DE1619682A1 - Thin film evaporator - Google Patents

Description

Artisan Industries, Ine. (MS 570 516 '"- pwlo 5.8 x 19ββ

Waltham, Mass., V.St.A, ⁶ ^ ⁶⁰ - ^ 959)

. Hamburg, July 28, 1967 "

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The invention relates to a Bifansehiohtverdaropfer. for the treatment, conversion or processing of liquids, suspensions, Aufschllteaungen, Eüpilsionsn ^ LSsimgen, Sehnelz-an, etc. «In particular, the invention relates to a thin. Sehichtverdaiapfer or fractionator with e'ittem ring on the outer edge of the red © rblEtt © jr ^j seweo of the throughput of the masses treated in the ITerdaBpfer.

In the case of thin-film evaporators with a horizontal or mounted axis, it is often desirable to regulate the load of the material to be processed through the ¥ erdasapfor, so that it _: actually appears as a thin film on the inner wall · This is particularly important when processing viscous material slides along the outer wall and does not form a thin film »Furthermore, liquid feed products tend to» see in evaporators with a horizontally mounted axis to suck into the inlet side of the feed opening, which means that this part of the material is heated too long «whereas in evaporators it is inclined The liquid product is often stored in the evaporator at or after the inlet or outlet

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There are various suggestions us these difficulties su eliminate "So Beispielstrelse are conical or abgeschrggte Verdsspfei · with the inlet opening on the far side of the Verdasapfers with scteanatenfSraaigen BlSLtfeem sn of Austrifctsssite feekennt, iaa the su treated viscous material, for Ämstritfcson & s za press (cf. USA Patent Bulletin 5 253 643). In addition, there are known webs attached to the inner wall and near d © fis projections, whereby the material from Sintrotsn is to be prevented from entering the YerdaaspferkaBsser (vörgi, USA-Patesitsclirift 3 2 ^ 1 391 wnd ^v 3 228% 53). None of these ¥ orri @ atiaogen makes it possible 5 © - but, atm. To lead Produi'ttenstrcss as df yien Fiio through the evaporator, but only teach "how to legally umstSßdlich prevent the flow of Materialstroiacs in the Daiapfkaimer.

The task of the present invention is therefore to be One or more continuous messages occur in a connection Provide rings »those on the outer edges of the rotor blades are attached to allow material flow through the device to regulate and especially with a sloping one Evaporator the Durohtrltt of Materiel from the closed

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Prevent chamber in the neighboring Dampffeamaer ay » Furthermore, at least one continuous ring should be attached to the Be attached to the outer edge of the rotor blades «whereby this Ring placed near the outlet end of the evaporator should be * do a change of direction of the treated To allow material in the direction of the exit nozzle « in particular when pumping viscous Material «.

The thin digestion device according to the invention consists of a rotor atit arranged in a camshaft in general, radially running and axially arranged rotor blades, which extend from the rotor axis to almost the inner wall of the chamber, as well as outflow and exit for the product and © inem aa 'am. Ring attached to the tips of the rotor blades in order to close the flow of the material to be processed in the pre-seal . regulate This continuous very eel ring or band can generally be formed from thin ring-shaped pieces between each blade, the ring going around the entire circumference at the ends of the rotor blades and essentially cutting off with the edges of the rotor blade tips and thus the flow of material and forms a cut strip of material on the leading side of the sheet.

The ring generally intersects with the edge of the Rotor blade tips, so that a more even, but ' small continuous distance between the rotor blade tips remains free in the ring and the inner wall of the closed chamber. Such rings are between attached to all rotor blades and only allow that the liquid material forms a turbulent or thin film between the 'bit tips' and the inner wall of the Chamber forms and in this way through the device is directed »This. Arrangement, allows in addition and especially if it is arranged in the area of the exit side, regulating or throttling * the air passing through Materials, either in or out of the evaporator, can also be used, especially in the case of viscous materials Ring a change in the direction of the radiation, for example on the exit side to allow the material to come out its horizontal transport direction in the evaporator in another direction, e.g. downwards in the direction of to guide the outlet opening. The hanging can be worked so that the front edge, i.e. the edge, is against soft the material flows, is essentially perpendicular to the rotor axis or inclined so that the Mater! 1 gets a certain direction; the area can also be curved or shaped.

The ring must be around the entire outer circumference of the rotor «

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leaf tips extend and in addition a complete Ring or circle, i.e. it must essentially lie in the same continuous radial plane so that the machined material does not pass the hing, without there being a thin film on the inner wall of the Chamber forms. When connected to the rotor blade tips Screw blades allow the material to flow without a different surface necessarily forms. Xm present In this case, the 4-ring regulator can be used with both cylindrical and conical evaporators, either in unidirectional flow, i.e. when liquid and vapor are in the same direction flow or upstream if liquid and steam in opposite directions Goiter. Furthermore, the rings can be anywhere along the LShge the rotor blades to be attached / they are particularly suitable for chemical reactions that take place in the Device done * and either to the material throughput to accelerate or decelerate, being the residence time of the reactants accordingly is set. When the vapor chamber of the evaporator is on the inlet side or on the outlet side, the rings can control the flow of the machined or fed Prevent material into the steam chamber, and thus serve a better control or ZurttekdMm-

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solution without constrictions on the inner wall of the evaporator required are.

This ring is especially for horizontal vaporizers or inclined axes and radially adjustable rotors suitable «because you get by the movement of the rotor blades along the rotor axis the rings as desired within of the supply «or exit area can move. This results in a special adaptability when controlling and regulating the material flow Outlet side and you can prevent liquid material enters the steam chamber .. The number and type of on the The rings used in rotor blades depend on the material being processed and the results desired. These rings come from one piece with the leaves be or come welded or screwed to this Or be attached to one of the rotor blades in another © way.

It is desirable to have rings of equal width and thickness to be used so that there is no unbalance and excessive vibration develop. The curved segments on the axial

_BW > whether * »" * ·

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Level between each rotor blade can go inwards Direction to the rotor axis a different distance to have. This distance and the inclination of each curved part of the ring depends on the amount of 'to be cut off Materials. Most of the time the bent parts have a uniform incline and run inwards, i.e. they have a height of β - 24 am or correspond to the strength of the Rotor blades “With very viscous materials” the over If very tight rings flow away, it is often desirable to have a To use a ring with a slightly larger height, i.e. a ring expanding inward at a greater distance *

During the operation of the rotor blades provided with the ring, a thin layer of material forms which collects on the "feed edge of the ring." thin filra on the wall 1 * 5 - 6 inches thick, while the material sections 2 to 5faefo contain as much material. This additional weight, a force is generated. To move in the dünnschlchtige material. The ring prevents the material from flowing over the ring and brings this material on the ring as a thin film against the inner wall of the

BATH ORIGINAL

Chamber. This does not have to be leaner if beveled Proceedings according to patent application A 56 297 IVc / 12a be used, with the material strips over the Edges flow and thereby allow some material to pass through and not the formation of a thin film on the Ensure inner wall. Of course, inclined surfaces can be used or sows on the rotor blade era together with hangings used to provide an additional control of the to be processed Materials to enable.

In a special Ausftfisrungsforat the rings are inclined either forwards or backwards to change direction of the material. The rings are, for example, made up of evenly curved segments formed, which are attached between the rotor blade tips and are substantially perpendicular to the rotor axis. The front surface of the arcuate segments or rings however, it can be angled, for example in the direction of the rotor axis if there is a change in the flow direction, for example from the horizontal at the product outlet in a direction towards this outlet is desired. As a result, the ring can be used first to form a thin film on the inner wall and secondly to prevent the material from entering the evaporation chamber and thirdly, uo the material

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river at the? Regulate entry or exit openings below *

In the following, the invention will be explained in more detail using vein drawings * Es-aselgcsns. ■■ -.;: = ";;"; ^: ■ "/ .- ■

Pig. 1 a cut part view through the invent «

FIG. 2 is a section along line 2-2 of FIG. 1 shown device;

Fig. 3 shows an enlarged © representation of the Bingo, whose Vordörfläöh © is inclined , .um

Fig. ' 4 a section through a ring "with another" . Shape of Eotorblatta

In the case of the * shown in the figures. j ^ rlinärissfeen Rotations «dtinnschichtverdaispfer rait horizontal Aohs® is eraeogt during the processing Baaapf" and. in the same direction; with the product transported p®r VerdaBsj? f @ 2 · Id has a closed cylindrical Karaaer 12 and is in the main part through a dumbbell 14 is enclosed, in order to regulate the temperature with steam, cold water or other panic agents . The chamber 12 has an inlet opening 16 at one end and an outlet opening 18 at the other

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Steam exits from the steam chamber 22 located next to the product space of the evaporator at 20. The two end or end plates 24 and 26 of the chamber 12 hold the horizontally inclined tubular rotor 28, which is arranged axially centrally and which leads from the one end of the chamber through the steam chamber 22. The rotor 28 is driven in any desired way and usually extends beyond the end plates 24 and 26; it is held in bearings 34 and 32 and sealed by packings 30 and 36. The rotor shaft 28 can be axially displaced or adjusted in the usual way, for example by means of a spindle arrangement. Several rotor blades 38 extend radially outward from the rotor shaft 8, the tips or edges of which are a small, but smooth, very narrow distance from the inner wall of the iaamev 12 have, whereby a thin film of material on the inner wall of the Xaräaor 12 is generated when the rotor shaft 28 rotates.

Between these rotorb ^ sttem 38? Ln $ narrow, even, ring-shaped © Bifcjdar 40 attached, which one result in a continuous circular ring. The height * this ring " depends in part on the thickness of the * rotor blades · The Leading edges of the annular BKzider 40 run at right angles to the rotor axis and close old the outer edge of the rotor blade tips, so that the entire ringuafang

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is evenly spaced from the inner wall · Overall are five rings 4j5, 44, 46, 48 and 50 on the Rotor blades ^ attached. The Ring® 44 and 46 cause « that the material forms a thin film on the inside wall of the chamber forms, while shortly before the exit side 18 arranged ring 48 the material both to a thin Film processed as well as its exit from the outlet 18 allows. The ring 42 prevents the fed Material accumulates on top plate 26 while the hanging 50 on the outer edges of the rotor blade Transport to the BaEpiäanssar prevented · '.if; the. rotor blade is axially adjustable, the hinge 48 and on both sides of the outlet 18 serve as a valve slide. a shift of the "rotor nach.rschts" is the hung; 48 over the outlet 18 and causes a.

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5 shows rings 48 and 50, the arcuate bands of which are inclined at one angle to the vertical and to the axis of rotation, so that a "radially outward movement of the thin film formed is produced in the direction of the liquid outlet; for example can the ring opposite this: level have a wteikel, yori .. # 5 ^o .

BAD -.ORiCKNAl, 10S824 / 1334

During operation the liquid Out becomes »β · Β. © ine low viscosity liquid through the unit ?! Tfcsöf teams 16 by means of pumps or gravity transfer or introduced under vacuum, the resulting low volatile material being withdrawn through the outlet opening 18 and the evaporated material through the steam opening 20. The rotor shaft 28 with the rotor blades 33 and the annular parts 40 circulate at high speed during processing, so that a thin film of the feed material forms on the inner wall of the hemmer 12 and is in WSrron © exchange with the steam in the jacket, so that the relatively volatile components evaporate and a thin band of the material is cut off from the ring and guided along the leading surface of the arcuate parts 40 of each ring. These cut parts form an excess material which does not deform into a thin film on the chamber wall. In operation, the rings 44 and 46 prevent the cut material from passing over the ring and instead force it to form a thin film on the inner wall 16. The ring 50 beyond the exit port 18 forms a dam and prevents small amounts of the material being processed and removed

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the other side of the outlet 18 material entered ir. step into the steam chamber. The axial displaceability of the rotor can take advantage of the Hing 48 over the Bring outlet opening 18, so that they the Aus » opening shut off »The rings decelerate during operation of course the durohydrate flow rate of the material and increase the residence time.

FIG. 4 shows a plan view of a ring of a modified form which is also arranged on rotor blades. the Rotor blades shown in Fig. 1 run axially vca The rotor and the blades are straight! she run to & ängeriohtüng, namely in axial; * Direction considered · Ss also come in or several adjusted, longitudinally twisted or very cone-shaped rotor blades are used »whereby this leaves a further flow control of the too Processed material Depending on the direction and extent the adjustment. Rotor blades old one Torwards generation can be used * υα increase the flow rate of viscous material xu, while backwards, blades dislodged the viscous material flow slower. Usually the rotors come » blades run axially, but do not need to be longitudinal «

BATH

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direction to be in line with the rotor axis, but can also, for example, at one end be placed a certain amount in front of or behind the other. Such rotor blades are gradual crossed, so that one end is offset from the other by, for example, 5-45. Entangling the Leaves introduces a new vector component into the material flowing through the evaporator.

With the mechanically assisted film vaporizers, the rotor blade tips do not touch the inner wall of the chamber and thus result in a turbulent material? Lim. However, if the material to be processed becomes very viscous during processing, the film on the inner wall cannot be circulated or become turbulent due to the rotating blade tips. In such cases, the capacity is reduced for heat "so that you increase the Rotorgeechwindigkeit and the centrifugal -kräf te should increase to enable a better Burohwlrbelung and emotion of the thin layer., Of course, detects the term" thinner PII ^"41 both turbulent than also laadnar currents. Finally, the ring arrangements can also be attached to tapering or conical thin-film evaporators.

Uetsch.

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Claims (1)

(US 3tO 516 *. Prio 5 »AUg (67-60) () Artisan industries, Inc / Waltham, Mass. /Y.St.fet Hainburg * July 28th Godfather η t ns ρ rü cn e A small diameter rotor with a rotor rotating in a chamber and connected to a drive, with several rotor blades extending radially as far as the vicinity of the inner wall of the chamber, characterized in that at the ends of the rotor blades (J8) one or more rings with the rotor blade tips cut off (42, 44, 48, 50) ^{are fixed at an even, small distance from the chamber 1} inner wall (12) ».- ■ - '" 2. Thin film evaporator according to claim h, characterized in that at least one ring is arranged in the vicinity of the outlet (18) in order to prevent a material passage beyond the outlet. - -2- 10982Ä / 1334 16196β2 > · Thin film evaporator according to claim 1 to 2, characterized marked; that the ring arranged at the outlet opening has a front edge which extends into Direction of material throughput is inclined «to to cause a change in the direction of movement of the goods in the direction of the outlet. 4. Thin film evaporator according to claim 1 to 3, characterized characterized »that the evaporator is inclined horizontally 'and devices for axial adjustment of the . Having rotor blades by axial movement of the rotor. 5 · Thin-film evaporator according to claims 1 to 4, characterized in that »a steam chamber (22) is provided» which is connected to a closed Karawer (38) »where in the steam chamber« in the outlet (20) for the steam and at least «In Ring is provided which lies between the closed chamber (58) and the * steam chamber (22), so that no material can enter the steam chamber. 6. evaporator * according to claim 1, characterized in that that one or more rotor blades have an all-round surface have little entanglement. -3- 109824/1334 ! £ 19682 7 * Thin-film evaporator according to claim - Iy, characterized in that two continuous rings (k8, 50) are provided, of which the © Ine (48) in front of the. Outlet opening (l8) and the other (fjö) is arranged behind this outlet opening. . ; 8. Thin film evaporator according to claim 1, characterized in that » that the continuous ring has a front surface possesses, which is essentially perpendicular to the rotor axis stands; (Fig. ». 9 · Thin film evaporator according to claim 1 to 8, characterized characterized in that the continuous ring (48) consists of consists of several circular arc-shaped parts, which are extend between the rotor blades and are attached to them. 10- thin film evaporator according to claim 1, characterized in that that the plane formed by the revolving ring is inclined with respect to the rotor shaft. 11. Thin film evaporator according to claim 1, characterized gekennzeiclinet, that the axis formed by the continuous ring runs perpendicular to the rotor axis Uetmü 109824/1334 4 * Blank page