JP3773674B2 - 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 method and apparatus for dehumidifying and drying a granular material using carrier gas substitution, in which a heating hopper and a drying hopper are separately provided, and the granular material can be efficiently dehumidified and dried in a short time.
[0002]
[Prior art]
The present applicant dehumidifies and dries the granular material by storing the granular material in a drying hopper, which has been widely used in the past as a dehumidifying and drying apparatus for granular material, and ventilating the heat-dried air to this. In order to improve the so-called aeration type dehumidification drying method and apparatus, a dehumidification drying method and apparatus for granular materials using integral carrier gas replacement has been proposed.
[0003]
With this carrier gas replacement, in the conventional dehumidifying drying method and apparatus of the aeration type, heating and dehumidifying drying of the powder material were treated as a series, but heating and dehumidifying drying were separated. It is characterized by that. Dehumidification drying replaces the gas containing miscellaneous gases such as water vapor and volatile gas generated from the powder material in the drying hopper with heating and decompression treatment with a carrier gas prepared such as humidity and temperature. By doing so. Therefore, this method is called carrier gas replacement.
[0004]
FIG. 5 is a system diagram showing an overall configuration of an example of a dehumidifying and drying apparatus for granular material using such heat drying integrated carrier gas replacement.
The dehumidifying and drying apparatus G shown in FIG. 5 is a floor-standing type, and a drying hopper 111 having a heat conducting wall 112 formed in a cylindrical shape and heating means 113 provided on the outer periphery thereof is attached to a machine base 111a. The roller 111b is provided below the machine base 111a and is movable.
[0005]
The drying hopper 111 is provided with a nozzle 121 provided in a material tank or the like, a collector 122, a material input valve 123, and a material discharge valve 124. The nozzle 121 sucks the granular material sequentially supplied to the drying hopper 111 for dehumidification drying, collects it in the collector 122, and the material charging valve 123 causes the granular material to enter the drying hopper 111. In this drying hopper 111, the powder material that has been dehumidified and dried by using carrier gas replacement is discharged from the material discharge valve 124 disposed in the lower part to a resin molding machine or the like as the next step. .
[0006]
In the dry hopper 111, a level gauge (LV) 114 for detecting the amount of the granular material in the hopper is disposed, and a vacuum pump (VP) 127 for evacuating the hopper. Is installed on the machine base 111a and is connected to the upper side of the drying hopper 111 by a pipe. The pipe includes a vacuum sensor (PS) 126 for detecting a predetermined degree of vacuum, a filter 125 for filtering the sucked gas, A valve 128 for returning the inside of the drying hopper 111 to the atmospheric pressure and a pressure gauge (PG) 128a for measuring the degree of vacuum or the degree of pressure reduction in the drying hopper 111 are connected.
[0007]
In the dehumidifying and drying apparatus G, the vacuum pump (VP) 127 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 129 including a valve 129a for introducing carrier gas for carrier gas replacement and an adjusting valve 129b for adjusting the introduction amount is connected to the lower side, and a lower end of the material discharge valve 124 is connected to the lower end of the material discharge valve 124. The blower side of the material transport blower (B) 130 is connected via a transport switching valve 131. Note that the regulating valve 129b is not necessarily required.
[0008]
A transport filter 132 that filters transport air is connected to the suction side of the material transport blower 130, and transport exhaust from a resin molding machine, which is the next process, is connected to the transport filter 132 via a switching valve 134. Alternatively, the transport exhaust from the collector 122 is selectively connected. The machine base 111a is further provided with a control panel 133 that controls the entire dehumidifying and drying apparatus G.
[0009]
As described above, the dehumidifying and drying apparatus G can be used in a place where it is desired to be used and is convenient because related devices are compactly installed and movable on the machine base 111b.
In this granular material dehumidifying and drying apparatus G using carrier gas replacement, the transport switching valve 131 is switched to open the air blowing side of the transport blower 130, while the switching valve 134 is switched to the collector 122 side for transport. The suction side of the blower 130 is connected to the collector 122, and the particulate material is collected in the collector 122 via the nozzle 121.
[0010]
Then, until the level gauge 114 emits a signal from the collector 122, when the granular material is charged and stored in the drying hopper 111, the material charging valve 123 is closed and the airtightness in the drying hopper 111 is maintained. Then, the heated granular material is heated by the heating means 113, and further, the vacuum granular material is decompressed while the inside of the dry hopper 111 is depressurized to a predetermined degree of decompression by the vacuum pump 127. To do.
[0011]
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.
[0012]
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 111, the dehumidifying and drying apparatus G forcibly introduces a carrier gas adjusted in humidity, temperature, and the like from the inlet 129. At the same time, the gas containing the miscellaneous gas in the drying hopper 111 is sucked out by the vacuum pump 127 to the outside of the drying hopper 111 to dehumidify and dry the granular material.
[0013]
Specifically, here, the normal atmosphere is used as the carrier gas, and the adjustment valve 129b of the inlet 129 is adjusted to introduce the outside air, and the vacuum pump 127 is used to dry the introduced atmosphere. The gas in the hopper 111 is sucked and a predetermined pressure reduction degree is maintained by the pressure gauge 128a.
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.
After dehumidifying and drying in this way, the outside air is introduced by the valve 128 to return the atmospheric pressure in the drying hopper 111 to the same atmospheric pressure as the outside, and then the material discharge valve 124 is opened in response to a request from the next process. The dehumidified and dried granular material is discharged, the switching valve 134 is switched to the resin molding machine side, the transport switching valve 131 is switched, and the transport blower 130 supplies the granular material to the resin molding machine in the next process. transport. Moreover, the granular material which should be dehumidified and dried is supplied to the drying hopper 111 from the collector 122 as needed.
[0014]
[Problems to be solved by the invention]
However, in the dehumidifying and drying apparatus for granular materials using this integrated carrier gas replacement, the advantage that heating and dehumidification drying by carrier gas replacement can be separated is still fully utilized. It wasn't.
Moreover, it was not possible to meet the demand for a distributed processing system in which a heating process that takes time was processed at once, and a carrier gas replacement process that could be performed in a short time was dispersed and performed immediately before each next process. .
[0015]
The present invention provides a method and apparatus for dehumidifying and drying granular material using carrier gas replacement, which can solve the above-mentioned conventional problems, can make the most of the advantages of carrier gas replacement, and can construct a distributed processing system. It is intended to provide.
[0016]
[Means for Solving the Problems]
The method for dehumidifying and drying a granular material using carrier gas replacement according to claim 1, wherein the granular material heated in the heating hopper is sequentially supplied to the drying hopper, and the supplied powder is supplied to the drying hopper. After storing the granule material, Insulate and depressurize with the drying hopper sealed. Thus, while generating miscellaneous gases such as water vapor and volatile gas, the carrier gas prepared for humidity and temperature is forcibly introduced from the outside into the drying hopper to dry the gas containing the miscellaneous gases. The powder material is dehumidified and dried by being led out of the hopper.
[0017]
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.
[0018]
This dehumidifying and drying method of granular material using carrier gas replacement is characterized in that heating for carrier gas replacement is performed by a heating hopper and miscellaneous gas replacement is performed by a separate hopper. And
As described above, the carrier gas replacement is performed by separating heating and removal of miscellaneous gas when dehumidifying and drying a granular material such as a resin pellet, without using a large amount of heated and dried air. Although efficient dehumidifying and drying processing can be performed, in the present invention, the heating process and the replacement process of the miscellaneous gas are further performed as separate devices to realize the dispersion process.
[0019]
By doing so, for example, a system configuration in which heating of the granular material that takes time can be performed with a large heating hopper, and replacement of miscellaneous gas in a short time can be performed with a small drying hopper, The degree of freedom of system configuration is improved.
In addition, the heating method in the heating hopper in this case may be any method such as a method using a pipe heater and a heat pipe, a heat conduction heating method (described later), a so-called aeration method, and the like. However, the degree of freedom of system configuration is improved.
[0020]
Further, in the replacement of miscellaneous gas, the dry hopper can be formed in a small size, so that the amount of carrier gas for replacement can be further reduced, and the apparatus can be further downsized.
The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 2 is provided with a material collecting device at the upper end, heat conduction heating means for heating the granular material, or a pipe heater, etc. A heating hopper provided with a heating means, and a drying hopper connected to the heating hopper through a valve. The drying hopper has a heat retaining means for keeping the stored granular material material, and an external to the drying hopper. It has an inlet for introducing a carrier gas prepared such as humidity and temperature, 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.
After supplying the granular material sequentially from the heating hopper and storing it in the dry hopper, the stored granular material is kept warm in a state where the dry hopper is sealed, so that water vapor, volatile gas, etc. While generating miscellaneous gas, the carrier gas prepared for humidity, temperature, etc. is forcibly introduced from the outside into the dry hopper, and the gas containing the miscellaneous gas is led out of the dry hopper, thereby generating powder. It is characterized by dehumidifying and drying the granular material.
[0021]
Here, the heat retaining means refers to means for heating the heated granular material material supplied to the drying hopper to such an extent that it does not fall below a predetermined temperature in the miscellaneous gas replacement step. Therefore, compared with the heating means that positively heats the granular material to a predetermined temperature, such as that provided in the heating hopper, a simpler, smaller output is usually provided, but the heating hopper is heated. A heat retaining means equivalent to the means may be provided.
[0022]
This apparatus is an apparatus that realizes the method according to claim 1 and has only a heat retaining means, and exhibits the effect of the method according to claim 1.
The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 3 is provided with a material collecting apparatus at the upper end, heat conduction heating means for heating the granular material, or a pipe heater, etc. The heating hopper provided with a heating means and a drying hopper connected to the heating hopper through a valve. The drying hopper is a heat retaining means for keeping the stored granular material material and the inside of the drying hopper is decompressed. Pressure reducing means, an introduction port for introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper, and a gas containing miscellaneous gases such as water vapor and volatile gas generated in the drying hopper to the outside Gas releasing means for deriving,
After supplying the granular material sequentially from the heating hopper and storing it in this dry hopper, the stored granular material is kept warm and decompressed in a state where the dry hopper is sealed, thereby allowing water vapor and volatile While generating miscellaneous gas such as gas, the carrier gas prepared for humidity and temperature is forcibly introduced from the outside into the drying hopper, and the gas containing the miscellaneous gas is led out of the drying hopper. The powder material is dehumidified and dried.
[0023]
This apparatus is an apparatus that realizes the method according to claim 1 and includes a heat retaining means and a pressure reducing means, and exhibits the effect of the method according to claim 1 more efficiently. The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 4 is provided with a material collecting apparatus at the upper end, and heating by a heat conduction heating means or a pipe heater for heating the granular material. A common heating hopper provided with a means, a plurality of drying hoppers branched and connected through a transportation pipeline provided with the heating hopper and a valve, and a granular material heated in the common heating hopper, in order from below It is composed of a material transporting means that is automatically taken out and selectively supplied to the drying hopper. Each of the plurality of drying hoppers includes a heat retaining means for keeping the stored granular material material, and a humidity and temperature from the outside to the drying hopper. And an inlet for introducing a prepared carrier gas, etc., 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 Common powdered or granular material is heated by the heating hopper sequentially from a plurality of lower layer Drying hopper In the dry hopper that is selectively supplied to and receives the supply, after the powder is stored, the stored powder material is kept warm in a state in which the dry hopper is sealed, thereby While generating miscellaneous gas such as natural gas, the carrier gas prepared for humidity and temperature is forcibly introduced from the outside into the drying hopper, and the gas containing the miscellaneous gas is led out of the drying hopper. Thus, the particulate material is dehumidified and dried.
[0024]
In this apparatus, a plurality of drying hoppers are connected to a common heating hopper, and heating and gas replacement can be separated. Therefore, such a system can also be constructed.
A large amount of heat treatment is performed with a common heating hopper, and the heated material is supplied to the drying hopper by a material transportation means, and the material supplied from other material supply stations is heated by a material collector. As the hopper is replenished, the heat-dried material is continuously supplied in batches.
[0025]
In this case, for example, a common heating hopper is configured as a large floor-standing type, and a plurality of drying hoppers provided on a plurality of resin molding machines are connected by a material transportation means and heated. It is possible to construct a system that distributes the granular material. In this case, the heating hopper is made large and common, while the drying hopper can be provided on the next machine as an on-machine mold, which is further downsized compared to the integrated type, System waste can be eliminated and costs can be reduced.
[0026]
The dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 5 is provided with a material collecting apparatus at the upper end, and heating by a heat conduction heating means or a pipe heater for heating the granular material. A common heating hopper provided with a means, a plurality of drying hoppers branched and connected through a transportation pipeline provided with the heating hopper and a valve, and the granular material heated in the heating hopper are sequentially taken out from below. Each of the plurality of drying hoppers, a heat retaining means for keeping the stored granular material, a pressure reducing means for reducing the pressure inside the drying hopper, and a drying unit. An inlet for introducing a carrier gas, such as humidity and temperature, from the outside into the hopper, and a gas containing miscellaneous gases such as water vapor and volatile gas generated in the drying hopper to the outside And a gas discharge means for out, common powdered or granular material is heated by the heating hopper sequentially from a plurality of lower layer Drying hopper In the dry hopper that is selectively supplied to and received the supply, the powder material is stored, and then the stored powder material is kept warm and decompressed in a state where the dry hopper is sealed, While generating miscellaneous gas such as water vapor and volatile gas, the carrier gas prepared for humidity and temperature etc. is forcibly introduced from the outside into this drying hopper, and the gas containing the miscellaneous gas is introduced to the outside of the drying hopper. It is characterized by dehumidifying and drying the particulate material.
[0027]
The dehumidifying and drying apparatus according to claim 4 is a dispersion type apparatus according to claim 4, wherein each of the plurality of drying hoppers is further provided with a pressure reducing means in addition to the heat retaining means, so as to generate miscellaneous gas, Further, the pressure reducing process is also performed.
Therefore, as compared with the dehumidifying and drying apparatus according to the fourth aspect, the dehumidifying and drying of the granular material using the carrier gas replacement is performed more efficiently.
[0028]
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 conceptually 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.
[0029]
The dehumidifying and drying apparatus A for granular material using carrier gas replacement receives a heating hopper 1 for heating the granular material, and the supply of heated granular material from the heating hopper 1. The biggest feature is that it has two types of hoppers, a drying hopper 10 for dehumidifying and drying the granular material by gas replacement, and the heating hopper 1 and the drying hopper 10 are connected by a pipe provided with a valve 9. Configured.
[0030]
The heating hopper 1 is provided with a material collecting device 1a for temporarily storing the granular material to be heated at the top, and the granular material to be heated is appropriately supplied from here.
The main body portion of the heating hopper 1 is provided with a heat conduction heating means.
As shown in FIG. 1, the heating 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 heating hopper 1, and 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 aluminum material is provided inside the heating hopper 1, and an internal heating means comprising a pipe heater at the center thereof. 5 is built-in. 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.
[0031]
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 extended radially from the center toward the heat conducting wall 2 constituting the inner wall with substantially the same thickness and at substantially the same interval.
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 certain 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
[0032]
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. Further, the partition walls 6 and 7 do not necessarily have to be provided with substantially the same thickness and at substantially the same interval.
[0033]
Here, when the thermal conductivity of the material constituting the heating 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.
[0034]
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. Provided with such heat conduction heating means Heating hopper According to the above, the granular material supplied into the heating hopper 1 is composed of the external heating means 3 provided on the outer periphery of the heat conducting wall 2 and the internal heating means provided at the center of the inner heat conducting cylinder 4. The heat conduction wall 2, the heat conduction cylinder 4, and the partition walls 6 and 7, which are heated in 5 and 5, are heated indirectly and without temperature unevenness, and are 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.
[0035]
Moreover, the conventional copper pipe heater and heat pipe heating means may adversely affect the granular material to be heated. However, it constitutes the heating hopper 1 of the present invention and is directly powdered. Since the heat conduction wall 2, the heat conduction cylinder 4, and the partition walls 6 and 7 that are in contact with the granular material are formed of a material that does not adversely affect the granular material during heating, such as an aluminum material, There is no such thing.
[0036]
The heating hopper 1 is preferably made of an aluminum material, and the surface thereof is preferably subjected to a surface hardening treatment such as alumite. Thus, if the surface is subjected to a 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.
[0037]
Further, when an aluminum material or the like is used as the heating hopper 1, it is preferable to use an extrusion mold material or a drawing mold material which is formed simultaneously with the shape of the heat conduction wall or the partition wall. If it does so, 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.
[0038]
Next, the drying hopper 10 will be described.
The drying hopper 10 includes a drying hopper main body 11 for storing the heated granular material, a heat retaining means 12 provided on the outer periphery thereof, and in order to further enhance the heat retaining effect of the heat retaining means 12, The hopper cover 12a covers the outer periphery.
[0039]
The drying hopper body 11 is a cylindrical container made of a general carbon steel material, stainless steel material, aluminum material, or the like, and its discharge side is formed in a conical shape whose sectional inner diameter decreases toward the lower part. Thus, the dehumidified and dried powder material is smoothly discharged without stagnation. A known first-in first-out umbrella or a partition wall that divides the inside into small sections may be provided inside the drying hopper body 11. The shape of the drying hopper 10 is preferably cylindrical, but may be an elliptical cylinder or a rectangular cylinder.
[0040]
The heat retaining means 12 is composed of a band heater, a nichrome heater, a ceramic heater, and the like. Also, as shown in this figure, a pipe heater, a ceramic pipe heater, and a heat pipe are used not inside the drying hopper body 11 but inside. You may make it provide what was. In any case, the purpose of the heat retaining means 12 is not to positively heat the internal granular material, but to reduce the temperature of the granular material while replacing the miscellaneous gas. To prevent and maintain a predetermined temperature. However, what is actively heated may be provided.
[0041]
The hopper cover 12a covers the outer periphery of the drying hopper body 11 provided with the heat retaining means 12, and prevents heat from escaping to the outside as much as possible to enhance the heat retaining effect.
The drying hopper 10 further has, on the lower side, an inlet 13 composed of a valve for introducing carrier gas prepared from the outside such as humidity and temperature for carrier gas replacement, and an adjusting valve for adjusting the amount of introduction. To provide a decompression means for generating miscellaneous gas such as water vapor and volatile gas from the granular material on the upper side, and to lead out the gas in the drying hopper containing this miscellaneous gas to the outside A vacuum pump 14 also serving as a gas discharge means is provided, and a material discharge valve 15 for discharging the particulate material dehumidified and dried by carrier gas replacement is provided at the lower part.
[0042]
The drying hopper 10 is further provided with a level gauge (not shown), a vacuum sensor (not shown), etc., similar to the dehumidifying and drying apparatus G (FIG. 5) for the granular material using the integrated carrier gas replacement. Although it is desirable to provide, it is not necessary.
In the drying hopper 10, when the granular material is charged and stored from the heating hopper 1, the valve 9 is closed and sealed so as to maintain the airtightness in the drying hopper 111, and stored by the heat retaining means 12. The temperature of the powdered granular material is maintained, and further, the vacuum powder 14 is used to decompress the granular material while reducing the pressure inside the dry hopper 111 to a predetermined degree of vacuum.
[0043]
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 heat-retaining and heating, but depending on the material, the material may deteriorate if the temperature is too high. 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.
[0044]
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 and heat insulation are often performed together.
In this way, in the dehumidifying and drying apparatus A, a carrier gas whose humidity and temperature are adjusted is forcibly introduced from the inlet 13 while generating miscellaneous gases such as water vapor and volatile gas in the drying hopper 10. At the same time, the gas containing the miscellaneous gas in the drying hopper 10 is sucked out by the vacuum pump 14 and led to the outside of the drying hopper 10 to dehumidify and dry the granular material.
[0045]
Specifically, here, the normal atmosphere is used as the carrier gas, the adjustment valve of the inlet 13 is adjusted, and the outside air is introduced while the vacuum pump 14 is used to dry the hopper by the amount of the introduced atmosphere. The gas in 10 is sucked to maintain a predetermined degree of vacuum in the dry hopper 10.
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 the dehumidifying and drying apparatus for granular material using the separation type carrier gas replacement, as described above, the heating hopper provided with the heat conduction heating means and the drying hopper for performing the miscellaneous gas replacement are provided separately. It is characterized by that.
[0046]
By using a separate body in this way, for example, a system configuration in which heating of a granular material that takes time is performed with a large heating hopper, and miscellaneous gas replacement that can be performed in a short time is performed with a small drying hopper. The degree of freedom of system configuration is improved.
Further, in the replacement of the miscellaneous gas, when the dry hopper is separated, it can be formed in a small size without being restricted by the size of the heating hopper, so that the amount of carrier gas for replacement can be further reduced, and the apparatus Miniaturization can be achieved.
[0047]
In addition, the heating method in the heating hopper in this case may be any method such as a method using a pipe heater and a heat pipe, a heat conduction heating method, a so-called aeration method, etc., and is not limited. The degree of freedom increases. Furthermore, when the heat conduction heating hopper described here is combined with miscellaneous gas replacement, it is synergistic in combination with the advantage of the heat conduction heating method that a large amount of hot air is not required for heating. Exerts a positive effect.
[0048]
Note that the filter is not essential and may not be provided. In addition, although it is desirable from the carrier gas replacement flow that the inlet 13 is provided at the bottom of the drying hopper 10 and the gas discharge means 14 is provided above the hopper 10, this is not necessarily limited thereto. In some cases, the adjustment valve provided at the introduction port may not be provided.
[0049]
FIG. 2 is a system diagram conceptually showing an overall configuration of another example of the dehumidifying and drying apparatus for granular material using carrier gas replacement according to the present invention. Thereafter, the same parts as those already described are denoted by the same reference numerals and redundant description is omitted.
Unlike the dehumidifying and drying apparatus A in FIG. 1 in which the miscellaneous gas replacement is performed under reduced pressure, the dehumidifying and drying apparatus B for the granular material using this carrier gas replacement is different from the dehumidifying and drying apparatus A in FIG. Or it is what is performed under a positive pressure, and the aspects of an inlet and a gas discharge | release means differ.
[0050]
In the drying hopper 10A of the dehumidifying and drying apparatus B, a positive-pressure carrier gas is forcibly supplied on the lower side instead of the inlet 13 formed of a valve and a regulating valve provided in the drying hopper 10 of the dehumidifying and drying apparatus A An introduction port 13A composed of a blower to be introduced and an on-off valve is provided, and a gas discharge means 14A composed of an open valve provided with a filter is provided on the upper side instead of the vacuum pump 14.
[0051]
The drying hopper 10A of the dehumidifying and drying apparatus B generates miscellaneous gas such as water vapor and volatile gas while keeping the granular material supplied from the heating hopper 1 at atmospheric pressure, and is blown by a blower at the inlet 13A. Then, the gas in the drying hopper 10 is discharged by the gas discharge means 38 by the amount of the supplied air by making the inside of the drying hopper 10 into the atmospheric pressure state or the positive pressure state by supercharging the pressurized air with a blower. By releasing, the granular material is dehumidified and dried.
[0052]
According to the dehumidifying and drying apparatus B, it is possible to efficiently dehumidify and dry the granular material by using carrier gas replacement in an atmospheric pressure state or a positive pressure state and not to use a large amount of hot air gas. it can.
Note that the filter is not essential and may not be provided. In addition, although it is desirable from the carrier gas replacement flow that the inlet 13A is provided at the bottom of the drying hopper 10A and the gas discharge means 14A is provided above the hopper 10A, this is not necessarily limited thereto. In some cases, the adjustment valve provided at the introduction port may not be provided.
[0053]
FIG. 3 is a system diagram conceptually 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.
Compared to the dehumidifying and drying apparatuses A and B described so far, a plurality of drying hoppers 10 are connected to the common heating hopper 1A in the dehumidifying and drying apparatus C for the granular material using this carrier gas replacement. It is different in that it is configured as a so-called miscellaneous gas replacement dispersion processing system in which the miscellaneous gas replacement is performed by the common heating hopper 1A and dispersed by the plurality of drying hoppers 10 as necessary.
[0054]
The common heating hopper 1A constituting the dehumidifying / drying apparatus C is larger in order to supply the granular material to the plurality of drying hoppers 10, and here, as a heating means, a pipe heater and a heat pipe are used. The configured heating means 3A is provided inside the hopper 1A. As described above, when the dehumidifying and drying method for granular material using the carrier gas replacement according to the present invention is used, basically, any heating means may be used. A heating means provided inside may be used.
[0055]
In addition, although the material collection apparatus is abbreviate | omitted in this figure, the material collection apparatus similar to the heating hopper 1 is installed also in this heating hopper 1A.
The common heating hopper 1 </ b> A and the plurality of drying hoppers 10 are connected by a transport pipeline 21, and a valve 9 </ b> A is provided on the input side of each drying hopper 10. Each of these valves 9A is connected to the material transporting means 22 by a control line. This material transporting means 22 sequentially takes out the granular material heated in the common heating hopper 1A from below, and requests the material. The valve 9A of the drying hopper 10 that has generated the signal is opened, and the drying hopper 10 is selectively and automatically supplied.
[0056]
In this way, for example, the common heating hopper 1A is configured as a large floor-standing type, and a plurality of drying hoppers 10 provided on the machines of a plurality of resin molding machines are connected by the material transporting means 22, A system can be constructed that dispenses the heated particulate material. In this case, the heating hopper 1A is made large and common, while the drying hopper 10 can be provided on the next process machine as an on-machine type that is further downsized compared to the integrated type. As a result, the waste of the system can be eliminated and the cost can be reduced.
[0057]
FIG. 4 is a system diagram conceptually 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.
In the dehumidifying and drying apparatus D for the granular material using carrier gas replacement, a plurality of drying hoppers are connected to the common heating hopper 1A, similarly to the dehumidifying and drying apparatus C described in FIG. The dry hopper is different from the dry hopper 10A that performs miscellaneous gas replacement under atmospheric pressure or positive pressure, not the dry hopper 10 that performs miscellaneous gas replacement in a reduced pressure state.
[0058]
Thus, even when miscellaneous gas replacement is performed under atmospheric pressure or positive pressure, a miscellaneous gas replacement dispersion treatment system can be constructed, and the same effect as the dehumidifying and drying apparatus C can be obtained.
In the above system, an example in which a plurality of the same types of drying hoppers 10 and 10A are connected to the common heating hopper 1A has been described. However, the same common heating hopper 1A is under reduced pressure. The dry hopper 10 may be connected to the dry hopper 10A under atmospheric pressure or positive pressure.
[0059]
In the dehumidifying and drying apparatuses C and D, the material transporting means 22 automatically supplies the granular material selectively to the drying hopper 10 in response to the material request signal from the drying hoppers 10 and 10A. However, from the common heating hopper 1A to the transport pipeline 21, the valves 9A of the respective drying hoppers 10 and 10A, the dehumidified and dried powder material is filled, and each valve 9A is opened as needed, The granular material may be supplied to the selected dry hopper 10, 10A.
[0060]
【The invention's effect】
According to the method for dehumidifying and drying a granular material using carrier gas replacement according to claim 1, heating for carrier gas replacement is performed by a heating hopper, and replacement of miscellaneous gas is performed by a drying hopper, each by a separate hopper. So, for example, it takes a long time to heat the granular material with a large heating hopper and replace the miscellaneous gas in a short time with a small drying hopper. The degree of freedom of system configuration is improved.
[0061]
In addition, the heating method in the heating hopper in this case may be any method such as a method using a pipe heater and a heat pipe, a heat conduction heating method, a so-called aeration method, etc., and is not limited. The degree of freedom increases.
Further, in the replacement of miscellaneous gas, the dry hopper can be formed in a small size, so that the amount of carrier gas for replacement can be further reduced, and the apparatus can be further downsized.
[0062]
According to the dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 2, the apparatus for realizing the method according to claim 1 has only a heat retaining means. The effect of the described method is exhibited.
According to the apparatus for dehumidifying and drying a granular material using carrier gas replacement according to claim 3, the apparatus for realizing the method according to claim 1 has a heat retaining means and a pressure reducing means. The effect of the method described in the above is exhibited more effectively.
[0063]
According to the dehumidifying and drying apparatus for granular material using carrier gas replacement according to claim 4, a plurality of drying hoppers are connected to a common heating hopper, and the heating hopper is large and common. On the other hand, the drying hopper can be provided on the next machine as an on-machine type that is further downsized compared to the integrated type, and as a whole, the waste of the system is reduced and the cost is reduced. be able to.
[0064]
According to the dehumidifying and drying apparatus for a granular material using carrier gas replacement according to claim 5, in the dispersion type according to claim 4, in addition to the heat retaining means in each of the plurality of drying hoppers, Depressurization means is provided to generate miscellaneous gas. In addition to keeping the temperature, the depressurization process is also performed, so that dehumidifying and drying of the granular material using carrier gas replacement is performed more efficiently. .
[Brief description of the drawings]
FIG. 1 is a system diagram conceptually 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.
FIG. 2 is a system diagram conceptually 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. 3 is a system diagram conceptually 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. 4 is a system diagram conceptually 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. 5 is a system diagram showing an overall configuration of an example of a dehumidifying and drying apparatus for granular material using carrier gas replacement integrated with heat drying.
[Explanation of symbols]
A dehumidifying and drying equipment
1 Heating hopper
1A Common heating hopper
1a Material collector
2-7 Heat conduction heating means
3A Pipe heater
9 Valve
10, 10A Dry hopper
12 Insulation means
13, 13A inlet
14, 14A Gas release means
14 Pressure reducing means
21 Transport pipeline
22 Material transportation means

Claims (5)

The granular material heated in the heating hopper is sequentially supplied to the drying hopper,
In this dry hopper, after storing the supplied granular material , heat and pressure-reducing treatment with the dry hopper sealed , while generating miscellaneous gases such as water vapor and volatile gas,
The carrier material prepared by adjusting the humidity, temperature, etc. is forcibly introduced from the outside into the drying hopper, and the particulate material is dehumidified and dried by deriving the gas containing the miscellaneous gas to the outside of the drying hopper. A dehumidifying and drying method for a granular material using carrier gas replacement. A heating hopper provided with a material collecting device at the upper end and heating means for heating the powder material, or a heating means such as a pipe heater, and a drying hopper connected to the heating hopper through a valve, Consists of
This drying hopper has heat retaining means for retaining the stored granular material,
An introduction port for introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper, and a gas discharge means for deriving a gas including miscellaneous gases such as water vapor and volatile gas generated in the drying hopper to the outside And
After supplying the granular material sequentially from the heating hopper and storing it in the dry hopper, by keeping the stored granular material in a state where the dry hopper is sealed, water vapor, volatile gas, etc. While generating miscellaneous gas, the carrier gas prepared for humidity, temperature, etc. is forcibly introduced from the outside into the dry hopper, and the gas containing the miscellaneous gas is led out of the dry hopper, thereby generating powder. A dehumidifying and drying apparatus for a granular material using carrier gas substitution, wherein the granular material is dehumidified and dried. A heating hopper provided with a material collecting device at the upper end and heating means for heating the powder material, or a heating means such as a pipe heater, and a drying hopper connected to the heating hopper through a valve, Consists of
This drying hopper
Insulation means for keeping the stored granular material material, decompression means for decompressing 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 the drying hopper Gas discharge means for deriving a gas containing miscellaneous gas such as water vapor and volatile gas generated inside,
After supplying the granular material sequentially from the heating hopper and storing it in this dry hopper, the stored granular material is kept warm and decompressed in a state where the dry hopper is sealed, thereby allowing water vapor and volatile While generating miscellaneous gas such as gas, the carrier gas prepared for humidity and temperature is forcibly introduced from the outside into the drying hopper, and the gas containing the miscellaneous gas is led out of the drying hopper. A dehumidifying and drying apparatus for a granular material using carrier gas substitution, characterized in that the granular material is dehumidified and dried. Through a common heating hopper provided with a material collecting device at the upper end and a heating means such as a heat conduction heating means or a pipe heater for heating the granular material, and a transportation pipe line provided with this heating hopper and valve It is composed of a plurality of branch hoppers connected in a branching manner, and a material transporting means that takes out powdered material heated in a common heating hopper sequentially from the lower side and selectively automatically supplies it to the drying hopper.
Each of the plurality of drying hoppers was generated in the drying hopper, a heat retaining means for keeping the stored granular material material, an introduction port for introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper, and Gas discharge means for deriving gas containing miscellaneous gas such as water vapor and volatile gas to the outside,
The granular material heated by the common heating hopper is selectively supplied to a plurality of drying hoppers sequentially from the lower layer, and in the drying hopper receiving the supply, the granular hopper is stored and then the drying hopper is used. Keeping the stored granular materials in a sealed state generates miscellaneous gases such as water vapor and volatile gas, while supplying the carrier gas prepared in humidity and temperature to the outside. The dehumidification of the granular material using carrier gas substitution is characterized in that the granular material is dehumidified and dried by forcibly introducing the gas containing the miscellaneous gas to the outside of the drying hopper. Drying equipment. Through a common heating hopper provided with a material collecting device at the upper end and a heating means such as a heat conduction heating means or a pipe heater for heating the granular material, and a transportation pipe line provided with this heating hopper and valve It is composed of a plurality of branch hoppers connected in a branching manner, and a material transporting means that takes out powdered material heated in a common heating hopper sequentially from the lower side and selectively automatically supplies it to the drying hopper.
Each of the plurality of drying hoppers has a heat retaining means for keeping the stored granular material material, a pressure reducing means for reducing the pressure inside the drying hopper, and an introduction for introducing a carrier gas prepared such as humidity and temperature from the outside into the drying hopper A gas release means for deriving a gas including miscellaneous gas such as water vapor and volatile gas generated in the drying hopper to the outside;
The granular material heated by the common heating hopper is selectively supplied to a plurality of drying hoppers sequentially from the lower layer, and in the drying hopper receiving the supply, the granular hopper is stored and then the drying hopper is used. Carriers with adjusted humidity, temperature, etc. in this dry hopper while generating a miscellaneous gas such as water vapor or volatile gas by keeping the stored granular material in a sealed state while keeping the temperature and pressure reduced. Granules using carrier gas substitution characterized by dehumidifying and drying the granular material by forcibly introducing gas from the outside and deriving the gas containing the miscellaneous gas to the outside of the drying hopper Material dehumidifying and drying equipment.

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