JP3288779B2 - Microwave heating and incineration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave heating / incineration apparatus such as a garbage incinerator.

[0002]

2. Description of the Related Art An apparatus for heating and burning by irradiating a microwave includes a microwave generating section to protect the microwave generating section from direct attack by oil smoke or high-temperature corrosive gas generated during combustion. A member (shield plate) for isolating the combustion chamber is required. Conventionally, a vitreous shielding plate has been used, but has a disadvantage that it is easily broken. This is because, when oily smoke generated during the burning of an object or foreign matter that easily absorbs various microwaves adheres to the vitreous material, localized concentrated absorption and heating of microwaves occur there, and cracks occur due to thermal stress It can lead to damage. For this reason, the life of the device has been significantly shortened. There is an example in which a gas-permeable porous ceramic plate is used together with a shielding plate in a conventional apparatus (Japanese Patent Laid-Open No. 1-285805). It is obvious that it will not be protected.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a microwave heating / incineration apparatus, which is provided between a microwave generating section and a heating / incineration chamber, which is caused by the influence of high-temperature corrosive gas or combustible gas generated during combustion. Damage of the shielding plate provided in
This prevents the device from becoming complicated and extends the life of the device.

[0004]

According to the present invention, there is provided a microwave heating / incineration apparatus having a heat- and corrosion-resistant shield for isolating a microwave generator from a combustion chamber. A ceramic member having excellent microwave permeability was used.

[0005]

By adopting the above ceramic member, the microwave absorption by the shielding plate prevents deterioration of the microwave generating unit and the like without impairing the efficient heating, and provides a long-life stable microwave. A wave heating and incineration apparatus is provided.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a microwave heating / incineration apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a microwave generator, 2 denotes a ceramic shielding plate, 3 denotes a heating / incineration chamber, and 4 denotes a combustion gas discharge port. Microwaves exit from 1 and pass through 2 ceramic shielding plates and are absorbed by the burned material in the heating / combustion chamber of 3. At this time, since the ceramic shield plate 2 is made of a material having excellent microwave permeability, microwaves are transmitted with little absorption. Further, gas generated by heating and burning is discharged out of the apparatus from the outlet 4. At this time, since the second ceramic shielding plate has no air permeability, the combustion gas does not reach the microwave generating portion through the second shielding plate and does not adversely affect it.

First, a dense silicon nitride sintered body was used as the ceramic member. This material has high corrosion resistance and not only withstands corrosive gas generated during combustion, but also has excellent heat resistance and thermal shock resistance. It is not affected by thermal stress due to high temperature. As a result of an actual machine test for 20 months, it was confirmed that when this silicon nitride shielding plate was used, no cracks occurred in the shielding plate, and the shielding plate could be used for a sufficiently long period.

Next, a reaction-sintered silicon nitride having a dense film formed on the surface was used as the ceramic shielding plate. This material is a porous material having about 20 to 30% of pores, but blocks a gas permeation by forming a dense film on the surface. The method of forming the coating is glazing, thermal spraying,
Any method such as CVD may be used. In addition, as the components of the coating, any components having a small microwave absorbency may be used.

[0010] baked on one surface of the SiO ₂ -Al ₂ O ₃ based material the glazing method of reaction sintering silicon nitride plate to form a film, as a shielding plate so that the plane of the coating is heated and the combustion chamber side installed. The feature of this reaction-sintered silicon nitride is that the microwave permeability is about 20% better than the silicon nitride. Thereby, the heating by the microwave could be performed more efficiently. In addition, the manufacturing cost was low and the manufacturing cost was only about half that of silicon nitride. On the other hand, although strength is lower than silicon nitride, strength and thermal shock resistance are sufficiently higher than glass. As a result of an actual machine test for 20 months, no cracks were found in the shielding plate as in the case of silicon nitride, and it was confirmed that the shielding plate could be used for a sufficiently long period.

[0011]

In summary, the present invention relates to a microwave heating and incineration apparatus using a ceramic member having high microwave permeability and non-permeability as a shielding plate for separating a microwave generating section and a heating and combustion chamber. Accordingly, the deterioration and damage of the device are prevented without lowering the efficiency of microwave heating, and the life of the device is increased. Another advantage is that only one ceramic plate is used as the shielding plate, and the device can be simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a microwave heating and incineration apparatus of the present invention.

[Explanation of symbols]

 1 Microwave generator 2 Shield plate 3 Heating / combustion chamber 4 Combustion gas outlet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23G 5/10 F23G 5/00 H05B 6/72 H05B 6/80

Claims (1)

(57) [Claims] 1. A microwave generator, a heating / incineration chamber for an object, and a microwave without air permeability installed therebetween.
A microwave heating and incineration apparatus comprising a shielding material made of a transparent ceramic;
Is a silicon nitride-based reaction sintered body, and its heating and incineration chamber
A microwave heating and incineration apparatus characterized in that a dense film is formed on the surface on the side .