JP6933014B2 - Grain drying method - Google Patents

Description

The present invention relates to a grain drying method capable of efficiently operating the grain drying equipment in a grain drying equipment in which a plurality of circulating grain dryers are arranged side by side.

Conventionally, it is well known that grains such as rice and wheat are dried by a circulating grain dryer.
The dryer is provided with a storage section at the upper part and a hot air drying section at the lower part, and is provided with a grain raising machine. The grain is discharged from below the hot air drying section and returned to the upper part of the dryer by the grain frying machine to circulate and dry the grain.

By the way, in a grain drying preparation facility such as a country elevator, grains are dried by installing a grain drying facility in which a plurality of the circulating grain dryers are arranged side by side (see, for example, Patent Documents 1 to 3). .).

The grain drying equipment described in Patent Documents 1 and 2 dries grains while circulating them in each dryer, and by installing a large number of dryers, a large amount of grains can be dried at one time. ..

However, the grain drying equipment described in Patent Documents 1 and 2 has a problem that the cost becomes high when a large number of dryers are installed according to the received amount in the harvest season.
In addition, there is a problem of inefficiency due to the existence of a dryer that does not operate except during the harvest season.

If the number of dryers installed is small and each dryer is operated multiple times when the amount of goods received is large, each of the above problems can be solved, but in order to properly handle the amount of goods received every day, There is naturally a limit to the number of dryers that can be installed.

On the other hand, the grain drying equipment described in Patent Document 3 allows each dryer to be switched between a circulation state and a progressive state, and by setting the circulation state, the received grain is circulated for each dryer. The primary drying is performed and the grain is put into a progressive state, so that the primary dried grain is subjected to finish drying while being progressively moved to an adjacent dryer.

The grain drying equipment described in Patent Document 3 can improve the working capacity by increasing the amount of grain drying processed.

However, the grain drying equipment described in Patent Document 3 has a problem that the finish drying cannot be started until the primary drying is completed, and the grain drying equipment cannot be operated efficiently.

Jikkai Sho 51-155867 Japanese Unexamined Patent Publication No. 5-126466 Jikkenhei 4-74289 Gazette

Therefore, an object of the present invention is to provide a grain drying method capable of efficiently operating the grain drying equipment in a grain drying equipment in which a plurality of circulating grain dryers are arranged side by side.

In order to achieve the above object, the invention according to claim 1 is
It is a grain drying facility that has a storage section at the top and a hot air drying section at the bottom, and multiple circulating grain dryers with a grain frying machine installed side by side. In the grain drying method in the grain drying facility, the operation mode can be switched between the circulation mode in which the grain is dried and the continuous flow mode in which the grain is dried while being progressively moved from the first-stage dryer to the final-stage dryer.
At the start of the drying operation, the operation mode is set to the circulation mode, and the grain is sequentially poured from the final stage dryer to the first stage dryer without passing through other dryers in the direction opposite to the forward feed direction in the continuous flow mode. The grain is dried while being sequentially circulated from the final stage dryer.

The invention described in claim 2 is the invention described in claim 1.
During the drying operation in the circulation mode, after the grain is charged to the first stage dryer, if there is a grain to be further charged, the operation mode is switched to the continuous flow mode, and the grain is put into the first stage dryer. The grains of the dryers of each stage are sequentially moved toward the dryers of the final stage and dried until they reach the first drying state, and the grains of the dryers of the final stage are dried from the first stage dryer. While continuously discharging dry grains,
When there is no grain to be stuffed before the grain is stuffed into the first-stage dryer, or when there is no grain to be stuffed after the grain is stuffed into the first-stage dryer. , The operation mode is continuously set to the circulation mode, and the grains are circulated in the dryers of each stage in which the grains are filled, and dried until the second dry state has a lower moisture value than the first dry state. It is preferable that the grains in the second dried state are sequentially discharged from the dryers in each stage from the dryer in the final stage toward the dryer in the first stage.

The invention described in claim 3 is the invention described in claim 2.
During the drying operation in the circulation mode, after the grains have been charged to the dryer in the first stage, if there are grains to be further charged, the final stage before switching the operation mode to the continuous flow mode. With the discharge of grains from the dryer stopped, the grains are continuously stuck in the first-stage dryer, and the grains in the dryers in each stage are sequentially moved toward the final-stage dryer. It is preferable to fill the space generated in the upper part of the storage portion of each dryer with the drying operation of the circulation mode, and to switch the operation mode to the continuous flow mode when there are grains to be further charged.

The invention according to claim 4 is the invention according to claim 2 or 3.
If there are no grains to be squeezed during the drying operation in the continuous flow mode, the operation mode is switched to the second circulation mode, the grains are circulated in each stage dryer, and the final stage is dried. After the grain of the machine is dried until it reaches the second dry state, the operation mode is switched to the second continuous flow mode, and the grain in the first dry state discharged from the dryer in the final stage is the first stage. While continuously sticking to the dryer of the above, the grains of the dryer of each stage are sequentially moved toward the dryer of the final stage and dried until the second drying state is reached, and from the dryer of the final stage. It is preferable to continuously discharge the grains in the second dried state.

The invention according to claim 5 is the invention according to claim 4.
After switching to the second circulation mode, circulating the grains in each stage dryer and drying the grains in the final stage dryer until the grains are in the second dry state, the operation mode is set to the second continuous mode. Before switching to the flow-down mode, in a state where the discharge of grains from the final stage dryer is stopped, the grains in the first dry state discharged from the final stage dryer are continuously connected to the first stage dryer. The grains of the dryers in each stage are sequentially moved toward the dryers in the final stage, and the space is created in the upper part of the storage section of each dryer as a result of the drying operation in the second circulation mode. It is preferable to switch the operation mode to the second continuous flow mode when the grain in the first dry state to be filled and further charged is present.

The invention according to claim 6 is the invention according to claim 4 or 5.
During the drying operation in the second continuous flow mode, if there is no grain in the first dry state to be squeezed, the operation mode is switched to the circulation mode again, and the grain is dried in each stage of the dryer. It is preferable to circulate and dry the grain until it reaches the second dry state, and then sequentially discharge the grain in the second dry state from the dryer in each stage toward the dryer in the first stage. ..

The invention according to claim 7 is the invention according to claim 1.
During the drying operation in the circulation mode, after the grain is charged to the first stage dryer, if there is a grain to be further charged, the operation mode is switched to the continuous flow mode, and the grain is put into the first stage dryer. The grains of the dryer of each stage are sequentially moved toward the dryer of the final stage and dried until the target drying state is reached. While continuously discharging grain
When there is no grain to be stuffed before the grain is stuffed into the first-stage dryer, or when there is no grain to be stuffed after the grain is stuffed into the first-stage dryer. , The operation mode is continuously set to the circulation mode, and the grain is circulated in each stage dryer in which the grain is filled and dried until the target drying state is reached, from the final stage dryer to the first stage dryer. It is preferable that the grains in the target dry state are sequentially discharged from the dryer of each stage.

The invention according to claim 8 is the invention according to claim 7.
During the drying operation in the circulation mode, after the grains have been charged to the dryer in the first stage, if there are grains to be further charged, the final stage before switching the operation mode to the continuous flow mode. With the discharge of grains from the dryer stopped, the grains are continuously stuck in the first-stage dryer, and the grains in the dryers in each stage are sequentially moved toward the final-stage dryer. It is preferable to fill the space generated in the upper part of the storage portion of each dryer with the drying operation of the circulation mode, and to switch the operation mode to the continuous flow mode when there are grains to be further charged.

The invention according to claim 9 is the invention according to claim 7 or 8.
If there are no grains to be squeezed during the drying operation in the continuous flow mode, the operation mode is switched to the circulation mode again, and the target drying state is reached while circulating the grains in each stage dryer. It is preferable that the grains in the target dried state are sequentially discharged from the dryers in each stage toward the dryers in the first stage from the dryers in the final stage.

The invention according to claim 10 is the invention according to any one of claims 1 to 9.
It is preferable to perform the drying operation so that the time for circulating the grain once for each dryer in the circulation mode and the time for sequentially feeding the grain once between the dryers in the continuous flow mode are the same time.

The invention according to claim 11 is the invention according to any one of claims 2 to 10.
During the drying operation in the continuous flow mode, it is preferable that the dryer in the final stage is operated by blowing air and the grains are dried by blowing air drying.

According to the grain drying method in the grain drying equipment of the present invention, at the start of the drying operation, the operation mode is set to the circulation mode, and the grain is changed from the final stage dryer to the first stage dryer in the direction opposite to the forward feed direction in the continuous flow mode. The grains are sequentially squeezed toward each other without going through other dryers, and the grains squeezed into the dryers of each stage are dried while being sequentially circulated from the dryer of the final stage. By appropriately switching the operation mode between the dryers, even if the amount of grain received exceeds the total capacity of the dryers, the grain drying equipment can be operated efficiently without letting each dryer play.
Further, according to the grain drying method in the grain drying facility of the present invention, at the end of the drying operation, the operation is sequentially stopped from the final stage dryer to the first stage dryer, so that the next (next day) drying operation is performed. At the start, grains can be sequentially charged from the final stage dryer, so that the grain drying facility can be operated efficiently.

Further, in the present invention, when the operation mode is switched from the circulation mode to the continuous flow mode, the bulk of the grain in each dryer is reduced due to the drying operation in the circulation mode, and a space is created above the storage portion of each dryer. However, according to the grain drying method in the grain drying facility of the present invention, before switching the operation mode to the continuous flow mode, the grain is dried in a state where the discharge of the grain from the final stage dryer is stopped. While continuously filling the first-stage dryer, the grains of the dryers of each stage are sequentially moved toward the final-stage dryer, and the space generated above the storage portion of each dryer is filled with grains. As a result, when the amount of unloaded grain is within the total volume of the space generated in each of the dryers, all the unloaded grains can be charged, and the operation mode is continuously dried as the circulation mode. As a result, the drying operation can be terminated at an early stage, so that the grain drying equipment can be operated efficiently.

Schematic diagram of grain drying equipment. The flow chart of the grain drying method in Example 1 (the 1). FIG. 2 is a flow chart of a grain drying method in Example 1. FIG. 3 is a flow chart of a grain drying method in Example 1. FIG. 4 is a flow chart of a grain drying method in Example 1. FIG. 5 is a flow chart of a grain drying method according to Example 1. FIG. 6 is a flow chart of a grain drying method in Example 1. The flow chart of the grain drying method in Example 2 (the 1). FIG. 2 is a flow chart of a grain drying method in Example 2. FIG. 3 is a flow chart of a grain drying method in Example 2. FIG. 4 is a flow chart of a grain drying method in Example 2.

Embodiments of the present invention will be described with reference to the drawings.
<Grain drying equipment>
FIG. 1 shows a schematic explanatory view of a grain drying facility used in the embodiment of the present invention.
The grain drying facility 1 is a well-known hot air dryer having a storage section at the upper part and a hot air drying section at the lower part, and a plurality of circulating grain dryers 2 to which a grain frying machine 3 is attached are arranged side by side. Be prepared.

The grain drying facility 1 is associated with each of the dryers 2 and has a route for refluxing grains discharged from each dryer 2 and fried by the attached grain frying machine 3 to the same dryer 2. It has a switching valve 4 that distributes to a path that does not allow reflux. Further, it has a switching valve 5 for distributing the grain distributed to the non-reflux route to a route for transferring the grain to the dryer 2 in the next stage and a route for carrying it out to the temporary storage tank 11 or the silo 12.

The grain drying facility 1 includes a grain raising machine 6 for frying the received grain, a grain tank 7 into which the fried grain is put, a grain transport path 8 for transporting the grain delivered from the grain tank 7, and the above. A grain raising machine 9 for frying grains transported by a grain transport path 8, a grain loading path 10 for carrying the fried grains into each of the dryers 2, a temporary storage tank 11 or a silo from each of the dryers 2. 12 is provided with a grain carry-out route 13 for carrying out grains. Further, a grain sensor 14 is arranged near the discharge port of the grain raising machine 9.

In the grain drying facility 1, the received grain is fried by the grain raising machine 6 and put into the grain tank 7. The grain put into the grain tank 7 is first fed out from the lower part of the first grain tank 71 in a fixed amount, transported by the grain transport path 8, and fried by the grain frying machine 9, and then the grain delivery path 10 is used. It is conveyed to each of the dryers 2 and stretched from above.

The grain drying facility 1 has a circulation mode in which grains are dried while being circulated in each dryer, and a continuous flow mode in which grains are dried while being progressively moved from the first-stage dryer 21 to the final-stage dryer 26. The operation mode can be switched between.

When the circulation mode is selected, the grains stretched into each dryer 2 from above the storage section pass from the upper part to the lower part of each dryer 2 and are discharged from below the hot air drying section. By being guided by the switching valve 4 to a path in which the grain is fried by each of the fried grain machines 3 and returned to the same dryer 2, the grains can be dried while being circulated in each dryer.

On the other hand, when the continuous flow mode is selected, the grain discharged from the dryer 2 in each stage is fried by each of the frying machines 3 and is not returned to the same dryer 2 by the switching valve 4. After being guided, the switching valve 5 further guides the dryer to the next-stage dryer 2, so that the drying can be performed while being progressively moved to the next-stage dryer 2.

Grains discharged from each of the dryers 2 and guided by the switching valve 4 to a route that does not return to the same dryer 2, and then further guided by a switching valve 5 to a route that is carried out to the temporary storage tank 11 or the silo 12. Is transported by the carry-out transport path 13 and stored in the temporary storage tank 11 or the silo 12. The grain stored in the temporary storage tank 11 is supplied to the second grain tank 72 and dried again. Can be made to.

<Cereal drying method>
Next, the grain drying method in the grain drying equipment 1 will be described.
In the embodiment of the present invention, the grain drying equipment 1 is provided with six circulating grain dryers 2 having a capacity of 30 tons arranged side by side.
In the grain drying facility 1, the time for circulating the grain once for each dryer in the circulation mode and the time for moving the grain between the dryers once in the continuous flow mode are 1 hour each (30 t / hour). ), And the same dryness reduction rate (moisture reduction rate per hour) in each dryer 2 in the circulation mode and the continuous flow mode, that is, in Example 1, the dryness reduction rate is 0.6% during hot air drying, and the air is blown. It is operated so that the drying reduction rate is 0.3% at the time of drying, and in Example 2, the drying reduction rate is 1.2% at the time of hot air drying and 0.6% at the time of blowing air drying.
Here, it is assumed that the water content of about 24% of the raw paddy after harvesting is reduced to about 17% in the semi-dry state to obtain the semi-dry paddy.

[Example 1]
2 to 7 show a flow chart of the grain drying method in Example 1. Example 1 is an example in which raw paddy is dried in two stages to obtain semi-dry paddy.

(1) Regarding FIG. 2 At the start of the drying operation, as shown in FIG. 2, the operation mode is set to the circulation mode, and the raw paddy fed from the lower part of the grain tank 7 is finally fed in the direction opposite to the forward feed direction in the continuous flow mode. It is sequentially installed from the 6-stage dryer 26 of the stage toward the 1-stage dryer 21 of the first stage. At that time, raw paddy is detected by the grain sensor 14 arranged near the discharge port of the grain frying machine 9, and if the raw paddy to be stuffed continues to exist, it is stuffed up to the one-stage dryer 21. continue. As soon as the filling of the raw paddy is completed, the dryer 2 of each stage starts hot air drying while sequentially circulating the raw paddy from the 6-stage dryer 26.

(2) FIG. 3 After the raw paddy is charged to the one-stage dryer 21, if the total capacity (180 tons) of the six dryers 2 is exceeded and there is raw paddy to be further charged, there is raw paddy. As shown in FIG. 3, the operation mode is switched to the continuous flow mode. Then, the raw paddy is continuously stuck in the one-stage dryer 21, and the paddy of the dryer 2 in each stage is moved toward the six-stage dryer 26 in a progressive manner to the dryer 2 in the subsequent stage. The paddy is dried until it becomes dry, and the paddy in the first dry state is continuously discharged from the 6-stage dryer 26 and temporarily stored in the temporary storage tank 11.

Here, in the dryer 2 of each stage, the hot air temperature is controlled so that the paddy is dried at a drying reduction rate of 0.6%, so that the moisture value of the raw paddy of about 24% is 1 in the continuous flow mode. From the stage dryer 21 to the 6-stage dryer 26, in order of about 23.4%, about 22.8%, about 22.2%, about 21.6%, about 21.0%, about 20.4%. The paddy in the first dry state (hereinafter referred to as "half-dry paddy") which has decreased to the first dry state (hereinafter referred to as "half-dry state") having a moisture value of about 21% in the 6-stage dryer 26. ) Can be obtained.
During the drying operation in the continuous flow mode, it is preferable that the 6-stage dryer 26 is used as an blast operation to blow and dry the paddy. In that case, the 6-stage dryer 26 has a drying reduction rate of 0.3%. Since it is dried, half-dried paddy with a moisture value of about 20.7% is obtained.

(3) Regarding FIG. 4 On the other hand, in FIG. 2, during the drying operation in the circulation mode, there is no raw paddy to be pasted before the raw paddy is stuck into the one-stage dryer 21, or If there is no raw paddy to be pasted after the raw paddy is stuck in the one-stage dryer 21, the operation mode is continuously set to the circulation mode, and as shown in FIG. 4, the raw paddy is stuck. In the dryer 2 of each stage, the paddy is circulated 12 times while being circulated, and dried until the moisture value becomes a semi-dry state (second dry state) of about 17%, and the 6-stage dryer 26 to the above 1 Semi-dry paddy is sequentially discharged from the dryer 2 of each stage toward the stage dryer 21, stored in the silo 12, and the drying operation is completed.
During the drying operation in the circulation mode, it is preferable that each dryer 2 switches to the blower operation at the final stage of the 12th circulation when the drying of the paddy is completed, and blows and dries the paddy for about 10 minutes.

Here, when the drying operation is performed in the circulation mode, the bulk (volume) of the paddy is reduced in each dryer 2, and a space is created in the upper part of the storage portion of each dryer 2. This space is the largest in the final stage 6-stage dryer 26, which has a long drying time, for example, about 6% of the storage portion, and hereinafter, 5%, 4%, and 3% toward the first stage 1-stage dryer 21 side. %, 2%, 1% and gradually decrease.

Therefore, in FIG. 2, during the drying operation in the circulation mode, after the raw paddy is charged to the one-stage dryer 21, if there is raw paddy to be further charged, the operation mode is switched to the continuous flow mode. Previously, in a state where the discharge of paddy from the 6-stage dryer 26 was stopped to stop circulation, a burner (not shown) was stopped, and hot air drying was stopped, the raw paddy was continuously connected to the 1-stage dryer 21. The paddy of the dryer 2 in each stage can be moved in order toward the 6-stage dryer 26, and the space generated in the upper part of the storage portion of each dryer 2 can be filled with the paddy.

In this case, if the amount of the raw paddy to be further charged is within the total volume of the space generated in the upper part of the storage portion of each of the dryers 2, all the raw paddy can be charged, and the operation mode can be continued. Without switching to the flow-down mode, the circulation mode is continued, and as shown in FIG. 4, the drying operation is terminated early by drying the dryer 2 in each stage until the moisture value becomes a semi-dry state of about 17%. Therefore, the grain drying equipment can be operated efficiently.

Further, if the space is increased above the storage portion of each dryer 2, the tempering time is shortened and the moisture inside the paddy is not sufficiently balanced and the drying efficiency is lowered. By filling the generated space with paddy, drying is efficiently performed in each of the dryers 2.

Since the moisture value of the paddy in each of the adjacent dryers 2 is an approximate value of a difference of about 0.6%, even if the paddy is added from the dryer in the previous stage to the storage portion of each dryer 2, drying unevenness will occur. There is no risk of it occurring.

(4) Regarding FIG. 5 Next, in FIG. 3, when there is no raw paddy to be squeezed during the drying operation in the continuous flow mode, the operation mode is changed to the circulation mode again as shown in FIG. The paddy is circulated in the dryer 2 of each stage and dried until the paddy of the 6-stage dryer 26 is in a semi-dry state.
In that case, it is preferable that the 6-stage dryer 26 switches to the blower operation at the final stage of drying the paddy and blows and dries the paddy for about 10 minutes.

Here, in the dryer 2 of each stage, the hot air temperature is controlled so that the paddy is dried at a drying reduction rate of 0.6%, so that the moisture value of about 24% of the raw paddy is from the one-stage dryers 21 to 6. It decreases in the order of about 19.8%, about 19.2%, about 18.6%, about 18.0%, about 17.4%, and about 16.8% toward the stage dryer 26.

(5) Regarding FIG. 6 In FIG. 5, during the drying operation in the circulation mode, the paddy of the 6-stage dryer 26 is dried until it becomes semi-dry, and then the operation mode is changed again as shown in FIG. Switch to continuous flow mode. Then, in FIG. 3, half-dry paddy that is temporarily stored in the temporary storage tank 11 and has been previously transported to the second grain tank 72 is continuously charged into the one-stage dryer 21 and each of them. The paddy of the stage dryer 2 is moved toward the 6-stage dryer 26 in a progressive manner to the subsequent stage dryer 2 and dried until it becomes semi-dry, and the semi-dry paddy is continuously transferred from the 6-stage dryer 26. And discharge it and store it in the silo 12.
Again, it is preferable that the 6-stage dryer 26 blows and dries the paddy as a blower operation.

(6) Regarding FIG. 7 In FIG. 6, when the half-dry paddy to be squeezed disappears during the drying operation in the continuous flow mode, the operation mode is changed to the circulation mode again as shown in FIG. Switch to. Then, in the dryer 2 of each stage, the paddy is circulated and dried until the moisture value becomes a semi-dry state of about 17%, and the six-stage dryer 26 is directed toward the one-stage dryer 21. Semi-dry paddy is sequentially discharged from the stage dryer 2 and stored in the silo 12 to end the drying operation.

In this case as well, it is preferable that each dryer 2 switches to the blast operation at the final stage of drying the paddy and blows and dries the paddy for about 10 minutes.

Here, even when the drying operation is performed in the circulation mode in FIG. 5, the bulk (volume) of the paddy is reduced in each dryer 2, and a space is created in the upper part of the storage portion of each dryer 2.

Therefore, also in FIG. 5, during the drying operation in the circulation mode, after drying the paddy of the 6-stage dryer 26 until it becomes a semi-dry state, before switching the operation mode to the continuous flow mode, the 6-stage dryer In the state where the discharge of paddy from 26 is stopped, the circulation is stopped, the burner (not shown) is stopped, and the hot air drying is stopped, the paddy is temporarily stored in the temporary storage tank 11 in FIG. The half-dry paddy transported to 72 is continuously stuck in the one-stage dryer 21, and the paddy of the dryer 2 in each stage is sequentially fed to the dryer 2 in the subsequent stage toward the six-stage dryer 26. The paddy can be filled in the space generated in the upper part of the storage portion of each of the dryers 2.

In this case as well, if the amount of the half-dry paddy is within the total volume of the space generated in the upper part of the storage portion of each dryer 2, all the half-dry paddy can be filled in, and the operation mode is continuously flowed down. Without switching to the mode, the circulation mode is continued, and as shown in FIG. 7, the dryer 2 in each stage can be dried until the moisture value becomes about 17% in a semi-dry state.

Further, by filling the space generated in the upper part of the storage portion of each of the dryers 2 with paddy, drying is efficiently performed in each of the dryers 2.

Also here, since the moisture value of the paddy in each of the adjacent dryers 2 is an approximate value of a difference of about 0.6%, even if the paddy is added from the dryer in the previous stage to the storage portion of each dryer 2. There is no risk of uneven drying.

As described above, according to the present embodiment, even when the received amount of raw paddy exceeds the total capacity of the dryer 2, each dryer 2 is not allowed to play, and the grain drying equipment 1 is efficiently operated. be able to.
Further, at the end of the drying operation, the operation is sequentially stopped from the final stage 6-stage dryer 26 to the first stage 1-stage dryer 21, so that the 6-stage dryer will be started at the next (next day) drying operation. Since the paddy can be sequentially put in from 26, the grain drying facility 1 can be operated efficiently.

Furthermore, at the end of drying in the circulation mode, if all the paddy can be filled by adding paddy to each dryer 2 before switching to the continuous flow mode to improve the filling rate, the circulation mode will continue. Since the drying operation can be completed at an early stage by drying the paddy of the dryer 2 in each stage, the grain drying equipment 1 can be operated efficiently.

[Example 2]
8 to 11 show the flow chart of the grain drying method in Example 2. Example 2 is an example in which raw paddy is dried in one step to obtain semi-dry paddy.

(1) About FIG. 8 At the start of the drying operation, as shown in FIG. 8, the operation mode is set to the circulation mode, and the raw paddy fed from the lower part of the grain tank 7 is finally fed in the direction opposite to the forward feed direction in the continuous flow mode. It is sequentially installed from the 6-stage dryer 26 of the stage toward the 1-stage dryer 21 of the first stage. At that time, raw paddy is detected by the grain sensor 14 arranged near the discharge port of the grain frying machine 9, and if the raw paddy to be stuffed continues to exist, it is stuffed up to the one-stage dryer 21. continue. As soon as the filling of the raw paddy is completed, the dryer 2 of each stage starts hot air drying while sequentially circulating the raw paddy from the 6-stage dryer 26.

(2) FIG. 9 After the raw paddy is charged to the one-stage dryer 21, if there is raw paddy to be further charged, the operation mode is switched to the continuous flow mode as shown in FIG. Then, the raw paddy is continuously stuck in the one-stage dryer 21, and the paddy of the dryer 2 in each stage is sequentially moved to the dryer 2 in the subsequent stage toward the six-stage dryer 26 for target drying. It is dried until it becomes a semi-dry state, and the semi-dry paddy is continuously discharged from the 6-stage dryer 26 and stored in the silo 12.

Here, in the dryer 2 of each stage, the hot air temperature is controlled so that the paddy is dried at a drying reduction rate of 1.2%. Therefore, in the continuous flow mode, the moisture value of the raw paddy is about 24%. From the stage dryer 21 to the 6-stage dryer 26, about 22.8%, about 21.6%, about 20.4%, about 19.2%, about 18.0%, about 16.8%. It is possible to obtain semi-dry paddy that decreases in order and the moisture value is reduced to a semi-dry state of about 17% in a 6-stage dryer.
During the drying operation in the continuous flow mode, it is preferable that the 6-stage dryer 26 is used as an blast operation to blow and dry the paddy. In that case, the 6-stage dryer 26 produces the paddy at a drying reduction rate of 0.6%. Since it is dried, semi-dry paddy with a moisture value of about 17.4% is obtained.

(3) Regarding FIG. 10 On the other hand, in FIG. 8, during the drying operation in the circulation mode, there is no raw paddy to be stuck in until the raw paddy is stuck in the one-stage dryer 21, or If there is no raw paddy to be pasted after the raw paddy is stuck in the one-stage dryer 21, the operation mode is continuously set to the circulation mode, and as shown in FIG. 10, the raw paddy is stuck. In the dryer 2 of each stage, the paddy is circulated 6 times while being circulated to dry until the moisture value becomes a semi-dry state of about 17%, and the 6-stage dryer 26 is directed toward the 1-stage dryer 21. Then, the semi-dry paddy is sequentially discharged from the dryer 2 of each stage, stored in the silo 12, and the drying operation is completed.
During the drying operation in the circulation mode, it is preferable that each dryer 2 switches to the blowing operation at the final stage of the sixth circulation when the drying of the paddy is completed, and blows and dries the paddy for about 10 minutes.

Here, when the drying operation is performed in the circulation mode, the bulk (volume) of the paddy is reduced in each dryer 2, and a space is created in the upper part of the storage portion of each dryer 2.

Therefore, in FIG. 8, during the drying operation in the circulation mode, after the raw paddy is charged to the one-stage dryer 21, if there is raw paddy to be further charged, the operation mode is switched to the continuous flow mode. Previously, in a state where the discharge of paddy from the 6-stage dryer 26 was stopped to stop circulation, a burner (not shown) was stopped, and hot air drying was stopped, the raw paddy was continuously connected to the 1-stage dryer 21. The paddy of the dryer 2 in each stage can be moved in order toward the 6-stage dryer 26, and the space generated in the upper part of the storage portion of each dryer 2 can be filled with the paddy.

In this case as well, if the amount of the raw paddy to be further charged is within the total volume of the space generated in the upper part of the storage portion of each of the dryers 2, all the raw paddy can be charged, and the operation mode can be set. Without switching to the continuous flow mode, the circulation mode is continued, and as shown in FIG. 10, the drying operation is completed early by drying the dryer 2 in each stage until the moisture value becomes a semi-dry state of about 17%. Therefore, the grain drying equipment can be operated efficiently.

Further, if the space is increased above the storage portion of each dryer 2, the tempering time is shortened and the moisture inside the paddy is not sufficiently balanced and the drying efficiency is lowered. By filling the generated space with paddy, drying is efficiently performed in each of the dryers 2.

Since the moisture value of the paddy in each of the adjacent dryers 2 is an approximate value of a difference of about 1.2%, even if the paddy is added from the dryer in the previous stage to the storage portion of each dryer 2, drying unevenness will occur. There is no risk of it occurring.

(4) Regarding FIG. 11 In FIG. 9, when there is no raw paddy to be squeezed during the drying operation in the continuous flow mode, the operation mode is switched to the circulation mode again as shown in FIG. Then, in the dryer 2 of each stage, the paddy is circulated and dried until the moisture value becomes a semi-dry state of about 17%, and the six-stage dryer 26 is directed toward the one-stage dryer 21. Semi-dry paddy is sequentially discharged from the stage dryer 2 and stored in the silo 12 to end the drying operation.

In this case as well, it is preferable that each dryer 2 switches to the blast operation at the final stage of drying the paddy and blows and dries the paddy for about 10 minutes.

As described above, also in this embodiment, even when the received amount of raw paddy exceeds the total capacity of the dryer 2, each dryer 2 is not allowed to play, and the grain drying equipment can be operated efficiently. can.
Further, at the end of the drying operation, the operation is sequentially stopped from the final stage 6-stage dryer 26 to the first stage 1-stage dryer 21, so that the 6-stage dryer will be started at the next (next day) drying operation. Since the raw paddy can be sequentially charged from 26, the grain drying facility 1 can be operated efficiently.

Furthermore, at the end of drying in the circulation mode, if all the paddy can be filled by adding paddy to each dryer 2 before switching to the continuous flow mode to improve the filling rate, the circulation mode will continue. Since the drying operation can be completed at an early stage by drying the paddy of the dryer 2 in each stage, the grain drying equipment 1 can be operated efficiently.

In the above-described embodiment of the present invention, the grain drying equipment is provided with six circulating grain dryers arranged side by side, but the present invention is not limited to this, and the number of dryers installed may be increased or decreased as appropriate. can.

In the above-described embodiment of the present invention, the case where the raw paddy can be dried in one step and the case where the raw paddy is dried in two steps have been described, but the raw paddy can also be dried in three or more steps.
Further, in the above-described embodiment of the present invention, the case where the raw paddy is dried to obtain semi-dry paddy having a water content of about 17% has been described, but the dry paddy having a lower moisture value can also be obtained.

In the above-described embodiment of the present invention, before switching the operation mode from the circulation mode to the continuous flow mode, the paddy is dried in the first stage with the discharge of the paddy from the dryer 26 in the final stage stopped and the circulation stopped. The paddy of the dryer 2 of each stage is continuously moved to the dryer 26 of the final stage in a progressive manner, and the space generated above the storage portion of each dryer 2 is filled with the paddy. Although an example has been described, it is possible to arbitrarily set whether or not to fill the space generated in the upper part of the storage portion of each dryer 2 with paddy before switching the operation mode from the circulation mode to the continuous flow mode.

In the above-described embodiment of the present invention, the case where the raw paddy is dried as a raw material has been described as an example, but the dried paddy can be further dried as a raw material.
Further, in the above-described embodiment of the present invention, paddy is used as a raw material, but other grains such as wheat can also be used as a raw material for drying.

Needless to say, the present invention is not limited to the above-described embodiment, and its configuration can be appropriately changed as long as it does not deviate from the scope of the invention.

The grain drying method of the present invention is extremely practical because the grain drying equipment can be efficiently operated in a grain drying equipment in which a plurality of circulating grain dryers are arranged side by side.

1 Grain drying equipment 2 Circulating grain dryer 21 First stage dryer 26 Last stage dryer 3 Grain raising machine 4 Switching valve 5 Switching valve 6 Grain raising machine 7 Grain tank 71 First grain tank 72 Second grain tank 8 Grain Transport route 9 Grain lifter 10 Grain import route 11 Temporary storage tank 12 Silo 13 Grain export route 14 Grain sensor

Claims (11)

It is a grain drying facility that has a storage section at the top and a hot air drying section at the bottom, and multiple circulating grain dryers with a grain frying machine installed side by side. In the grain drying method in the grain drying facility, the operation mode can be switched between the circulation mode in which the grain is dried and the continuous flow mode in which the grain is dried while being progressively moved from the first-stage dryer to the final-stage dryer.
At the start of the drying operation, the operation mode is set to the circulation mode, and the grain is sequentially poured from the final stage dryer to the first stage dryer without passing through other dryers in the direction opposite to the forward feed direction in the continuous flow mode. A method for drying grains in a grain drying facility, wherein the grains placed in the stage dryer are dried while being sequentially circulated from the final stage dryer.
During the drying operation in the circulation mode, after the grain is charged to the first stage dryer, if there is a grain to be further charged, the operation mode is switched to the continuous flow mode, and the grain is put into the first stage dryer. The grains of the dryers of each stage are sequentially moved toward the dryers of the final stage and dried until they reach the first drying state, and the grains of the dryers of the final stage are dried from the first stage dryer. While continuously discharging dry grains,
When there is no grain to be stuffed before the grain is stuffed into the first-stage dryer, or when there is no grain to be stuffed after the grain is stuffed into the first-stage dryer. , The operation mode is continuously set to the circulation mode, and the grains are circulated in the dryers of each stage in which the grains are filled, and dried until the second dry state has a lower moisture value than the first dry state. The method for drying grains in a grain drying facility according to claim 1, wherein the grains in the second dried state are sequentially discharged from the dryers in the final stages toward the dryers in the first stage. During the drying operation in the circulation mode, after the grains have been charged to the dryer in the first stage, if there are grains to be further charged, the final stage before switching the operation mode to the continuous flow mode. With the discharge of grains from the dryer stopped, the grains are continuously stuck in the first-stage dryer, and the grains in the dryers in each stage are sequentially moved toward the final-stage dryer. The second aspect of claim 2, wherein the space generated in the upper part of the storage portion of each dryer as a result of the drying operation in the circulation mode is filled with grains, and the operation mode is switched to the continuous flow mode when there are grains to be further charged. Grain drying method in grain drying equipment. If there are no grains to be squeezed during the drying operation in the continuous flow mode, the operation mode is switched to the second circulation mode, the grains are circulated in each stage dryer, and the final stage is dried. After the grain of the machine is dried until it reaches the second dry state, the operation mode is switched to the second continuous flow mode, and the grain in the first dry state discharged from the dryer in the final stage is the first stage. While continuously sticking to the dryer of the above, the grains of the dryer of each stage are sequentially moved toward the dryer of the final stage and dried until the second drying state is reached, and from the dryer of the final stage. The method for drying grains in the grain drying facility according to claim 2 or 3, wherein the grains in the second dried state are continuously discharged. After switching to the second circulation mode, circulating the grains in each stage dryer and drying the grains in the final stage dryer until the second drying state is reached, the operation mode is set to the second continuous mode. Before switching to the flow-down mode, in a state where the discharge of grains from the final stage dryer is stopped, the grains in the first dry state discharged from the final stage dryer are continuously connected to the first stage dryer. The grains of the dryers in each stage are sequentially moved toward the dryers in the final stage, and in the space generated above the storage section of each dryer as a result of the drying operation in the second circulation mode. The grain drying method in a grain drying facility according to claim 4, wherein the operation mode is switched to the second continuous flow mode when the grain in the first dried state to be filled with the grain is present. During the drying operation in the second continuous flow mode, if there is no grain in the first dry state to be squeezed, the operation mode is switched to the circulation mode again, and the grains are mixed in the dryer of each stage. Claim 4 in which the grains are dried while being circulated until they reach the second dry state, and the grains in the second dry state are sequentially discharged from the dryers in each stage from the dryer in the final stage toward the dryer in the first stage. Or the grain drying method in the grain drying facility according to 5. During the drying operation in the circulation mode, after the grain is charged to the first stage dryer, if there is a grain to be further charged, the operation mode is switched to the continuous flow mode, and the grain is put into the first stage dryer. The grains of the dryer of each stage are sequentially moved toward the dryer of the final stage and dried until the target drying state is reached. While continuously discharging grain
When there is no grain to be stuffed before the grain is stuffed into the first-stage dryer, or when there is no grain to be stuffed after the grain is stuffed into the first-stage dryer. , The operation mode is continuously set to the circulation mode, and the grain is circulated in each stage dryer in which the grain is filled and dried until the target drying state is reached, from the final stage dryer to the first stage dryer. The grain drying method in the grain drying facility according to claim 1, wherein the grains in the target dried state are sequentially discharged from the dryers at each stage. During the drying operation in the circulation mode, after the grains have been charged to the dryer in the first stage, if there are grains to be further charged, the final stage before switching the operation mode to the continuous flow mode. With the discharge of grains from the dryer stopped, the grains are continuously stuck in the first-stage dryer, and the grains in the dryers in each stage are sequentially moved toward the final-stage dryer. The seventh aspect of claim 7, wherein the space generated in the upper part of the storage portion of each dryer as a result of the drying operation in the circulation mode is filled with grains, and the operation mode is switched to the continuous flow mode when there are grains to be further charged. Grain drying method in grain drying equipment. If there are no grains to be squeezed during the drying operation in the continuous flow mode, the operation mode is switched to the circulation mode again, and the target drying state is reached while circulating the grains in each stage dryer. Grain drying in the grain drying facility according to claim 7 or 8, wherein the grains in the target dried state are sequentially discharged from the dryers in the respective stages from the dryer in the final stage to the dryer in the first stage. Method. One of claims 1 to 9 in which the drying operation is performed so that the time for circulating the grain once for each dryer in the circulation mode and the time for sequentially feeding the grain once between the dryers in the continuous flow mode are the same time. Grain drying method in the described grain drying equipment. The grain drying method in the grain drying apparatus according to any one of claims 2 to 10, wherein during the drying operation in the continuous flow mode, the dryer in the final stage is set to blow air to dry the grains.

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