JPH0364189B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is capable of efficiently drying to a predetermined moisture content in a pre-desired drying time under a certain condition in which the combustion amount for hot air supply is the best combustion efficiency. Concerning grain drying methods. [Prior Art] Conventionally, a grain dryer equipped with an automatic drying control function is described in, for example, Japanese Unexamined Patent Publication No. 150475/1983, and is widely known and used. [Problems to be solved by the invention] By the way, in the above conventional grain dryer,
Since drying is controlled by drying control elements such as grain moisture and temperature, the required drying time is often inconsistent with the drying time desired by the operator. This may interrupt the next scheduled time and interfere with the work, which is particularly inconvenient when the scheduled drying finish time falls late at night or early in the morning. In addition, in the conventional grain dryer mentioned above, the amount of combustion is controlled to increase or decrease in order to control the temperature of the drying hot air, but when the amount of combustion is reduced, the combustion efficiency decreases, so the drying capacity of the dryer is reduced. There were drawbacks that prevented it from being utilized to its full potential. In view of these conventional circumstances, the present invention has been developed to dry and finish grains to a predetermined moisture content in a pre-desired drying time at the start of drying work, and to increase or decrease the amount of combustion for supplying hot air. To provide a grain drying method that can perform efficient drying by always maximizing the drying capacity of a dryer by keeping the amount of combustion in a constant state with the best combustion efficiency without controlling it. This is the purpose. [Means for Solving the Problems] The present invention is configured as follows as a technical means for achieving the object. That is, the grain drying method according to the present invention calculates the required moisture content for drying from the initial moisture content of the grain and its finished drying moisture content, and calculates the required moisture content, selected drying loss rate, and combustion amount for supplying hot air to achieve the best combustion efficiency. Keep the drying capacity of the dryer constant, calculate the amount of grain that can be finished drying in the desired drying time from that constant drying capacity, and use this as the amount of grain loaded in one drying operation of the dryer. This is a characteristic feature. [Function] According to the grain drying method according to the present invention, grains are dried to a predetermined moisture content in a previously desired drying time, regardless of the amount of moisture required for drying. That is,
Depending on the moisture requirement for drying calculated from the initial moisture content and finished moisture content of the grain, when the moisture requirement for drying is high, the amount of grain loaded in one drying operation of the dryer is small, and when the moisture required for drying is low, the amount of grain loaded in one drying operation is small. Since the amount is large, the drying time can be made the same regardless of the amount of moisture required for drying, and thereby the drying of the grain can be completed within a pre-desired drying time. According to the grain drying method according to the present invention,
Since drying is performed under the drying capacity of the dryer, which does not control the increase or decrease of the amount of combustion for supplying hot air and keeps it constant for the best combustion efficiency, it is possible to improve the drying efficiency. [Example] Next, an example of the grain drying method according to the present invention will be described. Typically, the initial moisture _M1 of harvested grain is 26-20
%, the finishing moisture of the grain is around 15%, and the convenient drying time in a daily work cycle is 14 to 16 hours. In addition, the allowable drying loss rate (drying rate ΔMmax) is 0.8 to prevent shell cracking.
%/hour. Therefore, the dry finishing moisture content _M2 of the grain is 15.5%,
The desired drying time Hr is 14 hours (from 6:00 pm on the same day to 8:00 am on the next day), and the drying capacity η of the dryer is 20 koku%, assuming that the combustion amount for hot air supply is constant for the best combustion efficiency. / hour, the grain filling amount W (stone) is W=η×Hr/M ₁ −M ₂ . Here, M ₁ −M ₂ is the moisture required for drying the grain. Under these conditions, the minimum grain loading amount Mm is Wm = η / ΔMmax = 20 / 0.8 = 25 (stones) The initial moisture value M ₁ max of grain that can be dried in 14 hours at drying time is M ₁ =ΔMmax×Hr× _M2 =0.8×14+15.5=26.7(%). The following table shows the amount of grain loaded W ₁ and the drying loss rate (drying rate) ΔM for each value of the initial moisture content M ₁ of the grain.
Note that when the initial moisture content _M1 of the grain is 28% or more and when it is 18% or less, the drying time Hr is adjusted without changing the grain loading amount W. Therefore, the figures are shown in parentheses in the table.

[Table] [Effects of the Invention] As described above, the present invention calculates the required moisture content for drying from the initial moisture content of the grain and its finished drying moisture content, calculates the required moisture content for drying, the selected drying loss rate, and the combustion for supplying hot air. Keep the drying capacity of the dryer constant to achieve the best combustion efficiency, calculate the amount of grain that can be finished drying in the desired drying time from that constant drying capacity, and calculate this as the amount of grain in one drying operation of the dryer. Since this is a grain drying method that uses the amount of pressure, it is possible to finish drying the grain to a predetermined moisture content in a pre-desired drying time at the start of the drying process.Moreover, it is possible to increase or decrease the amount of combustion to supply hot air. To achieve efficiency in which the drying capacity of a dryer can always be utilized to the maximum by keeping the combustion amount in a constant state with the best combustion efficiency without performing any oxidation.

Claims (1)

[Claims] 1. Calculate the required moisture content for drying from the initial moisture content of the grain and its finished drying moisture content, and then set the drying capacity of the dryer that provides the best combustion efficiency using the required moisture content, the selected drying loss rate, and the amount of combustion for supplying hot air. The grain drying method is characterized in that the amount of grain that can be dried in a desired drying time is calculated from the constant drying capacity, and this is used as the amount of grain loaded in one drying operation of the dryer.