JP4384378B2 - Organic waste drying apparatus and drying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an organic waste drying method and an improved drying apparatus.
[0002]
[Prior art]
Conventionally, as a method and apparatus for drying organic waste containing moisture, direct ventilation drying in which hot air is brought into contact with an object to remove moisture has been frequently used. In addition, a means for heating the object is used in combination, and steam, recovered heat of the incinerator, or the like is used as the heat source.
[0003]
These means are intended to remove moisture with a large amount of air under heating but under normal pressure, and a large amount of exhaust gas containing evaporated water is generated. Furthermore, when organic waste is dried, the generation of odor components is unavoidable, and as a result, the odor components are mixed into the above-described large amount of exhaust gas, resulting in a problem that the odor component is discharged as a large amount of odor-containing gas. . Moreover, in order to avoid it, it was necessary to perform the deodorizing combustion process by an incinerator.
[0004]
[Problems to be solved by the invention]
The present invention has been made to solve the above problems, and provides a drying apparatus and a drying method capable of drying organic waste containing moisture while minimizing the generation amount of odor-containing gas.
[0005]
[Means for Solving the Problems]
(First invention)
The above problem is a metal container that heats the supplied organic waste in a sealed state and vaporizes the contained water, and the upper part includes supply means connected to the organic waste supply feeder. and a gas discharge means connected to the self-intensifier, inside, arranged a stirring means, a bottom is formed in an inverted conical shape, in its lower end, by opening the shutoff cock being elevation operating A content discharge means for discharging dry matter is formed by utilizing the pressure difference between the internal pressure and the external pressure of the moisture vaporization container, and a moisture vaporization container provided with a heating means for heating the inside is provided on the side wall. The problem can be solved by the organic waste drying apparatus of the present invention.
This organic waste drying apparatus can be preferably embodied in a form in which a plurality of the water vaporization containers are provided so as to be capable of time difference operation.
[0006]
(Second invention)
Moreover, said problem can be solved also by the drying method of the organic waste of this invention characterized by repeating the following process.
(1) A waste supply step of supplying organic waste containing moisture to a moisture vaporization container and closing the moisture vaporization container. (2) The organic waste in the moisture vaporization container is heated to a range of 100 ° C. to 374 ° C. to vaporize the moisture, and the water vapor is adjusted so that the pressure inside the moisture vaporization container is equal to or lower than the saturated vapor pressure at the treatment temperature. Heating and adjusting process that discharges and adjusts. (3) A gas release step of maintaining the temperature condition and discharging the water vapor in the water vaporization container to reduce the internal pressure to the minimum pressure required for discharging the dry matter after the completion of the water vaporization. (4) A dry matter discharge step of opening the open / close stopper at the bottom of the moisture vaporization container and discharging the dry matter using a differential pressure between the internal pressure and the external pressure of the moisture vaporization container.
[0007]
In this organic waste drying method, dry matter discharged outside the moisture vaporization container is collected in a storage tank, exhaust gas discharged from the moisture vaporization container is cooled by a condenser, and condensed moisture is collected in a drain tank. Thus, the odor gas component after removing the water vapor can be preferably embodied in a form in which it is treated in the catalyst tower.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the organic waste drying method and drying apparatus according to the present invention will be described with reference to FIG. 1. First, the drying apparatus according to the first invention will be described.
[0009]
(First invention)
This drying apparatus is a system centered on a metal moisture vaporization container 1 that heats and vaporizes the supplied organic waste in a sealed state. The moisture vaporization container 1 includes a ceiling lid 11 and an inverted cone. It is comprised from the cylindrical side wall part 13 which has the shape bottom part 12. As shown in FIG.
[0010]
The ceiling lid portion 11 is provided with a supply port 14 connected to a supply feeder 21 for organic waste, which is an object to be processed, through a feeder 22. The supply port 14 can be sealed by an on-off valve 23 downstream of the supply machine 22.
[0011]
Further, the ceiling lid portion 11 is provided with a gas discharge port 15 connected to an automatic pressure regulator 41 including an automatic valve 41a. Note that the automatic pressure regulator 41 controls the discharge of the exhaust gas mainly composed of water vapor discharged from the moisture vaporization container. Then, the condensed moisture is led to the condenser 42 and cooled, and the condensed moisture is collected in the lower drain tank 43, and the gas component including the odor component which is removed from the moisture is led to the catalyst tower 44 to be processed and discharged. An exhaust system is provided.
[0012]
Next, a stirring blade 52 is disposed inside the moisture vaporization container 1 and is rotated by a stirring motor 51 disposed in the ceiling lid portion 11 so that the workpiece can be stirred.
In addition, a heater 61 for heating the interior up to 374 ° C., which is the critical temperature of water, is disposed on the outer periphery of the side wall 13 of the moisture vaporization container 1. In FIG. 1, the heater 61 is also arranged on the outer periphery of the bottom slope. A normal heating means such as electric resistance heating is applied to the heater 61.
[0013]
Further, the bottom portion 12 of the water vaporization container 1 is formed in an inverted conical shape whose diameter is reduced downward as described above, and a content discharge port 16 having an opening / closing stopper 71 that is operated up and down from the outside is formed at the lower end portion thereof. Has been. The content discharge port 16 is connected to the feeder tank 73 through the chute 72.
[0014]
Thus, a predetermined amount of organic waste supplied into the moisture vaporization container 1 can be heated to a predetermined temperature in a sealed state to vaporize the moisture. The dried product after the vaporization process is discharged out of the moisture vaporization container, temporarily stored in the feeder tank 73 , and sequentially collected in the storage tank 75 by the lower conveyor 74. .
[0015]
As described above, the organic waste drying apparatus of the present invention is an apparatus that batch-processes the objects to be processed by the moisture vaporization container 1, and therefore, the moisture vaporization container 1a similar to the moisture vaporization container 1 is used. If a plurality of moisture vaporization containers are provided side by side so that the time difference operation is possible, an advantage can be obtained that the apparatus can be set to a processing capacity according to demand.
[0016]
(Second invention)
Next, the organic waste drying method of the present invention will be described using the drying apparatus described above. The present invention is characterized in that the following steps (1) to (4) are repeated.
(1) Waste supply step A predetermined amount of organic waste containing water in the supply feeder 21 is supplied from the supply port 14 to the moisture vaporization container 1 via the supply device 22, and the path opening / closing valve 23 is closed. The backflow from the supply port 14 is sealed, and the water vaporization container 1 is closed. In this case, in the present invention, an object to be processed that has been dehydrated and concentrated to a maximum concentration of 20% as the solid content concentration of the organic waste can be applied. In addition, since the organic waste is supplied to the moisture vaporizing container 1 at normal pressure, there is an advantage that no special supply power is required.
[0017]
(2) Heating and regulating step The organic waste supplied into the moisture vaporization container 1 is heated to a predetermined temperature, for example, in the range of 100 ° C. to 374 ° C. by the heater 61, and the moisture contained in the organic waste is reduced. Vaporize. In this case, it is preferable to heat the moisture vaporization container 1 to a predetermined temperature in advance and supply organic waste therein to promote heating. Furthermore, it is preferable to disintegrate the contents and promote moisture vaporization by rotating the agitating blades 52 disposed in the lower part of the moisture vaporizing container 1 by the agitating motor 51 and agitating the workpiece.
[0018]
Thus, in the present invention, since the organic waste contains less water, there is an advantage that less energy is required for raising the temperature. As the temperature rises, the internal pressure of the container also rises. However, the automatic valve 41a of the automatic pressure regulator 41 connected to the gas outlet 15 is maintained at a saturated vapor pressure or lower, eg, 300 ° C. and 100 atm. To adjust the discharge of the generated water vapor.
[0019]
(3) Gas release step After the above-described moisture vaporization is completed, preferably the temperature condition is maintained, and the generated water vapor in the moisture vaporization container 1 is discharged from the gas discharge port 15 to reduce the internal pressure to a weak positive pressure. . In this case, it is preferable to adjust by opening and closing the bypass valve 41b of the path. Further, the internal pressure of the weak positive pressure may be set to the minimum pressure required for discharging the dried material described later. In this way, since the water in the water vaporization container is discharged as water vapor, only the powdered dry matter remains in the interior, and the advantage of facilitating subsequent processing can be obtained.
In the present invention, the moisture contained in the organic waste is discharged in the form of water vapor in the heating and pressure adjusting step and the gas releasing step, so that an exhaust gas composed of a large amount of drying air like a conventional dryer is generated. The advantage is that there is no.
[0020]
(4) Dry matter discharge process The opening / closing stopper 71 provided in the content discharge port 16 at the bottom of the water vaporization container 1 is opened, and the dry matter pulverized is discharged using the internal pressure of the weak plus pressure. Thus, the powdered dried product after moisture removal can be taken out only by the pressure difference between the inside and outside. The discharged dry matter is temporarily retained in the feeder tank 73 through the chute 72 and is collected in the storage tank 75 by the conveyor 74 as necessary.
[0021]
Further, in the organic waste drying method of the present invention, the water vapor discharged from the water vaporization container 1 is cooled by the condenser 42, and the water condensed by the condenser 42 is collected in the drain tank 43. Thus, the odor component contained in the gas from which moisture has been removed is preferably treated in the catalyst tower 44. In this way, if moisture is removed by the capacitor, the amount of gas containing the odor component becomes extremely small, so that there is an advantage that the deodorization treatment is facilitated.
[0022]
Moreover, since the drying method of the organic waste of this invention batch-processes a to-be-processed object by the said water vaporization container 1, as demonstrated above, the same water vaporization besides the said water vaporization container 1 is carried out. If a plurality of units are installed side by side so that the container 1a is installed side by side, an advantage that the processing capacity can be appropriately increased can be obtained.
[0023]
【The invention's effect】
Since the organic waste drying method and apparatus according to the present invention are configured as described above, the amount of odor-containing gas generated is not used when drying the moisture contained in the organic waste. Is controlled to a minimum, and a dry product can be obtained. Therefore, odor leakage can be prevented and deodorizing treatment can be extremely facilitated. Furthermore, if the discharged water vapor is condensed by a condenser, there are excellent effects such as the generation amount of odor-containing gas can be further reduced. Therefore, the present invention has an extremely large industrial value as a method and apparatus for drying organic waste that has solved the conventional problems.
[Brief description of the drawings]
FIG. 1 is a main part flow diagram of a drying apparatus for explaining the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Moisture vaporization container, 11 Ceiling cover part, 12 Bottom part, 13 Side wall part, 14 Supply port, 15 Gas discharge port, 16 Content discharge port, 21 Supply feeder, 22 Supply machine, 23 On-off valve, 41 Automatic pressure regulator, 41a Automatic valve , 42 condenser, 43 drain tank, 44 catalyst tower, 51 stirring motor, 52 stirring blade, 61 heater, 71 open / close stopper, 72 chute, 73 feeder tank

Claims (4)

It is a metal container that heats the supplied organic waste in a sealed state and vaporizes the contained water. At the top, it is connected to a supply means connected to the organic waste supply feeder and an automatic pressure regulator. The gas discharge means is provided, the stirring means is disposed inside, the bottom is formed in an inverted conical shape, and the internal pressure of the moisture vaporization container is opened at the lower end by opening an opening / closing stopper that is operated up and down. The content discharge means for discharging the dry matter is formed using the differential pressure between the external pressure and the external pressure, and the moisture vaporization container provided with the heating means for heating the inside is provided on the side wall. Organic waste drying equipment. The organic waste drying apparatus according to claim 1, wherein a plurality of the water vaporization containers are provided side by side so that a time difference operation is possible. A method for drying organic waste, characterized by repeating the following steps.
(1) A waste supply step of supplying organic waste containing moisture to a moisture vaporization container and closing the moisture vaporization container.
(2) The organic waste in the moisture vaporization container is heated to a range of 100 ° C. to 374 ° C. to vaporize the moisture, and the water vapor is adjusted so that the pressure inside the moisture vaporization container is equal to or lower than the saturated vapor pressure at the treatment temperature. Heating and adjusting process that discharges and adjusts.
(3) A gas release step of maintaining the temperature condition and discharging the water vapor in the water vaporization container to reduce the internal pressure to the minimum pressure required for discharging the dry matter after the completion of the water vaporization.
(4) A dry matter discharge step of opening the open / close stopper at the bottom of the moisture vaporization container and discharging the dry matter using a differential pressure between the internal pressure and the external pressure of the moisture vaporization container.   Oxidized gas after collecting the dry matter discharged outside the moisture vaporization container in a storage tank, cooling the exhaust gas discharged from the moisture vaporization container with a condenser, collecting the condensed moisture in a drain tank, and removing water vapor The method for drying organic waste according to claim 3, wherein the components are treated in a catalyst tower.

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