JP2010236731A - Drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying device drying a treatment object with high moisture by a high treatment capacity. <P>SOLUTION: The drying device has: a first dryer 1 provided with a heating agitation part 14 and having a drying chamber 11 with a decompressed interior; and a second dryer 2 provided with a heating agitation part 24 and having a drying chamber 21 with a decompressed interior. After drying the treatment object by the first dryer 1, it is further dried by the second dryer 2. By providing a larger decompression value in the second dryer 2 than a decompression value of the first dryer 1, and a larger rotational speed in the heating agitation part 24 of the second dryer 2 than a rotational speed in the heating agitation part 14 of the first dryer 1, the treatment object having a high moisture content is continuously dried to have a low moisture content, and deodorization is also carried out. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drying device that dries a high-moisture object such as organic sludge.

  Conventionally, in order to dry high-moisture processed materials such as organic sludge and garbage in a sewage treatment plant, the boiling point of the water is lowered by reducing the boiling point of water by reducing the pressure in the drying chamber into which the processed material is put. A drying apparatus that evaporates moisture at a low temperature has been proposed (see Patent Document 1).

  In the drying apparatus described in Patent Document 1, sludge as an object to be processed put into a drying chamber inside a cylindrical vacuum steam kettle is heated by a jacket that is formed on the peripheral surface and is supplied with heating steam. At the same time, stirring is performed with a plurality of disk-shaped stirring blades arranged in the axial direction in the drying chamber. When the object to be processed is dried and powdered, this drying device reverses the rotation direction of the disk-shaped stirring blade and sends the object to be discharged to a discharge port provided at one end of the drying chamber. When the discharge of the workpiece is completed, a new high-moisture workpiece is fed into the drying chamber from the inlet.

JP 2004-313918 A

  However, the conventional drying apparatus heats an object to be processed only with a jacket provided on the peripheral surface of the drying chamber even when the drying chamber is depressurized. Therefore, the heating efficiency is relatively low and the processing capacity is relatively low. There is a problem.

  Further, the conventional drying apparatus has a problem that it is difficult to improve the processing capacity because the processing object is dried by batch processing.

  Then, the subject of this invention is providing the drying apparatus which can dry the high moisture to-be-processed object with high processing capacity.

In order to solve the above problems, the drying apparatus of the present invention includes a drying chamber into which an object to be processed is charged and the inside of which is decompressed;
A rotating shaft disposed in the drying chamber and supplied with a heat medium therein, a coiled tube fixed to the rotating shaft and supplied with a heat medium therein, and an outer peripheral side of the coiled tube. A heating and stirring unit having a blade
And a jacket formed on the wall surface of the drying chamber and supplied with a heat medium.

  According to the said structure, the to-be-processed object thrown in in the drying chamber is stirred with the coiled tube and blade of this heating stirring part, contacting the rotating heating stirring part. The object to be treated is heated by receiving heat from a heating medium supplied to the inside of the rotating shaft and the coiled tube from the rotating shaft and the coiled tube of the heating and agitating unit in contact. Since the rotating shaft of the heating and stirring unit and the coiled tube have a large contact area with the object to be processed, the object to be processed can be efficiently dried by the heat of the heat medium supplied to the inside. Further, the object to be processed is heated by receiving heat from a heat medium supplied to the jacket from a jacket formed on the wall surface of the drying chamber.

  In this way, the object to be treated is efficiently heated by the heating and stirring unit that receives the stirring action, and is also heated by the jacket on the wall surface of the drying chamber, so that the water is effectively evaporated and dried with good efficiency. To do. Therefore, the drying apparatus of the present invention can dry a high-moisture object to be processed with a higher processing capacity than before. Here, high moisture means that the workpiece has a moisture content of 80 to 99% by mass ratio.

The drying apparatus according to an embodiment includes a plurality of drying chambers having a heating and stirring unit and the inside of which is depressurized, and sequentially processes the objects to be processed in the first drying chamber to the drying chambers subsequent to the second drying chamber. Formed to send and process,
The rotation speed of the heating and stirring unit of the drying chamber after the second drying chamber is higher than the rotation speed of the heating and stirring unit of the first drying chamber.

  According to the above-described embodiment, the object to be processed put into the first drying chamber is heated and stirred by the heating and stirring unit in a state where the pressure is reduced, and the amount of water is reduced. Here, since the object to be processed in the first drying chamber has a high moisture content of 80% or more by mass ratio, the heating stirring unit is rotated by rotating the heating stirring unit at a relatively low rotational speed. It is possible to ensure the contact time between the rotating shaft and the coiled tube body to be processed, and to effectively dry the object to be processed.

  The object to be processed which has been processed in the first drying chamber and has reduced moisture is put into the second drying chamber. The object to be processed put into the second drying chamber is heated and stirred by the heating and stirring unit in a state where the pressure is reduced, and the amount of water further decreases. In the case where a further drying chamber is provided, the objects to be processed are sequentially sent to the subsequent drying chamber for processing, and the amount of water decreases sequentially. Here, the object to be processed in the drying chambers after the second drying chamber has a relatively low amount of water after being dried in the first drying chamber, so that the solid components tend to aggregate and become so-called lumps. The drying efficiency of the whole object to be processed tends to be reduced due to the occurrence of lumps. Dama means that the object to be processed aggregates in a spherical shape by receiving a rotational force in the drying chamber, and the surface part continues to dry while the inside remains moist. Here, since the heating and stirring unit of the drying chamber after the second drying chamber is rotated at a rotation speed larger than the rotation speed of the heating and stirring unit of the first drying chamber, formation of lumps is prevented, and the object to be processed is It can be dried with good efficiency to reduce moisture. Note that low moisture means that the object to be processed has a moisture content of 30% or less by mass ratio.

  The drying apparatus according to an embodiment continuously and sequentially conveys the workpieces from the first drying chamber to the drying chambers after the second drying chamber, and a charging device that continuously throws the workpieces into the first drying chamber. A conveyance device and a discharge device for continuously discharging the workpiece from the final drying chamber are provided.

  According to the above embodiment, the processing object is continuously charged into the first drying chamber by the charging device, and the processing object is sequentially sequentially transferred from the first drying chamber to the drying chambers after the second drying chamber by the transfer device. By transporting and continuously discharging the object to be processed from the final drying chamber by the discharge device, the object to be processed can be dried by continuous processing, and the object to be processed is much more efficient than by batch processing. Can be dried. Here, “continuous” is not limited to a state in which each apparatus always operates continuously, but includes a case where the apparatus stops depending on the situation.

  In the drying apparatus according to one embodiment, the drying chambers subsequent to the second drying chamber are arranged below the first drying chamber.

  According to the said embodiment, the to-be-processed object processed in the 1st drying chamber can be easily conveyed to the drying chamber after the 2nd drying chamber by the gravity which acts on a to-be-processed object. Here, by making the pressure reduction amount of the second drying chamber larger than the pressure reduction amount of the first drying chamber, the object to be processed can be more easily transported from the first drying chamber to the second drying chamber by the combined use of the suction action. .

  The drying apparatus according to an embodiment has an air lock provided with a sealing valve at an inlet and an outlet, and is configured to suck and input a workpiece in the air lock into the first drying chamber. ing.

  According to the above-described embodiment, the workpiece is introduced into the charging device in a state in which the sealing valve at the inlet of the airlock is opened and the sealing valve at the outlet of the airlock is closed, and then the inlet of the airlock is sealed. Close the valve and open the airlock outlet valve. As a result, the object to be processed can be quickly and surely charged into the drying chamber due to the difference in atmospheric pressure between the drying chamber in which the pressure is reduced and the air lock.

  The drying apparatus according to one embodiment includes a condensing unit that condenses vapor from a workpiece, a suction pump that sucks air in the drying chamber together with condensed water condensed in the condensing unit, and air in the drying chamber sucked by the suction pump. And a scrubber that brings the condensed water into contact with the deodorizing fluid, and the deodorizing fluid of the scrubber is cooling water that circulates between the condensing unit and the scrubber.

  According to the above-described embodiment, the air in the drying chamber and the condensed water are sucked by the suction pump, whereby the decompression of the drying chamber and the recovery of the condensed water can be efficiently performed. Moreover, by making the air and condensed water in a drying chamber contact the cooling water as a deodorizing fluid with a scrubber, the air and condensed water in the drying chamber can be deodorized and the cooling water can be cooled. Therefore, a cooling function can be added to the scrubber, and the operating efficiency of the drying apparatus can be improved.

  In one embodiment, an enzyme is added to a deodorizing fluid.

  According to the said embodiment, the air and condensed water in a drying chamber can be deodorized more efficiently.

  In the drying apparatus according to one embodiment, the object to be processed is organic sludge or garbage.

  According to the above-described embodiment, it is possible to efficiently dry the organic sludge that is mainly handled as industrial waste and the garbage that is handled as general waste.

It is sectional drawing which shows typically the structure of the drying apparatus of embodiment. It is a longitudinal cross-sectional view of a 1st dryer. It is a cross-sectional view of a drying apparatus. It is a top view of a drying device. It is a cross-sectional view of the drying apparatus of a modification. It is a side view of the drying apparatus of another modification.

  Hereinafter, the drying apparatus of the present invention will be described in detail with reference to the illustrated embodiments.

  Drawing 1 is a sectional view showing typically the composition of the drying device of an embodiment. The drying apparatus of the present embodiment is roughly configured by a first dryer 1, a second dryer 2, and a cooling tower 3 as a scrubber.

  2 is a longitudinal sectional view of the first dryer 1, FIG. 3 is a transverse sectional view of the drying device, and FIG. 4 is a plan view of the drying device.

  The first dryer 1 includes a substantially cylindrical casing 12 having a drying chamber 11 therein, a jacket 13 formed on the lower wall surface of the drying chamber 11, and a heating stirring unit 14 disposed in the drying chamber 11. Have.

  An input port 12 a into which the object to be processed is input is formed at the upper part of one end of the casing 12, and a discharge port 12 b through which the object to be processed is discharged is formed at the lower part of the other end of the casing 12. An input device 51 for supplying an object to be processed is provided at the input port 12 a of the casing 12. The charging device 51 incorporates an air lock mechanism in which sealing valves are provided at the inlet and outlet of the workpiece. After the workpiece is introduced from the inlet of the charging device 51, when the sealing valve at the inlet is closed and the sealing valve at the outlet is opened, the atmospheric pressure between the atmospheric pressure charging device 51 and the drying chamber 11 lower than the atmospheric pressure. Due to the difference, the object to be processed is sucked and put into the drying chamber 11.

  The heating and stirring unit 14 includes a rotating shaft 141 supported at both ends by bearings 121 and 122 provided on both end surfaces of the casing 12, a coiled tubular body 142 fixed to the rotating shaft 141, and a coiled tubular body 142. It has a plurality of rectangular blades 143 arranged on the outer peripheral side and having a side of 5 to 10 cm. The rotating shaft 141 and the coiled tube 142 are in communication with each other, and steam as a heat medium is supplied into the rotating shaft 141 and the coiled tube 142 via a bearing. The heating and stirring unit 14 is driven to rotate by the motor M, heats the object to be processed by the rotating shaft 141 and the coiled tube 142, and sends the object to be processed in the casing 12 from the inlet 12a toward the outlet 12b. It is formed to stir while applying. The blade 143 has a surface in which the radial leading edge of the heating and agitating unit 14 is inclined in the rotational direction, and the side edge on the discharge port 12b side in the axial direction is inclined in the counter-rotating direction. As a result, as the heating and stirring unit 14 rotates, the blade 143 scrapes the object to be processed in the vicinity of the inner surface of the casing 12. A maintenance window (not shown) extending in the longitudinal direction is provided on the side surface of the casing 12, and this maintenance window is opened to perform maintenance such as adjustment of the mounting angle of the blade 143 of the heating and stirring unit 14 and replacement of the blade 143. To do.

  The bearings 121 and 122 of the casing 12 support the rotating shaft 141 of the heating and stirring unit 14 and supply and discharge steam as a heat medium. The supply-side bearing 121 includes a casing 124 connected to the steam supply pipe 123 and a sleeve bearing 125 that is provided in the casing 124 and supports the rotating shaft 141. The interior of the housing 124 communicates with the interior of the rotating shaft 141 through a plurality of communication holes 141 a provided on the peripheral surface of the rotating shaft 141 and also communicates with the interior of the jacket 13. The discharge-side bearing 122 includes a housing 127 connected to the steam discharge pipe 126 and a sleeve bearing 128 that is provided in the housing 127 and supports the rotating shaft 141. The interior of the housing 127 communicates with the interior of the rotating shaft 141 through a plurality of communication holes 141 b provided on the peripheral surface of the rotating shaft 141 and also communicates with the interior of the jacket 13. Steam supplied from a boiler (not shown) to the supply-side bearing 121 through the steam supply pipe 123 is supplied to the rotating shaft 141 through the communication hole 141 a and also supplied to the jacket 13. A part of the steam supplied to the rotating shaft 141 is supplied to the coiled tube 142. The steam supplied to the rotating shaft 141 and the coiled tubular body 142 exchanges heat with the object to be contacted by the rotating shaft 141 and the coiled tubular body 142, and then passes through the communication hole 141 b of the rotating shaft 141 to discharge the bearing. Return to 122. The steam that has returned to the discharge-side bearing 122 is returned to the boiler through the steam discharge pipe 126.

  The coiled tubular body 142 of the heating and stirring unit 14 is formed of an upstream coil 144 and a downstream coil 145. The interior of the rotating shaft 141 is partitioned into an upstream chamber 146 that communicates with the supply-side bearing 121 and a downstream chamber 147 that communicates with the discharge-side bearing 122. The upstream ends 144 a and 145 a of the upstream coil 144 and the downstream coil 145 communicate with the upstream chamber 146 of the rotating shaft 141. The downstream ends 144 b and 145 b of the upstream coil 144 and the downstream coil 145 communicate with the downstream chamber 147 of the rotating shaft 141. Thereby, the steam supplied to the supply side bearing 121 is distributed and flowed to the upstream side coil 144 and the downstream side coil 145, and the heating temperature between the upstream side end and the downstream side end of the coiled tubular body 142. The difference is reduced.

  A condensing unit 15 for condensing the vapor evaporated from the object to be processed and discharging it to the outside is provided in the upper part of the casing 12. The condensing unit 15 includes a cooling water supply chamber 151 formed on one end surface of the casing 12 and a cooling water discharge chamber 152 formed on the other end surface of the casing 12. A cooling water supply pipe 153 that supplies cooling water from the cooling tower 3 is connected to the cooling water supply chamber 151. A cooling water discharge pipe 154 that discharges cooling water and returns it to the cooling tower 3 is connected to the cooling water discharge chamber 152. Between the cooling water supply chamber 151 and the cooling water discharge chamber 152, a plurality of cooling water pipes 155, 155,... Extending in the axial direction of the casing 12 and communicating at both ends with the supply chamber 151 and the discharge chamber 152.・ ・ Is provided. The plurality of cooling water pipes 155, 155,... Are arranged on both sides in the width direction of the upper part in the casing 12, as shown in the cross-sectional view of FIG. A water collecting basin 154 for collecting condensed water is provided on the side and below the plurality of cooling water pipes 155, 155,. A suction pipe 157 that sucks the air in the drying chamber 11 together with the condensed water communicates with the inside of the water collecting tank 156.

  The second dryer 2 has the same configuration as the first dryer 1 except for the inlet and the outlet. That is, it has a casing 22 having a drying chamber 21 inside, a jacket 23, and a heating and stirring unit 24. The heating and agitating unit 24 includes a rotating shaft 241 and a coiled tube 242 to which steam is supplied, and a plurality of rectangular blades 243 that are provided on the outer peripheral side of the coiled tube 242 and have a side of 5 to 10 cm. . A condensing unit 25 for condensing the vapor evaporated from the object to be processed and discharging it to the outside is provided in the upper part of the casing 22. The blade 243 of the heating / stirring unit 24 of the second dryer 2 also has a surface inclined in the rotational direction, like the blade 143 of the heating / stirring unit 14 of the first dryer 1, in the radial direction. In addition, the side edge on the discharge port 22b side in the axial direction is inclined in the counter-rotating direction. A maintenance window (not shown) extending in the longitudinal direction is provided on the side surface of the casing 22.

  In the casing 22 of the second dryer 2, an inlet 22 a is formed at the lower part on one end side, and an outlet 22 b is formed at the lower part on the other end side. The discharge port 12b of the casing 12 of the first dryer 1 and the input port 22a of the casing 22 of the second dryer 2 are connected by a transfer conveyor 52 formed by a screw conveyor. A discharge conveyor 53 formed by a screw conveyor is connected to the discharge port 22 b of the second dryer 2. At the end of the discharge conveyor 53, a discharge device 54 having an air lock mechanism is provided.

  As shown in FIGS. 3 and 4, the first dryer 1 and the second dryer 2 are arranged at substantially the same height so that the longitudinal directions of the casings 12 and 22 are parallel to each other.

  In both the first and second dryers 1 and 2, enzymes are added in the drying chambers 11 and 21. Enzymes are added to the drying chambers 11 and 21 by collecting and culturing microorganisms such as indigenous bacteria and fermenting bacteria that inhabit the natural world such as the sea, mountains, and land. In particular, in order to ferment organic sludge such as excess sludge and perform deodorization, it has been found that various animals and plants and bacteria that inhabit soil are effective. Examples of animals and plants and soils in which fungi inhabit include wormwood, wild grass, medicinal herbs, seaside grass, bamboo shoots, bamboo bush soil, mountain forest soil, fish, seaweed, fruits, pineapples, apples, mandarin oranges, loquat and grapes. It is preferable to use the bacteria that inhabit them by culturing with rice bran or sawdust. In this embodiment, under a reduced pressure of 0.03 to 0.07 MPa, the heating medium temperature is 60 to 80 ° C. for 30 minutes to 2 to 3 hours. Therefore, microorganisms that are fermented and grown under such conditions are preferred. As an enzyme added to the drying chambers 11 and 21, at least one of the following enzymes can be employed. In addition, the substance which each enzyme acts is described in the parenthesis following each enzyme. Alcohol dehydrogenase (alcohol), lactate dehydrogenase (lactose), glucose 6-phosphate dehydrogenase (carbohydrate), aldehyde dehydrogenase (aldehyde), L, aspartate, beta-semialdehyde, NADP Oxdrectase (aldehyde), glutamate dehydrogenase (amino acid), aspartate semialdehyde dehydrogenase (amino acid), NADPH2 cyclochrome C-reactase (NADP), glutathione dehydrogenase (glutathione), Trehalose phosphate synthetase (carbohydrate), polyphosphae kinase (ATP), ethanolamine phosphae cytidyltransferase (CTP), trehalose phosphatase (carbohydrate), metal O-phospho glycerate phosphatase (glycerin), inulase (inulin), β-mannositase (carbohydrate), uridine nucleositase (amino acid), cytosine diaminase (cytosine), methylcysteine synthetase (amino acid), aspartate synthetase (ATP) ), Succinate dehydrogenase (succinic acid), aconitic acid hydrogenase (citrate), fumarate hydrogenase (malonic acid), maleate dehydrogenase (malonic acid), citrate synthetase (acetyl CouA) , Isocitrate dehydrogenase (citrate), LSNADP oxidase (citrate), monoamine oxidase (amine), histamine (amine), pyruvate decarboxylase (oxoacid), ATPase (ATP), nucleotide pyrophosphatase (nucleic acid), endopolyphosphatase (ATP), ATP phosphohydrolase (ATP), orotidine 5-phosphate decarboxylase (orotidine). By including a microorganism containing at least one of these enzymes in the object to be processed W, it is possible to effectively perform a decomposition process on the object to be processed W composed of many kinds of organic components.

  The cooling tower 3 is supplied with condensed water sucked by the vacuum pumps VP1 and VP2 from the condensing units 15 and 25 of the first and second dryers 1 and 2 and air in the drying chambers 11 and 21. The cooling tower 3 cools the cooling water collected from the cooling water discharge chamber 152 of the first dryer 1 and the cooling water discharge chamber of the second dryer 2 with wind, and the cooled cooling water is cooled by the cooling water pumps P1 and P2. Return to the cooling water supply chamber 151 of the first dryer 1 and the cooling water supply chamber of the second dryer 2. Moreover, the cooling tower 3 functions as a scrubber for performing a deodorizing process of condensed water, and the cooling water functions as a deodorizing fluid for the scrubber.

  The cooling tower 3 includes a nozzle 31 for injecting cooling water, a flow lower part 32 in which the cooling water injected from the nozzle 31 flows down, a fan 33 for sending air to the cooling water flowing through the flow lower part 32, and the flow lower part. A water tank 34 is provided for receiving the cooling water flowing through 32. Connected to the water tank 34 are a cooling water pipe from which the cooling water is led from the condensing unit 15 and a condensed water pipe from which the condensed water is led from the vacuum pumps VP1 and VP2. A dust separator is interposed in the condensed water pipe. In the water tank 34, one end of a watering pipe provided with a watering pump SP is opened, and the other end of the watering pipe is connected to the nozzle 31. A porous filler made of resin is disposed in the flow lower portion 32. In the cooling tower 3, the condensed water guided to the water tank 34 is mixed with the cooling water, and the cooling water mixed with this condensed water is guided to the nozzle 31. When the cooling water sprayed from the nozzle 31 flows through the lower portion 32, the temperature is lowered by the wind from the fan 33 and flows into the water tank 34. The cooling water cooled by the cooling tower 3 is returned to the condensing parts 15 and 25 of the first and second dryers 1 and 2 by the cooling water pumps P1 and P2.

  An enzyme is added to the cooling water circulating between the cooling tower 3 and the condensing parts 15 and 25. This enzyme is added by introducing microorganisms such as indigenous bacteria and fermenting bacteria into the cooling water in the same manner as the microorganisms are added to the drying chambers 11 and 21. The enzyme added to the cooling water may be at least one of the plurality of enzymes that can be added to the drying chambers 11 and 21 described above. By adding an enzyme to the cooling water, odor components and water-soluble harmful substances contained in the condensed water are decomposed and removed. Degradation of odor components and the like by the enzyme is performed in a cooling water circulation path formed between the cooling tower 3 and the condensing units 15 and 25. In particular, it is preferable that the filler in the lower part 32 of the cooling tower 3 functions as a microbial carrier and promotes odor decomposition in the lower part 32.

  The drying apparatus of the present embodiment reduces the concentration of odorous components and the like as a whole by mixing condensed water with cooling water, so there is little risk of exceeding the ability to treat microorganisms even if the odorous components of condensed water increase. Thus, stable microbial treatment can be performed. Moreover, since the inside of the drying chambers 11 and 21 is depressurized, the temperature rise of the cooling water when the cooling water exchanges heat with room air in the condensing units 15 and 25 is relatively small, and the temperature of the cooling water is approximately 40-45 ° C. Thereby, the disadvantage that the microorganisms in the cooling water are killed by the high temperature is prevented, the microorganisms are stably activated, and the condensed water can be stably deodorized by the microorganisms.

  Further, in the cooling tower 3, the evaporation of the cooling water is promoted, so that almost no overflow occurs. In addition, odor components and the like in the condensed water can be highly decomposed and removed because they are diluted with cooling water. Therefore, it is possible to effectively prevent the disadvantage that odor components and harmful components are discharged outside the drying apparatus. Further, the air in the drying chambers 11 and 21 is guided to the water tank 34 together with the condensed water by the vacuum pumps VP1 and VP2. Odor components and the like contained in the air guided to the water tank 34 are dissolved in contact with the cooling water in the water tank 34 or the cooling water dropped from the downstream 32, and are decomposed and removed by microorganisms of the cooling water. Thus, the cooling tower 3 also functions as a scrubber of air guided from the drying chambers 11 and 21, and the cooling water functions as a deodorizing fluid.

  When drying an object to be processed by the drying apparatus, the air inside the first drying chamber 11 is sucked by the vacuum pump VP1, and the air inside the second drying chamber 21 is sucked by the vacuum pump VP2, and both Depressurize to a pressure lower than atmospheric pressure. Here, the reduced pressure value of the first drying chamber 11 can be set to 0.03 to 0.07 MPa, and the boiling point of water can be lowered to about 90 to 68 ° C. The reduced pressure value refers to the magnitude of pressure that is reduced from atmospheric pressure. On the other hand, the reduced pressure value of the second drying chamber 21 can be set to 0.05 to 0.09 MPa, and the boiling point of water can be lowered to about 80 to 46 ° C.

  As the heat medium supplied to the dryers 1 and 2, steam of 0.2 to 0.3 MPa and 130 ° C. is used for the jackets 13 and 23, while 0.7 to 0. Steam of 8 MPa and 170 ° C. is used. In this way, by supplying the heating medium having a temperature higher than that of the jackets 13 and 23 to the heating and agitating units 14 and 24 that are movable parts, it is possible to efficiently evaporate while preventing adhesion of the object to be processed. Moreover, since the inside of the drying chambers 11 and 21 is depressurized, the temperature of the heat medium can be set lower than when drying at normal pressure. Therefore, the generation energy of the steam as the heat medium can be reduced. In addition, since the heating temperature of the object to be treated is low, it is possible to prevent the microorganisms that are added to the first and second drying chambers 11 and 21 and deodorize from being killed, and the deodorization can be performed effectively.

  The first drying chamber 11 is charged with a high-moisture object having a water content of 80 to 96% by mass, while the second drying chamber 21 is dried in the first drying chamber 11. Then, a medium-moisture object to be processed having a water content of 50 to 60% by mass is charged. The second drying chamber 21 dries the medium-moisture processed material, and discharges the low-moisture processed material having a water content of 30% or less by mass ratio. Here, the reduced pressure value of the second drying chamber 21 is set larger than the reduced pressure value of the first drying chamber 11, and the second drying chamber 21 is dried in a state where the atmospheric pressure is lower than that of the first drying chamber 11. Thereby, in the 2nd drying chamber 21 in which the moisture content of a to-be-processed object is less than the moisture content of the to-be-processed object of the 1st drying chamber 11, drying efficiency is improved and it matches with the drying efficiency of the 1st drying chamber 11. Can do. Therefore, the amount of the object to be dried in the first drying chamber 11 and transported to the second drying chamber 21, and the amount of the object to be dried in the second drying chamber 21 and discharged from the second drying chamber 21, It can be almost the same. As a result, the drying process can be continuously performed in the first drying chamber 11 and the second drying chamber 21. Here, the continuous drying process is a process in which an object to be processed is continuously input to the first dryer 1 by the input device 51 and is continuously transferred from the first dryer 1 to the second dryer 2 by the transport conveyor 52. Thus, the present invention is not limited to the case where the object to be processed is conveyed, and further, the object to be processed is continuously discharged from the drying chamber 21 from the second dryer 2 by the discharge conveyor 53. If at least the heating and agitating unit 14 of the first dryer 1 and the heating and agitating unit 24 of the second dryer 2 are operating continuously, the object to be processed by the input device 51 and the object to be processed by the conveyor 52 The conveyance of the object and the discharge of the object to be processed by the discharge conveyor 53 may be intermittent.

  Furthermore, it is preferable to set the rotation speed of the heating and stirring unit 24 in the second drying chamber 21 to be higher than the rotation speed of the heating and stirring unit 14 in the first drying chamber 11. As a result, the processing object in the drying second drying chamber 21 that has a lower moisture content than the processing object in the first drying chamber 11 and is difficult to dry is dried to the same extent as the processing object in the first drying chamber 11. In the first drying chamber 11 and the second drying chamber 21, continuous processing of the workpiece can be performed. Here, the rotation speed of the heating and stirring unit 14 of the first drying chamber 11 can be set to 10 rpm (per rotation), while the rotation speed of the heating and stirring unit 24 of the second drying chamber 21 can be set to 30 rpm. In addition, while setting the rotational speed of the heating stirring part 14 of the 1st drying chamber 11 between 1 rpm-20 rpm according to the moisture content of the to-be-processed object of the 1st drying chamber 11 and the 2nd drying chamber 21, 2nd The rotation speed of the heating and stirring unit 24 in the drying chamber 21 can be set between 10 rpm and 60 rpm.

  Further, the heating and agitating units 14 and 24 of the first drying chamber 11 and the second drying chamber 21 are arranged on the inner side surfaces of the casings 12 and 22 by blades 143 and 243 provided on the outer peripheral side of the coiled tubular bodies 142 and 242, respectively. A workpiece to be processed in the vicinity can be scraped off. Therefore, it is possible to effectively prevent inconvenience that the object to be processed adheres to the inner surface of the casing 12, 22 where the jackets 13, 23 are formed.

  In the drying apparatus according to the above embodiment, the low-moisture object that has been dried by the first dryer 1 and the second dryer 2 and has a moisture content of 30% or less is the air lock mechanism of the discharge device 54. Discharged through.

  As described above, the drying apparatus of the present embodiment uses the first dryer 1 and the second dryer 2 to set the drying chamber 21 of the second dryer 2 at a reduced pressure value larger than the drying chamber 11 of the first dryer 1. By reducing the pressure and rotating the heating / stirring unit 24 of the second dryer 2 at a higher rotational speed than the heating / stirring unit 14 of the first dryer 1, the high-moisture object to be processed is separated from the first dryer 1 and the first dryer 1. It is possible to obtain a low-moisture processed material by continuously performing a drying process with a 2 drier 2 drier. Further, the condensed water condensed by the first dryer 1 and the second dryer 2 can be deodorized by the cooling tower 3 functioning as a scrubber. Thus, for example, organic sludge having a strong odor such as sewage sludge and human waste can be dried and deodorized with high efficiency. As a result, it was confirmed that the drying efficiency of the object to be processed can be increased to about three times the conventional efficiency.

  In the said embodiment, the to-be-processed object processed with the 1st dryer 1 is from the discharge port 12b of the lower part of the casing 12 of the 1st dryer 1 to the inlet 22a of the lower part of the casing 22 of the 2nd dryer 2, Although it conveyed with the conveyance conveyor 52 extended horizontally, as shown in the cross-sectional view of FIG. 5, an inlet is provided in the upper part of the casing 22 of the 2nd dryer 2, and the lower part of the casing 12 of the 1st dryer 1 is provided. The material to be processed may be conveyed from the discharge port 12b to the charging port at the upper portion of the casing 22 of the second dryer 2 through the conveyor conveyor 52 disposed at an inclination.

  In the above-described embodiment, the drying device is formed by arranging the first dryer 1 and the second dryer 2 at substantially the same height, but is arranged in the second dryer 2 below the first dryer 1. May be. As shown in the side view of FIG. 6, by disposing the second dryer 2 directly below the first dryer 1, a transport conveyor for transporting the object to be processed of the first dryer 1 to the second dryer 2 is provided. Omitted, the object to be processed of the first dryer 1 can be conveyed to the second dryer 2 only by the opening / closing valve 55. Here, by making the reduced pressure value of the drying chamber 21 of the second dryer 2 larger than the reduced pressure value of the drying chamber 11 of the first dryer 1, the suction action of the second dryer 2 causes the first dryer 1 to The object to be processed can be easily transported.

DESCRIPTION OF SYMBOLS 1 1st dryer 2 2nd dryer 3 Cooling tower 11,21 Drying chamber 12,22 Casing 13,23 Jacket 14,24 Heating stirring part P1, P2 Cooling water pump VP1, VP2 Vacuum pump

Claims (8)

A drying chamber in which an object to be processed is introduced and the inside is decompressed;
A rotating shaft disposed in the drying chamber and supplied with a heat medium therein, a coiled tube fixed to the rotating shaft and supplied with a heat medium therein, and an outer peripheral side of the coiled tube. A heating and stirring unit having a blade
A drying apparatus comprising: a jacket formed on a wall surface of the drying chamber and supplied with a heat medium. The drying apparatus according to claim 1, wherein
Provided with a plurality of drying chambers having a heating and agitation section, the inside of which is depressurized, and is formed so as to sequentially process the objects processed in the first drying chamber to the drying chambers after the second drying chamber. ,
The drying apparatus characterized in that the rotation speed of the heating and stirring unit of the drying chamber after the second drying chamber is higher than the rotation speed of the heating and stirring unit of the first dryer. The drying apparatus according to claim 2,
An input device that continuously inputs the object to be processed into the first dryer, a conveyance device that sequentially conveys the object to be processed from the first drying chamber to the drying chambers subsequent to the second drying chamber, and a final drying chamber And a discharge device that continuously discharges the object to be processed. The drying apparatus according to claim 2,
A drying apparatus, wherein a drying chamber after the second drying chamber is disposed below the first drying chamber. The drying apparatus according to claim 2,
The charging device has an air lock provided with a sealing valve at an inlet and an outlet, and is formed so that a workpiece in the air lock is sucked into the first drying chamber to be charged. apparatus. The drying apparatus according to claim 2,
A condensing unit that condenses the vapor from the workpiece, a suction pump that sucks the air in the drying chamber together with the condensed water condensed in the condensing unit, and the air and the condensed water that is sucked by the suction pump in contact with the deodorized fluid And a scrubber to be used, and the deodorizing fluid of the scrubber is cooling water that circulates between the condensing unit and the scrubber. The drying apparatus according to claim 5, wherein
A drying apparatus, wherein an enzyme is added to a deodorizing fluid. The drying apparatus according to claim 1, wherein
A drying apparatus characterized in that the object to be treated is organic sludge or garbage.

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