JPH0313864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling humidity in a seaweed drying room.

[Conventional technology]

Drying of seaweed is carried out by attaching the seaweed to a cage and transporting it along a conveyor path provided in a drying chamber. In order to prevent this, it is necessary to keep the drying room at an appropriate humidity.
As described in Japanese Patent Publication No. 53195, most of them were equipped with a suitable steam generation source to humidify the air.

[Problem that the invention seeks to solve]

However, the humidity retention method in the above conventional example is
The above generation source is always required, and furthermore, it is difficult to humidify the air and keep the humidity at a nearly constant value by generating steam appropriately, resulting in partially over-dried or under-dried seaweed. There was a problem that there were cases.

If this is not properly controlled, the moisture that has not completely evaporated into the air may be blown away by the wind and adhere to the dried seaweed, causing water to partially adhere to the seaweed. In some cases, and
When drying seaweed in a drying room, it is preferable to control the humidity by changing the humidity to an appropriate value depending on the drying state, but in the past, this operation was done manually, which was time-consuming. However, there was a problem in that it needed to be carried out by a highly skilled worker.

Furthermore, the relative hygrometers currently produced have poor accuracy and are inconvenient to handle.
Another problem was that it was not suitable for measurements in places with relatively high humidity and temperature, such as a drying room for seaweed, etc., as it often failed.

The present invention was made in view of these circumstances, and allows the nori drying room to be divided into the front and rear parts and controlled independently without using a relative hygrometer. This invention provides a method of controlling a seaweed drying room to maintain constant humidity.

[Means to solve problems]

A method of controlling a seaweed drying chamber according to the present invention in accordance with the above object is to guide the paper-bound seaweed conveyed on a conveyor into the drying chamber, and to conduct heat exchange chambers disposed in parallel to the drying chamber at the front and rear parts. A control method for a seaweed drying room that is dried using supplied air, in which an absolute hygrometer and a thermometer are installed near the air intakes at the front and rear of the drying room, respectively, and the output value of the absolute hygrometer is Calculate the relative humidity from the output value of the thermometer and compare it with the standard value, and if there is a difference, control the burner in the front or rear heat exchange room to control the temperature of the air supplied to the drying room. In this way, the relative humidity is kept constant.

Here, it is preferable to adopt a burner that controls the temperature of the pipe in the heat exchange chamber by turning it on and off, and controls the temperature of the air supplied to the drying chamber, but the present invention is directed to this. The invention is not limited to this, and can also be applied to the case where the amount of fuel supplied to the burner is controlled and the air sent to the drying chamber is controlled.

[Effect]

The control method for a seaweed drying room according to the present invention detects the relative humidity by detecting the temperature and absolute humidity of the gas, and compares this relative humidity value with a reference value, so it is independent of the temperature or humidity conditions. It is possible to reliably measure the humidity in the drying room and compare it with the standard value.

Since the burner in the heat exchange room is controlled by this output value, the temperature of the air supplied to the seaweed drying room can be changed, so even if the absolute humidity value is constant, , it becomes possible to change the value of relative humidity.

Furthermore, since the drying chamber is divided into the front and rear sections and controlled independently, it is possible to control the drying state of the transported seaweed.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a plan view of a seaweed drying apparatus to which the method of controlling a seaweed drying chamber according to the present invention is applied, FIG. 2 is a sectional view taken along arrow A-A in FIG. 1, and FIG. 3 is a control method thereof. FIG.

As shown in FIGS. 1 and 2, the seaweed drying apparatus to which the above embodiment is applied includes a drying chamber 10 and a drying chamber 1.
The drying chamber 10 includes a heat exchange chamber 11 that is continuous with the drying chamber 10, sensors 12 and 13 equipped with a general hygrometer and a thermometer arranged in the drying chamber 10, and a control device 14 for these sensors. These will be explained in detail below.

The drying chamber 10 is configured such that the seaweed 16 enters onto the conveyor 15 from the upper part of the entrance 17, makes a U-turn at the rear end of the drying chamber 10, and is carried out from the lower part of the entrance 17.

Sensors 1 are installed at the front and rear of the drying chamber 10.
2, 13 are arranged, but the sensor 12,
13 has an absolute hygrometer and a thermometer placed side by side inside each, and their outputs are connected to a control device 14.

On the other hand, a heat exchange chamber 11 connected to the drying chamber 10 has pots 18 and 19 made of large diameter metal tubes for heat exchange inside, and burners 20 and 21 are attached to their respective ends. A fan 22 is attached above the pots 18 and 19, respectively, so that air is blown onto the pots 18 and 19 from above and guided into the drying chamber 10. Note that the upper part of the fan 22 is opened to the drying chamber 10 and the outside air, and a mixture of these air is sent. Here, it is free to attach a damper for adjusting the air volume to these introduction parts, and thereby it becomes possible to control the drying state even more excellently.

The output of the sensor 12 (the same applies to the sensor 13) is digitally processed and correlated with data 23, and a calculation circuit 24 calculates the relative humidity. This value is then added to the indicator 2 along with the temperature value.
5 and is compared with the reference value set by the reference value setting circuit 26 in the comparison circuit 27, and if the reference value is larger, the burner 20 is stopped and the temperature of the pot 18 is lowered. This lowers the temperature of the air blown by the fan 22, thereby reducing the saturated vapor pressure and, as a result, increasing the relative humidity closer to the reference value.

By performing such an operation, the relative humidity of the blown air increases, but when it exceeds the reference value, the comparator circuit 27 operates to raise the temperature of the pot 18, which has lit the burner again. I will let you do it. When the temperature of the oven 18 increases, the temperature of the air fed into the drying chamber 10 increases, and the relative humidity decreases and approaches the reference value.

By repeating the above steps, the relative humidity of the air blown into the drying chamber 10 is always kept constant. Therefore, this allows the dried state of the seaweed to be kept constant at all times and provides an extremely dry state.

In the upper air embodiment, control was explained for the front part of the drying chamber 10 (the left side in the drawing of FIG. 1), but the control for the part at the rear of the drying chamber 10 (the right side in the drawing of FIG. 1) was explained. Since the portion of the drying area is also controlled in the same way, it is possible to control the humidity to suit the drying state of the seaweed, which varies depending on the location.

Further, in the above embodiment, the operation is automatic, but as a modification of the present invention, a hygrometer can be placed at the operator's hand, and the operator can control the burner to adjust the humidity.

[Effects of the Invention] As is clear from the above explanation, the method of controlling a seaweed drying room according to the present invention is not performed by humidifying the air, but by controlling the temperature of the seaweed drying room. Since this is carried out by changing the drying temperature, no water or moisture spots are produced in the drying air, and therefore the seaweed can be dried under uniform conditions.

Since the control is carried out independently at the front and rear parts of the drying chamber, it is possible to always perform optimal control according to the drying state.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a seaweed drying apparatus to which the method of controlling a seaweed drying chamber according to the present invention is applied, FIG. 2 is a sectional view taken along arrow A-A in FIG. 1, and FIG. 3 is a block diagram showing the control method. It is a diagram. [Explanation of symbols], 10...Drying room, 11...Heat exchange room, 12, 13...Sensor (hygrometer, thermometer), 14...Control device, 15...Conveyor, 1
6...Shogi nori, 17...Entrance, 18, 19...
Pot, 20, 21...burner, 22...fan, 2
3...Data, 24...Calculation circuit, 25...Indicator.

Claims (1)

[Claims] 1. The paper-bound seaweed transported on a conveyor is guided into a drying chamber and dried by air supplied from front and rear heat exchange chambers arranged in parallel to the drying chamber. A control method for a seaweed drying room, in which an absolute hygrometer and a thermometer are installed near the air intake at the front and rear of the drying room, respectively, and the relative humidity is determined from the output values of the absolute hygrometer and the thermometer. Calculate and compare with the standard value, and if there is a difference, control the burner in the front or rear heat exchange chamber to control the temperature of the air supplied to the drying chamber to keep the relative humidity constant. A method of controlling a seaweed drying room, characterized in that: 2. The method of controlling a seaweed drying chamber according to claim 1, wherein the temperature of the pipe in the heat exchange chamber is controlled by turning the burner on and off, thereby controlling the temperature of the air supplied to the drying chamber.