional filtration baskets or with baskets featuring a special rotary siphon. Modern controls and instrumentation enable result-oriented operation. Peeler centrifuges can be optimised to meet the varying processing requirements. Application fields Peeler centrifuges are used wherever solids of varying kinds are to be separated from a slurry by means of filtration. Examples Bulk chemicals Foodstuff: Bromides, chlorides, fluorides, Starch, sweeteners, etc. sulfur, etc. Spectrum of use Fine chemicals and Average particle size: pharmaceutical products 5-500 µm Amino acids, antibiotics, bleaches, citric acid, pesticides, Solids concentration of the pharmaceutical intermediate slurry to be separated products, salicylic acid, tensides, vitamins, etc. from 3.0 % wt Plastics ABS, antioxidants, melamine, resins, etc. Throughput of solids up to 15 t/h. 2
Your advantages Your advantages Low residual moisture based on high rotational speeds. High level of flexibility Peeler centrifuges can be excellently adapted to meet the process engineering requirements. By using variable speed drives, for example, and result-oriented control systems such as thermal feed controllers or ultrasonic feed controllers. Excellent washing results Exact metering of the wash liquid through the feed pipe or separate wash pipe. In peeler centrifuges with rotary siphon Besides the filtration basket KMPT also offers baskets with rotary siphon. These provide significant advantages during the operation of the centrifuge: Increased filtration capacity By creating a vacuum beneath the filter media In addition to the increased filtration pressure results in an improved filtration rate. High degree of product purity By controlling the flow rate the contact time between wash liquid and solids can be prolonged. Prolonged service life of residual heel: Regeneration of the residual heel by mean of backwashing. Increase in performance, avoidance of drop in performance Imbalance is avoided during the feed process - also during the feed of very fast filtering media through a partial increase in the filtration resistance. As a result of this the individual batch times are shorter and the overall performance is enhanced. Krauss-Maffei Peeler Centrifuge HZ 180/7,1 in starch production 3
Operation Filtration basket Siphon basket Feeding Washing Dry spinning Operation Advancement in control and instrumentation allows a flexible and result-oriented operation of the discontinuous filter centrifuges. For applications in the chemicals and pharmaceutical industry the individual cycle times for feed, filtering, washing and peeling vary from just a few minutes to several hours. The individual process steps are flexibly adapted to the prevailing conditions. Feeding During the feed process the slurry is fed into the centrifuge basket via the feed distributor. In most cases this process is interrupted several times to prevent suspension from flowing over the basket rim. The feed level is measured by a feed controller, either mechanically or contact-free using ultrasonic device, for example. Normally the basket is filled to approx. 75-85% of the height of the basket rim. The process is completed when the filter cake has reached the desired level. Filtration The main filtration commences with the feed procedure. It is completed when the slurry immerses in the filter cake. Washing Washing of the cake frequently takes place after the main filtration. For this purpose a wash liquid is fed into the basket via the feed pipe, or, with low washing conditions, the liquid is introduced through a wash pipe. The level of the wash liquid is controlled by the feed controller during the filling process. The washing filtration is completed when the wash liquid immerses into the filter cake. Dry spinning At the end of the wash process the centrifuge is accelerated to top speed. The spinning process continues until the desired residual moisture of the filter cake is attained. 4
Different basket designs Peeling The peeler knife is swung in to the filter cake which it then peels. The peeled filter cake falls into the solids shaft and is either discharged via a discharge chute or is removed by means of a screw conveyor. A thin layer of the filter cake remains in the basket to protect the filter media. This layer is called the residual heel and is used as additional filtering means. If the residual heel becomes displaced, it can either be regenerated by backwashing or it can be removed using pneumatic or hydraulic means. Different basket designs Krauss-Maffei peeler centrifuges are fitted with different basket types. The most common variants are the filtration basket and the special KMPT design of the siphon basket. Filtration basket: Once the filtrate has passed through the filter cake and the filter media it is discharged out into the filtrate housing. Siphon basket: The mode of operation of the centrifuge with rotary siphon is similar to that of a centrifuge with conventional filtration basket. However in this case, the filtrate is not spun into the filtrate housing after passing through the filter media. The filtrate is fed to the siphon chamber through channels in the basket rear wall. A siphon skimming pipe removes the filtrate from the siphon chamber. An additional filtering pressure is generated, caused by the difference in the level between filter media and the siphon chamber. This provides a more efficient filtration. Backwashing The siphon basket makes it possible to feed backwash liquid into the siphon chamber and thus permeate the residual heel from below. This process restores the required permeability of the residual heel. The liquid conducted into the basket through the backwash process is also used to help distribute the new slurry feed. The resulting uniform distribution of the charged solids reduces feed imbalance significantly. Filtration basket Pneumatic Siphon basket Hydraulic Peeling Backwashing Residual heel removal 5
Residual heel removal Installations Residual heel removal The residual heel left in the centrifuge becomes increasingly compressed as the number of batches progresses. This is due to the portion of fine particles resulting from particle degradation during the peeling process. If siphon baskets are not used or the residual heel generation through backwashing is no longer effective, the residual heel has to be removed regularly. There are two procedures used to remove the residual heel according to mechanical principles: Pneumatic residual heel removal The residual heel in the basket is blown off by compressed air or nitrogen applied through a pivot-mounted nozzle assembly. Hydraulic residual heel removal A large quantity of rinsing liquid is fed into the centrifuge via the feed pipe within a short period of time. The shearing load of the rinsing liquid causes the residual heel to disperse. In the two processes the residual heel is gently removed from the filter media with low wear and at low rotational speed of the centrifuge and then removed from the process area by the peeler knife. The disadvantage of reslurrying during the hydraulic cleaning of the residual heel is offset by the significant cleaning of the centrifuge after this step. It has to be decided which form of residual heel removal is most suitable and this depends on the respective application. Solids peeling devices The peeling device is used to peel the solids present in the centrifuge in the form of a filter cake and to deliver them to the solids discharge. Krauss-Maffei peeler centrifuges are fitted with broad peeler knives. These do not require any additional axial movement to the pivot motion. The advantage of this being that axial sealing is not required. Broad peelers ensure a uniform discharge of the solids in one direction only and with low dispersion. The peeling device and the product discharge form one unit. The drive is by hydraulic means and the feed rate can be regulated. 6
Solids discharge The peeler knife can be replaced as a wearing part and is designed in several parts to facilitate maintenance. Solids discharge There are two systems available for the removal of the peeled solids: Discharge chutes The peeled product drops through the discharge shaft into the chute. The product slides out over the transverse sliding surfaces. Conveyor screw The peeled product is delivered to the outside by means of a screw conveyor. Advantages of conveyor screws are: Higher throughput as a result of using wide baskets Arrangement/Foundation The centrifugal forces produced by the rotation of the basket are used to separate the solids from the liquid. If the product is not uniformly distributed in the centrifuge basket imbalance may develop. To keep the dynamic load exerted on a building to a minimum vibration-insulated installation is used out. This is implemented by installing the centrifuge on a concrete or steel block which is mounted on spring-damper elements. Important guidelines for installation are: The feed pressure should be approx. 0.5 bar Keep all supply pipes as short as possible Install all supply and discharge pipes with a maximum gradient Wide spectrum of use because products with greater adhesion tendency and higher adhesion factor can also be discharged. Installation on concrete block 7
Result-oriented control Thermal feed control sensor ultrasonic feed controller Provide sight glass in the pipes Ensure fast emptying of all pipes, e.g. through venting or compensation pipes in closed systems Solids discharge to be of vertical downwards arrangement without cross-section restriction All pipes to be of a flexible design Result-oriented control The following parameters are detected continuously to allow optimum peeler centrifuge operation at maximum output and with uniform product properties: Level in the basket Filtration rate Liquid immersing point in filter cake The detected measurements are evaluated by the control electronics and the process parameters, such as feed time, dry spinning time, wash time etc. are optimally adapted. The control is implemented as a result-oriented basis. There are two main measuring processes which have proved their worth in the technical application: Thermal feed controller (TFKR) The measuring sensor of the TFKR which is retracted and extended at regular intervals touchs the surface of the slurry, the wash liquid or the solid analyses for a short time. The electronics evaluates the signals and analyses. Advantages of the TFKR are: Determination of filtrate immersing point: based on the varying frictional heat the TFKR can differentiate between the surface of a liquid and a solid surface. More precise measurement: in comparison with the mechanical feed controllers the immersing frequency and duration can be freely selected. 8
Engineered Systems Ultrasonic feed controller (UFKR) The ultrasonic measurement is a contact-free measuring system. An ultrasonic sensor emits a measuring signal in the direction of the product in the basket. The ultrasonic signal reflected by the product is picked up by a sensor and evaluated by the control electronics. In multiple purpose production plants and with changing solvents it is necessary to carry out a reference measurement based on the different sound velocity. The patented system of KMPT offers the following advantages: Engineered Systems For optimal operating results with peeler centrifuges these machines must be adaptable to the upstream and downstream plant equipment. Individual designs also involve high engineering expenditure. KMPT has developed basic modules for the major, equipment-specific basic functions. This enables the provision of optimal functions at a low cost. The scope of our offer is tailored to meet your specific requirements. No mechanical contact with the product, no splashing and dust development No wear of the sensor and consequently no contamination of the product with abrasive metal particles No dynamic seals Smaller equipment installations in the machine Stepless level detection Krauss-Maffei System with peeler centrifuge 9
Dimensions and weights Size Basket inside diameter Basket length Capacity Filter Area 1 C-value ) Maximum 1 Speed ) HZ 25/0,1 250 125 2,5 0,10 2200 HZ 40/0,2 400 200 9,8 0,25 2000 HZ 63/0,3 630 160 20,6 0,32 1700 HZ 63/0,6 630 315 40,5 0,62 2020 HZ 80/1,0 800 HZ 80/1,3 800 500 103,7 1,26 1600 HZ 100/1,6 1000 500 164,0 1,57 1290 HZ 100/2,0 1000 400 630 83,0 206,6 HZ 125/2,5 1250 630 323,6 2,46 1030 HZ 125/3,2 1250 800 410,9 3,14 1030 HZ 160/4,0 1600 800 683,6 4,02 805 HZ 160/5,0 1600 1000 854,6 5,03 805 HZ 180/7,1 1800 1250 1350,0 7,07 710 [l] [m [xkg] [rpm] 4000 3000 2200 2400 1,01 1600 1900 1900 1520 1,98 1290 1520 1220 1220 950 950 840 Size l b h L B H Weight Without motor [kg] Weight with vibration block and drive [kg] HZ 25/0,1 670 500 550 1000 1100 HZ 40/0,2 810 720 750 1500 1300 HZ 63/0,3 1700 1100 1100 3600 3000 HZ 63/0,6 1800 1100 1100 3700 3000 HZ 80/1,0 2100 HZ 80/1,3 2400 1400 1300 4700 3500 HZ 100/1,6 2600 1650 1600 5200 3800 HZ 100/2,0 2800 1400 1650 1300 1600 HZ 125/2,5 3000 1900 1800 5900 4700 HZ 125/3,2 3400 1900 1850 6300 4700 HZ 160/4,0 3500 2300 2200 6700 5600 HZ 160/5,0 4000 2300 2300 7200 5600 HZ 180/7,1 4600 3000 3000 8600 6600 1400 1800 1800 1800 4300 3500 2500 2500 3000 5400 3800 3000 3500 3500 4400 4500 5300 75 500 1250 1350 3000 3500 5500 7000 10000 13000 23500 160 1350 2800 3500 2600 6000 7300 12000 4100 12500 15000 19000 31000 36000 55700 1 ) Density of saturated filter cake 1250 kg/m³, at T = 50 C, Material 316 L When using special materials it is possible to exceed the maximum speeds or C-values. All data are non-binding 10
H Dimensions l B b h L 11
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