JP2008064345A - Drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying device capable of improving drying efficiency of a drying object by improving condensation efficiency of a gas without increasing the size of the drying device. <P>SOLUTION: This drying device 1 comprises a casing 10 provided with a steam heating device 12c on a lower wall, a rotating body 20 rotatably disposed inside of the casing 10 and stirring the dried object, and a scraping-off portion 40 mounted on an outer peripheral portion of the rotating body 20 to scrape off the deposit attached to an inner face of the casing 10. The dried object in the casing 10 includes micro-organism having prescribed enzyme. A heat exchanging portion 50 condensing the steam generated from a dried material in a drying process and discharging the condensate water G is disposed at an upper part of the casing 10. The condensate water G produced at the heat exchanging portion 50 is sucked by a vacuum pump with the air inside of the casing, and supplied to a cooling tower 60. Odor components in the condensate water G is decomposed by the micro-organism included in the cooling water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drying apparatus, and more particularly to a drying apparatus suitable for an object to be dried mainly containing organic matter such as garbage.

  Conventionally, as this type of drying apparatus, garbage is heated in a drying tank, and the gas generated as the garbage is dried is cooled and condensed by a condenser to produce a condensate. There is one that performs microbial treatment (see, for example, JP-A-8-136135: Patent Document 1).

The said drying apparatus heats garbage with the heating jacket provided in the side surface of the drying tank, and guides the gas from garbage to a condenser via the connection pipe connected to the upper end part of the drying tank. In the condenser, the gas is cooled and condensed by a heat exchanger to which cooling water is supplied to generate a condensate, and the condensate is stored in the condenser. A condensate is guided to a recovery tank through a discharge pipe connected to the condenser, and a microbial solution is supplied to the recovery tank so that odor components of the condensate are decomposed and removed by microorganisms. The treated liquid that has undergone the microbial treatment is discharged from the recovery tank to the outside of the drying apparatus.
JP-A-8-136135

  However, the conventional drying apparatus has a problem that the gas condensing efficiency is relatively low because the gas generated in the drying tank is led to a condenser separate from the drying tank for condensation. If it is going to increase the condensation efficiency of gas, since it is necessary to enlarge the condenser separately from a drying tank, the enlargement of a drying apparatus will be caused.

  Moreover, since the said conventional drying apparatus only heats the raw garbage in a drying tank, without performing microbial treatment, raw garbage tends to rot. Therefore, there is a problem that the odor component of the condensed water tends to increase and the load of microbial treatment in the recovery tank tends to increase. In order to cope with an increase in the load of microbial treatment, it is necessary to increase the size of the recovery tank, which leads to an increase in the size of the drying device.

  Furthermore, when the load of microbial treatment in the recovery tank increases, the removal efficiency of odorous components decreases, and as a result, odorous components remain in the treated liquid discharged to the outside of the drying device, which adversely affects the surrounding environment. There is a risk of giving.

  Further, in the above conventional drying apparatus, the heating temperature of the object to be dried in the drying tank is likely to be high, thereby easily destroying nutrient substances such as vitamins contained in the object to be dried. When using dry matter for feed or fertilizer, there is a problem that the quality tends to be lowered.

  Therefore, the object of the present invention is to improve the gas condensation efficiency without increasing the size and improve the drying efficiency of the material to be dried, reduce the load of microbial treatment, and reduce the discharge of untreated components to the outside. Another object of the present invention is to provide a drying device that can use the processed material to be dried as high-quality feed or fertilizer.

In order to solve the above problems, the drying apparatus of the present invention comprises:
A casing for containing the material to be dried;
A heating unit provided in the casing for heating the material to be dried;
A heat exchanger provided in the casing, to which cooling water is supplied, a condensing unit for condensing a gas generated along with drying of the object to be dried to generate a condensate;
A vacuum pump that sucks the air in the casing together with the condensate generated in the condensing unit and depressurizes the casing;
Cooling water from the heat exchanger of the condensing unit and the condensate sucked by the vacuum pump are led, and a cooling unit for cooling the cooling water mixed with the condensate,
A cooling water pump for returning the cooling water cooled in the cooling unit to the condensing unit,
The to-be-dried object and the cooling water contain a microorganism having a predetermined enzyme.

  According to the said structure, the to-be-dried object in a casing is heated by a heating part, and the gas produced when this to-be-dried object is heated and dried is condensed by the said condensation part. Since the heating unit and the condensing unit are provided in the casing, the gas generated by heating the object to be dried by the heating unit is quickly condensed in the condensing unit. Therefore, it is possible to condense the gas generated from the object to be dried more efficiently than when the gas generated in the drying tank is led to the condenser separate from the drying tank as in the prior art. And since the said heating part and a condensation part are provided in the casing, size reduction of a drying apparatus can be achieved.

  The condensate produced in the condensing part is sucked together with the air in the casing by a vacuum pump and guided to the cooling part. In this cooling unit, the condensate is mixed with cooling water from the heat exchanger of the condensing unit and cooled. Here, although the odor component etc. are mixed in the said condensate, this odor component etc. are decomposed | disassembled and removed by the microorganisms contained in the said cooling water. Further, the concentration of the odor component or the like contained in the condensate is reduced when the condensate is mixed with the cooling water. In addition, since the to-be-dried material in the casing also contains microorganisms, the to-be-dried material is prevented from decaying. As a result, the amount of odor components and the like mixed in the condensate is relatively small. Thereby, the load of the microbial treatment with respect to the said condensate and cooling water can be reduced effectively. As a result, the processing efficiency by microorganisms can be improved without increasing the size of the drying apparatus. As a result, the unprocessed component in the condensate is discharged to the outside of the drying apparatus, and the disadvantage that adversely affects the surrounding environment can be prevented. The microorganism is a microorganism having a predetermined enzyme corresponding to the substance to be decomposed. For example, a microorganism having an ammonia-degrading enzyme as an odor component, a microorganism having an alcohol-degrading enzyme, a microorganism having a lactose-degrading enzyme, etc. It is. Moreover, the component decomposed | disassembled by the said microorganisms is not restricted only to organic substance, An inorganic substance is also contained.

  Moreover, since the inside of a casing reduces pressure by the said vacuum pump, since the boiling point of the water | moisture content in a to-be-dried material and a volatile component falls, the drying efficiency of to-be-dried material can be improved, reducing the heating temperature by the said heating part. Thereby, destruction of nutrient substances, such as vitamins, in a thing to be dried can be prevented, and when using a thing to be dried after processing for feed and fertilizer, high quality feed and fertilizer are obtained. Furthermore, since the killing of microorganisms due to the high temperature can be prevented, it is possible to prevent the degradation of the ability to decompose the material to be dried in the casing.

  Furthermore, since the condensation temperature of the gas from the object to be dried is reduced by the reduced pressure in the casing, the temperature rise of the cooling water that exchanges heat with the gas in the heat exchanger can be reduced. As a result, since the microorganisms contained in the cooling water can be prevented from being killed due to high temperature, it is possible to effectively prevent a decrease in the ability of the microorganism treatment for the condensate and the cooling water.

In the drying apparatus according to an embodiment, the casing has a horizontally long cylindrical shape, and the supply object supply unit is provided at one end, and the discharge object discharge unit is provided at the other end. Is provided,
In the casing, a shaft portion that extends substantially parallel to the longitudinal direction of the casing and is driven to rotate about the major axis, and a feeding portion that feeds the material to be dried from one end portion to the other end portion of the casing And a stirrer having a scraping part that scrapes off deposits adhering to the inner surface of the casing.

  According to the embodiment, the material to be dried put into the casing from the supply part at the one end is sent to the discharge part at the other end by the feed part of the stirring part while being heated by the heating part. It is done. Thereby, drying and microbial decomposition of a to-be-dried material are accelerated | stimulated.

  In addition, on the inner side surface of the casing, adherence of an object to be dried tends to occur near the heating unit. Here, the scraping part of the agitation part scrapes off deposits on the inner surface of the casing, thereby preventing the object to be dried from burning on the inner surface of the casing.

  In one embodiment, the heating unit has a hollow chamber formed in the lower wall of the casing and supplied with a heat medium.

  According to the said embodiment, a heat medium is supplied to the hollow chamber of the said heating part, and, thereby, the to-be-dried material located in the lower part in the said casing is heated. In addition, as said heat medium, hot water, water vapor | steam, oil, etc. can be suitably selected according to preset temperature or preset capacity | capacitance.

  In the drying apparatus according to one embodiment, the stirring unit includes an auxiliary heating unit that heats the workpiece.

  According to the said embodiment, in addition to the heating part provided in the casing, the drying efficiency of a to-be-dried object can be improved by heating a to-be-dried object with the auxiliary | assistant heating part provided in the said stirring part.

  In the drying apparatus according to an embodiment, the auxiliary heating unit includes a hollow chamber formed in the shaft portion and supplied with a heat medium.

  According to the said embodiment, a heat medium is supplied to the hollow chamber in the said axial part, and, thereby, the to-be-dried material near the axial part can be heated. In addition, as said heat medium, hot water, water vapor | steam, oil, etc. can be suitably selected according to preset temperature or preset capacity | capacitance.

In one embodiment of the drying device, the feeding unit of the stirring unit is formed of a helical tube disposed around the shaft unit,
The auxiliary heating unit includes a hollow chamber formed in the spiral tube and supplied with a heat medium.

  According to the said embodiment, a to-be-dried object can be efficiently sent toward the other end part from the one end part of a casing with the said spiral tube. Furthermore, a heat medium is supplied to the hollow chamber in the spiral tube, whereby the object to be dried in the vicinity of the spiral tube can be heated. Since the spiral tube has a spiral shape, the contact area with respect to the object to be dried can be increased and the heating efficiency of the object to be dried can be increased as compared with the cylindrical shape. In addition, as said heat medium, hot water, water vapor | steam, oil, etc. can be suitably selected according to preset temperature or preset capacity | capacitance.

In a drying apparatus according to an embodiment, the condensing unit includes a cooling water pipe as the heat exchanger provided inside the upper portion of the casing, and a receiver that is provided below the cooling water pipe and receives the condensate. A liquid part,
The suction port of the vacuum pump is formed so as to face the inside of the liquid receiving part of the condensing part.

  According to the embodiment, the gas generated from the material to be dried in the casing is quickly condensed by the cooling water piping of the casing, and the condensate that is deposited and dropped on the surface of the cooling water piping is received by the receiving device. Receive in the liquid part. The air and the condensate in the casing can be effectively discharged to the outside of the casing from the intake port facing the inside of the liquid receiving portion by a vacuum pump.

In one embodiment, the cooling unit includes:
A lower part where the cooling water mixed with the condensate flows,
A fan that sends wind to the cooling water flowing through the lower part,
A water tank section for receiving cooling water from the lower part,
It is an air-cooling type cooling tower having a pump for guiding the cooling water accumulated in the water tank part to the lower part.

  According to the embodiment, in the air-cooled cooling tower, the cooling water mixed with the condensate is cooled by being sent from the fan when flowing through the lower part. Further, the cooling water mixed with the condensate circulates in the lower part and the water tank part, so that the microbial treatment of, for example, odor components in the condensate can be performed over a relatively long time. Moreover, it can be made to act as a scrubber when the cooling water which flows through the said lower part contacts the air guide | induced with the condensate from the inside of a casing. Thereby, the gaseous odor component etc. which are contained in the air in a casing can be dissolved in cooling water, and can be decomposed and removed by the microorganisms contained in this cooling water.

  In addition, it is preferable that the said flow part has a filler, such as a porous resin, for example, and can function as a support | carrier of microorganisms. Moreover, you may provide the catalyst which decomposes | disassembles an odor component and a harmful | toxic component, for example in the said lower flow part or a water tank part.

  In one embodiment of the drying apparatus, the microorganism is alcohol dehydrogenase, lactate dehydrogenase, glucose 6-phosphate dehydrogenase, aldehyde dehydrogenase, L. aspartate, beta-semialdehyde, NADP oxide. Rectase, glutamate dehydrogenase, aspartate semialdehyde dehydrogenase, NADPH2 cytochrome C-reactase, glutathione dehydrogenase, trehalose phosphate synthetase, polyphosphae kinase, ethanolamine phosphate Cytidyl transferase, trehalose phosphatase, metalthiophospho glycerate phosphatase, inulase, β-mannositase, uridine nucleositase Cytosine diaminase, methylcysteine synthetase, aspartate synthetase, succinate dehydrogenase, aconitinate hydrogenase, fumarate hydrogenase, maleate dehydrogenase, citrate synthetase, isocitrate dehydrogenase, LSNADPoxy At least one enzyme selected from the group consisting of a ductase, a monoamine oxidase, a histamine, a pyruvate decarboxylase, an ATPase, a nucleotide pyrophosphatase, an endopolyphosphatase, an ATP phosphohydrolase, and an orotidine 5-phosphate decarboxylase It has a microorganism.

  According to the above embodiment, among the microorganisms having the respective enzymes, microorganisms having enzymes corresponding to substances contained in the to-be-dried object and the condensate act on the material to be dried and the condensate. A wide variety of materials to be dried can be decomposed. Here, microorganisms having many kinds of enzymes can be secured by using microorganisms derived from indigenous bacteria in the natural environment of the sea, mountains, and land.

  First, the whole structure of the drying apparatus 1 of the present invention will be described with reference to FIG. The drying device 1 includes a heating unit H1 (heated steam as a heating medium is supplied from the boiler 5 and returns the heated steam to the boiler 5) on the peripheral wall 12a of the lower casing 12, and one end (upstream) of the upper casing 11 is provided. A laterally long cylindrical casing 10 having a supply part 11a for a dried object W such as garbage on the side) and a discharge part 12b for the dried material w on the other end part (downstream side) of the lower casing 12; , A stirring rod 22 with a feeding portion that feeds the material to be dried W supplied inside the casing 10 from the one end portion to the other end portion while stirring during rotation, and bearings 30 on both end walls of the casing, 35, a rotating body 20 supported by 35, an inverter motor M that rotationally drives the rotating body 20 in the feeding direction, and an adhesion adhered to the inner surface of the peripheral wall 12a of the lower casing 12. A scraping unit 40 attached to the outer periphery of the rotating body 20 so as to scrape off, and a condensing unit 50 for condensing the steam S generated from the material to be dried W during the drying process in the casing and discharging the condensed water G. The vacuum pump VP for sucking the air inside the casing together with the steam S from the material to be dried W through the discharge pipe 59 for the condensed water G of the condensing unit 50 and the cooling water supplied to the condensing unit 50 by the cooling water pump P The cooling tower 60 is configured to be cooled with air and held in the water tank 61 and supplied from the discharge pipe 59 with the condensed water G sucked by the vacuum pump VP and the air.

  In the drying apparatus 1 of the present invention, the material to be dried W supplied from the supply unit 11a into the horizontally long cylindrical casing 10 is rotationally driven toward the discharge unit 12b while being heated by the heating unit H1 of the lower casing 12. It is sent by the feeding part of the rotating body 20 to be performed. In the meantime, the to-be-dried object W receives the heating from the outside by the heating part H1 of the lower casing 12 and the heating from the inside by the auxiliary heating part H2 provided in the rotating body 20, and further rotates the stirring rod with a feeding part. Drying is much faster due to the stirring by No. 22. Further, since the inside of the casing is in a negative pressure state by the vacuum pump VP, the boiling point of the water in the material to be dried W is lowered (for example, 70 ° C. at 320 hPa), the boiling evaporation of the water is promoted, and the drying is further performed. Get early. In this case, even when saturated steam is supplied to the heating unit H and the heating temperature does not reach 100 ° C., boiling evaporation of moisture inside the casing is promoted.

  In addition, it is preferable to adjust the pressure reduction amount in the casing 10 according to the kind of to-be-dried object. For example, when the object to be dried is garbage or food waste, the pressure is reduced from atmospheric pressure to 400 hPa. Thereby, since the boiling point of the water in to-be-dried material reduces to about 80 degreeC, destruction of the nutrient component accompanying the heating of to-be-dried material can be prevented. Therefore, a high quality feed and fertilizer can be manufactured using the to-be-dried material after a process. On the other hand, when the material to be dried has a large amount of water such as shochu or human feces, the pressure is reduced from atmospheric pressure to 700 to 800 hPa. Thereby, since the boiling point of the water in a to-be-dried material reduces to about 60 degreeC, the water | moisture content in to-be-dried material can be evaporated efficiently and a drying process can be performed rapidly.

  The steam S generated by the evaporation of moisture in the object to be dried W is condensed by the condensing unit 50 and discharged as condensed water G from the inside of the casing, so that the object to be dried w after treatment is wetted again or moistened. There is no. Moreover, since the heating part H1 is arrange | positioned in the casing 10 and the auxiliary | assistant heating part H2 and the condensation part 50 are arrange | positioned in the casing 10, the to-be-dried material is heated, and the gas produced is condensed quickly and efficiently. Can do. In addition, the entire drying apparatus can be reduced in size.

  Further, even when the object to be dried burns or adheres to the inner wall surface of the lower casing 12 heated by the heating unit H1, the object to be dried in the vicinity of the inner wall surface is removed by the scraping unit 40 attached to the outer peripheral part of the rotating body 20. Can be scraped off. As a result, it is possible to prevent the disadvantage that the amount of heat transmitted by the deposits decreases and the heating efficiency by the heating part H1 decreases. In the heating part H1, electric heating is possible in addition to steam heating, but a steam heating method that is advantageous in terms of running cost is preferable in food processing plants and the like. In addition, although saturated water vapor | steam was supplied to the said heating part H1 and the auxiliary | assistant heating part H2, other heat media, such as superheated steam, hot water, or oil, may be supplied.

  2 and 3 are diagrams showing the drying apparatus 1 in detail. In the drying apparatus 1, the casing 10 includes a bottom casing 12 having a U-shaped cross section having a bottom portion having a circular cross section, a discharge portion 12 b of the dried material w, and bearings 30 and 35. The lower casing 12 is connected with a bolt so as to be openable so as to cover the lower casing 12 and is composed of an upper casing 11 having an inverted U-shaped cross section having the supply part 11a for the object to be dried W.

  An aerobic thermophilic complex bacterium obtained from an indigenous bacterium is added to the organic material to be dried W put into the casing 10, and the decomposition of the organic matter that is likely to be spoiled can be promoted. Specifically, the material to be dried W contains a microorganism having at least one of the following enzymes. 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 plurality of types of microorganisms containing a plurality of enzymes among these in the material to be dried W, it is possible to perform a decomposition process on the various types of materials to be dried W. As these multiple types of microorganisms, it is preferable to use native bacteria in the natural environment of the sea, mountains and land.

  The rotating body 20 includes a hollow rotating shaft 21, a hollow stirring rod 22 that is spirally spaced in the longitudinal direction at a pitch of 90 degrees around the rotating shaft 21, and radially protrudes, and is mounted around the stirring rod 22. And a heat sink 23 that is inclined so as to constitute a feeding portion, and a scraping scraper 40 attached to the outer end of the stirring rod 22, and the inverter motor M in the rotational direction in which the feeding is applied. It is comprised so that it may be rotationally driven by. The hollow rotary shaft 21 has a plurality of holes 21a and 21b in the peripheral direction at positions corresponding to the steam intake / discharge holes of the sleeve portions 30b and 35b at the upstream end and the downstream end. As shown in FIGS. 5 (a) and 5 (b), the scraper 40 includes an attaching portion 40a to the stirring rod 22 and a scraping portion 24b having an inclined blade so as to feed the scraped material. Have. The scraping portion 40b is formed in two places so that when one is worn, the other can be used.

  The heating part H1 on the casing side includes a steam supply pipe 31 that supplies superheated or saturated steam generated from the boiler 5 to the hollow steam chamber 12c formed inside the peripheral wall of the lower casing 12 through bearings 30 and 35. The steam exhaust pipe 36 for returning the heated steam to the boiler 5 is connected. The auxiliary heating unit H2 on the rotating body side is provided with bearings 30 and 35 for superheated or saturated steam from the steam supply pipe 31 to the rotating shaft steam chamber 21c and the stirring rod steam chamber 22c of the hollow steam chamber formed inside the rotating body 20. The heated steam is returned to the boiler 5 through the steam discharge pipe 36. A drain pipe 12e with a valve is connected to the lowest part of the hollow steam chamber 12c. The upstream bearing 30 has a sleeve portion 30 b that supports the rotary shaft 21 in a cylindrical housing 30 a connected to the steam supply pipe 31. The interior of the housing 30a communicates with the rotary shaft steam chamber 21c through a plurality of holes around the sleeve portion 30b and also communicates with the hollow steam chamber 12c on the peripheral wall of the lower casing 12. The downstream bearing 35 can also have the same structure as the upstream bearing 30 (the through hole of the shaft 21 is closed with a closing flange), and the connection to the steam supply pipe 31 can be a connection to the steam discharge pipe 36. . In the illustrated example, the downstream bearing 35 has a sleeve portion 35b that supports the rotary shaft 21 in a cylindrical housing 35a, and the inside of the housing 35a has a plurality of holes around the sleeve portion 35b. And communicates with the hollow steam chamber 12c on the peripheral wall of the lower casing 12. When the downstream side bearing 35 is not provided with the steam exhaust pipe 36 unlike the upstream side bearing 30, the steam exhaust pipe 36 ′ can be connected to the hollow steam chamber 12 c on the peripheral wall of the lower casing 12.

  The condensing parts 50 are formed on both end walls of the upper casing 11, respectively, a supply water chamber 11 b to which cooling water is supplied by the supply pump P, a discharge water chamber 11 c that receives and discharges the cooled water, and a supply water chamber. 11b and the discharge water chamber 11c, with one end and the other connected to each other, a plurality of cooling water pipes 53 provided in the longitudinal direction of the casing in the water collection part 51, and a discharge for discharging the condensed water G from the water collection part 51. An outlet 59 and a bowl-shaped water collecting portion 51 of condensed water G provided in the longitudinal direction of the casing along both side edges of the upper casing 12 between the supply water chamber 11b and the discharge water chamber 11c. The water collecting unit 51 collects condensed water G that is cooled and condensed on the inner surface of the upper casing 11 in addition to the condensed water G by the cooling water pipe 53.

  The cooling tower 60 is supplied with condensed water G and air sucked from the discharge port 59 by the vacuum pump VP. The cooling tower 60 cools the cooling water received from the discharge water chamber 11c with wind, and supplies the cooled cooling water to the supply pump P. Moreover, in the cooling tower, in addition to cooling the cooling water, the condensed water is decomposed.

  The cooling tower 60 includes a nozzle 62 for injecting cooling water, a flow lower part 63 to which the cooling water injected from the nozzle 62 flows down, a fan 64 for sending air to the cooling water flowing through the flow lower part 63, and the flow down 63. The water tank part 61 which receives the cooling water which flowed through is provided. The water tank 61 is connected to a cooling water pipe from which the cooling water is led from the condensing part 50 and a condensed water pipe from which the condensed water is led from the vacuum pump VP. A dust separator is interposed in the condensed water pipe. One end of a watering pipe provided with a watering pump 65 is opened in the water tank portion 61, and the other end of the watering pipe is connected to the nozzle 62. In the flow lower part 63, a porous filler made of resin is disposed. In the cooling tower 60, the condensed water guided to the water tank unit 61 is mixed with the cooling water, and the cooling water mixed with this condensed water is guided to the nozzle 62. When the cooling water sprayed from the nozzle 62 flows through the lower part 63, the temperature is lowered by the wind from the fan and flows into the water tank unit 61. The cooling water cooled by the cooling tower 60 is returned to the condensing unit 50 by the cooling water pump P.

  The cooling water circulating between the cooling tower 60 and the condensing unit 50 contains a plurality of types of microorganisms. The microorganisms contained in the cooling water are the same as the microorganisms contained in the material to be dried W in the casing 10 described above. The microorganisms in the cooling water decompose and remove odor components and water-soluble harmful substances contained in the condensed water G. The decomposition of odor components and the like by the microorganisms is widely performed in a cooling water circulation path formed between the cooling tower 60 and the condensing unit 50. In particular, it is preferable to use the filler in the lower part 63 as a carrier for microorganisms and promote microbial degradation in the lower part 63.

Since the drying apparatus of this embodiment reduces the density | concentration of an odor component etc. as a whole by mixing the condensed water G with cooling water, even if the odor component etc. of the condensed water G increase, there exists a possibility that it may exceed the processing capacity of microorganisms. Less, stable microbial treatment can be performed. Moreover, since the inside of the casing 10 is depressurized, the temperature rise of the cooling water when the cooling water exchanges heat with the gas in the condensing unit 50 is relatively small, and the temperature of the cooling water is approximately 40 to 45 ° C. . Thereby, the inconvenience that the microorganisms in cooling water die by high temperature is prevented, the microorganisms are stably activated, and the condensed water G can be stably treated with microorganisms. Further, in the cooling tower 60, since the evaporation of the cooling water is promoted, the overflow hardly occurs. Moreover, the odor components and the like in the condensed water G are diluted with cooling water and are highly decomposed and removed. Therefore, it is possible to effectively prevent the disadvantage that odor components and harmful components are discharged outside the drying apparatus. Also,
The air in the casing 10 is guided to the water tank 61 together with the condensed water via the condensed water pipe by the vacuum pump VP. Odor components and the like contained in the air guided to the water tank unit 61 are dissolved in contact with the cooling water in the water tank unit 61 or the cooling water dripped from the lower part 63, and are decomposed and removed by microorganisms of the cooling water. The As described above, the cooling tower 60 also functions as a scrubber for air guided from the casing 10.

  Further, since the condensed water G is replenished in the cooling tower 60, the amount of replenished fresh water g to the water tank 61 can be reduced. The condensed water G is supplied to the water tank 61 after passing through a dust separator (not shown). The water tank 61 may be provided with a catalyst for removing odor components and predetermined components. Further, the catalyst may be included in the filler of the lower flow 63.

  The drying apparatus 1 of the present invention makes the microorganism treatment in both the material to be dried W and the cooling water effective by reducing the pressure inside the casing 10 with the vacuum pump VP. That is, the inside of the casing 10 is depressurized, and the boiling point of water mainly contained in the object to be dried W is made lower than 100 ° C., thereby preventing the death of microorganisms accompanying the heating of the object to be dried W. At the same time, the condensation temperature of the gas in the condensing unit 50 is lowered to reduce the temperature rise of the cooling water that exchanges heat with the gas in the condensing unit 50, thereby preventing the death of microorganisms due to the temperature rise of the cooling water. . As a result, it is possible to prevent the to-be-dried object W from being spoiled and suppress the generation amount of odorous components and the like, and to improve the decomposition and removal efficiency of odorous components and the like.

  Further, by lowering the heating temperature of the object to be dried W by reducing the pressure in the casing 10, it is possible to prevent destruction of nutrient components such as vitamins contained in the object to be dried W. As a result, high quality feed and fertilizer can be manufactured using the to-be-dried material W after processing.

  FIG. 4 is a diagram illustrating a modified example of the rotating body. The rotating body 20 ′ is formed by providing a spiral tube 22 ′ around the hollow rotating shaft 21 ′ instead of the stirring rod 22. The rotating body 20 ′ is wound around the hollow rotating shaft 21 ′ in a spiral shape so that one end and the other end are connected to the hollow portion and the feeding portion is formed around the rotating shaft 21 ′. A spiral tube 22 ′ and a scraping portion 40 attached to the outer peripheral surface of the spiral tube, and a hollow steam chamber is constituted by a rotary shaft hollow portion 21c ′ and a spiral tube hollow portion 22c ′. ing. The scraper 40 is attached to the tip of a rod 25 that protrudes from the outer periphery of the helical tube 22 'at a pitch of 90 degrees in the circumferential direction and at a helical pitch in the longitudinal direction. The spiral tube 22 ′ is divided into two blocks A and B in the longitudinal direction in order to prevent a significant decrease in the heating capacity on the downstream side, and the upstream ends of the spiral tubes of the respective blocks A and B have the same high temperature. The rotary shaft 21 ′ is connected to the upstream portion 21c ″ of the rotary shaft steam chamber 21c ′ so as to take in the heated steam, and the downstream end is connected to the rotary shaft steam chamber 21c ′. Further, the upstream side of the spiral tube 22 ′. By providing the stirring rod 22 and the heat dissipating plate 23 that is attached around the stirring rod and that constitutes the feeding portion over one circumference on both outer sides of one end portion and the other end portion on the downstream side, the object to be dried W The intake capacity and the discharge capacity can be enhanced at the supply section 11a and the unloading section 12b.

  As an application example of the present invention, the present invention can be applied to drying of inorganic dried materials such as pellets and sand after washing in addition to dried materials of organic waste such as garbage, shochu residue, and sludge.

It is a schematic block diagram which shows the drying apparatus of this invention. It is a longitudinal cross-sectional view which shows the principal part of the drying apparatus of this invention. FIG. 3 is a transverse sectional view showing a section taken along line III-III in FIG. 2. It is a longitudinal cross-sectional view which shows the modification of a rotary body. FIGS. 5A and 5B are side views showing examples of the scraping portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drying apparatus 5 Boiler 10 Casing 11 Upper casing 11a Drying substance supply part 11b Supply water chamber 11c Drain water chamber 12 Lower casing 12b Drying material discharge part 12c Lower casing side hollow steam chamber 20 Rotating body 21 Rotating shaft 21 'Rotary shaft 21c Rotating shaft hollow portion 21c' Rotating shaft hollow portion (steam discharge section)
21c "Steam supply portion 22 Stirring rod 22c Hollow portion of stirring rod 22 'Spiral tube 22c' Hollow portion of spiral tube 23 Heat sink 30 Bearing 31 Steam supply tube 35 Bearing 36 Steam discharge tube 40 Scraping portion 50 Heat exchange portion 51 Collection Water part 53 Cooling water pipe 59 Condensate discharge part 60 Cooling tower 61 Water tank part 62 Nozzle 63 Lower part 64 Fan 65 Sprinkling pump A A spiral block upstream block B A spiral pipe downstream block G Condensate H1 heating part H1 Auxiliary heating part M Motor P Cooling water pump S Steam from the object to be dried VP Vacuum pump W Object to be dried w Object to be dried after treatment

Claims (9)

A casing for containing the material to be dried;
A heating unit provided in the casing for heating the material to be dried;
A heat exchanger provided in the casing, to which cooling water is supplied, a condensing unit for condensing a gas generated along with drying of the object to be dried to generate a condensate;
A vacuum pump that sucks the air in the casing together with the condensate generated in the condensing unit and depressurizes the casing;
Cooling water from the heat exchanger of the condensing unit and the condensate sucked by the vacuum pump are led, and a cooling unit for cooling the cooling water mixed with the condensate,
A cooling water pump for returning the cooling water cooled in the cooling unit to the condensing unit,
The drying apparatus, wherein the object to be dried and the cooling water contain microorganisms having a predetermined enzyme. The drying apparatus according to claim 1, wherein
The casing has a horizontally long cylindrical shape, and is provided with a supply unit for the material to be dried at one end and a discharge unit for the material to be dried at the other end.
In the casing, a shaft portion that extends substantially parallel to the longitudinal direction of the casing and is driven to rotate about the major axis, and a feeding portion that feeds the material to be dried from one end portion to the other end portion of the casing And a stirrer having a scraping unit that scrapes off deposits adhering to the inner surface of the casing. The drying apparatus according to claim 1, wherein
The drying apparatus, wherein the heating unit includes a hollow chamber formed in the lower wall of the casing and supplied with a heat medium. The drying apparatus according to claim 2,
The said stirring part has an auxiliary | assistant heating part which heats the said to-be-processed object, The drying apparatus characterized by the above-mentioned. The drying apparatus according to claim 4, wherein
The drying apparatus, wherein the auxiliary heating unit includes a hollow chamber formed in the shaft portion and supplied with a heat medium. The drying apparatus according to claim 4, wherein
The feeding part of the stirring part is formed by a helical tube arranged around the shaft part,
The drying apparatus, wherein the auxiliary heating unit includes a hollow chamber formed in the spiral tube and supplied with a heat medium. The drying apparatus according to claim 1, wherein
The condensing part has a cooling water pipe as the heat exchanger provided inside the upper part of the casing, and a liquid receiving part provided below the cooling water pipe for receiving the condensate,
The drying device, wherein an intake port of the vacuum pump is formed so as to face the inside of the liquid receiving part of the condensing part. The drying apparatus according to claim 1, wherein
The cooling part is
A lower part where the cooling water mixed with the condensate flows,
A fan that sends wind to the cooling water flowing through the lower part,
A water tank section for receiving cooling water from the lower part,
A drying apparatus, comprising: an air-cooled cooling tower having a pump for guiding cooling water accumulated in the water tank section to the lower part. The drying apparatus according to claim 1, wherein
The above microorganisms are alcohol dehydrogenase, lactate dehydrogenase, glucose 6-phosphate dehydrogenase, aldehyde dehydrogenase, L. aspartate, beta-semialdehyde, NADP oxidectase, glutamate dehydrogenase , Aspartate semialdehyde dehydrogenase, NADPH2 cyclochrome C-reactase, glutathione dehydrogenase, trehalose phosphate synthetase, polyphosphae kinase, ethanolamine phosphaeide cytidyltransferase, trehalose phosphatase , Metalthiophosphoglycerate phosphatase, inulase, β-mannositase, uridine nucleositase, cytosine diaminase Methylcysteine synthetase, aspartate synthetase, succinate dehydrogenase, aconitine hydrogenase, fumarate hydrogenase, maleate dehydrogenase, citrate synthetase, isocitrate dehydrogenase, LSNADP oxidase, monoamine It has at least one enzyme selected from the group consisting of oxyductase, histamine, pyruvate decarboxylase, ATPase, nucleotide pyrophosphatase, endopolyphosphatase, ATP phosphohydrolase, orotidine pentaphosphate decarboxylase And drying equipment.

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