CN219347064U - Drying device for powder material - Google Patents

Abstract

The drying device for powder and granular materials of the present utility model comprises: the drying device comprises a drying hopper, a heater, a dehumidifying unit and a blower, wherein one end of the dehumidifying unit is communicated with the regenerating blower through a heating gas path and a regenerating heater, the other end of the dehumidifying unit is communicated with an exhaust pipe, the heating gas path is communicated with the exhaust pipe through a heating regeneration area, the drying device further comprises a regenerating exhaust gas temperature sensor and a control device, the regenerating exhaust gas temperature sensor is arranged on one side of the exhaust pipe of the heating regeneration area and used for detecting the temperature of processing gas from the heating regeneration area, and the control device monitors the drying capacity of the drying device based on the temperature of the processing gas. According to the drying apparatus of the present utility model, the change in heat loss of the powdery and granular material in the drying apparatus can be monitored, so that the drying capacity of the drying apparatus can be maintained in a stable state to ensure the drying quality of the powdery and granular material.

Description

Drying device for powder material

Technical Field

The present utility model relates to a drying device for a powder or granular material, which heats a gas blown from a blower through a heater and supplies the heated gas into a drying hopper storing the powder or granular material, thereby drying the powder or granular material.

Background

A conventional drying apparatus for a powdery and granular material is configured to include: a drying hopper for accommodating and receiving the powder material; a drying blower for blowing a drying gas to the drying hopper; and a heater for heating the drying gas blown to the drying hopper. In such a drying apparatus, external air is sucked in by a drying blower, heated by a heater, supplied into a drying hopper, passed through a powder or granular material layer stored in the drying hopper, and discharged from an exhaust port in the upper part of the drying hopper, thereby drying the powder or granular material.

In such a drying apparatus, if air containing moisture in the atmosphere is heated and then supplied to the drying hopper, the drying efficiency is poor. Therefore, the drying apparatus of the related art further includes a dehumidifying unit connected to the drying hopper and the heater through a gas circulation path, and the air with moisture discharged from the drying hopper is dehumidified by the dehumidifying unit and then sent to the heater to be heated, and then sent to the drying hopper to dry the powder or granular material, and the drying efficiency is remarkably improved as compared with the drying apparatus without the dehumidifying unit through such a heating-drying-dehumidifying-reheating cycle.

Regarding the drying capacity of the drying apparatus, i.e., the amount of the powder or granular material that the drying apparatus can dry in a unit time, it is generally considered to be affected by (1) the temperature (i.e., the temperature of the air heated by the heater for drying); (2) Air volume (i.e., the amount of hot air fed into the drying hopper per unit time); (3) Time (i.e., duration of hot air fed into the drying hopper); (4) Dew point (i.e., the moisture content of the air circulated for heating by the heater after removal of moisture by the dehumidification unit). Obviously, the higher the air supply temperature in unit time, the larger the air quantity, and the lower the water content of the air dehumidified by the dehumidification unit, the higher the drying capacity can be ensured. In the prior art, the air supply amount is relatively fixed (the air supply amount is determined by the specification of the selected blower), and whether the dried powder or granular material meets the requirement or not is generally monitored by temperature and dew point, and the drying time is determined on site according to the monitored temperature and dew point. That is, the air quantity is basically considered as a fixed quantity, and the drying capacity is controlled by adjusting the drying time according to the temperature of the hot air fed into the drying hopper and the water content of the air dehumidified by the dehumidification unit.

However, since the air volume is affected by many factors (such as air leakage due to deformation of the drying hopper with the increase of the service time, air leakage due to aging of the blower, path deformation or path connection seal aging, clogging of the air filter, clogging of dust in the drying unit components, etc.), it is necessary to consider the influence of the air volume change in actual operation. However, since the air volume cannot be accurately monitored, in the prior art, the corresponding relationship between the temperature, the dew point and the drying time is often adjusted periodically according to the drying quality of the dried powder material, so as to ensure the drying quality. However, since the above adjustment is performed regularly, there is a concern that the correspondence between the temperature, the dew point, and the drying time cannot be adjusted in time according to the change in the air volume, and thus, there is a problem that the drying quality is not stable enough.

Disclosure of Invention

The present utility model has been made in view of the above-described circumstances, and an object of the present utility model is to provide a drying apparatus for a granular material, which is capable of stably maintaining drying ability by monitoring a change in heat loss of the granular material in the drying apparatus, because the change in heat loss affecting the granular material affects the drying ability.

In order to achieve the above object, a drying apparatus for a powdery and granular material according to the present utility model comprises: a drying hopper which accommodates a powder or granular material and has an air inlet and an air outlet, wherein the powder or granular material accommodated therein is dried by hot air entering through the air inlet and then discharged from the air outlet; and the heater is communicated with the air inlet of the drying hopper through a hot air pipe; and a dehumidifying unit communicating with a process gas suction port of the heater through a process gas supply path; and a blower that communicates with the dehumidification unit through a process gas return path, the process gas that is sent to the heater by the blower through the process gas return path, the dehumidification unit, and the process gas supply path, is heated by the heater, then is sent into a drying hopper through a hot air pipe, dries a particulate material in the drying hopper, then is discharged from an exhaust port of the drying hopper, and then returns to the blower through the process gas return path, wherein one end of the dehumidification unit communicates with a regeneration blower through a heating gas path and a regeneration heater, and the other end communicates with an exhaust pipe, the heating gas path and the exhaust pipe communicate with each other through a heating regeneration region, and the drying apparatus further includes a regeneration exhaust gas temperature sensor that is provided on the exhaust pipe side of the heating regeneration region, and a control device that is connected to the regeneration exhaust gas temperature sensor, detects a temperature of the process gas from the heating regeneration region, and monitors drying capability of the drying apparatus based on the process gas temperature.

In the drying apparatus for a powdery/granular material according to the present utility model, the process gas supply path may be provided with a dew point detection sensor for detecting a dew point of the process gas supplied to the heater, and the control device may monitor a drying capacity of the drying apparatus based on the dew point detected by the dew point detection sensor.

In the drying apparatus for powder and granular materials according to the present utility model, the dehumidifying unit may be provided with an operation state detecting sensor for detecting an operation state of the dehumidifying unit, and the drying capacity of the drying apparatus may be monitored based on the operation state of the dehumidifying unit detected by the operation state detecting sensor.

According to the drying apparatus for a granular material of the present utility model, the change in heat loss of the granular material in the drying apparatus can be monitored, so that the drying capacity of the drying apparatus can be maintained in a stable state to ensure the drying quality of the granular material.

Drawings

Fig. 1 is a schematic explanatory view schematically showing an embodiment of a drying apparatus for a powdery or granular material according to the present utility model.

Fig. 2 is a control block diagram of the drying apparatus.

Detailed Description

Hereinafter, embodiments of the present utility model will be described with reference to the drawings.

Fig. 1 is a schematic explanatory view schematically showing a drying apparatus for a powdery and granular material according to an embodiment, and fig. 2 is a control block diagram of the drying apparatus.

As shown in fig. 1 and 2, a drying apparatus 1 for a powdery and granular material according to the present utility model includes: the drying apparatus includes a drying hopper 20, a dehumidifying unit 30, a process gas circulation path 10 connecting the drying hopper 20 and the dehumidifying unit 30, and a control unit 40 as a control device provided at an appropriate portion of the drying apparatus 1.

The process gas circulation path 10 includes: a process gas supply path 11 for blowing a process gas dehumidified by a dehumidification unit 30 described below to a drying hopper 20 described below; a process gas return path 12 for blowing a process gas containing moisture, which has been used in a dehumidification drying process of the particulate material m, through the drying hopper 20, to the dehumidification unit 30; a dehumidifying side branch pipe 12a and a regenerating side branch pipe 12b branched from the process gas return path 12; and a regeneration cooling gas return path 16 for collecting the regeneration cooling gas passing through a cooling regeneration region 32c described later in the process gas return path 12.

In the process gas return path 12, a circulation filter 13, a cooler 14, and a main blower 15 as a blower are disposed in this order from the drying hopper 20 toward the dehumidification unit 30. The process gas is circulated and supplied by driving the main blower 15 as described below.

The drying hopper 20, which includes: a hopper body 21 having a conical lower portion and a cylindrical upper portion, and storing powder and granular materials m sequentially fed from above; and a heater 26 for heating the process gas supplied through a dehumidification unit 30 described later.

A catcher 27 that captures the powder and granular material m conveyed from a material tank (not shown) or the like via a material conveying pipe 28 and temporarily stores the powder and granular material m is connected to the upper side of the hopper main body 21, and the powder and granular material m is sequentially fed into the hopper main body 21 by opening a material feeding valve 22 provided below the catcher 27.

The particulate materials m sequentially fed and stored in the hopper main body 21 are subjected to a dehumidification drying process as described later, and the particulate materials m are sequentially discharged to the next processing step (resin molding machine, temporary storage hopper, processing machine, etc. (not shown)) by opening a material discharge valve 23 provided below the hopper main body 21.

The above-described feeding of the powder and granular material m into the hopper body 21 is controlled based on a signal from a material sensor (not shown) such as a level gauge disposed at an upper portion of the hopper body 21, and is sequentially fed in accordance with the amount discharged from the material discharge valve 23, so that the amount of the powder and granular material m stored in the hopper body 21 is substantially constant. That is, the powder and granular materials m stored in the hopper main body 21 in a stacked state are subjected to a dehumidification drying process, sequentially discharged from the powder and granular materials m located at the lowermost layer, and new powder and granular materials m are fed from the upper catcher 27 in accordance with the discharged amount.

The powdery material m herein refers to a powdery material or a granular material, but includes a fine flake-like, short fiber flake-like, and flake-like material.

The material includes resin particles such as synthetic resin material, resin fiber sheets, and the like, or materials requiring dehumidification drying treatment such as metal materials, semiconductor materials, wooden materials, pharmaceutical materials, and food materials.

The powder and granular material m may be fed and discharged continuously or intermittently so that the amount of the powder and granular material m stored in the hopper body 21 is a certain amount of the powder and granular material m stored.

The process gas blown through the process gas supply path 11 is heated by the heater 26, and is discharged from a discharge port 24 as an air inlet provided in a lower portion of the hopper main body 21, and is supplied into the hopper main body 21.

The temperature of the heated process gas introduced into the hopper body 21 after being heated by the heater 26 can be appropriately set in accordance with the type of the powder or granular material m, the initial water content, the capacity or discharge amount of the hopper body 21, and the like, and can be set to a temperature of about 80 to 160 ℃.

The discharge ports 24 are arranged at the approximate center of the hopper body 21 in a circular shape in plan view, and supply the gas blown through the process gas supply path 11 in a uniformly dispersed manner.

The process gas discharged from the discharge port passes between the powder and granular materials m stored in the hopper main body 21 upward, dehumidifies and dries the powder and granular materials m, and is blown toward the exhaust port 25 formed in the upper portion of the hopper main body 21, and is exhausted from the exhaust port 25 toward the process gas return path 12.

The dehumidification unit 30 is a honeycomb type dehumidification unit, and includes a honeycomb rotor (dehumidification rotator) 31 having an adsorbent disposed therein to form an adsorbent, and covers 32 disposed at the upper and lower ends of the honeycomb rotor 31.

The honeycomb rotor 31 is a cylindrical body having a large number of gas flow passages in the axial direction, in which the adsorbent is immersed in ceramic fibers formed in a honeycomb shape, and is rotatable in the clockwise direction (the direction of the hollow arrow) in the drawing about the rotation shaft 33 by a rotation drive motor 39 (see fig. 2). The rotation of the honeycomb rotor 31 is continuously performed at a low speed at a rotational speed of several to ten or more weeks per hour, for example.

The adsorbent used in the honeycomb rotor 31 may be silica gel, titanium silica gel, lithium chloride, synthetic zeolite, or the like, but any material may be used as long as it is solid, and it can adsorb moisture and can be regenerated by a regeneration heating gas (moisture desorption) described later.

The cover 32 disposed at the upper and lower ends of the honeycomb rotor 31 has an inlet port into which the gas from each path is introduced and an outlet port from which the gas is discharged to each path. The lid 32 is formed with a partition wall 32d, and the partition wall 32d constitutes a partition forming mechanism for partitioning the dehumidification processing region 32a, the heating regeneration region 32b, and the cooling regeneration region 32c. The partition walls 32d are provided in three directions toward the centrifugal direction around the rotation shaft 33 of the honeycomb rotor 31, and in the present embodiment, the volume ratios of the dehumidification processing region 32a, the heating regeneration region 32b, and the cooling regeneration region 32c are 5:2:1, respectively.

The cover 32 is fixed to the apparatus main body, and the honeycomb rotor 31 is rotated relative to the cover 32, so that the honeycomb rotor 31 is divided into the three partitions (areas) in an airtight state by the three partition walls 32d formed in the cover 32.

The cover 32 is formed as a pair of upper and lower sides, and the same three partition walls 32d are formed in the cover 32 on the lower side in the drawing, corresponding to the three partition walls 32d formed in the cover 32 on the upper side.

The dehumidification side branch pipe 12a of the process gas return path 12 is connected to the upstream side (the cover 32 on the lower side in the drawing) of the dehumidification process region 32a, and the process gas supply path 11 is connected to the downstream side (the cover 32 on the upper side in the drawing) of the dehumidification process region 32a.

The regeneration-side branch pipe 12b of the process gas return path 12 is connected to the upstream side (the cover 32 shown at the lower side) of the cooling regeneration region 32c, and the regeneration-use cooling gas return path 16 is connected to the downstream side (the cover 32 shown at the upper side) of the cooling regeneration region 32c.

A regeneration heating gas path 37 to be described later is connected to the upstream side (upper cover 32 in the drawing) of the heating regeneration region 32b, and an exhaust pipe 38 is connected to the downstream side (lower cover 32 in the drawing) of the heating regeneration region 32b.

In the regeneration heating gas path 37, an intake filter 34, a regeneration blower 35 as a regeneration blower, and a regeneration heater 36 are arranged in this order from the upstream side toward the honeycomb rotor 31. In this regeneration heating gas path 37, the external air is introduced through the intake filter 34 by driving the regeneration blower 35, the regeneration heating gas is generated by heating the regeneration heater 36, and the generated regeneration heating gas is introduced into the heating regeneration region 32b of the honeycomb rotor 31 and then discharged to the outside of the apparatus through the exhaust pipe 38 on the downstream side thereof.

The temperature of the regeneration heating gas to be introduced after being heated by the regeneration heater 36 may be 180 to 240 ℃.

In the dehumidifying unit 30 having the above-described structure, the dehumidifying process of the process gas and the regenerating process of the honeycomb rotor 31 are performed as follows.

The process gas containing moisture, which has passed through the hopper main body 21 in which the particulate material m is stored, is cooled by the circulation filter 13 and the cooler 14 by driving the main blower 15 disposed in the middle of the process gas return path 12, and is then introduced into the dehumidification processing region 32a through the dehumidification side branch pipe 12 a.

The process gas introduced into the dehumidification processing region 32a passes through a gas flow passage in which an adsorbent is disposed in the honeycomb rotor 31 located in the dehumidification processing region 32a, and after moisture is adsorbed by the adsorbent, the process gas is blown as dehumidified process gas to the process gas supply path 11 (dehumidification processing step).

The adsorbent in the honeycomb rotor 31 having moisture adsorbed in the dehumidification processing region 32a reaches the heating regeneration region 32b as the honeycomb rotor 31 rotates.

In the heated regeneration region 32b, the regeneration heating gas is introduced through the regeneration heating gas path 37, and the adsorbent having adsorbed moisture is heated and dried to regenerate the adsorbent (release of moisture) (heated regeneration step).

The regeneration heating gas passing through the regeneration heating gas passage 37 and passing through the gas flow passage in which the adsorbent is disposed in the honeycomb rotor 31 in the heating regeneration region 32b is discharged to the outside of the apparatus through the exhaust pipe 38.

The adsorbent in the regenerated honeycomb rotor 31 is heated in the heating regeneration region 32b, and reaches the cooling regeneration region 32c as the honeycomb rotor 31 rotates.

In the cooling/regenerating region 32c, the process gas blown through the process gas return path 12 is cooled by the cooler 14, and the cooled gas is introduced into the cooling/regenerating region 32c through the regenerating side branch pipe 12b, so that the heated and regenerated adsorbent is subjected to cooling/regenerating (cooling/regenerating step).

In this way, the cooling process gas is to protect the main blower 15, and the adsorbent such as the synthetic zeolite has a characteristic that the moisture adsorption amount increases as the temperature decreases, so the cooling process gas is also to cool the honeycomb rotor 31 to improve the dehumidifying ability (moisture adsorption ability) of the adsorbent. Therefore, the cooler 14 is preferably disposed upstream of the main blower 15.

The temperature of the process gas cooled by the cooler 14 may be about 50 to 70 ℃.

As the cooler 14, a known cooler such as a water-cooled cooler or an air-cooled cooler can be used.

The regeneration cooling gas passing through the regeneration side branch pipe 12b and passing through the gas flow path provided by the adsorbent in the honeycomb rotor 31 in the cooling regeneration region 32c is blown toward the regeneration cooling gas return path 16 on the downstream side of the honeycomb rotor 31, and is collected in the process gas return path 12 and then blown toward the dehumidification unit 30.

The adsorbent in the honeycomb rotor 31 cooled and regenerated by the cooling and regenerating step reaches the dehumidification processing region 32a as the honeycomb rotor 31 rotates, and the dehumidification processing step, the heating and regenerating step, and the cooling and regenerating step are performed in the same manner as described below.

As described above, the process gas circulates between the drying hopper 20 and the dehumidifying unit 30.

As described above, in the present embodiment, since the process gas dehumidified by the honeycomb rotor 31 of the dehumidifier unit 30 is supplied to the hopper body 21 to dehumidify and dry the powdery or granular material m, for example, compared with a drying apparatus in which the outside air heated by the heater is directly introduced into the hopper body to dry the powdery or granular material, the heater can be reduced in size (reduced in power) and the drying time can be shortened. That is, if the external air is heated and then directly introduced, the dew point of the external air may be high depending on seasons, and a long drying time or a large heater may be required for drying the powder or granular material in the hopper main body, but in this embodiment, the process air whose dew point is lowered by the dehumidification treatment of the honeycomb rotor 31 is supplied into the hopper main body 21, whereby the powder or granular material m can be efficiently dehumidified and dried.

Further, since the dehumidification process of the process gas, the heating regeneration process of a part of the honeycomb rotor 31, and the cooling regeneration process of a part of the honeycomb rotor 31 are performed in parallel by continuously rotating the honeycomb rotor 31, the process gas having a stable dew point can be supplied into the hopper main body 21.

In the present embodiment, although air is used as the gas for dehumidification and drying, the gas containing moisture, for example, nitrogen, hydrogen, argon, or the like may be introduced into the drying hopper after dehumidification and drying, and the powder or granular material m may be dehumidified and dried.

The temperature and dew point of each gas blown through each path can be appropriately set in accordance with the type of the particulate material m subjected to the dehumidification drying process, the initial moisture, the capacity of the hopper main body 21, the output of each heater and each blower, the shape of the honeycomb rotor 31, and the like.

In particular, in the case of dehumidifying and drying synthetic resin particles or the like, which are desired to have a constant low water content, the dew point of the dehumidified process gas may be, for example, about-10 ℃ to about-60 ℃, and preferably about-40 ℃ to about-50 ℃.

In the present embodiment, the dehumidifying unit 30 has one end connected to the regenerating blower 35 via a heating gas path 37 and a regenerating heater 36, and the other end connected to an exhaust pipe 38, the heating gas path 37 and the exhaust pipe 38 are connected to each other via a heating regeneration region 32b, the drying apparatus 1 further includes a regenerating exhaust gas temperature sensor 43, the regenerating exhaust gas temperature sensor 43 is connected to the control unit 40, the regenerating exhaust gas temperature sensor 43 is provided on the exhaust pipe 38 side of the heating regeneration region 32b to detect a temperature of the process gas discharged from the heating regeneration region 32b, and the control unit 40 monitors drying performance of the drying apparatus 1 based on the temperature of the process gas. Specifically, the applicant has found that if the temperature of the process gas in the heating regeneration zone 32b is stably maintained above a certain temperature, the quality of the powder material m in the drying hopper 20 being dried can be ensured, whereas if the temperature of the process gas thereof is below a certain temperature, the quality of the powder material m in the drying hopper 20 being dried cannot be ensured, reflecting the low drying capacity of the drying apparatus 1. Therefore, the process gas temperature at the time of ensuring the quality of the powder material m in the drying hopper 20 to be dried (i.e., at the time of normal state) is measured as a reference value in advance, and the actual process gas temperature is dynamically monitored and compared with the reference value of the process gas temperature at any time in the daily drying process, so that the drying process flow and the like can be timely adjusted according to the monitored level of the drying capacity, thereby ensuring that the drying device 1 can maintain stable drying quality.

In the present embodiment, the drying apparatus 1 further includes a first temperature detection sensor 44 and a second temperature detection sensor 45 connected to the control unit 40. The first temperature detection sensor 44 is disposed near the exhaust port 25 of the drying hopper 20, specifically, at a position on the process gas return path 12 near the exhaust port 25. The second temperature detection sensor 45 is provided on the hopper body 21 at a position close to the exhaust port 25. The first temperature detection sensor 44 is configured to detect the temperature of the process gas from the vicinity of the exhaust port 25 of the drying hopper 20. A second temperature detection sensor 45 for detecting a material temperature of the powder or granular material in the drying hopper 20; the exhaust temperature and the material temperature are temperatures indicating a drying process state of the powder or granular material m in the hopper main body 21. The control unit 40 monitors the drying capacity of the drying device 1 based on at least one of the exhaust gas temperature and the material temperature. As a modification of the present embodiment, the drying apparatus 1 may not include the first temperature detection sensor 44 and the second temperature detection sensor 45 connected to the control unit 40.

The process gas supply path 11 is provided with a dew point detection sensor 46 for detecting the dew point of the process gas supplied to the heater 26, and the control unit 40 may monitor the drying capacity of the drying apparatus 1 based on the dew point detected by the dew point detection sensor 46 in addition to the process gas temperature.

The dehumidification unit 30 is provided with an operation state detection sensor 47 for detecting an operation state of the dehumidification unit 30, and the control unit 40 may monitor the drying capacity of the drying apparatus 1 based on the operation state of the dehumidification unit 30 detected by the operation state detection sensor 47 in addition to the gas processing temperature and the dew point. Specifically, the operation state detection sensor 47 may be provided on the honeycomb rotor 31 or on a driving portion of the honeycomb rotor 31. By monitoring the operation state of the dehumidifying unit 30, when an abnormal state of the operation state of the dehumidifying unit 30 is found, the drying process can be timely adjusted or the operation of the drying apparatus 1 can be suspended to ensure the drying quality.

As shown in fig. 2, the control unit 40 includes: a CPU41 for controlling the above-mentioned respective parts of the drying apparatus 1; an operation panel 42 constituting an operation mechanism, the operation panel 42 being operated to perform various settings or to set various setting temperatures, various reference values, and the like described later; the storage unit 48 stores a control program or the like for executing setting conditions set by the operation of the operation panel 42 or basic operations described later.

The CPU41 is connected to the above-described heater 26, main blower 15, regeneration heater 36, regeneration blower 35, rotary drive motor 39, regeneration exhaust gas temperature sensor 43, first temperature detection sensor 44, second temperature detection sensor 45, dew point detection sensor 46, and operation state detection sensor 47 via signal lines.

The drying apparatus 1 according to the present utility model has the following advantages.

(1) The dehumidification unit 30 has one end connected to the regeneration blower 35 via a heating gas path 37 and a regeneration heater 36, and the other end connected to an exhaust pipe 38, the heating gas path 37 and the exhaust pipe 38 are connected to each other via a heating regeneration region 32b, and the drying apparatus 1 further includes a regeneration exhaust gas temperature sensor 43, the regeneration exhaust gas temperature sensor 43 being connected to the control unit 40, the regeneration exhaust gas temperature sensor 43 being provided on the exhaust pipe 38 side of the heating regeneration region 32b to detect a temperature of the process gas from the heating regeneration region 32b, and the control unit 40 monitoring drying performance of the drying apparatus 1 based on the temperature of the process gas. Therefore, compared with the prior art, the change of heat loss of the powder and granular material in the drying device can be monitored, so that the drying capacity of the drying device can be maintained in a stable state to ensure the drying quality of the powder and granular material.

(2) The process gas supply path 11 is provided with a dew point detection sensor 46 for detecting the dew point of the process gas supplied to the heater 26, and the control unit 40 may monitor the drying capacity of the drying apparatus 1 based on the dew point detected by the dew point detection sensor 46 in addition to the process gas temperature. Therefore, the change in heat loss of the powdery and granular material in the drying apparatus can be monitored more accurately, and the drying capacity of the drying apparatus can be maintained in a stable state to ensure the drying quality of the powdery and granular material.

(3) The dehumidification unit 30 is provided with an operation state detection sensor 47 for detecting an operation state of the dehumidification unit 30, and the control unit 40 may monitor the drying capacity of the drying apparatus 1 based on the operation state of the dehumidification unit 30 detected by the operation state detection sensor 47 in addition to the process gas temperature and the dew point. By monitoring the operation state of the dehumidifying unit 30, when an abnormal state of the operation state of the dehumidifying unit 30 is found, the drying process can be timely adjusted or the operation of the drying apparatus 1 can be suspended to ensure the drying quality.

In the present embodiment, the honeycomb structure is used as the dehumidifying unit, and the adsorbent is one honeycomb rotor 31, but the present utility model is not limited thereto, and the dehumidifying unit may be a multi-tower structure having a plurality of adsorption towers, for example. Such a multi-tower structure is applicable to a structure in which the switching between the paths and the adsorption towers is performed by a switching valve, and a structure in which the adsorption towers are rotated relative to the paths so that the paths and the adsorption towers are sequentially and circularly connected, as long as the structure is provided with a process gas circulation path as in the present embodiment, and the process gas is dehumidified and supplied, and the regeneration process of the adsorbent is performed.

That is, in the present embodiment, the adsorbent disposed in correspondence with the dehumidification processing region, the heating regeneration region, and the cooling regeneration region is constituted by one honeycomb rotor 31, and the partition wall 32d is moved relative to the honeycomb rotor 31 by rotation of the honeycomb rotor, so that the respective regions are sequentially moved, and the dehumidification processing step of performing the dehumidification processing on the processing gas, the heating regeneration step of performing the heating regeneration on a part of the honeycomb rotor, and the cooling regeneration step of performing the cooling regeneration on a part of the honeycomb rotor are performed in parallel. On the other hand, in the multi-tower structure, the switching between the paths and the adsorption towers is performed by a switching valve, or the adsorption towers are rotated relative to the paths to sequentially form each of the regions, so that a dehumidification process step of dehumidifying a process gas, a heating regeneration step of heating and regenerating the adsorption towers, and a cooling regeneration step of cooling and regenerating the adsorption towers are performed.

With such a configuration, in the multi-tower type dehumidification unit, the same effect can be obtained by applying the present embodiment, although the same effect is inferior in the constancy of the dew point as compared with the honeycomb type dehumidification unit used in the present embodiment.

In the case of using the multi-tower type dehumidification unit, for example, in the case of controlling the timing of the switching by a timer, the timer for the switching may be temporarily stopped during the time from the start to the expiration of the timer for counting the first time. This can prevent switching from being performed when regeneration is not yet sufficiently performed.

Alternatively, the dehumidifying unit may be configured to include a plurality of honeycomb rotors. For example, a plurality of honeycomb rotors may be arranged in parallel to each path. In this case, the present utility model can be applied by branching each path to each region of the plurality of honeycomb rotors.

Alternatively, the drying device may be configured to include a plurality of dehumidification units. For example, a plurality of dehumidification units may be arranged in parallel to the drying hopper. In this case, the present utility model can be applied by branching the process gas return path 12 and connecting it to the honeycomb rotor of each dehumidification unit, and branching the process gas supply path 11 and connecting it to the honeycomb rotor of each dehumidification unit.

Claims (3)

1. A drying device for powder and granular materials, comprising:

a drying hopper which accommodates a powder or granular material and has an air inlet and an air outlet, wherein the powder or granular material accommodated therein is dried by hot air entering through the air inlet and then discharged from the air outlet; and

the heater is communicated with the air inlet of the drying hopper through a hot air pipe; and

a dehumidifying unit which communicates with a process gas suction port of the heater through a process gas supply path; and

a blower which communicates with the dehumidification unit through a process gas return path,

the process gas supplied to the heater by the blower through the process gas return path, the dehumidification unit, and the process gas supply path is heated by the heater, then supplied into the drying hopper through the hot air pipe, dried to dry the powder or granular material in the drying hopper, discharged from the exhaust port of the drying hopper, and returned to the blower through the process gas return path,

one end of the dehumidification unit is communicated with the regenerating blower through a heating gas path and the regenerating heater, the other end of the dehumidification unit is communicated with the exhaust pipe,

the heating gas path and the exhaust pipe are communicated through a heating regeneration area, characterized in that,

the drying device also comprises a regeneration exhaust temperature sensor and a control device connected with the regeneration exhaust temperature sensor,

the regeneration exhaust temperature sensor is provided on the exhaust pipe side of the heating regeneration region, and detects the temperature of the process gas from the heating regeneration region,

the control device monitors a drying capacity of the drying device based on the process gas temperature.

2. A drying apparatus for powder or granular material according to claim 1,

the process gas supply path is provided with a dew point detection sensor for detecting a dew point of the process gas supplied to the heater,

the control device monitors the drying capacity of the drying device based on the dew point detected by the dew point detection sensor.

3. A drying apparatus for powder or granular material according to claim 1 or 2,

the dehumidifying unit is provided with an operation state detection sensor for detecting the operation state of the dehumidifying unit,

and monitoring the drying capacity of the drying device based on the operation state of the dehumidifying unit detected by the operation state detection sensor.

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