Separation Duties

Separation of • distillery yeast (yeast recycling) • yeast extract • monosodium glutamate • algae

Clarification of • beet sugar molasses • cane sugar molasses

Separation and washing of • baker's yeast • fodder yeast from molasses • fodder yeast from spent sulphite liquor • fodder yeast from wood hydrolysates • proteins from hydro5arbons

A Complete Range of Centrifugal Separators for the Fermentation Industry

Alfa-Laval has supplied centrifuga' separators to the fermentation industry since the turn of the century. Since then they have been steadily improved to meet growing demands for capacity, reliability and hygiene.

The continuous yeast harvesting separator with nozzles for yeast concentrate discharge is now available in four different designs to meet different process requirements.

Alfa-Laval's well-proven design of solids-ejecting separators are widely used for molasses clarification. Separated solids are periodically ejected by an automatically controlled hydraulic mechanism.

Several variables such as the amount and type of solids in feed, temperature, viscosity and required degree of clarification or concentration, influence the final selection of a separator. The following capacity figures and technical data are guicies to assist you in selecting the most suitable size and type of separator for your needs.

Contact your nearest Alfa-Laval representative for more information and qualified assistance in determining which machine is required to fulfil your separation needs.

Capacities — Yeast

Capacities — Molasses Baker's yeast Fodder yeast

wort wort up to m 3/h up to m 3/h

Distillery mash

up to m 3/h

;Beet sugar molasses 45° Brix

up to I/h

Carie sugar molasses 45° Brix

up to 1/h

DX 409B 40 25 35 BRPX 207S 2,000 1,400 SFDX 409S 35 20 30 BRPX 309S 5.000 3,500 FESX 510S 50 30 45 BRPX 213S 10,000 7,000 FESX 512S 70 40 60 BRPX 417S 20,000 14,000

FEUX 510T 50 30 45 SPSX 512S 25,000 FEUX 512T 75 45 65 SPQX 512S 25.000 FEUX 420T 150 100 130

General Technical Data

FESX & SPSX Models Basic type of nozzle centrifuge with a ring of tangential nozzles around the perimeter for continuous discharge of concentrate.

The effluent is discharged under pressure by a built-in paring disc pump.

DX & SFDX Models External discharge nozzles are stepped back to a reduced diameter. This arrangement reduces the amount of energy needed to spin the bowl. Effluent discharge may be open or pressurized.

FEUX Model This type has internal nozzles discharging into a central chamber where a stationary paring tube scoops out the concentrate and delivers it under pressure to a closed piping system. This system offers both engineering and hygienic advantages. The effluent is discharged under pressure. The largest size. FEUX 420, has internal nozzles with adjustable aperture.

Solids-Discharging PX Clarifiers This type of separator is the most efficient machine for clarification of process flows, e.g. molasses and distillery stop. It has a sliding bowl bottom which is momentarily dropped at intervals by an automatically controlled hydraulic system, exposing a ring of ports through which separated solids are ejected by centrifuga! force.

A similar type of machine with a separate outlet for water is used to purify deparaffinated gas oil in the SCP process.

SPQX Model This nozzle type separator features an extra inlet pipe for concentrate fitted inside the feed pipe'and projecting into a chamber at the center of the bowl. From this chamber tubes lead to a point close to the nozzles.

A certain amount of the concentrate leaving the machine is pumped back to the nozzles through this system. The concentrate is then discharged together with the newly separated solids. This recirculation method ensures that a concentrate of optimal concentration leaves the centrifuge system.

Motor Number of Paríng Low-speed Full-speed Paring CIP Net weight' Bowl kW nozzles disc cleaning cleaning tube slide kg r/min DX 409B-34 22 12 SFDX 409S-34 22 12 • FEUX 510T-35C 45 9 • FEUX 512T-31C 55, 75 12 • • FEUX 420T-31 C 90,135 18 • FESX 510T-35C 37, 45 9 • • FESX 512S-31C 45, 55 12 •

900 950

6240 5300

• • • 1400 6625 • 2500 5295

• • • 3800 3745 1400 6625 2500 4805

Motor kW

Solids space, I

BRPX 207 SGT-34T 5.5 4.4 BRPX 309SGV-34T 11 5.6 BRPX 213SGT-34T 18.5 16.4 BRPX 417SGV-34CGT 37 25.7

Paring disc

Bowl speed Net weight* r/mín kg

• 6150 800 • 5670 900 • 4440 1450 • 3625 2300

These BRPX centrifuges are specially designed to handle a high density feed containing abrasive partirles.

Motor Number of Paring Bowl speed Recirculation Net weight' kW nozzles disc r/min tubes kg

SPSX 512S-31CG

SPQX 512S-31 CG

45,55 12 •

37,45 12 • 4630

4630 12 2500

2500 - — -

The letters CG in the type designation indicate that the machines have rigid coupling and are protected against erosion.

Approximate weight for separator with motor.

Baker's yeast, distiller's yeast Baker's yeast, distiller's yeast (also from spent sulphite liquor), fodder yeast Ditto

Fodder yeast (from highly foaming wort) Baker's yeast, distiller's yeast (also from spent sulphite liquor), fodder yeast Ditto Ditto Ditto Ditto Brewer's yeast

DVK4M SFDX 209-308 or S

(SF)DX 309-30B SLDX 209-30B FESX 412B-30

FESX 412S-30 FEUX 412U-30 FEUX 412X-30 FEUX 412Y-3b FEUX 412T-30E

ALFA-LAVAL YEAST SEPARATORS for baker's yeast, fodder yeast,

distiller's yeast, and other microorganisms

Introduction: Some years ago the Alfa-Laval Company put a new series of yeast separators on the market and these separators are known as the DX series. The demand for bigger high-efficiency separators has, however, increased in the last few years, and to meet this demand the Alfa-Laval Company has developed new types of separators which have considerably high-er throughput capacities than the old series. The Alfa-Laval' Company has also put on the market a quite new and epoch-making type of equipment which makes it possible to obtain the yeast concen-trate in a closed pipe from a separator under pressure. This equipment also makes it possible to alter the yeast concentration when the machine is running. Table 1 gives a complete list of alI yeast separators now being manufactured by Alfa-Laval AB, Sweden.

The letters in the type designations indicate the follow-ing characterietics of the machines: First two letters

FE = Fermentation industry (used for later types on ty)

SF ...- Special design for distiller's and fodder yeast SL = Special design for highly foaming wort

Next two letters

DX = External nozzles placed at a reduced diameter SX = External nozzles placed in the periphery of the

bowl

UX = Interna! nozzles with paring tube for the yeast concentrate

The last letter A = Open covers with feed cup and strainer B = Semi-closed covers with feed pipe and open

outlets (spouts) for effluent and yeast concen-trate

S = Paring disk for the effluent T = Paring disks for the effluent, and (stationary)

fixed paring tube for the yeast concentrate U = Paring disk for the effluent and adjustable tube

for the yeast concentrate X = Semi-closed covers with feed pipe and open

outlet (spout) for the effluent, but with (stationa-ry) fixed paring tube for the yeast concentrate

Y = Semi-closed covers with feed pipe and open outlet (spout) for the effluent, but with adjust- able paring tube for the yeast concentrate

E = Gastight design

Table 1

Type of separator: Mainly used for:

1

All types of Alfa-Laval yeast separators are now paint-ed in the Centriblue colour. This is a very resistant epoxy lacquer. The colour gives an attractive appear-ance and blends well with the stainless steel parts of the machine. It is also very easy to keep clean. All the separator bowls are provided with 12 nozzles, no matter if they are placed at a reduced diameter or in the periphery of the bowl.

The machines with paring tubes (FEUX-types) are usually provided with 12 tubes leading the concentrate from the periphery of the bowl to a central chamber. In the FEUX 412T-30E, however, there are only 6 tubes for the concentrate. These tubes hold the ex-changeable nozzles otherwise placed in the bowl wall. The new Alfa-Laval series of yeast separators consists of the following types:

FESX 412B-30 FESX 412S-30 FEUX 412U-30 FEUX 412X-30 FEUX 412Y-30 FEUX 412T-30E

Al! these types of separators can be used for separa-tion of baker's yeast and fodder yeast: Type FEUX 412T-30, however, is a machine of special design, particularly intended for separation of brewer's yeast. The last letter of this denomination, E, stands for gas-tight execution as this machine can work under CO2 pressure.

Description of the DX machines Al! DX machines have the following characteristics in common. The receptacles for yeast concentrate 4nd clarified wort are made of stainless steel grade 18/111/ 2.7. They have been designed to receive yeast con-centrate and effluent without any leakage even at high speed, and to make all their parts easily accessible for cleaning, thereby making them suitable for use in modern food industries of high sanitary standard. All DX-type bowls have the nozzles at a reduced diameter. Among the advantages of the DX machines as com-pared to previous types we may mention thinner inter-mediate disks and caulks, which make it possible to increase the number of disks and, consequently, also the efficiency of the separator. The nozzles are screwed into the bowl body and tightened by a gasket. Earlier they were screwed in and soldered, and a fitter could not exchange them on the spot, as is now possi-ble. The nozzles proper are made of stainless steel, but sapphire inserts and other inserts of hard metal grades are available and should be employed when the yeast is contaminated by erosive solids, e.g., in distilleries ancrsulphite pulp milis.

The DX 209----30S and SFDX 209-30S machines are provided with paring disks. Even at high feed rates they are capable of producing discharge pressures up to 4 kg/cm 2 (57 psig). S-type machines are recommen-ded when a discharge pressure is required. These machines also have another advantage: if a back pres-sure of more than 3 kg/cm 2 (43 psig) is maintained on the paring disk the separated wort will emerge free of foam. Where waste sulphite liquor and other liquids tending to form a stable and "tough" foam are treated, a separator with a paring disk will save much trouble.

FESX 412B-30

This separator resembies the conventional type of yeast separators, and is, though of larger size and of higher capacity, comparable to the DX, 309-30B type machine. The design of the bowl, however, differs con-siderably from the DX types as the nozzles are placed in the periphery. of the separator bowl. This arrange-ment offers the possibility of handling also contamin-ated yeast which may cause troubles in other types of bowls. When separating fairly pure yeast it is also possible to clean the bowl .without dismantling by me-rely flushing out remaining yeast deposits with warm water.

The separator is further equipped with a "power recov-ery ring" through which the effluent leaves the bowl, resulting in a reduced power consumption. The set of covers is of the type known as the semi-closed B cov-er, which means that the liquid to be separated is fed to the separator through a feed pipe, the effluent and the yeast concentrate leaving the separator through open outlets.

When separating baker's yeast the separator has a throughput of up to 75 m3/h (16,500 igph). With yeast of the Torula type, which is often more difficult ro separate, the capacity is about 25-60 m 3/h (5506-13,000 igph.), depending on the type of raw material.

The machine is equipped with a standard frame and the bowl spindle is driven by a worm gear, which is signed for a maximum motor power of 50 hp. The frame is of a modern design with central lubrica-tion from an oil bath. The worm wheel and the friction blocks can easily be exchanged without removing the motor. The bowl spindle has very stable bearings and is of such a design that the worm is fixed to a holiow

Description of the new high-efficiency Alfa-Laval machines The new series of bigger and more efficient machines developed by Alfa-Laval have a throughput about twice as high as for the machines in the DX series. The machines in this new series have all parts which are in contact with the liquid made of stainless steel of the highest quality. Thus all the covers and also the upper part of the frame are made of stainless steel grade 18/11/2.7. Most of the parts in the bowl are also made of this material with the exception of the bowl body and the lock ring, which are made of stainless steel of higher mechanical strength than the material 18/11/2.7.

The design of the upper frame part of the new machi-nes differs from that of the smaller DX-types. This part is made of solid stainless steel and for the FESX ma-chine it also serves as a yeast receptacle. The high hygienic demands of the food industry were taken into consideration when the new machines were designed. To facilitate cleaning, all machines are pro-vided with a special flushing nozzle, making it possible to spray the inside of the cover and the inside of the upper part of the frame with water, thus removing remaining yeast which otherwise would stick to the surface of these parts. Arrangements are also made for "cleaning-in-place" of the FEUX-type bowls, i.e., the bowls can be cleaned without beigg taken apart.

Yeast concentrate

<z3 Feed

c> Effluent

Yeast concentrate

Effluent

4=1 Feed

f=> Effluent

Yeast concentrate

Effluent

1 Yeast concentrate

FESX 412 R

FEUX 412 U

Outlet yeast concentrate: under preseure Outlet wort concentrate: under preseure

FEUX 412 Y

Outlet, yeast concentrate: Outlet wort concentrate:

under preseure open

FESX 412 S

Outlet yeaat concentrate: open Outlet vort concentrate: under preseure

Outlet yeast concentrate: open Outlet wort concentrate: open

3 Y6609-02 FDG

shaft supported by two bearings. At the lower end of the spindle there is a coupling between the hollow shaft and the spindle. In this way vibrations from the spindle are prevented from being transmitted to the hollow worm shaft (quill drive).

For power requirements up to 35 hp a flange motor can be used, whereby the type denomination of the machine will be FESX 412B-34.

For power requirements up to the aboye max. effect of 50 hp a foot motor, mounted together with the sep-arator on a common baseplate, should be used. The type denomination will then be FESX 412B-35.

FESX 412S-30 This machine has a bowl similar to that of the aboye type FESX 412B-30 and is thus equipped with nozzles in the periphery of the bowl. It differs, however, in that it is equipped with a paring disk for the effluent. This machine corresponds to the paring-disk type machine SFDX 209-30S, but the capacity is more than doubled. The machine can be used for all types of yeast. It is, however, particularly suitable in distilleries and in sulphite paper cnills, as it can handle contaminated yeast and preVents foaming.

The capacity of the machine is the same as that of the FESX 412B-30, i.e., up to 75 m 3/h when separating baker's yeast and 25-60 m 3/h when separating fodder yeast of the Torula type.

This machine is normally delivered with a standard frame with worm gear, equipped with a 50 hp foot motor mounted on the same foundation plate as the separator. The denomination is then FESX 412S-35.

FEUX 412U-30 This machine is of a different design compared to other Alfa-Laval yeast separators. In the bowl the yeast con-centrate flows from the periphery through a number of tubes with internal nozzles into a chamber in the bowl centre. In this chamber there is a paring tube discharg-ing the yeast concentrate from the separator in a se-parate pipe under pressure. These are the characteris-tic features of the FEUX 412 separators. The position of the paring tube can be altered from outside during operation, and thus the flow of yeast concentrate can be varied. The advantage of this device is the possi-bility of fine control of yeast cream concentration and of moderate variations in feed rate and/or feed con-centration.

Further, the bowl is equipped with a paring disk for discharginp the effluent under pressure.

Due to the absence of nozzles in the bowl wall the bowl speed can be kept higher than for the FESX 412 separators and therefore the FEUX 412 type separa-tors are the most efficient ones. They are thus most suitable for heavy duties in the production of baker's yeast, in some cases up to 80-90 m"/h.

As the effluent and the yeast concentrate leave the separator in pipes under pressure it is possible to in-stall a number of separators in the plant even on the ground floor, without the use of separate pumps, inter-mediate mixing tanks, etc.

The yeast concentrate discharged under pressure from one separator stage can easily be fed direct into the wash-water pipe leading to the next separating stage. Due to the presence of a paring disk countercurrent washing is easily accomplished.

Y/8 The FEUX type separator bowl is designed for "clean-ing-in-place". For this purpose a springloaded valve is mounted at the periphery of the bowl. This valve is closed when the bowl is running at full speed. When the speed drops to a certain limit, the valve opens and the contents of the bowl are discharged. The bowl can now be flushed with warm water or some cleansing agent so that yeast deposits inside are removed. The flushing effect can be increased by in-termittent feed of water so that the liquid in the bowl slides. To clean the central chamber, warm water is flushed backwards through the yeast concentrate pipe. The water then penetrates through the paring tube into the central chamber which is thoroughly flushed. As the power consumption of this machine varíes from about 45 to 75 hp depending on the load, it has been found advantageous to use two alternativa frames, viz.: A. Frame of conventional type where the bowl spin-

dle is driven by means of a worm gear. The frame is of the same design as that used for the type FESX 412B-30. The machine should be equipped with this frame when its capacity does not exceed 35-50 m 3/h depending on the yeast concentra- tion. Max. size of the motor is 50 hp and drive from a direct coupled foot motor is recommended. The motor and separator should be mounted on the same base plate. The denomination of this machine will be FEUX 412U-35.

B. Frame of a sturdier design where the spindle is driven by a fíat belt from a vertical motor. An automatic lubricating system is included in the construction. This frame should be used when the capacity exceeds 50 m"/h. A suitable motor size is 60-75 hp. A machine equipped in this way is used for instance for the separatjon of baker's yeast, and the denomination of the machine is FEUX 412U-31.

FEUX 412U-31.

o

FEUX 412Y-30 This machine has a semi-closed B cover, the wort thus being fed to the machine through a pipe. The bowl is similar to that of the FEUX 412U-30 el -id is thus equipped with an adjustable paring tube for the yeast concentrate.

It differs from the FEUX 412U-30 in that it has no paring disk for the effluent, which leaves the machine via a "power recovery ring" through an open outlet. As the bowl has the same high separating efficiency as the FEUX 412U-30 bowl this machine has proved to be most suitable to meet high demands on capacity in the production of baker's yeast.

Due to the aforementioned peripheral bowl-wall valve, opening at low bowl speed, the machine offers the possibility of "cleaning-in-place" without dismantling. As there is no paring disk, power consumption is com-paratively tow. Normally, the machine is therefore deli-vered with standard frame with worm gear, equipped with a 50 hp foot motor mounted on a common base plate. Type denomination FEUX 412Y-35.

o

FEUX 412Y-30

The machine can also be fitted with a fixed paring tube for the yeast concentrate and the denomination will then be FEUX 412X-35.

FEUX 412T-30E This separator is almost identical with the FEUX 412 U-30, but is in gastight execution and has a fixed paring tube.. It is mainly intended for the separation of brewer's yeast which is often separated under air-free conditions with CO2 gas. Therefore the machine is equipped with a special inlet for CO2 gas and it is provided with seals to prevent gas from leaking out into the surrounding atmosphere. The machine is nor-mally delivered with a standard frame with worm gear. A 50 hp motor is recommended, and separator and motor are mounted on a common basé plate. The possibility of cleaning-in-place te same for this machine as for the others in the same series.

The efficiency of a yeast separator is often stated only by one figure representing the max. capacity of the machine. The throughput capacity depends, however, on the types of yeast, the wort, and the concentration of yeast cells in the feed and in the concentrate. It is a well-known fact that the yeast and the wort are differ-ent in different yeast factories. Consequently, the re-sult obtained with a given type of separator is not the same in every factory.

Especially when fodder yeast is treated, the variations are very great, and the throughput capacity can be much lower than for baker's yeast. Bacteria are still more difficult to separate than fodder yeast. There are many different ways of characterizing the yeast content in wort or in yeast cream. The most common methods of expressing the yeast content are:

Per cent by volume of press-yeast Per cent by weight of press-yeast Per cent by weight of dry substance (DS) Grammes press-yeast per litre Grammes dry substance per litre

The percentage by weight of dry substance in com-pressed baker's yeast (press-yeast) containing water varíes in the range 24-32 % dependent on the yeast strain. Most usual figures are 25-28 %. (There should not be any confusion at the fact that yeast for sale often has a DS-content around or aboye 30 %, particu-larly in the tropics and the USA. Yeast with such a high percentage of dry yeast solids is usually produced by the so-called salt method). For fodder yeast grown on spent sulphite liquor the DS-content can be as Iow as 16-18 %.

Some manufacturers prefer to give th4 yeast content in degrees Balling, which, however, cannot be gene-rally related to the true content of yeast solids.

The degree Balling refers to the density of the yeast wort and is thus also dependent on the type of yeast and the density of the wort itself, which in the first stage contains solids in solution.

The Alfa-Laval Company has chosen to characterize the yeast content by a figure expressing the percent-age of dry substance and in all diagrams included in this Technical Bulletin this method has consistently been used.

The density or press-yeast is about 1.10 g/cm 3 which figure can be used approx. for all conversions between various ways to express yeast contents. Thus a wort containing 120 g/I press-yeast corre-

12 sponds to

1.10 --10'9 % by vol. press-yeast and

89.1 % by vol. extra-cellular liquid. Its density is 120+891

1,000 = 1.011 g/cm3. If the DS content of the

press-yeast is 27 %, the 120 g/I corresponds to 120 x 0.27 -= 32.4 g DS/I or approx. 3.2 % DS by weight.

A yeast cream containing 75 % by weight press-yeast thus corresponds to 75X0.27 = 20.2 % DS or 75 / 75

+ 25) 1.10 / 1.10 = 73 % by vol. or

/000

750+250 750 = 805 g/I press-yeast. /

1.10 ConverRinn rhar+0 t_

Capacities s78

Calculating separator performance and nozzle size As all the yeast contained in the feed shall leave the separator through the nozzles the volume of the yeást concentrate can easily be calculated, provided certain figures are known, viz.,

(a) yeast concentration in feed (b) desired yeast concentration in concentrate (c) permissible loss with effluent wort

Knowing the nominal nozzle discharge rate of a cer-tain separator, the correct nozzle size and the perfor-mance of that separator can be calculated. Table 2 below indicates (in l/h) for different Alfa-Laval yeast separators the discharge through a nozzle with 1 mm diameter as well as through 1 mm 2 nozzle area. All figures given are valid for water and for a thin yeast cream. For a very thick yeast concentrate these figures should be reduced by 15-20 per cent. All Alfa-Laval yeast separators mentioned below are provided with 12 nozzles.

Table 2

Type of 'upare'. Discharge d'Input» es. Ponle

of 1 mm che. (VA) I mm aros

860.• bou( apear,

DVK 4 135 172 9.500 (SF) OX 209-308. 13 a S 210 267 5.150 DX 309-30 A 250 316 6.050 SLOX 209-308 190 242 5.150 FESX 4128/5-33 330 920 4.600 FOSO 412U/X/Y-30 160-120• 209-153• 5.100

dobouding no pumbon of 9dhttabl• paring tubo.

The flow through a nozzle is proportional to the cross-sectional area at the orifice and, thus, also proportion-al to the sauare of the diameter. Let us give an example that may serve as a convenient means of explaining the way to carry out a calculation. Suppose that you have a wort containing 8.0 per cent (by volume) press-yeast which is to be concentrated to 70 per cent (by volume). Permissible losses amount to 0.05 per cent. With a DX 309-30B this result can well be achieved at a feed rate of 34,000 l/h. As practically no yeast is lost, the volume of feed and the volume of yeast cream are in inverse proportion to their yeast concentrations. Consequently, a feed of 34 m3/h with 8 per cent of yeast will give 3.88 m 3/h of cream with 70 per cent (by volume) of yeast /34x8

= 3.88).

If 12 nozzles are used the flow through each one will be 3,880 : 12 = 325 l/h.

As mentioned aboye the flow through a nozzle is pro-portional to the square of the orifice diameter. As seen from the table a 1 mm diameter nozzle in a DX 309-30B separator gives 250 l/h. Consequently, the proper diameter of the nozzle in this case will be

V 1-25

. \I 1.30 = 1.14 mm or 1.15 mm 250

which is the nearest to 1.14 mm so far manufactured. Considering the use of 6 nozzles only, at a flow of 3,880: 6 = 750 l/h through each,

750

250 The nearest size kept in stock is 1.8 mm dia.

The aboye given example will certáinfy have given you an idea how to calculate suitable riZzzle sizes. In order

to get optimum results with your Alfa-Laval yeast sepa-rators we definitely recommend you to carry out a thorough trimming of the machines. After an adequate trimming you may well find the output of your ma-chines to be bigger than originally stated by us. For an easy trimming we can supply you with a special trimming set consisting of 25 brass nozzles, 2 single-handed reamers, and one set of nozzle gauges. The nozzles are prebored to a diameter of 0.4 mm and can then be reamed to a desired diameter to fit the nozzle calculation.

After such a trimming it is recommendable to order from us a set of nozzles of stainless steel, possibly with sapphire jets of the exact diameter found by the trimming.

For detailed intormation on the most suitable way of trimming an Alfa-Laval yeast separator we refer to the Instruction Manual delivered with each yeast separa-tor.

Power consumption The power consumption of a yeast separator running at full speed depends on the feed and nozzle flow rates. For practica! purposes a power consumption calculation is made up of three components: The first part represents the losses due to mechanical friction of various kinds and is independent of the throughput. This is called ''idling power" below. The second part is due to the energy lost with the clarified liquid thrown out over the discharge ring or pumped out by the pa-ring disk. This is called "effluent power" below. The third part is the energy lost with the concentrate thrown out from the nozzles or passing through the paring tube and is mentioned as "nozzle power" be-low. The two latter components are proportional to the amount of liquid flowing the two ways and that is the reason why they -are given below per 1,000 I/h. For the various typés of separator we give the following figures:

Tabla 3

Sepatatot denonunabon :Ming power

hp Effluent power

hp/1000 VA

NortI9 1.0.1 hp/1000 I/O

or paring tu. power

DVK 4 1.7 0.16 025 SFDX 209-30 S 05 0.41 060 (SF)DX 309-30 5.5 948 0.82 SLOO 209-30 52 060 0.80 FESX 4I2 9-30 63 0.30 1.15 FESX 412 S-30 6.3 045 1.15 FEUX 412 11-35 FEUX 412 U-3I FEUX 412 0-30

6.3 63 6.3

0.66 O 72 0.33

2.7-1.65' 2.7-1.65' 2.7-1.85'

(14..1.9 on Pbtubon of adrystable peno° tubo .

Idling power 6.3 hp 51,000

Effluent power, x 0.33 = 16.8 hp 1,000

000 Nozzle power, 9,x 2.7 = 24.3 hp

1,000 Total power 47.4 hp

= 1.73 mm

In a machine with a paring disk the power consump-tion varíes with the back-pressure. The figures indica-ted aboye for the S and U-machines are valid at low back-pressures. At high throughputs the increase in effluent power consumption at max. back-pressure will be about 10 %.

As an example we will calculate the power consump-tion of the separator FEUX 412Y-30 at a feed rate of 60 m 3/h and a nozzle flow of 9 m 3/h:

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Io1J $4

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