DK3237116T3

DK3237116T3 - CYCLONE SEAT DIVER PIPE.

Info

Publication number: DK3237116T3
Application number: DK15820113.7T
Authority: DK
Inventors: Mejdi Zaghdoudi; Hubertus Winkelhorst
Original assignee: Khd Humboldt Wedag Gmbh
Priority date: 2014-12-23
Filing date: 2015-12-18
Publication date: 2018-12-10
Also published as: HRP20181928T1; EP3237116B1; PL3237116T3; EP3237116A1; CN107206401B; RU2664100C1; DE102014019472B4; DE102014019472A1; WO2016102369A1; CN107206401A

Description

The invention relates to an immersion pipe for conducting a gas stream out of a cyclone separator, having a cylindrical wall assembled from individual segments of identical form, wherein the segments are arranged in at least two rows which are arranged one underneath the other and which extend in each case in ring-shaped fashion around the circumference of the immersion pipe, a suspension device, which is arranged at the upper end of the immersion pipe and which is formed from suspension components and which extends in ring-shaped fashion around the circumference of the immersion pipe and which serves for the suspension of the immersion pipe, and a ring-shaped lower edge which is arranged at the lower end of the immersion pipe and which is formed from termination components and which serves for increasing the dimensional stability of the immersion pipe.

Cyclone separator s (cyclones, centrifugal separators) are used for separating solid particles contained in gases from the gas stream. For this purpose, the gas stream with the solids particles suspended therein is conducted normally tangentially into the interior of the cyclone, where said gas stream is, owing to the geometrical design of the interior space, caused to travel along a helical or conically spiraling, downwardly directed path. As a result of centrifugal forces, the (sufficiently heavy) particles are accelerated outward, and thus separated off, conducted downward and ultimately discharged from the cyclone. The gas stream, possibly with a reduced fraction of ultra-fine particles, flows upward again through the center of the cyclone. A pipe which extends into the cyclone from above, the so-called immersion pipe, serves for discharging the gas stream (possibly with ultra-fine particles) upward. With the selection of the diameter and of the length of the immersion pipe, it is sought, for a given cyclone, to achieve suitable flow conditions and thus optimum functionality. Aside from considerable mechanically dynamic loading owing to the gas or gas-solids particles stream which flows at high speed, and in part in turbulent fashion, owing to the resulting forces and vibration effects, and owing to the impacting of solid particles, chemical and in particular also thermal loading of immersion pipes can arise. For example, cyclone separators are used in multi-stage heat exchanger systems in plants for the production of cement clinker from cement raw meal. As exhaust gases of a rotary furnace or of a calcination stage, the gases which, in this case, flow in a combined codirectional/counterdirectional stream configuration with respect to the raw meal (and which serve for preheating the raw meal) have high temperatures. In the lowermost cyclone in particular, typical temperatures of approximately 700° to 950°C, and briefly even higher temperatures, are encountered here, such that here, the immersion pipe is subject to particularly high thermal load and thus to intense thermochemical and abrasive wear. With regard to the composition of immersion pipes, the challenge thus exists to counteract problems that arise under such extreme conditions.

One improvement in relation to immersion pipes manufactured from one pipe piece is represented by the immersion pipe disclosed in document DE 32 28 902 C2, the cylindrical wall of which is assembled from multiple longitudinal segments which are detachably fastened, separately from one another, to the cyclone separator ceiling and which, in order to support and maintain the ring shape of the immersion pipe, are surrounded, at the lower end, with a ring. The occurrence of deformations and casing fractures in the event of fluctuating thermal loads can be at least reduced by means of the longitudinal segmented design, and the assembly work can be simplified.

The document EP 0 962 255 Bl discloses a suspension arrangement in the case of immersion pipes with segmented assembled walls, in the case of which the problems with regard to robustness and strength of the suspension that arise as a result of extreme thermal load are reduced through the provision of cooling of the suspension bolts as a result of the arrangement thereof in spacer bushings which are cooled using ambient air. Here, demands with regard to assembly and maintenance arise from the fact that this involves a relatively complex construction. EP 1 153 662 Bl and EP 0 447 802 propose installation elements for the assembly of a segmented immersion pipe which is subject to heat and wear loading. Said installation elements are arranged on metallic grates and have heat-resistant ceramic material. Aside from the high economic outlay for the production of said immersion pipe, the problem may arise that the flexibility of the metal grate leads, during operation, to damage to the introduced, in part brittle, ceramic compound.

In the course of development, it is increasingly the case that, in order to improve the mechanical robustness of the immersion pipe and in order to simplify assembly and maintenance, the immersion pipe walls are assembled from relatively small segments which are arranged in rows and which are hooked into one another following the direction of gravitational force and which are ultimately suspended on the upper immersion pipe margin, as proposed for example in US 7,841,477 B2. Said document however not only proposes possible repair work by means of a ring-shaped device, which is not assembled from individual components but rather is of unipartite form, for the suspension of the segments on the cyclone ceiling (or ultimately on the gas line that leads away) . Furthermore, the teaching also does not present any construction methods for an adequately strong connection of the segments to one another which, with regard to sealing action and dimensional stability of the immersion pipe, also withstands high dynamic loads.

Detailed proposals for such segment connections are presented in DE 42 36 895 Al. Said document proposes an immersion pipe for a centrifugal separator, which immersion pipe is composed of a multiplicity of rings which are arranged one above the other and which are connected to one another and which, in turn, are made up of a multiplicity of plate-like segments. The connection of the segments, which are suspended under the action of gravitational force, to the segments of the row situated thereabove is made possible by means of at least partially obliquely configured abutment surfaces, such that a modular, construction-kit-like connecting system is realized in the case of which the stability of the immersion pipe is realized by means of self-locking, effected by the oblique surfaces, of the individual elements. In one refinement, the oblique surfaces are formed on extensions and recesses in the manner of bone ends, giving rise to jigsaw-like assembly of the segments, realized as cast parts. No more detailed information is given regarding suspension components on the upper edge of the immersion pipe and regarding the provision of a termination, which imparts dimensional stability, at the lower margin. Even though a certain level of stability of the immersion pipe is realized with the proposal, the principle of the abutment surfaces designed as oblique surfaces and which are possibly formed on recesses/extensions is however subject to limits under extreme dynamic conditions. For example, vibrations, shocks and shear forces resulting from density fluctuations act on the wall or on the individual segments such that forces arise which act not only inwardly or outwardly but also with significant components in the plane of the adjacent segments. The extensions with oblique surfaces are in this case scarcely suitable for maintaining the connection counter to the forces, such that the dimensional stability of the immersion pipe decreases. It is however at least the case that, during the course of operation, wear of the oblique surfaces occurs, along with the risk of breakages in extensions of bone-like shape, for example, such that there is the risk of expensive maintenance being necessary. A further example of an immersion pipe for conducting a gas stream out of a cyclone separator, having a cylindrical wall assembled from individual segments of identical form, said segments being arranged in at least two rows which are arranged one underneath the other and which extend in each case in ring-shaped fashion around the circumference of the immersion pipe, is also known from US 2012/204526 Al.

It is therefore an object of the invention to specify an immersion pipe for conducting a gas stream out of a cyclone separator, in the case of which, even in the event of intense mechanically dynamic and thermal loads, a high level of rigidity of the wall, including a robust connection between individual wall components, and dimensional stability are realized, and in the case of which assembly and maintenance work can be performed quickly and easily and thus in an economically favorable manner.

The object according to the invention is achieved by means of an immersion pipe for conducting a gas stream out of a cyclone separator having the features of Claim 1. Further advantageous refinements are specified in the subclaims that refer back to Claim 1.

According to the invention, it is provided that adjacent segments of a row adjoin one another in a flush manner, and the segments of two adjacent rows are arranged offset with respect to one another, and that each segment has a plate-like main body, wherein the plate-like main body (in an upright position) has, in its horizontal extent, a curvature corresponding to the cylindrical shape of the wall, and has, in the vertical section performed in a radial direction, an approximately S-shaped form which is flattened at the ends, such that an overlap of the lower main body section of a segment of one row with the upper sections of the adjoining segments of the row situated therebelow is possible; it is furthermore provided that each segment has, in its lower section, two horizontal recesses which run at the same height, which are arranged symmetrically with respect to one another, which are of slot-like form and which are open toward the respective margin of the main body, and that each segment has, in the central region of the upper margin of the main body, on the inner side situated toward the interior region of the immersion pipe, a plate section which projects approximately at right angles with respect to the main body, wherein the plate section has, in the region of its edge situated toward the interior region of the immersion pipe, in the outer sections of said edge, in each case one substantially cuboidal, flat projection element which leads upward approximately at right angles, in such a way that the projecting plate section of each segment of one row can, in order to produce a segment connection, be fitted in each case over half of its extent into in each case one recess of the two respectively adjoining segments of the row situated thereabove, and that, in the case of such a segment connection, the projection elements of the lower segment engage areally, and with a spacing to the open margin of the respective recess, on the inner side behind the main bodies of the respective segments of the row situated thereabove; it is furthermore provided that each segment has, on the inner side, above each of the two recesses, in the marginal region of the main body, in each case at least one perpendicularly inwardly protruding, approximately cuboidal extension element, such that, when a segment connection exists, the extension element, by means of a blocking action on the respective projection element, prevents the projecting plate section of an adjoining segment situated in the row therebelow from laterally sliding out of the recess.

The assembly of the wall from segments, as well as the construction of the suspension arrangement and of the lower termination of the immersion pipe from individual components, simplifies the installation and exchange of individual segments or components. In particular, rapid and thus economically relatively expedient exchange of segments of the wall in the event of maintenance and repair measures is possible owing to the plugged-together, suspended connection of the segments to one another; in particular, no welding work is necessary. By means of a multiplicity of segments of small size, it is possible for an exchange of material to be limited to the regions actually affected. Also, a lengthening or shortening of the immersion pipe can be performed in a relatively short time, which may be advantageous in the event of changed operating conditions of the cyclone.

It is also the case in the immersion pipe proposed according to the invention that, in a manner already known, the segmented design enhances the robustness with respect to thermal and in this case in particular deforming actions, and basically also with respect to mechanically dynamic actions. As has been found, it is the case here that in particular the described structural nature of the connection between the segments - and the presence of a terminating lower edge - give rise to considerable dimensional stability and rigidity of the immersion pipe suitable, for example, for the conditions of a cyclone (in the lower stages) of a heat exchanger system in the context of the production of cement clinker from raw meal.

In particular, high dynamic robustness of the segment connection is ensured by virtue of the suspension/plug-type connection between segments of adjacent rows being consolidated and fortified twofold: after the fitting of the plate sections into the recesses of the adjoining segments, the connection produced as a result of the fitting-in of the plate sections is secured by the projection elements, by way of angled, areal abutment against the segment situated thereabove, additionally and more stably in relation to, for example, contact along an oblique surface. Furthermore, in a tangential direction of the immersion pipe wall, the extension elements above the recesses prevent one segment from sliding laterally out of the other owing, for example, to additional shear forces, because the extension elements block the projection elements of the surface section fitted into the respective recess so as to prevent them from performing such a movement. Furthermore, the overlap, which is made possible by means of the S shape of the plate-like segment main bodies, of the connected segment rows contributes to the dimensional stability and to the sealing action of the immersion pipe.

In an advantageous embodiment of the invention, it is provided that the at least two extension elements on the inner side of each segment are arranged at the respective margin such that areal contact, for the dimensional stabilization of the immersion pipe, is realized between the corresponding extension elements of two segments which are adjacent in one row. Here, the extension elements according to the invention perform not only the function of preventing a lateral detachment, and thus resulting formation of leakage points in the immersion pipe wall, between adjacent segments of one row owing to the intense dynamic loading of the immersion pipe during operation. As has been found, it is also the case in this embodiment that the extension elements contribute considerably to maintaining the cylindrically symmetrical shape of the immersion pipe which is advantageous from an energy aspect and which is important for minimizing the wear of the immersion pipe, because local disturbances are, owing to the contact of the extension elements, dissipated over the entire circumference.

In the case of immersion pipes in cyclone separators that are used in heat exchanger installations, for example in cement production, the immersion pipe is subjected to particularly intense load by the temperature of the gas stream and of the ultra-fine particles still suspended therein. Demands placed on the material of the segments thus relate in particular to heat resistance, resistance to high-temperature corrosion, ductility and strength. A particularly advantageous embodiment of the invention therefore provides that the segments are manufactured from heat-resistant cast steel. Here, it is expedient for the segments to be manufactured as in each case only one cast part, though multi-component casting or other suitable methods are also possible. In the case of cyclones in which the gas-solids stream has lower temperatures than in the upper stages of a multi-stage cyclone heat exchanger, it is also possible for heat-resistant sheet steel to be used for the segments, but here, it must be incorporated into the calculation that the manufacture by means of processes such as bending and welding is expensive.

In a further particularly advantageous embodiment of the invention, it is provided that the segments are of ergonomic design, that is to say in particular designed such that they can be carried and easily handled. The size of each segment is dimensioned such that the weight of the segment does not exceed 60 kg, preferably 25 kg, even more preferably 10 kg. The advantages of the segmented design include the fact that it simultaneously makes it possible, during installation and repair of the immersion pipe, for in each case only individual segments to be moved and exchanged. Here, the installation and repair times are shortened, and the service life is lengthened, if the segments are in this case easy to handle and, in the best case, can be lifted by only a single technician. The segments can thus be kept correspondingly small without the immersion pipe losing functionality and stability.

In a further embodiment of the invention, it is provided that a first fraction of the termination components at the lower end of the immersion pipe are formed by termination segments arranged in ring-shaped fashion around the circumference at the lower end of the immersion pipe, and a second fraction of the termination components are formed by stabilizing elements which connect the termination segments to one another; here, each termination segment (in an upright position) is, in its upper section, of the same design as the corresponding upper section of a segment of the wall of the immersion pipe, such that the termination segment engages by means of a projecting plate section and two projection elements into the recesses of in each case two adjoining segments arranged in the lowermost segment row of the wall in order to produce a connection; here, it is furthermore the case that the lower part of each termination segment is composed of a plate-like main body which, toward the inner side, by means of a doubly angled configuration, has an upwardly open U-shaped profile, wherein the two upwardly pointing flanges of the U-shaped profile are additionally connected to one another by means of at least two webs; furthermore, it is the case here that the stabilizing elements have an elongate form with recesses at the underside, such that, along the entire circumference of the immersion pipe, in each case multiple, preferably in each case two, adjacent termination segments are rigidly connected to one another by virtue of a stabilizing element being inserted into the continuous U-shaped profile of said termination segments, wherein the recesses of each stabilizing element engage around webs of multiple termination segments, preferably in each case one web of two adjacent termination segments, from above.

Thus, while the termination segments are plugged into the lowermost row of the wall segments in the same way as the wall segments of adjacent rows are connected to one another, the U-shaped profile on the lower end of the termination segments permits the introduction of longitudinal bodies which are preferably likewise manufactured from heat-resistant steel. By means of webs of U-shaped profile and recesses, which match said webs, on the underside of said stabilizing elements, it is possible for said recesses to be plugged onto the webs and, there, to impart a clamping action which, in the event of slight temperature-induced expansion, is intensified further. For installation and temperature work, it is advantageous if in each case always only two adjacent termination segments are connected to one another by means of in each case one stabilizing body, with a ring-shaped arrangement being realized in this way. As has been found, the terminating lower edge that is thus realized, where the greatest mechanical loads are exerted on the immersion pipe owing to the dynamic action of the gas stream, makes a crucial contribution to the connection rigidity and dimensional stability of the immersion pipe. Here, the installation times are relatively short.

With regard to the fastening of the immersion pipe at its upper end, a particularly advantageous refinement of the invention provides that each suspension component is composed of a suspension segment and of a suspension body, wherein; here, each suspension segment is arranged offset with respect to the segments of the uppermost row of the wall of the immersion pipe and (in an upright position) is, in its lower section, of the same design as the corresponding lower section of a segment of the wall, such that the projecting plate sections of the in each case two adjoining segments of the uppermost row engage into the recesses of the suspension segment and, at the projection elements, are prevented by the extension elements of the suspension segment from sliding out laterally; here, it is furthermore the case that the upper part of each suspension segment is composed of a plate-like main body which, toward the outer side, by means of a doubly angled configuration, has a downwardly open U-shaped profile which forms a hook; furthermore, each suspension body is arranged, so as to adjoin the upper margin of the immersion pipe, on a ceiling of the cyclone separator, and is of such a form that the corresponding suspension segment can be suspended with its hook on an approximately cuboidal section of the suspension body, and that a section, which is set back in a downward direction in stepped or continuous fashion, of the suspension body leads outwardly from the cuboidal section as far as a fixed structural element of the cyclone separator, preferably the wall of a gas take-off line which conducts the gas stream away upward, and that the suspension body is screwed to the fixed structural element of the cyclone separator, preferably the wall of the gas take-off line.

In the case of the suspension thus realized, the suspension bodies may each be manufactured from a single cast part. The suspension bodies may be arranged on the cyclone ceiling, possibly on a planar flange or support device attached to the gas line. In general, in the case of cyclone separators, gas rising lines conduct the gas stream away upward after it exits the immersion pipe, wherein the gas lines are fastened by means of their wall to the cyclone ceiling. Said gas line walls or casings may - even in the case of existing cyclones being retrofitted with the immersion pipe type proposed here -be used for the purposes of detachably bolting the suspension bodies to the gas line by means of at least one countersunk bolt, and thus imparting additional stability to the suspension arrangement. Both such installation of the suspension bodies and the hooking-in of the suspension segments are distinguished by particular simplicity, wherein the number of parts required is also relatively low. Welding work is not required.

To ensure a high level of resistance to corrosion and heat resistance, it is provided in one embodiment of the invention that the suspension bodies are manufactured from a fireproof material with high compressive strength. Then, as has been found, no cooling of the suspension arrangement is required owing to the construction, such that the problems of cooled suspension arrangements that are known from practice do not arise in the case of the suspension construction proposed according to the invention.

The immersion pipe according to the invention is not imperatively restricted to the specific form described here. The segmented design makes it possible, through corresponding variation of the S shape of the segments and by means of a trapezoidal rather than the normally more rectangular form of the plate-like segment main bodies, to realize even conical immersion pipe sections rather than purely cylindrical immersion pipes. Furthermore, individual parts may vary in terms of their specific form without departing from the basic principle according to the invention of the plug-type connections and the termination and suspension construction.

The invention will be discussed in more detail on the basis of the following figures, in which: figure 1 shows an immersion pipe according to the invention in a side view; figure 2 shows a view of the immersion pipe from figure 1 from above; figure 3 shows a vertical section through the immersion pipe at a circumferential location; figure 4.1 shows a suspension segment (top view); figure 4.2 shows a suspension segment (view of the outer side); figure 4.3 shows a suspension segment (side view); figure 5.1 shows a segment of the wall (top view); figure 5.2 shows a segment of the wall (view of the outer side); figure 5.3 shows a segment of the wall (side view); figure 6.1 shows a termination segment (top view); figure 6.2 shows a termination segment (view of the outer side); figure 6.3 shows a termination segment (side view); figure 7.1 shows a stabilizing element (top view); figure 7.2 shows a stabilizing element (longitudinal side view); figure 7.3 shows a stabilizing element (transverse side view); figure 8 shows a suspension body (isometric view).

Figure 1 shows an exemplary embodiment of the immersion pipe 1 according to the invention in a side view. The cylindrical wall 2 of the immersion pipe 1 is composed of interconnected, ring-shaped rows, which in turn are assembled from segments 3 which are of identical form and which are preferably manufactured from heat-resistant cast steel. At the upper margin, the immersion pipe 1 opens into an upwardly leading gas take-off line 4 (schematically illustrated to a certain extent), wherein suspension bodies 5 are bolted to the wall of the gas take-off line 4. Said suspension bodies 5 are arranged in ring-shaped fashion over the entire circumference, wherein, in figure 1, only the two suspension bodies 5 on the left and on the right are shown at the upper margin. The suspension bodies 5 are in this case mounted on a web which is welded to the gas take-off line 4 or on the cyclone separator ceiling 6. To the uppermost row of the segments 3 of the wall 2 there are connected suspension segments 7, wherein each suspension segment 7 is suspended on a suspension body 5, whereby suspension of the entire immersion pipe 1 is realized. The lower margin of the immersion pipe 1 is stabilized by means of a row of termination segments 8, into the U-shaped profile, formed at the lower end, of which there are inserted stabilizing elements 9 in the form of longitudinal bodies (not visible in the figure) . The immersion pipe 1 conducts the gas stream entering from below, from which the solids particles have been separated off possibly with the exception of ultrafine particles, upward out of the cyclone. The immersion pipe 1 from figure 1 is illustrated in a top view in figure 2.

Figure 3 schematically illustrates, in a vertical section at a location of the circumference of the immersion pipe 1, the suspension sequence of the constituent parts of the immersion pipe 1. At the upper margin, the suspension segment 7 is suspended on the suspension body 5, wherein the suspension body 5 on a web welded to the gas take-off line 4 or on the cyclone separator ceiling 6 is detachably fastened by means of a bolt 10 to the wall of the gas take-off line 4. The suspension segment 7 is suspended, by means of the profile of a hook 11 formed on its upper end, on the cuboidal section 12 of the suspension body 5, wherein the cuboidal section 12 transitions into a downwardly set-back section 13 of the suspension body 5. In other exemplary embodiments, the cuboidal section 12 may also be designed in other forms. In the exemplary embodiment, in a hanging connection configuration, the suspension segment 7 is joined by six segments 3 of the wall 2. Said segments 3 overlap owing to their flattened, approximately S-shaped profile and are hooked into one another, wherein the adjoining segments 3 of mutually adjacent rows are offset with respect to one another (cf. figure 1) . The lower termination is formed by a termination segment 8, into the U-shaped profile 14 of which, situated at the lower end thereof, there is fitted a piece of a stabilizing element 9.

Figures 4.1 to 4.3 illustrate a suspension segment 7 in a view from above (4.1), in a view of its outer side averted from the interior of the immersion pipe 1 (4.2) and in a side view (4.3) . The view from above shows the domed shape that the suspension segment 7 has correspondingly to the cylindrical shape of the immersion pipe 1. The suspension segment 7 has a plate-like main body 15, on the upper end of which, by means of a doubly angled configuration, a U-shaped profile is formed which serves as hook 11 for the suspension arrangement. In its lower region, the suspension segment 7 has, for the connection to the segments 3 of the uppermost row, two slot-shaped, horizontal recesses 16 which are open toward the margin. The extension elements 17 provided on the inner side are part of the construction according to the invention, which prevents a hooked-in segment 3 from sliding out of the respective recess 16.

Figures 5.1 to 5.3 illustrate a segment 3 of the wall 2 in a view from above (5.1), in a view of its outer side averted from the interior of the immersion pipe 1 (5.2) and in a side view (5.3) . In the plan view, it is possible to see the domed shape in the horizontal direction, and in the side view, it is possible to see the flattened, approximately S-shaped form of the plate-like main body 15 of the segment 3. In the lower region, the design of the segment 3 corresponds to the design of the lower region of a suspension segment 7, as already discussed. In the center of the upper marginal region, the segment 3 has a plate section 18 which projects at right angles toward the inner side. At its two corners situated toward the inner side, the plate section 18 has in each case one flat projection element 19 which leads upward at right angles. The dimensions of the segments 3 are selected such that a segment 3 can be fitted with in each case half of its plate section 18 into the mutually adjoining recesses 16 of the adjoining segments 3 situated in the row thereabove (or termination segments 8). Here, in order to increase the connection stability, the projection elements 19 engage with areal contact on the inner side behind the main body 15 of the respective segment 3 situated thereabove (or termination segment 8). In the connection, the projection elements are, in an inward direction, positioned directly adjacent to the respective extension elements 17, such that a sliding movement laterally out of the recesses 16 is blocked even under the action of high forces. Additional support is realized as a result of contact between corresponding extension elements 17 of two adjacent segments 3 in one row. In this way, the segments 3 are connected to one another with high connection rigidity such that the immersion pipe is provided with high dimensional stability.

Figures 6.1 to 6.3 illustrate a termination segment 8 in a view from above (6.1), in a view of its outer side averted from the interior of the immersion pipe 1 (6.2) and in a side view (6.3) . The design of the upper part of the termination segment 8 corresponds to the design of the upper part of a segment 3 of the wall 2, such that the termination segment 8 can be hooked into the lowermost row of the segments 3. In the lower region, each termination segment 8 has, toward the inner side, an upwardly open U-shaped profile 14. The two limbs (flanges) of the U-shaped profile 14 are in this case connected to one another by two webs 20.

For dimensional stability of the immersion pipe 1, the coherent U-shaped profile 14 which is formed by the termination segments 8 and which extends in ring-shaped fashion around the circumference has fitting, longitudinally extending stabilizing elements 9 inserted therein. A stabilizing element 9 of said type is illustrated in figures 7.1 (view from above), 7.2 (view of the longitudinal side) and 7.3 (view of the transverse side) . In the situation which is preferred inter alia for installation reasons, and which is shown here, a stabilizing element 9 is provided for in each case two adjacent termination segments 8. On its underside, stabilizing element recesses 21 are provided such that each recess 21 can engage around in each case one web 20 of the two adjacent termination segments 21 from above, and thus, by means of the clamping or wedging action thus realized, produces a rigidly connected and dimensionally stable lower termination of the immersion pipe 1.

Figure 8 shows a suspension body 5 in an oblique view. As described above, said suspension body has an approximately cuboidal section 12. In order that the hook 11 of the corresponding suspension segment 7 can be hooked onto said cuboidal section 12, the further part of the suspension body 5 is formed by a section 13 which is set back in a downward direction in stepped or, as illustrated and as preferred for statics reasons, continuous fashion. Said section leads the suspension body 5 to a fixed structural element, in particular the wall of the gas take-off line 4, to which the suspension body 5 can be detachably bolted by means of at least one countersunk bolt 10. The suspension bodies 5 are preferably manufactured from fireproof material with high compressive strength, such that special cooling measures can be dispensed with.

By means of the construction of the immersion pipe 1 illustrated in the exemplary embodiment and made up of a combination of three parts - composed of firstly the discussed segments 3 of the wall 2 with their connecting devices according to the invention, secondly the suspension components 5, 7 according to the invention and thirdly the termination components 8, 9 - an immersion pipe 1 is specified which (when the stated materials are used) is suitable even for the extreme thermal and mechanically dynamic loads prevailing for example in cyclone separators used in the cement industry, and which, in the process, permits economically favorable operation .

LIST OF REFERENCE DESIGNATIONS 1 Immersion pipe 2 Wall 3 Segment (wall) 4 Gas take-off line 5 Suspension body 6 Cyclone separator ceiling 7 Suspension segment 8 Termination segment 9 Stabilizing element 10 Bolt 11 Hook 12 Cuboidal section 13 Set-back section 14 U-shaped profile (termination segment) 15 Main body 16 Recess 17 Extension element 18 Plate section 19 Projection element 2 0 Web 21 Stabilizing element recess

Claims

A diving tube (1) for discharging a gas stream from a cyclone separator, comprising - a cylindrical wall (2) composed of individual segments (3) of the same shape, wherein the segments (3) are located in at least two rows which each of which extends in an annular shape about the periphery of the diving tube (1), - a suspension device located at the upper end of the diving tube (1) is formed by suspension components (5, 7) and extends in an annular shape around the periphery of the diving tube (1). the diving tube (1), for suspending the diving tube (1) and - an annular lower edge located at the lower end of the diving tube (1) and formed by termination components (8, 9), for increasing the shape strength of the diving tube (1), where - adjacent segments (3) are arranged in a series adjacent to each other in level with each other, and the segments (3) from two adjacent rows are positioned offset relative to each other, - each segment (3 ) is provided with a plate-like base body (1 5), in which the plate-like base body (15) (at a vertical position) - has a curvature which is in a horizontal direction corresponding to the cylindrical shape of the wall (2), and - in a vertical section made in a radial direction, approximately an S-shape flattening at the ends in such a way that the lower base body portion of a segment (3) can be overlapped in a row with the upper sections of the adjacent segments (3) from the underlying row, - each segment (3) in its lower section is provided with two horizontal, slot-shaped recesses (16) extending at the same height, are symmetrical with respect to each other and open towards the respective edge of the base body (15) - each segment (3) in the middle region of the upper edge of the base body (15) on the inside facing the inner region of the dive tube (1) is provided with a plate section (18) protruding in an approx. right angle to the base body (15), where plate cut the web (18) in the region at its edge facing the inner region of the diving tube (1), in its outer section, is provided in each case with a substantially box-shaped flat projection element (19) which is projected upwards in a at about a right angle, in such a way that - the protruding plate portion (18) of each segment (3) of a row for making a segment connection in each case for half may be inserted in each case a recess (16) on the two adjacent adjacent segments (3) of the above row, and - in such segment connection, the projection elements (19) on the lower segment (3) are flat and at a distance from the open edge of said recess (16) on the inside. engages the base body (15) of the respective segments (3) in the upper row, and that - each segment (3) on the inside, above each of the two recesses (16), in the peripheral region of the base body ( 15) each is provided with at least one approximately box-shaped impact member (17) projecting perpendicularly inwards, in such a way that the impact element (17), by an existing segment connection, through a blocking effect on said projection element (19) prevents the projecting plate portion (18) of an adjacent segment (3) located in the row below from sliding out of the recess (16) to the side.

Dive tube (1) according to claim 1, characterized in that the at least two abutment elements (17) on the inside of each segment (3) are positioned in such a way on the rim in question that between the corresponding abutment elements ( 17) of two segments (3) lying next to each other in a row, a flat contact is formed for the shape stabilization of the diving tube (1).

Dive tube (1) according to one of claims 1 or 2, characterized in that the segments (3) are made of steel castings.

Dive tube (1) according to one of claims 1 to 3, characterized in that the size of each segment (3) is dimensioned such that the weight of the segment (3) does not exceed 60 kg, preferably 25 kg, yet more preferably 10 kg, so that the segment (3) is ergonomically designed.

Dive tube (1) according to one of Claims 1 to 4, characterized in that the closing components (8, 9) are formed, for the first part, by closing components (8) located at the lower end of the diving tube (1). annular form around the periphery, and for the second part is formed by stabilizing elements (9) connecting the terminating segments (8) to each other, where - each terminating segment (8) (in vertical position) in its upper section is designed in the same way as the corresponding upper section of a segment (3) of the diving tube wall (1) in such a way that the closing segment (8) with a protruding plate section (18) and two projection elements (19) engages in the projections (16) in in each case two adjacent segments (3) located in the lower segment row of the wall (2) for making a connection, the lower part of each terminating segment (8) consisting of a plate-like base body (15) whicha double-angled U-profile (14) is open towards the inside, with the two flanges of the cup profile (14) pointing upwards additionally connected to each other by means of at least two connecting pieces (20), and the stabilizing elements (9) have an elongated shape with recesses (21) on the underside in such a way that, in each case, along the entire periphery of the diving tube (1), several, preferably in each case two, are connected; adjacent end segments (8) in a rigid connection with each other by inserting a stabilizing element (9) into the continuous U-profile (14) of these end segments (8), the recesses (21) of each stabilizing element (9). ) from above engages connecting pieces (20) on several terminating segments (8), preferably in each case a connecting piece (20) from two adjacent terminating segments (8).

Submerged pipe (1) according to one of claims 1 to 5, characterized in that each suspension component (5, 7) consists of a suspension segment (7) and a suspension body (5), wherein - each suspension segment (7) is located offset relative to the segments (3) in the upper row of the diving tube (I) wall and (in the vertical position) in its lower section is formed in the same way as the corresponding lower section of a segment (3) of the wall (2) of such that the protruding plate sections (18) of the upper two adjacent segments (3) in the upper case in each case engage the recesses (16) of the suspension segment (7) and prevent the sliding members (19) from sliding out to the side by means of the abutment elements (17) of the suspension segment (7), the upper part of each suspension segment (7) consists of a plate-like base body (15) which is provided with a double angle to the outside by a double angle. profile that then is a hook (11) and is open downward, and each suspension body (5) is positioned on a connector located by a gas extractor line (4) which directs the gas flow away in an upward direction, adjacent to the upper edge of the diving tube ( 1), and of such a shape that the corresponding suspension segment (7) can be suspended with its hook (II) on a section (12) of the suspension body (5) which is suitably shaped and in particular is approximately box-shaped, section (13) of the suspension body (5), which steps in step or continuously projects downwardly, from the section (12) which is suitably shaped and in particular approximately box-shaped, extends outwardly until a fixed structural element of the cyclone separator, preferably the wall of the gas extraction line (4) and the suspension body (5) are screwed together with the fixed structural element of the cyclone separator, preferably the wall of the gas extraction line (4).

Dive tube (1) according to claim 6, characterized in that the suspension bodies (5) are made of a refractory material with high compressive strength.