JP2599270B2 - Grain drying method - Google Patents

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、乾燥能力のある排熱風を外部に排出するこ
となく再度乾燥熱風として穀物乾燥に使用することで、
燃費の著しい節約と熱効率の向上を図つて省エネ化を容
易に達成させると同時に乾燥に関する。DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICABILITY The present invention relates to a method for drying dried cereals without discharging discharged hot air having a drying ability to the outside without discharging to outside.
The present invention relates to drying while at the same time achieving remarkable savings in fuel efficiency and improving thermal efficiency to easily achieve energy saving.

従来の技術 従来、乾燥に供された以降の排熱風であつても、該排
熱風に乾燥能力のある場合には、外部に排出することな
く、再度乾燥熱風として穀物乾燥に使用することで省エ
ネ化を容易に達成させると同時に乾燥性能の安定化を図
つた穀物乾燥機は数多く開発されており、その代表的な
ものとして特開昭61−195266号公報に記載されたものが
知られている。そこで、その内容を第４図及び第５図を
用いて説明する。すなわち、上部に貯留室１を、下部に
乾燥室２を設け、この乾燥室２前部にバーナ３を、後部
には排風機４を有し、バーナ３で発生する熱風を熱風室
５から乾燥室２を横断通風し、排風室６を経て排風機４
へ吸引排風させるべく設けると共に、排風機４とバーナ
３部とを連通させて風の一部を還元させる排風還元路室
７、及び乾燥機内を循環する循環穀粒の水分を検出する
水分センサー８を設け、該水分センサー８が検出する穀
粒の水分値に関連し、排風還元路室７を経てバーナ３部
へ還元する排風量を制御する制御装置９を設けて構成し
たものである。2. Description of the Related Art Conventionally, even in the case of exhausted hot air after drying, if the exhausted hot air has a drying ability, it is not exhausted to the outside, but is used again as dried hot air for grain drying to save energy. A number of grain dryers have been developed with the aim of stabilizing the drying performance while at the same time achieving easy liquefaction, and the representative ones described in JP-A-61-195266 are known. . Therefore, the contents will be described with reference to FIG. 4 and FIG. That is, a storage chamber 1 is provided at an upper part, and a drying chamber 2 is provided at a lower part. A burner 3 is provided at a front part of the drying chamber 2 and an exhaust fan 4 is provided at a rear part. The hot air generated by the burner 3 is dried from the hot air chamber 5. The air passes through the chamber 2, passes through the exhaust chamber 6,
The exhaust fan 4 and the burner 3 communicate with each other to reduce the part of the air, and the exhaust air return path chamber 7 and the moisture for detecting the moisture of the circulating kernel circulating in the dryer. A sensor 8 is provided, and a control device 9 is provided to control the amount of exhaust air returned to the burner 3 through the exhaust air return path chamber 7 in relation to the moisture value of the grain detected by the moisture sensor 8. is there.

発明が解決しようとする問題点 ところで、従前のこの種穀物乾燥機による乾燥方法に
おいては、乾燥穀物の水分がある特定の値になつたこと
を水分センサーで検知すると排熱風を還元利用するよう
にしたものであるから、外気条件にかかわらず排熱風を
還元利用しようとする為、例えば高温で、かつ多湿な外
気条件のもとでも乾燥穀物の水分がある特定の数値にな
れば自動的に排熱風を循環利用することになり、その結
果、乾燥能力が低下する許りでなく、穀温が上昇し穀物
の品質を劣化させる外、排熱風の量を規定できない問題
が生じた。Problems to be Solved by the Invention By the way, in the conventional drying method using the seed grain dryer, when the moisture sensor detects that the moisture of the dried grain has reached a specific value, the exhausted hot air is recycled. Therefore, in order to reduce and use the exhaust hot air regardless of the outside air condition, for example, even if the moisture of the dried grain reaches a certain value under high temperature and humid outside air condition, it is automatically exhausted. As a result, the hot air is circulated, and as a result, there is a problem that not only the drying ability is reduced, but also the grain temperature rises and the quality of the grain is deteriorated, and the amount of the exhausted hot air cannot be regulated.

問題点を解決するための手段 本発明は、前記問題点を解決するものであつて、以下
に本発明に係る穀物乾燥方法を実施例に対応する第１図
および第３図について説明する。Means for Solving the Problems The present invention solves the above-mentioned problems, and a grain drying method according to the present invention will be described below with reference to FIGS. 1 and 3 corresponding to an embodiment.

すなわち、本発明における穀物乾燥方法においては、
循環流動中の穀物の対し乾燥熱風を浴びせて乾燥し、こ
の穀物水分が略25％以下に乾燥されたとき、乾燥に供さ
れた以後の排熱風を乾燥熱風に混合して循環流動中の穀
物に対し再度浴びせる穀物乾燥方法において、前記排熱
風の循環供給を、外気の混合比が20gr/kg以下の外気条
件であって、かつ、その供給量を乾燥熱風の混合比が10
gr/kg〜20gr/kgの範囲に保持されるよう自動的に制御す
ることを特徴とするものである。That is, in the grain drying method of the present invention,
The cereal in the circulating flow is dried by immersing the cereal in the circulating flow with dry hot air and drying the cereal to a water content of about 25% or less. In the grain drying method to be re-bathed, the circulating supply of the exhausted hot air is performed under an outside air condition in which the mixing ratio of the outside air is 20 gr / kg or less, and the mixing amount of the hot air is adjusted to 10 by the mixing ratio of the drying hot air.
It is characterized in that it is automatically controlled so as to be maintained in the range of gr / kg to 20 gr / kg.

本発明方法を実施させるための具体的構成において
は、前後方向に長い乾燥機本体101の左右両側に熱風送
風室102と排塵風室103とを対称的に設ける。In a specific configuration for carrying out the method of the present invention, a hot air blowing chamber 102 and a dust blowing chamber 103 are provided symmetrically on both left and right sides of a dryer main body 101 that is long in the front-rear direction.

上記熱風送風室102と排塵風室103との間には横長方向
と直交する方向に向けて熱風送風室102に通ずる複数の
熱風室104……と排塵風室103に通ずる複数の排風室106
……とを両室104,106間に乾燥通路108が形成せられるよ
う交互に架設せしめる。前記乾燥機本体101の一側には
乾燥熱風を熱風送風室102内へ供給するバーナ装置125を
備えた送風室124と、排塵風室103内に排出された排熱風
を吸引して排塵筒128より排風せしめる吸引排風装置127
を収蔵した排熱風室126とを通風路129を介し接続せしめ
た筐体123を付設する。前記通風路129近傍位置の筐体12
3に開口した外気吸入窓130には、外気吸入窓130と通風
路129の開口面積を交互に増減調節できる開閉ダンパー1
32を設けて構成したものである。A plurality of hot air chambers 104 communicating with the hot air blowing chamber 102 in a direction perpendicular to the horizontal direction between the hot air blowing chamber 102 and the exhaust air chamber 103, and a plurality of exhaust air communicating with the exhaust air chamber 103 are provided. Room 106
Are alternately provided so that a drying passage 108 is formed between the two chambers 104 and 106. One side of the dryer main body 101 is provided with a blower chamber 124 having a burner device 125 for supplying dry hot air into the hot air blower chamber 102, and the exhaust hot air discharged into the dust exhaust chamber 103 is sucked to discharge dust. Suction exhaust device 127 that exhausts air from cylinder 128
A housing 123 is connected to the exhaust heat air chamber 126 that stores the air through the ventilation path 129. The housing 12 near the ventilation path 129
An opening / closing damper 1 that can adjust the opening area of the outside air suction window 130 and the ventilation passage 129 alternately is provided in the outside air suction window 130 opened to 3.
32 is provided.

作用 今、乾燥作業の開始に当り、所定量の高水分の穀物を
乾燥機本体101内部に充填収容せしめると共に該穀物を
乾燥機本体101内を循環流動せしめながらバーナ装置125
及び吸引排風装置127、その他の作動部材を運転せしめ
る。Now, at the start of the drying operation, a predetermined amount of high-moisture cereal is filled and stored inside the dryer main body 101, and the cereal is circulated through the dryer main body 101 while the burner device 125 is circulated.
Then, the suction and exhaust device 127 and other operating members are operated.

次いで、開閉ダンパー132を操作して外気吸入窓130を
開口すると同時に通風路129を閉鎖すれば、吸引排風装
置127の吸引圧送作用により、熱風送風室102、熱風室10
4、排風室106及び排塵風室103の内部は負圧状態とな
り、バーナ装置125により起成された乾燥熱風は、前記
負圧作用によつて、熱風室104、乾燥通路108、排風室10
6を流通した後、排塵風室103に入り、最後に排熱風室12
6より排塵筒128を経て機外に排風される一方流通作用を
営み、乾燥通路108中を順次流下する穀物を乾燥せしめ
る。Next, if the opening / closing damper 132 is operated to open the outside air suction window 130 and close the ventilation path 129 at the same time, the suction and discharge operation of the suction and discharge device 127 causes the hot air blowing chamber 102 and the hot air chamber 10 to cool.
4. The insides of the exhaust air chamber 106 and the exhaust air chamber 103 are in a negative pressure state, and the dry hot air generated by the burner device 125 is heated by the negative pressure action to generate the hot air chamber 104, the drying passage 108, and the exhaust air. Room 10
After passing through the exhaust gas chamber 6, the air enters the exhaust air chamber 103, and finally the exhaust air chamber 12
The air is exhausted to the outside of the machine through the dust discharge tube 128 from the sixth, while performing a circulation operation to dry the grains that sequentially flow down in the drying passage 108.

そして、上記作用により幾分乾燥された穀物は再び乾
燥機本体101内へ循環流動され再度前述と同様の乾燥作
用を受ける。Then, the cereal somewhat dried by the above operation is circulated again into the dryer main body 101 and again receives the same drying operation as described above.

ところで、上述の如き乾燥作業によつて、被乾燥穀物
の水分が略25％以下に乾燥されると共に外気の混合比が
20gr/kg以下であることが検知されると、開閉ダンパー1
32を操作して通風路129の開口面積を増大せしめると同
時に外気吸入窓130の開口面積を減少せしめて吸引排風
装置127によつて排塵筒128を介し機外へ排出していた排
熱風の一部を前記負圧作用によつて外気吸入窓130より
吸気された外気とともに送風室124内へ還元し、バーナ
装置125に供給して再度適正温度の官能熱風としながら
熱風送風室102に送り、前述と同様の乾燥作業を営ませ
る。By the above-mentioned drying operation, the water content of the cereal to be dried is dried to about 25% or less, and the mixing ratio of the outside air is reduced.
When it is detected that it is 20 gr / kg or less, the opening / closing damper 1
By operating the opening 32, the opening area of the ventilation path 129 is increased, and at the same time, the opening area of the outside air suction window 130 is reduced, and the exhausted hot air discharged to the outside of the apparatus through the exhaust cylinder 128 by the suction and exhaust device 127. A part of the air is returned to the blower chamber 124 together with the outside air sucked from the outside air suction window 130 by the negative pressure action, supplied to the burner device 125, and sent again to the hot air blower chamber 102 while producing functional hot air at an appropriate temperature. The same drying operation as described above is performed.

そして、一部の排熱風の使用によつて得られた乾燥熱
風の混合比は熱風送風室102内に配設された絶対湿度セ
ンサー131の検出作動で自動的に可動調節される開閉ダ
ンパー132の開閉動作で略10gr/kg〜20gr/kgの範囲に保
持できるよう排熱風の循環量を自動的に制御せしめなが
ら能率的に乾燥作業を継続し所定の乾燥穀物を得さしめ
る。The mixing ratio of the dry hot air obtained by using part of the exhaust hot air is determined by the absolute humidity sensor 131 disposed in the hot air blower chamber 102. The drying operation is efficiently continued while automatically controlling the circulating amount of the exhausted hot air so that the opening / closing operation can maintain the range of approximately 10 gr / kg to 20 gr / kg to obtain a predetermined dried grain.

したがつて、外気条件が高温、多湿で排熱風を循環利
用すべきでない場合には通風路129は開閉ダンパー130に
より閉鎖された排熱風を使用しないことになり、乾燥能
力の低下や品質劣化の恐れもなく能率的に乾燥作業を継
続せしめることができる許りか、排熱風を利用すべき条
件が乾燥熱風の混合比のみにて判断できる上、さらに利
用すべき排熱風の量も乾燥熱風の混合比を一定に制御す
ることで自動的に決定されるため制御が簡単にできる。Therefore, if the outside air condition is high temperature and high humidity and the exhaust hot air should not be circulated, the ventilation passage 129 does not use the exhaust hot air closed by the opening / closing damper 130, and the drying capacity decreases and the quality deteriorates. Whether it is possible to continue the drying work efficiently without fear, the conditions to use the exhaust hot air can be judged only by the mixing ratio of the dry hot air, and the amount of the exhaust hot air to be further used is mixed with the dry hot air Since the ratio is automatically determined by controlling the ratio, the control can be easily performed.

又、穀物乾燥の初期の如く、排熱風の混合比の高い時
には利用する排熱風の量も少く、乾燥が進行して排熱風
の混合比が低い値になるにつれて利用する排熱風の量も
自動的に増加するので、エネルギー効率も高くなるもの
である。Also, as in the early stage of grain drying, when the mixing ratio of the exhaust hot air is high, the amount of the exhaust hot air to be used is also small, and as the drying progresses and the mixing ratio of the exhaust hot air becomes a low value, the amount of the exhaust hot air to be used automatically increases. As a result, energy efficiency will also increase.

実施例 本発明に係る穀物乾燥方法を実施するための穀物乾燥
装置を添附図面に示した好適な一実施例について説明す
る。Embodiment A preferred embodiment of a grain drying apparatus for carrying out the grain drying method according to the present invention will be described with reference to the accompanying drawings.

図面において、101は、前後方向に長い横長角筒状の
乾燥機本体であつて、該乾燥機本体101内の左右両側
に、略相似形の熱風送風室102と排塵風室103とを対称的
に配設する。そして上記熱風送風室102と排塵風室103と
の間の空間上方位置には横長方向と直交する方向に向
け、一側が熱風送風室102と送風窓105を介し接続した先
止め状の複数からなる熱風室104と、一側が排塵風室103
と排風窓107を介し接続した先止め状の複数からなる排
風室106を、熱風室104と排風室106との間に乾燥通路108
が形成せられるよう交互に架設して、前記乾燥通路108
の上端側は、熱風室102および排風室106の上部に形成し
た調質槽109に接続せしめると共に、その下端側は熱風
室104および排風室106の直下に横長方向に沿い複数列に
亘り配設した山形仕切壁110により形成された複数の交
差流下繰出し室111に接続してある。In the drawing, reference numeral 101 denotes a dryer main body having a horizontally long rectangular tube shape that is long in the front-rear direction, and a hot air blow chamber 102 and a dust discharge chamber 103 having substantially similar shapes are symmetrically disposed on both left and right sides inside the dryer main body 101. It is arranged in a way. Then, at a position above the space between the hot air blowing chamber 102 and the dust exhausting chamber 103, in a direction orthogonal to the horizontal direction, one side is connected through the hot air blowing chamber 102 and the blowing window 105 from a plurality of front-stopped shapes. Hot air chamber 104 and one side is a dust air chamber 103
A plurality of exhaust chambers 106 each having a stop-like shape connected to each other through an exhaust window 107, and a drying passage 108 between the hot air chamber 104 and the exhaust chamber 106.
The drying passages 108 are alternately provided so that
The upper end is connected to a heat treatment tank 109 formed above the hot air chamber 102 and the exhaust air chamber 106, and the lower end thereof extends in a plurality of rows along the horizontal direction just below the hot air chamber 104 and the exhaust air chamber 106. It is connected to a plurality of cross-flow discharge chambers 111 formed by the arranged angled partition walls 110.

上記熱風室104及び排風室106は乾燥通路108に面する
側面を共に通風面112及び113に形成すると共に下部を開
放114及び115して、熱風室104の内部及び排風室106内部
を交差流下繰出し室111と接続せしめてある。したがつ
て、上記のような構成としたことにより、熱風室104、
排風室106及び乾燥通路108の長さが短かく形成できると
同時にその数を多くして、調質槽109内に充填された穀
物の堆積圧が大きくとも、熱風室104及び排風室106が彎
曲することなく、その耐久性を大きくできる許りか、送
風窓105及び排風窓107の数も増加させて熱風送風室102
より送風される熱風の送風抵抗を減少させ、熱風送風室
102よりの送風量を多くできる。The hot air chamber 104 and the exhaust air chamber 106 have both sides facing the drying passage 108 as ventilation surfaces 112 and 113, and the lower portions are opened 114 and 115, so that the inside of the hot air chamber 104 and the inside of the exhaust air chamber 106 intersect. It is connected to the downflow delivery chamber 111. Therefore, with the above configuration, the hot air chamber 104,
The length of the exhaust air chamber 106 and the drying passage 108 can be shortened, and at the same time, the number thereof is increased, so that the hot air chamber 104 and the exhaust air chamber 106 If it is possible to increase the durability without bending, the number of the blow window 105 and the exhaust window 107 may be increased to increase the hot air blow chamber 102.
Reduces the resistance of the hot air blown by the hot air blower,
Can increase the air flow from 102.

又、熱風室104及び排風室106の下部を開放114及び115
したことで、乾燥通路108を流下する穀物中に混入した
塵埃等の一部が通風面112及び113より熱風室104及び排
風室106内に進入しても、該塵埃等が熱風室104及び排風
室106内底部に堆積されることなく、総て円滑に下部の
交差流下繰出し室111へ流下させ、堆積塵埃等の引火燃
焼により穀物乾燥機の火災事故を防止できる。Also, the lower portions of the hot air chamber 104 and the exhaust air chamber 106 are opened 114 and 115
By doing so, even if some of the dust mixed in the grains flowing down the drying passage 108 enters the hot air chamber 104 and the exhaust chamber 106 from the ventilation surfaces 112 and 113, the dust and the like may All of them are allowed to flow smoothly to the lower cross-flow discharge chamber 111 without being accumulated at the bottom of the exhaust chamber 106, and the fire of the grain dryer can be prevented by igniting and burning the accumulated dust and the like.

その上、さらに熱風室104及び排風室106の直下に複数
の山形仕切壁110により複数の交差流下繰出し室111が形
成されているため、乾燥通路108において前後方向に分
けられた穀物の流れを乾燥通路108を通過したあと、今
度は左右方向に流れを変向して交差流下し、初期含水分
値の異なる穀物を効率よく攪拌混合せしめると同時に穀
物の流動性を向上させて、穀物の乾燥ムラ及び流下ムラ
を無くして、均一に乾燥させることができる。In addition, since a plurality of cross-flow discharge chambers 111 are formed by a plurality of mountain-shaped partition walls 110 immediately below the hot air chamber 104 and the exhaust air chamber 106, the flow of the grains divided in the front-rear direction in the drying passage 108 is reduced. After passing through the drying passage 108, this time, the flow is deflected to the left and right, cross-flows down, and efficiently mixes and mixes grains with different initial moisture contents, while improving the fluidity of the grains and drying the grains. Unevenness and flowing-down unevenness can be eliminated, and uniform drying can be achieved.

なお、上記交差流下繰出し室111内には、乾燥通路108
を経て流下した穀物が常に充満しているので、熱風や排
塵風の漏出を未然に防止できる。山形仕切壁110の各谷
部には横長方向に沿つて繰出し口116が開口されてお
り、この繰出し口116位置には間欠回転される繰出しロ
ール117が回転自在に軸架されている。交差流下繰出し
室111の下部には、周囲を熱風送風室102、排塵風室10
3、繰出し室111及び乾燥機本体101の前後壁板101a,101b
により囲まれた取出し室118を配設すると共に、熱風送
風室102と排塵風室103の下部間隔中には搬出樋119を横
長方向に沿つて設けて、これが搬出樋119を取出し室118
と接続せしめる。上記搬出樋119の内部には搬出スクリ
ユー120が回転自在に横架されており、搬出樋119の一端
は乾燥機本体101の一側に立設した循環用昇降機121の下
部に接続せしめると共に循環用昇降機121の上部は乾燥
機本体101の頂部に横長方向に沿い横設した搬入樋122の
供給始端側へ接続せしめる。前記乾燥機本体101の一側
例えば前面側には、乾燥熱風を熱風送風室102内へ供給
するバーナ装置125の吸気側を開口接続せしめた送風室1
24と、排塵風室103内に排出された排風を吸引して排塵
筒128より排風せしめる吸引排風装置127を回転自在に収
蔵した排熱風室126とを通風路129を介し接続せしめた筐
体123が付設されており、しかも前記通風路129近傍位置
の筐体123の上面には外気吸入窓130が開口されている。
そして前記外気吸入窓130は、熱風送風室102内に配設さ
れた絶対湿度センサ131と接続された開閉ダンパー132に
より開閉口されるように構成されている。The drying passage 108 is provided in the cross-flow discharge chamber 111.
Since the grains that have flowed down through are always full, it is possible to prevent the leakage of hot air and dust wind. A feed port 116 is opened in each valley of the mountain-shaped partition wall 110 along the horizontal direction, and a feed roll 117 that is intermittently rotated is rotatably mounted at the position of the feed port 116. In the lower part of the cross-flow discharge chamber 111, the surroundings are a hot air blowing chamber 102,
3, the feeding chamber 111 and the front and rear wall plates 101a, 101b of the dryer main body 101
And a discharge gutter 119 is provided along the horizontal direction in the lower space between the hot air blower chamber 102 and the dust discharge chamber 103, and the discharge gutter 119 is taken out of the discharge chamber 118.
And connect. An unloading screw 120 is rotatably mounted horizontally inside the unloading gutter 119, and one end of the unloading gutter 119 is connected to a lower part of a circulating elevator 121 erected on one side of the dryer body 101 and used for circulation. The upper part of the elevator 121 is connected to the supply start end side of the carry-in gutter 122 provided along the horizontal direction on the top of the dryer main body 101. On one side, for example, the front side of the dryer main body 101, a blower chamber 1 in which an intake side of a burner device 125 that supplies dry hot air into the hot air blower chamber 102 is connected to be opened.
24 is connected through a ventilation path 129 to a heat exhaust air chamber 126 that rotatably stores a suction air exhaust device 127 that sucks the exhaust air exhausted into the exhaust air chamber 103 and exhausts the exhaust air from an exhaust cylinder 128. A shrunken case 123 is attached, and an outside air suction window 130 is opened on the upper surface of the case 123 near the ventilation path 129.
The outside air intake window 130 is configured to be opened / closed by an opening / closing damper 132 connected to an absolute humidity sensor 131 provided in the hot air blowing chamber 102.

したがつて、穀物水分が略25％以上及び外気の混合比
が20gr/kg以上の時には開閉ダンパー132による通風路12
9を全閉して、排熱風の総てを吸引排風装置127により排
塵筒128を経て外部に排出して排熱風の使用を断つと共
に乾燥作業によって穀物水分が25％以下となり、かつ、
外気の混合比が20gr/kg以下のときには、絶対湿度セン
サー131の検出信号に基づき開閉ダンパー132を通風路12
9の開口面積が大きくなるように回動して、外気と排熱
風の一部との混合空気をバーナ装置125に供給して乾燥
熱風の混合比が略10gr/kg〜20gr/kgの範囲に保持される
よう排熱風の循環量を自動的に制御せしめる。Therefore, when the grain moisture is approximately 25% or more and the mixture ratio of the outside air is 20 gr / kg or more, the ventilation passage 12 by the opening / closing damper 132 is used.
9 is fully closed, all of the exhausted hot air is exhausted to the outside through the exhaust cylinder 128 by the suction exhaust device 127, the use of the exhausted hot air is cut off, and the grain moisture is reduced to 25% or less by the drying operation, and
When the mixture ratio of the outside air is 20 gr / kg or less, the opening / closing damper 132 passes through the ventilation path 12 based on the detection signal of the absolute humidity sensor 131.
9 is rotated so as to increase the opening area, and the mixed air of the outside air and a part of the exhaust hot air is supplied to the burner device 125 so that the mixing ratio of the dry hot air is in a range of approximately 10 gr / kg to 20 gr / kg. Automatically controls the amount of hot air circulated so that it is maintained.

なお、混合比とは、単位体積中の水蒸気の質量と乾燥
空気の質量の比をいうものである。The mixing ratio refers to the ratio of the mass of water vapor to the mass of dry air in a unit volume.

発明の効果 本発明の穀物乾燥方法においては、とくに、排熱風の
再利用を外気の混合比が20gr/kg以下となっている外気
条件の場合のみ利用し、この混合比以上のときには排熱
風を再利用しないことにある。Effect of the Invention In the grain drying method of the present invention, in particular, the reuse of exhaust hot air is used only under the external air condition where the mixing ratio of the external air is 20 gr / kg or less, and when the mixing ratio is higher than this, the exhaust hot air is The point is not to reuse.

このように排熱風の再利用の可否を外気条件で制御す
ることにより、例えば、外気の混合比が20gr/kg以上と
なる高温多湿の外気条件下で排熱風を混合した乾燥熱風
を使用した場合に生じやすい穀物乾燥能力の低下や穀温
の上昇による品質劣化を未然に防止して、外気条件に左
右されずに一定の乾燥能力と安定した品質を得ることが
できる。By controlling the reusability of the exhaust hot air under the outside air condition in this way, for example, when dry hot air mixed with the exhaust hot air is used under a high temperature and high humidity outside air condition in which the mixing ratio of the outside air is 20gr / kg or more. Thus, it is possible to prevent the deterioration of the grain drying ability and the deterioration of the quality due to the rise of the grain temperature, which are likely to occur in advance, and to obtain a constant drying ability and stable quality irrespective of the outside air condition.

さらに、排熱風の循環供給おいて、その供給量を乾燥
熱風の混合比が10gr/kg〜20gr/kgの範囲に保持されるよ
うに設定することにより、供給量が自動的に決定され、
操作および管理が非常に容易に行うことができる。Furthermore, in the circulating supply of the exhaust hot air, the supply amount is automatically determined by setting the supply amount so that the mixing ratio of the dry hot air is maintained in a range of 10 gr / kg to 20 gr / kg.
Operation and management can be performed very easily.

また、乾燥段階において、乾燥初期における排熱風の
混合比が高い値のときには再利用する排熱風の量が少な
く、乾燥が進行して排熱風における混合比の値が低くな
るにつれて段階的に利用する排熱風の量が自動的に増加
するため乾燥に必要なエネルギー効率を高めることがで
きる。Further, in the drying stage, when the mixing ratio of the exhaust hot air in the initial stage of the drying is a high value, the amount of the exhaust hot air to be reused is small, and the amount is gradually used as the drying proceeds and the value of the mixing ratio in the exhaust hot air decreases. Since the amount of exhaust hot air automatically increases, the energy efficiency required for drying can be increased.

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

図面は本発明方法を実施させるための装置の一実施例を
示すものであつて、第１図は縦断正面図、第２図は要部
を破断した側面図、第３図は一部を切欠し、かつ要部を
破断した筐体の正面図、第４図は一部を破断した従来装
置の側面図、第５図は第４図Ａ−Ａ線矢視方向の縦断正
面図である。 101……乾燥機本体、102……熱風送風室、103……排塵
風室、104……熱風室、106……排風室、108……乾燥通
路、123……筐体、124……送風室、125……バーナ装
置、126……排熱風室、127……吸引排風装置、128……
排塵筒、129……通風路The drawings show an embodiment of an apparatus for carrying out the method of the present invention, wherein FIG. 1 is a longitudinal sectional front view, FIG. 2 is a side view in which main parts are cut away, and FIG. FIG. 4 is a side view of the conventional apparatus with a part thereof cut away, and FIG. 5 is a vertical sectional front view taken along line AA of FIG. 101: dryer body, 102: hot air blowing chamber, 103: exhaust air chamber, 104: hot air chamber, 106: exhaust air chamber, 108: drying passage, 123 ... housing, 124 ... Blower chamber, 125 Burner device, 126 Exhaust air chamber, 127 Suction exhaust device, 128
Dust cylinder, 129 ... Ventilation path

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】循環流動中の穀物の対し乾燥熱風を浴びせ
て乾燥し、この穀物水分が略25％以下に乾燥されたと
き、乾燥に供された以後の排熱風を乾燥熱風に混合して
循環流動中の穀物に対し再度浴びせる穀物乾燥方法にお
いて、前記排熱風の循環供給を、外気の混合比が20gr/k
g以下の外気条件であって、かつ、その供給量を乾燥熱
風の混合比が10gr/kg〜20gr/kgの範囲に保持されるよう
自動的に制御することを特徴とする穀物乾燥方法。1. A circulating grain is dried by being exposed to dry hot air, and when the moisture of the grain is reduced to about 25% or less, the exhausted hot air after drying is mixed with the dry hot air. In the grain drying method in which the grains in the circulating flow are bathed again, the circulating supply of the exhaust hot air is performed at a mixing ratio of outside air of 20 gr / k.
A cereal drying method, characterized in that the cereal drying method is performed under an outside air condition of not more than g and automatically controlling a supply amount thereof so that a mixing ratio of the dry hot air is maintained in a range of 10 gr / kg to 20 gr / kg.