CN102012177A

CN102012177A - Shell-and-tube heat exchanger

Info

Publication number: CN102012177A
Application number: CN201010277173XA
Authority: CN
Inventors: 罗兰·法伊尔纳; 琼克·布特格扎卡里亚斯
Original assignee: Krones AG
Current assignee: Krones AG
Priority date: 2009-09-08
Filing date: 2010-09-07
Publication date: 2011-04-13
Also published as: BRPI1003318A2; DE102009040558A1; US20110056663A1; EP2299227A2; EP2299227A3; ES2691257T3; HUE041374T2; EP2299227B1; PL2299227T3

Abstract

A shell-and-tube heat exchanger (W) for the treatment of juices and juice-type foodstuff products with medium to high viscosity, with at least one jacket tube (1) containing at least one inner tube (2), whereby the inner tube (2) and/or the jacket tube (1) is or are formed as a swirl tube with multi-start spirals running like a thread at an angle (alpha,alpha1) to the tube axis (X), a crossed and twisted tube with crossing spirals (D1,D2) at least essentially symmetrical to the tube axis, each with an angle (alpha,alpha1) of incidence between 67 DEG and 72 DEG to the tube axis (X), i.e. with an angle (beta,beta1) of twist of 23 DEG to 18 DEG to the tube axis, is used as an inner and/or outer tube (1,2). The spiral depth (T) is about 0.8 mm to 1.2 mm.

Description

Shell-and-tube exchanger

Technical field

The present invention relates to a kind of shell-and-tube exchanger of the preamble type according to Patent right requirement 1 and the inner tube and/or the sleeve pipe of this type shell-and-tube exchanger.

Background technology

Be used to handle shell-and-tube exchanger, wherein use and reverse inside simply and/or exterior tube is known from DE 60019635T2 with fiber and/or particle juice.In inner tube, torsion angle is presented at about 45 °, but respective tube axis torsion angle in sleeve pipe is illustrated as about 75 ° in each case.Have under the situation of this shell-and-tube exchanger, shortcoming is in order to increase the heat conduction, can produce the pressure loss of essence under the long-pending constant situation of liquid contact surface, and the boundary layer of liquid is directed to strong rotation at the spiral place, spiral extends with identical torsion angle with respect to the tubular axis line.This needs very high feed pressure, and feed pressure is unfavorable for product, and is unfavorable for the processing of the product in shell-and-tube exchanger.

From DE 10256232B4, recognize that shell-and-tube exchanger is used for milk and dairy product that UHT handles pasteurization.Sleeve pipe is a plain tube.Only inner tube can be to intersect torque tube, and spirals wherein many-head, opposition mutually are with longitudinally to the incidence angle place intersection between 25 ° and 35 ° on the tubular axis line, promptly with the torsion angle between 65 ° and 55 °.This angular range mates especially be highly susceptible to forming sedimental milk and dairy product on contact surface.Thereby spiral is polished with electrochemical method.The combination of two kinds of methods causes forming milk and the sedimental optimal inhibition effect of dairy product, can make shell-and-tube exchanger have longer service time and does not need to clean loop.Mentioned 45 ° of torsion angles are considered to the best and are used for the heat conduction, but yet it cause unacceptable great deal of milk and the sedimental formation of dairy product.Consider to suppress product-special sedimental formation, incidence angle between 25 ° and 35 ° and extra surface treatment thereby the best are used for milk and dairy product, but when under the situation of 45 ° of the global angles that becomes with respect to the tubular axis line, they have provided the unfavorable relation between the excessive increase of the pressure loss in increase heat conduction that obtains and fluid.

Summary of the invention

The object of the present invention is to provide a kind of shell-and-tube exchanger of the aforementioned type of mentioning, and the sleeve pipe and/or the inner tube that are used for such shell-and-tube exchanger, low when handling especially, in or when full-bodied juice or juice type food product, although the time of repose of the weak point of its realization the best under the situation that medium feed pressure is only arranged and little heat exchange surface.This is applied to the whole liquid foods in this range of viscosities.

This group purpose is realized by the technical characterictic of Patent right requirement 1 and Patent right requirement 10.

Though, in shell-and-tube exchanger, use at least one intersection torque tube (being used for sleeve pipe and/or each inner tube), because realizing heat conducting essence, cross-helicity increases.Yet, with intersect-reverse under the situation that the relevant pressure loss increases, be 72 ° to 67 ° by restriction with respect to the incidence angle α of tubular axis line and become 18 ° to 23 ° torsion angle with the face that produces by this incidence angle with respect to perpendicular to the tubular axis line, attainable heat conduction is increased in through-flow (through-flow) and brings best relation, promptly arrive relative acute angle, though the feed pressure that it is only medium causes less heat exchange surface.In other words, owing to use this class intersection torque tube, shell-and-tube exchanger needs relatively little heat exchange surface and thereby short transmitting range.Under the situation of juice and juice type food product, be easy to form the product deposit and be second main, because have in use under the situation of intersection torque tube of certain smooth torsion angle, principal element is to be not easy to adhesion owing to smooth torsion angle and to collect as pulp, fiber or the particle of the product composition of juice or juice type food, thereby replaces further flushing fast.And it is possible cleaning to thoroughly cleaning by this way.

In preferred embodiment, in the axial section of pipe, each spiral has slotted recess, has rib on the recess both sides, and rib has approximate wedge-shaped cross-section, between rib, has the spiral degree of depth between about 0.8mm to 1.2mm in recess.Interaction between the relatively flat torsion angle and the medium spiral degree of depth causes, even under medium feed pressure situation, the best that concerns between the increase of the hot pressure loss of conducting and causing of increase is used for the juice and the juice type food product of basic, normal, high viscosity.Preferably, recess and rib are arranged on the surface of contact product.

In preferred embodiment, the width of seeing recess on tube axis direction is the integral multiple of the spiral degree of depth.Between Ying Zaiyue 5.0 and the 20.0mm.Recess is a cavity wide relatively on its adjacent rib, and the structure division of product further washes apace and it also realizes the thoroughly cleaning of cleaning, for example is used for the change of product.

In order to utilize the effect of cross-helicity best, two multi-head spirals cover the surface of pipe fully.

In preferred embodiment, form the module of shell-and-tube exchanger as the sleeve pipe that has a plurality of intersections and reverse the intersection torque tube of inner tube.This module can prolong 3.0 in an advantageous manner, 6.0m or more, and advantageously in conjunction with several modules of series connection, is used for handling the product at shell-and-tube exchanger.

In another embodiment, only inner tube is the intersection torque tube with relatively flat torsion angle, for example, if in the fluid course of heat transfer medium use between sleeve pipe and inner tube.

In another embodiment, sleeve pipe has the recess of two spirals on the inboard of pipe, however for example, depend on product flow along the surface of pipe, each intersects and reverses the recess that inner tube has the spiral on the outside or inboard.

Shell-and-tube exchanger especially is beneficial to and is applicable to juice or the juice type food product of processing greater than about 5mPas viscosity.

Be used to handle relevant product, two distinct methods are used, promptly or the recuperation method, wherein product and product intersect that torque tube is separated and processed by each, for example in adverse current, perhaps at heat transfer medium and product against the method that torque tube separates of intersecting by separately, thus, preferably, intersect torque tube two spirals recess in the face of product.

The intersection torque tube of using is stainless steel tube preferably, and on pipe, two screw actions are on the fluid on the inside and outside tube-surface.

Description of drawings

With reference to accompanying drawing, describe the specific embodiment of the present invention in detail.Description of drawings is as follows:

Fig. 1 illustrates the heat treated shell-and-tube exchanger that is used for juice or juice type food product, has the example of intersection torque tube as the module of sleeve pipe,

Fig. 2 illustrates another embodiment of module, and this module has at least one inner tube as the intersection torque tube in smooth sleeve pipe for example,

Fig. 3 illustrates another embodiment of module, and its middle sleeve and each inner tube all form the intersection torque tube.

Fig. 4 illustrates and intersects the detail section of tube wall of torque tube, have in the face of inboard two helical recess of pipe and

Fig. 5 illustrates the cross section of the tube wall of intersection torque tube, has the recess of two spirals on the outside that is positioned at pipe.

The specific embodiment

Fig. 1 illustrates the module M of shell-and-tube exchanger W, its be used for heat treatment to high viscosity (for example, viscosity is greater than 5mPas) juice or juice type food product, shell-and-tube exchanger W comprises sleeve pipe 1 and at least one approximately axial inner tube 2, and it is inboard and separate from the interior wall of sleeve pipe 1 that inner tube 2 is contained in sleeve pipe 1.In shell-and-tube exchanger W, module M and other module (module that for example, does not have illustrated identical or similar type) thus in conjunction with forming the processing section that certain transmits length.Product or handle according to recuperation (recuperative) method, promptly for example separated by product by inner tube 2 products, perhaps handle according to the method for wherein using heat transfer medium (steam or water), heat transfer medium for example separates by relevant inner tube 2 with product thus.Relevant method is preferably operated in adverse current or one-way flow.

Sleeve pipe 1 in Fig. 1 forms the intersection torque tube with multi-head spiral D1, D2, multi-head spiral D1, D2 are intersected with each other with respect to tubular axis line X substantial symmetry, thus, have with respect to the incidence angle (α of tubular axis line (X) between 67 ° and 72 °, α 1) become 18 ° to 23 ° torsion angle (β, β 1) with the face that produces by this incidence angle with respect to perpendicular to the tubular axis line.The torque tube of intersecting is, for example, is similar to shown in Fig. 4, has in the face of the inboard recess 3 of pipe.In Fig. 1, each inner tube 2 or plain tube or similarly be to have basically with respect to the mutual cross-helicity of the bull of tubular axis line X symmetry and have the intersection torque tube of the torsion angle β 1 between 18 ° and 23 °.

Module M is in the embodiment of Fig. 2, and sleeve pipe 1 is a plain tube.Compare, each inner tube 2 that is included in the sleeve pipe 1 is with respect to tubular axis line X substantial symmetry and has with respect to the mutual cross-helicity D1 of the bull of the incidence angle α 1 of tubular axis line between 67 ° and 72 °, the intersection torque tube of D2.Spiral D1, D2 are bulls, although thereby steep relatively incidence angle α 1 (torsion angle β 1 is between 18 ° and 23 °), tube-surface offers product completely, mainly strengthens heat conducting macrostructure, and is increasing the heat conduction and owing to obtaining best between the pressure loss of spiral.

Module M is in the embodiment of Fig. 3, the intersection torque tube with respect to mutual cross-helicity D1, the D2 of tubular axis line X substantial symmetry with bull is used for sleeve pipe 1 and each inner tube 2, thus here with perpendicular to the torsion angle β that face became, the β 1 of tubular axis line X between 18 ° and 23 °.

With 18 ° to 23 ° the torsion angle β, the β 1 that become perpendicular to the face of tubular axis line mean relative each β of tubular axis line X fore-and-aft plane, β 1 spiral incidence angle α, α 1=90 °-torsion angle=α, α 1=67 be ° to 72 °.

Fig. 4 illustrates that cross-helicity D1, the D2 by each intersection torque tube forms the macrostructure of sleeve pipe and/or

inner tube

1,2, and spiral D1, D2 are presented on the inboard and the outside of pipe.In Fig. 4, cavity type recess 3 is limited by wedge ribs 5 basically in each case and has spiral degree of depth T between 0.8mm and 1.2mm, and cavity type recess 3 is provided with in the face of tubular axis line X and follows another at axial one.The width B of each recess 3 is integral multiples of spiral degree of depth T, preferably between 5.0mm and 20.0mm.On the outside of pipe and corresponding recess 3 spherical dome 4 is set, axially limiting by about v-depression 6.In not having illustrated alternative, rib 5 and groove 6 can be circular, for example for pipe cleaning easily.Rib 5 or groove 6 and recess 3 and dome 4 extend as screw-like with incidence angle α, α 1 on whole inside, each exterior tube surface, and periodically intersected with each other.

In the embodiment of Fig. 5, the torque tube of intersecting is shown as overcoat or

inner tube

1,2, and its upper recess 3 is presented on the outside of pipe (promptly facing away from tubular axis line X).In this respect, spherical dome 4 and groove 6 are in the face of tubular axis line X.Spiral degree of depth T is between 0.8mm and 1.2mm.Torsion angle β, β 1 are becoming between 18 ° and 23 ° with face perpendicular to tubular axis line X.Intersection torque tube shown in Figure 5 can be advantageously used for inner tube 2, if for example, product flows between as the outside of sleeve pipe designed in Fig. 4 and inner tube 2.If the use heat transfer medium flows in the fluid course of heat transfer medium between sleeve pipe 1 and inner tube 2, the intersection torque tube that is similar to the

inner tube

1,2 of Fig. 4 is easy to form.

The incidence angle α that has 67 ° to 72 ° from use, α 1 and be used for 5.0mm and 20.0mm between the intersection torque tube of the spiral degree of depth T between 0.8mm and 1.2mm of coil width B, can be by cross-helicity technology or the coefficient of heat conduction obtainable increase the heat conduction and for the through-flow increase pressure loss of having to accept that is used for medium or high viscosity juice or juice type food product between produce best relational result, thereby, the time of repose of the weak point in shell-and-tube exchanger or short relatively transmission section enough are used under the situation of shell-and-tube exchanger W, and application process separately (recuperation or use heat transfer medium) needs relatively little heat exchange surface be used for only medium feed pressure.

Claims

1. one kind is used for handling and has to the juice of high viscosity and the shell-and-tube exchanger (W) of juice type food product, it has at least one sleeve pipe (1) that comprises at least one inner tube (2), wherein inner tube (2) and/or sleeve pipe (1) form and have multi-head spiral (D1, D2) vortex pipe, multi-head spiral extends with torsion angle such as screw-like with respect to tubular axis line (X), it is characterized in that, as inside and/or exterior tube (1,2), the torque tube of intersecting is provided with cross one another spiral (D1, D2), (D1 is D2) at least with respect to tubular axis line (X) substantial symmetry for spiral, each spiral (D1, D2) have with respect to the incidence angle (α, α 1) of tubular axis line (X) between 67 ° and 72 ° and become 18 ° to 23 ° torsion angle (β, β 1) with the face that produces by this incidence angle with respect to perpendicular to the tubular axis line.

2. shell-and-tube exchanger according to claim 1, it is characterized in that, each spiral (D1, D2) have cavity type recess (3) in cross section, rib (5) is in the both sides of recess (3) and have about wedge-shaped cross-section, between rib (5), in recess (3), the spiral degree of depth (T) with about 0.8mm to 1.2mm, and preferably, described recess and rib are arranged on the surface of contact product of described sleeve pipe (1) and/or inner tube (2).

3. any one the described shell-and-tube exchanger in requiring according to aforesaid right is characterized in that watch, the width (B) of recess (3) is the integral multiple of the spiral degree of depth (T) on tubular axis line (X) direction, preferably, about 5.0 and 20.0mm between.

4. any one the described shell-and-tube exchanger in requiring according to aforesaid right is characterized in that, (D1 D2) covers the surface of described pipe fully for two multi-head spirals.

5. any one the described shell-and-tube exchanger in requiring according to aforesaid right is characterized in that, described sleeve pipe (1) comprises as intersecting a plurality of intersections of torque tube and reverses inner tube (2) and form the module (M) of described shell-and-tube exchanger (W).

6. any one the described shell-and-tube exchanger in requiring according to aforesaid right, it is characterized in that described sleeve pipe (1) has spiral (D1, recess D2) in the inboard of described pipe, and each intersection is reversed inner tube (2) and have spiral (D1, recess D2) on the outside or inboard.

7. any one the described shell-and-tube exchanger in requiring according to aforesaid right is characterized in that viscosity can be handled greater than juice and the juice type products of about 5mPas in described shell-and-tube exchanger (W).

8. any one the described shell-and-tube exchanger in requiring according to aforesaid right is characterized in that, by intersecting under the situation that torque tube separates separately, handles described juice or juice type products according to the recuperation method at product and product.

9. any one the described shell-and-tube exchanger in requiring according to aforesaid right, it is characterized in that, handle described juice or juice type products according to heat transfer medium and product by the method that torque tube separates of intersecting separately, preferably, recess (3) is in the face of described product.

10. be used to handle inner tube and/or sleeve pipe (1 greater than the shell-and-tube exchanger (W) of the juice of 5mPas viscosity or juice type food product, 2), it is characterized in that, has symmetrical with respect to tubular axis line (X) at least basically mutual intersection multi-head spiral (D1, D2) intersection torque tube is used as inner tube or sleeve pipe (1,2), and incidence angle (α with respect to tubular axis line (X), α 1) between 67 ° and 72 °, and (D1 is D2) between the about 0.8mm to 1.2mm of the spiral degree of depth (T) in the recess of Xing Chenging (3) by spiral.