JP3773673B2 - Method and apparatus for dehumidifying and drying granular material using carrier gas replacement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dehumidifying and drying method and apparatus for a granular material using carrier gas substitution that can efficiently dehumidify and dry a granular material in a short time.
[0002]
[Prior art]
Conventionally, as a dehumidifying and drying device for granular material, the granular material is stored in a drying hopper and heated and dried air is vented to dehumidify and dry the granular material. Many drying methods and equipment were used.
FIG. 6 is a diagram showing an example of such a granular material aeration type dehumidifying and drying apparatus.
[0003]
This aeration type dehumidifying and drying apparatus D includes an aeration type drying hopper 101 that accommodates a granular material such as resin pellets to be dried, a hot air supply means 102 provided attached to the aeration type drying hopper 101, and an aeration type A diffuser cone 103 provided in the drying hopper 101, an air supply pipe 104 that connects the diffuser cone 103 and the hot air supply means 102, and an exhaust gas that connects the ventilation-type drying hopper 101 and the hot air supply means 102. And a gas recovery pipe 105.
[0004]
The ventilating drying hopper 101 is provided in a cylindrical straight body portion 101a, a conical shape portion 101b that tapers downward toward the lower portion thereof, and a central portion of the conical shape portion 101b. A discharge pipe 101c that discharges the powdered and granulated material from the inside of the ventilation-type drying hopper 101, a material input port 101f provided in a central portion 101e of an upper portion (top plate) 101d, and an upper portion ( An air discharge port 101g provided on the side of the material input port 101f of the top plate 101d is provided.
[0005]
A material storage hopper 106 in which the granular material to be dried is stored is provided above the material input port 101 f of the ventilation type dry hopper 101 with a material input valve 107 interposed therebetween.
A material transport pipe (not shown) and a material input port (not shown) such as a molding machine are connected to the lower side of the discharge pipe 101c of the ventilating drying hopper 101.
[0006]
The hot air supply means 102 includes a heating means (not shown) for heating and drying air and the like, a blower means (not shown) such as a blower for supplying hot air into the ventilation type drying hopper 101, and the like. Yes.
One end 103a of the diffuser cone 103 is connected to the air supply pipe 104 connected to the hot air supply means 102 on the side of the straight body portion 101a of the ventilation type drying hopper 101, and the lower part 103b thereof is connected to the ventilation type. The drying hopper 101 is provided in the upper central portion in the vicinity of the discharge pipe 101c, and an opening for diffusing and supplying hot air supplied from the hot air supply means 102 into the ventilation type drying hopper 101 in the lower portion 103b. A plurality of small holes 103d are formed in the outer peripheral surface on the outer side of the portion 103c and the opening 103c.
[0007]
Further, the exhaust gas recovery pipe 105 is provided so as to connect between the air exhaust port 101g provided in the upper part (top plate) 101d of the ventilation type dry hopper 101 and the hot air supply means 102. The hot air generated by the hot air supply means 102 is diffused and supplied into the ventilating drying hopper 101 through the openings 103c in the lower portion 103b of the diffuser cone 103 and a plurality of small holes 103d formed on the outer peripheral surface thereof. After that, the hot air supply means 102 is circulated to the hot air supply means 102 through the air discharge port 101g and the exhaust gas recovery pipe 105 provided in the upper part (top plate) 101d of the ventilation type dry hopper 101, and is dried by the hot air supply means 102. It is regenerated into hot air and circulated and circulated into the ventilating drying hopper 101.
[0008]
When a predetermined amount of granular material is dried using the hopper dryer D, first, a predetermined amount of granular material stored in the material storage hopper 106 with the material input valve 107 opened for a predetermined time. The material is contained in a ventilated drying hopper 101. Next, the hot air supply means 102 is operated to blow hot air at a predetermined temperature into the granular material accommodated in the ventilating drying hopper 101, so that the granular material accommodated in the aerated drying hopper 101 is discharged. dry. This aeration-type dehumidifying and drying method blows hot air into the granular material, heats the granular material with the heat of the hot air, and takes out moisture and volatile components of the granular material through the hot air. Dehumidified and dried.
[0009]
The granular material after the drying process is passed through a material input port (not shown) such as a material transport pipe (not shown) connected to the discharge pipe 101c from the discharge pipe 101c of the ventilated drying hopper 101 or a molding machine. ) In turn.
[0010]
[Problems to be solved by the invention]
However, in this conventional vent type dehumidifying and drying apparatus, the heated and dried hot air is continuously blown into the granular material stored in the vent type drying hopper 101, heated and dehumidified and dried. The hot air supply means 2 that generates an air volume that always flows through the hopper 101 is necessary, and the hot air supply means 2 has been enlarged.
[0011]
In addition, in this conventional aeration type dehumidifying and drying apparatus, since heating and dehumidifying drying are simultaneously performed by aeration, in general, it is possible to take out moisture and the like from the granular material by hot air in a short time. In spite of the fact, it takes time to heat the granular material with hot air, so that there is a problem that the entire processing time is also restricted by the time of hot air heating.
[0012]
The present invention provides a method and apparatus for dehumidifying and drying granular material, which eliminates the above-mentioned conventional problems, eliminates the need for large heating means, can efficiently perform dehumidification drying in a short time, and can be downsized. It is aimed.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention proposes a dehumidifying and drying method and apparatus for a granular material using the inventive concept of carrier gas replacement.
With this carrier gas replacement, in the conventional dehumidifying drying method and apparatus of the aeration type, heating and dehumidifying drying of the powdered material were treated as one, but heating and dehumidifying drying were separated. It is characterized by that. And dehumidification drying replaces the gas containing miscellaneous gas such as water vapor and volatile gas generated from the granular material in the drying hopper by heating or the like with the prepared carrier gas such as humidity and temperature. By doing so. Therefore, this method is called carrier gas replacement.
[0014]
Here, claims 1 and 2 propose a method for dehumidifying and drying a granular material using carrier gas substitution, and claims 3 to 6 propose the apparatus. That is, the dehumidifying and drying method of the granular material using the carrier gas replacement according to claim 1 is:The drying hopper for storing and drying the granular material has a structure in which a heating means is provided on the outer periphery of the heat conduction wall formed of a material having good thermal conductivity, and the drying hopper for storing and drying the granular material. Is formed of a material with good thermal conductivity, and is provided with a heat conduction cylinder having a built-in heating means, and the heat conduction wall extends a plurality of partition walls toward the inside, Each upper end is formed with an upper oblique notch that is inclined downward with the center of the internal space as a valley, and each lower end is formed with a lower oblique notch that is inclined downward with the center as a valley, and The heat conduction cylinder has a plurality of partition walls extending from the central portion of the drying hopper toward the inner wall, and the partition wall has an upper end portion that is downward toward the periphery with the central portion as a top portion. Forming a protruding piece end that slopes Made using the dehumidifying and drying apparatus for powdered or granular material is in the structure formed outs lower beveled inclined downwardly toward the periphery of the center of the lower end drying hopper as the top, theAfter storing the granular material in the dry hopper, heat or decompression of the stored granular material is performed in a state where the dry hopper is sealed, thereby removing miscellaneous gases such as water vapor and volatile gas. While generating, introduce the carrier gas prepared in humidity, temperature, etc. into the drying hopper from the outside, and lead the gas containing the miscellaneous gas out of the drying hopper to dehumidify and dry the granular material. It is characterized by doing.
[0015]
Here, the carrier gas refers to a gas supplied from the outside into the drying hopper, and is set to a predetermined temperature, and is instead discharged from the granular material to be dried or from the drying hopper. It is desirable that the gas has a lower humidity than the gas and a lower concentration of impurities. Moreover, it is not restricted to what is called air and air | atmosphere, Gases, such as nitrogen gas, are also contained as a component according to the dehumidification drying aspect match | combined with the kind of granular material of drying object.
[0016]
The heating method is not limited as long as it is other than the ventilation type. Depressurization means that the drying hopper is depressurized below the atmospheric pressure, and the degree of decompression, in other words, the degree of vacuum is appropriately set according to the type of granular material to be dried and the dryness requirement. Is done.
With such carrier gas replacement, the granular material can be dehumidified and dried with a carrier gas amount that is several times the actual air amount in the drying hopper excluding the volume of the stored granular material, and the real air Compared to a ventilation type dehumidifying and drying apparatus that requires hot air that is several tens of times the amount, the amount of gas required for dehumidifying and drying can be greatly reduced, and the apparatus can be downsized. Further, dehumidification and drying can be efficiently performed in a short time.
[0017]
The method for dehumidifying and drying a granular material using carrier gas replacement according to claim 2 is the method according to claim 1, wherein the carrier material is heated while the granular material is heated by a heat conduction heating means provided in the drying hopper. Gas is introduced from the outside, and the gas containing the miscellaneous gas is led out of the drying hopper.
This method is characterized in that a heat conduction heat means is used as the heating means.
[0018]
With this heat conduction heating means, the drying hopper itself is made of a heat conductive material, and on the inner wall, a partition wall made of the same material is extended toward the inside so that the outer periphery of the drying hopper Heat from the provided heating means (heat generation source) is conducted and transferred to heat the powder material inside.
In other words, by actively using the thermal conductivity of the material, there is no need to provide complicated heating means inside the drying hopper, the hopper internal structure becomes a simple structure with only a vertically extending partition wall, and the material Because it uses the thermal conductivity, gentle and uniform heating can be achieved. Further, by providing as many partition walls as possible, the heat transfer efficiency is improved by widening the heat transfer area for transferring the conduction heat to the powder material.
[0019]
According to the dehumidifying and drying method of the granular material using this carrier gas replacement, the effects of both are exhibited synergistically by combining with such heat conduction heating means. The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 3 stores a drying hopper for storing and drying the granular material, and heating for heating the granular material stored in the drying hopper. Means, an introduction port for introducing a carrier gas prepared in the humidity, temperature, etc. from the outside into this drying hopper, and a gas containing miscellaneous gases such as water vapor and volatile gas generated in this drying hopper to the outside In the dry hopper, while the dry hopper is sealed, the stored granular material is heated to generate miscellaneous gases such as water vapor and volatile gas. Dehumidifying and drying the particulate material by introducing a carrier gas prepared for humidity, temperature, etc. from the outside and deriving the gas containing the miscellaneous gas to the outside of the drying hopperAnd
The drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material with good thermal conductivity, and is formed with a material with good thermal conductivity inside the drying hopper. The built-in heat conducting cylinder is provided, and the heat conducting wall has a plurality of partition walls extending inward, and each upper end is inclined downward with the center of the internal space as a valley. An upper diagonal notch and a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the thermal conduction cylinder has a plurality of partition walls and a center of the drying hopper. The partition wall extends from the portion toward the inner wall, and the partition wall forms a projecting end that slopes downward toward the periphery with the center portion at the top, and the lower end portion is the center of the drying hopper. Around as the top Is a structure formed outs lower beveled inclined selfish downwardIt is characterized by that.
[0020]
The apparatus includes only a heating means for the granular material, and the dehumidifying and drying method combining heating performed under atmospheric pressure or under positive pressure and carrier gas replacement in the dehumidifying and drying method according to claim 1. It is an apparatus which implement | achieves and can demonstrate the effect of the method of Claim 1. The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 4 comprises a drying hopper for storing and drying the granular material, a depressurizing means for depressurizing the inside of the drying hopper, and a drying hopper. In addition, there are an inlet for introducing a carrier gas prepared such as humidity and temperature from the outside, and a gas discharge means for deriving a gas containing miscellaneous gases such as water vapor and volatile gas generated in the drying hopper to the outside. In the state where the dry hopper is sealed, the stored granular material is decompressed to generate miscellaneous gases such as water vapor and volatile gas, while the dry hopper has humidity and temperature. The prepared carrier gas is introduced from the outside, and the powdered material is dehumidified and dried by deriving the gas containing the miscellaneous gas to the outside of the drying hopper.In addition, the drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material having good heat conductivity, and is formed of a material having good heat conductivity inside the drying hopper. The heat conduction wall is provided with a built-in heating means, and the heat conduction wall has a plurality of partition walls extending toward the inside. And forming a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the heat conducting cylinder includes a plurality of partition walls, The partition wall extends from the center portion of the drying hopper toward the inner wall, and the partition wall forms a protruding piece end whose upper end portion is inclined downward with the center portion as a top portion, and the lower end portion is dried. With the center of the hopper at the top Is a structure formed outs lower beveled inclined downwardly toward the periphery TeIt is characterized by that.
[0021]
2. The apparatus according to claim 1, wherein the apparatus comprises only a depressurizing means of a drying hopper, and implements a dehumidifying and drying method that combines a depressurizing process and carrier gas replacement in the dehumidifying and drying method according to claim 1. The effect of can be demonstrated. The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 5 is a drying hopper for storing and drying the granular material, and heating for heating the granular material stored in the drying hopper. Means and pressure reducing means for depressurizing the inside of the drying hopper, an introduction port for introducing a carrier gas adjusted in humidity, temperature, etc. from the outside to the drying hopper, water vapor or volatile gas generated in the drying hopper, etc. Gas discharge means for deriving a gas containing various other gases to the outside, and heating and decompression treatment of the stored granular material material in a state where the dry hopper is hermetically sealed, thereby allowing water vapor and volatile gas While generating miscellaneous gas, etc., the carrier gas prepared for humidity, temperature, etc. is introduced from the outside into the drying hopper, and the gas containing the miscellaneous gas is introduced to the outside of the drying hopper. By drying dehumidifying granular materialIn addition, the drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material having good heat conductivity, and is formed of a material having good heat conductivity inside the drying hopper. The heat conduction wall is provided with a built-in heating means, and the heat conduction wall has a plurality of partition walls extending toward the inside. And forming a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the heat conducting cylinder includes a plurality of partition walls, The partition wall extends from the center portion of the drying hopper toward the inner wall, and the partition wall forms a protruding piece end whose upper end portion is inclined downward with the center portion as a top portion, and the lower end portion is dried. With the center of the hopper at the top Is a structure formed outs lower beveled inclined downwardly toward the periphery TeIt is characterized by that.
[0022]
This apparatus comprises both a heating means for granular material and a decompression means for a drying hopper, and a dehumidification drying method combining heating and decompression treatment and carrier gas replacement in the dehumidification drying method according to claim 1. The effect of the method of claim 1 can be exhibited more efficiently.
The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 6 is characterized in that, in any of claims 3 and 5, the heating means of the drying hopper is a heat conduction heating means. To do.
[0023]
This device is characterized in that the heating means is a heat conduction heating means, and the hopper internal structure has a simple structure with only a partition wall extending vertically, and uses the thermal conductivity of the material, The effect of the heat conduction heating means that the gentle and uniform heating can be performed and the heat efficiency is good and the effect of the carrier gas replacement are synergistically exhibited.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a dehumidifying and drying apparatus for granular material according to the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram showing an overall configuration of an example of a dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention, and FIG. 2 is a diagram of the dehumidifying and drying apparatus for granular material according to an embodiment of the present invention. The external appearance of a main-body part is shown, (a) is the partially cutaway front view, (b) is the side view.
[0025]
A dehumidifying and drying apparatus A shown in FIG. 1 is a floor-standing type, and a drying hopper 1 provided with a heat conductive wall 2 formed in a cylindrical shape and heating means 3 provided on the outer periphery thereof is attached to a machine base 1a. The roller 1b is provided at the lower part of the machine base 1a so as to be movable.
The drying hopper 1 is provided with a nozzle 21, a collector 22, a material input valve 23, and a material discharge valve 24 provided in a material tank or the like. The granular material that is sequentially supplied to the drying hopper 1 for dehumidification drying is sucked by the nozzle 21 and collected in the collector 22, and the granular material in the drying hopper 1 is collected by the material charging valve 23. In the drying hopper 1, the dehumidified and dried granular material is discharged from the material discharge valve 24 disposed in the lower part to the next step, such as a resin molding machine. .
[0026]
In this dry hopper 1, a level gauge (LV) 14 for detecting the amount of the granular material in the hopper is disposed, and a vacuum pump (VP) 27 for evacuating the hopper. Is installed on the machine base 1a and is connected to the upper side of the drying hopper 1 by a pipe. The pipe includes a vacuum sensor (PS) 26 for detecting a predetermined degree of vacuum, a filter 25 for filtering a sucked gas, A valve 28 for returning the inside of the drying hopper 1 to the atmospheric pressure and a pressure gauge (PG) 28a for measuring the degree of vacuum or the degree of pressure reduction in the drying hopper 1 are connected.
[0027]
In the dehumidifying and drying apparatus A, the vacuum pump (VP) 27 constitutes a decompression means for generating miscellaneous gases such as water vapor and volatile gas from the granular material, and a drying hopper containing the miscellaneous gases. It also serves as a gas discharge means for deriving the gas inside.
In addition, an inlet 29 comprising a valve 29a for introducing carrier gas for carrier gas replacement and an adjusting valve 29b for adjusting the introduction amount is connected to the lower side, and a lower end of the material discharge valve 24 is connected to the lower end. The air blowing side of the material transport blower (B) 30 is connected via a transport switching valve 31.
[0028]
A transport filter 32 for filtering transport air is connected to the suction side of the material transport blower 30, and transport exhaust from a resin molding machine, which is the next process, is connected to the transport filter 32 via a switching valve 34. Alternatively, the transportation exhaust from the collector 22 is selectively connected. The machine base 1a is further provided with a control panel 33 for controlling the entire dehumidifying and drying apparatus A.
[0029]
The internal structure of the drying hopper 1 will be described later.
As shown in FIGS. 2 (a) and 2 (b), the main body of the dehumidifying and drying apparatus for the granular material material including the drying hopper 1 is disposed at the upper portion of the drying hopper 1 with a collector 22 through a material charging valve 23. The material discharge valve 24 is disposed in the lower part. A discharge side of the discharge valve 24 is connected to a blower side of the transport blower 30 via a transport switching valve 31 so as to be connectable and disconnectable.
[0030]
The vacuum pump (vacuum pump) 27 is disposed on the side of the transport blower 30, the transport filter 32 is disposed on the upper side, and the control panel for controlling the entire apparatus is further disposed on the upper side. 33 is arranged.
As described above, the dehumidifying / drying apparatus A is convenient because it can be used in a place where it is desired to use since the related devices are compactly installed and movable on the machine base 1a.
[0031]
In the particulate dehumidifying and drying apparatus A using carrier gas replacement, the transport switching valve 31 is switched to open the air blowing side of the transport blower 30, while the switching valve 34 is switched to the collector 22 side for transport. The suction side of the blower 30 is connected to the collector 22, and the particulate material is collected in the collector 22 via the nozzle 21.
Next, when the granular material is charged and stored in the drying hopper 1 until the level gauge 14 emits a signal from the collector 22, the material charging valve 23 is closed and the airtightness in the drying hopper 1 is maintained. Then, the heated granular material is heated by the heating means 3, and the granular material is decompressed while the inside of the dry hopper 1 is depressurized to a predetermined degree of decompression by the vacuum pump 27. To do.
[0032]
If it carries out like this, the water | moisture content currently hold | maintained from the granular material will generate | occur | produce as water vapor | steam, and a volatile component will generate | occur | produce as volatile gas.
At this time, water vapor and volatile gas are generated from the granular material only by heating, but depending on the material, there are materials that deteriorate when heated to a very high temperature. When performed, the boiling point of water or the like is lowered, and evaporation or volatilization can be performed at a lower temperature. Moreover, you may perform a decompression process together in order to accelerate | stimulate evaporation and volatilization as needed.
[0033]
On the other hand, water vapor and volatile gas are generated only by the decompression process. Normally, powder materials such as resin pellets are heated to a predetermined temperature due to processing requirements in the resin molding machine, which is the next process. Therefore, heating is often performed together.
In this way, while generating miscellaneous gases such as water vapor and volatile gas in the drying hopper 1, the dehumidifying and drying apparatus A introduces a carrier gas adjusted in humidity, temperature, etc. from the inlet 29 and simultaneously drys it. The gas containing the miscellaneous gas in the hopper 1 is sucked out by the vacuum pump 27 and led to the outside of the drying hopper 1, so that the granular material is dehumidified and dried.
[0034]
Specifically, here, the normal atmosphere is used as the carrier gas, the adjustment valve 29b of the inlet 29 is adjusted, and the outside air is introduced while the vacuum pump 27 is dried by the amount of the introduced atmosphere. The gas in the hopper 1 is sucked and a predetermined pressure reduction degree is maintained by the pressure gauge 28a.
Thus, when dehumidifying and drying using carrier gas replacement, the dehumidifying and drying of the granular material is performed with a carrier gas amount that is several times the actual air amount in the drying hopper excluding the volume of the stored granular material. The amount of gas required for dehumidifying and drying can be greatly reduced as compared with a ventilation type dehumidifying and drying device that requires hot air that is several tens of times the actual amount of air, and the size of the device can be reduced. In addition, dehumidification drying can be done efficiently in a short time.
In addition, if a filter, a dryer, a heating means, etc. is installed in front of the inlet 29 to remove dust, and a carrier gas obtained by further drying the atmosphere is introduced, the air is further dehumidified and dried. Can do. Furthermore, a gas that does not adversely affect the material can be used as the carrier gas in accordance with the type of the granular material.
[0035]
After dehumidifying and drying in this way, the outside air is introduced by the valve 28 to return the atmospheric pressure in the drying hopper 1 to the same atmospheric pressure as the outside, and then the material discharge valve 24 is opened in response to a request from the next process. The dehumidified and dried granular material is discharged, the switching valve 34 is switched to the resin molding machine side, the transport switching valve 31 is switched, and the transport blower 30 supplies the granular material to the resin molding machine in the next step. transport. Moreover, the granular material which should be dehumidified and dried is supplied to the drying hopper 1 from the collector 22 as needed.
[0036]
When the powder material is discharged and charged, the inside of the drying hopper 1 is returned to the atmospheric pressure. If the inside of the drying hopper 1 remains in vacuum, the material discharge valve 24 is opened due to a pressure difference with the outside. This is because sometimes the outside air vigorously flows into the dry hopper 1 and destroys the laminated state of the powder material inside. Therefore, when the collector 22 is kept in vacuum and the front and back of the material input valve 23 and the material discharge valve 24 are maintained at the same atmospheric pressure, it is returned to the atmospheric pressure when the granular material is discharged and charged. No steps are necessary.
[0037]
Next, the heat conduction heating means used in the present invention will be described.
FIG. 3 shows a drying hopper of a dehumidifying and drying apparatus according to an embodiment of the present invention provided with this heat conduction heating means, wherein (a) is a plan view thereof and (b) is a longitudinal sectional view thereof.
As shown in FIGS. 3A and 3B, this drying hopper 1 is provided with a cylindrical heat conduction wall 2 formed of a material having good thermal conductivity such as an aluminum material on the outer periphery of the drying hopper 1. In addition, an external heating means 3 composed of a band heater is provided on the outer periphery thereof, and a heat conduction cylinder 4 made of a material having good heat conductivity such as an aluminum material is provided inside the drying hopper 1, and a pipe is provided at the center thereof. An internal heating means 5 composed of a heater is incorporated. The shape of the heat conduction wall 2 of the heating hopper 1 is preferably cylindrical, but may be an elliptical cylinder, a rectangular cylinder, or the like.
[0038]
The heat conduction wall 2 has a plurality of partition walls 6 arranged in the vertical direction extending radially inward and substantially at the same thickness toward the inner center side. The partition walls 7 arranged in the vertical direction are radially extended from the center toward the heat conducting wall 2 constituting the inner wall with substantially the same thickness and at substantially the same interval. It is advisable to provide an appropriate interval between the tip portions facing each other so that the powder material does not stop or abut against each other.
[0039]
In this way, a small section partitioned by the heat conducting wall 2, the heat conducting cylinder 4, and the partition walls 6 and 7 is generated. The sectional areas of the small sections are substantially equal, and the conduction heat from the heat conducting wall 2 and the like is The powder is uniformly transmitted to the granular material inside the small compartment. Further, as many partition walls 6 and 7 as possible are provided, the surface area for heat conduction is increased, and the heat conduction efficiency is improved. Furthermore, the partition walls 6 and 7 have a predetermined thickness so that heat applied to the heat conduction wall 2 and the like is transmitted to the ends of the partition walls 6 and 7 without temperature unevenness in consideration of the thermal conductivity of the material. Have
[0040]
As described above, it is desirable that the partition wall of the drying hopper extends radially from the outside to the inside and radially from the inside to the outside. Any partition wall may be used as long as it is thermally conductive to the body material as uniformly as possible without temperature unevenness. In addition, the partition walls 6 and 7 do not necessarily have to have substantially the same thickness and extend at substantially the same interval, and the sectional areas of the small sections do not necessarily have to be substantially equal.
[0041]
Here, when the thermal conductivity of the material constituting the dry hopper 1 is compared, in the case of 20 degrees Celsius, the carbon steel conventionally used for the dry hopper is 37 Kcal / mhr ° C., and the stainless steel is about 20 Kcal / On the other hand, the aluminum recommended in this application has a marked difference of 175 Kcal / mhr ° C. Pure copper is excellent in terms of 360 Kcal / mhr ° C. and thermal conductivity, but the material unit price and direct contact with the powder material may adversely affect the material, so appropriate coating treatment is required. For this reason, there are many problems to be solved in order to adopt this.
[0042]
The heat conduction wall 2, the external heating means (heat generation source) 3, the heat conduction cylinder 4, the internal heating means (heat generation source) 5, and the partition walls 6, 7 constitute the heat conduction heating means. Yes.
Each upper end of the partition wall 6 extending from the heat conducting wall 2 toward the inner center side forms an upper oblique notch 61 that inclines downward with the inner center side as a valley portion. A lower oblique notch 62 is formed with a lower oblique notch 62 inclined downward with the central side as a valley.
[0043]
In addition, the partition wall 7 of the heat conducting cylinder 4 has a projecting piece end 71 formed at the upper end thereof downward with the central portion at the top and the lower end toward the periphery with the center of the hopper as the top. A lower oblique notch 72 that is inclined downward is formed.
The heat conduction wall 2 is cylindrical and forms the main body of the drying hopper 1, and the hopper upper lid portion 8 is disposed on the heat conduction wall 2, and the lower portion is inclined so as to be squeezed downward toward the center side. The hopper lower taper portion 9 is disposed and fixed by mounting bolts (not shown). The heat conducting cylinder 4 is supported and fixed in a suspended state at the center of the pipe 10 spanned between the inner walls of the lower reinforcing frame 81 of the hopper upper lid section 8.
[0044]
Moreover, the umbrella part 12 is attached and fixed to the lower part of the internal side heating means 5 which consists of a pipe heater.
Further, the hopper lower taper portion 9 has a shape in which a hollow portion 91 is formed in the inner peripheral portion, and a band heater as a heating means may be further provided in the hollow portion 91.
[0045]
Further, the lower part of the partition wall 7 on the center side is supported by the lower part of the partition wall 6 on the outer periphery side via a ring body 13, and the ring body 13 has a material on its upper end surface. If the upper end surface is chamfered to a certain degree, the granular material does not stay.
According to the drying hopper provided with such a heat conduction heating means, the granular material supplied into the drying hopper 1 includes the external heating means 3 provided on the outer periphery of the heat conduction wall 2 and the inner heat conduction. The heat conduction wall 2, the heat conduction cylinder 4, and the partition walls 6 and 7 respectively heated by the internal heating means 5 provided at the center of the cylinder 4 are indirectly and gently free of temperature unevenness. , Heated and uniformly dehumidified and dried. In addition, the granular material in the small compartments partitioned by the heat conduction wall 2, the heat conduction cylinder 4, and the partition walls 6 and 7 is efficiently converted by the heat conduction from the surface such as the heat conduction wall 2 surrounding the material. Heated.
[0046]
Furthermore, since the upper end of the outer partition wall 6 is formed in the upper oblique notch 61 and the inner partition wall 7 is formed in the projecting piece end 71, when the powder material is put in from above, these upper end surfaces Therefore, the powder material can be uniformly distributed and filled in the partition walls 6 and 7 without difficulty. Further, since the lower ends of the partition walls 6 and 7 are formed in the lower oblique notches 62 and 72, it is convenient to provide the first-in first-out umbrella part 12, and the heat conduction area is widened to improve the heat conduction efficiency. ing.
[0047]
Further, the lower diagonal notches 62 and 72 are determined according to the shape of the lower part of the hopper where the partition wall is close, the shape of the first-in first-out umbrella body, etc. The goal is to increase the heat conduction area. Therefore, depending on the required degree of the heat conduction area, it is not always necessary to provide a notch that follows the mating shape.
[0048]
The upper oblique notch 61 and the projecting piece end 71 are for preventing retention of the granular material, and the upper oblique notch 61 or the like is not necessarily provided as long as the same function is exhibited. Good. For example, the upper end surfaces of the partition walls 6 and 7 may be horizontal, and chamfering or R chamfering may be provided so that the granular material does not stay.
[0049]
In addition, conventionally used heating means such as a copper heat pipe may adversely affect the granular material to be heated. However, it constitutes the dry hopper 1 of the present invention and directly forms the granular material. The heat conduction wall 2, the heat conduction cylinder 4, and the partition walls 6 and 7 that are in contact with the material are made of a material that does not adversely affect the granular material during heating, such as an aluminum material. There is nothing wrong.
[0050]
In addition, it is preferable that the dry hopper 1 is formed of an aluminum material, and the surface thereof is preferably subjected to surface hardening treatment such as alumite. Thus, when the surface is subjected to surface hardening treatment such as alumite, the material becomes There are fewer adverse effects, and it has the advantage of being durable and lasting longer.
Moreover, the heating means 3 and 5 may be provided with a nichrome heater or a ceramic heater on the heat conducting wall 2 and the heat conducting cylinder 4, and these may be partially provided and partially heated.
[0051]
Furthermore, when using the aluminum material etc., it is good for the drying hopper 1 to use what shape | molded the shape of the heat conductive wall or the partition wall simultaneously using the extrusion type | mold material or the drawing type | mold material. If it does in that way, it will be finished in the thing where the surface state is smooth, and granular material will not adhere to the surface, but granular material will move from the upper part of a dry hopper to the lower part smoothly.
[0052]
4A and 4B are conceptual diagrams for explaining a mode of carrier gas replacement according to the present invention. FIG. 4A shows a case of a vacuum state, and FIG. 4B shows a case of atmospheric pressure or positive pressure.
The dehumidifying and drying apparatus for granular material shown in FIG. 4 (a) is the same as that described with reference to FIGS. 1 and 2, and performs carrier gas replacement while performing decompression processing.
[0053]
A filter-introducing inlet 35 is provided at the bottom of the drying hopper 1 via a pipe, and a vacuum pump 36 is provided above the hopper 1 via a pipe.
According to this, the carrier gas replacement is performed by gradually introducing the outside air, which is the carrier gas, from the inlet 35 with a filter while the vacuum pump 36 is in a vacuum state or a reduced pressure state in the hopper 1.
[0054]
In this case, when the dehumidified and dried granular material is not subject to heating, a heating means may be omitted.
The dehumidifying / drying apparatus for granular material shown in FIG. 4 (b) is a case where the drying hopper is not provided with a pressure reducing means, and only a heating means is provided, and the carrier gas is replaced under atmospheric pressure or positive pressure. It is.
[0055]
A structure in which an inlet 37 composed of a blower and an on-off valve is provided at the bottom of the drying hopper 1, a gas discharge means 38 with a filter is provided above the drying hopper 1, and a heating means 39 is further provided. It is said.
This dehumidifying / drying device performs dehumidification drying while heating in an atmospheric pressure state. According to this, the inside of the drying hopper 1 is in an atmospheric pressure state or a pressurized air is supercharged by a blower. The carrier gas is replaced by discharging the gas in the dry hopper 1 by the gas discharge means 38 by the amount of the supplied air while maintaining the state.
[0056]
Note that the filter is not essential and may not be provided. In addition, it is desirable from the carrier gas replacement flow that the outside air intake port with filter 35 and the air supply / intake port 37 are provided at the bottom of the drying hopper 1 and the vacuum pump 36 and the release valve 38 are provided above the hopper 1. However, it is not necessarily limited to this.
FIG. 5 is a system diagram showing the overall configuration of another example of the dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention.
[0057]
This dehumidifying / drying apparatus B is an on-machine type, and is used by being directly mounted on a material hopper of a resin molding machine, which is the next process. In addition, about the same part as the dehumidification drying apparatus of FIG. 1, the same code | symbol is attached | subjected and duplication description is abbreviate | omitted.
This dehumidifying and drying apparatus B collects the granular material from the nozzle 21 of the material tank into the hopper 22A of the collector equipped with suction means, passes through the material input valve 23, and enters the granular material into the drying hopper 1. Is to be supplied.
[0058]
The granular material that has been dehumidified and dried by using carrier gas replacement in the drying hopper 1 is directly supplied to the injection molding machine from the material discharge valve 24 disposed in the lower part.
In the drying hopper 1, a level gauge 14 for detecting the volume of the granular material in the drying hopper 1 is disposed, and a vacuum pump 27 for evacuating the drying hopper 1 is provided at the top. A pressure sensor 25, a valve 28, and a pressure gauge 28a are connected to the pipe.
[0059]
In addition, an inlet 29 for introducing outside air for carrier gas replacement is connected to the lower side.
As described above, the dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention can also be configured as an on-board mold.
[0060]
【The invention's effect】
According to the method for dehumidifying and drying granular material using carrier gas replacement according to claim 1, the amount of carrier gas is about several times the actual amount of air excluding the volume of granular material stored in the drying hopper. Compared with aeration-type dehumidifying and drying equipment that can dehumidify and dry the granular material and requires hot air that is several tens of times the actual air volume, the amount of gas required for dehumidifying and drying can be greatly reduced. The device can also be miniaturized. Further, dehumidification and drying can be efficiently performed in a short time.
[0061]
According to the method for dehumidifying and drying granular material using carrier gas replacement according to claim 2, in addition to the effect of the method for dehumidifying and drying granular material using carrier gas replacement according to claim 1, heat conduction Since the heating means is used, there is no need to provide complicated heating means inside the drying hopper, the hopper internal structure becomes a simple structure consisting only of a partition wall extending vertically, and the thermal conductivity of the material is utilized. Therefore, gentle and uniform heating is possible. Further, by providing as many partition walls as possible, the heat transfer efficiency is improved by widening the heat transfer area for transferring the conduction heat to the powder material.
[0062]
According to the dehumidifying and drying apparatus for a granular material using carrier gas replacement according to claim 3, the apparatus includes only a heating means for the granular material, and among the dehumidifying and drying methods according to claim 1, Or it is an apparatus which implement | achieves the dehumidification drying method which combined the heating and carrier gas substitution which are performed under a positive pressure, and can exhibit the effect of the method of Claim 1.
[0063]
According to the dehumidifying and drying apparatus for a granular material using carrier gas replacement according to claim 4, the dehumidifying and drying method of claim 1 is provided with only a depressurizing means of a drying hopper. It is an apparatus for realizing a dehumidifying and drying method in combination with substitution, and the effect of the method of claim 1 can be exhibited.
According to the dehumidifying and drying apparatus for a granular material using carrier gas replacement according to claim 5, the dehumidifying and drying apparatus according to claim 1, comprising both a heating means for the granular material and a depressurizing means for the drying hopper. Among the drying methods, it is an apparatus that realizes a dehumidification drying method that combines heating and decompression treatment and carrier gas replacement, and can effectively exhibit the effect of the method of claim 1.
[0064]
According to the dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 6, the dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 3 or 5 In addition to the effect, since the heating means is a heat conduction heating means, the hopper internal structure becomes a simple structure with only a partition wall extending vertically, and since it uses the thermal conductivity of the material, it is gentle and uniform The effect of the heat conduction heating means that heating is possible and the heat efficiency is good and the effect of carrier gas replacement are synergistically exhibited.
[Brief description of the drawings]
FIG. 1 is a system diagram showing the overall configuration of an example of a dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention.
2A and 2B are external views of a main body of a dehumidifying and drying apparatus for a granular material according to an embodiment of the present invention, in which FIG. 2A is a partially cutaway front view, and FIG.
FIG. 3 shows a drying hopper of a dehumidifying and drying apparatus for granular material according to an embodiment of the present invention, wherein (a) is a plan view thereof and (b) is a longitudinal sectional view thereof.
FIGS. 4A and 4B are conceptual diagrams illustrating an embodiment of carrier gas replacement according to the present invention, where FIG. 4A is a diagram in a vacuum state, and FIG. 4B is a diagram in the case of atmospheric pressure or positive pressure.
FIG. 5 is a system diagram showing the overall configuration of another example of the dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention.
FIG. 6 is a longitudinal sectional view showing an example of a conventional dehumidifying and drying apparatus for granular materials.
[Explanation of symbols]
A dehumidifying and drying equipment
1 Drying hopper
29, 35 inlet
27, 36, 38 Gas release means
27 Pressure reducing means
2-7 Heat conduction heating means (heating means)
39 Heating means

Claims (6)

The drying hopper for storing and drying the granular material has a structure in which a heating means is provided on the outer periphery of the heat conduction wall formed of a material having good thermal conductivity, and the drying hopper for storing and drying the granular material. Is formed of a material with good thermal conductivity, and is provided with a heat conduction cylinder having a built-in heating means, and the heat conduction wall extends a plurality of partition walls toward the inside, Each upper end is formed with an upper oblique notch that is inclined downward with the center of the internal space as a valley, and each lower end is formed with a lower oblique notch that is inclined downward with the center as a valley, and The heat conduction cylinder has a plurality of partition walls extending from the central portion of the drying hopper toward the inner wall, and the partition wall has an upper end portion that is downward toward the periphery with the central portion as a top portion. Forming a protruding piece end that slopes Made using the dehumidifying and drying apparatus for powdered or granular material is in the structure formed outs lower beveled lower end is inclined downwardly toward the periphery of the center of the drying hopper as the top,
After storing the powdered or granular material in the drying hopper in a state of being sealed this drying hopper, the pooled powdered or granular material heating, or by vacuum treatment, miscellaneous gases such as water vapor and volatile gas The particulate material is dehumidified by introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper and deriving the gas containing the miscellaneous gas to the outside of the drying hopper. A method for dehumidifying and drying a granular material using carrier gas substitution, characterized by drying.   2. The gas containing the miscellaneous gas is led out of the drying hopper by introducing the carrier gas from outside while heating the granular material by the heat conduction heating means provided in the drying hopper. A dehumidifying and drying method for a granular material using carrier gas replacement. A dry hopper for storing and drying the powder material, a heating means for heating the powder material stored in the dry hopper, and a carrier gas prepared such as humidity and temperature from the outside is introduced into the dry hopper And a gas discharge means for deriving a gas containing miscellaneous gases such as water vapor and volatile gas generated in the dry hopper to the outside, and the dry hopper is stored in a sealed state. By heating the powder material, miscellaneous gases such as water vapor and volatile gas are generated, and a carrier gas prepared such as humidity and temperature is introduced from the outside into the drying hopper, and the miscellaneous gas is introduced. Deriving and drying the granular material by deriving the containing gas to the outside of the drying hopper , and
The drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material with good thermal conductivity, and is formed with a material with good thermal conductivity inside the drying hopper. The built-in heat conducting cylinder is provided, and the heat conducting wall has a plurality of partition walls extending inward, and each upper end is inclined downward with the center of the internal space as a valley. An upper diagonal notch and a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the thermal conduction cylinder has a plurality of partition walls and a center of the drying hopper. The partition wall extends from the portion toward the inner wall, and the partition wall forms a projecting end that slopes downward toward the periphery with the center portion at the top, and the lower end portion is the center of the drying hopper. Around as the top Dehumidifying and drying apparatus for powdered or granular material with a carrier gas displacement, characterized in that it is a structure formed outs lower beveled inclined selfish downward. A drying hopper for storing and drying the powder material, a decompression means for depressurizing the inside of the drying hopper, an introduction port for introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper, and this drying Gas release means for deriving gas containing miscellaneous gas such as water vapor and volatile gas generated in the hopper to the outside, and the stored powder material is decompressed with this dry hopper sealed Thus, while generating miscellaneous gases such as water vapor and volatile gas, a carrier gas prepared with humidity, temperature, etc. is introduced from the outside into the drying hopper, and the gas containing the miscellaneous gas is removed from the drying hopper. By deriving to the outside, the granular material is dehumidified and dried , and
The drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material with good thermal conductivity, and is formed with a material with good thermal conductivity inside the drying hopper. The built-in heat conducting cylinder is provided, and the heat conducting wall has a plurality of partition walls extending inward, and each upper end is inclined downward with the center of the internal space as a valley. An upper diagonal notch and a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the thermal conduction cylinder has a plurality of partition walls and a center of the drying hopper. The partition wall extends from the portion toward the inner wall, and the partition wall forms a projecting end that slopes downward toward the periphery with the center portion at the top, and the lower end portion is the center of the drying hopper. Around as the top Dehumidifying and drying apparatus for powdered or granular material with a carrier gas displacement, characterized in that it is a structure formed outs lower beveled inclined selfish downward. A drying hopper for storing and drying the particulate material, a heating means for heating the particulate material stored in the drying hopper, a decompression means for decompressing the inside of the drying hopper, and a humidity hopper from the outside. The drying hopper has an introduction port for introducing a carrier gas prepared at a temperature and the like, and a gas discharge means for deriving a gas containing miscellaneous gas such as water vapor and volatile gas generated in the drying hopper to the outside. In the dry hopper, humidity and temperature were adjusted in the dry hopper while generating miscellaneous gases such as water vapor and volatile gas by heating and decompressing the stored granular material. Carrier gas is introduced from the outside, and the gas containing the miscellaneous gas is led out of the drying hopper to dehumidify and dry the particulate material , and
The drying hopper is provided with a heating means on the outer periphery of a heat conduction wall formed of a material with good thermal conductivity, and is formed with a material with good thermal conductivity inside the drying hopper. The built-in heat conducting cylinder is provided, and the heat conducting wall has a plurality of partition walls extending inward, and each upper end is inclined downward with the center of the internal space as a valley. An upper diagonal notch and a lower diagonal notch that is inclined downward with the center as a valley at each lower end, and the thermal conduction cylinder has a plurality of partition walls and a center of the drying hopper. The partition wall extends from the portion toward the inner wall, and the partition wall forms a projecting end that slopes downward toward the periphery with the center portion at the top, and the lower end portion is the center of the drying hopper. Around as the top Dehumidifying and drying apparatus for powdered or granular material with a carrier gas displacement, characterized in that it is a structure formed outs lower beveled inclined selfish downward.   6. The dehumidifying and drying apparatus for a granular material using carrier gas replacement according to claim 3, wherein the heating means of the drying hopper is a heat conduction heating means.

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