WO2019044996A1

WO2019044996A1 - Apparatus and method for producing fuel by fermenting and drying object to be treated

Info

Publication number: WO2019044996A1
Application number: PCT/JP2018/032175
Authority: WO
Inventors: 眞一下瀬
Original assignee: 株式会社下瀬微生物研究所
Priority date: 2017-08-31
Filing date: 2018-08-30
Publication date: 2019-03-07
Also published as: CN111051478A; CN111051478B; JP2019044040A; PH12020500383A1; JP6763575B2

Abstract

[Problem] To ferment and dry waste and the like using microorganisms while heating the waste under reduced pressure by using a fermentation-drying device 3; produce fuel from a dried product thus obtained; and suppress non-uniformity of thermal energy of this fuel and facilitate use. [Solution] The present invention is provided with: a fermentation-drying device 3 which holds waste (object to be treated) including organic waste in a tank 30 (a sealed container), heats and stirs in a predetermined temperature range, and ferments organic matter using microorganisms, thereby obtaining a volume-reduced dried product; a vibrating screen 4 (a classifier) which classifies the dried product thus obtained, and sorts the dried product into relatively large grains and relatively small grains; and a storage device 6 which temporarily stores the large grains and the small grains, respectively.

Description

Fueling device and method for fueling by fermentative drying of treated object

TECHNICAL FIELD The present invention relates to a fueling apparatus and method for fermentative drying of an object to be treated including organic waste.

In the past, for example, it has been proposed to incinerate waste (general waste) discharged from general households and industrial wastes from various places of business etc. and generate power using the waste heat, The objects to be treated include various organic wastes such as garbage, paper waste, human waste, miscellaneous waste water, animal and plant residues, sludge, etc., and some of them have high moisture content, so thermal energy generated by combustion Becomes unstable. In addition, when the water content is high and the latent heat of vaporization of water is required, thermal energy may be added by using fossil fuel.

In this regard, the inventor of the present application stores organic waste such as food waste in a closed container, adds predetermined microorganisms, and stirs while heating to a predetermined saturated vapor temperature range under reduced pressure, Patent application has already been filed for an apparatus (fermentation drying apparatus) capable of efficiently evaporating and drying water while promoting the fermentation of the organic matter to be treated.

For example, in the fermentation / drying apparatus described in Patent Document 1, the evaporation of water from the organic waste inside is promoted by reducing the pressure in the closed container, and the fermentation / drying time is shortened, and the pressure is reduced by the pressure reduction. Since the boiling point is lowered, it is not necessary to make the temperature too high, and it is possible to prevent the death of the microorganism due to the temperature rise.

JP 2007-319738 A

However, the above-mentioned object to be treated contains various organic substances, and when these are burned, the thermal energy generated varies. For this reason, just by fermenting and drying in the fermentation / drying apparatus as in the conventional example (Patent Document 1), the variation becomes large, and it is difficult to control the combustion when it is used as a fuel for a power generation combustion furnace. There was a serious side.

In view of this point, the object of the present invention is obtained by using a known fermentation / drying apparatus to ferment using a microorganism while heating an object to be treated including organic waste under reduced pressure. The purpose of the present invention is to burn dry matter and to suppress variations in the generated heat energy to make it easy to use as fuel for a combustion furnace.

In order to solve the above-mentioned subject, the fuel-ized device by fermentation drying of the processing object concerning the present invention accommodates the processing object containing organic waste in a closed vessel, and heats it under predetermined pressure to a predetermined temperature range under decompression. While fermenting and fermenting the organic matter using microorganisms to obtain a reduced-volume dried product, and the dried product obtained by the fermented-drying apparatus and classifying it into relatively large large particles A classification device for dividing into relatively small particles and a storage device for temporarily storing the large particles and the small particles are provided.

With this configuration, in the fueling device of the present invention, fermentation of the organic matter can be promoted using microorganisms by the fermentation / drying device in the same manner as in the above-described conventional example (Patent Document 1), and drying can be efficiently performed. Also, the dried product thus obtained is classified to be divided into relatively large large particles and relatively small particles, and these are temporarily stored in a storage device.

The large particles of the dried product classified in this manner generally include, in the object to be treated, a plastic that generates high heat energy at the time of combustion. In other words, it is sufficient to set the size of the sieving mesh or the like so that the plastic etc. can be separated from the waste of the object to be treated. Specifically, for example, the size of the mesh to be sieved is preliminarily examined by experiment, calculation, etc. It may be set to about 10 to 50 mm.

On the other hand, organic waste (dry matter) which has been sufficiently fermented and dried in a fermentation / drying apparatus will be fractionated as small grains other than the above-mentioned large grains. Small particles are reduced in moisture content and homogenized by fermentation and drying, and the generated thermal energy is also stable. Therefore, if these large particles and small particles are temporarily stored, they can be appropriately mixed to provide a fuel for stably generating the thermal energy of the combustion furnace.

Thus, when dividing into large particles and small particles, the dried material processed by the fermentation drying apparatus has an advantage that it is easy to screen since it has less water content than before the treatment. However, since the fermentation and decomposition time differs depending on the organic matter, the time for sufficiently reducing the size by fermentation and drying is not constant.

Taking this point into consideration, it is preferable to divide the above-mentioned classification device into relatively large particles, relatively small particles, and medium particles of an intermediate size. A re-introducing device for re-introducing the medium-sized matter into the closed container to be processed again by the fermentative drying apparatus. In this case, those which are not sufficiently reduced in size by fermentation and drying will be fractionated as medium particles.

Therefore, temporarily storing small particles that generate stable thermal energy and large particles that generate high thermal energy, it is possible to further reduce the variation in thermal energy generated by mixing these appropriately. Can. On the other hand, by carrying out the reprocessing in the fermentative drying apparatus, the fermentative dry can be made into a stable granular material of the thermal energy to be generated by reprocessing in the fermentative drying apparatus the insufficient medium granules.

Further, it is more preferable to provide a crusher for crushing the object to be treated in a closed container of a fermentation / drying apparatus before containing it, thereby crushing the object to be treated including organic waste. By reducing the size, it is possible to further promote its fermentative drying.

More preferably, a combustion furnace for burning the large particles and small particles, and a mixing ratio of the large particles and small particles from the storage device so that the amount of heat generated in the combustion furnace is maintained constant. And a metering supply device for adjusting and supplying the combustion furnace. In this way, the mixing ratio of the large particles and the small particles can be adjusted, and combustion can be performed in the combustion furnace, and fuel can be supplied with reduced variation in the generated thermal energy, and the generated thermal energy of the combustion furnace can be maintained constant. it can.

From another point of view, the present invention is a method of treating an object to be treated using the fueling apparatus as described above, wherein the object to be treated including organic waste is accommodated in a closed vessel, and the predetermined condition is obtained under reduced pressure. While stirring with heating to a temperature range, fermenting the organic matter using microorganisms and fermenting organic matter to obtain a reduced-volume dried product, and classifying the dried product obtained by this fermented drying process, relative It has a classification process which divides into a large globule and relatively small globules, and a storage process which temporarily stores the globules and small globules, respectively.

By this method, as described above, microorganisms can be used for the object to be treated including organic waste to accelerate the fermentation and drying, and the drying can be performed efficiently. And if the obtained dried matter is classified into large particles and small particles and temporarily stored, then, by mixing them as necessary, the variation of the thermal energy generated as the fuel of the combustion furnace is suppressed be able to.

According to the fueling device by the fermentation and drying of the object to be treated according to the present invention, the object to be treated including the organic waste is heated under reduced pressure using the fermentation and drying device, and the fermentation of the organic matter is promoted using microorganisms. At the same time, when drying efficiently, the resulting dried product is classified, divided into large particles and small particles, and temporarily stored, so that the dispersion of thermal energy generated at the time of combustion is suppressed by mixing them. Can be used as fuel for combustion furnaces.

It is a schematic block diagram of the whole fueling apparatus which concerns on embodiment. It is a schematic block diagram of a magnetic separator. It is a schematic block diagram of a fermentation drying apparatus. It is a schematic block diagram of a vibrating sieve machine. It is a flowchart figure showing an example of the operating procedure of a fueling device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of a fueling device for a combustion furnace according to an embodiment of the present invention, and this fueling device is disposed, for example, in a city waste disposal facility, and is discharged from general households, various businesses, etc. Waste is converted to fuel for the combustion furnace and burned in the power generation combustion furnace. Although not shown, the waste disposal facility is provided with a pit into which collected waste is carried.

The waste stored in this pit is mainly general waste and contains various organic wastes such as high moisture content food waste, paper waste, cloth, wood, etc. packed in waste bags, and plastic And other nonflammable materials such as combustibles and metals. In addition, the waste may not be classified as general waste and may contain organic waste such as urine, household waste water, animal and plant residues, sludge, etc. Depending on the waste treatment facility, coarse shredded large waste may be mixed. .

And the fueling device of the combustion furnace of the present embodiment is a crusher 1 (crushing device) to which general waste in the pit (hereinafter simply referred to as “waste”) is supplied by a bucket crane or the like, and crush thereby And a receiving hopper 2 into which the wastes are charged, and the conveyers 21 associated with the receiving hoppers 2 supply the wastes to the fermentation / drying apparatus 3. In addition, a magnetic separator 22 is also provided which removes metal from the dust being transported by the transport conveyor 21.

The fermentation / drying apparatus 3 ferments and dries the waste under a reduced pressure, as described in detail below, and the dried product processed by the fermentation / drying apparatus 3 is large by the vibrating sieving machine 4 (classifier), It is sieved (sorted) into three medium and small sizes. The “medium-sized” dried matter (hereinafter, also referred to as medium-sized matter) is transported by the re-loading line 5 (re-loading device) composed of a plurality of transport conveyors and re-loaded into the receiving hopper 2.

On the other hand, dried products of “large size” and “small size” (hereinafter, also referred to as large particles and small particles, respectively) are temporarily stored in the storage device 6. The storage device 6 measures and mixes the

storage hoppers

61 and 62 for temporarily storing large particles and small particles, and the large particles and small particles, respectively, and supplies the mixture as fuel for the combustion furnace 71, It has 64 and. Then, a part of the heat energy generated in this combustion furnace is supplied to the fermentation and drying apparatus 3 through the steam control device 75.

In the present embodiment, the steam generation boiler 7 drives a generator such as the steam turbine generator 9 via the steam path 73, and supplies power generated thereby to the electric power company. In addition, part of the power is also used as drive power for the fermentation and drying apparatus 3. The generator may be a Stirling engine generator.

The crusher 1 is, for example, a multi-axial low-speed rotary crusher, and as schematically shown in FIG. 1, each cutting blade shears dust by rotation of a pair of rotating shafts 10. There is. As a result, food waste, paper waste, wood, etc. become a size suitable for fermentation and drying, and a plastic etc. is crushed to a certain extent and becomes a size suitable for sieving. In addition, as a crusher, a single-shaft type low-speed rotary crusher, a high-speed rotary crusher, a compression crusher, etc. can also be used.

Further, the magnetic separator 22 is, for example, a hanging type, and is suspended on the transport conveyor 21 as schematically shown in FIG. The magnet (shown by a black circle) is attracted by a magnet and discharged continuously by a belt 22b moving between pulleys 22a. In addition to the suspension type, for example, a magnetic separator such as a pulley type or a drum type may be used, or an eddy current magnetic separator capable of removing non-ferrous metals such as aluminum cans may be used. It makes it possible to remove metal objects. In addition, the magnetic separator 22 may be installed on the transfer conveyor 37.

-Fermentation dryer-
The fermentation / drying apparatus 3 is a known apparatus described in Patent Document 1 and the like, and as described below, the waste to be treated is stirred while heating to a predetermined temperature range under reduced pressure, and microorganisms Is used to ferment the organic matter to obtain a reduced-volume dried product.

As schematically shown in FIG. 3, as described above, the fermentation / drying apparatus 3 is airtightly formed so as to keep the inside at atmospheric pressure or lower as a sealed container for containing waste supplied by the transport conveyor 21 as described above. A cylindrical tank 30 is provided. A heating jacket 31 is provided on a peripheral wall portion of the tank 30, and high temperature steam is supplied through the steam control device 75.

Further, a stirring shaft 32 extending in the longitudinal direction (left and right direction in FIG. 3) is provided inside the tank 30 so as to be surrounded by the heating jacket 31 and rotated at a predetermined rotational speed by an electric motor 32a. It is supposed to be. The stirring shaft 32 is provided with a plurality of stirring plates 32b spaced apart in the axial direction, thereby allowing the waste to be stirred and fed in the longitudinal direction of the tank 30 after the completion of the fermentation and drying. A hydraulic motor may be used instead of the electric motor 32a.

That is, at the upper part of one longitudinal direction side (left side in FIG. 3) of the tank 30, the waste insertion port 30 a for the waste supplied from the transport conveyor 21 is provided, and the waste introduced from here is heated by the heating jacket 31. While being heated, stirring is performed by the rotation of the stirring shaft 32 as described above. Then, after a predetermined time has elapsed, the fluid is discharged from the discharge part 30 b provided at the lower part of the tank 30.

Although the details are not shown, in the present embodiment, a passage for steam is also formed inside the stirring shaft 32 and the stirring plate 32b, and the steam for heating from the steam control device 75 via the steam passage 70 is also formed here. Is to be supplied. As a result, the waste can be heated from the inside while stirring the waste by the stirring shaft 32. Then, the drain water having the steam condensed therein is returned to the steam control device 75 through the steam path 70.

In the upper part of the tank 30 which heats refuse, the guide part 30c which guides the vapor which generate | occur | produced from the heated refuse to the condensation part 33 is protrudingly provided, and the on-off valve is connected to the communication path 34 to the condensation part 33 from here. 34a is provided. The condenser 33 includes a plurality of cooling pipes 33b supported by a pair of heads 33a, and a cooling water passage 80 is provided between the cooling pipes 33b and a cooling tower 8 described below.

That is, as schematically shown in FIG. 3, the cooling tower 8 includes a water receiving tank 81 into which the cooling water discharged from the condensing section 33 flows, and a pumping pump 82 for pumping the cooling water from the water receiving tank 81. And a nozzle 83 for injecting the cooling water. The cooling water jetted from the nozzle 83 receives air from the fan 85 while flowing down the flow lower portion 84, and its temperature is lowered, and then flows into the water receiving tank 81 again.

The cooling water thus cooled by the cooling tower 8 is supplied by the cooling water pump 86, returned to the condenser 33 by the cooling water passage 80, and circulated through the plurality of cooling pipes 33b as described above. The temperature rises due to the heat exchange with the vapor generated from the waste. Then, the cooling water is returned to the cooling tower 8 again by the cooling water passage 80. That is, the cooling water circulates through the cooling water path 80 between the condenser 33 and the cooling tower 8.

In addition to the cooling water that circulates in this manner, in the cooling tower 8, condensed water of steam generated from waste heated in the condensing section 33 is also injected. That is, although not shown, a water collecting portion is provided below the condensing portion 33, and condensed water generated in the condensing portion 33 is collected. And in this embodiment, the vacuum pump 36 is connected to the condensation part 33 via the communicating path 35, and the pressure in the tank 30 is reduced.

Therefore, when the vacuum pump 36 is operated, air and condensed water are sucked out of the condensation section 33 through the communication path 35, and the air and condensed water in the tank 30 are further transmitted through the communication path 34 and the guiding portion 30c. Come to suck out Thus, the condensed water is sucked from the condensation section 33 to the vacuum pump 36, and is led from the vacuum pump 36 to the water receiving tank 81 of the cooling tower 8 by the water conduit.

Thus, the condensed water introduced to the water receiving tank 81 of the cooling tower 8 mixes with the cooling water and is pumped up by the pumping pump 82 as described above, and after being jetted from the nozzle 83, it is cooled while flowing down the downstream portion 84. . The condensed water contains the same microorganisms as those added to the waste in the tank 30, and the odor component etc. contained in this condensed water is decomposed, so the odor does not escape to the outside of the tank.

-Operation of Fermentation Drying Equipment-
The waste contained in the tank 30 is heated by the high temperature steam supplied to the heating jacket 31 (and the steam passage such as the stirring shaft 32). While being, it is agitated with rotation of agitating shaft 32. The temperature of the steam supplied from the steam control device 75 is preferably, for example, about 140.degree.

Then, in response to the heating from the outside by the heating jacket 31 surrounding the inside of the tank 30 and the heating from the inside by the stirring shaft 32 or the like, the temperature is effectively raised and the stirring by the stirring shaft 32. In addition, since the pressure is reduced by the operation of the vacuum pump 36, the boiling point is lowered in the tank 30, the evaporation of water is accelerated, and the fermentative drying is promoted.

In addition, it is preferable that one process is 2 hours, for example in the fermentation drying process by the fermentation drying apparatus 3, and it will be made to ferment garbage over 30 minutes first. When the pressure in the tank 30 is reduced to -0.06 to -0.07 MPa (gauge pressure, hereinafter the gauge pressure is omitted), the water temperature in the tank 30 is maintained at 76 ° C to 69 ° C (saturated vapor temperature). Ru. As a result, waste is mainly fermented and decomposed by the following microorganisms.

Next, it takes 1.5 hours to dry the waste during fermentation. Therefore, if the pressure in the tank 30 is further reduced to -0.010 to -0.092 MPa, the water temperature in the tank is maintained at 42 to 46 ° C (saturated vapor temperature), and the drying of waste is sufficiently promoted. .

In addition, SHIMOSE 1 is March 14, 2003 to FERM BP-7504 (Patent Microorganisms Depositary Center, Institute of Technology for Industrial Science and Technology, Institute of Industrial Technology, Research Institute for Biotechnological Research, Institute of Technology and Technology, Ibaraki Prefecture, Japan). (The one deposited internationally). In addition, SHIMOSE 2 is a microorganism belonging to FERM BP-7505 (as deposited internationally as in SHIMOSE 1), Pichiafarinosa resistant to a salt, and SHIMOSE 3 is a microorganism belonging to FERM BP-7506 (SHIFOSE 1 and Similarly, those deposited internationally) are microorganisms that belong to Staphylococcus (Staphylococcus).

-Vibrating sieve machine-
As described above, the dried material processed by the fermentation / drying apparatus 3 is sieved in the vibrating sieving machine 4 and classified into three sizes of large, medium and small. The vibrating screen 4 according to the present embodiment sifts the dried material into, for example, large particles of 50 mm or more, small particles of, for example, 30 mm or less, and medium particles of an intermediate size thereof.

As an example is shown in FIG. 4, the vibration sieving machine 4 floatingly supports the cylindrical housing 41 with respect to the lower base 43 by a plurality of (for example, four) coil springs 42, and a lid that closes the upper end opening of the housing 41 At 44, a dry matter inlet 44a is provided. A feed hopper 45 is disposed above the feed port 44a, and the dried matter discharged from the tank 30 of the fermentation and drying apparatus 3 is fed by the transport conveyor 37 (see FIG. 1).

Thus, three wire nettings 46a to 46c are installed horizontally almost vertically spaced from each other in the interior of the housing 41 into which the dried material is introduced. The mesh of the upper wire mesh 46a is, for example, 50 mm corresponding to the size of the large particles, and the mesh of the middle wire mesh 46b is, for example, 30 mm corresponding to the size of the medium particles.

Also, coarse mesh striking receptacles 47 are disposed below the respective metal meshes 46a to 46c at predetermined intervals, and a plurality of mesh striking rubber balls 48 are disposed on the upper surfaces thereof at predetermined intervals. It is placed. Then, three discharge ports 41a to 41c are provided apart from each other in the vertical direction on the outer periphery of the housing 41 so as to correspond to the upper surfaces of the three metal meshes 46a to 46c, respectively, and the respective metal meshes 46a to 46c It is designed to discharge the sieved large, medium and small dry matter.

Furthermore, in order to close the lower end opening of the housing 41, an inverted mortar-shaped bottom portion 49 whose inner peripheral side protrudes upward is disposed. The vibration motor 50 is disposed below the bottom portion 49 which closes the lower end opening of the housing 41 as described above.

The vibration motor 50 is housed in the interior thereof so as to be surrounded by the peripheral wall of the cylindrical lower base 43, and is suspended from the lower end portion of the housing 41 via an elastic bracket 41e and the like. Eccentric weights 50a and 50b are provided on the upper and lower sides of the vibration motor 50, respectively, and when the eccentric weights 50a and 50b rotate eccentrically, the housing 41 is vibrated as a whole.

In this way, when the entire housing 41 vibrates, the dried material introduced from the insertion port 44a of the lid portion 44 on the upper side first moves toward the outer peripheral side while rolling on the upper wire mesh 46a. Then, the dried product having a size of 50 mm or more reaches the outer periphery of the housing 41 without passing through the mesh of the wire mesh 46a, and is discharged out of the housing 41 from the upper outlet 41a as large particles.

On the other hand, the dried product having a size of less than 50 mm passes downward through the mesh of the upper wire mesh 46a and drops downward, and this time, it rolls on the middle wire mesh 46b and moves toward the outer periphery. The dry matter having a size of 30 mm or more reaches the outer periphery of the housing 41 without passing through the mesh of the wire mesh 46b, and is discharged out of the housing 41 from the middle discharge port 41b as a medium particle.

Furthermore, the dried product having a size of less than 30 mm passes downward through the wire mesh of the middle wire mesh 46b and falls downward, rolling toward the outer circumferential side while rolling on the lower wire mesh 46c, and moving as the small particles. It is discharged out of the housing 41 from the discharge port 41c.

In addition, as a classification apparatus, it is not restricted to the above-mentioned vibration sifter 4, For example, a trommel, a rocking type | mold sorter, a rotor type sorter etc. can be used.

Among the dried products screened in such a manner, large particles mainly contain plastics and the like, and the heat energy generated is large. On the other hand, medium-sized and small-grained products are mainly produced by fermenting and drying organic matter, and in particular, small-grained products are fermented and the components are homogenized, so the thermal energy generated by combustion is stable. .

On the other hand, medium-sized matter is not suitable for use as a fuel for a combustion furnace because fermentative drying has not progressed compared to small-sized matter, so the medium-sized matter is again fed to the fermentation drying apparatus 3 Then, it can be shaped as small particles by fermenting and drying again.

Therefore, in the present embodiment, the above-mentioned large particles and small particles are temporarily stored, respectively, and used as a fuel to be supplied to the combustion furnace 71, while medium particles are returned to the fermentation drying device 3 and fermented and dried again. I am trying to do the processing. That is, the medium-sized matter discharged from the middle stage discharge port 41b of the vibrating sieving machine 4 as described above is conveyed by the re-introduction line 5 composed of a plurality of conveyance conveyors and is introduced into the receiving hopper 2 of the fermentation / drying device 3. Ru.

On the other hand, the large and small particles discharged from the upper and

lower outlets

41a and 41c of the vibrating sieving machine 4 are separated into the

storage hoppers

61 and 62 of the storage device 6 and temporarily stored. Then, the large and small dried materials are respectively measured by screw type metering and feeding devices 63 and 64, mixed and fed to the combustion furnace 71.

The

screw feeders

63a and 64a are driven by electric motors (not shown), respectively, of the above-mentioned measuring and feeding devices 63 and 64, and the rotation thereof causes the dried matter (large particles, small particles) to be delivered. Since the amount of supply per hour by this changes depending on the number of rotations of the

screw feeders

63a and 64a, the large particles contained in the fuel supplied to the combustion furnace 71 can be changed by changing the respective number of rotations of the metering devices 63 and 64. It is possible to adjust the proportion of material and small particles.

The steam generation boiler 7 that burns the fuel (large particles and small particles) supplied and generates high temperature steam includes a combustion furnace 71 and a steam generation unit 72 although detailed description is omitted. ing. The combustion furnace 71 is of a general structure, and the supplied fuel falls from the hopper and is fed by the screw feeder 74 as described above.

The steam generation unit 72 heats the water by the combustion heat energy of the fuel thus fed to generate steam for power generation. In the present embodiment, as described above, the power generation steam generated in the steam generation unit 72 of the steam generation boiler 7 is supplied to the steam turbine generator 9 to supply power to the electric power company.

Further, the heating steam is supplied to the fermentation / drying apparatus 3 (the heating jacket 31 of the tank 30, etc.) via the steam control device 75, and heats the inside of the tank 30 as described above with reference to FIG. As a result, the drain water in which the steam is condensed is discharged from the heating jacket 31 and the like, flows through the steam path 70, and returns to the steam generation unit 72.

Next, the procedure of the refuse disposal by the fueling device by the fermentation and drying of the object to be treated will be described. First, as shown in the flow chart of FIG. 5, in the pretreatment step (step S1), it is stored in pits. The present waste is introduced into the crusher 1 and crushed into a predetermined size and then introduced into the receiving hopper 2. Then, while being transported by the transport conveyor 21, the magnetic separator 22 removes iron pieces and the like contained in the dust.

Subsequently, in step S2, the lid of the inlet 30a of the tank 30 of the fermentation and drying apparatus 3 is opened, and the waste transported by the transport conveyor 21 is loaded. At this time, the inside of the tank 30 is at atmospheric pressure, and then the lid of the inlet 30 a is closed to seal the inside of the tank 30. Further, the on-off valve 34 a in the communication passage 34 from the guide portion 30 c of the tank 30 to the condensation portion 33 is in the open state.

In step S3, as described above with reference to FIG. 3, the inside of the tank 30 is heated under reduced pressure to promote the fermentation and drying of the waste contained therein (fermentation and drying step).

Then, the inside of the tank 30 is heated by the supply of the heating steam, and the stirring shaft 32 is rotated at a predetermined rotation speed (for example, about 8 rpm). Furthermore, the inside of the tank 30 is depressurized by the operation of the vacuum pump 36, whereby the boiling point of the water in the tank 30 is lowered, the evaporation of the water is accelerated, and the fermentative drying of the waste is promoted.

Thus, while maintaining the temperature and pressure in the tank 30, the vacuum pump 36 is temporarily stopped when a predetermined time (for example, about 2 hours) elapses. At this time, the dry matter is reduced in volume. Then, it is determined in step S4 whether or not this fermentation and drying step has been repeated a preset number of times, and if it is a negative determination (NO), the process returns to step S2.

Thus, waste can be introduced into the tank 30, and the above-mentioned fermentation and drying process can be repeated a set number of times, whereby a large amount of waste can be sufficiently fermented and dried. Then, if an affirmative determination (YES) is made in step S4, the operation proceeds to step S5 to stop the operation of the vacuum pump 36 and the steam control device 75, reversely rotates the stirring shaft 32, and opens the lid of the discharge unit 30b. The dry matter is discharged from the tank 30 (atmospheric pressure (discharge)).

As described above, the dried product is fermented and dried and reduced in volume. The dried product is suitable for sieving, which is transported by the transport conveyor 37 and introduced into the vibrating sieving machine 4 from the input hopper 45. Then, by the operation of the vibrating sieving machine 4, sieving into large, medium and small dried products as described above with reference to FIG. 4 (classifying step: step S 6) The medium is re-injected (medium particle conveyance: step S7).

On the other hand, large particles and small particles are temporarily stored in the

storage hoppers

61 and 62, respectively (storage step: steps S8 and S9). Then, the large particles and small particles temporarily stored are metered and mixed, and supplied as a fuel to the combustion furnace 71 of the steam generating boiler 7 (step S10).

The step S3 of the flow of FIG. 5 stores the waste to be treated in the tank 30, and stirs while heating to a predetermined temperature range under reduced pressure while fermenting and drying the organic matter using microorganisms to reduce It corresponds to a fermentation and drying step of obtaining the dried product.

Therefore, according to the fueling device by the fermentation and drying of the object to be treated according to the present embodiment, the inside of the tank 30 containing the organic substance-containing waste is depressurized using the known fermentation / drying device 3 to lower the boiling point of water Thus, the water can be efficiently evaporated at a relatively low temperature to accelerate the drying. By lowering the temperature in this manner, the microorganisms can be activated to promote the fermentation of the organic matter.

Furthermore, the dry matter so burned in the steam generating boiler 7 is obtained by weighing and mixing large and small particles sifted by the vibrating sieving machine 4 in a suitable ratio, whereby the dry matter is The fuel generated by mixing appropriately can suppress the variation of the thermal energy generated in the combustion furnace 71 in the steam generation boiler 7.

The presently disclosed embodiments are illustrative in all respects and not restrictive of interpretation. The technical scope of the present invention is not interpreted only by the embodiments described above, but is defined based on the description of the claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the claims.

This application claims priority based on Japanese Patent Application No. 2017-167134 filed in Japan on August 31, 2017. By reference to this, the entire content of which is incorporated into the present application.

Industrial Applicability The present invention has high industrial applicability because the object to be treated including organic waste can be processed using a fermentation drying apparatus and the resulting dried product can be easily used as a fuel.

1 Crusher (crusher)
3 Fermentation dryer 30 tank (closed container)
4 Vibrating sieve (classifier)
5 Re-entry line (re-entry device)
DESCRIPTION OF SYMBOLS 6

Storage device

61,62 Storage hopper 63,64 Weighing supply device 7 Steam generation boiler (heating device)

Claims

An object to be treated including an organic waste is housed in a closed vessel, stirred while heating to a predetermined temperature range under reduced pressure, fermented by utilizing microorganisms, and fermented to obtain a reduced-volume dried product. A device,
A classification device for classifying the dried product obtained by the fermentative drying device into relatively large particles and relatively small particles;
And a storage device for temporarily storing the large particles and the small particles, respectively.
In the fueling device by fermentation and drying of the object to be treated according to claim 1,
The classification device is configured to divide the dry matter into the large particles, the small particles, and the medium particles having an intermediate size,
A refueling apparatus by fermentation and drying of an object to be treated, comprising: a re-introduction device for reintroducing the medium-sized matter into the closed container in order to process the medium-sized matter again in the fermentation and drying apparatus.
In the fueling apparatus by fermentation drying of the processing object according to claim 1 or 2,
A fueling device by fermentation and drying of the object to be treated, comprising a crushing device for crushing the object to be treated in a closed container of the fermentation and drying device in a preliminary step.
In the fueling device by fermentation and drying of the object to be treated according to any one of claims 1 to 3,
A combustion furnace for burning the large particles and small particles;
A metering supply device for taking out the large particles and small particles from the storage device and adjusting the mixing ratio thereof so as to maintain a constant amount of heat generated in the combustion furnace; A fueling device by fermentative drying of an object to be treated characterized in that.
Using the fueling device by fermentative drying of the processing object according to claim 1,
An object to be treated including an organic waste is housed in a closed vessel, stirred while heating to a predetermined temperature range under reduced pressure, fermented by utilizing microorganisms, and fermented to obtain a reduced-volume dried product. Process,
A classification step of classifying the dried product obtained by the fermentation and drying step into relatively large large particles and relatively small small particles;
And a storage step of temporarily storing the large particles and the small particles, respectively, and producing a fuel by fermentation drying of the object to be treated.