JP5390920B2 - Dryer drying control method - Google Patents

Description

  The present invention relates to a drying control method for a dryer used for drying foods such as agricultural products and marine products, processed products, and the like.

  DESCRIPTION OF RELATED ART Conventionally, the food dryer which dries seafood, such as shiitake mushrooms and vegetables agricultural products and small fish, is known. A typical food dryer has multiple rows of shelves in a drying chamber, and a drying tray (generally called “shrimp”) with agricultural products arranged as appropriate is hung on each shelf in the drying chamber. And, fresh fresh air is introduced into a hot air generator attached to the drying chamber to generate hot air in the hot air generator, the generated hot air is sent to the lower portion of the drying chamber and blown up from the lower portion of the drying chamber to the drying chamber, Thereby, the material of the tray in the drying chamber is dried.

  As such dryers, shiitake dryers and dryers using a plurality of carts that can store trays in multiple stages have been proposed (see Patent Document 1 and Patent Document 2). In the drying operation of the dryer, the drying temperature in the drying chamber is controlled by on / off control of the burner according to a preset drying program, and the drying temperature in the drying chamber is raised stepwise. Yes.

Japanese Utility Model Publication No. 63-032291 Japanese Utility Model Publication No. 63-002869

  However, the drying operation in the initial stage of drying sometimes failed in the winter or early spring. That is, as shown in FIG. 10, in the initial stage of drying, it is ensured that the upper and lower width of the temperature control with respect to the drying temperature (control temperature) in the drying chamber by the on / off control of the burner is within about 5 ° C. In the past, the temperature in the drying chamber was controlled regardless of the intake air temperature. Therefore, especially during the winter when the intake air temperature is 5 ° C or lower and in the low temperature period in early spring, the conventional drying program is used. And the temperature difference ΔT between the intake air temperature and the control temperature is large. Therefore, during the initial drying period in which 100% of the low temperature outside air is always introduced, as shown in FIG. The temperature control in the drying chamber was not stable, and the fluctuation width of the temperature control tended to expand to about 7 ° C to 10 ° C. And there existed a problem that the dry quality in the initial stage of drying fell because temperature control in a drying room was not stabilized.

  The present invention has been made in view of the above problems, and in particular, in drying operations in the low temperature period of winter and early spring, it is possible to stabilize the control of the drying temperature in the initial stage of drying, thereby preventing the deterioration of the drying quality in the initial stage of drying. An object of the present invention is to provide a drying control method for a dryer, which can obtain a dry product of good quality.

In order to solve the above-mentioned problems, a drying control method for a dryer according to the present invention divides a drying process into three or more processes, and in accordance with a preset drying program, hot air supplied from the hot air generator to the drying chamber. In the drying control method of the dryer, the air volume from the blower is lowered step by step for each of the plurality of steps or for each step from the initial drying stage to the late drying stage, and the drying of the material in the drying chamber is advanced.
At the start of the drying operation, an initial value is set as the intake air temperature of the outside air to be introduced into the hot air generator, and the drying program at the initial drying time when the intake air temperature at the start of the drying operation is equal to or lower than the initial setting value is set. Reduce the airflow setting level for each process by one or more steps from the airflow setting level for each process at the beginning of drying in the drying program when the intake air temperature at the start of drying operation exceeds the initial setting value. The first feature is that it is set.

  The drying program sets the drying temperature, process time, intake damper opening, and air volume in the drying chamber in advance for each process from the initial stage of drying, the middle stage of drying, and the latter stage of drying. The temperature and humidity in the room are detected, and the temperature in the drying chamber is raised step by step as each process time elapses, and the amount of hot air supplied from the hot air generator to the drying chamber is blown by a plurality of processes. Alternatively, the pull-down operation is performed step by step for each process.

  At this time, at the start of the drying operation, an initial value is set as the outside air intake temperature to be introduced into the hot air generator, and the drying program when the intake temperature at the start of the drying operation is equal to or lower than the initial setting value, One or more levels of airflow setting level in each process in the initial stage of drying than the airflow setting level in each process in the initial stage of drying in the drying program when the intake air temperature at the start of the drying operation exceeds the initial setting value By setting so as to be lowered, it is possible to prevent the drying quality from being deteriorated at the initial stage of drying, particularly in a drying operation at a low temperature in winter or early spring. In other words, even in a low temperature period where the temperature difference ΔT between the intake air temperature and the control temperature is large, the relational expression Qt = Cpa × Qa × ΔT is used for a certain amount of heat (Qt) input from the furnace. By reducing the air volume (Qa), it becomes easier to ensure the temperature difference ΔT described above, and as a result, temperature control in the drying chamber by on / off control of the furnace is stabilized, and deterioration in drying quality at the initial stage of drying can be prevented. . In the above relational expression, Cpa means the specific heat of air.

  The drying control method for a dryer according to the present invention is characterized in that the initial setting value of the intake air temperature at the start of the drying operation is 5 ° C.

  From experience, the temperature control in the drying chamber by the on / off control of the furnace in the initial stage of drying is not particularly stable during the low temperature period when the intake air temperature is 5 ° C or less. However, the intake air temperature at the start of the drying operation is 5 ° C or less. At a certain time, stable temperature control in the drying chamber can be realized by lowering the setting level of the air flow rate in each step in the initial stage of drying by one or more steps.

  In the drying control method for a dryer according to the present invention, when the intake air temperature exceeds the initial set value in any step in the initial stage of drying, the set air volume after the reduction is returned to the setting level of the air volume before the reduction and the air flow is reduced. A third feature is that hot air is supplied from the hot air generator into the drying chamber in accordance with the previously set air volume.

  In any step in the initial stage of drying, when the intake air temperature exceeds the initial set value, the drying air quality in the initial drying stage can be further improved by returning the set air volume after reduction to the setting level of the air volume before reduction. it can.

The drying control method for a dryer according to the present invention sets a reference value as the amount of material accommodated in the drying chamber at the start of the drying operation, and the amount of material accommodated in the drying chamber is equal to or less than the reference value. The air volume of each process from the beginning of drying to the end of drying in the drying program at the time, and the air volume of each process from the beginning of drying to the end of drying in the drying program when the capacity of the material stored in the drying chamber exceeds the reference value The fourth feature is that each is set to be lowered.

  As described above, according to the drying control method of the dryer according to the present invention, the temperature control in the drying chamber in the initial drying stage is stabilized, particularly in the low temperature period such as winter or early spring, thereby drying the dried material such as shiitake mushrooms. It is possible to prevent deterioration of quality in the initial stage, to achieve stable drying throughout the year, and to obtain an excellent effect that a dry product having excellent quality can be obtained.

  In addition, by stabilizing the control of the drying temperature in the initial stage of drying, it is possible to reduce the amount of fuel used for drying, thereby realizing a drying operation with a high energy saving effect.

The front view which shows 1st Embodiment of this invention and shows the dryer which enforces the drying control method of this invention, Sectional drawing which shows the driving | running state of the dryer shown in FIG. A diagram showing the drying program when the intake air temperature exceeds 5 ° C. It is a figure which shows the drying program in case intake temperature is 5 degrees C or less. 2 shows a second embodiment of the present invention, a dryer for performing the drying control method of the present invention, Installation state diagram of the open / close damper installed in the dryer shown in FIG. The figure which shows the drying program for 60 sheets of drying trays, The figure which shows the drying program for 30 drying trays, Sectional drawing which shows the driving | running state of the dryer shown in FIG. It is explanatory drawing which shows the condition of the temperature control of the drying chamber by on / off control of a burner.

  A first embodiment for carrying out the present invention will be described with reference to FIGS. In FIG. 1, 1 is a food dryer.

  First, the structure of the food dryer 1 will be described. As shown in FIGS. 1 and 2, the food dryer (hereinafter referred to as “dryer”) 1 is provided with a hot air generator 2 and a drying chamber 3. Yes.

  In the hot air generator 2, a furnace 6 including a burner 5 in a lower unit of a casing 4, a heat exchanger 7 communicating with the furnace 6 are arranged, and a blower 8 is arranged in an upper unit. A control device 9 and a chimney 10 communicating with the heat exchanger 7 are arranged outside. The hot air generator 2 heats fresh outside air in the working chamber taken in from the air inlet 11 of the upper unit by the blower 8 by the furnace 6 heated by the flame of the burner 5 and the subsequent heat exchanger 7. The dried hot air is sent from the hot air outlet 12 of the lower unit to the lower space of the side drying chamber 3 by the blower 8. An intake damper 13 that adjusts the intake amount of air is attached to the intake port 11. The opening degree of the intake damper 13 is controlled by a control signal according to a drying program from the control device 9.

  The drying chamber 3 is provided with 2 rows × multiple tiers (for example, 15 tiers) of shelves 15 inside a box-shaped casing 14 so that a plurality of drying trays 16 can be accommodated in the 2 rows × multiple tiers of shelves 15. It has become. A sealing door 18 is provided at the entrance 17 of the drying chamber 3. A rectifying plate 20 is provided at the lower portion of the casing 14 to form a large number of holes 20a while leaving the lower space 19 between the bottom inner surface. The rectifying plate 20 functions to rectify the hot dry air sent to the lower part of the casing 14 and blow it up as a uniform flow into the drying chamber 3.

  An exhaust port 22 having an exhaust duct 21 is formed in the upper ceiling of the casing 14. A wind pressure type exhaust damper 23 is provided in the exhaust duct 21. The exhaust damper 23 is opened and closed in conjunction with the movement of the intake damper 13. An extension duct 24 whose length can be adjusted is slidably provided in the exhaust duct 21.

  As shown in FIG. 2, the exhaust damper 23 is rotatably supported around the upper shaft 23 a in the exhaust duct 21, and is rotated by wind pressure in conjunction with the opening degree of the intake damper 13. When the intake damper 13 has an opening of 100% (fully open), the exhaust damper 23 is fully opened, and all of the air used for drying is exhausted to the outside through the exhaust duct 21, and the intake damper 13 has an opening of 0% ( When fully closed), the exhaust damper 23 is fully closed, and all the air used for drying is circulated between the drying chamber 3 and the hot air generator 2. When the exhaust duct 21 is fully closed, the closed state of the exhaust damper 23 is maintained by the lower stopper 23b.

  The extension duct 24 penetrates the wall W of the work room in which the dryer 1 is installed and extends outside the room. As a result, the air used for drying is guided to the outside from the exhaust duct 21 via the extension duct 24 and exhausted. In addition, a hot air circulation port 25 for returning the hot air blown up in the drying chamber 3 into the hot air generating device 2 is provided in the upper portion of the side wall on the hot air generating device 2 side.

  A drying temperature sensor 26 for measuring the drying temperature in the drying chamber 3 is installed near the hot air outlet 12 of the hot air generator 2. A relative humidity sensor 27 for detecting the relative humidity in the drying chamber 3 is installed on the inner surface of the hermetic door 18 of the drying chamber 3 and above the drying tray 16. An intake air temperature sensor 28 that measures the intake air temperature of the outside air introduced into the hot air generator 2 is disposed in the vicinity of the intake port 11.

  3 and 4 show an example of a drying program (drying material: shiitake) of the present dryer. FIG. 3 shows a drying program A when the intake air temperature exceeds 5 ° C., and FIG. 4 shows a drying program B when the intake air temperature is 5 ° C. or less.

  In the drying program A (when the intake air temperature exceeds 5 ° C.) shown in FIG. 3, the drying process is divided into a total of 7 processes from the first process to the seventh process. Each item of [Time], [Intake damper opening], and [Air volume level] is set. The first to third steps are included in the initial stage of drying, the fourth and fifth steps are included in the middle stage of drying, and the sixth and seventh steps are included in the late stage of drying.

  In the initial stage of drying, the drying temperature is 43 ° C., the process time is 2 hours, the intake damper opening is 100%, and the air flow level is 100% in the first process, and the drying temperature is 45 ° C., the process time is 2 hours, and the intake damper is opened. In the third process, the drying temperature is 47 ° C., the process time is 2 hours, the intake damper opening is 100%, and the air volume level is 95%. Further, in the middle stage of drying, in the fourth step, the drying temperature is set to 50 ° C., the process time is set to 2 hours, the intake damper opening is set to 70%, and the air flow level is set to 90%. The damper opening is set to 20% and the air flow level is set to 85%. Further, in the latter stage of drying, in the sixth step, the drying temperature is 58 ° C., the process time is 3 hours, the intake damper opening is 10%, and the air flow level is 75%. In the seventh step, the drying temperature is 60 ° C., the process time is 3 hours, The damper opening is set to 10% and the air volume level is set to 75%.

  Here, among the setting items, [intake damper opening] refers to the opening of the intake damper 13, and 10 stages from the opening degree 100% to the opening degree 10% by the geared motor, that is, the opening degree 100% (opening degree 10). ), 90% opening (9 opening), 80% opening (8 opening), 70% opening (7 opening), 60% opening (6 opening), 50% opening (5 opening) ), Opening degree 40% (opening degree 4), opening degree 30% (opening degree 3), opening degree 20% (opening degree 2), and opening degree 10% (opening degree 1). [Airflow level] refers to the airflow level of the blower 8 and is controlled by inverter control in seven stages from the airflow level 100% to the airflow level 70%, that is, the airflow level 100% (airflow 7), the airflow level 95% (airflow). 6) Airflow level 90% (airflow 5), airflow level 85% (airflow 4), airflow level 80% (airflow 3), airflow level 75% (airflow 2), airflow level 70% (airflow 1) Is set to

  According to the drying program A, the [drying temperature] is 43 ° C. → 45 ° C. → 47 ° C. → 50 ° C. → 55 ° C. → 58 ° C. → 60 ° C. from the first step 43 ° C. to the seventh step 60 ° C. The intake air damper opening is raised from 100% in the first process to 10% in the seventh process from 100% → 100% → 100% → 70% → 20. % → 10% → 10%, and the number of steps is reduced step by step or every step. [Air volume level] is 100% → 100% → 95% → 90% → 85% → 75% → 75% from the air volume level 100% in the first process to the air volume level 75% in the seventh process. It is lowered step by step for each process. In the initial stage of drying, the drying program is particularly focused on the dehumidifying operation.

  In the drying program B shown in FIG. 4 (when the intake air temperature is 5 ° C. or lower), the three items “drying temperature”, “process time”, and “intake damper opening” are shown in FIG. When the temperature exceeds 5 ° C., the “air volume level” in the initial stage of drying is set differently from the drying program A.

  That is, in the drying program B, the air volume level 95% (air volume 6) in the first process included in the initial process, the air volume level 95% (air volume 6) in the second process, and the air volume level 90% (air volume 5) in the third process. In the first process, the first process is one stage than the first process in the first drying program, the second process is one stage than the second process in the first program, and the third process is the third process in the first program. The airflow level is lowered by one level. This makes it easy to ensure a temperature difference between the intake air temperature and the control temperature by lowering the air flow level for a constant input energy from the furnace 6 in the drying operation at a low temperature period where the intake air temperature is 5 ° C. or less. As a result, the temperature control in the drying chamber 3 by the on / off control of the burner 5 is stabilized, and the deterioration of the drying quality at the initial stage of drying is prevented.

  Next, in accordance with the above drying programs A and B, the drying procedure will be described using the dryer 1 as an example of raw shiitake mushroom as a drying material. First, at the start of the drying operation, the intake air temperature is measured by the intake air temperature sensor 28. When the intake air temperature exceeds the initial set temperature (5 ° C.), the control device 9 selects the drying program A (when the intake air temperature exceeds 5 ° C.) and starts from the first step in the initial stage of drying according to the drying program A. A drying operation leading to the seventh step in the late drying stage is performed.

  When the intake air temperature measured by the intake air temperature sensor 28 is equal to or lower than the initial set temperature (5 ° C.), the control device 9 selects the drying program B (when the intake air temperature is 5 ° C. or lower). Then, a drying operation is performed from the first step in the early stage of drying to the seventh step in the later stage of drying. Hereinafter, the drying procedure will be described according to the drying program B.

(Dry initial)
When the “operation” button is pressed, the burner 5 in FIG. 1 is ignited and the blower 8 is driven. As shown in FIG. 2, low-temperature outside air is introduced into the hot air generator 2 from the fully-open intake port 11. Then, the dry hot air generated by the furnace 6 and the heat exchanger 7 is sent from the hot air outlet 12 to the lower portion of the drying chamber 3. At this time, the air flow level by the blower 8 is lowered by one step from the air flow level of 100% to the air flow level of 95% according to the drying program B. The hot hot air sent to the lower part of the drying chamber 3 passes through the current plate 20 and blows up in the drying chamber 3. Meanwhile, the shiitake mushrooms on the tray 16 are heated to evaporate the water. The blown-up air passes through the exhaust duct 21 that is fully open from the exhaust port 22 on the ceiling, and is exhausted to the outside of the working room. Meanwhile, the relative humidity detection sensor 27 in the drying chamber 3 detects the relative humidity in the drying chamber 3 and sends a detection signal to the control device 9.

  When the process time (2 hours) of the first process is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 43 ° C. to 45 ° C. by a control signal from the control device 9. Further, the air flow level by the blower 8 is reduced by one step from the air flow level of 100% to the air flow level of 95% according to the drying program B as in the first step. When the process time of the second process (2 hours) is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 45 ° C. to 47 ° C. by a control signal from the control device 9. Further, according to the drying program B, the air flow level by the blower 8 is lowered by one step from the air flow level 95% to the air flow level 90%.

  Here, in each step from the first step to the third step in the initial stage of drying, the air flow level by the blower 8 is changed from the air flow level 100% to the air flow level 95% and from the air flow level 95% to 90% according to the drying program B. Since the temperature is lowered step by step, the temperature control in the drying chamber 3 by the on / off control of the burner 5 is stabilized in the drying operation at a low temperature. Thereby, deterioration of the dry quality in the initial stage of drying can be prevented.

(Dry season)
When the process time of the third step (2 hours) is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 47 ° C. to 50 ° C. by the control signal from the control device 9, and the fourth step in the middle stage of drying. After that. Further, the air volume level by the blower 8 is maintained at the same air volume level 90% as the drying program A. When the process time of the fourth step (2 hours) is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 50 ° C. to 55 ° C. by a control signal from the control device 9. Further, the air volume level by the blower 8 is reduced to the same air volume level 85% as that of the drying program A.

(Late drying)
When the process time of the fifth step (3 hours) is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 55 ° C. to 58 ° C. according to the control signal from the control device 9, and the late drying stage (finishing drying stage) ) And subsequent steps. Further, the air volume level by the blower 8 is lowered to the air volume level of 75% which is the same level as the drying program A. When the process time of the sixth step (3 hours) is reached by the timer measurement, the drying temperature in the drying chamber 3 is raised from 58 ° C. to 60 ° C. by a control signal from the control device 9. Further, the air volume level by the blower 8 is maintained at the same air volume level 75% as that of the drying program A. Then, after the process time (3 hours) of the seventh process has elapsed, the drying operation is terminated by a control signal from the control device 9.

  According to the present embodiment, in each step of the initial stage of drying with emphasis on the dehumidification operation, when the intake air temperature is as low as 5 ° C. or less, the drying temperature of the drying temperature by the on / off control of the burner 5 remains unchanged with the drying program A. When the control is not stable, the air flow level of the blower 8 at the initial stage of drying is switched to the air flow level 95% and 90% lower than the air flow levels 100% and 95% in the case of the drying program A by switching to the drying program B, respectively. Since the temperature is lowered, it becomes easier to secure a temperature difference between the intake air temperature by the introduction of outside air and the control temperature (drying temperature) with respect to the amount of heat generated from the furnace 6, and drying by the on / off control of the burner 5. Temperature control can be stabilized. Thereby, deterioration of the dry quality in the initial stage of drying can be prevented, and the dry quality can be improved.

  5 to 9 show a second embodiment of the present invention. The same members as those in the dryer 1 shown in FIG. The dryer 30 shown in FIG. 5 includes shelves 15 in two rows on the left and two rows on the right, a total of four rows × multiple rows (15 rows in the illustrated example) inside the horizontally long drying chamber 31. A total of 60 drying trays 16 can be accommodated, 30 on each shelf in the row and 30 on each shelf in the right two rows. In the lower space (preload chamber) 32 of the drying chamber 30, an open / close damper 34 is installed at the communication port 33 between the lower left row 32 </ b> A and the lower right row 32 </ b> B. As shown in FIG. 6, the open / close damper 34 supplies half of the hot air from the hot air generator to the right lower space 32B from the left lower space 32A to the right lower space 32B when fully opened (solid line), and to the right lower space 32B when fully closed. The hot air supply is cut off. In the vicinity of the open / close damper 34, a switch 35 that detects whether the open / close damper 34 is fully closed or fully open by an on / off signal and outputs each signal to the control device is installed. Exhaust ports 36 and 36 are respectively formed in the ceiling on the left two rows and on the right two rows, and exhaust ducts 37 extend outward from the exhaust ports 36.

  The dryer 30 includes two other drying programs C and D in addition to the two drying programs A and B described in the first embodiment. The drying program C is a program in which the open / close dampers 34 are fully opened, a maximum of 60 drying trays are accommodated in all rows of shelves, and the drying operation is performed. The drying program D is a fully closed open / close damper 34 and the left two rows of shelves. This program stores up to 30 drying trays and performs a drying operation. 7 and 8 show examples of the drying programs C and D.

The drying program C shown in FIG. 7 is set to a relatively strong air volume (reference value = 100 m ³ / min) in order to supply hot air to all four shelves in the drying chamber 30. However, when the air volume of the same setting is maintained and the material with a small harvest amount is evenly distributed and arranged on each of the four rows of shelves in the drying chamber 30 and dried, the gap between the materials is large. This causes the balance to be lost, leading to a decrease in dry quality. Therefore, when the harvest amount is small and can be accommodated in 30 drying trays, the program is switched to the drying program D shown in FIG.

  In the drying program D shown in FIG. 8, in the first to seventh steps, the items of [drying temperature], [step time], and [intake damper opening] are set to be the same as the drying program shown in FIG. The setting level of [air volume level] is set lower than the setting level of air volume in each process in the drying program C for 60 drying trays. Specifically, in the drying program C, the [air flow level] is set to 100%, 100%, 100%, 95%, 90%, 85%, 70% from the first step to the seventh step. On the other hand, in the drying program D, from the first step to the seventh step, 70%, 70%, 70%, 67%, 63%, 60%, 50%, and the material accommodated in the drying chamber 3 The air volume level is reduced by one or more steps in each process as compared with the drying program C in accordance with the amount of the air stored.

  In the drying operation of the drying program D, as shown in FIG. 9, the material is stored in the drying trays 16 in the left two rows of the drying chamber 31, the open / close damper 34 is fully closed, and the switch 35 in FIG. A fully closed signal is output to the control device, and the drying program D can be started based on the signal. In accordance with the drying program D, the air flow level from the first step to the seventh step is reduced in each step, so that the balance between the drying speed and the air amount of the materials stored in the drying tray 16 in the left two rows is achieved, and drying is performed. Quality degradation can be prevented.

  The drying control method according to the present invention can be used for drying foods such as agricultural products and marine products, processed products, and drying for crafts such as dried flowers.

DESCRIPTION OF SYMBOLS 1,30 Dryer 2 Hot air generator 3,31 Drying chamber 4,14 Casing 5 Burner 6 Furnace 7 Heat exchanger 8 Blower 9 Control device 10 Chimney 11 Inlet 12 Hot air outlet 13 Intake damper 15 Shelf 16 Drying tray 17 Inlet 18 Sealed door 19, 32, 32A, 32B Lower space 20 Rectifying plate 20a Hole 21, 37 Exhaust duct 22, 36 Exhaust port 23 Exhaust damper 23a Shaft 23b Stopper 24 Extension duct 25 Hot air circulation port 26 Dry bulb thermometer 27 Relative humidity Detection sensor 28 Intake air temperature sensor 33 Communication port 34 Open / close damper 35 Switch W Wall

Claims (4)

The drying process is divided into three or more processes, and in accordance with a preset drying program, the amount of hot air supplied from the hot air generator to the drying chamber by the blower is divided into a plurality of processes from the initial drying stage to the late drying stage. In the drying control method of the dryer in which the drying of the material in the drying chamber is advanced by pulling down step by step for each process,
At the start of the drying operation, an initial value is set as the intake air temperature of the outside air to be introduced into the hot air generator, and the drying program at the initial drying time when the intake air temperature at the start of the drying operation is equal to or lower than the initial setting value Reduce the airflow setting level for each process by one or more steps from the airflow setting level for each process at the beginning of drying in the drying program when the intake air temperature at the start of drying operation exceeds the initial setting value. A drying control method for a dryer, wherein the drying control method is set.   The drying control method for a dryer according to claim 1, wherein the initial setting value of the intake air temperature at the start of the drying operation is 5 ° C.   If the intake air temperature exceeds the initial set value in any step during the initial stage of drying, the set air volume after the reduction is returned to the setting level of the air volume before the reduction, and the hot air generator is dried according to the set air volume before the reduction. The drying control method for a dryer according to claim 1 or 2, wherein dry air is supplied into the room. At the start of the drying operation, a reference value is set as the amount of material stored in the drying chamber, and the drying program when the amount of material stored in the drying chamber is less than the reference value, from the initial drying stage to the end of drying. The air volume of each process is set to be lower than the air volume of each process from the beginning of drying to the end of drying in the drying program when the capacity of the material stored in the drying chamber exceeds the reference value. The drying control method for a dryer according to any one of claims 1 to 3, wherein:

Images