JP2015028406A - Drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drier such that a conveyance path for returning dry matter to a desired place is easily arranged.SOLUTION: A dryer 1 that dries a body R to be dried by bringing the dried body R to be dried thrown in a main body shell 2 from a throw-in opening 21 into contact with a multitubular heat pipe 3 rotating in the main body shell 2, and discharges the dried body D from the inside of the main body shell 2 includes a conveyance path 5 serving as a path for conveyance of the dried body D discharged from the inside of the main body shell 2 to a throw-in opening side with a carrier gas, and a heater 7 which heats the carrier gas, and the main body shell 2 is configured to receive the heated carrier gas and the dried body D having been conveyed.

Description

  The present invention relates to a dryer for drying a material to be dried by bringing it into contact with a multi-tube heating tube rotating in the main body shell and discharging the dried material from the inside of the main body shell. .

  Wastewater treatment sludge, animal and vegetable residue, food residue or sludge waste, etc., in the process of recycling and disposal, etc. 2. Description of the Related Art As a dryer for agricultural chemicals, foods and the like, a dryer provided with a main body shell and a multi-tube heating tube that rotates in the main body shell is known. In this dryer, a multi-tube heating tube is heated by flowing saturated steam or the like into the multi-tube heating tube, and the heated multi-tube heating tube is brought into contact with an object to be dried such as sludge. Conductive heat transfer type that conducts heat to dry matter. The main body shell includes an input port through which an object to be dried is input and an exhaust port through which the dried object obtained by drying the object to be dried is discharged. Between the input port and the discharge port, a drying process is performed while the input material to be dried remains in the main body shell. The main body shell is installed on the machine frame or the like in a state of extending in the horizontal direction or in a direction inclined slightly downward from the inlet side toward the outlet side. The multi-tube heating tube has a heating tube bundle in which a plurality of heating tubes are arranged at predetermined intervals. This heating tube bundle generally has a circular trajectory connecting the outermost heating tubes arranged in the rotation direction, and rotates into the main body shell around the rotation axis along the extending direction of the main body shell. Arranged freely. In many cases, a multi-tube heating tube is provided with a lifter that scoops up an object to be dried that stays in the main body shell when rotating.

  In such a dryer, the material to be dried thrown in from the charging port is scraped up by the lifter of the rotating multi-tube heating tube, and comes into contact with each heating tube of the multi-tube heating tube when falling. The moisture evaporates from the material to be dried, and the material to be dried can be dried. That is, the outer peripheral surface of each heating tube becomes a heat transfer surface that transfers heat to the object to be dried. Moreover, a to-be-dried material can also be dried by stirring a to-be-dried material with rotation of a multi-tube heating tube. The material to be dried is gradually moved to the discharge port side while the moisture content is lowered by repeated contact with the heating tubes and stirring, and is eventually discharged as a dry product from the discharge port. Here, in a state where the vapor evaporated from the object to be dried remains in the main body shell, the evaporation of moisture from the object to be dried is inhibited. Therefore, in order to positively discharge the vapor evaporated from the material to be dried out of the main body shell, the internal shell is sucked using an exhaust fan or the like. By supplying air called air into the main body shell, an operation in which steam is accompanied by air or steam is pushed out by air is normally performed. In addition, when a gas having a low temperature contacts the multitubular heating tube, heat exchange occurs between the gas and the multitubular heating tube, and the amount of heat such as saturated steam for heating the multitubular heating tube is lost. . Or when the vapor | steam which evaporated from the to-be-processed object contacts with the gas with low temperature, it will condense and will moisten the to-be-processed object and the inside of a main body shell. For this reason, air heated to a predetermined temperature or the like is generally used as the carrier air.

  The to-be-dried material just thrown in from the inlet has a high water content, high viscosity, and poor dispersibility. For this reason, what is called a bridge | bridging that the to-be-dried material becomes a lump in the vicinity of the charging port and is spanned between the heating tubes may occur. Hereinafter, a lump in a state where an object to be dried is stretched between the heating tube and the heating tube may be referred to as a bridge. The portion of the heating tube where the bridge has occurred remains covered with a specific object to be dried and cannot be contacted by another object to be dried. In addition, if a bridge is formed between the heating tubes arranged outside the heating tubes constituting the heating tube bundle, it becomes difficult for the material to be dried to flow inside the heating tube bundle, and it is arranged inside the heating tube bundle. An object to be dried does not come into contact with the heated tube. As a result, there is a problem that the use efficiency of the heat transfer surface of the heating tube is lowered and the drying capacity is lowered. For this reason, a dryer has been proposed that lowers the moisture content of the material to be dried in the vicinity of the inlet and prevents the multi-tube heating tube from being bridged (see, for example, Patent Document 1).

  The dryer described in Patent Document 1 has an outlet on the outlet side of the main body shell, a return port on the inlet side of the main body shell, and a screw conveyor disposed between the outlet and the return port. Yes. In this dryer, a part of the dried material that has moved to the discharge port side is received by the take-out port, conveyed by the screw conveyor, and returned from the return port to the input port side in the main body shell. As a result, the dried product is mixed with the material to be dried having a high moisture content on the inlet side, and the apparent moisture content of the material to be dried on the inlet side is lowered. Thus, the viscosity of the material to be dried on the inlet side is lowered and the dispersibility is improved, so that a bridge is not generated in the multi-tube heating tube, and a decrease in the drying capacity is suppressed.

JP 2006-17335 A

  However, in the dryer described in Patent Document 1, a screw conveyor is disposed on a conveyance path for returning the dried product to the inlet of the main body shell. When using a screw conveyor, the conveyance path must be linear, for example, and in order to return the dried product to a desired location on the inlet side of the main body shell, several linear screw conveyors are combined and conveyed. There is a big restriction because the route must be arranged.

  In view of the above circumstances, the present invention facilitates the arrangement of a conveyance path for returning a dried product to a desired location, accepts not only the dried product but also a heated carrier gas in a dryer, and actively uses it for drying. The purpose is to provide a machine.

The dryer of the present invention that solves the above-mentioned object dries the material to be dried by bringing the material to be dried, which has been charged into the main body shell from the inlet, into contact with a multi-tube heating tube that rotates within the main body shell. In a dryer that discharges dry matter from the body shell,
A transport path serving as a path when the dry matter discharged from within the main body shell is transported by the transport gas to the input port side;
Heating means for heating the carrier gas,
The main body shell receives heated carrier gas and dried material that has been conveyed.

Here, the heating means is provided on the upstream side of the transport path,
The aspect provided with the conveyance gas supply means which supplies the conveyance gas heated with the said heating means to the said conveyance path | route may be sufficient. Or the said heating means may heat the conveyance gas which conveyed the dried material, for example, may be provided in the downstream of the said conveyance path | route.

  Moreover, the aspect provided with the distribution means which sends a part of said dry matter to the said conveyance path | route, and discharges the remaining dry matter, The return operation | movement which sends the said dry matter to the said conveyance path | route, The aspect provided with the switch operation | movement means which switches and performs discharge operation | movement which discharges a dried material may be sufficient. The main body shell may have a discharge port for discharging the dry matter, and the distribution means may be provided between the discharge port and the transport path.

  Further, the carrier gas may be air or an inert gas such as nitrogen or carbon dioxide other than air.

  According to the dryer of the present invention, since the transport gas for transporting the dried product is used, restrictions on the arrangement of the transport path are reduced as compared with the case where a screw conveyor or the like is used, and the dried product is returned to a desired location. Arrangement of the conveyance path becomes easy. Moreover, just using the carrier gas at room temperature, if this carrier gas at room temperature is introduced into the main body shell, the amount of heat such as saturated steam that heats the multi-tubular heating tube as described above is lost. According to the dryer of the present invention, the heating means for heating the carrier gas is provided, and the carrier gas heated by the heating means is received by the main body shell. For this reason, this carrier gas can be shared as carrier air.

Further, in the dryer of the present invention, the main body shell is provided with a common receiving port to which the transport path is connected on the inlet side,
The common receiving port may be configured to guide the dried material transported by the transport gas into the main body shell together with the transport gas.

  By doing so, even if a bridge is formed in the multi-tube heating tube, it is possible to collide the dried material with the carrier gas and break the bridge.

Furthermore, in the dryer of the present invention, the multi-tube heating tube has a plurality of heating tubes arranged around the rotation axis around the rotation axis, and the heating tubes arranged on the outermost side are connected in the rotation direction. The trajectory is circular,
When the multi-tube heating tube that rotates clockwise is viewed clockwise (that is, when the upper position is set to 0 or 12 o'clock and the lower position is set to 6 o'clock), It is preferable that the main body shell is provided in a circular shape toward a predetermined position within a range from the 9 o'clock position to the 3 o'clock position.

  Here, even when the amount of the object to be dried that stays in the main body shell is small, when the multi-tube heating tube that rotates clockwise is viewed clockwise, it stays in the main body shell. In many cases, the object to be dried is maintained so as to be accumulated within the range from the 5 o'clock position to the 9 o'clock position in the circular shape so as to ensure the high drying efficiency of the dryer and the stability of the continuous drying operation.

  It should be noted that the amount of the material to be dried that stays in the main body shell often fluctuates for various reasons. Against this fluctuation, the present invention ensures the high drying efficiency of the dryer and the stability of the continuous drying operation. However, it is made to the extent that it can cope.

  The common receiving port is provided in the main body shell toward a predetermined position within a range from the 9 o'clock position to the 3 o'clock position in the circular shape when viewed in the clockwise direction. The dried material that is introduced into the interior is not blocked by the accumulated material to be dried. When viewed clockwise, the common receiving port is provided from the 3 o'clock position in the circular shape in the main body shell to the object to be dried that remains in the main body shell. Even if the bridge formed within the range is broken, the broken dried material is difficult to enter in the direction of the rotation axis of the multi-tube heating tube, and between the outermost periphery of the multi-tube heating tube and the inner surface of the main shell. Therefore, the contact with the heating tube is not performed efficiently, and the effect of improving the drying efficiency is small.

Furthermore, in the dryer according to the present invention, the transport path includes a separation unit that separates the transport gas and a dried product transported by the transport gas.
The main body shell may be provided with a dry material receiving port for receiving the dried material and a carrier gas receiving port for receiving the carrier gas separated by the separating means.

  By carrying out like this, the said dried material and carrier gas can be guide | induced into a main body shell from a different position. For example, when the multi-tube heating tube that rotates clockwise is viewed clockwise, the dried product is placed around the 12 o'clock in the circle so that the dried product is efficiently mixed with the material to be dried. The carrier gas may be introduced from the position into the main body shell, and the carrier gas may be introduced into the main body shell from a portion where the bridge starts to be formed in the multitubular heating tube.

In the dryer of the present invention, the multi-tube heating tube has a plurality of heating tubes arranged around the rotation axis around the rotation axis, and the heating tubes arranged on the outermost side are connected in the rotation direction. The trajectory is circular,
When the multi-tube heating tube that rotates clockwise is viewed clockwise, the carrier gas receiving port is directed from a position at 3:30 to a position within the 12 o'clock position in the circle. It is preferable that the main body shell is provided.

  Here, when the amount of to-be-dried matter staying in the main body shell is large, the multi-tubular heating tube rotating clockwise is staying in the main body shell when viewed clockwise. In some cases, the object to be dried accumulates in the range of 3:30 to 10 o'clock in the circular shape. By providing the carrier gas inlet toward the predetermined position within the range of 3:30 to 10:00 in the circular shape, the carrier gas is introduced toward the object to be dried and is to be dried. It is possible to improve the dispersibility of the object and make it difficult to form a bridge. Further, when the object to be dried does not stay and is viewed in the clockwise direction, the carrier gas is directed toward a predetermined location within the range from 10 o'clock to 12 o'clock in the circular shape in the main body shell. If the is introduced, the bridge generated in the heating tube can be broken, and the broken material to be dried can be efficiently brought into contact with the heating tube arranged inside.

  According to the present invention, it is easy to arrange a transport path for returning a dried product to a desired location. A dryer that accepts not only a dried product but also a heated carrier gas to the dryer and actively uses it for drying is provided. Can be provided.

It is a block diagram which shows an example of the dryer corresponded to one Embodiment of this invention. (A) is a figure which shows typically the cross section of the main body shell shown in FIG. 1, (b) is FIG. 2 (a) in the modification of the dryer shown in FIG. 1 and FIG. 2 (a). It is a figure which shows the aspect corresponding to. (A) is the block diagram which extracts and shows the part centering on the main body shell in the dryer of 2nd Embodiment, (b) is a cross section of the main body shell shown to (a) typically. FIG. (A) is a figure which shows the aspect corresponding to FIG.3 (b) in the 1st modification of the dryer shown to Fig.3 (a) and the same figure (b), (b) is FIG. It is a figure which shows the aspect corresponding to FIG.3 (b) in the 2nd modification of the dryer shown to a) and the same figure (b).

  Embodiments of the present invention will be described below with reference to the drawings. The dryer according to one embodiment of the present invention includes wastewater treatment sludge, animal and vegetable residues, food residue or sludge waste recycling, disposal, etc., or sludge generated in the manufacture of processed foods, resin products, etc. To be dried, or chemical products such as resins, medical and agrochemical products, foods and the like.

  FIG. 1 is a block diagram showing an example of a dryer corresponding to an embodiment of the present invention.

  As shown in FIG. 1, the dryer 1 includes a main body shell 2, a multi-tube heating tube 3 disposed in the main body shell 2, a distribution mechanism 4, and a conveyance path 5. The main body shell 2 is supported in a state extending in the horizontal direction by a machine frame (not shown) or the like. Hereinafter, the direction in which the main body shell 2 extends may be referred to as the extending direction.

  The main body shell 2 is provided with an input port 21, a discharge port 22, a common receiving port 23, a carrier air port 24, and an exhaust port 25. The insertion port 21 is a port through which to-be-dried material R (see FIG. 2) such as sludge is introduced, and is located on the left side of the main body shell 2 shown in FIG. Yes. Note that a plurality of input ports 21 may be provided at predetermined intervals in the extending direction. The discharge port 22 is subjected to a drying process described later while the material R to be dried input from the input port 21 stays in the main body shell 2. It is an opening which is discharged as shown in FIG. The discharge port 22 is provided near the right side of the main body shell 2 shown in FIG. The discharge port 22 is provided with a dam member 221 whose height is freely adjustable. By adjusting the height of the dam member 221, the height of the lower end position in the opening portion of the discharge port 22 can be adjusted. . By this adjustment, the amount of the material to be dried R staying in the main body shell 2 can be adjusted. Further, a chute 222 is disposed in a portion of the main body shell 2 where the discharge port 22 is provided. The material R to be dried input from the input port 21 moves from the left side to the right side in the main body shell 2 shown in FIG. 1 and is discharged from the discharge port 22 before long. That is, in the main body shell 2 shown in FIG. 1, the left side is the inlet side and the right side is the outlet side. The main body shell 2 may be installed in the machine frame or the like in a state of extending in a direction slightly inclined downward from the inlet side toward the outlet side.

  The common receiving port 23 guides the dried material D conveyed by the carrier gas into the main body shell 2 together with the carrier gas. Detailed explanation about conveyance of dry matter D is mentioned below. The common receiving port 23 is provided at a position slightly closer to the loading port 21 than the loading port 21 in the extending direction of the main body shell 2. The common receiving port 23 may be provided at substantially the same position as the insertion port 21 in the extending direction of the main body shell 2. Further, as long as the position is close to the insertion port 21, it may be provided closer to the discharge port than the insertion port 21. However, in order to directly mix the dried material R having a high water content introduced from the inlet 21 with the dried material R having a reduced moisture content as a result of mixing the dried material D, the common inlet 23 has a main shell. In the extending direction of 2, it is preferable to provide at a position slightly closer to the input port 21 than the input port 21, or substantially the same position as the input port 21.

  The carrier air port 24 is a port through which carrier air heated to about 110 ° C. by a heater (not shown) or the like is introduced into the main body shell 2. The exhaust port 25 is a port for discharging the vapor evaporated from the material R to be dried together with the carrier air introduced from the carrier air port 24 to the outside of the main body shell 2. The exhaust path connected to the exhaust port 25 is provided with a dust collector (not shown) and an exhaust fan (not shown), and the vapor and carrier air discharged from the exhaust port 25 are not shown. After being subjected to a predetermined process such as removal of fine powder, the exhaust fan exhausts it to the outside. In the main body shell 2 shown in FIG. 1, since the carrier air port 24 is provided on the inlet side and the exhaust port 25 is provided on the outlet side, the vapor evaporated from the material R to be dried is efficiently discharged from the main body shell 2. can do. The positions of the carrier air port 24 and the exhaust port 25 in the extending direction are not limited to the positions shown in FIG. 1. For example, the carrier air port 24 is provided closer to the discharge port than the input port 21. Also good.

  The multi-tube heating tube 3 is rotatably arranged in the main body shell 2 around the rotation axis along the extending direction, and the rotary shaft portion has a rotary joint at each of both end portions in the extending direction. The shaft member 31 provided with is provided. When this shaft member 31 is rotated by a motor (not shown) or the like, the multi-tube heating tube 3 is rotated. The multi-tube heating tube 3 includes a heating tube bundle 32. The heating tube bundle 32 is a bundle of a plurality of heating tubes 32 a arranged along the shaft member 31 around the shaft member 31. A detailed description of the arrangement of the heating tubes 32a will be described later. A disc-shaped end plate 33 is provided at each of both ends of the heating tube bundle 32 in the extending direction. In FIG. 1, since the discharge side depicts the outer surface of the main body shell, the end plate provided on the discharge port side is hidden by the main body shell 2. Between the pair of end plates 33, a plurality of, for example, equilateral mountain-shaped steels, that is, angles 34, are spanned at predetermined intervals in the rotation direction of the end plate 33. Each of these angles 34 is provided with a plurality of steel plate lifters 341 and feed blades 342 at predetermined intervals in the extending direction. The lifter 341 scrapes up the material R to be dried that stays in the main body shell 2 when the multi-tube heating tube 3 rotates. The feed blade 342 feeds the material to be dried R staying in the main body shell 2 to the discharge port side when the multi-tube heating tube 3 rotates.

  The shaft member 31 is supplied with, for example, saturated steam of about 150 ° C. from the inlet side, and this saturated steam is also supplied from the end plate 33 to each heating pipe 32a, whereby each heating pipe 32a is heated. . Here, since saturated steam is supplied to each heating tube 32a, each heating tube 32a is maintained in a state of being heated to a substantially constant temperature in the extending direction. Further, the drain generated by the condensation of the saturated steam supplied to each heating pipe 32a is accumulated in the end plate on the discharge port side, and this drain is discharged from the main body shell 2 by a siphon type drainage device or the like.

  The distribution mechanism 4 includes a cylindrical body 41 that receives the dry matter D discharged from the discharge port 22 of the main body shell 2, a screw 411 disposed in the cylindrical body 41, an opening / closing device 42 including a cylinder, and the like. And a valve 43. The cylindrical body 41 is arranged in a state of extending in the horizontal direction, and receives the dried product D from one end side portion in the horizontal direction. The received dried product D is sent to the other end side by a screw 411. The cylindrical body 41 is provided with a first discharge port 412 at the other end portion, and a second discharge port 413 is provided at a position closer to one end side than the first discharge port 412. The second discharge port 413 is connected to the transport path 5 via the rotary valve 43, and an opening / closing device 42 is disposed between the second discharge port 413 and the rotary valve 43. The dried product D received by the one end portion of the cylindrical body 41 is partly discharged from the second discharge port 413 while being sent to the other end side by the screw 411, and the remaining dried product D is dried. Is discharged from the first discharge port 412 as the final dried product. Further, the dry matter D discharged from the second discharge port 413 is adjusted to a certain amount by the opening / closing device 42 and supplied to the transport path 5 via the rotary valve 43.

  The transport path 5 includes a mixing nozzle 51 and a transport pipe 52. The mixing nozzle 51 includes a dry material inlet 511 to which the rotary valve 43 is connected, a gas inlet 512, and a discharge outlet 513. A blower 6 as a carrier gas supply means is connected to the gas inlet 512 via a heater 7. The blower 6 applies a predetermined pressure to the taken-out outside air and sends it out. Air pressurized by the blower 6 is sent to the heater 7. The air sent to the heater 7 is heated to about 110 ° C., for example, the same as the carrier air by the heater 7, and this heated air is supplied to the mixing nozzle 51 from the gas inlet 512. In addition, you may make it the aspect which supplies the air previously heated with the heater 7 to the blower 6. FIG. The heater 7 corresponds to an example of a heating unit referred to in the present invention. The transport pipe 52 has one end connected to the discharge port 513 and the other end connected to the common receiving port 23 of the main body shell 2.

  A predetermined amount of dry matter D is supplied to the mixing nozzle 51 from the dry matter input port 511. Further, the dried material D put into the mixing nozzle 51 is discharged from the discharge port 513 by the air supplied from the blower 6, and is transported through the transport pipe 52 to the common receiving port 23. The dried material D that has been conveyed is guided into the main body shell 2 from the common receiving port 23 together with the air supplied from the blower 6. In other words, the air pressurized by the blower 6 corresponds to an example of the carrier gas referred to in the present invention, and hereinafter, this air may be referred to as carrier gas. The transport pipe 52 is usually formed of a steel pipe, but a heat-resistant resin pipe or a rubber hose can be used if wear does not cause a problem.

  Thus, in the dryer 1 of this embodiment, since the dried material D is conveyed with conveyance gas, the restrictions on arrangement | positioning of the conveyance path | route 5 decrease compared with the case where a screw conveyor is used for conveyance of the dried material D. And arrangement | positioning of the conveyance path | route 5 which returns the dried material D to a desired location becomes easy. Furthermore, since the carrier gas introduced into the main body shell 2 is heated by the heater 7, it can function as the carrier air described above. Thereby, the amount of carrier air supplied from the carrier air port 24 can be suppressed. It should be noted that the carrier air supplied from the carrier air port 24 can be eliminated by adjusting the amount of the carrier gas introduced into the main body shell 2, and in this case, the carrier air port 24 is also unnecessary.

  Next, the position where the common receiving port 23 is provided in the rotation direction of the multi-tube heating tube 3 will be described together with the description of the arrangement of the heating tube 32a.

  Fig.2 (a) is a figure which shows typically the cross section of the main body shell shown in FIG. FIG. 2A is a view seen from the direction in which the multitubular heating tube 3 rotates clockwise, as indicated by the thick curved arrow, the rotation direction of the multitubular heating tube 3. In FIG. 2A, the input port 21, the carrier air port 24, the exhaust port 25, the chute 222, and the like other than the common receiving port 23 are omitted in order to simplify the drawing.

  As shown in FIG. 2A, the main body shell 2 is a hollow member having a substantially elliptical cross section. In the heating tube bundle 32 of the multi-tube heating tube 3 disposed in the main body shell 2, a plurality of heating tubes 32a are disposed around the shaft member 31 located in the rotating shaft portion, and the heating tube 32a disposed on the outermost side. The trajectory connecting in the rotation direction is circular. Hereinafter, the circular trajectory connecting the outermost heating tube 32a in the rotation direction will be referred to as a reference circle, and the location of the multi-tube heating tube 3 will be described at the position indicated by the short hand of the watch with respect to the reference circle. is there. Although shown in a simplified manner in FIG. 2A, a large number of heating tubes 32a are also arranged at predetermined intervals inside the heating tube 32a arranged on the outermost side.

  In FIG. 2A, a solid line indicates a state in which an object to be dried R having a general filling rate of about 50% stays in the main body shell 2. The to-be-dried object R staying in the main body shell 2 is scraped up by the lifter 341 attached to the angle 34 as the multi-tube heating tube 3 rotates. By repeating the scraping by the lifter 341, the material to be dried R staying in the main body shell 2 is accumulated in a state of gradually increasing from the right side to the left side in FIG. Specifically, the to-be-dried object R staying in the main body shell 2 is accumulated in the range from the 4 o'clock position to the 10 o'clock position in the reference circle. In the present embodiment, the common receiving port 23 is provided toward the location at the 10:30 position in the reference circle. As a result, the dried material D is blown into the main body shell 2 together with the carrier gas from the common receiving port 23, and the dried material D together with the carrier gas is generated in the bridge B of the material to be dried, which is generated above the staying material R to be dried. (See thin straight arrows). As a result, the bridge B of the material to be dried can be broken down efficiently. Here, the common receiving port 23 is preferably provided toward a predetermined position within a range from the 9 o'clock position to the 3 o'clock position in the reference circle when viewed clockwise (see the semicircular double-headed arrow). ). Even in the case where the amount of the material to be dried R staying in the main body shell 2 is small, as shown by the alternate long and short dash line, the main body shell 2 has a position from about 5 o'clock to 9 o'clock in the reference circle. The object to be dried R ′ is accumulated in the range of the position. For this reason, even if the common receiving port 23 is provided at a position in the counterclockwise direction with respect to the 9 o'clock position in the reference circle, the common receiving port 23 is blocked by the staying dry matter R ′. It is difficult to guide the dried material D into the main body shell 2. On the other hand, even if the common receiving port 23 is provided toward a location within the range from the 3 o'clock position in the reference circle to the to-be-dried objects R and R ′, and the bridge of the to-be-dried object is broken, The to-be-dried material R which has collapsed falls on the staying to-be-dried materials R and R ′ almost without contacting the heating tube 32a. For this reason, the effect which breaks the bridge | bridging of a to-be-dried material is small.

  Next, the drying process using the dryer 1 of this embodiment is demonstrated using FIG. 1 and FIG. 2 (a).

  First, the exhaust fan and the dust collector are activated, and then the multi-tube heating tube 3 is rotated to supply saturated steam of, for example, about 150 ° C. to the shaft member 31. The saturated steam supplied to the shaft member 31 is also supplied from the end-side end plate 33 to each heating tube 32a, whereby each heating tube 32a is heated. Next, an object to be dried R such as sludge is introduced into the main body shell 2 from the inlet 21. Further, for example, carrier air heated to about 110 ° C. is introduced into the main body shell from the carrier air port 24. The to-be-dried object R is stirred by being swung up and dropped by the lifter 341 by the rotation of the multi-tube heating tube 3, and receives heat by contacting the heating tube 32a. While the object to be dried R stays in the main body shell 2, the contact with the heating tube 32 a and the stirring are repeated, so that the moisture content is gradually lowered and dried. D is discharged. In addition, the to-be-dried object R staying in the main body shell 2 is subjected to the piston action by the introduction of the to-be-dried object R from the inlet 21 and the discharge of the dried substance D from the outlet 22, and the rotating multi-tube heating. The tube 3 gradually moves toward the discharge port by the action of the feed blade 342 of the tube 3. Moreover, the vapor | steam evaporated from the to-be-dried object R is discharged | emitted from the exhaust port 25 with carrier air.

  The dried material D discharged from the discharge port 22 is received by the cylindrical body 41 of the distribution mechanism 4, a part of which is discharged from the second discharge port 413, and the rest is discharged from the first discharge port 412. . The dried material D discharged from the first discharge port 412 completes the drying process of the dryer 1. The dried material D discharged from the second discharge port 413 is adjusted to a constant amount by the opening / closing device 42 and is supplied from the rotary valve 43 to the mixing nozzle 51. The dried material D introduced into the mixing nozzle 51 is pressurized by the blower 6 and is heated by the heater 7 to, for example, about 110 ° C., for example, from the discharge port 513 of the mixing nozzle 51 to the inside of the conveying pipe 52 through the common receiving port. 23 is conveyed. The dried material D transported to the common receiving port 23 is blown from the common receiving port 23 together with the transported gas. When the dry matter D is mixed, the moisture content of the material to be dried R staying in the vicinity of the charging port 21 is reduced, and even in the vicinity of the charging port 21 where bridging is likely to occur, the multi-tube heating tube 3 has a bridge. It can suppress that it arises. As a result, the to-be-dried material R scraped up by the lifter 341 enters the inside of the heating tube bundle 32, and the to-be-dried material R also comes into contact with the heating tube 32a disposed inside the heating tube bundle 32, thereby drying performance. Can be prevented. Furthermore, since the common receiving port 23 is provided slightly on the inlet side from the inlet 21, the dry matter R having the highest moisture content introduced from the inlet 21 is mixed with the dried matter D. Thus, it is mixed as it is with the material R to be dried whose water content is reduced. Thereby, it can prevent that the to-be-dried object R stays in the main body shell 2 in the state with the highest moisture content. However, there is still a case where a bridge B of the object to be dried occurs in the vicinity of the charging port 21 and the heating tube 32a and the object to be processed are not sufficiently contacted. As shown to Fig.2 (a), in this embodiment, this bridge | bridging B can be destroyed by striking the dried material D against the bridge | bridging B with carrier gas. Accordingly, the to-be-dried object R is received by the collapsed object to be dried R reaching the heating tube 32a located inside the heating tube bundle 32, and drying can be promoted.

  Next, a modification of the dryer shown in FIGS. 1 and 2 (a) will be described. In the modified example described below, differences from the embodiment shown in FIGS. 1 and 2A will be mainly described, and the names of the components in the embodiment shown in FIGS. 1 and 2A are the same. The components of the name will be described with the reference numerals used so far, and redundant description may be omitted.

  FIG.2 (b) is a figure which shows the aspect corresponding to Fig.2 (a) in the modification of the dryer shown in FIG.1 and FIG.2 (a). This modification is different from the main body shell 2 shown in FIGS. 1 and 2A mainly in that a plurality of common receiving ports 23 are provided in the main body shell 2.

  As shown in FIG. 2 (b), the main body shell 2 of the present modification is provided toward a predetermined location within the range of the 9 o'clock position to the 3 o'clock position in the reference circle when viewed clockwise. A plurality of common receiving ports 23 are provided at predetermined intervals in the rotation direction of the multi-tube heating tube 3. A damper 231 is disposed at the entrance of each of the plurality of common receiving ports 23. Further, each common receiving port 23 is connected to a branched transfer pipe 521 branched from the transfer pipe 52 shown in FIG. A branch valve (not shown) is provided at a branch portion of the branch transport pipe 521. The dried product D that has been transported in the transport pipe 52 by the transport gas is distributed to each branch transport pipe 521 by the branch valve. The amount of the dried material D and the carrier gas distributed to each branch conveyance pipe 521 is adjusted by the respective dampers 231 and blown into the main body shell 2 from the respective common receiving ports 23.

  According to the dryer 1 of this modified example, each common receiving port depends on the physical properties and moisture content of the material to be dried R to be charged, the amount of the material to be dried R staying in the main body shell 2, and the like. The amount of dry matter D and carrier gas blown from 23 can be adjusted. As a result, the bridge can be broken down more efficiently, and the dry matter D can be mixed with the dry matter R. For example, when the object to be dried R staying in the main body shell 2 is accumulated up to the position of about 10 o'clock in the reference circle (see the object to be dried R indicated by the solid line), it is about 10:30 in the reference circle. Compared to the other common receiving ports 23, a larger amount of dry matter D and carrier gas are blown from the common receiving port 23 provided toward the position of the position. As a result, the bridge B can be broken immediately after the bridge B is generated. In addition, it is only necessary to block the blow of the dried material D and the carrier gas from the common receiving port 23 provided toward the 9 o'clock position in the reference circle. On the other hand, when the object to be dried R staying in the main body shell 2 has accumulated only up to the 9 o'clock position in the reference circle (see the object to be dried R ′ indicated by a one-dot chain line), What is necessary is just to blow in a large amount of dry matter D and carrier gas compared with the other common receiving port 23 from the common receiving port 23 provided toward the location of the time position. Alternatively, several common receiving ports 23 may be selected from the plurality of common receiving ports 23, and the dried material D and the carrier gas may be blown from only the selected common receiving ports 23.

  According to the dryer 1 demonstrated above, arrangement | positioning of the conveyance path | route which returns a dried material to a desired location becomes easy, accepts not only a dried material but the heated conveyance gas in a dryer, and uses it actively for drying. can do.

  Next, the dryer which is 2nd Embodiment of this invention is demonstrated. In the following description, differences from the dryer 1 of the first embodiment shown in FIG. 1 and FIG. 2 (a) will be mainly described, and the components having the same names as the names of the components described so far will be described. Are described with reference numerals used so far, and redundant description may be omitted.

  FIG. 3A is a block diagram showing a part extracted from the main body shell in the dryer according to the second embodiment. In the dryer 10 of the second embodiment, a part of the dry matter D discharged from the discharge port 22 of the main body shell 2 is distributed as in the dryer 1 of the first embodiment shown in FIG. The dried material D distributed by the mechanism is transferred to the main body shell 2 side through the transfer pipe 52 by the transfer gas.

  As shown in FIG. 3A, the transport path 5 in the dryer 10 according to the second embodiment includes a separator 53 at the downstream end portion of the transport pipe 52. The separator 53 is, for example, a cyclone, and separates the dried material D that has been conveyed by the carrier gas from the carrier gas. In the upper part of the separator 53, a separator receiving port 531 is formed which receives the dried product D transported through the transport pipe 52 together with the transport gas. A second rotary valve 532 is provided at the lower end portion of the separator 53. In the main body shell 2, instead of the common receiving port 23 in the dryer 1 of the first embodiment shown in FIG. 1, a dried material receiving port 26 and a carrier gas receiving port 27 are separately provided. The dry matter inlet 26 is connected to the second rotary valve 532 of the separator 53, and the carrier gas inlet 27 is connected to an air supply pipe 533 extending from the upper end portion of the separator 53.

  The dried product D that has been transported through the transport pipe 52 is received in the separator 53 together with the transported gas from the separator receiving port 531, and the dried product D and the transported gas are separated in the separator 53. The separated dried product D falls from the second rotary valve 532 and is guided into the main body shell 2 from the dried product receiving port 26. The separated carrier gas is sent to the carrier gas inlet 27 through the air supply pipe 533, and the carrier gas is blown into the main body shell 2 from the carrier gas inlet 27.

  Next, the positions of the dry matter inlet 26 and the carrier gas inlet 27 in the rotation direction of the multi-tube heating pipe 3 will be described.

  FIG. 3B is a diagram schematically showing a transverse section of the main body shell shown in FIG. FIG. 3B is also a view seen from the direction in which the multitubular heating tube 3 rotates clockwise, as indicated by the thick curved arrow, the rotation direction of the multitubular heating tube 3. In FIG. 3B, the inlet 21, the carrier air port 24, the exhaust port 25, the chute 222, and the like are omitted to simplify the drawing. Further, a solid line indicates a state in which an object to be dried R having a general filling rate of about 50% is retained in the main body shell 2.

  As shown in FIG. 3B, when viewed clockwise, the dry matter receiving port 26 is provided toward a position slightly before 12 o'clock in the reference circle. As a result, the dried product D received from the dried product receiving port 26 falls to a location just before 12 o'clock of the multi-tube heating tube 3 in the reference circle. The fallen dry matter D is mixed with the dry matter R scraped up by the lifter 341, and the dry matter D can be efficiently mixed with the dry matter R.

  Further, in the second embodiment, two carrier gas inlets 27 are provided, one of the air supply pipes 533 connected to the separator 53 is branched, and each of the other branched ends of the gas supply pipe 533 is divided into two carriers. Each is connected to a gas inlet 27. One carrier gas receiving port 27 is provided toward a location at a 10:30 position in the reference circle. As a result, the carrier gas can be blown into the main body shell 2 from the one carrier gas inlet 27, and the carrier gas can be blown to the bridge B generated above the staying object R, and the bridge B can be destroyed. become. Here, the carrier gas blown from the carrier gas inlet 27 has less action of breaking the bridge B than the dry substance D and carrier gas blown from the common inlet 23 shown in FIG. Since D does not hit the heating tube 32a or the like, the heating tube 32a or the like is not worn. Further, the other carrier gas inlet 27 is provided toward the position of the 7:30 position in the reference circle. As a result, the carrier gas is blown from the other carrier gas inlet 27 toward the object to be dried R staying in the main body shell 2, and the vapor evaporated from the object to be dried R in the staying state is positively exhausted. Can be transported.

  Here, when viewed clockwise, the carrier gas inlet 27 is preferably provided toward a predetermined location within a range from the 3:30 position to the 12 o'clock position in the reference circle (FIG. 3B). Arc-shaped double-headed arrow in). The to-be-dried object R staying in the main body shell 2 may be accumulated in the range from the 3:30 position to the 10:30 position in the reference circle when the filling amount is large ( (Refer to dry matter R '' indicated by a one-dot chain line). In this state, when viewed in the clockwise direction, the carrier gas inlet 27 is provided toward the location within the range of the 3:30 position from the 12 o'clock position in the reference circle, and the bridge generated in this portion is broken. It is also possible, however, by providing the carrier gas inlet 27 from the 3:30 position to the 10:30 position in the reference circle, the steam in the object to be dried R ″ is positively transferred by the carrier gas. Therefore, the effect of transferring to the exhaust side is produced, and the drying of the staying dry matter R ″ is promoted. The dried object R ″ whose drying has been accelerated and the dried object R to be fed are mixed, and an effect of preventing the occurrence of bridging is exhibited. In addition, in the main body shell 2 shown in FIG. 3B, two carrier gas inlets 27 are provided, but only one carrier gas inlet 27 may be provided, and three or more carrier gases may be provided. It is good also as an aspect which provides the receiving port 27. FIG.

  Next, a modified example of the dryer 10 according to the second embodiment shown in FIGS. 3A and 3B will be described.

  Fig.4 (a) is a figure which shows the aspect corresponding to FIG.3 (b) in the 1st modification of the dryer shown to Fig.3 (a) and the same figure (b), FIG.4 (b) is shown. FIG. 4 is a view showing an aspect corresponding to FIG. 3B in the second modified example of the dryer shown in FIG. 3A and FIG. The first modification and the second modification are mainly different from the dryer 10 shown in FIGS. 3A and 3B in the cross-sectional shape of the main body shell 2 and the position of the heater for heating the carrier gas. To do.

  As shown in FIG. 4A, in the first modification, the cross-sectional shape of the main body shell 2 is formed in a substantially circular shape. Further, in place of the heater 7 disposed between the blower 6 and the mixing nozzle 51 shown in FIG. 1, a second heater 71 is provided on the downstream side of the transport pipe 52. The second heater 71 heats the carrier gas and the dried material D flowing through the carrier tube 52, and the heated carrier gas and the dried material D are supplied to the separator 53. Thus, as compared with the case where the heated carrier gas is supplied to the carrier path 5 as in the dryer 10 shown in FIGS. 3A and 3B, the main body shell 2 is heated after the carrier gas is heated. The time until it is guided to the inside is shortened, and the temperature drop of the carrier gas can be suppressed. In the first modified example, when viewed in the clockwise direction, only the carrier gas inlet 27 directed toward the 7:30 position in the reference circle is provided, and the dry matter inlet 26 is provided in the reference circle. It is provided toward the location at the 1:30 position.

  As shown in FIG. 4B, in the second modification, the main body shell 2 includes a substantially U-shaped portion and a planar portion that closes the upper end portion of the U-shaped portion. It has a cross-sectional shape. A third heater 72 that heats the carrier gas is provided in the air supply pipe 533. Thus, after the dried product D and the carrier gas are separated by the separator 53, only the carrier gas is heated, and the heated carrier gas is blown into the main body shell 2 from the carrier gas inlet 27. As described above, in the second modification, the carrier gas is heated after being separated from the dry matter D, and therefore, the time from when the carrier gas is heated to being guided into the main body shell 2 is determined from the first modification. Can be further shortened. Moreover, since it is only necessary to heat the carrier gas, the heating output of the third heater 72 can be suppressed as compared with the first modified example in which the dried material D is heated together with the carrier gas.

  The dryer 10 of the second embodiment described above also facilitates the arrangement of the conveyance path for returning the dried product to a desired location, and accepts not only the dried product but also the heated carrier gas into the dryer, and actively It can be used for drying.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. For example, a plurality of common receiving ports 23 shown in FIG. 2B and a carrier gas receiving port 27 shown in FIGS. 3B and 4B are provided in the rotation direction of the multi-tube heating tube 3. In addition to these, a plurality of common receiving ports 23 and carrier gas receiving ports 27 may be provided also in the extending direction of the main body shell 2. Further, a plurality of dry matter receiving ports 26 may be provided in the rotating direction of the multi-tubular heating tube 3, or a plurality of dried material receiving ports 26 may be provided in the extending direction of the main body shell 2. Furthermore, the shape of the main body shell 2 is not limited to those of the above-described embodiments and modifications. If the lower portion has an arcuate cross-sectional shape, the upper portion has an appropriate cross-sectional shape. Can be adopted.

  Furthermore, during the drying operation by the dryer 1, not only the operation of conveying the dried material D to the main body shell 2 by the conveyance path 5 is performed at the same time, but, for example, it is detected that a bridge has occurred during the drying operation. After that, it is also possible to perform an operation for transporting the dried material D through the transport path 5. The detection that the bridge has occurred is based on the driving current value of a motor (not shown) for rotating the multi-tube heating tube 3 or the amount of drain discharged from the heating tube 32a to the outside of the dryer 1. It can be carried out.

  Furthermore, the amount of change in the motor drive current described above per unit time or the amount of change in drain discharge per unit time is detected, and based on this, the amount of dry matter D transported using the transport path 5 is determined. It is also possible to use control for increasing / decreasing the amount of carrier gas by the blower 6 together. According to these, the dried product D is not transported to the main body shell 2 more than necessary, and the final dried product can be efficiently obtained from the second discharge port 413.

  In addition, even if it is a structural requirement contained only in each description of embodiment and the modification demonstrated above, you may apply the structural requirement to another embodiment and a modification.

DESCRIPTION OF SYMBOLS 1 Dryer 2 Main body shell 21 Input port 22 Discharge port 23 Common reception port 24 Carrier air port 25 Exhaust port 26 Dry matter reception port 27 Carrier gas reception port 3 Multi-tube heating tube 32 Heating bundle 341 Lifter 4 Distribution mechanism 5 Transfer Route 6 Blower 7 Heater B Bridge D Dried material R Dried material

Claims (5)

Drying to dry the material to be dried by bringing the material to be dried charged into the main body shell from the charging port into contact with a multi-tube heating tube rotating in the main body shell, and discharging the dried material from the inside of the main body shell. In the machine
A transport path serving as a path when the dry matter discharged from within the main body shell is transported by the transport gas to the input port side;
Heating means for heating the carrier gas,
The main body shell receives a heated carrier gas and a dried material that has been conveyed. The main body shell is provided with a common receiving port to which the transport path is connected on the inlet side,
2. The dryer according to claim 1, wherein the common receiving port guides the dried material conveyed by the carrier gas into the main body shell together with the carrier gas. The multi-tube heating tube has a circular trajectory in which a plurality of heating tubes are arranged along the rotation axis around the rotation axis, and the heating tube arranged on the outermost side is connected in the rotation direction,
When the multi-tube heating tube that rotates clockwise is viewed clockwise, the common receiving port faces the main body toward a predetermined position within a range of 9 o'clock to 3 o'clock in the circle. The dryer according to claim 2, wherein the dryer is provided in a shell. The transport path includes a separating unit that separates the transport gas and a dried product transported by the transport gas.
The said main body shell is provided with a dry matter receiving port for receiving the dry matter and a carrier gas receiving port for receiving a carrier gas separated by the separating means, respectively. Dryer. The multi-tube heating tube has a circular trajectory in which a plurality of heating tubes are arranged along the rotation axis around the rotation axis, and the heating tube arranged on the outermost side is connected in the rotation direction,
When the multi-tube heating tube that rotates clockwise is viewed in the clockwise direction, the carrier gas receiving port is directed toward a predetermined location within a range of 3:30 to 12 o'clock in the circle, The dryer according to claim 4, wherein the dryer is provided in the main body shell.