EP0934498A1

EP0934498A1 - Shaft cooler

Info

Publication number: EP0934498A1
Application number: EP97945858A
Authority: EP
Inventors: Helge Fuldner
Original assignee: Babcock BSH AG
Current assignee: Grenzebach BSH GmbH
Priority date: 1996-10-23
Filing date: 1997-10-18
Publication date: 1999-08-11
Anticipated expiration: 2017-10-18
Also published as: WO1998017959A1; EP0934498B1

Abstract

The invention concerns a shaft cooler which, instead of side walls, comprises in its cooling unit (2) metal side panels (32) which extend on the laterally outer pipes (22) between the walls.

Description

Shaft cooler

The invention relates to a shaft cooler according to the preamble of claim 1, which is used for cooling granular or free-flowing bulk material. In such shaft coolers, which are also called backflow coolers or contact block coolers, the bulk material is cooled by slowly sliding past cooling surfaces arranged inside the shaft cooler. These shaft coolers have a feed unit, a cooling unit and an extraction unit arranged one above the other. Pipes, for example, serve as cooling surfaces, which extend inside the cooling unit between two opposite walls and through which a coolant, such as air or water, is passed.

Shaft coolers commonly used have smooth side walls. To increase the cooling surfaces, the tubes can be connected to one another by sheets or can be designed as finned tubes.

One problem with this shaft cooler is that the smooth side walls can impair the flow of the bulk material. There is a risk of the bulk material draining away from the side walls at the edges of the cooling unit.

When the bulk material is cooled from a higher temperature, there is also the risk of blockages in the cooling unit. Blockages can occur if coarse material gets into the cooling unit. The risk is particularly great at high temperatures, since a fine screening of the coarse material can hardly be carried out. Blockages can also occur due to thermal effects on the side walls and the sheets connecting the pipes, which lead to distortion of the side walls and the sheets. Warps and dents can be observed on the side walls. This leads to narrowing and widening of the cross section of the flow channels through which the bulk material slides along the cooling surfaces, and thus to obstruction or an impermissible acceleration of the outflow of the bulk material. In particular, the thermal effects lead to blockages in the cooling unit, which can only be removed after the cooling unit has been emptied and partially dismantled can. An expensive remedy for warping the side walls is to brick them up or to have double walls with their own cooling.

A shaft cooler is known from DE 28 09 927 A1, in the interior of which a number of cooling channels are arranged, spaced apart from one another and carrying a cooling medium. The generally approximately vertically oriented cooling channels are so zigzag or angularly profiled that the material pass zones present between adjacent cooling channels have an axis that deviates several times from the straight, vertical profile. The cooling ducts to be arranged on a duct wall can be simplified in such a way that the duct wall is simultaneously used as the wall of the cooling duct. This improves the drain in front of the side wall, cools the shaft wall and reduces the risk of warping. The removal of blockages is, however, made more difficult by the limited accessibility of the material flow zones between the profiled cooling channels. The production of profiled cooling channels as well as shaft walls provided with profiled cooling channels is very complex.

A generic shaft cooler is known from DE 20 10 601 B2. In the cooler shafts, of which several can be arranged one behind the other, there are offset transverse channels with an approximately diamond-shaped cross-section, the longer cross-sectional axis being vertical. The channels are arranged in such a way that the flow path formed between them has an approximately constant cross section for the material to be cooled. The channels are fastened at the ends in the side walls of the shafts and there are connected to feed, connection or discharge channels. A cooling of the walls of the cooling shafts running parallel to the channels is not provided and the arrangement of several cooling shafts in a row makes it difficult. When bulk goods cool down from high temperatures, these walls can warp and lead to blockages in the cooling shafts and thus to long downtimes.

The object of the invention is to develop a shaft cooler according to the preamble of claim 1, which is suitable for bulk material, for example sand, cool evenly, even from high temperatures, the downtime of which is significantly reduced due to constipation and which can be produced inexpensively.

The object is achieved by the characterizing features of claim 1.

Instead of the side walls running parallel to the tubes, the cooling unit of the shaft cooler according to the invention has side bleaches which are attached to the laterally outer tubes on the upper curves or edges of the tubes or on the outer lateral surfaces, curves or edges and extend over the entire length of the tubes extend between the front and rear walls. The side plates are attached to the tubes in such a way that they extend the alignment lines which run obliquely to the vertical along the tubes or run parallel to them. The height of the side panels, i.e. H. their extension parallel to the alignment lines is 1.2 to 5 times, in particular 1.5 to 4 times the distance between two rows of pipes along the alignment lines. This distance is designated “b” below and corresponds to the distance b of the parallel alignment lines mentioned in the description. The distance b is shown in FIGS. 4 and 7.

For a bulk material whose angle of repose is greater than or equal to the angle of the escape lines to the horizontal, a height of the side plates is sufficient, which corresponds to the distance b of two rows of pipes along the escape lines plus a security amount.

For bulk goods, the angle of repose of which is smaller than the angle of the escape lines to the horizontal, side plates with greater heights are required. If the side plates are arranged on an upper edge or the side tubes are rounded, increasing heights are used as the angle of repose falls. At an angle of repose of 0 ° there is a height twice the distance b plus the safety amount. If the side plates are arranged on an outer lateral surface, curve or edge of the laterally outer tubes, their height is additionally increased by an amount which increases with a falling angle of repose. For an angle of repose of 0 °, the height increases by the distance between the upper and the lateral arrangement of the Side plates, which is called distance I below and is shown in FIG. 7.

A few millimeters can suffice as an additional security amount for the height of the side panels. Occurring in operation, however, unintentional or, for. B. when emptying, intended vibrations, side panels are used with a height up to the amount that corresponds to an angle of repose of 0 °, plus the security amount of a few millimeters.

In most versions of the shaft cooler, the pipes are arranged so that the distance b between two rows of pipes along the alignment lines is the same in both directions. In the case of an arrangement of the pipes with a different distance in different directions, the average distance and an increased safety amount or the distance of the rows of pipes upstream in the bulk material flow is taken as a measure for determining the height.

The side plates of a shaft cooler according to the invention replace the side walls by preventing the bulk material flowing between the tubes from escaping laterally from the cooling unit. At the side edges, the bulk material leaves the gap between the two outer tubes of a first and a second row, which are arranged offset from one another, meets the side plates attached to the top or side of the outer tubes of a third row and forms an angle of repose towards the side plates. The angle of repose depends on the type and movement of the bulk material. As described above, the height of the side plates is chosen such that the deepest, outer point of the angle of repose is always below the upper, free edge of the side plates. This prevents leakage from the cooling unit. After the build-up of an angle of repose, the bulk material enters the gap between the outer tubes of the second and third rows, which are also offset from one another. After the angle of repose has been built up, the bulk material also flows out evenly on the outer tubes of the cooling unit, since the cross-sections of the flow channels at the edges correspond to those in the interior of the cooling unit. The use of side plates instead of side walls leads to a simple construction of the shaft cooler according to the invention, which is much cheaper to manufacture than a shaft cooler with bricked, double-walled or with profiled channels side walls.

A shaft cooler according to the invention is particularly suitable for cooling bulk goods from high temperatures. Bulk goods, such as sand, can be cooled to 20 to 50 ° C. at temperatures from 100 to 850 ° C., in particular from 400 to 850 ° C. This is made possible by the arrangement of side plates instead of side walls, which avoids thermal expansion problems between the tubes and side plates. The exposure to hot bulk goods is less with the side panels than with smooth side walls. The, e.g. B. by welding spots or welds, side plates closely connected to the outer tubes, like fins, are cooled well via the tubes.

In the case of particularly hot bulk goods, it is advisable to attach the side walls to the side of the outer tubes. Bulk material collects in the pockets thus formed, which in particular protects the upper side panels from direct heat from the hot, still uncooled bulk material. In this case, the side plates should be attached to the outer tubes with continuous weld seams for better heat conduction.

In a shaft cooler according to the invention, temperature differences with different expansions of the side plates and the pipes are prevented from occurring at high product temperatures. The arrangement and shape of the pipes are not affected by thermal effects. The channels through which the bulk material flows past the pipes remain of the same size, so that there are no bottlenecks in the cooling unit, which can lead to blockages. Replacing the side walls with the side plates avoids a hindrance or impermissible acceleration of the discharge of the bulk material at the side edges of the cooling unit due to warpage and bulging of the side walls which occur under the influence of temperature. In addition, leaks caused by thermal expansion are avoided. Such leaks occur in the case of shaft coolers with four walls to compensate thermal transitions between the pipes and one of the walls. In the shaft cooler according to the invention, the pipes can be firmly welded into the two opposite walls. A floating bearing under one of these walls and corresponding devices in the supply and discharge lines of the shaft cooler can serve as compensation for thermal expansion.

A shaft cooler according to the invention is also suitable for cooling bulk materials at low temperatures, for example for cooling sugar from 40 to 70 ° C to 20 to 30 ° C. In the case of food or feed or chemical products where a small part of the bulk material is undesirable in the shaft cooler, it is advisable to attach the side plates to the upper curves or edges of the outer pipes without offset. This also has the advantage of simply emptying the shaft cooler.

Due to the side plates arranged in alignment or parallel to the alignment lines, the flow channels at the edges of the cooling unit are formed by the gaps between the outer tubes of rows lying one above the other, which correspond to the gaps between inner tubes. In the shaft cooler according to the invention there are therefore no flow channels at the edges, the cross sections of which differ from the corresponding cross sections in the interior of the cooling unit, and therefore no particular edge influence on the material movement. In contrast to the impairment of the flow pattern of the flowing bulk material, in particular to the risk of increased accessibility to the edges, with smooth side walls, a shaft cooler according to the invention enables a uniform flow pattern and thus uniform cooling. It is favorable in terms of flow and heat technology.

Another advantage of the shaft cooler according to the invention is that due to the side plates arranged in alignment or parallel to the alignment lines, the extensions of the flow channels remain free and thus the shaft cooler for observation and measurements but also for cleaning, for example for removing coarse material, from the Pages are accessible. An arrangement of the pipes in successive rows by half the distance between the central axes offset from each other according to claim 2 enables a tight arrangement of the pipes in a variety of cross-sectional shapes of the pipes and thus a large cooling capacity of the shaft cooler. A high cooling capacity is particularly advantageous when cooling at high temperatures.

When using pipes with a square cross-section, wherein one of the edges of the pipes is oriented vertically upwards, according to claim 3, compared to pipes with a round or rounded diamond-shaped cross-section, allows larger contact areas and thus a greater cooling capacity of the shaft cooler. Since the cooling surfaces are arranged at an angle of 45 ° to the vertical, a shaft cooler is particularly suitable for bulk goods with an angle of repose of less than 45 °. The arrangement of the pipes according to claim 3 aligned through the rows and offset according to claim 2 in successive rows by half the distance between the central axes leads to flow channels with the same cross-sections between the surfaces of the pipes.

A shaft cooler, in which the distances according to claim 4 between the horizontally or vertically opposite edges of the tubes each correspond to 50 to 80%, in particular 60 to 70% of the side length of the tubes, are particularly suitable for cooling sand and similar bulk materials from temperatures of 400 to 850 ° C suitable for temperatures from 20 to 50 ° C.

The arrangement of several tube bundles one above the other and the connection of the discharge device of a tube bundle with the feed device of a next higher tube bundle according to claim 5 enables the coolant to be guided in countercurrent to the bulk material flowing through the cooling unit.

Arranging the tubes in alignment through the tube bundle according to claim 6 enables the accessibility of the entire inner cooling unit through several tube bundles from the sides. The formation of the two opposite walls according to claim 7 as double walls, which are divided by partitions into the supply and discharge devices of the tube bundle forming chambers, enables simple training and a simple connection, namely as a common chamber, superimposed discharge and supply devices with simultaneous cooling of these walls and thus a simple countercurrent flow of coolant and bulk material.

The formation of the partitions according to claim 8 with an outer thicker section to which they are fastened and an inner thin section enables the tube bundles to be arranged close to one another and, in the case of an arrangement of the tubes according to claim 3 in conjunction with claim 2, between omit exactly one row of tubes from the tube bundles.

A bar grate according to claim 9 is particularly suitable for removing coarse material at high material temperatures. Since in the shaft cooler according to the invention a warping of the pipes or the side walls is no longer to be expected, a spacing of the grate bars that is 0.25 to 0.4 times the mean spacing of the escape lines is sufficient to minimize the risk of clogging of the cooling unit.

The invention is further explained using two examples of shaft coolers shown schematically in the drawing. The first example is shown in FIGS. 1 to 6. 1 shows a vertical cross section parallel to the width of the shaft cooler, perpendicular to the course of the pipes, and FIG. 2 shows a vertical cross section labeled AA in FIG. 1 parallel to the length of the shaft cooler and thus parallel to the course of the pipes. FIG. 3 shows an enlargement of the view W marked in FIG. 1, part of a bar grate and a baffle plate in the feed unit, FIG. 4 shows an enlargement of a detail X marked in FIG. 1, tubes with side plates on one of the side edges, in FIG. 5 an enlargement of a section Y marked in FIG. 2, part of a front wall formed as a double wall with partitions, and in FIG. 6 an enlargement of a section marked in FIG. 2 Detail Z, a pull-out floor, shown. FIG. 7 uses an illustration corresponding to FIG. 4 to show an alternative arrangement of the side plates of the second example.

A shaft cooler according to the invention has a feed unit 1, a cooling unit 2 and a withdrawal unit 3 arranged one above the other. Its shape corresponds approximately to that of an erected cuboid, whereby, as already mentioned, the vertical cross section of FIG. 1 runs parallel to the width and the vertical cross section of FIG. 2 runs parallel to the length of the shaft cooler.

The feed unit 1 is formed by a cuboid hood 4 with flattened upper longitudinal edges 5, 6. Two feed pipes 7, arranged alongside one another along the width of the shaft cooler, project into the hood 4 from above.

As can be seen in FIG. 1, starting from one of the upper longitudinal edges 5, 6 of the hood 4, here the left longitudinal edge 5, extends diagonally through the hood 4 to the lower end of one of the longitudinal walls 8, 9 of the hood 4, here the right longitudinal wall 9, a bar grate 10. The bar grate 10 can also begin and end on one of the longitudinal walls 8, 9. It runs through the hood 4 at an angle of 30 to 60 ° to the vertical, in this case at an angle of 45 °.

The rod grating 10 consists of rods 11 arranged parallel to one another, the cross sections of which have the shape of equilateral triangles. With the bar grating 10, the bars 11 are of course also arranged at an angle of 45 ° to the vertical, and in such a way that one of the side surfaces extends at an angle of 45 ° to the vertical.

A baffle plate 13 extends below the openings of the feed pipes 7 and above the bar grate 10 parallel to the long side of the shaft cooler and also at an angle of 30 to 60 ° to the vertical, here at an angle of 45 °, perpendicular to the bar grate 10.

In the right-hand longitudinal wall 9, the hood 4, directly above the lower end of the bar grate 10, extends over the entire length of the hood 4 Opening 14 for removing the coarse material retained by the bar grate 10. The opening 14 is provided with a flap 15, in front of which a cover housing 16 with a bottom opening 17 is attached to the outside of the longitudinal wall 9.

The feed unit 1 also has a level meter 18, which projects into the interior of the hood 4 in the lower region of the left longitudinal wall 8.

The cooling unit 2 has two opposite walls, the front wall 19 and the rear wall 20, and several, in this example eight, tube bundles 21 arranged one above the other.

Tubes 22 of the tube bundle 21 run horizontally between the front wall 19 and the rear wall 20. They are aligned vertically upwards with a curve or edge. The tubes 22 are arranged in several, in this example in seven, rows lying one above the other, to be precise staggered in successive rows. The tubes 22 are arranged so that they are aligned obliquely to the vertical through the rows.

The tubes 22 have a square cross section with rounded edges, one of the edges 23 of the tubes 22 being oriented vertically upwards, so that parallel alignment lines 24, 25 run along the side surfaces 26, 27 of the tubes 22 at an angle of 45 °. Tubes 22 of successive rows are offset by half the distance a between the central axes 28 of the tubes 22 of a row. The distance b between the parallel alignment lines 24, 25 is the same. The distances between the horizontally and vertically opposite edges 23 and 29, 30 and 31 are the same and amount to 50 to 80%, in particular 60 to 70%, of the side length of the tubes 22.

The cooling unit 2 has instead of side walls on the laterally outer tubes 22 on their upper edges 23 side plates 32, which extend over the entire length of the

Cooling unit 2 extend between the front wall 19 and the rear wall 20. The

Side plates 32 are each secured to the tubes 22 by two weld seams 33. Except for a slight offset due to one of the weld seams 33 the side plates 32 extend the escape lines 25, which run obliquely to the vertical, to the outside.

The height of the side plates 32 is 1.5 to 4 times, in particular 2 to 3 times, the distance b of the tubes 22 along the alignment lines 24. Here, the height of the side plates is 2.5 times the distance b of the tubes 22 along the alignment line 24, ie of the distance b between the alignment lines 24 and 25. Except for the side plates 32, the sides of the cooling unit 2 in the region of the tube bundle 21 are open.

The tubes 22 are arranged in alignment through all tube bundles 21. For this purpose, the cooling unit 2 is designed in such a way that the individual rows of the tube bundles 21 have an odd number of tubes 22, the outer tubes 22 of one row being provided with side plates 32 and the outer tubes 22 of the row above and below being offset inwards are and have no side plates 32. The tube bundles 21 have an odd number of rows, a tube bundle 21 starting at the top with a row with outer tubes 22 with side plates 32 and ending with one at the bottom. Exactly one row with inwardly offset outer tubes 22 is omitted between two tube bundles 21.

The tubes 22 of a tube bundle 21 are connected on the front wall 19 or on the rear wall 20 to a feed device and on the opposite wall to a discharge device. The discharge device of a lower tube bundle 21 is connected to the feed device of the next higher tube bundle 21, so that the coolant is guided in a zigzag shape, from bottom to top and thus in counterflow to the bulk material through the tube bundle 21.

The front wall 19 and the rear wall 20 are designed as double walls with an inner wall 34 into which the tubes 22 open and with an outer wall 35 and are divided into chambers 37, 38, 39 by partition walls 36. The lowermost chamber 37 forms one of the two walls, here the rear wall 20, the feed device of the lowermost tube bundle 21 and the uppermost chamber 39 one of the two walls, here also the rear wall 20, the discharge device of the uppermost tube bundle 21 and the other chambers 38, respectively, the interconnected discharge devices and feed device of stacked tube bundles 21. A feed line 40 is connected to the chamber 37 and a discharge line 41 to the chamber 39 .

The partitions 36 have an outer, thicker section 42, to which they are fastened to the outer wall 35 by a plurality of screws 43, and an inner, thinner section 44, which extends to the inner wall 34 and between the openings for the tubes 22 two superimposed tube bundle 21 terminates on the inner wall 34. The width of the outer section 42 is approximately 60% of the total width of the partition 36. In the inner section 44 there are some bores, not shown, which allow the cooling unit 2 to be emptied. A sealing plate 45 is located between the outer wall 35 and the partition wall 36. For stabilization, the outer walls 35 can be provided with horizontally extending flat bars on the outside.

The front wall 19 and the rear wall 20 protrude slightly above and below the tube bundle 21, in these areas the sides of the cooling unit 2 are provided with side plates 46 and 47.

The cooling unit 2 can have a plurality, for example three, of tube bundles arranged next to one another when viewed from the front of the shaft cooler, one bundle consisting of tube bundles 21 lying one above the other. In this case, the front wall 19 and the rear wall 20 are provided with additional, for example two, longitudinal partition walls running between the tube packs, the corresponding wall having a plurality, for example three, feed lines 40 and just as many discharge lines 41.

The extraction unit 3 has a pull-out tray 48 delimiting the cooling unit 2 downward, and then a housing 49, in which the discharge screw 50 is located, on the pull-out tray 48. The housing 49 has a V-shaped cross section parallel to the width of the shaft cooler and extends over the entire length of the shaft cooler and thus parallel to the tubes 22 of the Cooling unit 2. The discharge screw 50 is located at the bottom of the housing 48 and essentially fills the constriction created by the V-shaped cross section. At the rear end of the housing 48 there is a discharge funnel 51 below the discharge screw 50.

The pull-out tray 48 has a first frame 52 with oblique guide plates 53 on its lateral edges and with U-profiles 54 rotated through 180 ° and running parallel to the broad side of the shaft cooler, a second frame 55 arranged below the first frame 52 and parallel to the broad side of the Shaft cooler-running, flat profiles 56 of the same number as the U-profiles 54 and a displacement device 57 fastened to the second frame 55. The flat profiles 56 of the second frame 55 are provided with tongue-shaped indentations 58 which are arranged at intervals from one another, the distance from the distance of the Profiles 56 and depth of the indentations 58 corresponds to the inner width of the U-profiles 54.

A shaft cooler according to the invention has, for example, a cooling unit 2 with a length of 2 m, a width of 1 m and a height of 1.5 m. The side length of the square of the tubes 22 is, for example, 25 mm, the distance 1 / 2a of the central axes 27 of the tubes 22 of rows one above the other is also 25 mm, the distance b of the alignment lines 24 and 25 is 10 mm and the distance of the grate bars 11 is 3 mm. The distance between the grate bars 11 is thus approximately 0.33 times the distance between the alignment lines 24 and 25.

The height of the side plates 32 is determined as a function of the angle of the alignment lines 24, 25 to the horizontal, their distance b, the angle of repose of the goods to be cooled and, if appropriate, the distance I. With an angle of repose of the bulk material to be cooled, for example the sand, of 33 °, a course of the escape lines 24, 25 at 45 ° to the horizontal, the distance b of the escape lines 24, 25 of 10 mm and the arrangement of the side plates 32 on the upper edges 23 of the tubes 22, a height of the side plate 23 of 12 mm plus 5 mm safety amount, ie 17 mm, could be sufficient. Since the shaft cooler of this example is subjected to vibrations, the height of the side plates 32 for a repose angle of 0 ° was twice the distance b plus one Security amount of 5 mm, ie designed for 25 mm. As already stated above, the height is thus 2.5 times the distance b or the distance b.

The distance between the grate bars can be 0.25 to 0.4 times the, if necessary average, distance of the alignment lines 24, 25.

In operation, the 800 ° C hot, dry bulk material, e.g. B. sand, the feed unit 1 through the two feed pipes 7 fed from above. The bulk material falls on the baffle plate 13, rushes along the baffle plate and falls on the bar grate 10. The bar grate 10 holds back coarse material. From time to time, the coarse material that has slipped or transported to the opening 14 in the feed unit 1 is drawn off through the opening 14 and the bottom opening 17 when the flap 15 is open.

The bulk material freed from the coarse material passes through the 3 mm wide gaps between the bars 11 of the bar grate 10 onto the two bulk cones which have formed in the upper area of the cooling unit 2 and in the lower area of the feed unit 1. The height of the pouring cone is regulated with the aid of a measurement of the fill level meter 18 by enlarging or reducing the openings in the pull-out tray 48 through the indentations 58 in the profiles 56 and, if appropriate, the gap between the profiles 56 to a desired value.

The bulk material flows along the cooling surfaces formed by the tubes 22 from top to bottom through the eight tube bundles 21 of the cooling unit 2, with a uniform outflow of the bulk material through the side plates 32 also being ensured at the lateral edges of the cooling unit 2.

The bulk material is cooled uniformly to 35 ° C. by the coolant, for example water, which is passed back and forth from bottom to top through the tube bundle 21 and thus in countercurrent to the bulk material. It reaches the discharge screw 50 through the openings in the pull-out tray 48, is conveyed to the discharge funnel 51 and is drawn off by the latter. A second shaft cooler according to the invention has an alternative arrangement of the side plates 32, which can be seen in FIG. The arrangement of the side plates 32 differs from that previously described in that the side plates 32 are attached to the outer edges 31 of the outer tubes 22. Their position corresponds, compared to that of the first example, to a parallel displacement along the upper edges 26 of the tubes 22 by the distance I outwards and downwards. The side surfaces 32 are also attached to the outer tubes 22 by welds 33. They extend the alignment lines 24 to a slight offset due to the weld seams 33.

Since in this example the shaft cooler is not subjected to any major vibrations, a height of 12 mm was assumed for side plates 32 attached to the upper edge 23 of the pipes 22 plus a larger safety amount of 13 mm and due to the displacement of the side plates 32 along the upper edges 26 the tubes 22 increased by a distance I of 23 mm by 5 mm to likewise 30 mm. The height of the side plates 32 is thus 3 times the distance b. If greater vibrations occur, the height of the side plates should be 32 43 mm (designed for an angle of repose of 0 °) plus a safety amount of 5 mm, i. H. 48 mm. As in the first example, sand was assumed as a bulk material with an angle of repose of 33 ° and the course of the lines 24, 25 at an angle of 45 ° to the horizontal was taken into account.

This arrangement of the side plates 32 leads to the formation of pockets which fill with bulk material during operation and form a heat insulation layer between the side plates 32 and the hot bulk material. This primarily protects the upper side panels 32 from excessive heating. This shaft cooler is particularly suitable for cooling very hot goods.

Claims

claims

1. shaft cooler with a cooling unit (1) with two opposite walls (19, 20) and at least one tube bundle (21) with tubes (22) that run horizontally between the walls (19, 20) and are arranged in several rows one above the other one

Rounding or an edge (23) are aligned vertically upwards, which are arranged offset to one another in successive rows, which are aligned obliquely to the vertical through the rows and which on one of the walls (20) with a feed device and on the opposite wall ( 19) are connected to a discharge device, characterized in that the cooling unit (2) instead of side walls on the laterally outer tubes (22) on their upper curves or edges (23) or on their outer lateral surfaces, curves or edges (31) the entire length of the side plates (32) running between the walls,

wherein the side plates (32) extend the escape lines which run obliquely to the vertical or run parallel to them and

have a height that is 1.2 to 5 times, in particular 1.5 to

4 times the average distance of the tubes (22) along the alignment lines (24, 25) is.

2. shaft cooler according to claim 1, characterized in that the tubes (22) of successive rows are offset by half the distance a between the central axes (27) of the tubes (22).

3. shaft cooler according to claim 1 or 2, characterized in that the tubes (22) have a square cross section, wherein one of the edges (23) of the tubes (22) is oriented vertically upward, so that the alignment lines (24, 25) run along the side surfaces (26, 27) of the tubes (22) at angles of 45 °.

4. shaft cooler according to claim 3, characterized in that the distances between horizontally and vertically opposite edges (23, 29, 30, 31) of the tubes (22) each 50 to 80%, in particular 60 to 70%, of

Side edges of the tubes (22) correspond.

5. shaft cooler according to one of claims 1 to 4, characterized by a plurality of pipe bundles (21) arranged one above the other, wherein the discharge device of a pipe bundle (21) is connected to the feed device of the next higher one.

6. shaft cooler according to claim 5, characterized in that the tubes (22) through all tube bundles (21) are arranged in alignment.

7. shaft cooler according to claim 5 or 6, characterized in that the two opposite walls as double walls, which are divided by partitions (36) into chambers (37, 38, 39), the lowermost chamber (37) one of the two walls Feeding device of the lowest tube bundle (21), the uppermost chamber (39) of one of the two walls forms the discharge device of the uppermost tube bundle (21), and the remaining chambers (38) each form the interconnected discharge device and feed device over other tube bundles (21).

8. The device according to claim 7, characterized in that the partition walls (36) have an outer thicker portion (42) to which they are attached, and an inner thin portion (44).

9. shaft cooler according to one of claims 1 to 8, characterized in that above the cooling unit (2) extends obliquely to the vertical of the bar grate (10), the distance between the grate bars (11) being 0.25 to 0.4 times the mean distance between the alignment lines (24, 25).