JPH0731964A - Garbage processor - Google Patents

Abstract

(57) [Summary] [Purpose] Negative pressure inside the drying container and hopper allows additional input of food waste during operation, while ensuring air to the burner in the deodorizing furnace and drying. Increase the amount of hot air into the container. [Structure] A drying container 3 for drying food waste, a deodorizing furnace 7 having a burner 6, a first heat exchanger 8 formed around the deodorizing furnace 7, and air to the first heat exchanger 8. A drying air supply pipe 23 for supplying, a hot air supply pipe 19 for connecting the drying container 3 and the first heat exchanger 8, and a second heat for exchanging heat between the exhaust gas of the deodorizing furnace 7 and the exhaust gas of the drying container 3. An exchanger 9, a drying air discharge pipe 20 for supplying the exhaust air of the drying container 3 to the deodorizing furnace 7 through the second heat exchanger 9, and a drying air discharge pipe 20.
And a blower fan for supplying a part of the exhaust gas of the drying container 3 to the burner 6.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is intended to reduce the volume and weight of food waste such as leftover food from food factories, hotels, restaurants, employee cafeterias, apartments, etc., and prevent the decay of food waste.
Further, the present invention relates to a food waste processing device for reusing food waste as a raw material such as fertilizer and feed.

[0002]

2. Description of the Related Art In recent years, food waste such as leftover foods has problems such as occurrence of decay on the user side, increase of garbage storage area, and increase of collection fee of a processing company. There are problems such as increase in collection and transportation costs, labor shortage, etc. Furthermore, local governments also have problems such as incinerator and landfill countermeasures, and the reduction of volume and reduction of garbage becomes a major issue. ing.

A conventional food waste processing apparatus will be described with reference to FIG. 3. The food waste processing apparatus is roughly composed of a hopper 51 for inputting food waste, a food waste supply device 52, a drying container 53, and a burner 5.
4, a deodorizing furnace 55, a first heat exchanger 56, a second heat exchanger 57, and a blower fan 58. Hopper 51
The opening / closing lid 59 is provided, and the drying container 53 is provided with a rotating shaft 60 driven by an electric motor (not shown) and a stirring member 61 provided on the rotating shaft 60. Drying container 53
A waste container 62 is attached to the lower part of the
3 are provided.

When the burner 54 and the blower fan 58 are operated, outside air is exhausted from the exhaust pipe 64 in the first heat exchanger 56.
It is heated by the air passing therethrough, is supplied into the drying container 53 through the hot air supply pipe 65, and is supplied as primary air to the burner 54 through the combustion air supply pipe 67. The hot air is adiabatically cooled by coming into contact with the food waste in the drying container 53, and the moist air that has absorbed the water content of the food waste is sent to the second heat exchanger 57 via the drying air discharge pipe 66, where After being heated by the exhaust gas passing through the exhaust pipe 64, the secondary air is sent to the burner 54. This secondary air is
In the deodorization furnace 55, the odor contained in the secondary air is decomposed by heating and used as combustion air, and is exhausted to the outside. On the other hand, the food waste is put into the hopper 51, crushed and dehydrated by the food waste supply device 52, and then the food waste is sent into the drying container 53, and the stirring member 61 is placed in the drying container 53.
The food waste that has been stirred by and dried in the drying container 53 is stored in the garbage storage container 62 by opening the opening / closing lid 63.

By the way, the food waste is a mixture of various foods, and the factors of spoilage and odor generation thereof differ depending on the water activity aw of each food. Here, the water activity aw is aw = steam pressure of food / saturated steam pressure of air. It is said that it is preferable to dry so that the water activity aw becomes about 0.2 to 0.6. This is because if the water activity is too low, the deterioration of the lipid is promoted by the oxidation of the lipid. Therefore, it is necessary to dry so that the water activity becomes a predetermined value. Therefore, the inlet temperature T of the drying container 53
The combustion amount of the deodorizing furnace 55 is controlled so that _IN becomes constant, and the dry state is grasped by the outlet temperature T _OUT of the drying container 53.

This will be described with reference to FIG. FIG. 4 shows a moist air diagram, where t is the dry-bulb temperature (° C.), X is the absolute humidity (x
g / kg Air), ψ indicates relative humidity (%).
For example, if the water activity of food waste is dried to 0.3, the relative humidity of the humid air at the outlet of the drying container 53 is set to 30.
You can set it to%. If the outside air temperature is 30 ° C. and the relative humidity is 80% (point A in the figure), this is heated to 120 ° C. along the iso-absolute humidity line B by the first heat exchanger 56 (see the figure). (Point C), inside the drying container 53, the air is cooled along the adiabatic cooling line D and becomes saturated air at point E at 40 ° C. in a steady state.
When the garbage is dried and the water activity decreases, the outlet air temperature rises and the relative humidity crosses 30%.
Becomes the outlet temperature of the drying container 53. That is, in order to set the water activity of raw garbage to 0.3, the drying may be terminated when the outlet temperature of the drying container 53 reaches the temperature of point F.

[0007]

However, in the above-mentioned conventional food waste processing apparatus, the blower fan 58 is disposed on the upstream side of the drying container 53, and since the inside of the drying container and the hopper are in a pressurized state, If the opening / closing lid 59 is opened during the operation, there is a problem that the hot air supplied from the hot air supply pipe 65 into the drying container 53 flows from the hopper 51 to the outside and the odor leaks. In addition, the combustion air supply pipe 67
Since the amount of air flowing into the burner 54 decreases, the combustion of the burner 54 in the deodorizing furnace 55 deteriorates, and there is a problem that odors, soot, and the like are generated. As a result, the lid 5 can be opened and closed during operation.
It was not possible to open 9 and add additional garbage.

The present invention is to solve the above-mentioned problems, and by making the inside of the drying container and the hopper a negative pressure,
In addition to enabling the addition of food waste during operation,
It is an object of the present invention to provide a food waste processing device which can secure air to a burner in a deodorizing furnace and can increase the amount of hot air into the drying container.

[0009]

For this purpose, the apparatus for treating food waste according to the present invention comprises a drying container 3 for drying food waste, a deodorizing furnace 7 having a burner 6, and a first device formed around the deodorizing furnace 7. Heat exchanger 8, a drying air supply pipe 23 that supplies air to the first heat exchanger 8, a hot air supply pipe 19 that connects the drying container 3 and the first heat exchanger 8, and a deodorizing furnace 7 A second heat exchanger 9 for exchanging heat between the exhaust of the air and the exhaust of the drying container 3,
The drying air exhaust pipe 20 for supplying the exhaust air of the drying container 3 to the deodorizing furnace 7 via the second heat exchanger 9 and the drying air exhaust pipe 20 are arranged so that a part of the exhaust gas of the drying container 3 is exhausted. Burner 6
And a blower fan for supplying to the. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings in order to facilitate understanding of the present invention, and the configurations of the present invention are not limited thereby.

[0010]

In the present invention, for example, as shown in FIG.
Since the blower fan 10 is provided on the downstream side of the drying container 3, a negative pressure is generated in the hopper 1 and the drying container 3 during operation, and the hot air in the drying container 3 does not blow into the hopper 1 and the operation is performed. It is possible to add additional garbage inside. Also, secure air to the burner 6 in the deodorization furnace 7,
Moreover, the amount of hot air flowing into the drying container 3 can be increased.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a food waste processing device according to the present invention. The garbage processing device of the present invention,
Outline, hopper 1 for inputting food waste, food waste supply device 2,
Drying container 3, filter 4, food waste container 5, burner 6
Deodorizing furnace 7 having a heater, a first heat exchanger 8 formed around the deodorizing furnace 7, a second heat exchanger 9, a blower fan 10, a fuel tank 11, a fuel pump 12, an ignition device 13, and a controller. It consists of 14.

The hopper 1 for throwing in garbage has an opening / closing lid 15. A raw garbage supply device 2 is attached to a lower portion of the hopper 1, and a lower portion of the raw garbage supply device 2 is connected to a drain valve 18. The raw garbage supply device 2 is connected to the opening 3a on the lower side surface of the drying container 3 and is driven by the electric motor M1 to convey the raw garbage from the hopper 1 into the drying container 3. A stirring member 16 driven by an electric motor M2 is provided in the drying container 3. At the bottom of the drying container 3,
An open / close lid 17 for discharging raw garbage is provided so that dried raw garbage can be discharged into the storage container 5.

A hot air supply pipe 19 is connected to the upper part of the drying container 3, and hot air is supplied into the drying container 3 through the dry air supply pipe 23 and the first heat exchanger 8. The filter 4 and the dry air discharge pipe 20 are connected to a position facing the hot air supply pipe 19 in the upper part of the drying container 3, and the blower fan 10 is arranged on the downstream side of the filter 4. This blower fan 10
As a result, a part of the dry air is heated in the second heat exchanger 9 by the exhaust gas from the exhaust pipe 21 from the deodorizing furnace 7, and then supplied as the secondary air for combustion into the deodorizing furnace 7 to obtain the dry air. Part of the burner 6 passes through the combustion air supply pipe 22.
Is supplied as primary air. Fuel is supplied to the burner 6 from a fuel tank 11 by a fuel pump 12. The first and second heat exchangers 8 and 9, the hot air supply pipe 19 and the like are covered with a heat insulating material 27. A flame detection sensor 24 is provided in the deodorizing furnace 7, and temperature sensors T _IN and T _OUT are provided on the inlet side and the outlet side of the drying container 3, respectively, and are connected to the controller 14.

FIG. 2 shows an example of a specific structure of the food waste processing apparatus in FIG. 1. FIG. 2 (A) is a front view showing the inside, and FIGS. 2 (B) and 2 (C) are respectively, It is the figure seen from the B direction and C direction of FIG. 2 (A). The same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 30 is a housing, 31 is a speed reducer for the electric motor M2, and 32 is a transmission belt or chain for transmitting the power of the electric motor M1 to the food waste feeder 2.

Next, the method of treating food waste according to the present invention having the above-mentioned structure will be described. When the burner 6 and the blower fan 10 are operated, outside air is supplied to the drying air supply pipe 23.
Is heated by the heat of the deodorizing furnace 7 in the first heat exchanger 8 and is sucked into the drying container 3 through the hot air supply pipe 19. This high temperature air is adiabatically cooled by coming into contact with food waste in the drying container 3, and the moist air that has absorbed the water content of the food waste is sent to the second heat exchanger 9 via the dry air discharge pipe 20. Here, after being heated by the exhaust gas passing through the exhaust pipe 21, it is sent to the deodorizing furnace 7 as secondary air. This secondary air is used as combustion air in the deodorizing furnace 7, and the odor contained in the exhaust air is thermally decomposed and exhausted to the outside.

On the other hand, food waste is thrown into the hopper 1,
The food waste is fed by the food waste feeding device 2 driven by the electric motor M1 and fed into the drying container 3 through the opening 3a.
Next, the food waste is crushed and stirred by the stirring member 16 driven by the electric motor M2 in the drying container 3, and dried. The dried garbage is stored in the garbage container 5 by opening the discharge opening / closing lid 17. According to the present invention, since the blower fan 10 is provided on the downstream side of the drying container 3, the hopper 1 and the drying container 3 are in operation during operation.
The inside becomes a negative pressure, and the hot air in the drying container 3 does not blow out into the hopper 1, so that it is possible to add additional food waste during operation. Further, it is possible to secure the air to the burner 6 in the deodorization furnace 7 and increase the amount of hot air into the drying container 3, and the drying processing speed is 20 to 30 compared with the conventional one.
% Can be improved.

[0017]

As is apparent from the above description, according to the present invention, by adding negative pressure to the inside of the drying container and the hopper, it is possible to add raw garbage during operation and to burner in the deodorizing furnace. It is possible to secure air to the drying container and increase the amount of hot air into the drying container.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing one embodiment of a food waste processing device of the present invention.

FIG. 2 is a specific configuration 1 of the food waste processing device in FIG.
FIG. 2A shows an example, and FIG.
2B and FIG. 2C are views respectively viewed from the B direction and the C direction in FIG. 2A.

FIG. 3 is a configuration diagram showing a conventional food waste processing device.

FIG. 4 is a moist air diagram for explaining the method of treating food waste.

[Explanation of symbols]

1 ... Hopper for inputting garbage, 2 ... Garbage feeding device, 3
... Drying container 5 ... Raw food storage container, 6 ... Burner, 7 ... Deodorizing furnace, 8 ... First heat exchanger 9 ... Second heat exchanger, 10 ... Blower fan, 16 ... Stirring member 19 ... Hot air supply Pipe, 20 ... Dry air discharge pipe, 21 ... Exhaust pipe 22 ... Combustion air supply pipe, 23 ... Drying air supply pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F26B 21/00 M 9140-3L (72) Inventor Akihiro Yamane Nishitsurugaoka 1-chome, Oi-cho, Iruma-gun, Saitama Prefecture No. 3 No. 1 within Tonen Corporation Research Institute

Claims (1)

[Claims] 1. A drying container for drying food waste, a deodorizing furnace having a burner, a first heat exchanger formed around the deodorizing furnace, and air is supplied to the first heat exchanger. A drying air supply pipe, a hot air supply pipe connecting the drying container and the first heat exchanger, a second heat exchanger for exchanging heat between the exhaust of the deodorizing furnace and the exhaust of the drying container, and the drying A drying air exhaust pipe for supplying the exhaust air of the container to the deodorizing furnace through the second heat exchanger, and a blower provided for the drying air exhaust pipe and supplying a part of the exhaust gas of the drying container to the burner. A food waste processing device comprising a fan.