JPS61259081A - Cereal-grain drying control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a grain drying control system and can be used in grain dryers and the like.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION Various methods have been studied and tried in the past for methods of correcting the drying hot air temperature based on outside air temperature and outside air relative humidity in grain dryers, etc. In many cases, temperature and humidity are compensated for by temperature alone and humidity by humidity alone, respectively, and with these individual compensations alone, the drying speed cannot be stabilized and the drying efficiency may be affected. This may cause a decrease in grain quality and a decrease in grain quality.

Therefore, the present invention attempts to solve the above-mentioned problems by controlling the temperature and humidity in relation to each other.

Means for Solving the Problems This invention corrects the dry hot air temperature (b) based on the relative humidity of the outside air (a), and the amount of correction (b) of the hot air temperature (b) is adjusted based on the level of the outside air temperature (c). ) to reduce fluctuations in hot air relative humidity (E).
(b) The grain drying control system is configured to have the following characteristics.

Functions and Effects of the Invention When grains are dried in a grain dryer, for example, hot air is generated using a burner, a fan, etc., and the hot air is blown onto the grains to warm them and soften the moisture. However, since the hot air that dries the grain moisture is drawn from outside air, the hot air relative humidity (e) fluctuates depending on changes in the outside air relative humidity (a), so the hot air temperature changes accordingly. It goes without saying that the drying rate will not be constant unless (b) is corrected to reduce the fluctuations, but at the same time the hot air relative humidity (e) will be affected by changes in the outside air temperature (c), and the outside air relative humidity ( As shown in Figure 3, the fluctuations in the hot air relative humidity (E) in response to changes in the outside air relative humidity (E) become larger as the outside air temperature (C) increases, as shown in Figure 3, than in the case of fluctuations due only to the outside air relative humidity (A). The higher the temperature (c) is, the larger the correction amount (d) is for the hot air temperature (b), and conversely the outside air temperature (
When c) becomes low, the drying speed can be kept almost constant by reducing the correction amount (d) to reduce fluctuations in the hot air relative humidity (e), thereby preventing a drop in drying efficiency and Deterioration in grain quality, such as shell cracking, can also be prevented as much as possible.

Embodiment In the illustrated example, the left and right side walls (2) of the dryer main body (1)
(3) A grain hoist (4) for transferring and circulating grains along the outside of the side wall (2) from the lower end to the upper end of the body (1)
A burner device (5) is installed at the bottom of the side wall (2).
A fan device (6) is provided at the bottom of the side wall (3), and a control device (7) for controlling the drying operation and a control device (7) for detecting grain moisture are provided at the top of the burner device (5). A grain moisture meter (8) is provided adjacent to the control device (7).
are an outside air humidity sensor (9) for detecting the outside air relative humidity (a), an outside air temperature sensor (10) for sensing the outside air temperature (c), and a hot air temperature (b) and a hot air temperature (b) from the outside air temperature. A hot air temperature sensor (11) for detecting the heating amount (f) obtained by subtracting the temperature (c) is provided.

The grains are dried by hot air from the burner device (5) and fan device (6) while flowing down from the upper end of the dryer main body (1), and when the grains reach the lower end of the dryer main body (1), The cycle of transporting the grains to the upper end by the hoisting machine (4) is repeated again. In the drying step (1), this hot air that dries the grain moisture is drawn in outside air, so the outside air relative humidity (a) The hot air relative humidity (E) fluctuates under the influence of The outside air relative humidity (a) detected by the air humidity sensor (9) and the outside air temperature sensor (10)
) is calculated by the control device (7) in relation to the outside air temperature (/\) detected by the hot air temperature sensor (11), and based on the calculated value, the hot air temperature (b) and the heating amount ( By increasing the correction amount (d) of (f) as the outside air temperature (c) increases and decreasing it as the outside air temperature (c) decreases, it is possible to reduce fluctuations in the hot air relative humidity (e), thereby increasing the drying speed. can be made almost constant, thereby preventing a decrease in drying efficiency and also preventing a decrease in grain quality, such as the occurrence of shell cracking, as much as possible.

The specific numerical examples shown in Figure 3 are as follows:
The change in hot air relative humidity (e) with respect to changes in outside air temperature (c) and outside air relative humidity (a) when hot air temperature (b) and heating amount (f) are constant at 20 degrees is shown in the psychrometric diagram ( 80m
Figure). In addition, the state of the correction amount (d) for hot air temperature (b) and heating amount (f) in this case is shown in Figure 4, which is the correction amount (d) for hot air temperature (b) and heating amount (f). In a chart with d) on the vertical axis and outside air relative humidity (a) on the horizontal axis, the tendency of changes in the correction amount (d) due to high (a) and low (b) outside air temperature (c) is expressed by a line diagram. It is something that

On the other hand, the hot air relative humidity (e) is also affected by the hot air temperature (b) and the amount of heating (f), but in the case of the outside air temperature (c), the higher the temperature, the more it responds to changes in the outside air relative humidity (a). The fluctuation in hot air relative humidity (e) increases, but in the case of hot air temperature (b) and heating amount (e), on the contrary, the smaller the amount of heating (e), the more the hot air relative humidity changes with respect to changes in outside air relative humidity (a). The fluctuation in (e) increases as shown in the chart of FIG. In this case, the state of change in the correction amount depending on whether the hot air temperature (b) and the heating amount (f) are large (e) or small (d) tends to be as shown in the chart of FIG.

[Brief explanation of the drawing]

The figures show an embodiment of this invention. 2 Figure 1 is a side view;
Figure 2 is a block diagram of a part of the control circuit, Figure 3 is a numerical table, and Figures 4 to 6 are graphs. In the figure, symbol (a) shows the outside air relative humidity, (b) shows the dry hot air temperature, (c) shows the outside air temperature, (d) shows the correction amount of the hot air temperature (b), and (e) shows the hot air relative humidity.

Claims (1)

[Claims] In a device that corrects the dry hot air temperature (b) using the outside air relative humidity (a), the hot air relative humidity (e) can be adjusted by increasing or decreasing the correction amount (d) of the hot air temperature (b) depending on the height of the outside air temperature (c). A grain drying control method characterized by setting the hot air temperature (b) to reduce fluctuations.