JP2003010812A - Garbage disposal method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage disposal method preventing a malodor from leaking by simply adjusting a pressure and a garbage disposal system. SOLUTION: This garbage disposal method comprises the steps to send water vapor (40) generated from garbage (2) in a disposal tank (4) to the outside of the disposal tank (4), and then condense the water vapor (40) there and send non-condensed gas (41) to the disposal tank (4) under pressure. The garbage disposal system, is equipped with a condensing means (a condenser 42), a circulating means (a circulation channel 44 and a circulation fan 70) and an exhaust means (an exhaust pipe 74). The internal pressure of the disposal tank (4) is maintained below an atmospheric pressure by sending a part (a gas 41B) of the gas to open air and releasing the pressure applied to the non-condensed gas. In the inside of the disposal tank (4) the pressure can be reduced regardless of the condensation function of the condensing means and the malodor leakage can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food waste treatment method and apparatus for heating food waste for drying treatment.

[0002]

2. Description of the Related Art Conventionally, a method for treating food waste has been put to practical use, in which the amount of food waste is reduced by heating and drying, and the dried product is reused as fertilizer. In this food waste treatment, a large amount of high-pressure steam is generated during heating and drying in the processing tank, and if this steam leaks from the processing tank, odor will be generated. Therefore, for the purpose of reducing the pressure inside the processing tank and preventing odor leakage, etc., high-pressure steam is guided from the processing tank to a condenser and condensed, and the gas after condensation is returned to the processing tank. The process is known.

[0003]

By the way, it is difficult to eliminate the high pressure on the processing tank side by reducing the pressure by condensation on the condenser side, and to bring the processing tank to a negative pressure, and the burden on the condenser side increases. If the decompression function on the condenser side is low, there is a risk that gas will leak from the drain pipe side that discards the condensed water, or the sealing of the lid of the high-pressure treatment tank will be impaired.

In order to eliminate such inconvenience, it is considered that a condenser having a large capacity is used or an exhaust passage is provided in the treatment tank so that the high pressure vapor in the treatment tank is deodorized and released to the outside air. To be However, deodorizing treatment is indispensable for flowing the steam that has not been subjected to the condensation treatment to the outside air. If the exhaust volume is large, a deodorizer with excellent deodorizing ability is required.

Therefore, it is an object of the present invention to provide a food waste processing method and an apparatus thereof for preventing odor leakage by simple pressure adjustment.

[0006]

According to the method of treating food waste of the present invention, steam (40) generated from food waste (2) in the treatment tank (4) by heat treatment is introduced outside the treatment tank to be condensed. A method for treating food waste by pressure-feeding the gas (41) after condensation to the treatment tank, by guiding a part of the gas (gas 41B) to the outside air together with the pressure-feeding pressure applied to the gas after condensation, It is characterized in that the internal pressure of the processing tank is maintained below atmospheric pressure. That is, since a part of the gas is guided to the outside air together with the pressure-feeding pressure applied to the gas after condensation, the inside of the processing tank is depressurized and the internal pressure of the processing tank is maintained below atmospheric pressure regardless of the condensing function of the condensing means. Can be made. Further, since such a pressure-feeding pressure is released to the outside air, the pressure reduction due to condensation is reduced, and the condensing means having a small capacity can be used.

In the method of treating food waste of the present invention, the gas introduced to the outside is deodorized. That is, although the odor of the condensed gas is greatly reduced by the separation of the condensed water, deodorization can be realized.

The garbage processing device of the present invention is a garbage (2)
Is heated in a treatment tank (4), and steam (40) generated from the garbage is condensed from the treatment tank (condenser 4).
2) A food waste treatment device configured to guide a gas (41) separated from condensed water (58) to a treatment tank by conducting the gas to the treatment tank, the gas being fed from the condensing means to the treatment tank. A circulation means (circulation path 44, circulation fan 70) for guiding and condensing the condensed gas (41) to the processing tank side, and a pressure-conveying pressure applied to the condensed gas by the circulation means together with the one of the gases. A portion (gas 41B) is introduced into the outside air, and an exhaust means (exhaust pipe 74) for maintaining the internal pressure of the processing tank at atmospheric pressure or less is provided.
That is, since a part of the gas is released from the circulation means to the outside air through the exhaust means together with the pressure-feeding pressure applied to the gas after the condensation, regardless of the condensation function of the condensation means, the pressure reduction inside the treatment tank is adjusted. The internal pressure of the processing tank can be maintained below atmospheric pressure, and the capacity of the condensing means can be reduced.

In the garbage processing apparatus of the present invention, the circulation means is a circulation fan (70) for generating the pumping pressure.
And the pumping pressure generated in the circulation fan is applied to the exhaust means. That is, a circulation fan is provided as a means for guiding the vapor generated in the processing tank to the condensing means and applying a pressure-feeding pressure to the condensed gas, and a part of the pressure-feeding pressure formed by the circulation fan is caused to act on the exhaust means. Therefore, the pressure in the processing tank can be reduced to the atmospheric pressure or lower, and the atmospheric air can be prevented from flowing back to the circulation means side through the exhaust means.

In the food waste processing apparatus of the present invention, the exhaust means is provided with a deodorizing means (deodorizer 76). That is, deodorization can be performed by performing deodorization treatment on a gas whose odor is significantly reduced by separating condensed water. Further, since the exhaust gas is condensed, the deodorizing means need not have a large capacity as in the conventional case.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention and its embodiments will be described below in detail with reference to the examples shown in the drawings.

1 to 3 show an embodiment of a method for treating food waste and an apparatus therefor according to the present invention. FIG. 1 shows the entire structure thereof, and FIG. 2 shows a first embodiment of a circulation passage provided with an exhaust passage and a circulation fan. FIG. 3 shows the control device.

As the processing tank 4 for containing the raw garbage 2 to be dried, for example, a container having a semi-cylindrical bottom side is used, and as a stirring means for stirring the raw garbage 2 in the processing tank 4. The scraper 6 which is the stirring impeller is provided. The scraper 6 is, for example, one in which a stirring blade 12 is attached to the tips of a plurality of arms 10 radially provided on the rotary shaft 8, and both ends of the rotary shaft 8 are bearings 14 provided on the side surface of the processing tank 4. It is rotatably supported by. A pulley 18 for receiving a rotational force from the stirring motor 16 is attached to the rotary shaft 8, and a drive chain 22 is suspended between the pulley 18 and a drive pulley 20 on the stirring motor 16 side. . That is, as shown by arrows A and B, the scraper 6 is applied with rotation having a desired rotation, continuous rotation, intermittent rotation, forward / reverse rotation, or the like by the stirring motor 16. By the rotation of the scraper 6, the food waste 2 in the processing tank 4 is stirred and crushed. In this embodiment, the stirring motor 16 is used as the rotation driving means of the scraper 6, but a driving means such as an engine may be used, and the rotation transmission means may be replaced by the sprocket wheel and the chain instead of the pulley 18 and the drive pulley 20. Alternatively, a gear mechanism or the like may be used.

On the upper side of the processing tank 4, an input port 24 for loading the raw garbage 2 into the processing tank 4 is formed, and a door 26 for opening and closing the input port 24 is a hinge 2.
It is attached so that it can be opened and closed with 8. That is, the door 26 can be opened and closed by holding the handle 30, and in the closed state, the processing tank 4 is maintained in a sealed state by a sealing means such as packing (not shown).

The bottom surface of the processing tank 4 has a processing tank 4
A heater 32 such as a sheath heater is installed as a heating means for the food waste 2 therein, and a temperature sensor 34 is installed as a means for detecting a heat generation temperature of the heater 32, that is, a surface temperature detecting means. In this embodiment, the heater 32 is installed along the curved surface of the processing tank 4. As the heating means, a burner that burns oil or fuel gas may be used, or exhaust heat of an engine or the like may be used as a heat source. Further, a temperature sensor 36 is attached to the outer wall portion of the processing bath 4 as a temperature detecting means for detecting the temperature inside the processing bath 4. The temperature sensor 36 may be attached to the inner bottom portion of the processing tank 4 while avoiding the portion of the scraper 6 that contacts the stirring blade 12. If the processing temperature of the food waste 2 exceeds the boiling temperature of 100 ° C., the food waste 2 tends to burn,
The temperature inside the bath is detected by the temperature sensor 36.

A condenser 42 is installed as a condensing means for cooling and condensing the steam 40 generated in the processing tank 4, and a circulation for circulating the steam 40 between the condenser 42 and the processing tank 4. A circulation path 44 is provided as a means, and the circulation path 44 is composed of a forward pipe 46 and a return pipe 48. That is, the steam 40 generated in the processing tank 4 flows into the condenser 42 to be cooled and condensed, and the condensed gas 41 circulates in the processing tank 4. The condenser 42 is provided with a plurality of thin tubes 50 that divide the steam 40 and flow through the thin tubes 50, and heat radiation fins 52 are attached to the thin tubes 50. The condenser 42 is provided with, for example, a heat radiation fan 54 as a heat radiation means, and the heat radiation fan 54 is driven by a motor 56 which is a driving means. By the rotation of the heat radiation fan 54, the cooling air C flows through the condenser 42 to promote heat radiation, the steam 40 passing through the condenser 42 is radiated and cooled, and condensed water 58 is generated.

In this embodiment, the condenser 42 is of a vertical type having a heat radiation surface in the horizontal direction, and condensed water 58 generated by cooling the steam 40 in a steam separation section 60 provided on the bottom side thereof. Is guided. A drain pipe 6 is provided in the steam separation unit 60.
2 are connected, and a U-shaped trap 64 is provided in the middle of the drainage pipe 62 as an odor stop.

On the inlet side of the condenser 42 to which the forward pipe 46 is connected, a temperature sensor 66 for detecting the inlet side temperature of the condenser 42 is provided as a temperature detecting means for detecting the vapor temperature before cooling.
A temperature sensor 68 that detects the outlet temperature of the condenser 42 is provided in the steam separation unit 60 as a temperature detecting means.
Further, a circulation fan 70 is attached to the return pipe 48 as a means for generating a pressure-feeding pressure in order to circulate the steam 40 forcibly, and the circulation fan 70 is driven by a motor 72 which is a driving means.

An exhaust pipe 74 is branched into the return pipe 48 on the downstream side of the circulation fan 70 as an exhaust means for guiding a part of the gas 41 to the outside air together with the pressure-feeding pressure applied to the gas 41 condensed by the circulation fan 70. ing. In this case, the condensed gas 41 guided to the circulation fan 70 side is returned to the return pipe 48.
Gas 41A flowing to the processing tank 4 side through the exhaust pipe 74
The gas 41B flowing to the side is separated. As a means for deodorizing the odor contained in the gas 41B, for example, a deodorizer 76 that decomposes the odor using a catalyst or the like is installed in the exhaust pipe 74, and the deodorizer 76 activates the deodorizing reaction.
A heater 78 is provided as a means for heating the catalyst.

For example, in the first embodiment shown in FIG. 2, the inlet portion 80 and the outlet portion 8 of the housing 71 of the circulation fan 70.
A return pipe 48 is connected to 2, and the gas 41 of the return pipe 48 is drawn into the inlet 80 of the housing 71 by the circulation fan 70 rotated by the motor 72, and is guided to the return pipe 48 of the outlet 82. An exhaust pipe 74, which is thinner than the return pipe 48, is inserted into the return pipe 48 on the outlet portion 82 side so as to penetrate the wall surface of the return pipe 48, and is integrated with the return pipe 48 by welding or the like. Exhaust pipe 74 inserted inside 48
The end portion side of the opening is bent into an L shape, for example, and the opening 84 is formed.
Is opposed to the outlet portion 82 of the circulation fan 70. Therefore, a part of the pumping pressure acting on the return pipe 48 by the circulation fan 70 can directly act on the opening 84 of the exhaust pipe 74. As a result, when the gas 41A is pumped to the return pipe 48 side and the internal pressure of the processing tank 4 is high,
The gas 41B is pumped to the exhaust pipe 74 side by the action of the pumping pressure.

Further, the food waste processing apparatus is provided with a control device 86 as a control means for executing operation control and the like, and the temperature sensors 34, 36, 6 are provided in the control device 86.
Rotation control of the stirring motor 16, the motor 72 of the circulation fan 70, driving of the heater 32, temperature control, and the like are performed based on control information such as 6, 68. This control device 86 is, for example,
As shown in FIG. 3, an arithmetic control unit 88 including a microprocessor and the like, an input unit 90, a drive output unit 92, and the like are provided, and the arithmetic control unit 88 issues an operation switch 94 for instructing an operation through the input unit 90. From driving command, temperature sensor 3
Input signals are added from 4, 36, 66, 68 and the like, and a set temperature command is added from the temperature setter 96.
The drive output of the arithmetic control unit 88 is the drive output unit 9
It is added to the stirring motor 16, the heater 32, the heater 78 of the deodorizer 76, the motor 56 of the heat radiation fan 54, the motor 72 of the circulation fan 70, etc.

With such a structure, the drying process of food waste will be described with reference to the flow charts shown in FIGS. 4A and 5A show the connection between the flowcharts.

Steps S1 to S4 are for garbage 2.
It is a drying process. That is, after putting the garbage 2 in the processing tank 4, closing the door 26 and turning on the operation switch 94, the heater 32 is energized in step S1 and the heating process is started. At the same time, the heater 78 of the deodorizer 76 is energized in step S2, the circulation fan 70 is rotated in step S3, and the heat dissipation fan 54 is rotated in step S4. At this time, in controlling the energization of the heater 32, the heat generation temperature is monitored by the temperature sensor 34, the energization is stopped when the temperature rises to a predetermined temperature, and the energization is restarted when the temperature falls below the predetermined temperature. Control is used. This prevents the garbage 2 from burning.
By the rotation of the circulation fan 70, the vapor 40 generated in the processing tank 4 is guided to the condenser 42, and most of the gas 41A of the condensed gas 41 is guided to the processing tank 4 and continuous circulation occurs, and Part of the gas 41B is the exhaust pipe 7
Leads to 4. The gas 41B is deodorized by the deodorizer 76 and then released to the outside air. The catalyst of the deodorizer 76 is heated and activated by the heater 78, and the gas 41
Deodorize B.

Steps S5 to S11 are temperature control of the processing tank 4. That is, when the heat treatment is started,
The steam 40 generated from the garbage 2 in the processing tank 4 is condensed by the condenser 42.
Therefore, the temperature sensor 68 monitors the outlet temperature of the condenser 42, and the temperature sensor 36 monitors the temperature in the processing tank 4. In this case, the temperature sensor 66 may monitor the inlet temperature of the condenser 42 as the temperature inside the processing tank 4. Therefore, in step S5, the outlet temperature of the condenser 42 is the predetermined value T
_It is determined whether or not it has reached ₁ or more, and when it has reached the predetermined value T ₁ or more, the routine proceeds to step S6, where the rotation speed of the heat radiation fan 54 is increased. Due to this increase in the number of revolutions, the heat radiation amount of the condenser 42 is increased and the condensing capacity is enhanced.

When the outlet temperature is not higher than the predetermined value T _{1 in} step S5 or after the processing in step S6, step S7
Then, it is determined whether or not the outlet temperature is lower than the predetermined value T ₂ . In this case, if the outlet temperature is less than the predetermined value T ₂ ,
Since it is in the supercooled state, it is necessary to return it to the heated state in order to prevent condensation of oil and fat in the condenser 42 and to prevent the narrow tube 50 from being blocked. Therefore, the outlet temperature is the predetermined value T
If it is less than _{2, the process} proceeds to step S8, and the heat dissipation fan 5
4 rotation speed is reduced. As a result, the heat radiation amount of the condenser 42 is reduced and the condensing ability is reduced.

When the outlet temperature is not less than the predetermined value T _{2 in} step S7 or after the processing in step S8, step S9
Then, it is determined whether or not the temperature inside the processing tank 4 has risen to a predetermined value T ₃ . When the temperature inside the tank has risen to the predetermined value T ₃ , the process proceeds to step S10 and the heat generation amount of the heater 32 is reduced. As a result, the heating amount of the processing tank 4 is reduced.

When the temperature in the tank has not risen to the predetermined value T ₃ in step S9 or after the process of step S10, the process proceeds to step S11, and it is determined whether the heat quantity of the heater 32 has decreased to the lower limit heat quantity. . When the heat amount has not dropped to the lower limit, the process returns to step S5 and steps S5 to S5.
When the process of step S10 is repeated and the lower limit of the heat quantity is reached, the process proceeds to step S12.

Then, in step S12, the condenser 42
It is determined whether the temperature difference between the inlet side temperature and the outlet side temperature has reached a predetermined value, and when the temperature difference reaches the predetermined value, step S13.
Then, the heating of the processing tank 4 is stopped assuming that the drying process is completed. That is, the energization of the heater 32 is released.

At the same time, in step S14, the circulation fan 7
0 is stopped, the heater 78 of the deodorizer 76 is de-energized in step S15, the rotation of the heat radiation fan 54 is stopped in step S16, and the drying process is ended.

In such a drying process, during the drying process, the heating of the food waste 2 in the processing tank 4 causes remarkable generation of steam 40 from the food waste 2 and the pressure inside the processing tank 4 increases. The steam 40 is guided to the condenser 42 side by the rotation of the circulation fan 70, and is separated into condensed water 58 and condensed gas 41 by the condensation process. The condensed water 58 flows from the steam separation unit 60 to the drain pipe 62 and is discarded. The condensed water 58 collected in the U-shaped trap 64 functions as an odor stop that blocks the outside air and the gas 41.

Then, the gas 41 is pressure-fed by the circulation fan 70 to the return pipe 48, the gas 41A is pressure-fed to the processing tank 4 side, and a part of the gas 41B is guided to the exhaust pipe 74 to remove the deodorizer 76. Is discharged to the outside through the deodorizer 76, and the odor is removed by the deodorizer 76.

In this way, the gas 41B is circulated by the circulation fan 70.
As a result of being forcibly guided from the exhaust pipe 74 to the outside air,
As the gas 41A decreases, the internal pressure in the processing tank 4 decreases, and the processing tank 4 is depressurized. Assuming that the exhaust pipe 74 is not provided, for example, when the outlet temperature of the condenser 42 reaches the predetermined value T ₁ or more in step S5, the rotation speed of the heat radiation fan 54 is increased in step S6.
Cooling of the condenser 42 progresses, the condensing function is enhanced, and the steam 40
The pressure can be reduced. However, if the pressure adjustment is given only to such a condensing function, the depressurization of the processing tank 4 will be indefinite or gradual change. On the other hand, when the exhaust gas from the exhaust pipe 74 is also used, the exhaust amount of the exhaust pipe 74 is increased / decreased in accordance with the pressure change in the processing tank 4, and rapid pressure adjustment is possible. Condenser 4
Combined with the cooling control by 2, it is possible to facilitate and speed up the pressure adjustment. As a result, the pressure in the processing tank 4 can be quickly controlled to be equal to or lower than atmospheric pressure, and odor leakage can be reliably prevented.

This pressure adjustment will be described with reference to FIG. 6. When the heat amount H1 is applied to the processing tank 4 by the heater 32, the water content of the raw garbage 2 is evaporated. It is assumed that the vapor 40 generated by this evaporation raises the internal pressure of the processing tank 4 to the pressure P1. The vapor 40 is guided to the condenser 42, cooled by the air supplied from the heat radiation fan 54, and the heat amount H2 is released to the atmosphere and condensed. As a result, when the reducing pressure is P2, the gas 41 after condensation is Pressure (P1-P
The pressure is reduced to 2). Since the pressure-feeding pressure P3 is generated by the rotation of the circulation fan 70, this pressure-feeding pressure P3 is applied to the gas 41, and when the pressure on the outlet 82 side of the circulation fan 70 in this case is P, P = P1-P2 + P3 ... ( 1)

Since the return pipe 48 is opened to the outside air through the exhaust pipe 74, when the pressure P shown in the equation (1) is larger than the atmospheric pressure Po (P> Po), a part of the gas 41 after condensation is gas. 41B is exhausted to the atmosphere through the exhaust pipe 74 by the forced exhaust by the circulation fan 70.

By the way, when the forced exhaust function of the circulation fan 70 works and the damping pressure on the exhaust pipe 74 side is P4,
The pressure P on the outlet portion 82 side of the circulation fan 70 is P = P1-P2 + P3-P4 (2), and this pressure P is lower than the atmospheric pressure Po and is in equilibrium. That is, the processing tank 4 is depressurized and negatively pressured. At this time, the exhaust of the gas 41B from the exhaust pipe 74 is stopped, but when the pressure P becomes higher than the atmospheric pressure Po, the pressure is reduced by the exhaust from the exhaust pipe 74. At this time,
It is possible to prevent the odor in the processing tank 4 and the circulation path 44 from leaking to the outside. Further, when the pressure in the processing tank 4 rises, the exhaust gas from the exhaust pipe 74 is deodorized and does not emit an odor.

In this case, since the pumping pressure P3 by the circulation fan 70 is constantly applied to the opening 84 of the exhaust pipe 74, the inflow of the atmosphere to the circulation path 44 side is blocked, but the opening of the exhaust pipe 74 is prevented. When the air flows away from the outlet portion 82 of the circulation fan 70, the stop pressure of the outside air intrusion due to the pumping pressure P3 is reduced. That is, the opening 84 of the exhaust pipe 74 is provided in the return pipe 48, and the opening 84 is arranged so as to face the pumping direction of the circulation fan 70.
The pressure-fed air flow of 0 is pushed into the exhaust pipe 74, and the gas 41B is forcibly exhausted to the outside by this pressure-feed pressure, and as a result, the pressure in the processing tank 4 is reduced to the atmospheric pressure or less, that is,
At the same time that the pressure is reduced to negative, the pressure of the circulation fan 70 prevents the invasion of the atmosphere. In other words, the circulation fan 70 and the exhaust pipe 74 open to the atmosphere serve as a decompression pump for decompressing the inside of the processing tank 4 and an air valve for selectively discharging the gas 41B to the outside air.

According to experiments, when such an exhaust pipe 74 is installed, the atmospheric pressure in the processing tank 4 during the drying process of the food waste ₂ is maintained at -10 to -20 mmH ₂ O. It has been confirmed. Further, the exhaust by the exhaust pipe 74 is performed intermittently, the amount of the gas 41B released is small, and the deodorizer 7
It was also confirmed that 6 and the heater 78 thereof had a small capacity. In this case, according to an experiment, in order to maintain the temperature of 300 ° C. necessary for the catalytic reaction, the capacity of the heater 78 is set to 20.
It could be reduced to about 0W.

Next, FIG. 7 shows a second embodiment of the exhaust passage. In the first embodiment shown in FIG. 2, a case has been described in which the return pipe 48 formed of a straight pipe is bent into an L shape, and the exhaust pipe 74 having the opening 84 facing the circulation fan 70 is installed. In the second embodiment, the return pipe 48 side is L
The exhaust pipe 74 is bent in a letter shape, the straight pipe-shaped exhaust pipe 74 is inserted into the return pipe 48 from the bent portion, and integrated with the return pipe 48, and the opening portion 84 of the exhaust pipe 74 is opposed to the outlet portion 82 side of the circulation fan 70. It is a thing. Even with this structure, the same effect as that of the first embodiment can be obtained.

Next, FIG. 8 shows a third embodiment of the exhaust passage. In the third embodiment, the straight pipe-shaped exhaust pipe 74 is passed through the straight pipe-shaped return pipe 48 in the direction intersecting the return pipe 48 to be integrated with the return pipe 48, and the end portion of the exhaust pipe 74 is closed. The opening 84 formed on the side surface of the circulation fan 7
0 is opposed to the outlet portion 82 side. Even with such a configuration, the same effect as that of the first embodiment can be obtained.

Next, FIGS. 9 and 10 show reference examples of the exhaust passage. As shown in FIG. 9, when a straight pipe-shaped exhaust pipe 74 is attached to the side surface of the return pipe 48 near the circulation fan 70 and the opening 84 is opened to the side wall of the return pipe 48, the circulation fan is inserted into the opening 84. Since the blowing pressure of 70 is not applied, a part of the gas 41B of the gas 41 is intermittently exhausted by the exhaust pipe 74 by the pressure difference in which the atmospheric pressure in the processing tank 4 exceeds the atmospheric pressure.
However, it is difficult to reduce the internal pressure of the processing tank 4 to the atmospheric pressure or lower because the action of the pumping pressure of the circulation fan 70 applied to the opening 84 is low.

Further, as shown in FIG. 10, an orifice plate 98 is provided on the return pipe 48 side as a limiting means for suppressing the gas 41A.
Attached, and the through hole 100 of the orifice plate 98 is attached to the return pipe 48.
If it is set to be smaller than the inner diameter of the gas, the pumping pressure from the circulation fan 70 can be exerted on the exhaust pipe 74 side.
Discharge of 1B becomes remarkable. In this case, the amount of the gas 41A returning from the return pipe 48 to the processing tank 4 side decreases, and the exhaust pipe 74
The amount of deodorizing treatment on the side will increase.

In the embodiment, the pumping pressure acting on the exhaust pipe 74 side is formed by the circulation fan 70 on the circulation path 44 side, but an independent exhaust fan is installed on the exhaust pipe 74 side separately from the circulation fan 70. However, the same effect can be expected. That is, if an exhaust fan is separately installed on the exhaust pipe 74 side of the reference example of FIGS. 9 and 10, the same effect as that of the first embodiment can be expected in the reference examples of FIGS.

[0043]

As described above, according to the present invention,
The following effects are obtained. a) The high-pressure steam generated in the processing tank is condensed by the condensing means,
The internal pressure of the processing tank can be adjusted and the pressure can be reduced by a simple pressure adjustment such that a part of the gas is exhausted to the outside together with the pressure-feeding pressure applied to the condensed gas, and the leakage of odor can be prevented. b Since part of the gas after condensation can be exhausted to the outside air together with the pumping pressure to adjust the pressure, the high pressure of the treatment tank and the condensation capacity of the condensation means should be balanced regardless of the condensation capacity of the condensation means. It is possible to use a condensing means having a small capacity. c As the gas after condensation is exhausted and the gas required for decompression adjustment is exhausted, the exhaust amount is small, the deodorizing process can be facilitated, and the power consumption accompanying deodorizing can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a food waste processing method and apparatus of the present invention.

FIG. 2 is a cross-sectional view showing a first embodiment of an exhaust passage.

FIG. 3 is a block diagram showing a control device.

FIG. 4 is a flowchart showing a garbage processing operation.

FIG. 5 is a flowchart showing a food waste processing operation subsequent to FIG.

FIG. 6 is a diagram showing pressure adjustment in a processing tank and a circulation path.

FIG. 7 is a sectional view showing a second embodiment of the exhaust passage.

FIG. 8 is a cross-sectional view showing a third embodiment of the exhaust passage.

FIG. 9 is a cross-sectional view showing a comparative example of an exhaust passage.

FIG. 10 is a cross-sectional view showing another comparative example of the exhaust passage.

[Explanation of symbols]

2 garbage 4 processing tanks 40 steam 42 condenser (condensing means) 41, 41A, 41B gas 44 Circulation path (circulation means) 58 Condensed water 70 Circulation fan (circulation means) 74 Exhaust pipe (exhaust means) 76 Deodorizer (Deodorizing means)

Continued front page    (72) Inventor Yomura Yoshihiro             No. 201 Nishi-Kashiwabara Shinden, Fuji City, Shizuoka Prefecture Takagi             Business F-term (reference) 4D004 AA03 BA04 CA04 CA15 CA22                       CA42 CA48 CA50 CB04 CB13                       CB28 CB31 CB32 CB34 CB44                       CC09 DA01 DA02 DA06 DA13                 4D052 AA00 AA10 BA02 BB02 FA08

Claims (5)

[Claims] 1. A method for treating food waste, comprising: introducing vapor generated from food waste in a treatment tank by heat treatment to the outside of the treatment tank to condense the condensed gas and sending the condensed gas to the treatment tank under pressure. The method for treating food waste, characterized in that the internal pressure of the treatment tank is maintained at atmospheric pressure or lower by introducing a part of the gas into the outside air together with the pressure-feeding pressure applied to the gas. 2. The garbage processing method according to claim 1, wherein the gas introduced to the outside is subjected to a deodorizing process. 3. The raw garbage is placed in a treatment tank to be heated, and the vapor generated from the raw garbage is introduced from the treatment tank to a condensing means to be condensed, whereby a gas separated from condensed water is introduced to the treatment tank. In the food waste processing device, the circulation means for guiding the gas from the condensing means to the processing tank and for feeding the condensed gas to the processing tank side, and the gas after condensation by the circulating means. An apparatus for discharging food waste, comprising: an exhaust unit that guides a part of the gas to the outside air together with the pressure-feeding pressure applied to the air and maintains the internal pressure of the processing tank at atmospheric pressure or lower. 4. The garbage disposal according to claim 3, wherein the circulation means includes a circulation fan that generates the pressure-feeding pressure, and the pressure-feeding pressure generated by the circulation fan acts on the exhaust means. apparatus. 5. The food waste processing apparatus according to claim 3, wherein the exhaust unit includes a deodorizing unit.