JPH02183790A - Drying control method in grain dryer - Google Patents
Drying control method in grain dryerInfo
- Publication number
- JPH02183790A JPH02183790A JP33344988A JP33344988A JPH02183790A JP H02183790 A JPH02183790 A JP H02183790A JP 33344988 A JP33344988 A JP 33344988A JP 33344988 A JP33344988 A JP 33344988A JP H02183790 A JPH02183790 A JP H02183790A
- Authority
- JP
- Japan
- Prior art keywords
- drying
- grain
- hot air
- target
- moisture
- 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
Links
- 238000001035 drying Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 238000010981 drying operation Methods 0.000 abstract description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、乾燥槽に張り込まれた穀物を連続流下させな
がら通風乾燥する穀物乾燥機における乾［従来の技術］
従来、乾燥槽に張り込まれた穀物を連続流下させながら
通風乾燥する穀物乾燥機、いわゆる連続流下乾燥機は、
ここに例示するまでもなく、乾燥施設等において用いら
れており、既に公知である。Detailed Description of the Invention [Industrial Field of Application] The present invention relates to drying in a grain dryer in which grains placed in a drying tank are ventilated while continuously flowing down. A grain dryer, which dries loaded grains with ventilation while continuously flowing down, is a so-called continuous flow dryer.
There is no need to exemplify it here, but it is used in drying facilities and the like, and is already well known.
［発明が解決しようとする課題］
ところで、この種の連続流下乾燥機は、乾燥槽内で穀物
を連続して流下させながら、熱風によって通風乾燥する
ものであるが、乾燥に要する時間は、通常１０〜１６時
間を要している。[Problems to be Solved by the Invention] This type of continuous flow dryer uses hot air to dry grains while continuously flowing them down in a drying tank, but the time required for drying is usually It takes 10 to 16 hours.
このため、乾燥中に外気温度や湿度が大幅に変化するこ
とがあり、熱風の乾燥能力も変化するので、乾燥作業の
開始時に熱風の温度を適正に設定しても、乾燥作業中に
熱風温度の調整を行わなければならず、従来はオペレー
タが乾燥槽に張り込まれる前の穀物の水分と、乾燥槽か
ら搬出された穀物の水分を測定し、その測定結果に基づ
いて経験と勘に頼って手動で！ｌｌ整を行っており、穀
物を安定して良好に乾燥するうえで問題があった。For this reason, the outside air temperature and humidity may change significantly during drying, and the drying capacity of the hot air will also change. Conventionally, an operator would measure the moisture content of the grain before it is loaded into the drying tank and the moisture content of the grain taken out from the drying tank, and then rely on experience and intuition based on the measurement results. Manually! There was a problem in drying the grain stably and well.
本発明は、上記問題点に鑑み、乾燥槽に張り込まれる前
の穀物の水分と乾燥槽から送出される穀物の水分を所定
間隔て酒定してその差で実績乾減率を算出し、乾燥風の
熱風温度、外気温度、外気の湿球温度および上記実績乾
減率から乾燥機の乾燥能力を算出し、穀物の乾燥目標水
分と乾燥槽に張り込まれる前の穀物の水分との差から目
標乾減率を算出し、上記乾燥機の乾燥能力と目標乾減率
とで乾燥風の熱風温度を制御することにより、乾燥作業
の開始時に乾燥目標水分を設定するのみで、乾燥作業中
にたとえ天候の急変等があって外気温度や湿度が大幅に
変化しても、乾燥状態を自動的に適正に保持させ、もっ
て、穀物の乾燥を均質にかつ良好に行うことができる穀
物乾燥機における乾燥制御方法を提供することを目的と
するものである。In view of the above-mentioned problems, the present invention determines the moisture content of the grain before it is loaded into the drying tank and the moisture content of the grain sent out from the drying tank at predetermined intervals, calculates the actual drying loss rate from the difference, Calculate the drying capacity of the dryer from the hot air temperature of the drying air, the outside air temperature, the wet bulb temperature of the outside air, and the actual drying loss rate above, and calculate the difference between the drying target moisture content of the grain and the moisture content of the grain before it is loaded into the drying tank. By calculating the target drying ratio from A grain dryer that automatically maintains the proper drying state even if the outside temperature or humidity changes significantly due to sudden changes in the weather, thereby drying grain uniformly and well. The purpose of the present invention is to provide a drying control method in the present invention.
［課題を解決するための手段］
上記目的を達成するため、本発明は、乾燥槽に張り込ま
れた穀物を連続流下させながら通風乾燥する穀物乾燥機
において、乾燥槽に張り込まれる前の穀物の水分と乾燥
槽から送出される穀物の水分を所定間隔で測定してその
差で実績乾減率を算出し、乾燥風の熱風温度、外気温度
、外気の湿球温度および上記実績乾減率から乾燥機の乾
燥能力を算出し、穀物の乾燥目標水分と乾燥槽に張り込
まれる前の穀物の水分との差から目標乾減率を算出し、
上記乾燥機の乾燥能力と目標乾減率とで乾燥風の熱風温
度を制御することを特徴とする穀物乾燥機における乾燥
制御方法としたものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a grain dryer in which grains piled in a drying tank are dried by ventilation while continuously flowing down. The actual drying rate is calculated by measuring the moisture content of the grains and the moisture content of the grain sent out from the drying tank at predetermined intervals and calculating the actual drying rate based on the difference between the two. Calculate the drying capacity of the dryer from
This is a drying control method for a grain dryer, characterized in that the hot air temperature of the drying air is controlled based on the drying capacity of the dryer and the target drying loss rate.
［作 用 ］
本発明に係る方法によれば、前記のように、乾燥槽に張
り込まれる前の穀物の水分と乾燥槽から送出される穀物
の水分が所定間隔で測定され、その差で実績乾減率が算
出される。一方、乾燥風の熱風温度、外気温度、外気の
湿球温度が乾燥作業中に測定され、上記実績乾減率から
乾燥機の乾燥能力が算出され、穀物の乾燥目標水分と乾
燥槽に張り込まれる前の穀物の水分との差から目標乾減
率が算出され、上記乾燥機の乾燥能力と目標乾減率とで
乾燥風の熱風温度が制御されるので、乾燥作業中に外気
温度や湿度がいかに変化しても、適正な乾燥状態が維持
され、穀物は均質かつ良好に自動乾燥される。[Function] According to the method according to the present invention, as described above, the moisture content of the grain before it is loaded into the drying tank and the moisture content of the grain sent out from the drying tank are measured at predetermined intervals, and the difference between the moisture content and the moisture content of the grain sent out from the drying tank is measured. The drying rate is calculated. On the other hand, the hot air temperature of the drying air, the outside air temperature, and the wet bulb temperature of the outside air are measured during the drying operation, and the drying capacity of the dryer is calculated from the actual drying loss rate mentioned above. The target drying loss rate is calculated from the difference between the moisture content of the grain before drying, and the hot air temperature of the drying air is controlled by the drying capacity of the dryer and the target drying rate. No matter how much the drying conditions change, the proper drying conditions are maintained and the grain is automatically dried homogeneously and well.
［実 施 例 ］ 実施例につき図面を参照して説明する。[Example ] Examples will be described with reference to the drawings.
図面には本発明に係る方法を実施するための装置の構成
が例示されており、ｌは乾燥能力計算ブロック、２は飽
和水蒸気圧計算ブロック、３は熱風温度計算ブロックで
ある。４は乾燥槽に張り込まれる前の穀物の水分を検出
する入口水分センサ、５は乾燥槽から送出された穀物の
水分を検出する出口水分センサ、６は乾燥風の熱風温度
センサ、７は外気温度センサ、８は湿球温度センサ、９
は乾燥槽に張り込まれる前の穀物の温度を検出する人口
穀温センサ、！０は穀物の乾燥目標水分を設定する目標
水分設定器が備えられている。The drawing exemplifies the configuration of an apparatus for carrying out the method according to the present invention, where l is a drying capacity calculation block, 2 is a saturated water vapor pressure calculation block, and 3 is a hot air temperature calculation block. 4 is an inlet moisture sensor that detects the moisture content of the grain before it is loaded into the drying tank, 5 is an outlet moisture sensor that detects the moisture content of the grain sent out from the drying tank, 6 is a hot air temperature sensor for drying air, and 7 is the outside air Temperature sensor, 8 is wet bulb temperature sensor, 9
is an artificial grain temperature sensor that detects the temperature of grain before it is placed in the drying tank! 0 is equipped with a target moisture setting device for setting the drying target moisture of grain.
上記乾燥能力計算ブロックｌは、平均計算回路１１．１
１’、乾燥槽において穀物が３０分間通風されることに
応じた３０分遅延回路１２、乾燥実績計算回路１３、熱
風飽和水蒸気圧計算回路１４、および乾燥能力計算回路
１５を備えて構成されており、人口水分センサ４、出口
水分センサ５、人口穀温センサ９が図示のように接続さ
れている。また、飽和水蒸気圧計算ブロック２は、飽和
水蒸気圧計算回路１６によって構成され、外気温度セン
サ７、湿球温度センサ８は図示のように接続されている
。さらに、熱風温度計算ブロック３は、目標乾減率計算
回路１７および熱風温度設定計算回路１８によって構成
されており、目標水分設定器１０および平均計算回路１
１は目標乾減率計算回路１７に接続され、人口穀温セン
サ９は熱風温度設定回路１８に接続されている。１９は
熱風発生装置であり、例えば灯油バーナと送風機を組み
合わせたものであって、熱風温度計算回路１８の出力に
応じた温度の熱風を発生するものである。The drying capacity calculation block l is the average calculation circuit 11.1
1', a 30-minute delay circuit 12 according to the fact that the grain is ventilated for 30 minutes in the drying tank, a drying performance calculation circuit 13, a hot air saturated water vapor pressure calculation circuit 14, and a drying capacity calculation circuit 15. , an artificial moisture sensor 4, an outlet moisture sensor 5, and an artificial grain temperature sensor 9 are connected as shown. Further, the saturated water vapor pressure calculation block 2 is constituted by a saturated water vapor pressure calculation circuit 16, and an outside air temperature sensor 7 and a wet bulb temperature sensor 8 are connected as shown. Further, the hot air temperature calculation block 3 includes a target drying rate calculation circuit 17 and a hot air temperature setting calculation circuit 18, and includes a target moisture setting device 10 and an average calculation circuit 1.
1 is connected to a target drying rate calculation circuit 17, and the artificial grain temperature sensor 9 is connected to a hot air temperature setting circuit 18. A hot air generator 19 is a combination of a kerosene burner and a blower, for example, and generates hot air at a temperature corresponding to the output of the hot air temperature calculation circuit 18.
以上のように構成された装置において、乾燥槽に張り込
まれる穀物の水分は人口水分センサ４で検出され、乾燥
槽から送出される穀物の水分は出口水分センサ５によっ
て検出される。また、乾燥風の熱風温度は熱風温度セン
サ６で検出され、外気温度および湿球温度はそれぞれ外
気温度センサ７および湿球温度センサ９で検出され、さ
らに張り込まれる前の穀物の穀温は穀温センサ９で検出
される。In the apparatus configured as described above, the moisture content of the grains loaded into the drying tank is detected by the artificial moisture sensor 4, and the moisture content of the grains sent out from the drying tank is detected by the outlet moisture sensor 5. Further, the hot air temperature of the drying air is detected by a hot air temperature sensor 6, the outside air temperature and the wet bulb temperature are detected by an outside air temperature sensor 7 and a wet bulb temperature sensor 9, respectively, and the grain temperature of the grain before it is pasted is determined by the grain temperature. It is detected by the temperature sensor 9.
穀物の乾燥にあたっては、穀物の乾燥仕上がり水分を目
標水分設定器ｌＯで例えは１６パーセントと設定し、乾
燥を開始する。人口水分および出口水分は、例えば５分
毎に検出され、３回検出毎に平均値が平均計算回路ＩＬ
ＩＩ’から出力し、３０分遅延回路１２を経て３０分後
に出力する。そして、乾燥実績計算回路１３において現
在の出口水分と比較され、その差の実績乾減率が乾燥機
能力計算回路１５に人力し、さらに乾燥機能力計算回路
１５ては、熱風飽和蒸気圧計算回路１４の出力、および
人口穀温センサ９で検出された穀温によってその時点で
の乾燥機能力が計算される。上記水分差は、外気温度お
よび湿球温度から熱風発生装置１９に入る空気の飽和蒸
気圧が熱風により加熱されて、穀物に３０分間通風され
たことによって生じたものである。When drying the grain, the drying finish moisture of the grain is set to, for example, 16% using the target moisture setting device IO, and drying is started. The artificial moisture and outlet moisture are detected every 5 minutes, for example, and the average value is calculated every 3 times by the average calculation circuit IL.
The signal is output from II', passes through the 30-minute delay circuit 12, and is output after 30 minutes. Then, it is compared with the current outlet moisture content in the drying performance calculation circuit 13, and the actual drying loss rate of the difference is manually inputted to the drying performance calculation circuit 15, which further inputs the hot air saturated vapor pressure calculation circuit. 14 and the grain temperature detected by the artificial grain temperature sensor 9, the drying function at that time is calculated. The moisture difference is caused by the saturated vapor pressure of the air entering the hot air generator 19 from the outside air temperature and the wet bulb temperature being heated by the hot air, which is then passed through the grain for 30 minutes.
一方、目標水分と平均人口水分との差、すなわち目標乾
減率が目標乾減率計算回路１７て計算され、熱風温度設
定計算回路１８に人力し、既に計算されている飽和水蒸
気圧、人口穀温および乾燥能力が人力し、熱風温度設定
計算回路１８ではそれらの条件によって適切な設定温度
が算出され、設定温度によって熱風発生装置１９におい
て熱風が送風されろ。On the other hand, the difference between the target moisture content and the average population moisture content, that is, the target drying rate, is calculated by the target drying rate calculation circuit 17, and is manually inputted to the hot air temperature setting calculation circuit 18. The temperature and drying capacity are controlled manually, the hot air temperature setting calculation circuit 18 calculates an appropriate set temperature based on these conditions, and the hot air generator 19 blows hot air according to the set temperature.
ところで、前記のように算出される乾燥機能力は、例え
ば、１パーセントの水分を除くのに必要な熱量であって
、外気の飽和蒸気圧の影響を受けない定数として記憶さ
れている。この乾燥能力は、上記の熱風温度計算回路１
８で次の入口水分に適応した設定温度を計算するために
フィードバックされる。設定温度は、人口水分て示され
る穀物を出口水分で目標水分となるように、フィードフ
ォワードされる。このため、連続流下によって通風乾燥
される入口水分、飽和水蒸気圧等に変動が生しても、出
口水分は、目標水分となるように自動的に乾燥制御され
る。By the way, the drying function calculated as described above is, for example, the amount of heat required to remove 1% of moisture, and is stored as a constant that is not affected by the saturated vapor pressure of outside air. This drying capacity is determined by the hot air temperature calculation circuit 1 above.
8 is fed back to calculate the set temperature appropriate for the next inlet moisture. The set temperature is fed forward so that the grain, indicated by the artificial moisture content, reaches the target moisture content at the outlet. Therefore, even if there are fluctuations in the inlet moisture, saturated water vapor pressure, etc. that are ventilated and dried by continuous flow, the outlet moisture is automatically controlled to dry so that it reaches the target moisture.
［発明の効果コ
本発明は、前記のように、乾燥槽に張り込まれた穀物を
連続流下させながら通風乾燥する穀物乾燥機において、
乾燥槽に張り込まれる前の穀物の水分と乾燥槽から送出
される穀物の水分を所定間隔で測定してその差で実績乾
減率を算出し、乾燥風の熱風温度、外気温度、外気の湿
球温度および上記実績乾減率から乾燥機の乾燥能力を算
出し、穀物の乾燥目標水分と乾燥槽に張り込まれる前の
穀物の水分との差から目標乾減率を算出し、上記乾燥機
の乾燥能力と目標乾減率とで乾燥風の熱風温度を制御す
る穀物乾燥機における乾燥制御方法であるから、次の効
果を奏する。[Effects of the Invention] As described above, the present invention provides a grain dryer in which grains placed in a drying tank are ventilated and dried while continuously flowing down.
The moisture content of the grain before it is loaded into the drying tank and the moisture content of the grain sent out from the drying tank are measured at predetermined intervals, and the difference between the two is used to calculate the actual drying loss rate. The drying capacity of the dryer is calculated from the wet bulb temperature and the actual drying loss rate mentioned above, and the target drying rate is calculated from the difference between the drying target moisture content of the grain and the moisture content of the grain before it is loaded into the drying tank. This drying control method in a grain dryer controls the hot air temperature of the drying air based on the drying capacity of the machine and the target drying loss rate, so it has the following effects.
すなわち、乾燥作業の開始時に乾燥目標水分を設定する
のみて、乾燥作業中にたとえ天候の急変等があって外気
温度や湿度が大幅に変化しても、乾燥状態を自動的に適
正に保持させ、穀物の乾燥を均質にかつ良好に行うこと
ができる効果が得られる。In other words, by simply setting the drying target moisture at the start of drying work, the drying state can be automatically maintained at an appropriate level even if the outside temperature and humidity change significantly during the drying work due to sudden changes in the weather. , the effect of drying grains uniformly and satisfactorily is obtained.
図面は本発明に係る方法を実施するための装置の一例を
示すブロック図である。
１・・・乾燥能力計算ブロック、２・・・飽和水蒸気圧
計算ブロック、３・・・熱風温度計算ブロック、４・・
・人口水分センサ、５・・・出口水分センサ、６・・・
熱風温度センサ、７・・・外気温度センサ、１０・・・
目標水分設定器The drawing is a block diagram showing an example of an apparatus for carrying out the method according to the invention. 1...Drying capacity calculation block, 2...Saturated water vapor pressure calculation block, 3...Hot air temperature calculation block, 4...
・Artificial moisture sensor, 5... Outlet moisture sensor, 6...
Hot air temperature sensor, 7...Outside air temperature sensor, 10...
Target moisture setting device
Claims (1)
燥する穀物乾燥機において、乾燥槽に張り込まれる前の
穀物の水分と乾燥槽から送出される穀物の水分を所定間
隔で測定してその差で実績乾減率を算出し、乾燥風の熱
風温度、外気温度、外気の湿球温度および上記実績乾減
率から乾燥機の乾燥能力を算出し、穀物の乾燥目標水分
と乾燥槽に張り込まれる前の穀物の水分との差から目標
乾減率を算出し、上記乾燥機の乾燥能力と目標乾減率と
で乾燥風の熱風温度を制御することを特徴とする穀物乾
燥機における乾燥制御方法。In grain driers that dry grain by continuously flowing down the drying tank, the moisture content of the grain before being loaded into the drying tank and the moisture content of the grain sent out from the drying tank is measured at predetermined intervals. The actual drying loss rate is calculated from the difference, and the drying capacity of the dryer is calculated from the hot air temperature of the drying air, the outside air temperature, the wet bulb temperature of the outside air, and the actual drying loss rate above, and the drying target moisture content of the grain and the tension in the drying tank are calculated. Drying in a grain dryer, characterized in that a target drying loss rate is calculated from the difference between the moisture content of the grain before it is loaded, and the hot air temperature of the drying air is controlled based on the drying capacity of the dryer and the target drying loss rate. Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33344988A JPH02183790A (en) | 1988-12-31 | 1988-12-31 | Drying control method in grain dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33344988A JPH02183790A (en) | 1988-12-31 | 1988-12-31 | Drying control method in grain dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02183790A true JPH02183790A (en) | 1990-07-18 |
Family
ID=18266217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33344988A Pending JPH02183790A (en) | 1988-12-31 | 1988-12-31 | Drying control method in grain dryer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02183790A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206842A (en) * | 2013-04-08 | 2013-07-17 | 上海烟草集团有限责任公司 | Multi-parameter control system of roller dryer |
-
1988
- 1988-12-31 JP JP33344988A patent/JPH02183790A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206842A (en) * | 2013-04-08 | 2013-07-17 | 上海烟草集团有限责任公司 | Multi-parameter control system of roller dryer |
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