JP4004477B2 - Indirect heating type agitating dryer - Google Patents

Indirect heating type agitating dryer Download PDF

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JP4004477B2
JP4004477B2 JP2004049767A JP2004049767A JP4004477B2 JP 4004477 B2 JP4004477 B2 JP 4004477B2 JP 2004049767 A JP2004049767 A JP 2004049767A JP 2004049767 A JP2004049767 A JP 2004049767A JP 4004477 B2 JP4004477 B2 JP 4004477B2
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stirring
supply port
casing
stirring blade
raw material
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JP2005241095A (en
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晋 石原
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Kurimoto Ltd
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Description

この発明は、水分を含む食品や汚泥等の原料を攪拌しながら伝導加熱により乾燥させる間接加熱型攪拌乾燥機に関する。   The present invention relates to an indirect heating type agitation dryer that dries raw materials such as food and sludge containing moisture by conductive heating while stirring.

水分を含む食品や汚泥等の原料（被乾燥物）を乾燥させる装置には、原料を攪拌しながら伝導加熱により間接的に加熱して乾燥させるタイプのものがある。この種の間接加熱型攪拌乾燥機としては、一端側に供給口を、他端側に排出口を有するケーシングの両端間に回転軸を架け渡して、この回転軸の外周面に軸方向に所定の間隔で複数の扇形の攪拌羽根を取り付け、回転軸および各攪拌羽根を中空に形成したり、ケーシングの外側に中空のジャケットを設けて、これらの部材の中空部に熱媒体を通すことにより、供給口から連続的に供給される原料を、各攪拌羽根で攪拌しながら間接的に加熱して乾燥させ、ケーシング他端側へ移送して排出口から排出するものが多い（例えば、特許文献１、２参照。）。   As an apparatus for drying raw materials (substances to be dried) such as foods containing water and sludge, there is a type that is indirectly heated by conductive heating and dried while stirring the raw materials. In this type of indirect heating type agitating and drying machine, a rotary shaft is bridged between both ends of a casing having a supply port on one end side and a discharge port on the other end side, and a predetermined axial direction is provided on the outer peripheral surface of the rotary shaft. A plurality of fan-shaped stirring blades are attached at intervals of, and the rotating shaft and each stirring blade are formed hollow, or a hollow jacket is provided outside the casing, and a heat medium is passed through the hollow portions of these members, In many cases, the raw material continuously supplied from the supply port is dried by heating indirectly while stirring with each stirring blade, transferred to the other end of the casing, and discharged from the discharge port (for example, Patent Document 1). 2).

ところが、上記のような攪拌乾燥機では、特に供給口の下方において、原料の一部が攪拌羽根の外周面やケーシングの内面に固着してしまうことがある。これは、供給口から落下してきて短時間でも攪拌羽根の外周面上に留まって乾燥された原料や、攪拌羽根外周面とケーシング内面との間に挟まれて圧縮された原料が、水分の影響で固まりやすくなっているためと考えられる。また、各攪拌羽根にその両側面から回転軸の軸方向に張り出して原料を掻き上げる張出部を設けている場合は、この張出部が原料のケーシング内面への固着を助長することになる。このようにして攪拌羽根の外周面やケーシング内面に原料の固着層が形成されると、乾燥効率が低下するため、原料のケーシング内での滞留時間を長くすることが必要となり、処理コストの上昇を招く。
特公平４−７４０７９号公報 特開平９−１２２４０１号公報 However, in the above-described agitation dryer, a part of the raw material may adhere to the outer peripheral surface of the agitation blade or the inner surface of the casing, particularly under the supply port. This is because the raw material that has fallen from the supply port and stayed on the outer peripheral surface of the stirring blade for a short time and dried, or the raw material sandwiched between the outer peripheral surface of the stirring blade and the inner surface of the casing, is affected by moisture. This is thought to be due to the tendency to harden. Further, in the case where each stirring blade is provided with an overhanging portion that protrudes from both side surfaces in the axial direction of the rotation shaft to scoop up the raw material, the overhanging portion helps to fix the raw material to the inner surface of the casing. . If the fixed layer of the raw material is formed on the outer peripheral surface of the stirring blade or the inner surface of the casing in this way, the drying efficiency is lowered, so it is necessary to lengthen the residence time of the raw material in the casing, and the processing cost increases. Invite.
Japanese Examined Patent Publication No. 4-74079 JP-A-9-122401

この発明の課題は、扇形の攪拌羽根を回転軸に取り付けた形式の間接加熱型攪拌乾燥機の乾燥効率を向上させることである。   The subject of this invention is improving the drying efficiency of the indirect heating type stirring dryer of the type which attached the fan-shaped stirring blade to the rotating shaft.

上記の課題を解決するため、この発明は、一端側に供給口を、他端側に排出口を有するケーシングの両端間に回転軸を架け渡し、この回転軸の外周面に軸方向に所定の間隔で複数の扇形の攪拌羽根を取り付け、前記供給口から連続的に供給される被乾燥物を、前記各攪拌羽根で攪拌しながら伝導加熱により乾燥させる間接加熱型攪拌乾燥機において、前記供給口の下方に配される攪拌羽根の外周部を、外向きに尖った形状に形成した構成としたのである。   In order to solve the above-mentioned problem, the present invention extends a rotating shaft between both ends of a casing having a supply port on one end side and a discharge port on the other end side, and has a predetermined axial direction on the outer peripheral surface of the rotating shaft. In the indirect heating type agitation dryer, a plurality of fan-shaped stirring blades are attached at intervals, and the material to be dried continuously supplied from the supply port is dried by conduction heating while stirring with the stirring blades. The outer peripheral part of the stirring blade arranged below is formed in a shape that is pointed outward.

すなわち、供給口下方の攪拌羽根の外周部を外向きに尖った形状とすることにより、供給口から落下してきた原料が攪拌羽根の外周部に留まらないようにするとともに、攪拌羽根とケーシング内面との間で原料が圧縮されないようにして、攪拌羽根やケーシング内面への原料の固着を発生しにくくしたのである。   That is, by making the outer peripheral portion of the stirring blade below the supply port pointed outward, the raw material falling from the supply port is prevented from staying on the outer peripheral portion of the stirring blade, and the stirring blade and the casing inner surface Thus, the raw material is not compressed between them so that the raw material is less likely to stick to the stirring blade and the inner surface of the casing.

前記供給口の下方に配される攪拌羽根の回転方向の前端部を、回転方向に尖った形状に形成することにより、攪拌羽根の前端部の端面とケーシング内面との間での原料の圧縮が生じないようにして、原料の固着をより少なくすることができる。   By forming the front end portion in the rotation direction of the stirring blade disposed below the supply port in a shape that is sharp in the rotation direction, the raw material is compressed between the end surface of the front end portion of the stirring blade and the inner surface of the casing. It is possible to reduce the sticking of the raw material so as not to occur.

前記供給口の下方に配される攪拌羽根は、被乾燥物を前記ケーシングの他端側へ前進させる機能を有するものと後退させる機能を有するものとを、前記回転軸の軸方向に交互に取り付けるようにすれば、原料を供給口下方で往復移動させながら乾燥させて、供給口下方から外れた領域に移動したときに固着が生じない程度の乾燥状態とすることができる。   The stirring blades arranged below the supply port are alternately attached in the axial direction of the rotating shaft, those having the function of advancing the material to be dried to the other end side of the casing and those having the function of retreating. By doing so, the raw material can be dried while being reciprocated below the supply port, and can be brought into a dry state in which sticking does not occur when the raw material is moved to a region outside the supply port.

この発明は、上述したように、間接加熱型攪拌乾燥機の回転軸に取り付けた扇形の攪拌羽根のうち、供給口下方の攪拌羽根の外周部を外向きに尖った形状とすることにより、攪拌羽根やケーシング内面への原料の固着を発生しにくくしたので、乾燥機の乾燥効率を向上させることができる。その結果、原料のケーシング内での滞留時間を短縮して、処理コストの削減を図ることができる。   As described above, the present invention has a fan-shaped stirring blade attached to the rotating shaft of an indirect heating-type stirring / drying machine. Since the raw material is less likely to stick to the blades and the inner surface of the casing, the drying efficiency of the dryer can be improved. As a result, the residence time of the raw material in the casing can be shortened, and the processing cost can be reduced.

以下、図１乃至図４に基づき、この発明の実施形態を説明する。この間接加熱型攪拌乾燥機は、図１および図２に示すように、ケーシング１内に一対の攪拌手段２、３を有しており、ケーシング１外側には中空のジャケット４が取り付けられている。そして、ケーシング１一端側上部に設けた供給口１ａから連続的に供給される被乾燥物としての原料を、各攪拌手段２、３で攪拌しながら、各攪拌手段２、３およびジャケット４の内部に熱媒体を通すことにより間接的に加熱して乾燥させ、ケーシング１他端側の側部に設けた排出口１ｂからオーバーフローさせて排出するようになっている。なお、ケーシング１の他端側上部には、原料から蒸発した水蒸気等を排出する排気口１ｃが設けられている。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the indirect heating type agitation dryer has a pair of agitation means 2 and 3 in a casing 1, and a hollow jacket 4 is attached to the outside of the casing 1. . And while stirring the raw material as a to-be-dried substance continuously supplied from the supply port 1a provided at the upper end of the casing 1 with the stirring means 2, 3, the inside of each stirring means 2, 3 and the jacket 4 It is heated and dried indirectly by passing a heating medium through it, and overflowed and discharged from a discharge port 1b provided on the side of the other end of the casing 1. Note that an exhaust port 1c for discharging water vapor or the like evaporated from the raw material is provided in the upper part on the other end side of the casing 1.

前記各攪拌手段２、３は、図３にも示すように、それぞれケーシング１の両端間に架け渡した回転軸５に、扇形の攪拌羽根６、７を所定の間隔で軸心と直交する向きに取り付けたものである。各回転軸５は、両端部がケーシング１外に突出して回転自在に支持されており、一端部が駆動装置（図示省略）に、他端部がロータリジョイント８に連結されている。また、各回転軸５および攪拌羽根６、７は、中空に形成されており、水蒸気等の熱媒体がロータリジョイント８から各回転軸５内に導入されて攪拌羽根６、７に流入し、再び回転軸５内に戻ってロータリジョイント８から排出されるようになっている。   As shown in FIG. 3, each of the agitating means 2 and 3 has a fan-shaped agitating blades 6 and 7 in a direction perpendicular to the axis at predetermined intervals on a rotating shaft 5 spanned between both ends of the casing 1. It is attached to. Each rotating shaft 5 has both ends projecting out of the casing 1 and is rotatably supported. One end is connected to a driving device (not shown) and the other end is connected to a rotary joint 8. Moreover, each rotating shaft 5 and the stirring blades 6 and 7 are formed hollow, and a heat medium such as water vapor is introduced into each rotating shaft 5 from the rotary joint 8 and flows into the stirring blades 6 and 7. It returns to the inside of the rotating shaft 5 and is discharged from the rotary joint 8.

前記攪拌羽根６、７のうち、ケーシング１の供給口１ａの直下に配される攪拌羽根６は、図４（ａ）にも示すように、断面が三角形で外向きに尖った形状に形成されている。   Among the stirring blades 6 and 7, the stirring blade 6 disposed immediately below the supply port 1a of the casing 1 is formed in a triangular shape with a triangular cross section as shown in FIG. 4A. ing.

一方、供給口１ａ直下から外れた領域に配される攪拌羽根７は、図４（ｂ）にも示すように、断面が矩形で、供給口１ａ直下の攪拌羽根６よりも広い面積で原料と接触するようになっている。なお、各攪拌羽根７の回転方向の後端面には、回転軸５の軸方向および半径方向に張り出して、原料を掻き上げる張出部が設けられている。   On the other hand, as shown in FIG. 4 (b), the stirring blade 7 disposed in the region immediately below the supply port 1a has a rectangular cross section and has a wider area than the stirring blade 6 directly below the supply port 1a. It comes to contact. In addition, on the rear end face in the rotation direction of each stirring blade 7, an overhanging portion is provided that projects in the axial direction and the radial direction of the rotation shaft 5 to scoop up the raw material.

また、いずれのタイプの攪拌羽根６、７にも、回転方向の前端面がケーシング１他端側へ傾斜した送り羽根６ａ、７ａと、回転方向の前端面がケーシング１一端側へ傾斜した戻し羽根６ｂ、７ｂとがあり、両者が各回転軸５の周方向の相対する位置に軸方向に交互に配されている。そして、各回転軸５を内向きに回転させることにより、原料を互いに隣り合う送り羽根６ａ、７ａと戻し羽根６ｂ、７ｂとの間で往復移動させながら、回転軸５の周方向に循環させて攪拌するようになっている。   Further, in both types of stirring blades 6 and 7, feed blades 6 a and 7 a whose front end surface in the rotation direction is inclined toward the other end side of the casing 1 and return blades whose front end surface in the rotation direction is inclined toward one end side of the casing 1. 6b and 7b, both of which are alternately arranged in the axial direction at opposite positions in the circumferential direction of the respective rotating shafts 5. Then, by rotating each rotary shaft 5 inward, the raw material is circulated in the circumferential direction of the rotary shaft 5 while reciprocating between the feed blades 6a, 7a and the return blades 6b, 7b adjacent to each other. It is designed to stir.

次に、この攪拌乾燥機による乾燥処理の流れついて説明する。供給口１ａから供給された原料は、まず、供給口１ａの下方で左右の攪拌手段２、３の攪拌羽根６により攪拌される。このとき、各攪拌羽根６が外向きに尖った形状であるため、供給口１ａから落下してきた原料が攪拌羽根６の外周部に留まることはないし、攪拌羽根６外周部とケーシング１内面との間で原料が圧縮されることもない。また、各攪拌羽根６が回転方向にも尖った形状となっているため、その前端部の端面とケーシング１内面との間での原料の圧縮も生じにくい。従って、原料は、攪拌羽根６やケーシング１内面に固着することなく攪拌される。   Next, the flow of the drying process by the stirring dryer will be described. The raw material supplied from the supply port 1a is first stirred by the stirring blades 6 of the left and right stirring means 2 and 3 below the supply port 1a. At this time, since each stirring blade 6 has an outwardly sharp shape, the raw material dropped from the supply port 1a does not stay on the outer periphery of the stirring blade 6, and the outer periphery of the stirring blade 6 and the inner surface of the casing 1 The raw material is not compressed between. Moreover, since each stirring blade 6 has a sharp shape in the rotational direction, the compression of the raw material between the end surface of the front end portion and the inner surface of the casing 1 hardly occurs. Therefore, the raw material is stirred without being fixed to the stirring blade 6 or the inner surface of the casing 1.

供給口１ａの下方で攪拌される原料は、左右の攪拌手段２、３の送り羽根６ａと戻し羽根６ｂとの間で往復移動しながら上下方向に循環を繰り返すうちに、ジャケット４、回転軸５および攪拌羽根６を介して伝導される熱によりある程度まで乾燥される。そして、排出口１ｂ側の原料との位置頭差（ヘッド差）により少しずつ排出口１ｂ側へ移動する。   The raw material stirred below the supply port 1a is repeatedly circulated in the vertical direction while reciprocating between the feed blade 6a and the return blade 6b of the left and right stirring means 2 and 3, while the jacket 4 and the rotary shaft 5 are rotated. And it is dried to some extent by the heat conducted through the stirring blade 6. And it moves to the discharge port 1b side little by little by the position head difference (head difference) with the raw material on the discharge port 1b side.

供給口１ａ下方から排出口１ｂ側へ移動した原料は、供給口１ａ下方の原料と同様に、左右の攪拌手段２、３により攪拌されて、送り羽根７ａと戻し羽根７ｂとの間で往復移動しながら循環を繰り返すうちに乾燥されていく。このとき、原料は矩形断面の攪拌羽根７の外周面とケーシング１内面との間で圧縮されるが、既に供給口１ａ下方である程度乾燥されているため、攪拌羽根７外周面やケーシング１内面に固着することはない。そして、このように攪拌乾燥されながら徐々に排出口１ｂ側へ移動し、排出口１ｂからオーバーフローして排出される。   The raw material that has moved from the lower side of the supply port 1a to the discharge port 1b side is agitated by the left and right stirring means 2 and 3 and moved back and forth between the feed blade 7a and the return blade 7b in the same manner as the raw material below the supply port 1a. However, it is dried while repeating the circulation. At this time, the raw material is compressed between the outer peripheral surface of the stirring blade 7 having a rectangular cross section and the inner surface of the casing 1, but has already been dried to some extent below the supply port 1 a, so that the raw material is applied to the outer peripheral surface of the stirring blade 7 and the inner surface of the casing 1. It will not stick. Then, while being stirred and dried in this manner, it gradually moves toward the discharge port 1b, overflows from the discharge port 1b, and is discharged.

この攪拌乾燥機の乾燥処理では、上述のように、攪拌羽根６、７やケーシング１内面への原料の固着が発生しにくいため、従来よりも乾燥効率が高く、原料のケーシング１内での滞留時間を短縮することができる。   In the drying process of this agitation dryer, since the raw material is less likely to adhere to the agitating blades 6 and 7 and the inner surface of the casing 1 as described above, the drying efficiency is higher than before and the raw material stays in the casing 1. Time can be shortened.

なお、前述の特許文献１に記載の乾燥機は、実施形態の乾燥機と同様に断面三角形の攪拌羽根を備えている。しかし、その断面三角形の攪拌羽根は、ある程度小さい塊となった原料を剪断細分化するために供給口と排出口との中間領域に配されている点、および両側面に原料を掻き上げる張出部を有している点で実施形態の攪拌羽根と異なり、攪拌羽根やケーシングへの原料の固着を防止するものでないことは明らかである。   In addition, the dryer of the above-mentioned patent document 1 is equipped with the stirring blade of a cross-sectional triangle similarly to the dryer of embodiment. However, the stirring blades having a triangular cross section are arranged in the middle region between the supply port and the discharge port in order to shear and subdivide the raw material that has become a small lump to a certain extent, and overhangs that scrape the raw material on both sides. It is clear that, unlike the stirring blade of the embodiment, it does not prevent the raw material from sticking to the stirring blade or the casing in that it has a portion.

上述した実施形態では、ケーシング内に左右一対の攪拌手段を有する攪拌乾燥機について説明したが、攪拌手段を上下に設けた攪拌乾燥機の場合には、特に下側の攪拌手段に対して本発明を有効に適用することができる。   In the embodiment described above, the stirring dryer having the pair of left and right stirring means in the casing has been described. However, in the case of the stirring dryer provided with the stirring means up and down, the present invention is particularly applied to the lower stirring means. Can be applied effectively.

また、供給口下方の外向きに尖った形状の攪拌羽根の枚数や間隔は、種々の変更が可能である。   Moreover, various changes are possible for the number and interval of the stirring blades having an outwardly sharp shape below the supply port.

実施形態の攪拌乾燥機の縦断正面図Longitudinal front view of the agitation dryer of the embodiment 図１のＡ−Ａ線に沿った断面図Sectional drawing along the AA line of FIG. 図１の攪拌乾燥機の攪拌手段の平面図Plan view of the stirring means of the stirring dryer of FIG. ａは図１の攪拌乾燥機の供給口直下の攪拌羽根の斜視図および縦断正面図、 ｂはその他の領域の攪拌羽根の斜視図および縦断正面図a is a perspective view and a longitudinal front view of the stirring blades immediately below the supply port of the stirring dryer in FIG. 1, and b is a perspective view and a longitudinal front view of the stirring blades in other regions.

符号の説明Explanation of symbols

１ ケーシング
１ａ 供給口
１ｂ 排出口
１ｃ 排気口
２、３ 攪拌手段
４ ジャケット
５ 回転軸
６、７ 攪拌羽根
６ａ、７ａ 送り羽根
６ｂ、７ｂ 戻し羽根
８ ロータリジョイント DESCRIPTION OF SYMBOLS 1 Casing 1a Supply port 1b Discharge port 1c Exhaust port 2, 3 Stirring means 4 Jacket 5 Rotating shaft 6, 7 Stirring blade 6a, 7a Feed blade 6b, 7b Return blade 8 Rotary joint

Claims (1)

一端側に供給口（１ａ）を、他端側に排出口（１ｂ）を有するケーシング（１）の両端間に中空の回転軸（５）を架け渡し、この回転軸（５）の外周面に、軸方向に所定の間隔で、その軸方向から見て扇形で中空の攪拌羽根（６、７）を取り付け、前記供給口（１ａ）から連続的に供給される被乾燥物を、前記各攪拌羽根（６、７）で攪拌しながら、前記回転軸（５）および各攪拌羽根（６、７）内に送り込まれた熱媒体からの伝導加熱により乾燥させて前記排出口（１ｂ）に送り出す間接加熱型攪拌乾燥機において、前記供給口（１ａ）の下方以外の攪拌羽根（７）の外周部を、その全周にわたり前記軸方向の平面とするとともに、前記供給口（１ａ）の下方に配される攪拌羽根（６）の外周部を、その全周にわたり外向きに尖った形状に形成して、前記供給口（１ａ）の下方に配される攪拌羽根（６）とケーシング（１）内面との間で被乾燥物が圧縮されないようにしたことを特徴とする間接加熱型攪拌乾燥機。
A hollow rotary shaft (5) is bridged between both ends of a casing (1) having a supply port (1a) on one end side and a discharge port (1b) on the other end side. At the predetermined intervals in the axial direction, fan-shaped and hollow stirring blades (6, 7) are attached as viewed from the axial direction, and the materials to be dried continuously supplied from the supply port (1a) While stirring with the blades (6, 7), it is indirectly dried by conduction heating from the rotating shaft (5) and the heat medium sent into each stirring blade (6, 7) and sent to the discharge port (1b). In the heating type agitation dryer, the outer peripheral portion of the stirring blade (7) other than the lower side of the supply port (1a) is a flat surface in the axial direction over the entire periphery, and is arranged below the supply port (1a). the outer peripheral portion of the stirring blade (6) which is, in a shape pointed outwardly over its entire circumference Form, the indirect heating type stirring drying object to be dried between the casing (1) interior surface stirring blade (6) which is arranged downward, characterized in that to prevent the compression of the supply port (1a) Machine.
JP2004049767A 2004-02-25 2004-02-25 Indirect heating type agitating dryer Expired - Lifetime JP4004477B2 (en)

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JP6139949B2 (en) * 2013-04-05 2017-05-31 三菱重工環境・化学エンジニアリング株式会社 Indirect heating dryer
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CN103604280B (en) * 2013-12-05 2015-07-01 重庆市酉阳县酉好化肥有限公司 Anti-wall-adhering rotary-drum drying machine
CN105333706A (en) * 2015-12-04 2016-02-17 江苏碧诺环保科技有限公司 Drying machine
CN105333706B (en) * 2015-12-04 2018-06-01 江苏碧诺环保科技有限公司 A kind of drying machine

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