JP6429487B2 - Drying apparatus, drying apparatus control method, and control apparatus therefor - Google Patents

Description

  The present invention relates to a drying apparatus for drying and removing moisture / solvent contained in an object to be dried by bringing gas into contact with the object to be dried, water droplets / solvent attached to the object to be dried, a method for controlling the drying apparatus, And a control device thereof.

  In order to reduce the moisture content of food or the like, or to dry the industrial product after a washing step with a solvent or pure water, hot air drying is generally employed. Hot air drying is a method in which a material to be dried is placed in a drying chamber, and high-temperature air is blown onto the material to be dried so that moisture and solvent are evaporated and scattered by the heat of the air.

  In such hot air drying, when a long resin or paper processed into a sheet shape or a tube shape is dried, an apparatus is used that dries while the object to be dried is running inside the drying apparatus. For example, there is a drying apparatus in which a long object to be dried placed on a conveying means is continuously run in a plurality of drying chambers and hot air is passed in a direction opposite to the traveling direction of the object to be dried. In a drying apparatus having a plurality of drying chambers, a device has been devised in which a hot air supply pipe and a discharge pipe are provided in each of the drying chambers so that a large amount of hot air is applied to an object to be dried to improve drying efficiency.

JP-A-10-337520

  In order to further improve the drying efficiency in the hot air drying, it is effective to increase the speed of the hot air supplied to the material to be dried or to reduce the humidity of the hot air. When reducing the humidity of hot air, there are a method of heating the air and a method of dehumidifying the air. However, when a plurality of drying chambers are provided, it is necessary to provide a blowing means, a hot air heating means, or a hot air dehumidifying means for increasing the speed of hot air in each drying room. In addition, each of these means provided in each drying chamber is operated in the same manner, increasing the operating cost. Therefore, there has been a demand for an economical drying apparatus that saves energy.

  The present invention has been proposed to solve the above problems. An object of the present invention is to provide a drying apparatus, a drying apparatus control method, and a drying apparatus control apparatus with improved energy saving.

  The drying apparatus of the present invention has the following configuration.

(1) A plurality of drying chambers in which an object to be dried is dried by blowing are provided, and each of the plurality of drying chambers has a gas amount adjusting means for adjusting a gas amount introduced into the drying chamber, and the gas amount adjustment. Heating means for heating the gas introduced by the means, and the plurality of drying chambers are configured such that the gas discharged from the drying chamber on the upstream side of the gas is sequentially introduced into the drying chamber on the downstream side of the gas. A plurality of drying chambers, and a conveying means for conveying an object to be dried from a drying chamber on the most downstream side of the gas toward a drying chamber on the most upstream side of the gas, and among the plurality of drying chambers The drying chamber on the most upstream side of the gas is connected to an outside air amount adjusting means for adjusting the amount of outside air to be introduced, and among the plurality of drying chambers, on the discharge side of the drying chamber on the most downstream side of the gas A humidity sensor for measuring the relative humidity of the gas, It means the relative humidity measured by the humidity sensor is characterized that you introduce outside air to a predetermined value.

  (2) Among the plurality of drying chambers, a humidity sensor that measures the relative humidity of the gas is provided on the discharge side of the drying chamber on the most downstream side of the gas, and is connected to the drying chamber on the most upstream side of the gas. The outside air amount adjusting means may be configured to introduce outside air so that the relative humidity measured by the humidity sensor becomes a predetermined value.

(3) A temperature sensor for measuring the temperature of the gas is provided in each of the plurality of drying chambers,
The heating means connected to each of the plurality of drying chambers may be configured to heat the gas so that the temperature measured by the temperature sensor of each drying chamber becomes a predetermined value.

  (4) The temperature sensors may be provided on the discharge sides of the plurality of drying chambers.

  (5) The temperature of the predetermined value is set so that the temperature of the drying chamber on the most downstream side of the gas is set highest and gradually becomes lower as the drying chamber on the upstream side of the gas is reached. May be.

  (6) You may have the circulation duct which introduces at least one part of the gas discharged | emitted from the said drying chamber into the said drying chamber again.

  (7) Each of the plurality of drying chambers is further provided with an indoor pressure adjusting means, and the plurality of drying chambers are configured such that the pressure in the drying chamber on the upstream side of the gas is equal to the drying chamber on the downstream side of the gas. The pressure in the drying chamber on the most downstream side of the gas may be adjusted to be higher than the pressure outside the drying apparatus.

  In addition, each said form can also be caught as invention of the control method of a drying apparatus, and the control apparatus of a drying apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the drying apparatus which improved energy saving property, the control method of a drying apparatus, and the control apparatus of a drying apparatus can be provided.

It is a block diagram which shows an example of the drying apparatus concerning the 1st Embodiment of this invention. It is a block diagram which shows an example of the control apparatus of the drying apparatus concerning the 1st Embodiment of this invention. It is a flowchart which shows the control flow concerning the 1st Embodiment of this invention. It is a block diagram which shows the state of the gas in the principal part of the conventional drying apparatus. It is a block diagram which shows the state of the gas in the principal part of the drying apparatus concerning the 1st Embodiment of this invention, and shows the example which installed the temperature sensor in the downstream of a heating means. It is explanatory drawing which shows the state of the gas for calculating the annual energy of the conventional drying apparatus. It is explanatory drawing which shows the state of the gas for calculating the annual energy of the drying apparatus concerning the 1st Embodiment of this invention, and shows the example which installed the temperature sensor in the downstream of a heating means. It is a block diagram which shows the state of the gas in the principal part of the drying apparatus concerning the 2nd Embodiment of this invention, and shows the example which installed the temperature sensor in the discharge side of a drying chamber. It is explanatory drawing which shows the state of the gas for calculating the annual energy of the drying apparatus concerning the 2nd Embodiment of this invention, and shows the example which installed the temperature sensor in the discharge side of a drying chamber. It is a block diagram which shows the state of the gas in the principal part of the drying apparatus concerning the 3rd Embodiment of this invention, and shows the example which installed the temperature sensor in the downstream of a heating means. It is a block diagram which shows the state of the gas in the principal part of the drying apparatus concerning the 3rd Embodiment of this invention, and shows the example which installed the temperature sensor in the discharge side of a drying chamber. It is explanatory drawing which graphed the concept of the drying aspect of to-be-dried material. It is explanatory drawing which shows the state of the gas for calculating the annual energy of the drying apparatus concerning the 3rd Embodiment of this invention, and shows the example which installed the temperature sensor in the downstream of a heating means. It is explanatory drawing which shows the state of the gas for calculating the annual energy of the drying apparatus concerning the 3rd Embodiment of this invention, and shows the example which installed the temperature sensor in the discharge side of a drying chamber.

[First Embodiment]
[1. Constitution]
[1.1 General configuration of drying apparatus]
Hereinafter, an embodiment of a drying apparatus according to the present invention will be described with reference to FIG. In the following description, the side where the outside air is introduced into the drying device X is expressed as the upstream side of the gas, and the side where the gas is discharged from the drying device X is expressed as the downstream side of the gas. The drying apparatus X includes a plurality of drying chambers 1a to 1c in which an object to be dried D is dried by blowing air. In the present embodiment, the number of drying chambers is three, but it is sufficient if there are two or more.

  In each of the plurality of drying chambers 1a to 1c, gas amount adjusting means 2a to 2c for adjusting the amount of gas introduced into the drying chambers 1a to 1c, and heating means for heating the gas introduced by the gas amount adjusting means 2a to 2c 3a-3c are connected. The plurality of drying chambers 1a to 1c are configured such that the gas discharged from the drying chamber on the upstream side of the gas is sequentially introduced into the drying chamber on the downstream side of the gas. In addition, the drying apparatus X includes a conveying unit C that conveys an object to be dried D from the drying chamber 1c on the most downstream side of the gas toward the drying chamber 1a on the most upstream side of the gas in the plurality of drying chambers 1a to 1c. Prepare.

  In addition, as the to-be-dried object D in this embodiment, for example, a long resin or paper processed into a sheet shape or a tubular shape can be considered. However, the drying apparatus X is for drying moisture and / or solvent contained in the object and moisture and / or solvent adhering to the object, and the object to be dried is not limited to these.

  The drying apparatus X is used, for example, when the object to be dried D is a food, to reduce the water content contained in the food. For example, when the to-be-dried object D is an industrial product, it is used for drying an industrial product washed with a solvent or pure water. That is, in the following, an example of drying the moisture of the material to be dried D will be described, but the embodiment includes a mode of drying the solvent of the material to be dried D.

[1.2 Configuration of drying apparatus]
The plurality of drying chambers 1a and 1b of the drying apparatus X are provided so as to be adjacent to each other through a communication port. Similarly, the drying chambers 1b and 1c are provided so as to be adjacent to each other through a communication port. On the one side surface of the drying chamber 1a that is the most upstream side of the gas in the drying apparatus X, a carry-out port O for an object to be dried D is provided. Moreover, the inlet I of the to-be-dried object D is provided in one side surface of the drying chamber 1c used as the most downstream side of gas.

  A conveying means C is provided through the carry-in inlet I and the carry-out outlet O to pass and carry the object D to be dried. That is, the conveying means C conveys the material D to be dried from the drying chamber 1c on the most downstream side of the gas to the drying chamber 1a on the most upstream side of the gas via the drying chamber 1b. As the transport means C, for example, a transport device such as a belt conveyor can be used. Further, when drying the sheet-like material D, the sheet wound around the core material is sent out from the carry-in entrance I so as to travel between the drying chambers 1a to 1c, and the sheet is cored at the carry-out exit O. It is good also as a conveyance apparatus wound up on material. That is, any apparatus may be used as long as it can continuously convey the material to be dried D in the drying chambers 1a to 1c.

  The drying chambers 1a to 1c are provided with an air supply port and an exhaust port, respectively. The duct having one end connected to the air supply port of the drying chamber 1 a is an air supply duct 4 a that supplies heated gas to the drying chamber 1. The other end of the air supply duct 4a communicates with the outside of the drying device X and serves as an outside air introduction port. On the outside air inlet side of the air supply duct 4a, outside air amount adjusting means A1 for adjusting the amount of outside air introduced into the drying device X is provided. The outside air amount adjusting means A1 includes an introduction damper A1a for introducing gas into the drying device X and a blower A1b.

  The introduction damper A1a is a motor damper that adjusts the amount of outside air introduced into the air supply duct 4a by changing the degree of opening and closing. The blower A1b is a fan that flows the introduced outside air in the direction of the drying chamber 1a. Note that the gas to be introduced may not be outside air as long as it is a gas that dries the moisture and / or solvent of the object to be dried.

  A gas amount adjusting means 2a for adjusting the amount of gas introduced into the drying chamber 1a and a heating means 3a for heating the gas introduced by the gas amount adjusting means 2a are connected to the downstream side of the outside air both adjusting means A1. One end of an air supply duct 4b that supplies heated gas to the drying chamber 1b is connected to the exhaust port of the drying chamber 1a. The air supply duct 4b is provided with a gas amount adjusting means 2b and a heating means 3b. The other end of the air supply duct 4b is connected to the air supply port of the drying chamber 1b. With this configuration, the gas discharged from the drying chamber 1a on the upstream side of the gas is introduced into the drying chamber 1b on the downstream side of the gas via the gas amount adjusting means 2b and the heating means 3b. Become.

  One end of an air supply duct 4c that supplies heated gas to the drying chamber 1c is connected to the exhaust port of the drying chamber 1b. The air supply duct 4c is provided with a gas amount adjusting means 2c and a heating means 3c. The other end of the air supply duct 4c is connected to the air supply port of the drying chamber 1c. With this configuration, the gas discharged from the drying chamber 1b on the upstream side of the gas is introduced into the drying chamber 1c on the downstream side of the gas via the gas amount adjusting unit 2c and the heating unit 3c. Become.

  As the gas amount adjusting means 2a to 2c, a blower that introduces gas into each of the drying chambers 1a to 1c can be used. The blower is configured to flow gas in the direction of the heating means 3a to 3c. Moreover, you may control the quantity of the gas introduce | transduced into each drying chamber 1a-1c by controlling the rotation speed of an air blower. The outside air amount adjusting unit A1 and the gas amount adjusting units 2a to 2c are connected to a gas amount adjusting unit driving unit 21 of the control device Y described later.

  The heating means 3a to 3c are for heating the introduced gas to a predetermined temperature, and for example, a heating apparatus such as a steam type or an electric type can be used. In addition, the heating parts 3a-3c are connected to the heating means drive part 31 of the control apparatus Y mentioned later.

  An exhaust duct 4d for discharging the gas in the drying chamber 1c is connected to the exhaust port of the drying chamber 1c. The other end of the exhaust duct 4d communicates with the outside of the drying device X and serves as a gas outlet. The exhaust duct 4d is provided with an exhaust amount adjusting means A2. The exhaust amount adjusting means A2 includes a discharge damper A2a and a blower A2b.

  The discharge damper A2a is a motor damper that adjusts the amount of gas discharged from the drying chamber 1c so as to match the amount of outside air introduced into the drying apparatus X by changing the degree of opening and closing. The blower A2b is a fan that causes the gas discharged from the drying chamber 1c to flow outward from the drying device X. If the amount of gas discharged can be controlled by controlling the air volume of the blower A2b, the discharge damper A2a is not necessarily provided. The gas amount adjusting means A2 is connected to a gas amount adjusting means driving unit 21 of the control device Y described later.

  The ducts indicated by dotted lines in FIG. 1 are circulation ducts 5a to 5c for returning a part of the gas discharged from the drying chambers 1a to 1c to the respective drying chambers 1a to 1c. Specifically, the circulation duct 5a is connected to the air supply duct 4a on the downstream side of the outside air amount adjusting means A1, and is configured to return a part of the gas discharged from the drying chamber 1a to the drying chamber 1a. ing. The circulation ducts 5b and 5c are also connected to the air supply ducts 4b and 4c, respectively, and are configured to return part of the gas discharged from the drying chambers 1b and 1c to the drying chambers 1b and 1c, respectively.

  The circulation ducts 5a to 5c are provided with dampers 6a to 6c, respectively. The damper 6a-6c adjusts the difference in the indoor pressure of the drying chambers 1a-1c by controlling the degree of opening and closing. For example, in a state where the gas amount introduced into the drying chamber 1a by the gas amount adjusting means 2a is constant, the opening / closing degree of the damper 6a is adjusted, and the damper 6a is slightly closed. If it does so, it will become difficult to discharge | emit the gas introduced into the drying chamber 1a, As a result, the indoor pressure of the drying chamber 1a will become a positive pressure.

  Similarly, by adjusting the opening / closing degree of the dampers 6b and 6c, the indoor pressure of the drying chambers 1b and 1c becomes positive. Moreover, it is preferable that the indoor pressure of the drying chamber 1a which becomes the upstream side of the gas is adjusted to be higher than the indoor pressure of the drying chamber 1b which becomes the downstream side of the gas. Similarly, it is preferable that the indoor pressure of the drying chamber 1b on the upstream side of the gas is adjusted to be equal to or higher than the indoor pressure of the drying chamber 1c on the downstream side of the gas. The damper 6a may be adjusted so that the pressure in the drying chamber 1c on the most downstream side of the gas is higher than the pressure outside the drying device X.

  A humidity sensor H that measures the relative humidity of the gas is provided on the discharge side of the drying chamber 1c on the most downstream side of the gas. The humidity sensor H is connected to a gas amount control unit 200 of the control device Y described later. The humidity sensor H may be configured to measure absolute humidity and temperature and convert it to relative humidity. Moreover, it is good also as a structure which calculates | requires the moisture content of the to-be-dried material D instead of measuring a relative humidity. In the present embodiment, for convenience of explanation, the humidity sensor H will be described as measuring relative humidity and the removal target as moisture.

  Moreover, the temperature sensor T which measures the temperature of the gas which passed the heating means 3a-3c is provided in the downstream of the heating means 3a-3c. The temperature sensor T is connected to a heating temperature control unit 300 of a control device described later. The temperature sensor T may be configured to measure the temperature in the drying chambers 1a to 1c. Moreover, it can also be set as the structure which measures the temperature of to-be-dried material D itself with a thermography etc.

[1.3 Configuration of control device]
As shown in FIG. 2, the control device Y is connected to the temperature sensor T and the humidity sensor H of the drying device X. The control device Y can control the operation of the drying device X based on the values of these sensors. Specifically, the control device Y is configured by a computer or a dedicated electronic circuit that includes a CPU and a memory and is operated by a predetermined program, to which the input unit 101 and the output unit 102 are connected. The control device Y includes a gas amount control unit 200, a heating temperature control unit 300, a gas amount adjustment unit driving unit 21, and a heating unit driving unit 31.

  Connected to the gas amount control unit 200 is a gas amount adjustment unit drive unit 21 that drives the outside air amount adjustment unit A1, the gas amount adjustment units 2a to 2c, and the exhaust amount adjustment unit A2 in accordance with a control signal from the gas amount control unit 200. Has been. In addition, the heating temperature controller 300 is connected to a heating device driver 31 that drives the heating devices 3 a to 3 c in accordance with a control signal from the heating temperature controller 300.

  The input unit 101 includes an input device that accepts information input from an operator and an interface that notifies the control device Y of the input information. The input unit 101 is a means for an operator to input an operation request to the drying apparatus X and a change of a set value, for example. As the input device, for example, a touch panel (including one installed on the display device of the output unit 102), a mouse, a keyboard, and the like can be used.

  The output unit 102 includes an interface that outputs information from the control device Y, and a display device that displays a screen that allows the operator to confirm and select operation contents based on the output information. The output unit 102 is means for displaying, for example, a list or a diagram of the state of the drying apparatus X, or displaying an alarm for the operation of the system or the operator. As the display device, for example, a display having a display screen such as a liquid crystal display panel can be used.

[1.3.1 Configuration of Gas Control Unit]
The gas amount control unit 200 is a processing unit that controls the outside air amount adjusting means A1 of the drying device X based on the measurement value of the humidity sensor H. The gas amount control unit 200 includes a set humidity storage unit 201, a humidity comparison unit 202, and a gas amount condition determination unit 203. The gas amount control unit 200 can also control the gas amount adjusting units 2a to 2c and the exhaust amount adjusting unit A2.

  The set humidity storage unit 201 is a unit that stores relative humidity that serves as a reference for controlling the outside air amount adjusting unit A1. Specifically, the set humidity storage unit 201 stores a predetermined relative humidity according to the material to be dried D. That is, the predetermined relative humidity is a relative humidity at which the object to be dried D can be dried to a target degree of drying based on a constant air volume and speed, and is determined by the amount of water removed from the object to be dried D. As the predetermined relative humidity, the relative humidity corresponding to the material to be dried D is stored in the set humidity storage unit 301 in advance.

  The humidity comparison unit 202 is, for example, a processing unit that compares a plurality of numerical values to determine the numerical value magnitude and the numerical value difference. More specifically, the humidity comparison unit 202 compares the measured value of the humidity sensor H converted into a digital signal by an A / D conversion unit (not shown) with the relative humidity value stored in the set humidity storage unit 201, The comparison result is output to the gas amount condition determining unit 203.

  The gas amount condition determination unit 203 is a processing unit that receives the comparison result output from the humidity comparison unit 202 and obtains the gas amount condition of the outside air introduced by the outside air amount adjustment unit A2 based on the comparison result. The gas amount condition determining unit 203 outputs a condition for controlling the outside air amount adjusting unit A2 to the gas amount adjusting unit driving unit 21 so that the relative humidity in the drying chamber 1a becomes the set relative humidity. Similarly, the gas amount condition determining unit 203 determines the conditions for controlling the gas amount adjusting units 2a to 2c and the exhaust amount adjusting unit A2.

[1.3.2 Configuration of heating temperature controller]
The heating temperature control unit 300 is a processing unit that controls the heating units 3 a to 3 c of the drying device X based on the measurement value of the temperature sensor T. Specifically, the heating temperature control unit 300 includes a set temperature storage unit 301, a temperature comparison unit 302, and a heating condition determination unit 303.

  The set temperature storage unit 301 is a unit that stores a temperature that serves as a reference for controlling the heating units 3a to 3c. Specifically, the set temperature storage unit 301 stores a predetermined temperature corresponding to the drying device X and the object to be dried D for each of the heating units 3a to 3c. The predetermined temperature is determined based on the heat resistance temperature of the entire equipment of the drying apparatus X and the heat resistance temperature of the object to be dried D, which are stored in the preset temperature storage unit 301 in advance. For example, if the heat resistance temperature of the drying apparatus X is 200 ° C. and the heat resistance temperature of the object to be dried D is 125 ° C., the predetermined temperature is set so that a gas of less than 125 ° C. hits the object to be dried D. To do.

  As described above, the temperature sensor T is provided on the downstream side of the heating means 3a to 3c. In such a configuration, when the heat resistance temperature of the drying apparatus X is 200 ° C. and the heat resistance temperature of the material to be dried D is 125 ° C., the heating means 3a to 3c are controlled so as to obtain, for example, a gas of 120 ° C. Can do. The predetermined temperature is appropriately determined in consideration of the moisture content of the material D to be dried.

  Further, the predetermined temperature is set so that the temperature of the gas hitting the material to be dried D is lower than the heat-resistant temperature and as high as possible. That is, the predetermined temperature is set to a temperature at which the temperature of the gas that hits the dried material D does not affect the performance and quality of the drying device X and the dried material D, and a high temperature on the heat-resistant temperature side. Specifically, the predetermined temperature should just be set so that the temperature of the gas which hits the to-be-dried object D may be 5-20 degreeC lower than heat-resistant temperature from a viewpoint of a measurement error or a response delay. For example, when the heat-resistant temperature is 125 ° C., it is preferable that the temperature of the gas to be supplied is set so that the temperature of the gas hitting the material to be dried D is 105 to 120 ° C.

  The temperature comparison unit 302 is a processing unit that compares a plurality of numerical values, for example, and determines a numerical value magnitude or a numerical value difference. Specifically, the temperature comparison unit 302 has passed through the measured value of the temperature sensor T converted into a digital signal by an A / D conversion unit (not shown) and the heating means 3 a to 3 c stored in the set temperature storage unit 301. The set temperature of the gas is compared, and the comparison result is output to the heating condition determining unit 303.

  The heating condition determination unit 303 is a processing unit that receives the comparison result output from the temperature comparison unit 302 and obtains the heating condition of the heating units 3a to 3c based on the comparison result. Specifically, the heating condition determination unit 303 sets the heating condition that is the heating temperature of the heating units 3 a to 3 c so that the gas that has passed through the drying chambers 1 a to 1 c becomes the set temperature stored in the set temperature storage unit 201. decide. The determined heating conditions are output to the heating unit control means 31.

[2. Action]
[2.1 Operation of drying equipment]
The operation of the drying apparatus X of the present embodiment having the above configuration will be described below. As shown in FIG. 1, the material to be dried D is transported by the transport device C and introduced into the drying chambers 1 a to 1 c of the drying device X. The drying chambers 1a to 1c dry the conveyed object D to be dried by the heated gas. Here, only operation | movement of the drying apparatus X of this embodiment is demonstrated along a gas flow first.

  The introduction damper A1a of the outside air amount adjusting means A1 is controlled to be in an open state so as to introduce a predetermined amount of outside air. The rotation speed of the blower A1b is controlled so that a predetermined amount of outside air flows to the gas amount adjusting means 2a side. The gas amount adjusting means 2a is operated while maintaining the rotation speed so as to introduce a certain amount of gas into the drying chamber 1a. A circulation duct 5a is connected to the upstream side of the gas amount adjusting means 2a, and a part of the gas discharged from the drying chamber 1a through the circulation duct 5a is introduced into the gas amount adjusting means 2a. In the air supply duct 4a, the gas amount adjusting means 2a causes the introduced outside air and the circulated gas to flow toward the heating means 3a. And the heating means 3a heats gas to predetermined temperature. The air supply duct 4a supplies heated gas from the supply port to the drying chamber 1a.

  Similarly, the gas amount adjusting means 2b is operated while maintaining the rotation speed so as to introduce a certain amount of gas into the drying chamber 1b. In the air supply duct 4b, the gas amount adjusting means 2b causes the gas introduced from the drying chamber 1a side and the gas circulated through the circulation duct 5b to flow to the heating means 3b side. And the heating means 3b heats gas to predetermined temperature. The air supply duct 4b supplies the heated gas from the supply port to the drying chamber 1b.

  The gas amount adjusting means 2c operates in the same manner, introducing the gas in the drying chamber 1b and the circulated gas into the air supply duct 4c, and flowing the gas toward the heating means 3c. The heating means 3c heats the gas to a predetermined temperature, and the heated gas is supplied to the drying chamber 1c from the air supply port via the intake duct 4c.

  In the drying chambers 1a to 1c, a heated gas having a constant air volume is supplied to the material D to be dried. The material to be dried D is dried by the gas thus supplied. The conveying apparatus C conveys the to-be-dried material D dried by passing through the drying chambers 1a to 1c to the outside of the drying apparatus X. As the gas in the drying chambers 1a to 1c is dried, the temperature decreases as the isoenthalpy change and the relative humidity increases. Then, the open state of the introduction damper A1a of the outside air amount adjusting means A1 is controlled, further introducing a gas, and supplying the heated gas to the drying chamber 1a. By this operation, the relative humidity of the gas discharged from the drying chamber 1c is adjusted to be a predetermined relative humidity.

  Further, the gas in the drying chamber 1c is introduced into the exhaust duct 4d through the exhaust port and discharged to the outside of the drying device X. In this case, the amount of exhausted gas is adjusted by the degree of opening and closing of the exhaust duct A2a of the exhaust amount adjusting means A2. The blower A2b is operated with a constant rotation speed, and the gas that has passed through the discharge damper A2a is discharged by the blower A2b flowing to the outside of the drying device X. In the above description of the operation, the heat capacity of the object to be dried D, the temperature change, and the heat balance outside the drying apparatus X are not considered, but in actual operation, the gas amount and the temperature are taken into consideration. Humidity is set.

[2.2 Control flow]
Next, the control flow of the control device Y will be described with reference to FIG. The control device Y controls the gas amount adjusting means 2a so that the measured value of the humidity sensor H becomes a predetermined relative humidity, and controls the heating units 3a to 3c so that the measured value of the temperature sensor T becomes a predetermined temperature. To do.

  Here, the case where the to-be-dried object D whose heat-resistant temperature is 125 degreeC is dried is demonstrated as an example. In this case, for example, in the control device Y, the set humidity storage unit 201 stores a predetermined relative humidity of 4%, and the set temperature storage unit 301 stores a predetermined temperature of 100 ° C.

  When the operation of the drying apparatus X is started, the gas amount control unit 200 controls the introduction damper A1a to be in an open state and introduces, for example, outside air into the air supply duct 4a. This outside air is sent to the drying chamber 1a side through the blower A1b and the gas amount adjusting means 2a. Moreover, the heating temperature control part 300 controls the heating means 3a so that the measured value of the temperature sensor T in the drying chamber 1a becomes a predetermined value of 100 ° C. (step S01).

  Specifically, the measured value detected by the temperature sensor T of the connected drying chamber 1a is transmitted to the temperature comparison unit 302 of the heating temperature control unit 300 (step S02). The temperature comparison unit 302 reads a predetermined set temperature stored in advance in the set temperature storage unit 301, compares it with the measured value of the temperature sensor T, and outputs the comparison result to the heating condition determination unit 303.

  Based on the comparison result, the heating condition determination unit 303 determines a heating condition for controlling the heating unit 3a so that the temperature of the gas that has passed through the heating unit 3a becomes 100 ° C. The heating condition determining unit 303 controls the heating unit 3a by outputting the determined heating condition to the heating unit driving unit 31. Therefore, the heating means 3a heats the introduced gas so that the temperature of the gas that has passed through the heating means 3a becomes 100 ° C.

  The measured value detected by the humidity sensor H of the connected drying chamber 1c is transmitted to the humidity comparison unit 202 of the gas amount control unit 200 (step S02). The humidity comparison unit 202 reads a predetermined humidity stored in advance in the set humidity storage unit 201, compares it with the measured value of the humidity sensor H, and outputs the comparison result to the gas amount condition determination unit 203.

  The gas amount condition determination unit 203 determines the gas amount condition to be introduced so that the relative humidity becomes 4% based on the comparison result. The gas amount condition determining unit 203 outputs the determined gas amount condition to the gas amount adjusting unit driving unit 21 to control the opening / closing degree of the introduction damper A1a. Therefore, the introduction damper A1a introduces the outside air so that the relative humidity of the gas in the drying chamber 1c is 4%.

  For example, if the heating temperature of the heating unit 3a is gradually increased, if the measured value of the temperature sensor T does not reach 100 ° C. (NO in step S03), the heating temperature in the heating unit 3a is increased, Continue heating.

  On the other hand, when the measured value of the temperature sensor T in the drying chamber 1a reaches 100 ° C. (YES in step S03), the heating temperature control unit 300 determines that the temperature of the drying chamber 1b on the downstream side is a predetermined value (100 ° C.). Check if you have reached. When the measured value of the temperature sensor T in the drying chamber 1b does not reach 100 ° C. (NO in step S04), the heating temperature in the heating unit 3b is increased and the gas is continuously heated. The operation of the heating temperature control unit 300 is the same as described above. Moreover, the same process is performed also about the temperature of the drying chamber 1c on the most downstream side.

  On the other hand, when the measured value of the temperature sensor T in the drying chambers 1b and 1c has reached a predetermined temperature (YES in step S04), the gas amount control unit 200 determines whether the measured value of the humidity sensor H has reached 4%. To check. If the measured value of the humidity sensor H does not reach 4% relative humidity (NO in step S05), the introduction of gas and the heating are continued. At this time, until the relative humidity reaches 4%, the gas amount control unit 200 controls the opening amount of the introduction damper A1a to be increased, thereby increasing the amount of outside air to be introduced.

  When the measured value of the humidity sensor H reaches 4% (YES in Step 05), the material to be dried D is conveyed to the drying chambers 1a to 1c, and drying of the material to be dried D is started (Step S06). Then, the relative humidity in the drying chambers 1a to 1c increases as the drying object D progresses. Accordingly, even when the object to be dried D is dried, the heating temperature control unit 300 controls the heating means 3a to 3c so that the measured value of the temperature sensor T becomes 100 ° C., and the gas amount control unit 200 The control of the introduction damper A1a so that the measured value of the humidity sensor H is maintained at 4% (steps S07 to S10) until a desired dry state is achieved in a certain amount of the material to be dried D, that is, , Intermittently until the desired amount of water removal is achieved.

[3. Temperature / humidity setting example]
An example of setting the temperature and humidity in the drying apparatus X of the present embodiment that operates as described above will be described in comparison with a conventional example. FIG. 4 shows the gas state in the main part of a conventional drying apparatus, and FIG. 5 shows the main part of the drying apparatus X when a temperature sensor is installed on the downstream side of the heating means in the drying apparatus X of this embodiment. The gas state in is shown.

  The drying object D is dried using the four drying chambers 1a to 1d. The outside air to be introduced was assumed to have a temperature of 33.9 ° C. and a relative humidity of 60.7%, and the gas state at the maximum load was calculated. In the drying chambers 1a to 1d, the gas amount necessary for drying is set to 33000 kg '/ h, and the setting example of the temperature and humidity for drying the material to be dried D equally in the conventional drying device and the drying device X of the present embodiment Is explained with specific numerical values.

  For simplification of explanation, in FIGS. 4 and 5, reference numerals other than the drying chambers 1 a to 1 d are omitted. 4 and 5, a heat exchanger is provided to exchange the sensible heat of the exhausted gas and the sensible heat of the introduced gas. Thereby, since the sensible heat of the exhausted gas can be used for heating the introduced gas, the energy saving property is improved.

(1) Conventional Drying Device In the conventional drying device shown in FIG. 4, the temperature of the gas supplied to each of the drying chambers 1a to 1d is controlled to be 100 ° C. Further, 11000 kg ′ / h of outside air having an absolute humidity of 20.3 g / kg ′ is introduced into each of the drying chambers 1 a to 1 d. Therefore, a total of 44000 kg ′ / h of outside air is introduced into the drying apparatus as the entire drying apparatus.

  Each of the drying chambers 1a to 1d is independent, and 22,000 kg '/ h of the gas discharged from each of the drying chambers 1a to 1d is circulated to each drying chamber and introduced to 11000 kg' / h of outside air. Mixed and introduced into the heating means. Conventionally, the amount of gas required for drying of 33,000 kg '/ h was obtained in each of the drying chambers 1a to 1d as described above. Further, 11000 kg '/ h of gas that is not circulated to the drying chambers 1a to 1d is discharged from each drying chamber. As described above, conventionally, the amount of outside air introduced into the drying apparatus or the amount of gas discharged from the drying apparatus is 44000 kg '/ h.

(2) Drying apparatus of this embodiment-Example in which a temperature sensor is installed on the downstream side of the heating means In the drying apparatus X of this embodiment shown in FIG. The value of the humidity sensor H is controlled to be 7.9% relative humidity. Moreover, the temperature sensor T is provided in the downstream of each heating means, and the value of each temperature sensor is controlled so that it may respectively become 100 degreeC.

  29410 kg '/ h of outside air having a relative humidity of 60.7% is introduced into the drying chamber 1a from the outside. In the drying chambers 1b to 1d, 29410 kg '/ h of gas discharged from the upstream drying chamber is introduced. Accordingly, the amount of gas circulated to the drying chambers 1a to 1d through the circulation duct is 3590 kg '/ h. Based on the above assumption, the gas conditions in the main part of the drying apparatus X were calculated.

  A gas having a relative humidity of 60.7% and a gas amount of 29410 kg ′ / h introduced from the outside is mixed with a gas having a relative humidity of 3.5% and a gas amount of 3590 kg ′ / h circulated from the drying chamber 1a, and is heated. To be introduced. The gas heated by the heating means becomes a gas having a relative humidity of 3.2% and a gas amount of 33000 kg '/ h, and is introduced into the drying chamber 1a.

  The material D to be dried in the drying chamber 1a has already passed through the drying chambers 1b to 1d and has been dried. That is, the product moisture content is in a state where the target moisture content is almost achieved. In the drying chamber 1a, 25 kg / h of water is removed, and the relative humidity of the gas discharged from the drying chamber 1a is 3.5%. As for the gas discharged | emitted from the drying chamber 1a, 3590 kg '/ h is circulated to the drying chamber 1a, and 29410 kg' / h is introduced into the drying chamber 1b.

  The gas having a relative humidity of 3.5% and a gas amount of 29410 kg ′ / h discharged from the drying chamber 1a is mixed with the gas having a relative humidity of 4.6% and a gas amount of 3590 kg ′ / h discharged from the drying chamber 1b and heated. Introduced into the means. The gas heated by the heating means becomes a gas having a relative humidity of 3.4% and a gas amount of 33000 kg '/ h, and is introduced into the drying chamber 1b. The to-be-dried object D in the drying chamber 1b has a higher water content than the drying chamber 1a. Accordingly, 75 kg / h of moisture is removed in the drying chamber 1b, the humidity of the gas is increased, and a gas having a relative humidity of 4.6% is discharged from the drying chamber 1b.

  The circulation and heating of the gas as described above are also performed in the drying chamber 1c. Since the material to be dried D is introduced from the most downstream side of the gas, the moisture content of the material to be dried D is higher in the downstream drying chamber. Accordingly, 150 kg / h of water is removed in the drying chamber 1 c on the downstream side, and the absolute humidity of the discharged gas gradually increases. A gas having a relative humidity of 6.8% and a gas amount of 29410 kg ′ / h discharged from the drying chamber 1c is mixed with a gas having a relative humidity of 7.9% and a gas amount of 3590 kg ′ / h discharged from the drying chamber 1d. It is heated and becomes a gas having a relative humidity of 4.5% and is introduced into the drying chamber 1d.

  In the drying chamber 1d, 150 kg / h of water is removed, and a gas having a relative humidity of 7.9% is discharged from the drying chamber 1d. Of the gas discharged from the drying chamber 1d, 3590 kg '/ h is circulated to the drying chamber 1d, and a gas of 29410 kg / h is discharged outside the drying apparatus X. From the above, the amount of outside air introduced into the drying apparatus X or discharged from the drying apparatus was 29410 kg '/ h.

  As is clear from FIG. 5, the dryest gas is discharged from the drying chamber 1 a into which the material to be dried D is finally carried. On the other hand, the damp air is discharged from the drying chamber 1d into which the material to be dried D is first carried. Therefore, as described above, the drying chamber 1a into which the material to be dried D is finally carried is the upstream side of the gas, and a gas with less moisture is supplied. And the gas introduce | transduced into the drying apparatus X is utilized effectively by introduce | transducing the gas discharged | emitted from the drying chamber 1a in the drying chamber of the downstream of gas, ie, the dampening chamber of the dampness.

[4. effect]
The effects of the present embodiment as described above are as follows.
(1) The effect of the drying device X of the present embodiment will be described in comparison with a conventional drying device. Annual use of the drying equipment with the same outdoor temperature as the temperature and humidity settings shown in FIGS. 4 and 5 and the outside air to be introduced as outside air at an average annual temperature and humidity (temperature: 16.1 ° C., relative humidity: 76.2%) The amount of energy was calculated. FIG. 6 shows the state of gas in the main part of the conventional drying apparatus when the outside air to be introduced is outside air having an average temperature and humidity of the year, and FIG. 7 shows the outside air to be introduced as outside air having an average temperature and humidity of the year. The state of the gas in the principal part of the drying apparatus X of this embodiment at the time of doing is shown. FIG. 7 shows an example in which a temperature sensor is installed on the downstream side of the heating means.

  In the conventional drying apparatus shown in FIG. 6, when the steam heating means is used, the total temperature heated by each heating means is 82.0 ° C. Accordingly, the amount of energy used annually is 6588600 kWh, and the amount of steam used for heating is 11428 ton / year.

  On the other hand, in the present embodiment shown in FIG. 7, the plurality of drying chambers are configured such that the gas discharged from the drying chamber on the upstream side of the gas is sequentially introduced into the drying chamber on the downstream side of the gas. That is, the gas in the upstream drying chamber having a low relative humidity is introduced into the drying chamber in the downstream having a high relative humidity, and the gas introduced into the drying apparatus X is effectively utilized. Therefore, in the drying apparatus X of the present embodiment shown in FIG. 8, when the steam heating means is used, the total temperature heated by each heating means is 48.3 ° C. Therefore, the annual energy consumption is 3878490 kWh, and the amount of steam used for heating is 6820 ton / year. From the above, the drying device X of the present embodiment can improve energy saving.

(2) In the present embodiment, the humidity sensor H is provided on the discharge side of the drying chamber 1c on the most downstream side of the gas, and the outside air is introduced so that the relative humidity becomes a predetermined value. When the desired humidity is obtained in the gas after passing through all the drying chambers 1a to 1c, it can be estimated that the drying state in the middle is also accurate. Therefore, it is not necessary to provide the humidity sensor H in all the drying chambers 1a to 1c. Moreover, when the humidity of the drying chamber 1c is a predetermined value, the amount of outside air to be introduced can be reduced, so that energy saving can be improved.

(3) In this embodiment, it has the introduction ducts 5a-5c which introduce at least one part of the gas discharged | emitted from the drying chambers 1a-1c into the drying chambers 1a-1c again. By circulating the gas discharged from the drying chambers 1a to 1c, the amount of gas introduced into the drying chambers 1a to 1c can be kept constant without increasing the amount of outside air to be introduced. Therefore, energy saving property can be improved.

(4) In this embodiment, each of the drying chambers 1a to 1c is provided with indoor pressure adjusting means 6a to 6c, and the drying chambers 1a to 1c are configured so that the pressure in the drying chamber on the upstream side of the gas is equal to that of the gas. The pressure in the drying chamber 1c on the most downstream side of the gas is adjusted so as to be equal to or higher than the pressure outside the drying device X. Accordingly, the gas in the downstream drying chamber having a high humidity does not enter the upstream drying chamber having a low humidity via the communication port. Further, the gas outside the drying device X does not enter the drying device X via the carry-out port O of the drying chamber 1a or the carry-in port I of the drying chamber 1c. Therefore, the relative humidity of each of the drying chambers 1a to 1c can be properly maintained, and the energy saving property can be improved.

[Second Embodiment]
[1. Configuration]
The configuration of the drying apparatus X of the second embodiment is basically the same as that of the first embodiment. However, as shown in FIG. 8, a temperature sensor T is provided on the discharge side of each of the drying chambers 1a to 1d. In such a configuration, the heating condition determining unit 303 determines the heating condition for controlling the heating means so that the temperature of the gas that has passed through the drying chambers 1a to 1d becomes 100 ° C. Therefore, a heating means will heat the introduced gas so that the temperature of the gas which passed the drying chambers 1a-1d may be 100 degreeC.

  In the above configuration, when the heat resistance temperature of the drying apparatus X is 200 ° C. and the heat resistance temperature of the material to be dried D is 105 ° C., the heating means can be controlled to obtain, for example, a gas of 111 ° C. . A material to be dried D having a high water content is carried into the drying chamber 1d. Accordingly, the relative humidity in the drying chamber 1d is increased. Even if a gas of 111 ° C. exceeding the heat resistance temperature of the object to be dried D is supplied to the drying chamber 1c, the temperature of the gas that actually hits the object to be dried D becomes less than 105 ° C. due to the heat of vaporization. Note that the temperature for controlling the temperature sensor T is appropriately determined in consideration of the moisture content of the material D to be dried.

[2. Temperature / humidity setting example]
In the drying apparatus X of this embodiment shown in FIG. 8, the value of the humidity sensor H provided on the discharge side of the drying chamber 1d on the most downstream side of the gas is controlled to be 7.9% in relative humidity. Yes. Moreover, the temperature sensor T is provided in the discharge | emission side of each drying chamber, and is controlled so that the value of each temperature sensor may be 100 degreeC, respectively. 1,080 kg ′ / h of outside air having a relative humidity of 60.7% is introduced into the drying chamber 1a from the outside. In the drying chambers 1b to 1d, 12080 kg ′ / h of gas discharged from the upstream drying chamber is introduced. Accordingly, the amount of gas circulated to the drying chambers 1a to 1d through the circulation duct is 20920 kg ′ / h. Based on the above assumption, the gas conditions in the main part of the drying apparatus X were calculated.

  A gas having a relative humidity of 60.7% and a gas amount of 12080 kg ′ / h introduced from the outside is mixed with a gas having a relative humidity of 3.5% and a gas amount of 20920 kg ′ / h circulated from the drying chamber 1a, and is heated. To be introduced. The gas heated by the heating means becomes a gas having a relative humidity of 3.2% and a gas amount of 33000 kg '/ h, and is introduced into the drying chamber 1a.

  Gas supply, circulation, discharge, and water removal amount in each drying chamber are the same as in the example in which a temperature sensor is installed on the downstream side of the heating means of the above embodiment. However, among the gases discharged from each drying chamber, a gas having a gas amount of 20920 kg '/ h is circulated to the drying chamber, and a gas having a gas amount of 12080 kg' / h is supplied to the next drying chamber. In the case of the drying chamber 1d, a gas having a gas amount of 12080 kg '/ h is discharged to the outside of the drying apparatus X. From the above, the amount of outside air introduced into the drying apparatus X or discharged from the drying apparatus was 12080 kg '/ h.

  In the example of FIG. 8, the value of each temperature sensor is controlled to be 100 ° C., respectively. Therefore, the temperature of the gas supplied to each drying chamber is 102.0 ° C. in the drying chamber 1a, 105.8 ° C. in the drying chamber 1b, 111.4 ° C. in the drying chamber 1c, and 111.2 ° C. in the drying chamber 1d. It has become. For example, when the heat-resistant temperature of the material to be dried D is 100 ° C., the structure to be dried as shown in FIG. The temperature of the gas which hits is less than 100 ° C. That is, compared with the example which installed the temperature sensor in the downstream of the heating means of said embodiment, higher temperature gas is introduce | transduced into a drying chamber and it is dried without damaging the to-be-dried object D.

[3. effect]
In this embodiment, the temperature sensor is disposed on the discharge side of each drying chamber, and the value of the temperature sensor T is controlled to be a predetermined temperature. As shown in FIG. 9, under the same conditions as the temperature and humidity settings in FIG. 8, the outside air to be introduced is assumed to be outside air with an average annual temperature and humidity (temperature 16.1 ° C., relative humidity 76.2%), and the annual energy used is Calculated. In the drying apparatus X of the present embodiment, when a steam heating unit is used, the total temperature heated by each heating unit is 42.0 ° C. Therefore, the annual energy consumption is 3372600 kWh, and the amount of steam used for heating is 5931 ton / year. As described above, the drying apparatus X of the present embodiment can further improve the energy saving property.

  Thus, when the temperature sensor T is provided on the discharge side, the heating means supplies the air so that the temperature after the supplied gas is supplied to the drying object D becomes a predetermined temperature. The temperature will be set. When controlling based on the temperature after a heating means heats, the actual drying chamber temperature may be lower than necessary. However, when the temperature sensor T is provided on the discharge side, control based on the actual temperature of the drying chamber can be performed, so that drying can be performed efficiently. Therefore, it is possible to efficiently dry without deteriorating the quality of the material D to be dried.

[Third Embodiment]
[1. Configuration]
The configuration of the drying apparatus X of the third embodiment is basically the same as that of the first embodiment or the second embodiment. However, in the control device Y of the drying apparatus X, the predetermined temperature stored in the set temperature storage unit 301 is set such that the temperature of the drying chamber on the most downstream side of the gas is the highest, and the drying chamber on the upstream side of the gas It is set so that the temperature gradually becomes lower gradually. For example, when four drying chambers 1a to 1d are provided, the temperature can be set such that the temperature of the drying chamber 1d> the temperature of the drying chamber 1c> the temperature of the drying chamber 1b> the temperature of the drying chamber 1a.

  However, the temperature setting is not limited to gradually lowering in all of the plurality of drying chambers, and may be set to the same temperature setting in some of the drying chambers. That is, it is only necessary that the temperature of the drying chamber on the most downstream side of gas is set highest and the temperature of the drying chamber on the most upstream side of gas is set lowest.

  In the example shown in FIG. 10, the temperature sensor T is provided on the downstream side of each heating means. In the example shown in FIG. 11, the temperature sensor T is provided on the discharge side of each drying chamber. The set temperature storage unit 301 stores 105.0 ° C. in the drying chamber 1a, 110 ° C. in the drying chamber 1b, and 120.0 ° C. in the drying chambers 1c and 1d as the temperature of each temperature sensor. In addition, it is assumed that the heat-resistant temperature of the to-be-dried object D is 125 degreeC. Therefore, it is preferable that a gas of 120 ° C. or less hits the material to be dried D.

[2. Action]
In the example of FIG. 10, a gas of 105.0 ° C. is introduced into the drying chamber 1a, 110 ° C. of the drying chamber 1b, and 120.0 ° C. of the drying chambers 1c and 1d. In the example of FIG. 11, the drying chamber 1a has 107.0 ° C., the drying chamber 1b has 115.7 ° C., the drying chamber 1c has 130.9 ° C., and the drying chamber so that the temperature of the discharged gas becomes a predetermined value. In 1d, a gas at 130.3 ° C. is introduced into each drying chamber.

  FIG. 12 shows a graph of the concept of the drying mode of the material D to be dried by the drying apparatus X as described above. The material to be dried D introduced into the drying chamber 1d has a high water content. For this reason, the temperature of the drying chamber 1d is lower than the heat resistance temperature even if a gas having a temperature of 120 ° C. or higher, which is as high as possible, is introduced after considering the heat resistance temperature of the material D to be dried. In the drying chamber 1c, the drying object D is gradually dried, while the moisture content remains relatively high. Accordingly, in the drying chamber 1c, even if the supply air temperature is raised to, for example, the heat resistance temperature of the material D to be dried, the temperature in the drying chamber 1c does not exceed the heat resistance temperature.

  Using this principle, in the present embodiment, the temperatures of the drying chambers 1c and 1d on the gas downstream side are set higher than those of the other drying chambers 1a and 1b. Even if the supply air temperature and the room temperature to the drying chambers 1c and 1d are higher than the heat resistance temperature of the material D to be dried, if the temperature of the material D to be dried is lower than the heat resistance temperature, the room temperature is The supply air temperature may be increased so that the temperature exceeds the heat resistance temperature of the dried product D. When controlling in this way, it is preferable to directly measure the temperature of the material D to be dried by thermography.

  In the drying chamber 1c, the moisture content of the material to be dried D reaches the limit moisture content. If it does so, the temperature of the supplied gas will not fall, and the temperature in the drying chamber 1c will begin to rise. Therefore, if the supply air temperature is continuously maintained at 120 ° C. or higher in the drying chamber 1b, the temperature in the drying chamber 1b may rise to the heat resistant temperature of the material D to be dried. Accordingly, in the drying chamber 1b, the set temperature is set to 110 ° C. so that the room temperature becomes 120 ° C. or lower. Also in the drying chamber 1b, the drying of the material to be dried D proceeds and the moisture content of the material to be dried D becomes a value close to the equilibrium moisture content. Then, in the drying chamber 1a where the moisture content of the material to be dried D is approximately the equilibrium moisture content, drying is performed at a set temperature of 105 ° C.

[3. Effect]
In the present embodiment as described above, in addition to the above-described embodiment, the following effects are further achieved. In this embodiment, the temperature of the drying chamber on the most downstream side of the gas is set to be the highest, and the temperature is set to gradually become lower as the drying chamber on the upstream side of the gas is reached. Therefore, in the drying chambers 1c and 1d in which the moisture content of the material to be dried D is relatively high, it is possible to increase the drying speed and to efficiently dry the material to be dried D by supplying a higher temperature gas.

  Further, under the same conditions as the temperature and humidity settings shown in FIGS. 10 and 11, the outside air to be introduced is assumed to be the outside air having an annual average temperature and humidity (temperature 16.1 ° C., relative humidity 76.2%). The amount of energy used was calculated. FIG. 13 shows an example in which a temperature sensor is installed on the downstream side of the heating means, and FIG. 14 shows an example in which a temperature sensor is installed on the discharge side of the drying chamber.

In the drying apparatus X of the present embodiment shown in FIG. 13, when a steam heating unit is used, the total temperature heated by each heating unit is 38.2 ° C. Therefore, the annual energy consumption is 3067460 kWh, and the amount of steam used for heating is 5394 ton / year. From the above, the drying device X of the present embodiment can improve energy saving.

  In the drying apparatus X of the present embodiment shown in FIG. 14, when a steam heating unit is used, the total temperature heated by each heating unit is 35.6 ° C. Therefore, the amount of energy used for the year is 2858680 kWh, and the amount of steam used for heating is 5027 ton / year. From the above, the drying device X of the present embodiment can improve energy saving.

[Other embodiments]
(1) In the above embodiment, the humidity sensor H has been described as measuring relative humidity. However, as the humidity sensor H, a sensor that measures the degree of saturation may be used. That is, by using the saturation sensor, the drying apparatus X is controlled based on the saturation of the gas that has passed through the drying chamber 1a, and the moisture / solvent contained in / to be dried D is removed. good. The humidity sensor H includes a sensor that measures the moisture content of the material to be dried D in addition to the relative humidity or the saturation, and can be appropriately selected depending on the object to be dried.

  (2) In the above embodiment, when the value of the humidity sensor H is a predetermined value, the amount of gas to be introduced can be reduced. However, the conveyance speed of the material to be dried D may be increased while keeping the amount of gas to be introduced constant. When controlled in this way, the drying efficiency can be improved.

  (3) In the above embodiment, the humidity sensor H is provided on the discharge side of the drying chamber on the most downstream side of the gas. However, the humidity sensor H may be provided on the discharge side of the drying chamber on the most upstream side of the gas, and the outside air may be introduced so that the relative humidity becomes a predetermined value. By comprising in this way, it can be confirmed whether it becomes the desired humidity in the drying chamber 1a in which the to-be-processed object D is carried in last. That is, the final dry state of the material to be dried D can be confirmed. Moreover, when the humidity of the drying chamber 1a is a predetermined value, the amount of outside air to be introduced can be reduced, so that energy saving can be improved. In addition, it is good also as a structure which provides the humidity sensor H in the discharge side of the drying chamber of the most downstream side and the most upstream side of gas, respectively. The control in this case is controlled so that the value of each sensor H satisfies a predetermined value.

  (4) The heating conditions of the heating means 3a to 3c determined in the above embodiment and the gas amount conditions of the gas amount adjusting means 2a to 2c are, for example, the types of the heating means and the capacity of the drying chamber. In addition to the configuration, it is set as appropriate based on the amount of water removed from the material to be dried D. In addition, these conditions are the gas loss to the outside of the system, the time during which the transport device C transports the material D to be dried in the drying chambers 1a to 1d, and the heat loss calculated based on the heat capacity of the transport device C. These are determined in consideration of various conditions, and can be appropriately changed according to the installation state of the drying apparatus X.

  (5) In the above embodiment, the example in which the drying apparatus X is controlled so as to adjust the dryness of the material to be dried D using the relative humidity under the condition that the air volume and the wind speed are constant has been described. However, a configuration may be adopted in which the relative humidity is set in consideration of changes in the air volume and the wind speed. That is, when the relative humidity rises, the relative humidity may be decreased by increasing the air volume.

A1 Outside air amount adjusting means A2 Exhaust amount adjusting means 1a to 1d Drying chambers 2a to 2c Gas amount adjusting means 3a to 3c Heating means 4a to 4c Air supply duct 4d Exhaust ducts 5a to 5c Circulating ducts 6a to 6c Damper D Dried object T Temperature sensor H Humidity sensor 21 Gas amount adjusting unit driving unit 31 Heating unit driving unit 101 Input unit 102 Output unit 200 Gas amount control unit 201 Setting humidity storage unit 202 Humidity comparison unit 203 Gas amount condition determining unit 300 Heating temperature control unit 301 Setting Temperature storage unit 302 Temperature comparison unit 303 Heating condition determination unit

Claims (14)

Provided with a plurality of drying chambers to be dried by blowing air,
In each of the plurality of drying chambers,
Gas amount adjusting means for adjusting the amount of gas introduced into the drying chamber;
And heating means for heating the gas introduced by the gas amount adjusting means,
The plurality of drying chambers are configured such that the gas discharged from the drying chamber on the upstream side of the gas is sequentially introduced into the drying chamber on the downstream side of the gas,
In the plurality of drying chambers, a transport unit that transports an object to be dried from a drying chamber on the most downstream side of the gas toward a drying chamber on the most upstream side of the gas,
Of the plurality of drying chambers, the drying chamber on the most upstream side of the gas is connected to an outside air amount adjusting means for adjusting the amount of the outside air to be introduced,
Among the plurality of drying chambers, a humidity sensor for measuring the relative humidity of the gas is provided on the discharge side of the drying chamber on the most downstream side of the gas,
Outside air amount adjusting means, the drying apparatus relative humidity measured by the humidity sensor is characterized that you introduce outside air to a predetermined value. Each of the plurality of drying chambers is provided with a temperature sensor that measures the temperature of the gas,
The heating means connected to each of the plurality of drying chambers is configured to heat the gas so that the temperature measured by the temperature sensor of each drying chamber becomes a predetermined value. claim 1 Symbol placement of the drying apparatus. The drying apparatus according to claim 2 , wherein the temperature sensors are respectively provided on the discharge sides of the plurality of drying chambers. The temperature of the predetermined value is set so that the temperature of the drying chamber on the most downstream side of the gas is set highest and gradually becomes lower as the drying chamber on the upstream side of the gas is reached. The drying apparatus according to claim 2 or 3 . The drying apparatus according to any one of claims 1 to 4, further comprising a circulation duct for reintroducing at least a part of the gas discharged from the drying chamber into the drying chamber. Each of the plurality of drying chambers is further provided with an indoor pressure adjusting means,
In the plurality of drying chambers, the pressure inside the drying chamber on the upstream side of the gas is adjusted to be equal to or higher than the pressure inside the drying chamber on the downstream side of the gas,
The drying apparatus according to any one of claims 1 to 5, wherein the pressure in the drying chamber on the most downstream side of the gas is adjusted to be higher than the pressure outside the drying apparatus. With multiple drying chambers,
The gas discharged from the drying chamber on the upstream side of the gas is configured to be sequentially introduced into the drying chamber on the downstream side of the gas,
In the plurality of drying chambers, in the control device of the drying apparatus including a transport unit that transports an object to be dried from the drying chamber on the most downstream side of the gas toward the drying chamber on the most upstream side of the gas,
A drying apparatus comprising: a gas amount control unit that controls the amount of outside air introduced into the drying chamber on the most upstream side of the gas based on the humidity of the gas discharged from the drying chamber on the most downstream side of the gas Control device. The heating temperature control unit that controls the temperature of the gas in each drying chamber based on the temperature of each drying chamber of the drying device so that the temperature of each drying chamber becomes a predetermined temperature. 8. A control device for a drying apparatus according to item 7 . 9. The control device for a drying device according to claim 8 , wherein the temperature of each drying chamber of the drying device is a temperature on the discharge side of each drying chamber. The heating temperature control unit sets the temperature of each drying chamber to the highest temperature in the drying chamber on the most downstream side of the gas, and gradually decreases as the temperature becomes the drying chamber on the upstream side of the gas. The control device for a drying apparatus according to claim 8 or 9 , wherein the control is performed as described above. With multiple drying chambers,
The gas discharged from the drying chamber on the upstream side of the gas is configured to be sequentially introduced into the drying chamber on the downstream side of the gas,
In the plurality of drying chambers, control of a drying device that controls a drying device including a transport unit that transports an object to be dried from a drying chamber on the most downstream side of the gas toward a drying chamber on the most upstream side of the gas. In the method
A method for controlling a drying apparatus, comprising: controlling an amount of outside air introduced into a drying chamber on the most upstream side of the gas, based on humidity of the gas discharged from the drying chamber on the most downstream side of the gas. The drying based on the temperature of the drying chamber of the apparatus, so that the temperature of the drying chamber reaches a predetermined temperature, drying apparatus according to claim 1 1, wherein the controlling the temperature of the gas in the drying chamber Control method. The method of the drying temperature of the drying chamber of the apparatus, a drying apparatus according to claim 1 2, wherein the the temperature of the discharge side of the drying chamber. The temperature of each of the drying chambers is set so that the temperature of the drying chamber on the most downstream side of the gas is set highest, and is controlled so as to gradually become lower as the drying chamber becomes upstream of the gas. claim 1 2 or 1 3 controlling method of a drying apparatus according to.

Images