JPS6235032B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a combustion control method for a burner that supplies drying hot air when drying grains such as paddy and wheat.

(Problems to be solved by the prior art and the invention) When drying grains using hot air from a burner, the drying time is faster when the air is low in humidity and dry than when it is humid, even though the temperature of the hot air is the same. . However, if the drying time is too fast, the grains will crack, and if the drying time is too slow, the throughput of the dryer will be reduced.

However, in the past, the combustion of the burner was controlled regardless of the humidity of the atmosphere, which resulted in the drawback that proper drying could not be achieved.

The object of the present invention is to control the temperature of the hot air from the burner according to the humidity of the atmosphere, and to always dry at the same optimum speed.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a fuel flow rate regulating means for the burner of a grain dryer on the output side of the computer, and a humidity sensor on the input side of the computer. When the atmospheric humidity is between the upper limit value and the lower limit value, the flow rate of the fuel flow rate adjusting means is set to the standard value, and when the humidity exceeds the upper limit value, the flow rate of the fuel flow rate adjusting means is set to the standard value. The fuel flow rate adjustment means is characterized in that the flow rate of the fuel flow rate adjusting means is decreased from the standard value when the fuel flow rate is increased from the standard value and is below the lower limit value.

(Example) An example of the present invention will be explained with reference to the drawings.
is a grain dryer, and a drying chamber k2 is formed on the left and right sides of a hot air chamber k1 in the center, into which the grains flow down, and an air exhaust chamber k3 is formed outside of the drying chamber k2. The boundaries between the drying chamber k2, the hot air chamber k1, and the exhaust chamber k3 are separated by a perforated plate. B is a burner connected to the hot air chamber k1, and the hot air is sucked by a suction fan F connected to the exhaust chamber k3. The hot air traverses the drying chamber k2 from the hot air chamber k1, dries the grains, and then is discharged from the exhaust chamber.

A pump P communicating with a fuel tank N is connected to a solenoid valve V.
Connect to burner B via the pipe. M is suction fan F
The motor for driving the elevator (not shown) of the dryer K and the like is shown.

A humidity sensor H is attached to the outer wall of the dryer K, connected to the input side of the computer C, and a solenoid valve V is connected to the output side thereof. As the sensor H, a known electrical industrial instrument such as an electric resistance type or a dry/wet bulb electric type is used. Note that an AD converter (not shown) is interposed between the input/output devices of the sensor H and the valve V and the computer C.

Then, the computer C determines whether the output voltage of the humidity sensor H exceeds a voltage value corresponding to the upper limit value fa (for example, 85%) of humidity. It opens more than the predetermined standard opening degree, increases the amount of fuel sent, and makes the combustion temperature of burner B 2 degrees higher than the standard value.

Furthermore, when the output of the humidity sensor H is less than the upper limit value fa, it is determined in the same way whether it is larger than the lower limit value fb (for example, 60%), and as a result, if it is larger than fb, that is, the humidity In the case between 2 and 3, the valve V is left at the predetermined standard opening and the combustion temperature is set to the standard value.

Furthermore, if the output of the humidity sensor H is smaller than the lower limit value fb, the valve V is closed from the standard opening degree to reduce the amount of fuel fed and the combustion temperature to be lowered by 2 degrees below the standard value.

Incidentally, in order to adjust the combustion temperature, the same effect can be obtained by using a variable flow rate pump as the fuel flow rate adjusting means instead of the solenoid valve V to change the fuel flow rate to the burner B.

(Effects of the Invention) As described above, in the present invention, the supplied fuel is adjusted by the fuel flow rate adjustment means according to the humidity of the atmosphere,
When the atmospheric humidity is between the upper limit value fa and the lower limit value fb, the combustion temperature of the burner is set to a predetermined standard value, and when it exceeds the upper limit value fa, it is set several degrees higher than the standard value, and then set to the lower limit value fb. If the moisture content is lower than 100%, the temperature is lowered by several degrees, so the time required to finish the grains to the specified moisture content remains almost constant regardless of atmospheric humidity, and the dryer K's processing capacity is maximized efficiently. Moreover, the effect is that the grains can be dried at an optimum speed without the risk of causing shelling.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a grain dryer embodying the present invention, and FIG. 2 is a flowchart thereof. K is the grain dryer, B is the burner, V is the solenoid valve, C
is a calculator and H is a humidity sensor.

Claims (1)

[Claims] 1. A fuel flow rate adjustment means provided in burner B of grain dryer K is connected to the output side of computer C, and a humidity sensor H is connected to its input side, so that the atmospheric humidity is between the upper limit value fa and the lower limit value fb. In this case, the flow rate of the fuel flow rate adjusting means is set to the standard value, and when the humidity exceeds the upper limit value fa, the flow rate of the fuel flow rate adjusting means is increased from the standard value, and when the humidity is below the lower limit value fb, the flow rate of the fuel flow rate adjusting means is set to the standard value. A method for controlling combustion of a burner in a grain dryer, characterized in that the flow rate of the fuel flow rate adjusting means is reduced from a standard value.