JPS5914709B2 - Grain drying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention efficiently produces high-quality dried grains by drying the grains so that the grain temperature and drying rate satisfy predetermined conditions, thereby reliably preventing the occurrence of shell cracking and deterioration of taste. (Regarding grain drying methods that can be obtained.

When drying grains using a heating device or blower device, it is important to determine not only the temperature of the hot air and the amount of hot air applied to the grains (
If the temperature and moisture release rate of the grains themselves are not maintained within appropriate ranges, the quality of the grains will deteriorate significantly, resulting in poor taste, cracking of the grains, or problems with drying efficiency (
This may cause inconveniences such as not being carried out.

However, in the conventional drying method of this type, after measuring the initial moisture content of the grain to be dried, the drying time is calculated assuming the finished moisture content and drying loss rate per hour, and the calculated time is set on a timer. Then, the hot air temperature was determined according to the outside air temperature and the measured grain amount, and the drying operation was continued while the hot air temperature was maintained at the same temperature during the setting time to obtain dry grain.

Therefore, as mentioned above, if drying is simply continued under the regulated conditions of hot air temperature, changes in outside temperature and humidity during long drying operations will cause the grain temperature and drying rate to change depending on the moisture content of the grain. During the drying process, the grain temperature becomes abnormally high and moisture evaporates quickly (this results in overdrying, which eventually leads to cracking of the grain). Otherwise, the quality of the grain itself is significantly reduced due to the influence of abnormally high temperatures, resulting in adverse effects such as deterioration of taste, and it has been desired to develop a fundamental drying method to improve this problem.

In view of the above, the present invention sequentially detects the grain temperature and drying rate of the grain to be dried over time, and determines each detected grain temperature and drying rate in advance in accordance with the moisture content of the grain. By finishing the drying while controlling the heating device or blower device so that the drying temperature is below the predetermined value, it is possible to reliably prevent the occurrence of shell cracking and deterioration of taste, and improve drying efficiency. The present invention aims to provide a grain drying method that can obtain dry grains, and a block circuit for carrying out the grain drying method according to the present invention will be described below.

In FIG. 1, reference numeral 1 denotes a grain temperature detector for detecting the grain temperature of the grain to be dried over time during the drying time and sending the detection signal to the comparison circuit 4, which is a grain temperature detector according to the present invention. 1 is designed to detect the grain temperature of the grain to be dried over time, for example every hour, from the beginning of drying until the end of drying.

Reference numeral 2 denotes a drying rate detector for detecting the drying rate of the grain to be dried, that is, the drying rate over time during the drying time, and sending the detected signal to the comparison circuit 4, The detector 2 detects the drying loss rate, that is, the drying speed, of the grain to be dried over time, for example every hour, from the beginning of drying until the end of drying.

Reference numeral 3 denotes a grain temperature and drying rate reference setting circuit, and this circuit 3 sets grain temperature and drying rate standards that are determined in advance according to the moisture content of the grain when the grain temperature and drying rate of the grain to be dried are detected over time. It has the role of sending the signals of the temperature reference value and the drying rate reference value to the comparison circuit 4, respectively, and the grain temperature and drying rate reference setting circuit 3 includes a signal as shown in FIG. For example, the grain temperature is maintained at 35°C or less until the moisture content of the dried grain reaches 201), and the grain temperature is maintained at 40°C or less when the moisture content of the dried grain is between 20% and 14%. A grain temperature standard table such as
As shown in Figure 3, the moisture content of the dried grain is 20%.
Until then, the drying rate was 1% per hour, between the moisture content of 20 and 17, the hourly drying rate was 0.8, and between the moisture content of 17 and 14%, the hourly drying was 0.6%. A drying loss rate reference table determined to be maintained so as to be maintained is incorporated in each case.

4 receives signals sent over time from the grain temperature detector 1 and drying rate detector 2, respectively, and signals sent over time from the grain temperature and drying rate reference setting circuit 3. A comparison circuit for comparing and sending a signal to the heating device 6 or the blower device 70 control circuit 5, which compares the grain temperatures detected by the grain temperature detector 1 and the drying rate detector 2, respectively, during the drying operation. When the drying rate value is larger than the value determined in the grain temperature standard table and the drying rate standard table shown in FIGS. 2 and 3, a signal is immediately sent to the control circuit 5 to control the heating device. The amount of fuel supplied to 6 or the amount of air blown by the blower 7 is controlled so that the grain temperature and drying rate are absolutely below the grain temperature set value and the drying rate standard set value to prevent abnormally high temperature or drying rate. It has the role of performing drying while preventing the occurrence of shell cracking and quality deterioration due to rapid drying.

Next, the operation of the present invention will be explained.

Now, when you want to dry grains with an initial moisture content of 24%, for example, to a finished moisture content of 14%, first set the hot air temperature or air flow rate so that the grain temperature of the dried grains is 35°C or less, and the drying rate is 35°C or less. The heating device 6 or the blower device 7 is started so that the temperature becomes 1 or less, and the drying start-up work is carried out.

Then, the detected grain temperature value and the detected drying rate value detected by the grain temperature detector 1 and the drying rate detector 2 are sent as signals to the comparison circuit 4 every hour, and the grain to be dried is The temperature and drying rate reference setting circuit 3 adapts to the moisture content of the grain over time, and the grain temperature reference value and the drying rate reference value shown in FIGS. 2 and 3 simultaneously serve as signals. The signals are sent to the comparison circuit 4 and compared there.

As a result, the grain to be dried has a moisture content of up to 20φ due to the time-dependent detection action of the grain temperature detector 1 and drying rate detector 2.
℃ or less, drying rate of 1 part per hour or less, and moisture content of 2
Between 0 and 17, only the drying rate is 0.8% or less, and when the moisture content is between 20 and 14, the grain temperature is 40°C.
Below, the drying loss rate between moisture content 17 and 14 is 0.6%
A signal is sent to the antibacterial circuit 5 so as to keep the moisture content at or below 100%.Based on this control signal, the heating device 6 or blowing device 7 is automatically controlled respectively to control the hot air temperature or the amount of air blown, and to control the moisture content. The drying operation is continued until the finished moisture content reaches a predetermined final moisture content of 14%.

By the way, during the above-mentioned drying process, the grain temperature and drying rate values are larger than the values in the grain temperature standard table and the drying rate standard table due to the influence of outside temperature and humidity, etc. When detected by the device 2, the comparison circuit 4 immediately operates to send a signal to the control circuit 5 so that the grain temperature and drying rate values are below the preset grain temperature and drying rate reference values. By controlling the amount of fuel supplied to the heating device 6 or the amount of air blown by the blower 7, the grain temperature is maintained at a preset temperature or lower and the drying rate is maintained at or below a preset value according to the moisture content, and drying is carried out. It is something that

Of course, the object of the present invention can also be achieved by controlling both the heating device 6 and the blower device 7 at the same time.

Therefore, due to the above-mentioned control action, the grain to be dried is dried under ideal values for grain temperature and drying rate from the initial stage of drying until it reaches the finished moisture content, so that it can be dried rapidly under abnormally high temperature conditions. It is possible to reliably prevent the shell cracking phenomenon or quality deterioration that occurs due to this, and to continuously produce delicious dried grains without shell cracks using the dryer.

In short, the present invention sequentially detects the grain temperature and drying rate of the grain to be dried over time, and the detected grain temperature and the detected drying rate are set in advance in accordance with the moisture content of the grain. Since the drying was completed while controlling the heating device 6 or the blower device 7 so that the temperature was below a predetermined value, the grain temperature and drying rate were always controlled to be below the predetermined value during the period from the beginning of drying to the end of drying. This enables the ideal drying process to be carried out as efficiently as possible without sacrificing quality, thereby preventing shell cracking and quality deterioration due to abnormally high speed drying and abnormally high grain temperatures. It has the effect of easily and efficiently producing high-quality dried grains with a high germination rate and good taste.

[Brief Description of the Drawings] Fig. 1 is a block circuit diagram for implementing the method according to the present invention, Fig. 2 is an example of a grain temperature standard table set in advance, and Fig. 3 is a block circuit diagram for implementing the method according to the present invention. This is an example of a drying loss rate standard table. 1... Grain temperature detector, 2... Drying rate detector, 3... Grain temperature and drying rate reference setting circuit, 4
...Comparison circuit, 5...Control circuit, 6.
...-7 JO temperature device, 7... air blower.

Claims (1)

[Claims] 1. Grain temperature and drying rate of the grain to be dried are detected sequentially over time, and each detected grain temperature and detected drying rate are below a predetermined value set in advance according to the moisture content of the grain. A grain drying method characterized in that the drying is completed while controlling a heating device or a blower device so that the drying is carried out.