JP2019202270A - Auxiliary blade structure of stirring-type drying device comprising cracking function - Google Patents

Abstract

To provide an auxiliary blade structure of a stirring-type drying device comprising a cracking function in which an auxiliary blade is configured so as not to fall off even if drying sludge-like raw materials which contain metal such as copper, have high moisture content, have a large bulk density and have a small particle size.SOLUTION: In a stirring-type drying device that heats and dries a processed material, tension strength of a bolt 13 for fixing an auxiliary blade 20 (auxiliary blade pieces 20a) to be mounted on some stirring blades (4-44-4and the like) positioned at an input port side for the processed material is set to be relatively stronger than a bolt mounted on the other stirring blade 4. This can prevent the auxiliary blade 20 (the auxiliary blade pieces 20a) from falling off, so that facility operation rate can be enhanced.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an auxiliary blade structure attached to a stirring blade of a stirring-type drying apparatus having a crushing function, and more specifically, includes copper and the like, has a high moisture content, a large bulk specific gravity, and a small particle diameter. The present invention relates to an auxiliary blade structure of a stirring-type drying apparatus having a crushing function that does not cause dropping of an auxiliary blade attached to a stirring blade even when a sludge-like workpiece is dried.

  Since sewage sludge, human waste sludge, activated sludge, etc. have a large amount of water and become a problem in resource recycling and disposal, they are dried to reduce and recycle resources. In addition, thinning (= forest residual material) that has been thinned for forest conservation has a high water content and cannot be used as biomass fuel. Therefore, drying is performed after making a wood chip (wood chip). For drying such sludge and wood chips, for example, a band dryer, a band fluidized dryer, a box-type dryer, an octopus rotary dryer, a wedge-type dryer (also referred to as a “dryer with a stirring blade”), and the like. The dryer is used.

  Among various types of dryers, the wedge-type dryer includes a wedge-type stirring blade (hereinafter simply referred to as “stirring blade”) that is a plurality of wedge-shaped rotary blades. Conductive heat transfer type dryer (conductive heat transfer type drying) that supplies heat medium such as hot water and oil and also supplies heat medium such as steam, hot water, and oil into the jacket of the dryer body. The processed product is dried by heat conduction from the rotating blades and the jacket. This wedge style dryer has 1: high thermal efficiency and high heat transfer coefficient, 2: large heat transfer area, small installation area, 3: low odor gas due to low air volume, 4: continuous processing Possible: 5: High stirring efficiency and few deposits, 6: Low running cost. In addition, there exists patent document 1, 2 regarding a conductive heat-transfer type drying apparatus, for example.

  The dryer shown in Patent Document 1 has two rotating shafts that rotate in opposite directions inside the casing in parallel to the longitudinal direction, and a plurality of stirring blades are attached to each rotating shaft at predetermined intervals, and The stirrer blades of the other rotating shaft are inserted between the stirrer blades of one rotary shaft so that each stirrer blade is arranged in a zigzag shape. Auxiliary blades to be used as feed blades and return blades are attached, and the appearance positions at the apexes of the auxiliary blades to be used as feed blades and return blades are sequentially shifted in phase in the longitudinal direction in the same rotational direction of each rotating shaft so that the adjacent ones are at acute angles. It is the arrangement | positioning. By attaching the auxiliary wing, drying is promoted by finely crushing the workpiece.

JP 2014-9876 A

  The present inventors use a wedge-style drier having the configuration shown in Patent Document 1, contains a metal such as copper, has a high moisture content, and has a high bulk specific gravity to dry a sludge-like workpiece. As a result, there were frequent cases where the mounting bolts of the auxiliary wings broke and the auxiliary wings dropped out within a short period of time, and each time the operation was forced to stop. Specifically, the wings dropped out with a frequency of several days to several weeks. If the auxiliary wings fall off, it is necessary to stop the operation for about 24 hours, cool the drying device, insert a vacuum hose, and suck the auxiliary wings into the drying device to collect them. The time utilization rate will drop significantly due to the suspension of operations. In such models, all SUS316L: M12 bolts have been used as bolts for fixing the auxiliary wings. However, if the workpiece is, for example, sludge, wood chips, paper sludge, etc., the auxiliary wings are dropped. This problem has not been confirmed. However, when the object to be treated is copper-containing sludge having a high moisture content and a high bulk specific gravity, the load on the auxiliary wing becomes large, and the above-mentioned problems occur, and countermeasures are urgently required.

  Therefore, the present invention has been made in view of such problems, even when a sludge-like raw material containing a metal such as copper, having a high moisture content, a large bulk specific gravity, and a small particle diameter is dried. An object of the present invention is to provide an auxiliary blade structure of a stirring-type drying apparatus having a crushing function capable of continuing a stable operation without causing the auxiliary blade to drop off.

  In order to solve the above problems, the present invention according to claim 1 is arranged such that at least two rotating shafts arranged in parallel to each other are arranged to be rotatable in opposite directions to each other, and the rotating shaft has a predetermined interval. A plurality of stirring blades are disposed, and the stirring blades attached to the rotating shaft on one side and the stirring blades attached to the other side are alternately arranged. It has a pair of slit portions that are disk-shaped and part of the opposing positions cut out in a substantially V shape, and an auxiliary wing that crushes the object to be processed at the circumferential end of the slit portion. In an agitation-type drying apparatus that is attached and formed, and heats and dries a workpiece by supplying a heated heat medium to a jacket and the agitation blade, at least to the agitation blade located on the discharge port side of the object to be treated Fix the auxiliary wing It is characterized in that the tensile strength of the bolt for fixing the auxiliary blade to a predetermined stirring blade located on the inlet side relative to the tensile strength of the bolt is relatively increased.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the stirring-type drying apparatus according to claim 1, wherein the stirring blades arranged on one rotating shaft are within half the number from the inlet side. The tensile strength of the bolt for fixing the auxiliary blade to the predetermined stirring blade is relatively increased.

  In order to solve the above-mentioned problem, the present invention as set forth in claim 3 is characterized in that, in the stirring type drying apparatus according to claim 1 or 2, the relatively strong tensile strength of the bolt is 75,000 N or more. And

  In order to solve the above-mentioned problem, the present invention according to claim 4 is the stirring-type drying device according to any one of claims 1 to 3, wherein the bolt having high tensile strength is made of Cr-Mo steel. It is characterized by.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is the stirring-type drying apparatus according to any one of claims 1 to 4, wherein the bolt having high tensile strength is M16 (SUS316L). Features.

  In order to solve the above-mentioned problem, the present invention according to claim 6 is arranged such that at least two rotating shafts arranged in parallel to each other are rotatably arranged in opposite directions, and the rotating shaft has a predetermined interval. A plurality of stirring blades are disposed, and the stirring blades attached to the rotating shaft on one side and the stirring blades attached to the other side are alternately arranged. It has a pair of slit portions that are disk-shaped and part of the opposing positions cut out in a substantially V shape, and an auxiliary wing that crushes the object to be processed at the circumferential end of the slit portion. In a method for drying an object to be processed using an agitation-type drying apparatus that is heated and dried by supplying a heating medium heated to the jacket and the stirring blade, the moisture content is 30 to 70. % By mass, copper grade 5-5 A bolt for fixing the auxiliary blade to the stirring blade positioned at least on the discharge port side of the object to be processed, which has 0% by mass, a bulk specific gravity of 1.2 to 2.0, and a particle diameter of 1 to 100 μm. It is characterized in that drying is carried out with a relatively high tensile strength of a bolt for fixing the auxiliary blade to a predetermined stirring blade positioned closer to the inlet than the tensile strength of the steel.

  In order to solve the above-mentioned problem, the present invention according to claim 7 is the method for drying an object to be processed according to claim 6, wherein the object to be processed is less than 1/3 of the rated value from the inlet of the stirring and drying apparatus. A charging step of charging at a charging speed, and a height position of the object being dried in the stirring-type drying apparatus until the height of 80% or more of the length from the rotation center to the upper end of the stirring blade is hidden. A semi-drying process for performing semi-drying, and the semi-dried object to be processed is stored in the stirring and drying apparatus to a height at which the stirring blades are hidden, and the processed object is charged at 80 to 100% of the rated value. And a drying step in which drying is performed at a speed.

  According to the auxiliary blade structure of the stirring-type drying apparatus having a crushing function according to the present invention, a sludge-like material containing a metal such as copper, having a high moisture content, a large bulk specific gravity, and a small particle diameter. Even when the workpiece is dried, there is an effect that the auxiliary blade does not fall off and continuous operation is possible. Therefore, there is an effect that the equipment operation rate is improved as compared with the conventional case.

  Moreover, according to the drying method of the to-be-processed object which concerns on this invention, a water content is 30-70 mass%, a copper grade is 5-50 mass%, bulk specific gravity 1.2-2.0, and a particle diameter is 1-100 micrometers. Thus, there is an effect that the object to be treated can be efficiently and stably dried for a long period of time without dropping off the auxiliary blades.

It is a top view which shows one Embodiment of the stirring type drying apparatus which concerns on this invention. It is BB sectional drawing of the drying apparatus shown in FIG. It is a side view of a stirring blade. It is an enlarged view which shows the detail of the A section shown in FIG. It is a figure explaining the detail of the blade piece of a stirring blade. It is explanatory drawing which shows each attachment angle of the blade piece to the 2nd rotating shaft from the entrance side to the 5th sheet. The detailed structure of an auxiliary wing is shown, (a) is a perspective view, (b) is a top view, (c) is a side view. The detail of the auxiliary wing piece which comprises an auxiliary wing is shown, (a) is a front view, (b) is a top view, (c) is a side view. It is a flowchart which shows one Embodiment of the drying method of the to-be-processed object which concerns on this invention.

[Composition of stirring type drying device and auxiliary blade structure]
Hereinafter, the auxiliary blade structure of the stirring-type drying apparatus provided with the crushing function according to the present invention will be described in detail based on a preferred embodiment. First, the structure of the stirring type drying apparatus will be described. FIG. 1 is a plan view showing an embodiment of an agitation type drying apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along the line BB of the agitation blade shown in FIG. 1, and FIG.

A stirring-type drying apparatus (hereinafter simply referred to as “drying apparatus”) 1 having a crushing function generally includes a horizontally long jacket (or casing) 2 and an inside of the jacket 2. Rotary shafts 3a and 3b arranged in parallel, a plurality of stirring blades (wedges) 4 _-1 to _4-45 attached to the rotary shafts 3a and 3b at predetermined intervals, and the rotary shafts 3a and 3b. Drive mechanism 5a, 5b, a weir plate 6 disposed on the inner side of the rear end (right end in FIG. 1) of the jacket 2, and a support member 7 for supporting the jacket 2. Yes.

Jacket 2 is for example made of metal, as shown in FIG. 3, section in line with the shape of the lower side agitating blade ₄ -1 _{to 4 -22} and stirring blade ₄ -23 _{-4 -45} has an arcuate While being formed in a substantially W shape, the inside is made into the sealing structure. As shown in FIG. 2, a workpiece inlet 2 a is provided at the upper portion of one end side (left side in FIG. 2) of the jacket 2, and a weir plate 6 is provided on the other end side (right side in FIG. 2). At the same time, a discharge port 2 e is provided on the top of the barrier plate 6. The upper height position of the weir plate 6 is higher than the height position of the stirring blade 4. Thereby, the semi-dried object to be treated is held in the jacket 2 until the upper part of all the stirring blades _4-1 to _4-45 is hidden at the beginning of the operation, so that the material is charged from the charging port 2a. The new object to be treated is prevented from coming into direct contact with the surface of the stirring blade 4 to prevent the casting from growing on the surface of the stirring blade 4. The upper height position of the weir plate 6 is 80% or more of the length from the rotation center to the upper end of the stirring blades _4-1 to _4-45 , preferably 95% or more, and more preferably If the height that can be filled up to the height of the upper end can be secured, it is possible to prevent the growth of the surface of the stirring blade 4 from casting. Further, the jacket 2 has a double structure, and a plurality of heating steam supply ports 2f and 2f are provided on both side surfaces of the jacket 2, and the heating steam is supplied from the heating steam supply ports 2f and 2f into the cavity of the jacket 2. To heat the drying of the object to be processed in the jacket 2. A plurality (three in FIG. 2) of drain discharge ports 2c and 2c are attached to the bottom of the jacket 2, and the drain after the heating steam supplied from the heating steam supply ports 2f and 2f is cooled is removed. It is designed to drain. Further, a heating air supply port 2b is provided in the vicinity of the discharge port 2e, and heating air introduced into the jacket 2 and steam generated when drying the object to be processed are disposed at an intermediate position on the jacket 2. An exhaust duct 2d (see FIG. 2) for leading to a dust collector (not shown) is connected. The exhaust duct 2d and a dust collector (not shown) are connected by a conduit (not shown), and a so-called steam trace is provided at least before the dust collector and in the dust collector. This is to prevent the inside of the drying device and a dust collector (not shown) from condensing due to the steam generated when the workpiece is dried. Note that the steam trace can be provided at least before the dust collector of the conduit or on either the dust collector. Steam trace prevents the temperature in the dust collector (not shown) from dropping below the dew point temperature. This is because when the temperature in the dust collector becomes equal to or lower than the dew point, the filter cloth of the dust collector becomes wet due to dew condensation, and the pressure loss due to the filter cloth rises rapidly and the operation becomes impossible.

The rotary shafts 3a and 3b are formed in a hollow shape so that heating steam (for example, heating steam of 0.5 to 0.6 MPa) can be introduced into the rotation shafts via the steam supply ports 2g and 2g. The heating steam introduced into the rotary shafts 3a and 3b is further introduced into the stirring blades _4-1 to _4-45 as will be described later. The workpiece is dried by contacting the workpieces with the rotating shafts 3a and 3b and the stirring blades _4-1 to _4-45 heated by the heating steam. The steam supply ports 2g and 2g are formed by rotary joints having a plurality of flow paths therein, and the heated steam introduced into the rotating shafts 3a and 3b and the stirring blades 4 _-1 to _4-45 is heated. The water generated by the exchange is drained again through the steam supply ports 2g and 2g. The dried object to be processed is discharged so as to overflow from a discharge port 2e provided at the upper portion of the dam plate 6, and is sealed through a discharge chute 2h (see FIG. 2), for example, a flow conveyor. It is comprised so that it may be carried out by. The reason for this is that when the particle size of the crushed and dried product is as fine as 1 to 100 μm, the dried product scatters or the amount of ore falling is extremely high when transported by an open conveyor such as a belt conveyor. This is because a conveyance failure may occur.

The rotary shafts 3a and 3b are pivotally supported at both ends by bearings. As shown in FIG. 6, the rotating shaft 3a rotates in the clockwise direction, and the rotating shaft 3b rotates in the counterclockwise direction. That is, the rotating shafts 3a and 3b are driven to rotate in opposite directions and at the same speed by the driving mechanisms 5a and 5b. As shown in FIG. 1, in this embodiment, the stirring blades 4 _-1 to _4-45 attached to the respective rotary shafts 3a and 3b and arranged in two rows have 22 rotary shafts 3a (4 _-1). ˜4 ₋₂₂ ), and the rotating shaft 3 b side is 23 (4 ₋₂₃ to _4-45 ). When viewed from the plane direction, the stirring blades _4-1 to _4-22 and the stirring blades _4-23 to _4-45 are arranged so as to partially overlap each other alternately at the center side of the jacket 2.

The stirring blades 4 _-1 to 4 _-45 have the same shape, and a pair of blade pieces 4 a and 4 b and blade pieces 4 c and 4 d formed in a disk shape by notches 8 and 8 in two portions of the disk shape. It is formed with. The wing pieces 4a to 4d have a hollow structure inside, and the heating steam introduced into the rotary shafts 3a and 3b is introduced into the inside and heated. Further, as shown in FIG. 5, the blade pieces 4a to 4d have a tapered shape in which the end portion on the rotation direction side is thick and the end portion on the opposite side in the rotation direction is thin to increase the crushing and stirring power of the workpiece. It can be shaped. Further, as shown in FIG. 3, the stirring blades 4 _-1 to _4-22 are arranged so that two blade pieces 4a and 4b are opposed to each other on the same circumference on the rotating shaft 3a side. _{Each of the} blades _4-23 to _4-45 has a configuration in which two blade pieces 4c and 4d are arranged opposite to each other on the same circumference on the rotating shaft 3b side. The wing 4a~4d impellers 4 _-1 to 4 _-45 to different positions so that the position provided with the cutout portion 8 does not overlap the predetermined number as viewed from the axial direction (four in this embodiment) Has been placed.

  An auxiliary wing 20 is attached to the outer edge portion forming the notch portion 8. The auxiliary blade 20 crushes the processed material so that the dried product does not harden, and sends the processed material to the outlet side or returns it to the inlet side to hold the processed material in the jacket 2 for a predetermined time. And provided to promote drying. Details of the auxiliary blade 20 will be described later.

In the case of this embodiment, the attachment angles of the blade pieces 4a to 4d to the rotary shafts 3a and 3b are as shown in FIG. Until 5 th of the stirring blade ₄ -1 _{to 4 -5} to the rotary shaft 3a in FIG. 6, and, for each wing 4a~4d to 5th stirring blade ₄ -23 _{-4 -27} to the rotary shaft 3b The mounting angle is shown. Then, in the rotary shaft 3a side, stirring blade ₄ -1 15 ° from _{-4 -4} wing 4a~4d horizontal position (9 o'clock) the counterclockwise direction, 60 °, 105 °, that 150 ° shifting the angle attached to, stirring blade ₄ -5 _{to 4 -22} is the repetition of the attachment of the stirring blade ₄ -1 _{to 4 -4.} On the rotating shaft 3b side, the blade pieces 4c and 4d of the stirring blades _4-23 to _4-26 are shifted in the clockwise direction from the 12 o'clock position to 15 °, 60 °, 105 °, and 150 °. The agitating blades _4-27 to _4-45 are repeatedly attached to the agitating blades _4-23 to _4-26 . As described above, since the attachment directions of the auxiliary blades 20 are different from each other, the workpiece is sufficiently crushed and stirred, and the workpiece is sent from the inlet 2a side to the outlet 2e and returned to the opposite side. The action of the stirring blade 4 to be applied is further assisted. The auxiliary feeding blade 20 can be appropriately selected in accordance with the degree of adhesiveness of the material to be dried and the like, as appropriate, with an optimal size, shape, inclination angle, and the like.

The drive mechanisms 5a and 5b have the same configuration corresponding to the rotation shafts 3a and 3b, respectively. Here, the configuration of the drive mechanism 5a on the rotary shaft 3a side will be described. As shown in FIG. 2, a motor 5a- ₁ that is a drive source, and a speed reducer 5a- ₂ that adjusts the number of rotations of the motor 5a- _1. The transmission member 5a- ₃ that transmits the rotational output of the speed reducer 5a- ₂ to the rotary shaft 3a is provided.

The weir plate 6 dams the workpiece supplied into the jacket 2, and the workpiece is 80% or more, preferably 95% or more of the length from the rotation center to the upper end of the stirring blades _4-1 to _4-45. And more preferably a member for holding it so as to be filled up to the height of the upper end (height exceeding the Y level in FIG. 2). If you are holding an object to be processed until stirring blade ₄ -1 _{to 4 -45} from the rotation center to the upper end of a length of at least 80% of the height, casting with preventing and drive mechanism for the stirring blade ₄ -1 _{to 4 -45} Occurrence of overloads 5a and 5b can be prevented. The dimensions and shape of the weir plate 6 are equivalent to the internal shape of the jacket 2 shown in FIG. 3, but in this embodiment, the height of the upper end is hidden by the workpiece to which at least the stirring blades _4-1 to _4-45 are put. The height is set to be higher than the upper height of the stirring blades _4-1 to _4-45 . The material used for the weir plate 6 may be a material that can withstand the extrusion pressure of the dried product by the stirring blades _4-1 to _4-45 , for example, an iron-based metal.

  The support member 7 is a structure for maintaining the jacket 2 at a predetermined height, and is constructed by combining a steel pipe, a shape steel, and the like having a desired strength.

[Auxiliary wing structure]
The outline configuration of the stirring-type drying apparatus 1 has been described above. Next, the auxiliary blade structure according to the present invention will be described. 7A and 7B show a detailed configuration of the auxiliary wing, where FIG. 7A is a perspective view, FIG. 7B is a plan view, and FIG. 7C is a side view. Furthermore, FIG. 8 shows the details of the auxiliary wing piece constituting the auxiliary wing, (a) is a front view, (b) is a plan view, and (c) is a side view. As shown in FIG. 8, the auxiliary wing 20 includes two pairs of substantially L-shaped auxiliary wing pieces 20 a obtained by bending a metal plate member at 90 °, and the outer peripheral ends of the wing pieces 4 a and 4 b (4 c and 4 d). It is formed by fixing to the auxiliary wing mounting seat 12 provided at the edge portion with a bolt 13 and a nut 14. As shown in each drawing of FIG. 8, the auxiliary blade pieces 20a and 20a are provided with bolt holes 11 and 11 through which the bolts 13 and 13 are inserted. With such a configuration, the object to be processed is crushed and stirred. The auxiliary wing pieces 20a, 20a can be appropriately selected in accordance with the degree of adhesiveness of the material to be dried and the like, as appropriate, with the optimum size, shape, inclination angle, and the like. As shown in FIG. 5, the auxiliary wing pieces 20a and 20a are respectively attached to the end faces of the wing pieces 4a to 4d at a predetermined inclination angle θ, and the flat plate surface at the tip is the object to be dried. In addition to crushing and stirring, the movement of the object to be processed and the pulling back movement are given.

As the bolt 13 for fixing the auxiliary blade pieces 20a, 20a, conventionally, the same bolt is used for all of the stirring blades _4-1 to _4-45 . However, since the material to be processed that has not progressed to dwell further on the inlet 2a side, the load on the auxiliary blade 20 increases and the load applied to the bolt 13 also increases. Therefore, for the auxiliary blade 20 on the inlet 20 side, the bolt 13 having relatively higher strength than the auxiliary blade 20 on the outlet 2e side is used. For example, in this embodiment, at least from the inlet 2a. for stirring blade ₄ -1 _{to 4 -10} and stirring blade ₄ -23 _{-4 -32} to 10 th is SUS316L: using M16, -11 _{to 4 -22} and stirring blades ₄ of the discharge port 2e side thereof For the stirring blades _4-33 to _4-45 , SUS316L: M12 is used. That is, the relatively strong bolt 13 is used for about half (50%) of the stirring blades 4 _-1 to _{4-45 on} the inlet 2a side. Thus, stirring blade ₄ -1 _{to 4 -10} and stirring blade ₄ -23 _{-4 -32} from inlet 2a to the 10th uses a bolt 13 of at least 75,000N more tensile strength. Incidentally, the tensile strength of SUS316L: M12 is 42,150N. Note that SUS316L is an austenitic stainless steel containing 18% chromium (Cr) and 12% nickel (Ni), and further adding molybdenum (Mo) to improve corrosion resistance and heat resistance. Moreover, you may use the volt | bolt 13 by SUS316L: M16 with respect to all of the stirring blades _4-1 to _4-45 .

As described above, the stirring blades (stirring blades 4 _-1 to _4-10 and stirring blades 4 _-23 to _4-32 ) on the side close to the charging port 2a, specifically, from the charging port 2a to at least the tenth sheet. By increasing the strength of the bolt, even if the sludge-like workpiece containing copper or the like, having a high water content, a large bulk specific gravity, and a small particle diameter is dried, assistance by rupture of the bolts 13 and 13 The blades 20 and 20 were not dropped off, and the operating rate of the equipment could be improved remarkably. Obviously, if the diameter of the bolt 13 is increased, the tensile strength is increased, and therefore it is clear that the bolt 13 is hardly cut. However, if the diameter of the bolt is simply increased, the auxiliary blade 20 and the auxiliary blade mounting seat 12 are also large. It becomes difficult to attach to the wing pieces 4a to 4d by contacting the jacket 2 or the like. Therefore, the specification of the strength of the bolt is an important element in order to effectively exhibit the cutting prevention effect. Moreover, it can replace with SUS316L: M16 and use of a bolt made from M12: Cr-Mo steel is also possible. The bolt 13 is not limited to the above specification, and any combination of material and bolt diameter is not limited to this as long as a tensile strength of at least 75,000 N or more can be obtained.

[Operation of Stirring Dryer and Auxiliary Blade Structure According to the Present Invention]
Next, the operation of the auxiliary blade structure of the agitation dryer described above will be described. FIG. 9 is a flowchart showing an embodiment of a method for drying an object to be processed according to the present invention. The properties of the object to be treated in the present embodiment are sludge-like having a water content of 30 to 70% by mass, a copper quality of 5 to 50% by mass, a bulk specific gravity of 1.2 to 2.0, and a particle diameter of 1 to 100 μm. Is. Of course, the object to be processed by the drying apparatus 1 in the present embodiment is not limited to such properties.

First, heating steam is introduced into the stirring blades _4-1 to _4-45 via the rotating shafts 3a and 3b, and the driving mechanisms 5a and 5b are driven to _{move the} stirring blades _4-1 to _4-45 at a predetermined speed. (For example, 15 to 30 rpm), the workpiece is introduced into the jacket 2 from the introduction port 2a (step S1: introduction step). The input speed of the object to be processed at this time is 1/3 or less of the rating (for example, 3.0 wt / h). When turning at a faster input rate than the rate of 1/3 of the rated, the treatment object is will be attached cast to stirring blade ₄ -1 _{to 4 -45,} no longer separated from the stirring blade ₄ -1 _{to 4 -45,} drying efficiency This is because it is remarkably lowered and a long-term operation stop is required after several days for removing the casting. Since the jacket 2 contains a large amount of moisture in the exhaust gas, the heated air is heat-exchanged with steam having a vapor pressure of 0.5 to 0.6 MPa in order to prevent dew condensation in the exhaust gas treatment facility and the exhaust duct 2d. Is introduced so that the inside of the jacket 2 does not fall below the dew point temperature. Also, a dust collector (not shown) connected from the exhaust duct 2d via a conduit (not shown) is provided with a steam trace, and at least the inside of the dust collector is maintained at 80 ° C. or higher. It prevents wet operation due to condensation and pressure loss soaring that it becomes impossible to operate.

The object to be processed put into the jacket 2 moves to the subsequent stage while being sequentially stirred by the rotating stirring blades _4-1 to _4-45 and the auxiliary blade 20, and a drying process is performed in the process. In this process, the height position of the workpiece to be dried is 80% or more of the length from the rotation center to the upper end of the stirring blades 4 _-1 to _4-45 , preferably 95% or more. Preferably, semi-drying is performed until the stirring blades _4-1 to _4-45 have a height at which the upper _ends are hidden (step S2: semi-drying step). In this process, especially in the aileron 20 of the stirring blade ₄ -1 _{to 4 -10} and stirring blade ₄ -23 _{-4 -32} cause excessive load, a strong force (shearing force) to the bolt 13 but is applied , SUS316L as bolts 13 and 13 to the aileron 20 of the stirring blade ₄ -1 _{to 4 -10} and stirring blade ₄ -23 _{-4 -32} from at least inlet to 10th: the bolt 13 so using M16, 13 does not break, and the auxiliary wing 20 does not fall off. In the semi-drying step, the object to be processed is dried so that the water content of the object to be processed is 20% by mass or more and less than 30% by mass. Perform semi-dry is to prevent the stirring blade 4 _-1 to 4 cast with prevention and drive mechanism 5a to _-45, the occurrence of 5b overload. In addition, the to-be-processed object which became a semi-dry state is called a semi-dry product. By continuing such a semi-drying process, a semi-dry product is accumulated in the jacket 2 and finally semi-drying is performed until reaching a level at which the upper _ends of the stirring blades _4-1 to _4-45 are hidden (step). S3: Accumulation step).

When the semi-dried product is stored in the jacket 2 to such a height that the stirring blades _4-1 to _4-45 are hidden, the charging speed of the workpiece is set to 80 to 100% of the rated charging speed (for example, 3.0 wt / h). The operation shifts to the rated operation at the charging speed (step S4: drying process). In the drying step, drying is performed so that the water content of the object to be processed is 15% by mass or more and less than 20% by mass. When drying is performed so that the moisture content of the workpiece is less than 15%, the particle size of the workpiece is fine, so that severe dust generation occurs during dry product storage or subsequent transportation, etc. There is a risk of inconveniences such as deterioration of the equipment and a significant shortening of the equipment life. Therefore, the moisture content is temporarily held in the jacket 2 in a semi-dried product having a moisture content of 20% by mass or more and less than 30% by mass, and then the moisture content of the object to be processed is 15% by mass or more and less than 20% by mass by a drying process. Dry so as to be. In addition, the to-be-processed object which became the dried state is called dry goods. Was dried and crushed by rotating the stirring blades 4 _-1 to 4 _-45 in the drying process drying product, overflows a weir plate 6 falls from the discharge port 2e to the discharge chute 2h is discharged to the outside of the jacket 2 (Step S5: Discharge process) Further, it is carried to a predetermined place by a sealed flow conveyor.

Next, examples will be described. The present inventors have dried a sludge-like workpiece having a water content of 30 to 70% by mass, a copper grade of 5 to 50% by mass, a bulk specific gravity of 1.2 to 2.0, and a particle size of 1 to 100 μm. Was dried according to the above-described embodiment, and the damage state of the bolt 13 and the auxiliary blade 20 before and after the change was verified. The results are shown below.
(Change before)
Bolt 13 specifications: All SUS316L: M12
Result: 30 hours / time (stop time around 1 time) × 2 times / month (number of stops) = 60 hours / month operation stop (both auxiliary blades attached to the 10th stirring blade from the inlet side )
(After change)
Specification of bolt 13: Change from 10th slot to SUS316L: M16 from the inlet side Result: As the result of the number of dropouts of 0 or more after 3 months of use, the auxiliary wings 20 have not dropped out, and the equipment It was confirmed that the operating rate can be remarkably improved.

  As described above, according to the auxiliary blade structure of the stirring type drying apparatus having the crushing function according to the present invention, the tension of the bolt 13 that fixes the auxiliary blade 20 to the stirring blade located at least on the discharge port side of the workpiece. Since the tensile strength of the bolt 13 for fixing the auxiliary blade 20 to the blade pieces 4a to 4d located on the inlet side of the workpiece to be processed is relatively stronger than the strength, the bolt 13 on the inlet 2a side with a large load is cut. Therefore, there is no effect that the auxiliary wing 20 is eliminated and the facility operation rate can be improved.

Moreover, according to the auxiliary blade structure of the stirring-type drying apparatus provided with the crushing function according to the present invention, the water content is 30 to 70% by mass, the copper quality is 5 to 50% by mass, and the bulk specific gravity is 1.2 to 2. For drying the sludge-like workpiece to be 0, at least some of the stirring blades located on the inlet side of the workpiece, for example, up to at least the tenth blade (stirring blades _4-1 to _4-10 , 4 ₋₂₃ to _4-32 ), the bolt 13 for fixing the auxiliary blade 20 has a tensile strength of at least 75,000 N or more, specifically, SUS316L: M16 or Cr—Mo steel: M12. There is an effect that damage can be avoided.

  Moreover, according to the drying method of the to-be-processed object which concerns on this invention, a water content is 30-70 mass%, a copper grade is 5-50 mass%, bulk specific gravity 1.2-2.0, and a particle diameter is 1-100 micrometers. Since the sludge-like object to be processed is processed by the agitation-type drying device 1 described above, the object to be processed can be efficiently dried for a long period of time without causing the auxiliary blades to drop off. There is an effect that it is possible.

Moreover, according to the drying method of the to-be-processed object which concerns on this invention, the said to-be-processed object is thrown in from the charging opening 2a of the stirring type drying apparatus 1 with the charging speed of 1/3 or less of a rated charging speed, Semi-drying is performed until the height position of the workpiece reaches a height at which 80% or more of the length from the rotation center to the upper end of the stirring blades _4-1 to _4-45 is hidden. Once the stirring blades _4-1 to _4-45 are stored in the stirring drying apparatus 1 to such a height that they are hidden, the workpiece is fed at a charging speed of 80 to 100% of the rated speed, and drying is performed. between the jacket) in 2-step starts drying from an empty state, and reaches the subsequent stage of the rated operation, the drive mechanism 5a together with cast into the stirring blade 4 _-1 to 4 _-45 is prevented, 5b It is possible to prevent the occurrence of overload.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment of the auxiliary blade structure of the stirring-type drying apparatus having the crushing function. It goes without saying that various modifications and changes are possible within the scope of the gist of the present invention described in the scope. Other than sludge-like workpieces containing copper and the like, having a high moisture content, a large bulk specific gravity, and a small particle size, the present invention can be widely developed.

DESCRIPTION OF SYMBOLS 1 Stirring type drying apparatus 2 Jacket 2a Raw material inlet 2b Heated air supply port 2c Drain discharge port 2d Exhaust duct 2e Discharge port 2f Heated steam supply port 2g Steam supply port 2h Discharge chute 3a, 3b Rotating shaft 4 _-1 to _4-45 Stirring blades 4a to 4d Blade pieces 5a and 5b Drive mechanism 5a _-1 Motor 5a _-2 Reduction gear 5a _-3 Transmission member 6 Dam plate 7 Support member 8 Slit portion 11 Bolt hole 12 Auxiliary wing mounting seat 13 Bolt 14 Nut 20 Auxiliary wing 20a Auxiliary blade

Claims (7)

At least two rotating shafts arranged in parallel to each other are arranged so as to be rotatable in opposite directions to each other, and a plurality of stirring blades are arranged on the rotating shaft with a predetermined interval. The agitating blades attached and the agitating blades attached to the other side are alternately arranged. The agitating blades are substantially disc-shaped when viewed in the axial direction, and a part of the opposed positions is substantially V. A pair of slit portions cut out in a letter shape, and an auxiliary blade for crushing an object to be processed is attached to the circumferential end of the slit portion, and heat is applied to the jacket and the stirring blade In a stirring-type drying apparatus that heats and drys an object to be processed by supplying a medium,
Relative to the tensile strength of the bolt for fixing the auxiliary blade to the predetermined stirring blade located on the inlet side relative to the stirring blade positioned at least on the stirring blade located on the discharge port side of the workpiece A stirrer-type drying apparatus characterized by being strengthened. In the stirring type drying apparatus according to claim 1,
Among the stirring blades arranged on one rotating shaft, the stirring type is characterized in that the tensile strength of the bolt for fixing the auxiliary blade is relatively increased with respect to a predetermined stirring blade within half of the charging port side. Drying equipment. In the stirring type drying apparatus according to claim 1 or 2,
A stirrer type drying apparatus characterized in that a relatively strong tensile strength of the bolt is 75,000 N or more. In the stirring type drying apparatus according to any one of claims 1 to 3,
The bolt having high tensile strength is made of Cr-Mo steel. In the stirring type drying apparatus according to any one of claims 1 to 4,
The bolt having high tensile strength is M16 (SUS316L). At least two rotating shafts arranged in parallel to each other are arranged so as to be rotatable in opposite directions to each other, and a plurality of stirring blades are arranged on the rotating shaft with a predetermined interval. The agitating blades attached and the agitating blades attached to the other side are alternately arranged. The agitating blades are substantially disc-shaped when viewed in the axial direction, and a part of the opposed positions is substantially V. A pair of slit portions cut out in a letter shape, and an auxiliary blade for crushing an object to be processed is attached to the circumferential end of the slit portion, and heat is applied to the jacket and the stirring blade In a drying method of a processing object using a stirring type drying device that heats and drys the processing object by supplying a medium,
At least a discharge port for the object to be processed, which has a water content of 30 to 70% by mass, a copper grade of 5 to 50% by mass, a bulk specific gravity of 1.2 to 2.0, and a particle diameter of 1 to 100 μm. Drying is performed by relatively increasing the tensile strength of the bolt for fixing the auxiliary blade to the predetermined stirring blade located on the inlet side than the tensile strength of the bolt for fixing the auxiliary blade to the stirring blade located on the side. A method for drying an object to be processed. In the drying method of the to-be-processed object of Claim 6,
A charging step of charging the object to be processed from a charging port of the stirring and drying apparatus at a charging speed of 1/3 or less of a rating;
A semi-drying step in which semi-drying is performed until the height position of the object to be treated being dried in the stirring type drying apparatus is at a height where 80% or more of the length from the rotation center to the upper end of the stirring blade is hidden;
When the object to be processed in the semi-dry state is stored in the agitation drying apparatus until the stirring blade is hidden, the drying is performed by supplying the object to be processed at a charging rate of 80 to 100% of the rated value. Process,
A method for drying an object to be processed, comprising:

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