JPWO2014073203A1 - System for drying a fluid processing object and method for producing a dry product using the system - Google Patents

Abstract

The processing system (1) includes a first tank (361) that temporarily receives and preheats a fluid processing target (4), and a processing target (4) preheated by the first tank (361). The first tank (361) is heated using the heat of the second tank (410) that receives and heat-drys and the exhaust (6) containing water vapor discharged from the second tank (410). And a heat recovery unit (500). Furthermore, this processing system (1) has an agitation unit for rotating and stirring the blade (431) in the second tank (410), and the second tank (410) is an exhaust (6) containing water vapor. ) And an exhaust port (460) in which the opening in the second tank (410) faces the rotation direction of the blade (431).

Description

  The present invention relates to a system for drying a fluid processing object.

  Japanese Patent Application Laid-Open No. 2005-337631 discloses a drying apparatus that improves the drying efficiency by scraping the material to be dried adhering to the inside of the drying chamber thoroughly and promoting the pulverization of the material to be dried. This drying apparatus has a vertical cylindrical shape or a truncated cone shape, and has a drying chamber having an inlet and a discharge port for an object to be dried, a heating means for heating the drying chamber, and a rotation standing at the center of the drying chamber. A shaft, a rotational drive mechanism that rotationally drives the rotational shaft, a plurality of arms that are provided at upper and lower stages at intervals on the rotational shaft, an upper surface that is attached to these arms and that is inclined downward in the rotational direction, and rotation And a plurality of stirring blades having scraping edges for scraping off the material to be dried attached to the inner peripheral surface of the drying chamber by rotation of the shaft. Each range of the up-down direction which scrapes the to-be-dried material adhering to the inner peripheral surface of a drying chamber by each scraping edge part of all the stirring blades is continuing over the up-down direction of the inner peripheral surface of a drying chamber.

  There is a need to further reduce the time and cost of drying in a system that heats and drys flowable objects.

  One embodiment of the present invention includes a first tank that temporarily receives and preheats a fluid processing object, and a second tank that receives and heat-drys the processing object preheated by the first tank. And a heat recovery unit that heats the first tank using the heat of the exhaust discharged from the second tank.

  In the process of drying the fluid processing object in the second tank, exhaust gas containing water vapor is discharged from the second tank, and this exhaust gas is discarded to the outside through a dust collector or the like. In this system, a first tank for temporarily receiving an object to be dried in the second tank is provided upstream of the second tank, and the heat (exhaust heat) of the exhaust from the second tank is used. The first tank is heated, and the processing object preheated in the first tank is supplied to the second tank. By heating (preheating) the processing object temporarily stored in the first tank upstream of the second tank using the exhaust heat of the second tank, the cost required for drying can be reduced.

  Further, the time required for drying can be shortened by supplying the processing object preheated in the first tank to the second tank. Furthermore, the fluidity | liquidity of a process target object can be improved by preheating a process target object in a 1st tank. For this reason, handling of the processing object when supplying it from the first tank to the second tank is facilitated, and the processing object can be transferred to the second tank by a low-cost system such as piping or a screw feeder.

  The first tank is preferably a metering tank having a capacity of one batch of the second tank. When the heating and drying process using the second tank is a batch job, the processing tank for the next batch is concentrated by preheating the measuring tank for the capacity of one batch and exhausting heat from the second tank. Can be heated. Therefore, the utilization efficiency of exhaust heat can be improved. Further, when the object to be processed is held at a high temperature for a long time, problems such as corruption are likely to occur, but the occurrence of such a problem can be suppressed by heating the object to be processed for one batch.

  The second tank exhaust contains various components along with water vapor. Therefore, it is desirable that the heat recovery unit includes a heat exchange unit that generates hot water for preheating the first tank by using heat of exhaust gas from the second tank. Generation | occurrence | production of problems, such as corrosion and clogging, in the piping system etc. which preheat a 1st tank can be suppressed.

  This system has an agitation unit for rotating and stirring the blades in the second tank. The second tank is an exhaust port for outputting exhaust gas, and the opening in the second tank is the rotation of the blades. It is desirable to include a vent that points in the direction. Since the opening of the exhaust port faces the downstream side of the flow direction generated in the second tank by the rotation of the stirring unit, solids, powder, dust, etc. generated by drying of the flowing processing object are exhausted. Hard to enter. The amount of solids such as powder contained in the exhaust recovered from the exhaust port can be reduced, and the design of the heat recovery unit becomes easy.

  The system preferably further comprises an injection unit for intermittently blowing off steam in the vicinity of the opening in the second tank of the exhaust port. Steam is typically used to heat the second tank, particularly live steam that is saturated, nearly saturated, or supersaturated. In that case, it is desirable that the system further includes a steam supply unit that supplies heating steam for steam heating the second tank from the outside, and the injection unit blows off a part of the heating steam. By releasing the steam in the vicinity of the opening of the exhaust port, the humidity in the vicinity of the opening can be temporarily raised to prevent the powder (dust) during drying or drying from being discharged together with the gas.

  An example of the agitation unit includes a rotation shaft that passes through the center of the second tank, a plurality of first arms that protrude horizontally from the rotation shaft, and a first arm that is detachably attached to each of the plurality of first arms. 2 and a stirring blade attached to the tip of the second arm, which includes an arc-shaped stirring blade along the inner wall of the second tank. The second arm may include two sub-arms attached so as to form a triangle with the stirring blade. The second arm and the stirring blade may be gradually scraped by stirring the processing object, or may be rarely deformed depending on the state of the processing object. In such a case, the second arm and the stirring blade can be easily replaced.

  The rotating shaft passing through the center of the second tank of the agitation unit is supported so as to be vertically slidable with respect to the lower side of the second tank, and is suspended from above the second tank by the drive unit. It is desirable to be driven to rotate. By supporting the rotating shaft in a slidable state with respect to the lower side of the second tank, the rotating shaft can be stably rotated even when the load applied to the rotating shaft is large, and further, the thermal expansion of the second tank can be achieved. Yes.

  The system may further include a separation unit that separates foreign matters including the packaging material from the waste and supplies the fluid processing target to the first tank. Processing up to separating and drying waste such as food can be processed as one system.

Another aspect of the present invention is a method for producing a dried product using a system for drying a fluid processing object. The system includes a first tank that temporarily receives and preheats a processing object, a second tank that receives a processing object preheated by the first tank and heat-drys the tank, and a second tank. And a heat recovery unit for recovering exhaust heat of exhaust gas including the discharged water vapor, and the method includes the following steps.
1. The object to be processed is dried by the second tank, and the first tank is heated by the exhaust heat recovered by the heat recovery unit.
2. Discharging the dried product produced by heating and drying the object to be processed in the second tank from the second tank;
3. Moving the preheated processing object from the first tank to the second tank;

The block diagram which shows schematic structure of a waste disposal system. The longitudinal cross-sectional view which shows the structure of the vessel of a drying apparatus. The cross-sectional view which shows the structure of the vessel of a drying apparatus. The flowchart which shows the outline | summary of the method of manufacturing a dried material with a waste disposal system.

BEST MODE FOR CARRYING OUT THE INVENTION

  FIG. 1 is a block diagram showing a schematic configuration of a waste treatment system. This waste treatment system (treatment system) 1 regenerates food waste, for example, raw materials (waste) 2 such as household garbage packed in bags and garbage from a food factory into compost, feed, etc. In this system, the separated product 4 is output as a regenerated product 5 by separating the separated product 4 into a foreign material 3 such as a resin bag and a plastic tray that are difficult to reuse. Reusable substances such as food residues are first pulverized and separated (separated) into a fluidized state (separated product, fluid product) 4 by adding water or the like, and then dried. It is converted into a regenerated product (dried product) 5 such as compost and feed.

  An example of the raw material 2 is a relatively homogeneous food residue such as okara, which can be reused as a high-quality and homogeneous fertilizer or feed when it is separated and dried. Even household trash, restaurant trash, hotel trash, etc. can be reused as fertilizer, etc. by separating mixed food residues and other renewable organic substances from foreign matter 3 and drying them. .

  The processing system 1 receives a raw material (waste) 2, pulverizes and agitates it, and separates a foreign material 3 such as a packaging material that is difficult to reuse (separation unit, separation device, sorting device, destructive separation device) 100, The pumping device (quantitative pumping unit, tube pump) 200 that pumps the fluid fraction 4 discharged from the sorting device 100, the storage unit 300 that stores the fraction 4 and the fraction 4 are dried as processing objects. The drying device 400, the weighing unit 350 that temporarily stores and preheats the amount of the fraction 4 to be dried at one time (one job) in the drying device 400, and recovers the heat of the exhaust discharged from the drying device 400. The heat recovery unit 500 used for preheating the weighing unit 350 and a control device (control unit) 800 for controlling these devices and units are included.

  The control unit 800 includes a function (unit) 810 that controls the sorting apparatus 100, a function (unit) 830 that controls the weighing unit 350, and a function (unit) 840 that controls the drying apparatus 400. The control unit 800 may further include a function of detecting the temperature, pressure, and the like of the sorting device 100, the weighing unit 350, and the drying device 400. A typical control unit 800 is a computer including hardware resources such as a CPU and a memory, and a control method described below can be provided as a program (program product).

  The dried product (regenerated product) 5 output from the drying device 400 is stored in a stocker (not shown) and shipped as a product such as feed or fertilizer. When the dried product 5 has a large amount of oil, it is processed again using an oil squeezer and a pulverizer and then shipped as a product.

  The separation device 100 separates the food waste 2 conveyed by a conveyor or the like into a foreign matter 3 and a separated product (processing object) 4. The separation device 100 includes a rotating blade 120 that stirs the food waste 2 input from the input port 110, and separates the food waste 2 into the foreign matter 3 and the separated material 4 by centrifugal force applied by the rotating blade 120. To do. The foreign material 3 is discharged from the discharge port 130 to the foreign material container 710. The fraction 4 is further pulverized by the rotating blades 120 and becomes a fluid state (slurry) by injecting its own moisture or water as required. The separated product 4 in a fluid state is filtered by a porous member (filter, screen) 150 and then sent to a pressure feeding device 200 by a screw conveyor (screw feeder) 180.

  The pressure feeding device 200 pumps the fraction 4 to the storage tank 311 of the storage unit 300 using compressed air (compressed air) 721 obtained from an appropriate air source 720.

  In the drying device 400 disposed downstream of the storage tank 311, the drying process is performed as a batch process. The storage tank 311 includes a function as a buffer that receives the separated product (processing object) 4 continuously processed by the separation device 100 and intermittently supplies the separated product 4 to the drying device 400. The storage tank 311 has a capacity corresponding to several to several tens of times of the amount of the fraction 4 to be processed once (one batch) by the drying apparatus 400. The storage unit 300 includes a stirring device 312 that stirs the fraction 4 in the storage tank 311 and a motor 313 that drives the stirring device 312. In order to keep the viscosity of the fraction 4 stored in the storage tank 311 within an appropriate range, the storage unit 300 may include a system for heating the storage tank 311 with steam or electricity.

  The measuring unit 350 disposed between the storage tank 311 and the drying device 400 drives the first tank (measuring tank) 361, the stirring device 362 for stirring the fraction 4 in the tank, and the stirring device 362. A motor 363. The measuring tank 361 is connected to the storage tank 311 via a valve 330 and a supply pipe 340. The measuring tank 361 is a cylindrical or funnel-shaped tank made of stainless steel, and has a capacity to store the fraction (processed object) 4 in an amount batch-processed by the drying device 400 at a time.

  The first tank 361 includes a jacket structure in which an outer wall (shell, peripheral wall) 364 has a double structure. The shell 364 includes a hot water path 365 through which the hot water 9 circulates from the upper part to the lower part, and warms the fraction 4 temporarily stored in the measuring tank 361 with the hot water 9. In the measuring tank 361, it is desirable that the fraction 4 is maintained at about 50 to 80 ° C., more preferably about 60 to 75 ° C. so as to have appropriate fluidity. The metering unit 350 further includes a water supply device 370 and supplies water for adjusting the fluidity (viscosity) of the fraction 4 in the metering tank 361 from a suitable water source 730 such as a water supply.

  The drying apparatus 400 receives a predetermined amount of the fraction 4 supplied from the measuring tank 361 of the measuring unit 350 as a processing target and performs a drying process. The drying apparatus 400 includes a cylindrical vessel (housing, second tank) 410 and an agitation unit 430 that agitates the fraction 4 of the vessel 410. The vessel 410 has a supply port 420 for receiving the fraction 4 from the weighing unit 350 via the supply pipe 381 at the upper part thereof, and is connected to the measurement tank 361 via the supply pipe 381 including the supply valve 380.

  The agitation unit 430 attached to the inside of the vessel 410 includes a shaft 432 arranged in the vertical direction along the center of the vessel 410, a drive unit 480 arranged at the top of the vessel 410, and the vessel 410. Blade (blade unit) 431. The drive unit 480 rotates the blade unit (stirring blade) 431 via the shaft 432 to stir the fraction 4 in the vessel 410.

  The peripheral wall 412 and the bottom plate 414 of the vessel 410 include a double structure (jacket structure). By passing steam 51 supplied from a steam supply source 780 such as a boiler through the jacket structure, the peripheral wall 412 and the bottom plate 414 are heated. The steam 51 may be superheated steam or saturated steam. The steam temperature is preferably 100 ° C. or higher, preferably in the range of about 110 to 160 ° C., and more preferably in the range of about 120 to 150 ° C. The blade unit 431 is agitated so that the fraction 4 hits the peripheral wall 412, pulverizes the fraction 4 against the peripheral wall 412 heated by the steam 51, and actively heats and drys. The vessel 410 is connected to the boiler 780 by a steam supply pipe 451 and a drain return pipe 452. The steam 51 supplied from the boiler 780 passes through the jacket structure isolated from the inside of the vessel 410 and is not contaminated.

  The vessel 410 has a discharge port 470 for discharging the dried product 5 at the lower part thereof. A transport unit 600 for transporting the dried product 5 to a subsequent process such as a stocker is connected to the discharge port 470. In this example, the conveyance unit 600 includes a screw conveyor 610.

  The vessel 410 has an exhaust port 460 for discharging the water vapor 6 generated by drying the fraction 4 in the vessel. An exhaust pipe 501 is connected to the exhaust port 460, and the exhaust 6 generated in the vessel 410 is supplied to the heat recovery unit 500. The main component of the exhaust 6 is water vapor that is generated when the fraction 4 to be processed is dried, but also includes volatiles contained in the fraction 4. Hereinafter, the exhaust 6 may be referred to as water vapor. The vessel 410 has a steam injection unit 440 for blowing the steam (live steam) 51 supplied from the boiler 780 to the exhaust port 460 and / or the opening of the exhaust port 460 in the vessel 410 at the upper part thereof.

  The heat recovery unit 500 includes a heat exchange unit 520 that generates hot water 9 using the heat of the exhaust gas (water vapor) 6 recovered from the drying device 400, a dust collector 510 installed upstream of the heat exchange unit 520, And a cooler 750 for cooling and discharging the steam or hot water recovered by the exchange unit 520. The waste water discharged from the heat recovery unit 500 is discharged to the outside through the purification device 760, and the gaseous component (exhaust gas) after the heat recovery is discharged to the outside through the deodorizing device 770.

  The hot water 9 generated by the heat exchange unit 520 is sent to the measuring unit 350 through the hot water supply pipe 530 and used to heat the measuring tank 361. The measuring tank 361 has a double wall (jacket structure) on the peripheral wall 364, and heats (warms) the measuring tank 361 by flowing hot water 9 through a hot water path (jacket) 365 on the peripheral wall 364. Waste water (drain) that has heated the measuring tank 361 is temporarily stored in the hot water tank 540 through the return pipe 531, and is supplied to the heat exchange unit 520 by the pump 550.

  FIG. 2 shows a configuration of the vessel 410 of the drying apparatus (drying unit) 400 in a longitudinal direction (vertical direction) sectional view. FIG. 3 shows the configuration of the vessel 410 in a cross-sectional view in the horizontal direction (horizontal direction). The vessel (second tank) 410 includes a pedestal 490 that supports the vessel 410 with respect to the ground or other structure, a cylindrical peripheral wall (side wall) 412 that extends vertically, and an upper plate that seals the upper side ( It is a substantially sealed tank including an upper wall 413 and a lower plate (bottom plate, bottom wall) 414 forming the bottom.

  Outer walls (outer walls) 415 and 416 forming steam paths 453 and 454 for circulating steam are provided on the outer side of the peripheral wall 412 and the lower plate (bottom plate) 414 of the vessel 410, respectively. Connected to the respective steam paths 453 and 454 are nozzles 455 and 457 to which steam 51 is supplied from the boiler 780 and nozzles 456 and 458 for discharging the drain 52. The fraction 4 supplied to the inside 411 of the vessel 410 is stirred by a stirring unit 430 attached to the vessel 410 and dried by being heated by the peripheral wall 412 and the bottom wall 414 heated by the steam 51. The

  The agitation unit 430 includes a shaft 432 disposed along the central axis of the vessel 410, a drive unit 480 that drives the shaft 432, and a plurality of blade units 431 that are rotationally driven in the interior 411 of the vessel 410 by the shaft 432. Including. The drive unit 480 is mounted on the upper plate 413 of the vessel 410, and supports the motor 482, a gear unit 481 that transmits the power of the motor 482 to the shaft 432, and the shaft 432 rotatably with respect to the vessel 410. Bearing unit 485. A load (thrust) in the vertical direction of the shaft 432 is supported by the gear unit 481. That is, the shaft 432 rotates while being suspended from above by the gear unit 481. The load of the shaft 432 may be received above the vessel 410 by another method such as a thrust bearing and lifted by the thermal expansion of the vessel 410.

  The shaft 432 passes through the upper plate 413 through the seal 486, and further extends up and down substantially over the entire interior 411 of the vessel 410. The lower end 432a of the shaft 432 reaches just above the bottom plate 414 of the vessel 410, but the bottom plate. 414 is not touched. A support rod 439 extending upward along the central axis of the vessel 410 is attached to the bottom plate 414. The support rod 439 passes through the lower end 432a of the hollow shaft 432 and is inserted into the shaft 432. The shaft 432 supports the shaft 432 so that the shaft 432 can slide up and down with respect to the support rod 439 from the inside of the shaft.

  Accordingly, the shaft 432 is supported by the bearing unit 485 so as not to move in the horizontal direction, and the lower end is supported by the support rod 439 so as not to move in the horizontal direction, and rotates horizontally along the central axis of the vessel 410. To do. Further, the lower end of the shaft 432 slides up and down with respect to the support rod 439. For this reason, the shaft 432 rotates with its upper end suspended by the drive unit 480. When the vessel 410 is heated by steam and thermally expanded in the vertical direction, the shaft 432 is pulled upward by the drive unit 480, but the lower end of the shaft 432 is slid by the support rod 439 and is not detached from the support rod 439. Even if the vessel 410 is thermally expanded, the upper and lower ends of the shaft 432 are supported at the position of the central axis of the vessel 410 and are stably rotated by the drive unit 480.

  For this reason, even if the load of the fraction 4 to be dried is applied to the blade unit 431, the blade unit 431 can be swung in a state in which the blade unit 431 is close to the side wall 412 without swinging left and right. For this reason, the fraction 4 being dried stuck to the side wall 412 is scraped up (scraped off) by the blade unit 431, and the side wall 412 is coated with the fraction 4, and the heat transfer rate is lowered and the drying efficiency is lowered. This can be suppressed. Therefore, the fraction 4 can be efficiently heated through the side wall 412.

  A plurality of blade units 431 are attached to the shaft 432 so as to be spiral in the vertical direction with respect to the shaft 432, and when the shaft 432 rotates, the blade units 431 also rotate simultaneously. In this example, it rotates clockwise 11 when viewed from above, but it may be designed to rotate counterclockwise. Each blade unit 431 has a first arm 434 attached to the shaft 432 so as to extend in the radial direction (horizontal direction) from the shaft 432 toward the peripheral wall 412, and a plurality of branches at the tip of the first arm 434. A second arm 435 extending like this, and a plate-shaped scraper (scraping blade) 436 attached to the tip of the second arm 435.

  The scraper 436 is an arc-shaped plate member whose outer edge is along the peripheral wall (side wall) 412 of the vessel 410, and is made of, for example, stainless steel. The scraper 436 is attached to the shaft 432 via the arms 434 and 435 so that the rear end is higher than the front end with respect to the traveling direction (clockwise) 11. When the shaft 432 makes one rotation, the scraper 436 attached to the shaft 432 wipes out almost the entire area except for the upper part of the peripheral wall 412 of the vessel 410, and scrapes off the dry separated material 4 attached to the peripheral wall 412. (Scraping up). Each scraper 436 is attached, for example, so as to form an angle of 10 to 15 ° with respect to the horizontal direction, and the scraper so that an area where one scraper 436 sweeps partially overlaps an area where the upper and lower scrapers 436 sweep. An angle and length of 436 is set.

  A projection (claw) 437 protruding upward is attached above the rear end of the scraper 436. For example, the protrusion 437 is a trapezoidal plate body whose front height is high with respect to the rotation direction (traveling direction) 11, and crushes the dried separated product 4 that has been dried and formed into a lump shape. It is effective. Depending on the object to be processed by the system 1, the protrusion 437 may not be provided, and a plurality of protrusions may be provided not only at the rear end of the scraper 436 but also at the middle or front end.

  The second arm 435 that supports the scraper 436 includes a plurality of sub-arms 435 b branched from a connection portion 435 a with the first arm 434. The arm 435 of this example includes two sub-arms 435b branched in a Y-shape, and the scraper 436 is supported at a plurality of front and rear positions by these sub-arms 435b. Therefore, the position and posture of the scraper 436 can be stabilized, and the scraper 436 can be brought close to the peripheral wall 412 to efficiently scrape the separated product 4. The scraper 436 may come into contact with the waste 4 and wear out or be damaged. Therefore, it is desirable that the second arm 435 is attached so as to be detachable. For example, the scraper 436 can be attached to the second arm 435 by bolts or nuts, and the bolts or nuts may be provided on the upper surface or the lower surface of the scraper 436. Since the lower surface of the scraper 436 is less likely to come into contact with the separated article 4, it is easy to suppress the consumption of bolts or nuts.

  In this example, the second arm 435 is also attached to the first arm 434 so as to be detachable by bolts or nuts, and can be replaced when the second arm 435 is worn out or damaged. It has become. The first arms 434 are attached to the shaft 432 at a 120 degree pitch. The interval at which the first arm 434 is attached is not limited to 120 degrees as long as it is an equal interval. In addition, the plurality of first arms 434 are arranged on the shaft 432 in a spiral manner so that each of the plurality of scrapers 436 scrapes the fraction 4 in order from the lower side and scrapes the fraction 4 above the vessel 410. It is attached.

  The movement of the typical fraction 4 in the vessel 410 reaches above the vessel 410 while being heated along the inside of the peripheral wall 412 by a plurality of scrapers 436 and falls toward the bottom wall 414 along the shaft 432. It is. When the fraction 4 falls along the shaft 432, it collides with the branched second arm 435 and is crushed. Therefore, the fraction 4 is stirred and broken while being heated inside the vessel 410, and becomes a relatively fine particle or powder. At that time, moisture contained in the fraction 4 is discharged from the vessel 410 as water vapor 6.

  The vessel 410 includes a supply port 420 that receives the fraction 4 and an exhaust port 460 that discharges a gas (exhaust gas) containing water vapor. The supply port 420 and the exhaust port 460 include nozzles (tube bases) 421 and 461 provided so as to penetrate the upper plate 413, respectively. The opening 462 of the exhaust pipe 461 facing the inside of the vessel 410 is open toward the rotation direction of the stirring unit 430, that is, the clockwise direction 11. In order to control the direction of the opening 462 of the exhaust port 460, the exhaust pipe 461 may be bent inside the upper wall 413 of the vessel 410, and the opening 462 opens in the clockwise direction 11 inside the upper wall 413. The structure may be provided.

  In the interior 411 of the vessel 410, the fraction 4 is heated to generate water vapor 6, and the dried product 5 obtained by drying the fraction 4 is wound up by the scraper 436 to become dust. By directing the opening 462 of the exhaust port 460 in the same direction as the direction of travel of the scraper 436, it is possible to prevent the powdery dry matter 5 scraped up on the top of the vessel 410 while rotating with the scraper 436 from entering the exhaust port 460. In addition, a fluid (gas) containing water vapor 6 as a main component can be discharged from the exhaust port 460.

  Further, a steam injection unit 440 that blows out the steam 51 toward the inside 411 of the vessel 410 is provided at the exhaust port 460 of the vessel 410. In this example, a nozzle 441 for injecting steam is provided in a part of the exhaust pipe 461 so that the steam 51 can be blown out toward the inside 411 of the vessel 410 inside the exhaust pipe 461. By periodically blowing steam into the exhaust pipe 461, the dry matter 5 accumulated in the exhaust pipe 461 can be peeled off in a humidified state and returned to the inside 411 of the vessel 410. For this reason, it is possible to suppress the exhaust pipe 461 from being clogged with the dried product 5 or the dried product 5 being conveyed to the heat recovery unit 500 through the steam discharge tube 501. Moreover, by using the vapor | steam 51 instead of air for the removal of the dried material 5, it can suppress that the dried material 5 rolls up in the dry state and enters into the vapor | steam exhaust pipe 501 side. Therefore, it is desirable that the steam 51 to be injected is saturated or supersaturated steam (live steam) with as little dryness as possible.

  A discharge port 470 for discharging the dried product 5 is provided immediately above the bottom wall 414 of the peripheral wall 412 of the vessel 410. An example of the discharge port 470 is a nozzle (tube base), which may be inclined downward toward the inside of the vessel 410 so as to suppress accumulation of the separated product 4 and the dried product 5 during drying. A screw feeder (screw conveyor) 610 is connected to the discharge port 470. During drying, the discharge port 470 may be closed by an appropriate opening / closing mechanism, for example, a gate or a valve. May be rotated in the opposite direction.

  FIG. 4 is a flowchart showing a process of manufacturing the dried product 5 by the processing system 1. In step 901, a separation process 910 using the separation apparatus 100, a drying process 940 using the drying apparatus 400, and a process 930 for preheating the separated article 4 using the weighing unit 350 are performed in parallel. When there is no waste 2 that is the target of the separation process 910, the separation process 910 is not performed. Similarly, when there is no fraction 4 to be subjected to the drying process 940, the drying process 940 and the pre-heat treatment 930 are not performed.

  In the separation process 910, the function 810 for controlling the separation device of the control unit 800 drives the rotary blade 120, and when the fluid separation material 4 is stored in the separation device 100, the screw feeder 180 supplies the separation material 4 to the pressure feeding device 200. The feeding and pressure feeding device 200 sends the fraction 4 to the storage tank 311 and temporarily stores it.

  In the drying process 940, the function 840 for controlling the drying device of the control unit 800 drives the drive unit 480 of the stirring unit 430 of the drying device 400, and the plurality of blade units 431 are placed in the vessel 410 heated by steam. Rotate. Thereby, the fluidized (sludge-like) fraction 4 received in the vessel 410 is heat-dried and pulverized to produce a dried product 5. In the drying process 940, the control unit 800 periodically operates the solenoid valve 442 of the steam injection unit 440 provided at the exhaust port 460 of the vessel 410 to inject the steam 51 into and around the exhaust port 460, It is possible to prevent the exhaust port 460 from being clogged with the dried product 5 and the dried product 5 from being carried over to the heat recovery unit 500 side.

  In the preheat treatment 930, the function 830 for controlling the measuring unit of the control unit 800 agitates the fraction 4 received in the measuring tank 361 by using the stirring device 362 of the measuring unit 350. The measuring tank 361 is heated by the hot water 9 supplied from the heat recovery unit 500, and the batch 4 of the fractions 4 received in the measuring tank 361 is preheated. In the heat recovery unit 500, the hot water 9 is generated using the heat (exhaust heat) of the water vapor 6 discharged from the vessel 410 of the drying device 400. Since the exhaust heat of the drying device 400 is used for preheating the fraction 4 in the measuring tank 361, the running cost can be reduced. By supplying the preheated fraction 4 to the drying device 400, the processing cost and time of the drying device 400 can be reduced. For this reason, the dried product 5 can be produced at low cost.

  In the measuring tank 361, the fraction 4 for one drying process (one batch) of the drying device 400 is preheated. Therefore, in the measuring tank 361, the preheating is limited to the fraction 4 for the next drying process, and therefore the outlet temperature of the measuring tank 361 for the fraction 4 can be set high. For this reason, even if there is not much steam 6 discharged from the drying apparatus 400, the fraction 4 can be efficiently preheated and the fluidity for conveyance can be ensured. If the fraction 4 is preheated for a long period of time, the fraction 4 may be fermented or spoiled. In this system 1, a limited amount of fraction for one batch is measured by the measuring tank 361. Since 4 is preheated immediately before the drying process, it is possible to prevent such a problem from occurring.

  In addition, by preheating the fraction 4 in the measuring tank 361, the fluidity of the fraction 4 can be increased, and the fraction 4 can be easily conveyed from the metering tank 361 to the vessel 410. For this reason, the fluid fraction 4 can be supplied from the measuring tank 361 to the vessel 410 by a simple pipe or conveyor.

  When the drying process in the drying apparatus 400 is completed in step 902, the dried material 5 is discharged from the vessel 410 by moving the screw feeder 610 of the transport unit 600 in step 903. In step 904, the supply valve 380 is operated, and the fraction 4 preheated in the measuring tank 361 is received in the vessel 410 as a processing object for the next drying process. In step 905, the stirring unit 430 is driven and the drying process is resumed. When the fraction 4 is discharged from the measuring tank 361, the valve 330 is operated in step 906, the fraction 4 for the next drying process is received from the storage tank 311 into the measuring tank 361, and preheating is started.

  In the above description, the present invention has been described by taking the processing system 1 including the sorting device 100, the pressure feeding device 200, the drying device 400, and the like as an example. However, the processing system 1 is a sorted product 4 that has been sorted in another processing system. May be received in the storage tank 311, preheated by the weighing unit 350, and the dried product 5 may be generated by the drying device 400. Further, the processing system 1 may include a degreasing device or the like in addition to the above devices depending on the product (recycled product, dried product) 5 regenerated by the drying device 400 and its application.

Claims (10)

A first tank that temporarily receives and preheats the fluid treatment object;
A second tank for receiving a processing object preheated by the first tank and performing a heat drying process;
And a heat recovery unit that heats the first tank using heat of the exhaust discharged from the second tank.   2. The system according to claim 1, wherein the first tank includes a metering tank having a capacity of one batch of the second tank. In Claim 1 or 2, the exhaust of said 2nd tank contains water vapor,
The heat recovery unit includes a heat exchange unit that generates hot water for preheating the first tank using heat of exhaust gas from the second tank. In any one of Claim 1 thru | or 3, It has a stirring unit which rotates a blade | wing in the said 2nd tank, and stirs it,
The second tank is an exhaust port for exhausting exhaust gas from the second tank, and an opening in the second tank includes an exhaust port facing a rotation direction of the blades.   5. The system according to claim 4, further comprising an injection unit that intermittently blows off steam in the vicinity of the opening in the second tank of the exhaust port.   6. The system according to claim 5, further comprising a steam supply unit that supplies heating steam for steam heating the second tank from the outside, wherein the injection unit blows out part of the heating steam. In any of claims 4 to 6,
The stirring unit includes a rotation shaft passing through the center of the second tank;
A plurality of first arms protruding in a horizontal direction from the rotating shaft;
A second arm detachably attached to each of the plurality of first arms;
A stirring blade attached to the tip of the second arm, the stirring blade including an arcuate shape along the inner wall of the second tank;
The second arm includes two sub-arms attached to form a triangle with the stirring blade. In any of claims 4 to 6,
The stirring unit includes a rotation shaft passing through the center of the second tank;
A drive unit that rotates the rotating shaft;
The rotation shaft is supported so as to be slidable up and down with respect to the lower side of the second tank, and rotates in a state of being suspended from above the second tank. In any of claims 1 to 8,
The system further comprising a separation unit that separates foreign matters including a packaging material from waste and supplies the fluid processing object to the first tank. A method for producing a dried product using a system for drying a fluid processing target,
The system includes a first tank that temporarily receives and preheats the processing object;
A second tank for receiving a processing object preheated by the first tank and performing a heat drying process;
A heat recovery unit that recovers heat of exhaust gas including water vapor discharged from the second tank,
The method is
Drying the object to be processed by the second tank, and heating the first tank by the exhaust heat recovered by the heat recovery unit;
Discharging the dried product produced by heating and drying the processing object in the second tank from the second tank;
Moving the preheated treatment object from the first tank to the second tank.

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