JPH0571871A - Floating, heating and drying method with microwave - Google Patents

Floating, heating and drying method with microwave

Info

Publication number
JPH0571871A
JPH0571871A JP25714691A JP25714691A JPH0571871A JP H0571871 A JPH0571871 A JP H0571871A JP 25714691 A JP25714691 A JP 25714691A JP 25714691 A JP25714691 A JP 25714691A JP H0571871 A JPH0571871 A JP H0571871A
Authority
JP
Japan
Prior art keywords
heated
microwave
heating
heating chamber
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP25714691A
Other languages
Japanese (ja)
Inventor
Tomio Minobe
富男 美濃部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micro Denshi Co Ltd
Original Assignee
Micro Denshi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Micro Denshi Co Ltd filed Critical Micro Denshi Co Ltd
Priority to JP25714691A priority Critical patent/JPH0571871A/en
Publication of JPH0571871A publication Critical patent/JPH0571871A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To develop a method for effectively heating and drying powderlike or granular material to be heated such as rubber powder, plastic pellets, ceramic powder, etc., by utilizing microwave energy. CONSTITUTION:A bottom section 2 is formed with a metal microwave heating chamber 1. A method for heating and drying a material 4 to be heated comprises the steps of floating the material 4 to be heated up to a distance of about 1/4 wavelength of a microwave from the bottom section 2, and irradiating the material 4 to be heated with the microwave in the floated state while mixing and agitating it.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、ゴム粉末、プラスチ
ックペレット、セラミック粉末などの粉粒状や顆粒状の
被加熱物をマイクロ波エネルギ−を利用して加熱乾燥さ
せるマイクロ波による加熱乾燥法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave heating and drying method for heating and drying powdery or granular objects to be heated such as rubber powder, plastic pellets and ceramic powder by using microwave energy.

【0002】[0002]

【従来の技術】従来、マイクロ波エネルギ−を利用して
粉粒状や顆粒状の被加熱物を加熱乾燥させる方法とし
て、被加熱物をマイクロ波加熱室内に一定時間定置して
処理するバッチ方式と、被加熱物をマイクロ波加熱室内
で移動させながら処理する連続方式の二種類がある。
2. Description of the Related Art Conventionally, as a method for heating and drying a powdery or granular object to be heated by using microwave energy, there is a batch method in which the object to be heated is placed in a microwave heating chamber for a certain period of time and treated. There are two types, a continuous method, in which an object to be heated is processed while being moved in a microwave heating chamber.

【0003】バツチ方式は、被加熱物を誘電損失の小さ
い材質、例えば、ガラス、陶器、プラスチック、テフロ
ン等の容器に入れてマイクロ波加熱室内に配置し、マイ
クロ波を照射せしめて加熱乾燥を行なうものであるが、
このバッチ方式では、粉粒状や顆粒状の被加熱物が加熱
室内に置かれた状態で加熱されるため、被加熱物が均一
に加熱されないという問題点があった。
In the batch method, an object to be heated is placed in a container having a small dielectric loss, such as glass, pottery, plastic, or Teflon, placed in a microwave heating chamber, irradiated with microwaves, and dried by heating. But
In this batch method, since the powdery or granular object to be heated is heated in a state of being placed in the heating chamber, there is a problem that the object to be heated is not uniformly heated.

【0004】例えば、被加熱物を加熱室で数十度〜数百
度(例えば、60℃〜350℃)に均一に加熱乾燥する
ことを試みても容器と接触している被加熱物及び空気の
接触面となる被加熱物に比べ内部の被加熱物に温度差が
生じ、均一に加熱することが難かしく、物によっては加
熱が進行し発火したり、燃焼したりすることがある。
For example, even if an attempt is made to uniformly heat and dry an object to be heated in the heating chamber to several tens to several hundreds of degrees (for example, 60 ° C. to 350 ° C.), the amount of the object to be heated and the air which are in contact with the container There is a temperature difference in the internal object to be heated as compared with the object to be the contact surface, and it is difficult to heat the object uniformly, and depending on the object, heating may proceed, causing ignition or burning.

【0005】特に、マイクロ波エネルギ−の吸収の良い
被加熱物(誘電損失計数εγ・tanδの大きい物質)
においては局部的な加熱過剰が発生し、さらに、ゴム、
プラスチック、塩化ビニ−ルなどのような温度上昇に伴
ってマイクロ波吸収が良くなる特性の材質においては、
相乗効果によって加熱過剰が著しくなり加熱のランナウ
ェ−現象が発生し易くなるため、均一加熱、乾燥処理が
非常に困難であった。また、このバッチ方式は、被加熱
物の加熱室への供給、取出しが非連続であるため、工業
用として大量に加熱、乾燥処理することができないか
ら、実験規模で実施されている。
Particularly, an object to be heated which has a good absorption of microwave energy (a substance having a large dielectric loss coefficient εγ · tanδ)
In the case of local overheating, rubber,
For materials such as plastic and vinyl chloride that have the property of improving microwave absorption with increasing temperature,
Due to the synergistic effect, excessive heating becomes remarkable and the runner-way phenomenon of heating easily occurs, so that uniform heating and drying treatment are very difficult. Further, this batch method is carried out on an experimental scale because it is not possible to heat and dry a large amount for industrial use because supply and removal of the object to be heated to and from the heating chamber are discontinuous.

【0006】そこで、本発明の出願人はこのような問題
を解決するため、被加熱物を加熱室内で撹拌しながらマ
イクロ波を照射する加熱乾燥手段について実用新案登録
第12676号として既に提案してある。この加熱乾燥
手段は、加熱室の下部に回転羽根を備えた混合撹拌機構
を備え、被加熱物を混合撹拌しながらマイクロ波を照射
して均一加熱する構成となっている。
Therefore, in order to solve such a problem, the applicant of the present invention has already proposed, as a utility model registration No. 12676, a heating and drying means for irradiating microwaves while stirring an object to be heated in a heating chamber. is there. This heating / drying means is provided with a mixing and stirring mechanism having a rotary blade in the lower part of the heating chamber, and is configured to uniformly irradiate microwaves while mixing and stirring the object to be heated.

【0007】一方、連続方式は、ベルトコンベアが加熱
室を貫通し移動するようになっており、このベルトコン
ベアで被加熱物を連続的に加熱室に搬入し、加熱室内の
移動中に一定時間マイクロ波を照射せしめて加熱乾燥を
行なうものであるが、この連続方式においては、ベルト
コンベアの搬送ベルトに載せる被加熱物の積み高さ及び
積み幅が加熱の均一性に大きな影響を与える。
On the other hand, in the continuous system, the belt conveyor moves through the heating chamber, and the object to be heated is continuously carried into the heating chamber by this belt conveyor, and a certain period of time is maintained during the movement in the heating chamber. Although heating and drying are performed by irradiating microwaves, in this continuous method, the stacking height and stacking width of the objects to be heated placed on the conveyor belt of the belt conveyor have a great influence on the heating uniformity.

【0008】すなわち、積み高さについては、余り高く
積み過ぎると、内方の被加熱物と外方の被加熱物とで温
度差が生じ、また、積み高さが低すぎても加熱によるラ
ンナウェ−現象が発生する。積み幅については、周波数
が1000〜3000MHzの波長を使用するマイクロ
波加熱装置においては、定在波の関係で加熱むらが発生
するので、被加熱物に対して積み幅を選定する必要があ
る。
In other words, regarding the stacking height, if the stacking height is too high, a temperature difference will occur between the inner heated object and the outer heated object, and if the stacked height is too low, the runner weight due to heating will increase. -A phenomenon occurs. Regarding the stacking width, in a microwave heating device using a wavelength of 1000 to 3000 MHz, uneven heating occurs due to standing waves, so it is necessary to select the stacking width for the object to be heated.

【0009】したがって、連続方式においても、ベルト
コンベアの被加熱物の積載量が制限されるので、大量処
理の装置でありながら大きな期待はもてない。また、一
般の水分乾燥となる加熱においては、ベルトコンベア接
触面での放熱、水分蒸発の遅れ、結露などの発生が見ら
れ、ベルトコンベアの影響を無視することができない。
さらに、被加熱物を高温加熱(例えば、120℃〜35
0℃)する場合には、熱風を併用したり、スタラモ−ド
ファンを取付けてマイクロ波を撹拌しても、ランナウェ
−現象を取り除くことが難かしい。
Therefore, even in the continuous system, since the load of the article to be heated on the belt conveyor is limited, it is not a great expectation although it is an apparatus for mass processing. Further, in the heating for general moisture drying, heat release, moisture evaporation delay, dew condensation, etc. are observed on the contact surface of the belt conveyor, and the influence of the belt conveyor cannot be ignored.
Further, the object to be heated is heated to a high temperature (for example, 120 ° C to 35 ° C).
In the case of 0 ° C.), it is difficult to remove the runaway phenomenon even if hot air is used together or a stirrer mode fan is attached to stir the microwave.

【0010】そこで、このような問題を解決するため、
本発明の出願人は、被加熱物をスクリュ−で撹拌しなが
らマイクロ波を照射する加熱乾燥手段を実用新案登録第
1624811号として既に提案してある。この加熱乾
燥手段は、加熱室の下部を半円筒状の底壁で囲んで断面
U字状の溝状部を形成し、このU字状溝内に被加熱物を
移送するスクリュ−を備えた混合撹拌機構を備え、この
スクリュ−の回転で被加熱物を混合撹拌しながらマイク
ロ波を照射して均一加熱する構成となっている。
Therefore, in order to solve such a problem,
The applicant of the present invention has already proposed, as a utility model registration No. 1624811, a heating and drying means for irradiating microwaves while stirring an object to be heated with a screw. This heating / drying means is provided with a screw which surrounds the lower part of the heating chamber with a semi-cylindrical bottom wall to form a groove-shaped portion having a U-shaped cross section and which transfers the object to be heated into the U-shaped groove. A mixing / stirring mechanism is provided, and the object to be heated is mixed and stirred by the rotation of this screw to uniformly irradiate microwaves.

【0011】[0011]

【発明が解決しようとする課題】しかしながら、上記し
た被加熱物を混合撹拌しながらマイクロ波を照射する従
来の加熱乾燥方法は次のような問題点がある。上記した
ように、バッチ方式の場合は被加熱物が撹拌羽根によっ
て撹拌され、連続方式の場合はスクリュ−によって被加
熱物の撹拌及び移送が行なわれる。そして、この被加熱
物を効率良く撹拌、移送するためには加熱室壁と上記し
た撹拌羽根又はスクリュ−との隙間をできる限り小さく
する必要がある。
However, the conventional heating and drying method of irradiating microwaves while mixing and stirring the above-mentioned object to be heated has the following problems. As described above, in the batch system, the object to be heated is agitated by the stirring blade, and in the continuous system, the object to be heated is agitated and transferred by the screw. In order to efficiently stir and transfer this object to be heated, it is necessary to make the gap between the heating chamber wall and the stirring blade or screw as small as possible.

【0012】撹拌羽根及びスクリュ−の材質は加工性、
経済性を考慮すると金属製となるが、上記した隙間が1
〜3mm以下(マイクロ波出力条件によって異なる)に
なると、マイクロ波照射中にこの隙間で放電が起こり、
スパ−クを発生し被加熱物に引火することがある。ま
た、上記した放電が起こらないように隙間を大きくする
と、隙間の被加熱物が混合、移送されずに残留し、この
残留した被加熱物が均一加熱されなくなるし、また排出
されなくなってしまう。
The materials of the stirring blade and the screw are workability,
It is made of metal in consideration of economy, but the above gap is 1
When it is less than ~ 3 mm (depending on the microwave output condition), discharge occurs in this gap during microwave irradiation,
Sparks may be generated and the object to be heated may catch fire. If the gap is enlarged so that the above-mentioned discharge does not occur, the objects to be heated in the gaps remain without being mixed and transferred, and the remaining objects to be heated are not uniformly heated and are not discharged.

【0013】一方、マイクロ波は加熱室壁の金属面で反
射し、距離が離れるにしたがい電界が強くなる。図4に
示す如く、反射面での電界強度はゼロで、1/4波長の
距離で最大となり、その後減少し1/2波長の距離でゼ
ロとなる。このように、一波長の間に電界強度が最大と
なる位置は1/4波長と3/4波長の2ケ所存在する。
マイクロ波エネルギ−を利用して加熱する場合、電界強
度が存在しなければ被加熱物の発熱は起こらないため、
加熱室内壁に残留している被加熱物は加熱されないこと
になる。
On the other hand, the microwave is reflected by the metal surface of the heating chamber wall, and the electric field becomes stronger as the distance increases. As shown in FIG. 4, the electric field strength at the reflecting surface is zero, the maximum at the distance of ¼ wavelength, and then the electric field strength decreases to zero at the distance of ½ wavelength. As described above, there are two positions where the electric field strength is maximum within one wavelength, that is, a quarter wavelength and a quarter wavelength.
When heating using microwave energy, the heat of the object to be heated does not occur unless electric field strength exists,
The object to be heated remaining on the inner wall of the heating chamber is not heated.

【0014】そこで、隙間をできる限り小さくし、か
つ、放電が起こらないよう撹拌羽根及びスクリュ−の材
質を非金属製にするか、または、金属表面をテフロンコ
−ティングする方法も考えられるが、大型の生産設備に
おいては製作が難かしく、また、高価なものとなるので
経済的にも問題がある。本発明は、上記した問題点を解
決することを目的とする。
Therefore, it is conceivable to make the gap as small as possible and use a non-metallic material for the stirring blade and the screw so as not to generate an electric discharge, or a method of coating the metal surface with Teflon. It is difficult to manufacture in the production facility and it is expensive, so there is an economical problem. The present invention aims to solve the above-mentioned problems.

【0015】[0015]

【課題を解決するための手段】上記した目的を達成する
ため、本発明では、底面部が金属製のマイクロ波加熱室
で、粉粒状や顆粒状の被加熱物にマイクロ波を照射して
加熱乾燥させる方法において、底面部を多孔構造とした
上記マイクロ波加熱室に、その底面部の外側より風圧力
を加え、被加熱物をマイクロ波の少なくとも1/4波長
の距離まで底面部から浮遊させ、この浮遊状態で被加熱
物を回転撹拌機構によって混合撹拌しながらマイクロ波
を照射して加熱乾燥させることを特徴とするマイクロ波
による浮遊加熱乾燥法を提案する。また、上記した発明
において、上記被加熱物を浮遊させる風圧力気体の温度
及び湿度を所定値に設定し、マイクロ波の出力エネルギ
−を被加熱物の温度にしたがって調整制御することを特
徴とするマイクロ波による浮遊加熱乾燥法を提案する。
In order to achieve the above object, according to the present invention, a microwave heating chamber having a bottom portion made of metal is used to heat a powdery or granular object to be heated by microwaves. In the drying method, wind pressure is applied to the microwave heating chamber having a bottom surface having a porous structure from the outside of the bottom surface to float the object to be heated from the bottom up to a distance of at least 1/4 wavelength of microwaves. In this floating state, we propose a method of floating heating and drying by microwaves, which heats and dries by irradiating microwaves while mixing and stirring the object to be heated by a rotary stirring mechanism. Further, in the above-mentioned invention, the temperature and humidity of the wind pressure gas in which the object to be heated is suspended are set to predetermined values, and the output energy of the microwave is adjusted and controlled according to the temperature of the object to be heated. We propose a floating heating method using microwaves.

【0016】[0016]

【作用】マイクロ波加熱室の底面部は金属製で多孔構造
をなしている。この底面部の外側からある一定の風圧力
を加えて被加熱物をマイクロ波の1/4波長程度の距離
まで底面部から浮遊させると共に、この浮遊状態で被加
熱物を混合撹拌機構によって混合撹拌する。これより、
被加熱物はマイクロ波加熱室の底面部から一定距離浮遊
した状態で撹拌されるので均一に混合撹拌される。そし
て、上記のように混合撹拌される被加熱物はマイクロ波
の照射による最も大きいエネルギ−のところで加熱され
るため、均一に加熱乾燥されることになる。
[Function] The bottom of the microwave heating chamber is made of metal and has a porous structure. A certain amount of wind pressure is applied from the outside of the bottom surface to float the object to be heated from the bottom surface to a distance of about ¼ wavelength of microwaves, and the object to be heated is mixed and stirred by the mixing and stirring mechanism in this floating state. To do. Than this,
The object to be heated is agitated in a state of floating for a certain distance from the bottom of the microwave heating chamber, so that it is uniformly mixed and agitated. The object to be mixed and stirred as described above is heated at the highest energy level due to the irradiation of microwaves, so that it is uniformly heated and dried.

【0017】また、被加熱物を浮遊させる気体の温度、
湿度は、被加熱物の種類によって設定し、更に、被加熱
物の温度が高くなり、残留水分が減少する減率乾燥期に
おいては、被加熱物の温度にしたがって、照射するマイ
クロ波エネルギ−量も減少するように制御する。
The temperature of the gas in which the object to be heated is suspended,
Humidity is set according to the type of object to be heated, and during the rate-decreasing drying period when the temperature of the object to be heated rises and the residual water content decreases, the amount of microwave energy applied according to the temperature of the object to be heated. Also, control to decrease.

【0018】[0018]

【実施例】次に、本発明の実施例について図面に沿って
説明する。図1はマイクロ波加熱装置の簡略図であり、
本発明をバッチ方式で実施した場合の実施例を示してい
る。
Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a simplified diagram of a microwave heating device,
An example when the present invention is carried out by a batch method is shown.

【0019】1はマイクロ波加熱室、2は加熱室1の底
面部で、この底面部2は金属製の板材で形成され、多数
の小孔2aが設けられた多孔構造のものとなっている。
加熱室1の底面部直上には、モ−タ3の駆動で回転して
被加熱物4を撹拌する混合撹拌機構としての撹拌羽根5
が支軸6によって軸受けされた回転軸に回転自在に軸支
されている。
Reference numeral 1 is a microwave heating chamber, 2 is a bottom portion of the heating chamber 1, and this bottom portion 2 is made of a metal plate material and has a porous structure provided with a large number of small holes 2a. ..
Immediately above the bottom surface of the heating chamber 1, a stirring blade 5 as a mixing and stirring mechanism that rotates by driving the motor 3 to stir the object 4 to be heated
Are rotatably supported by a rotary shaft supported by a support shaft 6.

【0020】被加熱物4を浮遊させる風は、送風機7に
より熱風発生機8を経由して加熱室1の下方に形成した
下部チャンバ−9に送風され、底面部2の小孔2aより
加熱室1に吹き込まれる。また、下部チャンバ−9には
温度センサ10が設けられ、上記した熱風の温度が一定
に制御されるようになっている。加熱室1の天井部には
被加熱物4より吸湿した空気を排出する排気口11がマ
イクロ波の漏洩フィルタを介して接続され、排気口11
の先端には排気量をコントロ−ルする排気ダンパ−12
が備えられている。
The air that floats the object to be heated 4 is blown by the air blower 7 through the hot air generator 8 to the lower chamber 9 formed below the heating chamber 1, and the small chamber 2a of the bottom face 2 causes the heating chamber to flow. Blown in 1. Further, the lower chamber 9 is provided with a temperature sensor 10 so that the temperature of the hot air described above is controlled to be constant. An exhaust port 11 for discharging the air absorbed by the object to be heated 4 is connected to the ceiling of the heating chamber 1 through a microwave leakage filter, and the exhaust port 11
Exhaust damper 12 that controls the displacement at the tip of
Is provided.

【0021】マイクロ波はマイクロ波発振機13より発
振されて導波管14を通り加熱室1内に照射されるが、
加熱室1内の熱風が導波管14を通ってマイクロ波発振
機13まで到達しないように導波管14の先端部にマイ
クロ波を吸収しない材質、本実施例ではテフロン材を用
いたシ−ル板15が設けられている。
The microwave is oscillated by the microwave oscillator 13 and radiated through the waveguide 14 into the heating chamber 1.
In order to prevent the hot air in the heating chamber 1 from passing through the waveguide 14 to reach the microwave oscillator 13, a material that does not absorb microwaves at the tip of the waveguide 14, a sheet made of Teflon material in this embodiment is used. A rule plate 15 is provided.

【0022】被加熱物4の供給は、原料供給タンク16
より送風機17で加熱室1内に送り込まれる。18は供
給弁である。加熱乾燥が終わった被加熱物4を取出す場
合は、供給弁18、排気ダンパ−12が閉じ、取出口の
弁19がエア−シリンダ20によって開口状態となり、
被加熱物4が接続するサイクロン21でロ−タリ−バル
ブ22を経て回収容器23に集められる。この時の排出
は、送風機7の風力で行なわれるが、被加熱物4の密度
や形態でサイクロン21までの圧送が難かしい場合は、
サイクロン21の上部に設けられたファン24を使用す
る。扉25は加熱室1の点検、掃除用のために設けられ
た点検扉で、加熱室1内を水洗いした場合はバルブ26
を開放してドレン抜きを行なう。
The material to be heated 4 is supplied by the raw material supply tank 16
The air is blown into the heating chamber 1 by the blower 17. 18 is a supply valve. When the object 4 to be heated, which has been dried by heating, is taken out, the supply valve 18 and the exhaust damper 12 are closed, and the valve 19 at the outlet is opened by the air-cylinder 20,
The object to be heated 4 is collected in the collecting container 23 through the rotary valve 22 in the cyclone 21 to which it is connected. The discharge at this time is performed by the wind force of the blower 7, but if it is difficult to press the cyclone 21 due to the density and form of the object to be heated 4,
A fan 24 provided above the cyclone 21 is used. The door 25 is an inspection door provided for inspecting and cleaning the heating chamber 1, and a valve 26 when the inside of the heating chamber 1 is washed with water.
Open and drain.

【0023】被加熱物4は原料の種類によってマイクロ
波エネルギ−の投入量が調整制御される構成となってい
る。被加熱物4は原料の種類によって予め最適加熱温度
を定め、この最適加熱温度は比較演算部27に設定され
る。
The object to be heated 4 is constructed so that the amount of microwave energy input is adjusted and controlled depending on the type of raw material. The optimum heating temperature of the object 4 to be heated is determined in advance according to the type of raw material, and the optimum heating temperature is set in the comparison calculation unit 27.

【0024】加熱乾燥中の被加熱物4は、その品温が電
波漏洩対策とエアパ−ジの施されたフィルタ28を介し
て温度センサ29で測定され、この測定信号が上記した
比較演算部27に取り込まれて上記した最適加熱温度と
比較される。比較演算部27は品温が最適加熱温度を超
えた場合にマイクロ波発振器13が備える出力制御回路
を制御し、マイクロ波出力を自動制御する。これによ
り、温度に敏感で品質を損なう原料を加熱乾燥させる場
合にも最適加熱温度を超えて加熱することがないので、
良好な加熱乾燥方法となる。
The temperature of the article to be heated 4 being heated and dried is measured by a temperature sensor 29 through a filter 28 provided with a radio wave leakage countermeasure and an air purge, and this measurement signal is used as a comparison calculation section 27. And is compared with the above-mentioned optimum heating temperature. The comparison calculation unit 27 controls the output control circuit included in the microwave oscillator 13 when the product temperature exceeds the optimum heating temperature, and automatically controls the microwave output. As a result, even when heating and drying raw materials that are sensitive to temperature and impair quality, the heating will not exceed the optimum heating temperature.
It becomes a good heat drying method.

【0025】また、被加熱物4の品温を検出する温度セ
ンサ29には赤外線放射温度計を利用すると、非接触で
計測できる上に、送風温度の影響もなく、さらに、その
温度値に対応した電気信号を高速で得ることができ、マ
イクロ波出力制御の温度センサ29として有効である。
If an infrared radiation thermometer is used as the temperature sensor 29 for detecting the temperature of the article to be heated 4, it can be measured in a non-contact manner, there is no influence of the blowing temperature, and the temperature value can be dealt with. The electric signal can be obtained at high speed and is effective as the temperature sensor 29 for controlling the microwave output.

【0026】次に、被加熱物4の浮遊混合撹拌方法につ
いて説明する。我国における工業加熱に使用されるマイ
クロ波の周波数は2450±50MHzが主力である。
この周波数帯の波長の長さはλ=122.5mmとな
り、λ/4は約30.6mmとなる。
Next, a method of floating and mixing the object 4 to be heated will be described. The frequency of microwave used for industrial heating in Japan is mainly 2450 ± 50 MHz.
The wavelength length of this frequency band is λ = 122.5 mm, and λ / 4 is about 30.6 mm.

【0027】加熱室1内には、ある流速をもつ熱風が底
面部2の多数の小孔2aより吹き上げる。加熱室1の底
面部2に充填された被加熱物4は、熱風の流速が遅い段
階では静止したままであるが、流速を速めると、静止状
態を保つことができなくなり上下運動する浮遊状態とな
る。ここで、熱風の流速は被加熱物4が加熱室1の底面
部2から1/4波長に当る約30mm浮遊する程度に保
たれる。
In the heating chamber 1, hot air having a certain flow velocity is blown up from a large number of small holes 2a in the bottom portion 2. The object 4 to be heated, which is filled in the bottom surface 2 of the heating chamber 1, remains stationary when the flow velocity of the hot air is slow, but when the flow velocity is increased, it becomes impossible to maintain the stationary state and the floating state moves up and down. Become. Here, the flow velocity of the hot air is maintained such that the object to be heated 4 floats from the bottom surface 2 of the heating chamber 1 by about 30 mm, which corresponds to a quarter wavelength.

【0028】上記した被加熱物4の浮遊状態において、
撹拌羽根5によって被加熱物4を撹拌すると、被加熱物
4は加熱室1の底面部2から浮遊した状態で回転しなが
ら混合撹拌される。そして、この浮遊混合撹拌状態にお
いてマイクロ波を照射して被加熱物4を加熱乾燥させ
る。
In the floating state of the object 4 to be heated,
When the object 4 to be heated is stirred by the stirring blades 5, the object 4 to be heated is mixed and stirred while rotating from the bottom surface portion 2 of the heating chamber 1 while rotating. Then, in this floating mixed stirring state, microwaves are irradiated to heat and dry the object to be heated 4.

【0029】このように、被加熱物4をマイクロ波エネ
ルギ−の最大位置に浮遊させて混合撹拌することによ
り、加熱乾燥が効果的に行なわれ、また、加熱室1内壁
と撹拌羽根5との隙間に被加熱物4が残留することがな
くなると共に、互いの材質が金属性であっても、スパ−
クの発生しない充分な間隙を取ることができる。
As described above, by heating the object to be heated 4 at the maximum position of microwave energy and mixing and stirring, heating and drying are effectively performed, and the inner wall of the heating chamber 1 and the stirring blade 5 are combined. The object to be heated 4 does not remain in the gap, and even if the mutual materials are metallic,
It is possible to create a sufficient gap that does not cause scratches.

【0030】次に、図2、図3は本発明を連続方式で実
施した場合の実施例を示し、図2は加熱装置の簡略的な
正面図、図3は同加熱装置の簡略的な側面図である。
Next, FIGS. 2 and 3 show an embodiment in which the present invention is carried out in a continuous system. FIG. 2 is a simplified front view of the heating device, and FIG. 3 is a simplified side view of the heating device. It is a figure.

【0031】これら図において、50はマイクロ波加熱
室、51は加熱室50の底面部で、この底面部51は金
属製で半円筒状をなし、多数の小孔51aが形成されて
いる。更に、底面部51の下側には熱風を均一に吹き上
げるための下部チャンバ−52が形成されている。被加
熱物53を浮遊させる熱風は、送風機54から熱風発生
機55を経て下部チャンバ−52に送風され、底面部5
1より均一に加熱室50内に吹き込まれる。
In these figures, 50 is a microwave heating chamber, 51 is the bottom surface of the heating chamber 50, this bottom surface 51 is made of metal and has a semi-cylindrical shape, and a large number of small holes 51a are formed. Further, a lower chamber-52 for uniformly blowing hot air is formed below the bottom surface portion 51. The hot air that floats the object to be heated 53 is blown from the blower 54 through the hot air generator 55 to the lower chamber 52, and the bottom surface portion 5
1 is blown into the heating chamber 50 more uniformly.

【0032】被加熱物53は原料供給タンク56より供
給フィダ−57によって連続的に加熱室50に投下さ
れ、U字状に形成された底面部51にモ−タ58の駆動
で回転する移送用スクリュ−59で、浮遊する被加熱物
53を混合撹拌しながら取出し口まで移動させ、取出口
に備えたロ−タリ−バルブ60により排出される。
The object 53 to be heated is continuously dropped from the raw material supply tank 56 into the heating chamber 50 by the supply feeder 57, and is transferred by the drive of the motor 58 to the bottom 51 formed in a U shape. With the screw 59, the floating object 53 to be heated is moved to the outlet while being mixed and stirred, and is discharged by the rotary valve 60 provided at the outlet.

【0033】また、被加熱物53は移送される間にマイ
クロ波が照射される。マイクロ波は、マイクロ波発振機
61より発振されて導波管63の先端の照射口より照射
される。63はテフロン材を用いたシ−ル板である。被
加熱物53の蒸発水分は、加熱室50の天井部に設けら
れた排気口64から排気ダンパ−65を経て排気され
る。
The object 53 to be heated is irradiated with microwaves while being transferred. The microwave is oscillated by the microwave oscillator 61 and emitted from the irradiation opening at the tip of the waveguide 63. 63 is a seal plate using a Teflon material. The evaporated water of the heated object 53 is exhausted from the exhaust port 64 provided in the ceiling of the heating chamber 50 through the exhaust damper 65.

【0034】上記した連続方式の場合も、バツチ方式の
場合と同様、被加熱物53をU字状に形成した加熱室5
0の底面部51より1/4波長程度浮遊させて混合撹拌
することにより、被加熱物53が残留することなく均一
に混合撹拌されて移送、排出される。また、U字状に形
成した加熱室50の底面部51とスクリュ−59が互い
に金属製であっても、スパ−クの発生しない充分な間隙
を取ることができる。
Also in the case of the continuous method described above, as in the case of the batch method, the heating chamber 5 in which the object 53 to be heated is formed in a U shape.
By suspending about 1/4 wavelength from the bottom surface 51 of 0 and mixing and stirring, the object 53 to be heated is uniformly mixed and stirred without being left, and is transferred and discharged. Further, even if the bottom surface portion 51 of the heating chamber 50 formed in a U shape and the screw 59 are made of metal, it is possible to provide a sufficient gap without causing sparks.

【0035】なお、上記した連続方式の場合においても
バツチ方式の場合と同様、図示しない比較演算部を備え
て、被加熱物53の種類によってマイクロ波エネルギ−
の投入量が調整制御される構成となっている。
In the case of the continuous method described above, as in the case of the batch method, a comparison operation unit (not shown) is provided, and the microwave energy depending on the type of the object 53 to be heated.
The input amount is adjusted and controlled.

【0036】また、本実施例では、熱風発生機8、54
に電熱ヒ−タを使用した一例について説明したが、蒸気
や燃焼ガス等のエネルギ−を用いることも可能であり、
また、マイクロ波加熱室の底面部はパンチングプレ−
ト、金網、スクリ−ンなどで多孔板として構成すること
ができる。
Further, in this embodiment, the hot air generators 8, 54
Although an example of using an electric heat heater has been described above, it is also possible to use energy such as steam or combustion gas,
In addition, the bottom of the microwave heating chamber has a punching plate.
It can be configured as a perforated plate with a grate, a wire mesh, a screen, or the like.

【0037】次に、本発明の加熱乾燥方法を実際に実験
して得られる具体的なデ−タを示す。 「実験例−1」 (1)被加熱物:モヤシ豆(中国産) グリ−ン豆種、ブラック豆種の2種類 (2)目的:加熱殺菌 (3)使用装置及び条件 (a)バッチ式マイクロ波浮遊加熱乾燥装置 (イ)マイクロ波加熱室形状:円錐状 (ロ)マイクロ波加熱室寸法:底面部外径500φmm 上部外径1000φmm 円錐高さ1000mm (ハ)多孔板:孔径1.0φmm、メッシュ330.
8、開孔率40.3% (ニ)送風機及び熱風発生機 最大風量:13m3/分、最大静圧120mmAq、4
00W、50Hz 熱風温度:0〜300℃ (ホ)撹拌機:0.75kW、回転数:0〜25rpm (ヘ)マイクロ波発振機 出力:0〜5kW 周波数:2450±30MHz (ト)赤外温度計:米国バ−ンズ社製モデルKT−14
P 測温範囲:0〜100℃ 出力電圧:0〜1V (b)条件 (イ)各サンプル量:7000g (ロ)熱風温度:80℃(一定温度) (ハ)マイクロ波出力:3000W(出力一定) (4)結果温度
Next, concrete data obtained by actually conducting an experiment on the heating and drying method of the present invention will be shown. "Experimental Example-1" (1) Object to be heated: bean sprouts (from China) Green beans and black beans (2) Purpose: heat sterilization (3) Equipment and conditions (a) Batch type Microwave floating heating and drying device (a) Microwave heating chamber shape: conical (b) Microwave heating chamber dimensions: bottom surface outer diameter 500φ mm upper outer diameter 1000 φmm cone height 1000 mm (c) perforated plate: pore diameter 1.0 φmm, Mesh 330.
8. Opening rate 40.3% (d) Blower and hot air generator Maximum air volume: 13 m 3 / min, maximum static pressure 120 mmAq, 4
00 W, 50 Hz Hot air temperature: 0 to 300 ° C. (e) Stirrer: 0.75 kW, rotation speed: 0 to 25 rpm (f) Microwave oscillator output: 0 to 5 kW Frequency: 2450 ± 30 MHz (g) Infrared thermometer : Model KT-14 manufactured by Burns, Inc., USA
P Temperature measurement range: 0 to 100 ° C Output voltage: 0 to 1V (b) Conditions (a) Each sample amount: 7000g (b) Hot air temperature: 80 ° C (constant temperature) (c) Microwave output: 3000W (constant output) ) (4) Result temperature

【0038】[0038]

【表1】 [Table 1]

【0039】「実験例−2」 (1)被加熱乾燥物:ソフトカプセル (2)目 的:ソフトカプセルの乾燥 (3)使用装置 (イ)実験例−1と同じ装置であるが送風側には冷凍機
による除湿空気を使用 (ロ)プレク−ラ−(冷凍機) 空冷式:日立製作所製304Hz−AL型2.2kW 冷凍能力:5.830/6.700(Kcal/H)、
50/60Hz、蒸発温度0℃ (ハ)アフタ−ヒ−タ− 電熱ヒ−タ− 3.5kW 給気ファン 0.125kW、5m3/分 (4)条件 (イ)送風温度:30℃ 相対湿度 17% (ロ)マイクロ波出力:100W〜450W(出力可
変) (ハ)撹拌回転数:1〜3rpm (5)含水率の結果
"Experimental Example-2" (1) Heated dried product: Soft capsule (2) Aim: Drying of soft capsule (3) Equipment used (a) The same equipment as Experimental Example-1, but frozen on the blast side. Dehumidified air is used by the machine (b) Precurler (refrigerator) Air cooling type: Hitachi 304Hz-AL type 2.2kW Refrigerating capacity: 5.830 / 6.700 (Kcal / H),
50/60 Hz, evaporation temperature 0 ° C (C) After-heater Electric heating heater 3.5 kW Air supply fan 0.125 kW, 5 m 3 / min (4) Conditions (A) Blower temperature: 30 ° C Relative humidity 17% (b) Microwave output: 100 W to 450 W (variable output) (c) Stirring speed: 1 to 3 rpm (5) Result of water content

【0040】[0040]

【表2】 [Table 2]

【0041】「実験例−3」 (1)被加熱物:玄米 (2)目 的:玄米の調質 (3)使用装置 連続式マイクロ波浮遊加熱乾燥装置 (イ)スクリュ−コンベア外径:500φmm (ロ)スクリュ−コンベア回転数:0〜20rpm (ハ)マイクロ波加熱室長さ:1800mm (ニ)送風機:最大静圧 290mmg、最大風量 3
6m3/分、1.5kW、50Hz (ヘ)マイクロ波発振機 出力:0〜5kW×3台=0〜15kW 周波数:2450±30MHz (4)玄米の調質条件 玄米の初期温度:9℃ 玄米の初期含水率:14.5%(W.B) 玄米調質温度:20℃ 玄米調質含水率:16%
"Experimental Example-3" (1) Heated object: Brown rice (2) Purpose: Conditioning of brown rice (3) Equipment used Continuous microwave floating heating dryer (a) Screw conveyor outer diameter: 500 mm (B) Screw conveyor rotation speed: 0 to 20 rpm (c) Microwave heating chamber length: 1800 mm (d) Blower: maximum static pressure 290 mmg, maximum air volume 3
6 m 3 / min, 1.5 kW, 50 Hz (f) Microwave oscillator output: 0~5kW × 3 units = 0~15KW Frequency: 2450 ± 30MHz (4) of the refining conditions brown rice brown initial temperature: 9 ° C. Brown Rice Initial moisture content: 14.5% (WB) Brown rice conditioning temperature: 20 ° C Brown rice conditioning water content: 16%

【0042】(5)処理条件と結果 マイクロ波加熱室に玄米が投入される直前で温水による
スプレ−で玄米を加湿する。 処理量:20kg/分(毎時1200kg) 熱風温度:35℃ UHF出力:15kW ロ−タ−リ−バルブ出口の玄米の温度:20±1℃ 玄米調質後の含水率:15.7%
(5) Treatment Conditions and Results Just before the brown rice is put into the microwave heating chamber, the brown rice is humidified by spraying with warm water. Throughput: 20 kg / min (1200 kg / hr) Hot air temperature: 35 ° C UHF output: 15 kW Temperature of brown rice at the outlet of the rotary valve: 20 ± 1 ° C Water content after conditioning brown rice: 15.7%

【0043】以上、浮遊加熱乾燥方法についての実験例
を上げたが、実験例−1のモヤシ豆においては、本発明
の方法によりその均一加熱性を発芽率で説明したもので
ある。
The experimental examples of the floating heating and drying method have been described above, and in the bean sprouts of Experimental Example-1, the uniform heating property is explained by the germination rate by the method of the present invention.

【0044】我国の食卓に上るモヤシは、中国、ベトナ
ム等の諸国より輸入される豆が多く、業者が室温30〜
40℃、湿度80%以上の雰囲気の部屋で充分に浸水し
た発芽床に豆を蒔き数日間で発芽させてモヤシに成長さ
せている。
Most of the bean sprouts on our table are beans imported from countries such as China and Vietnam.
Beans are sown on a germinated bed that is fully submerged in a room with an atmosphere of 40 ° C and a humidity of 80% or more, and germinated in a few days to grow into sprouts.

【0045】しかし、輸入したままではカビや病気に感
染していることが多く、発芽率は90%を割ることが多
い(その年度の気候、保管条件によって異なる)。その
為に一般には、病気の感染を防止し発芽率を上げるため
に加熱殺菌処理が行われている。従来は熱風加熱で30
〜40時間程度かかつて70〜75℃に昇温している。
しかし、本発明によれば、従来方法に比べて短時間とな
るため、モヤシ豆にダメ−ジを与えずに加熱殺菌できる
こととなり非常に高い発芽率を得ることができる。これ
は均一加熱化を証明したものと言える。
However, as they are imported, they are often infected with mold and diseases, and the germination rate often falls below 90% (depending on the climate and storage conditions of the year). Therefore, in general, heat sterilization treatment is performed to prevent infection of diseases and increase the germination rate. Conventionally, hot air heating is 30
The temperature has been raised to 70 to 75 ° C for about 40 hours or so.
However, according to the present invention, the time required is shorter than that of the conventional method, and thus heat sterilization can be performed without giving damage to the bean sprouts, and a very high germination rate can be obtained. This can be said to prove uniform heating.

【0046】実験例−2で使用したソフトカプセルは、
内部が液状、ペ−スト状の医薬品、健康食品をゼラチン
フイルムでカプセル化したもので、一般にソフトカプセ
ルと言われている。内容物が熱に対して敏感な製品とな
るため、ゼラチンカプセルを乾燥させる場合40℃以下
で行なう必要がある。薬液が充填された直後のソフトカ
プセルの含水率は20〜25%前後の含水率があるが、
10%以下に乾燥してカプセルとしての強度を持たせて
市販されている。
The soft capsule used in Experimental Example-2 was
A liquid medicine, a paste medicine, and a health food are encapsulated with a gelatin film, and are generally called soft capsules. Since the content becomes a heat-sensitive product, it is necessary to dry the gelatin capsule at 40 ° C. or lower. The water content of the soft capsule immediately after being filled with the chemical solution is about 20 to 25%,
It is commercially available after being dried to 10% or less to have strength as a capsule.

【0047】ゼラチン質の乾燥はタンパク質が変化し易
く、また表皮に膜が張りやすいため、乾燥温度、速度を
上げることが出来ず、従来の棚式の恒温、恒湿乾燥法で
は、トレイの上に薄く広げて散布し、15〜25時間程
度の乾燥を必要とし生産性を大きく妨げている。
In the drying of gelatinous material, the protein is easily changed and the film is easily formed on the epidermis, so that the drying temperature and speed cannot be increased. In the conventional shelf type constant temperature and constant humidity drying method, And spread it thinly and spray it for about 15 to 25 hours, which greatly hinders productivity.

【0048】本発明方法のように、除湿乾燥空気を浮遊
させる風力を利用し、さらに、マイクロ波エネルギ−を
併用すれば、大幅な時間短縮が計れるだけでなく、浮遊
撹拌することでソフトカプセル間の付着が防止でき、そ
の上、均一で良好なソフトカプセルの乾燥を行うことが
できる。
As in the method of the present invention, if a wind force for suspending dehumidified dry air is used and microwave energy is used together, not only a great reduction in time can be achieved, but also floating stirring can be performed between the soft capsules. Adhesion can be prevented, and moreover, uniform and good soft capsules can be dried.

【0049】実験例−3は本発明方法を連続式として実
験した玄米加熱のデ−タである。大型精米工場では搗精
の米処理として、玄米の温度、水分を調整する、いわゆ
る玄米調質を行なうことが多い。搗精特性は玄米の温度
と水分で決定される玄米の剛度により大きな影響を受け
るためで、精白米の品質及び食味から求めて、その最適
玄米温度、水分は各々15〜20℃、15.5〜16.
5%(W.B)と言われている。特に、冬期の寒冷地に
おける精米工場では、加工能率、搗精歩留の向上の面か
ら玄米調質が重要な工程となっている。
Experimental Example 3 is data for heating brown rice in which the method of the present invention was tested as a continuous system. At large rice mills, so-called brown rice conditioning is often performed as a rice treatment for milled rice by adjusting the temperature and water content of the brown rice. The polishing characteristics are greatly affected by the stiffness of brown rice, which is determined by the temperature and water content of the brown rice. Therefore, the optimum brown rice temperature and water content are 15 to 20 ° C and 15.5 to 15.5, respectively, based on the quality and taste of the polished rice. 16.
It is said to be 5% (WB). Particularly, in the rice mills in cold regions in winter, the brown rice conditioning is an important process from the viewpoints of improving the processing efficiency and the polishing yield.

【0050】従来は大型のタンク内に電気ヒ−タ−、ス
チ−ムヒ−タ−等を配置し、さらにタンク外壁をも加温
してその熱伝導で玄米を加温する方法が取られている。
大型精米工場では時間当りの処理量が多く、この様な方
式では、短時間に通過する玄米を全て均一に調質するこ
とは問題がある。
Conventionally, an electric heater, a steam heater or the like is arranged in a large tank, and the outer wall of the tank is also heated to heat the brown rice by its heat conduction. There is.
A large-scale rice mill has a large amount of treatment per hour, and with such a method, it is problematic to uniformly condition all brown rice that passes in a short time.

【0051】本発明の連続方式を利用すれば、加湿機の
調整とマイクロ波出力の調整で、求める条件の調質が簡
単に可能となり、また省エネルギ−で連続均一加熱がで
きる。
By using the continuous method of the present invention, it is possible to easily adjust the conditions required by adjusting the humidifier and adjusting the microwave output, and it is possible to perform continuous uniform heating with energy saving.

【0052】以上、各実施例について説明したが、本発
明によって加熱乾燥するものとしては、ゴム粉末、プラ
スチックペレット、セラミック粉末、顔料、薬品、穀
類、食品などの粒状、粉状、顆粒状の被加熱物が適し、
この他に、本発明はコ−ヒ−豆、ナッツ豆、ピ−ナッツ
豆等の焙煎や、スナック、米菓などの膨化工程の熱処理
加工に利用することができる。
Although the respective examples have been described above, examples of the material to be dried by heating according to the present invention include rubber powder, plastic pellets, ceramic powder, pigments, chemicals, grains, foods and the like, granular, powdery and granular materials. Heated material is suitable,
In addition to the above, the present invention can be used for roasting coffee beans, nut beans, peanut beans and the like, and for heat treatment of snacks, rice crackers and the like in the expansion step.

【0053】[0053]

【発明の効果】上記した通り、本発明のマイクロ波によ
る浮遊加熱乾燥法では、被加熱物をマイクロ波加熱室の
底面部からマイクロ波の1/4波長程度の距離まで浮遊
させ、この浮遊状態の被加熱物を均一に混合撹拌しなが
らマイクロ波を照射して加熱乾燥する構成としたので、
従来の加熱乾燥方法では難かしかった粉粒状や顆粒状の
被加熱物を確実に均一加熱乾燥することができる。
As described above, in the floating heating and drying method using microwaves of the present invention, the object to be heated is floated from the bottom of the microwave heating chamber to a distance of about ¼ wavelength of the microwaves, and the floating state is maintained. Since the object to be heated is uniformly mixed and stirred, it is heated and dried by irradiating the microwave,
It is possible to reliably uniformly heat and dry a powdery or granular object to be heated, which was difficult with the conventional heating and drying method.

【0054】また、被加熱物の種類が変っても、被加熱
物の品温を測定し、この測定値にしたがって照射するマ
イクロ波エネルギ−を調整すれば、被加熱物の種類に関
係なく容易に加熱乾燥することができる。
Even if the type of the object to be heated changes, if the temperature of the object to be heated is measured and the microwave energy for irradiation is adjusted according to the measured value, it is easy to perform regardless of the type of the object to be heated. It can be dried by heating.

【0055】さらに、粉粒物の加熱乾燥を主な目的とす
る従来の流動層乾燥法のように、大きな風量、風速を必
要としないために、バックフィルタやサイクロンの微粉
の捕集機構が不用となり、また、サニタリ−(汚染を除
くこと)の面でも保守管理が簡単となる。
Further, unlike the conventional fluidized bed drying method whose main purpose is to heat and dry the powder and granules, a large amount of air and air velocity are not required, so that a back filter and a cyclone fine powder collecting mechanism are not required. In addition, maintenance management becomes easier in terms of sanitary (removes contamination).

【0056】また、風量の低減に伴って熱風発生機や送
風機などが小形化できるので、省エネルギ−化と加熱時
間の短縮化に有利となる。
Further, since the hot air generator, the blower and the like can be downsized as the air volume is reduced, it is advantageous for saving energy and shortening the heating time.

【0057】さらに、静電気による粉塵爆発の危険、粒
体間の衝突と摩耗による微粉化の現象もほとんど発生し
ない非常に有効な加熱乾燥法となる。
Furthermore, this is a very effective heating and drying method in which the danger of dust explosion due to static electricity and the phenomenon of pulverization due to collision between particles and abrasion hardly occur.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明をバッチ方式として実施例した一例を示
すマイクロ波加熱装置の簡略図である。
FIG. 1 is a schematic view of a microwave heating apparatus showing an example in which the present invention is implemented as a batch system.

【図2】本発明を連続方式として実施した一例を示すマ
イクロ波加熱装置の簡略的な正面図である。
FIG. 2 is a schematic front view of a microwave heating device showing an example in which the present invention is carried out as a continuous system.

【図3】図2に示すマイクロ波加熱装置の簡略的な側面
図である。
FIG. 3 is a simplified side view of the microwave heating device shown in FIG.

【図4】マイクロ波加熱において波長と電界分布の関係
を示した説明図である。
FIG. 4 is an explanatory diagram showing the relationship between wavelength and electric field distribution in microwave heating.

【符号の説明】[Explanation of symbols]

1 マイクロ波加熱室 2 底面部 2a 小孔 4 被加熱物 5 撹拌羽根 8 熱風発生機 10 温度センサ 13 マイクロ波発振機 16 原料供給タンク 27 比較演算部 50 マイクロ波加熱室 51 底面部 51a 小孔 53 被加熱物 59 移送用スクリュ− 61 マイクロ波発振機 DESCRIPTION OF SYMBOLS 1 Microwave heating chamber 2 Bottom part 2a Small hole 4 Heated object 5 Stirring blade 8 Hot air generator 10 Temperature sensor 13 Microwave oscillator 16 Raw material supply tank 27 Comparison calculation part 50 Microwave heating chamber 51 Bottom part 51a Small hole 53 Object to be heated 59 Screw for transfer 61 Microwave oscillator

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 底面部が金属製のマイクロ波加熱室で、
粉粒状や顆粒状の被加熱物にマイクロ波を照射して加熱
乾燥させる方法において、底面部を多孔構造とした上記
マイクロ波加熱室に、その底面部の外側より風圧力を加
え、被加熱物をマイクロ波の少なくとも1/4波長の距
離まで底面部から浮遊させ、この浮遊状態で被加熱物を
回転撹拌機構によって混合撹拌しながらマイクロ波を照
射して加熱乾燥させることを特徴とするマイクロ波によ
る浮遊加熱乾燥法。
1. A microwave heating chamber whose bottom part is made of metal,
In a method of irradiating microwaves on a powdery or granular object to be heated by heating and drying, a microwave pressure is applied to the microwave heating chamber having a porous bottom surface from the outside of the bottom surface to heat the object to be heated. Microwaves are radiated from the bottom surface to a distance of at least ¼ wavelength of microwaves, and in this floating state, the object to be heated is irradiated with microwaves while being mixed and stirred by a rotary stirring mechanism, and is heated and dried. Floating drying method.
【請求項2】 上記被加熱物を浮遊させる風圧力気体の
温度及び湿度を所定値に設定し、マイクロ波の出力エネ
ルギ−を被加熱物の温度にしたがって調整制御すること
を特徴とする請求項1記載のマイクロ波による浮遊加熱
乾燥法。
2. The temperature and humidity of the wind pressure gas for floating the object to be heated are set to predetermined values, and the output energy of the microwave is adjusted and controlled according to the temperature of the object to be heated. The method of floating heating by microwave according to 1.
JP25714691A 1991-09-10 1991-09-10 Floating, heating and drying method with microwave Pending JPH0571871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25714691A JPH0571871A (en) 1991-09-10 1991-09-10 Floating, heating and drying method with microwave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25714691A JPH0571871A (en) 1991-09-10 1991-09-10 Floating, heating and drying method with microwave

Publications (1)

Publication Number Publication Date
JPH0571871A true JPH0571871A (en) 1993-03-23

Family

ID=17302354

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25714691A Pending JPH0571871A (en) 1991-09-10 1991-09-10 Floating, heating and drying method with microwave

Country Status (1)

Country Link
JP (1) JPH0571871A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102261822A (en) * 2011-05-19 2011-11-30 湖南科达粉体工程有限公司 Device for drying lignite by microwave fluidization
WO2012009859A1 (en) * 2010-07-23 2012-01-26 Lam Kwok Fai Microwave dryer and microwave drying method
CN102338547A (en) * 2010-07-23 2012-02-01 林国辉 Microwave drier and microwave drying method
JP2014021191A (en) * 2012-07-13 2014-02-03 Mitsubishi Chemicals Corp Apparatus for producing toner
JP2014196896A (en) * 2013-03-05 2014-10-16 四国計測工業株式会社 Microwave irradiation apparatus and method
CN112297286A (en) * 2020-09-24 2021-02-02 重庆优创电子科技有限公司 Special detectable moisture content's of modified plastics plastic granules drying-machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012009859A1 (en) * 2010-07-23 2012-01-26 Lam Kwok Fai Microwave dryer and microwave drying method
CN102338547A (en) * 2010-07-23 2012-02-01 林国辉 Microwave drier and microwave drying method
US9435585B2 (en) 2010-07-23 2016-09-06 Kwok Fai Lam Microwave dryer and microwave drying method
CN102261822A (en) * 2011-05-19 2011-11-30 湖南科达粉体工程有限公司 Device for drying lignite by microwave fluidization
JP2014021191A (en) * 2012-07-13 2014-02-03 Mitsubishi Chemicals Corp Apparatus for producing toner
JP2014196896A (en) * 2013-03-05 2014-10-16 四国計測工業株式会社 Microwave irradiation apparatus and method
CN112297286A (en) * 2020-09-24 2021-02-02 重庆优创电子科技有限公司 Special detectable moisture content's of modified plastics plastic granules drying-machine
CN112297286B (en) * 2020-09-24 2022-09-06 重庆百钰顺科技有限公司 Special detectable moisture content's of modified plastics plastic granules drying-machine

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