JPH0573968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a kitchen waste processing apparatus for reducing raw rubber by incineration using microwaves.

BACKGROUND ART Conventionally, as shown in FIG. 3, this type of kitchen waste processing apparatus has a heat-generating container 2 that generates heat using microwaves disposed at the inner bottom of a box-shaped main body 1 that is a microwave resonator. Further, an input port 3 for garbage 4 is provided on one side of the main body 1, and this input port 3 has a lid 15 that can be opened and closed.
It is opened and closed by In addition to the main body 1, there is a supply port 6 on the side.
A magnetron device 5 for generating microwaves for sending microwaves into the main body 1 is installed facing the supply port 6. An air supply port 7 is provided below the supply port 6 and is connected to a supply air blower 8 to supply air necessary for combustion into the main body 1. The supply air blower 8 also branches to the magnetron device 5 side and sends cooling air. An exhaust port 9 for exhaust gas generated by combustion of trash is provided in the upper part of the main body 1, and this exhaust port 9 is connected to an exhaust gas purification unit 12 and an exhaust blower 13 via a flue 9a. The exhaust gas purification unit 12 is composed of a heater 10 and an oxidation catalyst 11. These exhaust gas purification unit 12 and exhaust blower 13 are attached to the upper part of an outer shell 14 that covers the main body 1.

With the above configuration, when food waste 4 is placed in the heat generating container 2 and microwaves are radiated, the food waste is burned by heating due to internal heat generation of the food waste itself and heating due to heat generated by the heat generating container 2. At this time, the generated exhaust gas is passed through the exhaust gas purification unit. Pass 12. This exhaust gas purification unit heats the exhaust gas with a heater 10 to enhance the catalytic action, and then purifies and discharges the exhaust gas with an oxidation catalyst 11.

Problems to be Solved by the Invention In such a conventional configuration, exhaust gas that is sufficiently hot due to combustion heat is cooled while passing through the flue 9a, and therefore enters the exhaust gas purification unit 12 and is heated by the oxidation catalyst 1.
1, it was necessary to reheat the catalyst to its functional temperature (250° C. or higher) using a heater 10.
Therefore, heating energy is required to reheat the exhaust gas, which is not suitable for energy saving. Further, there was a problem in that structures such as the flue 9a and the heater 10 were required.

The present invention solves these problems,
It is an object of the present invention to provide an energy-saving and economical kitchen waste processing device that can purify exhaust gas generated during food waste processing without reheating the waste gas.

Means for Solving the Problem In order to solve this problem, the kitchen waste processing apparatus of the present invention is provided with an air supply port and an exhaust port in the main body which is a microwave resonator, and the exhaust port generates heat by the microwave. This is a configuration in which an oxide catalyst body is provided.

Effect With this configuration, when microwaves are radiated into the main body, exhaust gas is generated by combustion of garbage, which passes through the exhaust port and is discharged to the outside. When this exhaust gas is discharged, it is oxidized and decomposed into water, carbon dioxide, etc. by the oxide catalyst which self-heats due to microwaves and reaches the catalytic function temperature.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that parts that are the same as those in the conventional configuration are given the same numbers, and their explanations will be omitted.

In the figure, a main body 1 as a microwave resonator is provided within an outer shell 14, and a heat generating container 2 is disposed at the inner bottom of the main body 1. Then, a door 15 attached to one side of the main body 1 so as to be openable and closable is opened, and the garbage 4 is put into the heat generating container 2 through the input port 3. Further, a supply port 6 is opened on the other side of the main body 1, and a magnetron device 5 is provided at the back of a waveguide 6a connected to the supply port 6. An air supply port 7 is provided below the supply port 6 and is connected to a supply air blower 8 . Further, the discharge side of the supply air blower 8 is branched to supply cooling air to the magnetron device 5.
The heat generating container 2 is made of a sintered body of silicon carbide and barium titanate, has a heat resistance of 1000° C. or more, and generates heat by microwaves. An oxide catalyst body 100 formed in a honeycomb shape is attached to an exhaust port 101 provided on the upper side surface of the main body 1 . This exhaust port 101 is connected to an exhaust blower 102 via a flue 101a. Note that each opening of the main body 1, except for the microwave supply port 6, is provided with means for preventing leakage of radio waves.

In the above configuration, the garbage 4 is thrown into the heat generating container 4 through the inlet 3 of the main body 1. When the magnetron device 5 is energized, microwaves are generated and introduced into the main body 1 through the supply port 6 through the waveguide 6a. The microwave acts directly on the garbage 4. In general, food waste 4 has a high moisture content and low thermal conductivity, and there are many spaces between the food wastes, so it is very difficult to externally heat it, but microwaves can instantly reach the inside of food waste 4. Heat. Moreover, it also acts on the heat generating container 2 at the same time. Heat generating container 2
Since it is composed of a sintered body of silicon carbide and barium titanate, which is a ferroelectric substance, it generates heat equivalent to the dielectric loss of barium titanate, and the heat generating container 7 is made of silicon carbide, which has good thermal conductivity. The whole thing gets heated.
As a result, as shown in FIG. 2, a high-temperature part 103 is formed in the heat generating container 2, where the temperature is extremely high due to the heat generated by the internal heating of the garbage 4 and the heat from the heat generating container 2, and the garbage 4 is almost completely heated. After burning, only a small amount of white ash remains. On the other hand, heating by microwaves only progresses. On the other hand, as the heating by the microwave progresses, the garbage 4 is initially heated to the boiling point of water and is gradually dehydrated. Once dehydration is complete, the temperature rises above the boiling point, and eventually reaches the ignition point, where combustion begins. When dehydration leads to ignition, a smoldering state occurs, producing smoke and odor. The main components are CO, HC, and unburned hydrocarbons in the form of tar. These exhaust gases are removed by an exhaust blower 10.
2 and sent to the oxide catalyst body 100, which has a honeycomb structure and has a large number of cylindrical holes. The oxide catalyst body 100 has a honeycomb structure in which a carrier is formed by mixing and sintering fused silica, barium titanate, silicon carbide, and titanium dioxide into aluminate coal as a binder, and a base material supporting titanium dioxide. A platinum group metal is supported as a catalyst. Therefore, when exposed to microwaves, the oxide catalyst 100 itself is heated to a temperature higher than the catalyst's functional temperature (approximately 250°C or higher) due to the action of barium titanate, which is a ferroelectric substance, and the exhaust gas being sent is also heated. , purifies exhaust gas by oxidizing it and converting it into water or carbon dioxide using a catalytic effect. At this time, since the concentration of unburned products such as CO and HC in the exhaust gas is relatively high,
As catalytic oxidation combustion occurs and heat is generated during purification, the temperature of the oxide catalyst body 100 is a high temperature (approximately 800°C), which is much higher than the temperature caused by microwave heat generation.
reach. Therefore, odor components in the exhaust gas that are not suitable for oxidation treatment are almost completely decomposed in this temperature range, and good deodorization can be achieved. The purified exhaust gas is then exhausted by the exhaust blower 102.

In addition, in the present invention, even if the garbage becomes ash and the load becomes zero, the heat generating container 2 and the oxide catalyst body 100
remains as a load, so the magnetron device 5 is not damaged in the so-called dry state. Furthermore, although barium titanate was used as the material for microwave heating, any ferroelectric material with heat resistance may be used. Further, although an oxide catalyst was used in this example, a ceramic catalyst such as a deolite catalyst or an intercalation (stacking) compound may also have the same effect.

Effects of the Invention As described above, according to the present invention, food waste is heated twice by direct internal heating by microwaves and heat from a heat-generating container and self-combusts, and the exhaust gas generated at that time is an oxide medium. Since it self-heats, it is completely decomposed without reheating with an auxiliary heater. As a result, efficient exhaust gas treatment with less thermal energy loss is possible, and the conventionally required heater is not required, making it possible to reduce manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a kitchen waste processing apparatus according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the processing state of a heat generating container of the same kitchen waste processing apparatus, and Fig. 3 is a longitudinal cross-sectional view showing a conventional kitchen waste processing apparatus. FIG. 1... Main body, 2... Heat generating container, 3... Inlet,
5... Magnetron device, 6... Supply port, 7...
Air supply port, 100... Oxide catalyst body, 101... Exhaust port.

Claims (1)

[Scope of Claims] 1. A main body configured as a microwave resonator, an air supply port and an exhaust port provided in the main body, and a heat generating container disposed within the main body that generates heat by microwaves, and the exhaust port is a kitchen waste processing device equipped with a catalyst that generates heat using microwaves. 2. A patent in which the catalytic body is an oxide catalytic body, the oxide catalytic body is composed of a support made of lime aluminate, fused silica, barium titanate, silicon carbide, and titanium dioxide, and a platinum group metal is supported as a catalyst. A kitchen waste processing device according to claim 1.