JP3849982B2 - Rotary dryer with indirect heating pipe - Google Patents

Description

  In the present invention, while rotating the rotating cylinder around its central axis, the material to be dried supplied to one end of the rotating cylinder is moved to the other end, and the heating tubes disposed in the rotating cylinder are vaporized. The present invention relates to a rotary dryer with an indirect heating tube that supplies a heating medium, contacts the moving object to be dried with this heating tube, and then discharges it from the other end of the rotating tube.

  This type of dryer, commonly referred to as a steam tube dryer, is characterized by a large heating area per volume, thus a large drying capacity and a high heat transfer rate.

  In addition, it has the advantage that it does not require exhaust gas treatment equipment and is easy to operate, and is widely used in the chemical industry, food industry, steel industry, etc., especially terephthalic acid, synthetic resin, soda ash, Has many achievements for drying fertilizers, corn products, coal, etc.

  This dryer usually has a length of 10 to 30 m. In the rotating cylinder, the wet powder or the granular material is brought into contact with a heating tube heated by a heat medium such as steam, and sequentially as the rotating cylinder rotates. It is made to dry continuously, moving to a discharge port. The vaporization heat medium for heating the heating pipe is supplied to the heating pipe through the rotary joint, and heat is supplied to the wet powder through the heating pipe to dry the wet powder. Condensate into a condensate, and flow down countercurrently to the vaporized heat medium along the gradient of the dryer, and is discharged from one end of the rotating cylinder.

  As this condensate discharging method, one having a structure as shown in FIG. 1 is known (see Patent Documents 1 and 2). That is, a double cylindrical manifold 30 having substantially the same diameter is integrated with one side in the axial direction of the rotary cylinder 10, and the inlet and outlet of the heating pipe 11 are connected to the manifold 30. In the manifold 30, a pumping plate 33 extends from the outer peripheral surface of the inner cylindrical portion 32 to the inner peripheral surface of the outer cylindrical portion 31 along the radial direction. The pumping plate 33 causes the manifold 30 to rotate. It is divided into multiple rooms. In each compartment in the manifold 30, a condensate outlet 34 is formed at the end of the end plate on the side of the rotary cylinder 10 on the center axis x side and on the rear side in the rotational direction. The end portion on the side is arranged on the rear side in the rotation direction of the condensate outlet 34. Therefore, the condensate that has flowed into the manifold 30 is lifted by the pumping plate 33 that is rotationally moved along with the rotary cylinder 10, and is guided to the condensate outlet 34 along the pumping plate 33 by the inclination of the pumping plate 33. Then, it is discharged to the introduction pipe 40 through the condensate outlet 34.

  Further, in order to discharge the condensate from the condensate outlet 34 of the manifold 30 to the outside of the apparatus, the condensate is discharged from the condensate outlet 34 of the manifold 30 to the center of rotation on the central axis x on the rotary cylinder 10 side. A liquid guide pipe 40 for guiding is provided, and a tip end of the liquid guide pipe 40 is connected to a base end of a connection pipe 50 provided at the center of rotation, and a tip end of the connection pipe 50 is disposed along the central axis. The discharge pipe 60 is connected to the base end, and the distal end of the discharge pipe 60 is connected to a fixedly arranged discharge path via a rotary joint (not shown). The connection pipe 50 is composed of a cylindrical tubular main body part and a partition plate 55 provided in the inside thereof along the radial direction, and a space corresponding to the number of liquid guide pipes 40 is formed by the partition plate 55. These spaces are respectively connected to the discharge pipe 60. Thus, the condensate is discharged from the rotating manifold 30 to the outside of the machine through a fixed discharge path.

  In order to supply the vaporized heat medium, an outer pipe 61 is disposed outside the discharge pipe 60, and a space between the pipes in the double pipe is a vaporized heat medium supply flow path 62. The upstream side of 62 is connected to a fixed supply path via a rotary joint (not shown), and a vaporized heat medium introduction pipe 63 is connected to the downstream end via an outer peripheral wall. The medium introduction pipe 63 extends in the radial direction from the center of rotation and is connected to the manifold 30. Thus, the vaporized heat medium is distributed and supplied to the heating pipe 11 after being supplied into the rotating manifold 30 from the fixedly arranged supply path.

However, it can be said that the conventional rotary dryer with an indirect heating tube has higher drying capacity than other dryers, but there is room for further improvement if the drying capacity with respect to the amount of vaporized heat medium used is examined in detail. There was found.
No. 7-40951 Japanese Patent Publication No.42-8110

  Therefore, the main object of the present invention is to improve the utilization efficiency of the vaporized heat medium and increase the drying capacity.

  As a result of intensive research on the rotary dryer with an indirect heating pipe, the present inventors have found that there is a bottleneck (that is, local stagnation) in the discharge of the condensate, and as a result, stagnation and backflow occur and remain in the heating pipe. Due to the cooling effect of the condensate, it has been found that the drying capacity is low for the amount of the vaporized heat medium used, in other words, the heat efficiency is low, and the present invention has been made. .

The first cause of the condensate discharge inhibition was the structure of the base end side portion (that is, the upstream portion) of the liquid introduction pipe. A conventional liquid introduction pipe includes a proximal end portion extending from the condensate outlet of the rotating cylinder side end plate of the manifold to the rotating cylinder side, and a distal end side extending from the distal end of the proximal end side portion to the rotation center portion. Part. However, when the condensate is discharged from the nihold through the liquid introduction pipe, the base end side portion of the liquid introduction pipe has a downward slope toward the manifold side. The liquid will also flow back to the manifold side unless boosted. In other words, after the condensate discharge from the manifold is completed, or after the condensate discharge process from the manifold is completed by the rotation accompanying the rotating cylinder, the condensate remains in the proximal end portion of the liquid introduction pipe. , Back flow into the manifold.

For this reason, the first aspect of the present invention includes a rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide pipe that guides the condensate pumped by the pumping section from the condensate outlet of the manifold to the center of rotation on the central axis outside the manifold;
A discharge path for guiding the condensate introduced into the rotation center by the liquid introduction pipe along the direction of the central axis;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
The liquid guide pipe has a proximal end portion extending from the condensate outlet of the manifold to the rotating cylinder side, and a distal end portion extending from the distal end of the proximal end portion to the rotation center portion, When the condensate is discharged from the manifold through the liquid introduction pipe, the base end side portion is configured to have an upward gradient toward the manifold side.

  In this case, the condensate that has flowed into the proximal end portion of the liquid guide pipe from the manifold receives a force toward the distal end portion along the inclination, and thus is difficult to flow backward. As a result, the entire condensate discharge from the manifold to the outside of the machine is promoted, the cooling effect of the condensate is reduced, thereby improving the thermal efficiency, and the higher drying capacity is exhibited even with the same amount of vaporized heat medium used. Become so.

The second cause of the condensate discharge inhibition was the condensate feed structure from the tip of the liquid guide tube to the discharge path along the central axis direction. That is, in the conventional dryer, the tip of the liquid guide pipe is configured to feed condensate from the direction orthogonal to the discharge path along the central axis direction. Turbulence formation occurred and smooth feeding was impossible.

For this reason, the second present invention comprises a rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide pipe that guides the condensate pumped by the pumping section from the condensate outlet of the manifold to the center of rotation on the central axis outside the manifold;
A discharge path for guiding the condensate introduced into the rotation center by the liquid introduction pipe along the direction of the central axis;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
The liquid guide pipe has a proximal end portion extending from the condensate outlet of the manifold to the rotating cylinder side, and a distal end portion extending from the distal end of the proximal end portion to the rotation center portion, This tip side portion is characterized in that the condensate is piped so as to feed the rotation center portion along the central axis direction.

  In this case, since it can feed linearly along the central axis from the liquid introduction pipe to the discharge path, smooth feeding becomes possible. As a result, the entire condensate discharge from the manifold to the outside of the machine is promoted, the cooling effect of the condensate is reduced, thereby improving the thermal efficiency, and the higher drying capacity is exhibited even with the same amount of vaporized heat medium used. Become so.

The third cause of condensate discharge inhibition was the shape of the connecting pipe connecting the liquid introduction path and the discharge path. The conventional connection pipe is provided with a partition plate in the cylindrical tube along the radial direction, and a space corresponding to the number of liquid guide paths is formed by the partition plate, and a plurality of liquid guide paths are connected to the liquid guide path side. An outlet having an inner diameter that is about half that of the inner diameter is formed in the end plate on the discharge path side, and a discharge path pipe is connected to the outlet. For this reason, the outlet of the connecting pipe is in the form of an orifice, and liquid collision and turbulent flow formation have occurred on the discharge path side end plate around the outlet, making smooth feeding impossible.

For this reason, the third aspect of the present invention includes a rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide path for guiding the condensate pumped by the pump section from the condensate outlet of the manifold to the rotation center on the central axis outside the manifold;
A discharge path for guiding the condensed liquid guided to the rotation center portion along the direction of the central axis by the liquid path;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
A connecting pipe is piped along the central axis direction at the center of rotation, and the liquid introduction path is connected to the discharge path through the connecting pipe,
The cross-sectional area of the flow path of the connecting pipe gradually decreases to the cross-sectional area of the discharge path from the liquid introduction path side toward the discharge path side, and the inner surface of the connection pipe flow path is aligned with the inner surface of the discharge path. It is a thing.

  In this case, the cross-sectional area gradually decreases as the flow path of the connection pipe moves toward the outlet side, and the inner surface is aligned with the discharge path, so that the condensate flowing through the connection pipe does not collide with the inner wall and smoothly flows to the discharge path. Will be sent to. As a result, the entire condensate discharge from the manifold to the outside of the machine is promoted, the cooling effect of the condensate is reduced, thereby improving the thermal efficiency, and the higher drying capacity is exhibited even with the same amount of vaporized heat medium used. Become so.

The fourth cause of the condensate discharge inhibition was the ability to transfer the condensate in the connecting pipe. That is, when the condensate is sent from the connecting pipe to the discharge path, boosting by the condensate on the upstream side is used. Further, the condensate is discharged intermittently rather than continuously, and the condensate is moved in a substantially horizontal direction from the connecting pipe to the discharge path. Therefore, when there is no boost from the upstream side, the condensate remains in the connection pipe, or the condensate flows backward from the discharge path side into the connection pipe. As a result, the condensate remaining in the connecting pipe also obstructs the flow of the next condensate.

For this reason, the fourth aspect of the present invention includes a rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide path for guiding the condensate pumped by the pump section from the condensate outlet of the manifold to the rotation center on the central axis outside the manifold;
A discharge path for guiding the condensed liquid guided to the rotation center portion along the direction of the central axis by the liquid path;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
A connecting pipe is piped along the central axis direction at the center of rotation, and the liquid introduction path is connected to the discharge path through the connecting pipe,
A screw blade is provided in the connecting pipe to push the condensate toward the discharge path.

  In this case, since the condensate sent into the connecting pipe is forced out into the discharge path by the screw blades, problems such as residual condensate in the connecting pipe hardly occur. As a result, the entire condensate discharge from the manifold to the outside of the machine is promoted, the cooling effect of the condensate is reduced, thereby improving the thermal efficiency, and the higher drying capacity is exhibited even with the same amount of vaporized heat medium used. Become so. Such forced discharge is particularly suitable when condensate is sent from a plurality of liquid conduits to the connecting pipe and merged.

In the fourth aspect of the present invention, the screw blade is fixed in the connection pipe, and is configured to push the condensate toward the discharge pipe by rotation of the connection pipe accompanying rotation of the rotary cylinder. It is preferable because a separate power source is not required and the apparatus can be simplified and the cost can be reduced ( fifth aspect of the present invention).

As described above, according to the present invention, since the condensate discharge from the manifold to the outside of the apparatus becomes smooth, the utilization efficiency of the vaporized heat medium is improved and the drying capacity is increased. A plurality of the above first to fifth inventions can be combined, and in that case, further improvement in drying capacity can be achieved.

Hereinafter, although an embodiment of the present invention will be described in detail with reference to the accompanying drawings, it is needless to say that the present invention is not limited to this.
1 to 3 show a steam tube dryer 1 to which the present invention is applied. The steam tube dryer 1 includes a horizontally long rotating cylinder 10. Tires 16 are provided on the outer peripheral surfaces on both sides of the central axis direction x of the rotary cylinder 10, and the rotary cylinder 10 can be rotated by a support roller 17 installed on a base 18 via these tires 14. It is supported. The width between the support rollers 17 and the inclination angle in the longitudinal direction thereof are selected in accordance with the downward gradient and the diameter of the rotary cylinder 10.

  Further, in order to rotate the rotating cylinder 10, a driven gear 19 is provided around the rotating cylinder 10, and a driving gear (not shown) is engaged with the rotating cylinder 10, and the driving gear 21 is rotated by this driving gear. The force is transmitted through the speed reducer 20 so that the rotary cylinder 10 rotates about its axis.

  An insertion portion 12 for an object to be dried is connected to an end plate on one side in the central axis direction x of the rotary cylinder 10 via a rotary joint 13. The charging section 12 can be constituted by various conveyors or chutes that communicate with the rotary cylinder 10. The object to be dried is inserted into the rotary cylinder 10 through the rotary joint 13 from the fixedly installed charging section 12.

  A large number of heating tubes 11 are arranged in the rotating cylinder 10. The heating tube 11 is arranged in parallel to the central axis direction x of the rotary cylinder 10. More specifically, as shown in FIG. 2, the heating tubes 11 are arranged on the entire inner peripheral surface side portion (a peripheral portion excluding the central portion) in the rotary cylinder 10. The number and arrangement of the heating tubes 11 can be determined as appropriate. The heating tube 11 is supported by end plates on both sides of the rotating cylinder 10. If necessary, in order to support the heating tube 11, a support plate (not shown) can be added at an intermediate position in the longitudinal direction in the rotary cylinder 10. In this case, the heating tube 11 is supported not only by the end plates on both sides of the rotating cylinder 10 but also by the inner peripheral surface. Steam as a heating medium is supplied to these heating tubes 11 through the supply / discharge system described later.

  The material to be dried inserted into the rotating cylinder 10 is repeatedly lifted in the circumferential direction by the rotation of the rotating cylinder 10 and then dropped, while the rotating cylinder 10 is installed with a descending gradient, so that It is transferred to the opposite side with respect to the entrance 12. In this process, the object to be dried is heated by contact with the heating tube 11 and drying proceeds. A dry matter discharge portion 14 is provided at an end of the rotary cylinder 10 opposite to the charging portion 20. The dried product is discharged from the discharge unit 14. The discharge unit 14 can be constituted by various conveyors and chutes.

  An exhaust gas outlet 15 for discharging gas such as steam generated by drying is provided on the discharge unit 14 side in the rotary cylinder 10. The exhaust gas from the exhaust gas outlet 15 can be configured to be released to the atmosphere via an exhaust gas treatment facility (not shown) as necessary.

On the other hand, the steam supply / discharge system to which the present invention is applied is provided at the end of the rotary cylinder 10 on the discharge part 14 side in the present embodiment, and specific examples of the structure are shown in FIGS. ing. That is, the manifold 30 is integrated with the end of the rotating cylinder 10 on the discharge unit 12 side, and the inlet and outlet of the heating tube 11 communicate with the manifold 30. The manifold 30 is a double cylindrical body having an outer cylindrical portion 31 that is substantially the same diameter as the rotary cylinder 10 and an inner cylindrical portion 32 that is located slightly on the center axis side of the arrangement region of the heating tube 11. . In the manifold 30, a pumping plate 33 extends from the outer peripheral surface of the inner cylindrical portion to the inner peripheral surface of the outer cylindrical portion 31 along the radial direction. The manifold 30 is partitioned into a plurality of chambers in the rotational direction by the pumping plate 33. Each compartment in the manifold 30 is formed with a condensate outlet 34 at a corner of the end plate 30a on the rotary cylinder 10 side on the central axis x side and on the rear side in the rotational direction. An end portion of the pumped liquid plate 33 on the inner cylindrical portion 32 side is disposed on the rear side in the rotation direction of the condensate outlet 34. The weir plate 35 in proximity to the rotation direction front side of the condensable fluid outlet 34 is provided. The dam plate 35 extends from the inner cylindrical portion 32, and a predetermined interval is provided between the tip of the dam plate 35 and the outer cylindrical portion 31. This interval (in other words, the height of the weir plate) is such that the condensate discharged into the manifold 30 sequentially flows between the pumping plate 33 and the weir plate 35 during one cycle, and from the weir plate 35. It can be set to the extent that it does not spill.

  The condensate that has flowed into the manifold 30 is lifted by the pumping plate 33 that is rotated in the direction of the arrow in the drawing along with the rotary cylinder 10, and then the condensate is moved along the pumping plate 33 due to the inclination of the pumping plate 33. It is guided to the outlet 34 and discharged through the condensate outlet 34. At this time, if the dam plate 35 is provided close to the front side in the rotational direction of the condensate outlet 34, the condensate 35 that has reached the vicinity of the condensate outlet 34 is scattered and moved to the front side in the rotational direction by the dam plate 35. The condensate is discharged from the manifold 30 more efficiently and more reliably.

  In order to discharge the condensate from the condensate outlet 34 of the manifold 30 to the outside of the machine, a guide for guiding the condensate from the condensate outlet 34 of the manifold 30 to the center of rotation on the central axis x on the rotary cylinder 10 side of the manifold 30. A liquid pipe 40 is provided. The leading end of the liquid guiding pipe 40 is connected to the base end of a connecting pipe 50 provided at the center of rotation. Further, the distal end of the connection pipe 50 passes through the central cavity of the inner cylinder part 32 of the manifold 30 along the central axis x, and the proximal end of the discharge pipe 60 extends linearly to the outside opposite to the rotary cylinder 10 side. It is connected to the. Further, the distal end of the discharge pipe 60 is connected to a fixedly arranged outlet pipe 80 via a rotary joint 70 shown in FIG. Thus, the condensate is discharged out of the machine from the rotating manifold 30 through the fixedly arranged outlet pipe 80.

  In this embodiment, the steam supply system for the manifold 30 takes a similar path. That is, in order to supply the vaporized heat medium, an outer pipe 61 is disposed outside the discharge pipe 60, and a gap 62 between the pipes in the double pipe is used as a vaporized heat medium supply flow path. The upstream side of the supply flow path 62 is connected to a fixedly arranged supply pipe 81 via a rotary joint 70. A vaporized heat medium introduction pipe 63 is connected to the downstream end portion via an outer peripheral wall, and this vaporization heat medium introduction pipe 63 extends in the radial direction from the central shaft portion and is connected to the manifold 30. . In the illustrated example, the connection position of the vaporized heat transfer medium introduction pipe 63 is approximately the center in the rotation direction between the liquid pumping plates 33 and the vicinity of the inner cylindrical portion 32. Thus, the vaporized heat medium is supplied from the fixedly arranged supply pipe 81 into the rotating manifold 30 and then distributed and supplied to the heating pipe 11.

  By the way, by providing the above-described weir plate 35, the condensate is more reliably discharged from the manifold 30 and the efficiency is improved. However, if there is a bottleneck on the downstream side, as shown in FIG. Before the discharge is completed, the pumping plate 33 and the weir plate 35 reach a position where the condensate cannot be guided (the upper position in the illustrated example), and after the discharging process by the compartment is completed, The postures of the plate 33 and the weir plate 35 are reversed. Therefore, the condensate waiting to be discharged in the vicinity of the condensate outlet 34 in the manifold 30 leaves the position and remains in the manifold 30 without being discharged, as shown in FIG. When this situation occurs, the condensate flows backward to the heating pipe 11 and the heating temperature decreases, or the temperature decreases due to contact with the steam supplied through the manifold 30, thereby reducing the drying capacity. It will decline.

Therefore, it is desirable to apply the first to fourth aspects of the present invention in combination as in the forms shown in FIGS. Hereinafter, this application portion will be described in order from the condensate outlet 34 side of the manifold 30.

The portion to which the first aspect of the present invention is applied is a base end side portion 41 of the liquid guide pipe 40 for guiding the condensate from the condensate outlet 34 of the manifold 30 to the connection pipe 50 at the center of rotation. Conventionally, the manifold 30 is provided at the end of the rotating cylinder 10 on the discharge portion 14 side, and the proximal end portion 41 of the liquid introduction pipe 40 extends to the rotating cylinder 10 side of the manifold 30 in parallel with the rotating cylinder 10. It was. Furthermore, the rotary cylinder 10 was inclined so as to have a downward slope toward the discharge portion 14 side. For this reason, the base end side portion 41 of the liquid introduction pipe 40 has a downward slope toward the manifold 30 side. In this case, not only the condensate remaining in the manifold 30 but also the condensate remaining in the proximal end portion 41 of the liquid introduction pipe 40 flows back to the manifold 30 after the discharge process is completed.

On the other hand, according to the first aspect of the present invention, when the condensate is discharged from the manifold through the liquid guide pipe, the base end side portion 41 of the liquid guide pipe 40 has an upward slope toward the manifold side. With this configuration, even after the discharge step is completed, the condensate present in the proximal end portion 41 of the liquid introduction tube 40 receives gravity toward the distal end portion 42 due to the inclination, and flows backward. No longer. Such a configuration is the configuration shown in the figure, that is, the rotary cylinder 10 is inclined downward toward the discharge section 14, and the manifold 30 is disposed on the discharge section 14 side of the rotary cylinder 10. When the base end side portion 41 of the liquid introduction pipe 40 is extended to the rotary cylinder 10 side of the manifold 30, the base end side portion 41 of the liquid introduction pipe 40 is separated from the manifold 30. This can be achieved by being inclined so as to approach the center of rotation as the distance increases. In the illustrated embodiment, as the rotary cylinder 10 rotates, the inclination of the base end side portion 41 of the liquid introduction pipe 40 will eventually be opposite, but until that time there is room for flow to the downstream side. The discharge of the condensate is much more efficient than before.

The portion to which the second aspect of the present invention is applied is a connection form of the tip side portion 42 of the liquid guide tube 40 to the connection tube 50. Since the tip end portion 42 has been conventionally connected perpendicularly to the connecting pipe 50 installed at the center of rotation, the condensate cannot flow smoothly, affecting the smooth discharge of the condensate upstream. It was. On the other hand, according to the second aspect of the present invention, when the tip side portion 42 of the liquid introduction pipe 40 is piped so as to feed the condensate along the central axis x direction to the connection pipe 50, the condensate Since it can be fed linearly, the condensate can be fed smoothly. In the illustrated embodiment, the connection pipe 50 is coaxially arranged with the central axis x direction as the center, and the end of each liquid guide pipe 40 is connected to the end plate 51 on the rotating cylinder 10 side. Further, in order to enable this connection, the proximal end portion 41 of the liquid introduction pipe 51 is extended to the rotating cylinder 10 side slightly longer than before. Then, after the distal end side portion 42 is bent in the direction of the center axis x, the center axis is curved so as to approach the center axis x toward the direction opposite to the rotation direction. After being bent in a direction along the direction of the central axis x toward the rotating cylinder side end plate 51 of the connection pipe 50 in the vicinity, the connection pipe 50 is connected to the connection pipe 50.

The portion to which the third invention is applied is in the shape of the connecting pipe 50. A conventional connecting pipe is provided with a partition plate in a radial direction in a cylindrical tube, and a space corresponding to the number of liquid introduction paths is formed by this partition plate, and the outlet of the connecting pipe has an orifice shape. The condensate collided with the end plate 52 around the outlet and turbulent flow occurred, making it impossible to smoothly feed the condensate. On the other hand, according to the third aspect of the present invention, the cross-sectional area gradually decreases as the flow path of the connection pipe 50 moves toward the outlet side, and the inner surface is aligned with the discharge pipe 60 (that is, continuous without unevenness). Then, the condensate flowing through the connection pipe 50 is smoothly fed into the discharge pipe 60 without colliding with the inner wall. In the illustrated form, the shape of the connection pipe 60 is a conical cylinder (in other words, a funnel shape).

The part to which the fourth aspect of the present invention is applied is the ability to transfer the condensate in the connecting pipe 50. Conventionally, when the condensate is sent from the connection pipe 50 to the discharge pipe 60, the condensate may remain in the connection pipe 50, or the condensate may flow backward from the discharge pipe 60 into the connection pipe 50. Yes, this affected the smooth condensate discharge on the upstream side. On the other hand, according to the fourth aspect of the present invention, a screw blade 53 for pushing the condensate toward the discharge pipe 60 is provided in the connection pipe 50. In this case, since the condensate sent into the connection pipe 50 is forcibly pushed into the discharge pipe 60 by the screw blades 53, problems such as residual condensate in the connection pipe 50 are less likely to occur. Such forced discharge is particularly suitable when the condensate is sequentially sent from the plurality of liquid guide pipes 40 to the connection pipe 50 and joined. In the illustrated embodiment, the screw blade 53 is fixed in the connection pipe 50 and is configured to push the condensate inside toward the discharge pipe 60 by the rotation of the connection pipe 50 accompanying the rotation of the rotary cylinder 10. Yes. In this case, a separate power source is not required, and the apparatus can be simplified and the cost can be reduced.

  By combining the configurations described above, the condensate discharge from the manifold 30 to the outside of the machine is promoted, the cooling effect by the condensate is reduced, thereby improving the thermal efficiency and using the same vaporized heat medium. Higher drying capacity will be exhibited even in the amount.

  As mentioned above, although preferred embodiment was described, various deformation | transformation are possible for this invention within the range. For example, although the above example uses steam as the heat medium, other heat medium can also be used. Moreover, although the said example has applied all the 1st-5th this invention, it can also apply combining any one or more suitably.

  The present invention includes high-density polyethylene, polycarbonate, polyester carbonate, polyphenylene ether, polyvinyl chloride, atomized iron powder, porous alumina, polyacetal, coal, corn germ fiber, iron oxide, calcium carbonate, potassium fluoride, silica gel, gluten As represented by drying of feed, beer lees, polyethylene, methylcellulose, dried sludge, etc., it can be applied to a wide range of uses.

FIG. 1 is a front view of a steam tube dryer according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view showing a BB cross section (upper portion with respect to the central axis) and a CC cross section (lower portion with respect to the central axis) in FIG. 2. FIG. 4 is an enlarged view of the connecting pipe portion. FIG. 12 is a cross-sectional view of a conventional steam tube dryer. 13 is a cross-sectional view taken along the line DD of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Steam tube dryer, 10 ... Rotating cylinder, 11 ... Heating pipe, 12 ... Insertion part, 13 ... Rotary joint, 14 ... Discharge part, 30 ... Manifold, 31 ... Outer cylinder part, 32 ... Inner cylinder part, 33 ... Lifting plate, 34 ... condensate outlet, 35 ... weir plate, 40 ... liquid introduction pipe, 41 ... base end side portion, 42 ... tip end side portion, 50 ... connecting pipe, 53 ... screw blade, 60 ... discharge pipe.

Claims (5)

A rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide pipe that guides the condensate pumped by the pumping section from the condensate outlet of the manifold to the center of rotation on the central axis outside the manifold;
A discharge path for guiding the condensate introduced into the rotation center by the liquid introduction pipe along the direction of the central axis;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
The liquid guide pipe has a proximal end portion extending from the condensate outlet of the manifold to the rotating cylinder side, and a distal end portion extending from the distal end of the proximal end portion to the rotation center portion, When the condensate is discharged from the manifold through the liquid introduction pipe, the base end side portion is configured to have an upward slope toward the manifold side, and the rotary drying with an indirect heating pipe is characterized in that Machine. A rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide pipe that guides the condensate pumped by the pumping section from the condensate outlet of the manifold to the center of rotation on the central axis outside the manifold;
A discharge path for guiding the condensate introduced into the rotation center by the liquid introduction pipe along the direction of the central axis;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
The liquid guide pipe has a proximal end portion extending from the condensate outlet of the manifold to the rotating cylinder side, and a distal end portion extending from the distal end of the proximal end portion to the rotation center portion, The tip-side portion is piped so as to feed condensate along the central axis direction with respect to the rotation center portion. A rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide path for guiding the condensate pumped by the pump section from the condensate outlet of the manifold to the rotation center on the central axis outside the manifold;
A discharge path for guiding the condensed liquid guided to the rotation center by the liquid path along the direction of the central axis;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having:
A connecting pipe is piped along the central axis direction at the center of rotation, and the liquid introduction path is connected to the discharge path through the connecting pipe,
The cross-sectional area of the flow path of the connecting pipe gradually decreases to the cross-sectional area of the discharge path from the liquid introduction path side toward the discharge path side, and the inner surface of the connection pipe flow path is aligned with the inner surface of the discharge path. A rotary dryer with an indirect heating tube. A rotating cylinder,
Rotation driving means for rotating the rotating cylinder around its central axis;
A to-be-dried product supply unit and a dried product discharge unit provided respectively at one end and the other end of the rotating cylinder;
A manifold provided to rotate integrally with the rotary cylinder on one side in the central axis direction of the rotary cylinder;
A condensate outlet provided on one side wall in the central axis direction of the manifold;
A number of heating tubes provided so as to pass through the rotating cylinder and having both ends opened in the manifold;
A pumping section provided in the manifold;
A liquid guide path for guiding the condensate pumped by the pump section from the condensate outlet of the manifold to the rotation center on the central axis outside the manifold;
A discharge path for guiding the condensed liquid guided to the rotation center portion along the direction of the central axis by the liquid path;
Means for supplying a vaporized heat medium into the manifold;
In a tumble dryer having
A connecting pipe is piped along the central axis direction at the center of rotation, and the liquid introduction path is connected to the discharge path through the connecting pipe,
A rotary dryer with an indirect heating pipe, wherein a screw blade for pushing the condensate toward the discharge path is provided in the connection pipe. 5. The indirect according to claim 4 , wherein the screw blade is fixed in the connection pipe and configured to push the condensate toward the discharge pipe by rotation of the connection pipe accompanying rotation of the rotary cylinder. Rotary dryer with heating tube.

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