JP5805024B2 - Method of reusing heat in kneading and granulating apparatus and kneading and granulating apparatus - Google Patents

Description

  The present invention relates to a heat reusing method in a kneading and granulating apparatus, and a kneading and granulating apparatus that can adapt a heat reusing method.

As is well known, a kneading granulation manufacturing apparatus kneads a resin material such as PE or PP while melting it, and extrudes the kneaded resin, and cuts the kneaded resin and cools it with cooling water. It consists of a granulator that produces granular resin and a separator that separates granular resin from cooling water.
Specifically, the kneading machine includes a kneading rotor that kneads the resin material in a barrel that is hollow inside, and a resin material that passes through the barrel in which the kneading rotor rotates. These materials are kneaded. A granulator is disposed downstream of the kneader. The granulator has a die (die plate) for extruding the kneaded and fluidized resin and a cutter for cutting the resin extruded from the die into particles while rotating. These dies and cutters are structured to be housed in a water chamber through which cooling water flows. In this water chamber, the resin from which the cooling water has been cut is cooled. A separator is disposed on the downstream side of the granulator. The separator separates the cooled resin and the cooling water, and the cooled resin is discharged to the outside. The cooling water is used again for cooling the resin after being cooled by a cooler or the like and circulated.

  In order to produce a granular resin, first, a resin material is kneaded into a molten resin with a kneader and sent to a granulator. Next, the molten resin is extruded from a die provided in the granulator, and is cut with a cutter provided in the die. The cut resin becomes a granular resin and is sent to a water chamber filled with cooling water and cooled. The cooled resin is sent to a separator together with cooling water, and separated into granular resin and cooling water. The separated granular resin is discharged to the outside and sent to the next step.

  By the way, in the water chamber of the granulator, the resin having high temperature heat is cooled by cooling water. Therefore, the cooling water after cooling becomes warm water having a relatively high temperature and has a predetermined amount of heat. Effectively reusing the heat quantity of the cooling water is preferable from the viewpoint of energy saving, and as a technique for reusing heat in the kneaded granulation production apparatus, for example, there is one disclosed in Patent Document 1.

  Patent Document 1 discloses an underwater cutting type synthetic resin granulation method and apparatus in which a synthetic resin extruded from an extruder is cut into granules in circulating water of an underwater cutting unit, and the circulating water is cooled by a circulating water cooler. The high temperature obtained by heat exchange with the circulating water cooler is used as an energy source to achieve energy saving. Specifically, the kneading and granulating apparatus of Patent Document 1 is configured to generate electricity using the amount of heat of hot water obtained by heat exchange with a circulating water cooler as a heat source.

JP-A-4-263906

  Conventionally, a resin that has been melted by a kneading machine of a kneading and granulating apparatus is supplied to the granulating machine at a high temperature of 200 ° C. or higher, extruded from a die, and cut into granules by a rotating cutter. The cut granular resin is cooled to 100 ° C. or less by cooling water flowing in the water chamber of the granulator. At this time, the cooling water is heat-exchanged with the granular resin, becomes warm water of 70 ° C. to 90 ° C., and is discharged from the granulator.

Thus, although the cooling water (warm water) discharged from the granulator has a predetermined amount of heat energy, the temperature is 70 to 90 ° C., so that the heat energy of the cooling water is highly efficient. In order to take out and reuse, some technique is required as in Patent Document 1.
However, in the thermal energy recycling method disclosed in Patent Document 1, the amount of heat discharged is converted into electricity using a generator, and thus there is a risk that the utilization efficiency of thermal energy may be reduced.
Therefore, much heat energy is lost. Moreover, by using power generation equipment such as a generator or an expander in the kneading and granulating production apparatus, the equipment of the kneading and granulating production apparatus becomes large. In order to install such a large kneading granulation manufacturing apparatus, a large amount of cost and a wide installation place are required.

  The present invention has been made in view of the above problems, and recovers the amount of heat of the cooling water after separation of the granular resin discharged from the kneading and granulating production apparatus and maintains the heat state while kneading and granulating. An object of the present invention is to provide a kneading and granulating production apparatus capable of reusing heat with high efficiency by returning it to the manufacturing apparatus and a heat reusing method using the kneading and granulating production apparatus.

In order to achieve the object, the present invention takes the following technical means.
The method of reusing heat in the kneading and granulating apparatus according to the present invention includes a kneading machine for kneading a resin, cutting the resin kneaded by the kneading machine into granules with a granulator, and cooling the cut granular resin with cooling water. And a separator for separating the granular resin discharged from the granulator from the cooling water. A method of reusing heat in a kneading and granulating apparatus comprising: The amount of heat of the cooling water after separation of the discharged granular resin is recovered and supplied to the kneader and / or granulator while maintaining the heat state.

Preferably, the kneading and granulating apparatus includes an expansion valve and a compressor, the cooling water after separation of the granular resin is vaporized by the expansion valve, and the vaporized cooling water is adiabatically compressed by the compressor. It is preferable to generate superheated steam and supply the heat amount of the generated superheated steam to the kneader and / or granulator.
Preferably, the amount of heat of the superheated steam is applied to an inert gas via a heat exchanger, and the inert gas to which the amount of heat is applied is passed through a hopper provided in a kneading machine, so that The existing resin material may be heated.

Preferably, the resin material existing in the hopper is heated by heating a hopper provided in the kneader by the amount of heat of the superheated steam.
Preferably, the amount of heat of the superheated steam is applied to the working medium through a heat exchanger, and the working medium to which the amount of heat is applied is passed through the granulator die and / or the kneader chamber. Thus, the die of the granulator and / or the chamber of the kneader may be heated.

Preferably, the superheated steam is passed through the granulator die and / or the kneader chamber to heat the granulator die and / or the kneader chamber. It is good to feature.
Preferably, the cooling water supplied to the granulator is supplied from a water supply source in the factory, and the cooling water converted into superheated steam by the compressor and heat-exchanged with the resin material is again supplied to the water supply source in the factory. It should be characterized by returning.

  A kneading and granulating production apparatus according to the present invention includes a kneading machine for kneading a resin, and a granulating machine for cutting the resin kneaded by the kneading machine into granules with the granulating machine and cooling the cut granular resin with cooling water. And a separator for separating the granular resin discharged from the granulator from the cooling water, and a kneading and granulating apparatus comprising: recovering the amount of heat of the cooling water discharged from the separator; A heat quantity recovery means for supplying the kneader and / or the granulator while maintaining a heat state is provided.

Preferably, the heat recovery means includes an expansion valve that vaporizes the cooling water after separation of the granular resin, and a compressor that adiabatically compresses the cooling water vaporized by the expansion valve to generate superheated steam. Good.
Preferably, the heat quantity recovery means includes a heat exchanger that gives heat of superheated steam generated by the compressor to an inert gas, and the inert gas given heat by the heat exchanger is a kneader. It is good to be comprised so that it may pass through the inside of the hopper with which it was equipped.

Preferably, the heat recovery means is configured to heat the resin material present in the hopper by heating a hopper provided in the kneader by the amount of heat of the superheated steam.
Preferably, the heat amount recovery means includes a heat exchanger that applies a heat amount of superheated steam generated by the compressor to a working medium, and the working medium to which the heat amount is applied by the heat exchanger is a granulator. It is good to be comprised so that the inside of the die | dye and / or the inside of the chamber of a kneader may be heated and the die | dye of the said granulator and / or the chamber of a kneader may be heated.

Preferably, the heat recovery means allows superheated steam to pass through the granulator die and / or the kneader chamber to heat the granulator die and / or the kneader chamber. It should be configured.
Preferably, the cooling water supplied to the granulator is supplied from a water supply source in the factory, and the cooling water converted into superheated steam by the compressor and heat-exchanged with the resin material is again supplied to the water supply source in the factory. It should be configured to return.
The most preferable form of the heat recycling method in the kneading and granulating production apparatus of the present invention is a kneading machine for kneading the resin, and the resin kneaded by the kneading machine is cut into granules by the granulator and after the cutting.
A method of reusing heat in a kneading and granulating apparatus comprising: a granulator for cooling granular resin with cooling water; and a separator for separating granular resin discharged from the granulator from cooling water. The kneading and granulating production apparatus supplies the heat to the kneading machine and / or the granulating machine while recovering the heat quantity of the cooling water after separation of the granular resin discharged from the separator and maintaining the heat state. Comprises an expansion valve and a compressor, vaporizes the cooling water after separation of the granular resin with the expansion valve, adiabatically compresses the vaporized cooling water with the compressor, and generates superheated steam. The amount of heat of the heated superheated steam is supplied to the kneader and / or granulator.
The most preferable form of the kneading and granulating apparatus of the present invention is a kneading machine for kneading the resin, and the resin kneaded by the kneading machine is cut into granules by the granulating machine, and the cut granular resin is cooled with cooling water. A kneading and granulating apparatus comprising a granulator for cooling and a separator for separating granular resin discharged from the granulator from cooling water, the cooling water discharged from the separator having A heat recovery unit is provided for recovering the amount of heat and maintaining the heat state, and supplying the heat to the kneader and / or granulator, and the heat recovery unit vaporizes the cooling water after separation of the granular resin. An expansion valve and a compressor that adiabatically compresses the cooling water vaporized by the expansion valve to generate superheated steam are provided.

  According to the present invention, the amount of heat of the cooling water after separation of the granular resin discharged from the kneading and granulating production apparatus is recovered and returned to the kneading and granulating production apparatus while maintaining the heat state. The heat of the grain production device can be reused with high efficiency.

It is the figure which showed the method of reusing the heat | fever which arose with the kneading | mixing granulation manufacturing apparatus. It is the figure which showed the kneading | mixing granulation manufacturing apparatus of 1st Embodiment. It is the figure which showed the modification of the kneading | mixing granulation manufacturing apparatus of 1st Embodiment. It is the figure which showed the kneading | mixing granulation manufacturing apparatus of 2nd Embodiment. It is the figure which showed the modification of the kneading | mixing granulation manufacturing apparatus of 2nd Embodiment. It is the figure which showed the kneading | mixing granulation manufacturing apparatus of 3rd Embodiment. It is the figure which showed the modification of the kneading | mixing granulation manufacturing apparatus of 3rd Embodiment. It is the figure which showed the kneading | mixing granulation manufacturing apparatus of 4th Embodiment. It is the figure which showed the modification of the kneading | mixing granulation manufacturing apparatus of 4th Embodiment. It is the figure which showed the kneading | mixing granulation manufacturing apparatus of 5th Embodiment. It is the figure which showed the modification of the kneading | mixing granulation manufacturing apparatus of 5th Embodiment.

Hereinafter, an embodiment of a heat reuse method in the kneading and granulating apparatus 1 according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, a kneading and granulating apparatus 1 according to the first embodiment of the present invention kneads a resin material M (powder) such as PE and PP while melting it, and extrudes the kneaded resin. And a granulator 7 for producing the granular resin N by cutting the kneaded resin M and cooling it with the cooling water W, and a separator 11 for separating the granular resin N from the cooling water W. In addition, it has a storage tank 12 for storing the cooling water W discharged from the granulator 7 and passed through the separator 11, and a cooler 14 for cooling the cooling water W discharged from the storage tank 12.

Specifically, in the kneading machine 2, a kneading rotor 3 for kneading the resin material M is rotatably accommodated in a barrel 4 whose inside is hollow, and the inside of the barrel 4 in which the kneading rotor 3 rotates is placed in the resin material M. The resin material M such as PE is kneaded by passing through.
A granulator 7 is arranged on the downstream side of the kneader 2. The granulator 7 includes a die 8 (die plate) for extruding the kneaded and fluidized resin material M, a cutter 9 for cutting the resin material M extruded from the die 8 into particles while rotating, and cooling water. And a water chamber 10 through which W circulates. The die 8 and the cutter 9 are structured to be stored in a water chamber 10 through which the cooling water W flows. In the water chamber 10, the resin (granular resin N) from which the cooling water W has been cut is cooled. The cooling water W after cooling is heated by receiving heat from the high-temperature granular resin N.

A separator 11 is arranged on the downstream side of the granulator 7. The separator 11 separates only the granular resin N from the cooling water W mixed with the cooled granular resin N. The cooling water W and the granular resin N are separated and discharged to the outside of the separator 11. It has become.
As shown in FIG. 2, a storage tank 12 is disposed on the downstream side of the separator 11. The storage tank 12 has a hollow casing for storing the high-temperature cooling water W separated by the separator 11, and discharges the cooling water W flowing from the upstream side (the separator 11 side) to the downstream side. It has become. As the shape of the storage tank 12, various shapes can be adopted as long as the inside is hollow and provided with an inlet and an outlet. For example, a cylindrical shape with a hollow inside may be mentioned.

A circulation pump 13 is disposed on the downstream side of the storage tank 12. The circulation pump 13 pumps the cooling water W discharged from the storage tank 12 on the upstream side to the cooler 14 on the downstream side.
A cooler 14 is disposed on the downstream side of the circulation pump 13. The cooler 14 lowers the temperature of the cooling water W that has become hot water by heat exchange with the granular resin N in the granulator 7, and lowers the cooling water W to a temperature that can be used for cooling the granular resin N again. It is. The cooling water W cooled by the cooler 14 is supplied again into the water chamber 10 of the granulator 7.

The cooling method of the cooler 14 is a method of reducing the temperature of the cooling water W by exchanging heat between the air in the atmosphere and the cooling water W (air cooling method), or heats the refrigerant and the cooling water W. A method (refrigerant cooling method) for lowering the temperature of the cooling water W by exchanging can be employed.
In summary, the granulator 7 (the water chamber 10 of the granulator), the separator 11, the storage tank 12, the cooler 14, and the circulation pump 13 are connected by a closed loop-shaped first water flow path 19, and the circulation pump. By the action of 13, the cooling water W is circulated from the granulator 7 to the granulator 7 through the separator 11 → the storage tank 12 → the cooler 14 in this order. That is, the cooling water W circulates through these first water flow paths 19.

Next, the manufacturing process which manufactures the granular resin N using the above kneading | granulation granulation manufacturing apparatus 1 is demonstrated.
As shown in FIGS. 1 and 2, in the manufacturing process of the resin material M, first, the resin material M is charged into the hopper 5 provided in the kneader 2. The charged resin material M is sent to the kneading section 6 of the kneader 2, and the kneading rotor 3 rotates to start kneading the resin material M. At this time, the kneaded resin material M is in a molten state, has a high temperature of 200 ° C. or higher, and has a large amount of heat energy (hereinafter sometimes referred to as heat quantity). When the kneading of the resin material M is completed in the kneader 2, the resin having a high temperature in the molten state is sent to the granulator 7 on the downstream side of the kneader 2.

The molten resin sent to the granulator 7 is extruded into a water chamber 10 in the granulator from the die 8 provided in the granulator 7, and is cut into particles by the cutter 9 provided in the die 8. . The granular resin N is cooled to 100 ° C. or less in the water chamber 10 filled with the cooling water W. At this time, the cooling water W becomes hot water of 70 to 90 ° C. by heat exchange with the granular resin N.
The cooled granular resin N is sent to the separator 11 together with the cooling water W. In the separator 11, the granular resin N is separated from the cooling water W.

The cooling water W discharged from the separator 11 is sent to the storage tank 12. The cooling water W that has flowed into the storage tank 12 is stored in the storage tank 12 up to a predetermined amount of water, and then pumped by the circulation pump 13.
The cooling water W pumped by the circulation pump 13 is sent to the cooler 14. The cooling water W that has flowed into the cooler 14 is heat-exchanged with air or a cold medium in the atmosphere, and cooled to the low-temperature cooling water W.

The cooled cooling water W is sent to the granulator 7 and used again as the cooling water W for the granular resin N.
As a result, the cooling water W circulates through the first water flow path 19 so that the granular resin N can be cooled a plurality of times.
Now, the cooling water W (70-90 degreeC hot water) heat-exchanged with the granular resin N has predetermined thermal energy. It is very useful to extract and use such heat energy, but since it is relatively low temperature for use as a heat source, it is actually difficult to recover and reuse it efficiently. It was.

Therefore, as a result of intensive studies, the inventors of the present application have again conducted the kneading machine 2 and / or granulation while maintaining the heat energy of the cooling water W (hot water) heat-exchanged with the granular resin N. It was found that effective heat reuse (reuse of waste heat) can be performed by using the method of supplying to the machine 7.
Hereinafter, a heat reuse method in the kneading granulation production apparatus 1 according to the present invention, that is, a waste heat recovery method will be specifically described.

  As shown in FIG. 2, the kneading and granulating production apparatus 1 of the first embodiment includes the kneading machine 2, the granulating machine 7, the separator 11, and the cooling water W that cools the produced granular resin N. The heat energy of the cooling water W, which has a water flow path 19 and is heat-exchanged in the granulator 7, is recovered, and the inert gas T is evaporated using this heat energy to evaporate the inert gas. A heat quantity recovery means 15 for heating the resin material M with the vapor of the gas T is provided.

The heat recovery means 15 includes an expansion valve 16 that decompresses and vaporizes the cooling water W discharged from the granulator 7, a compressor 17 that adiabatically compresses the vaporized cooling water W to generate superheated steam X, and superheated steam. And a heat exchanger 18 that imparts the heat quantity of X to the inert gas T.
Specifically, the cooling water W discharged from the granulator 7 via the separator 11 is temporarily stored in the storage tank 12. An expansion valve 16 that decompresses and vaporizes the cooling water W is connected to the downstream side of the storage tank 12 so that the cooling water W of the storage tank 12 can be branched and vaporized.

A compressor 17 that adiabatically compresses the vaporized cooling water W to generate superheated steam X is provided on the downstream side of the expansion valve 16.
A heat exchanger 18 is provided on the downstream side of the compressor 17. The superheated steam X generated by the compressor 17 flows through the primary side of the heat exchanger 18, and the inert gas T (for example, nitrogen) flows through the secondary side. Heat is applied to the active gas T. That is, the superheated steam X is heat exchanged with the inert gas T. The superheated steam X after heat exchange changes into a liquid, is returned to the upstream side of the cooler 14, and merges with the cooling water W flowing in the first water flow path 19.

The primary sides of the expansion valve 16, the compressor 17, and the heat exchanger 18 are branched from the storage tank 12 and returned to the space between the cooler 14 and the circulation pump 13 on the first water flow path 19. It will be deployed (on the closed-loop second water flow path 20).
On the secondary side of the heat exchanger 18, a medium flow path 21 in which an inert gas T (nitrogen) is circulated is provided. This medium flow path 21 is provided in the hopper 5 provided in the kneader 2. It is deployed to pass through.

As described above, when the heat energy is reused by using the heat quantity recovery means 15 described above, the heat energy of the cooling water W that has been heat-exchanged in the granulator 7 and becomes hot water is recovered, and this heat energy is recovered. The inert gas T is used to heat, and the resin material M is heated with the heated inert gas T.
Specifically, the granular resin N cut by the cutter 9 provided in the granulator 7 is extruded into the cooling water W flowing through the granulator 7, and the thermal energy of the granular resin N is converted into the cooling water W. Is granted. The cooling water W rises to about 70 to 90 ° C. and becomes hot water. The cooling water W (warm water) to which thermal energy is applied passes through the first water flow path 19 and is sent to the separator 11 together with the cooled granular resin N.

In the separator 11, the cooling water W to which thermal energy is applied is separated from the granular resin N. At this time, the cooling water W is sent to the storage tank 12, and the granular resin N is discharged outside. In the storage tank 12, the water is branched into a cooling water W sent to the cooler 14 through the first water flow path 19 and a cooling water W sent to the expansion valve 16 through the second water flow path 20.
The cooling water W branched into the second water flow path 20 is depressurized by the expansion valve 16 to become steam of 70 ° C. or higher and sent to the compressor 17. The cooling water W that has become steam is adiabatically compressed by the compressor 17, generated as superheated steam X at 215 ° C. or higher, and sent to the heat exchanger 18. In the heat exchanger 18, the superheated steam X sent from the compressor 17 is heat-exchanged with the inert gas T flowing in the medium flow path 21, and the inert gas T is heated to 110 ° C. or higher. The cooling water W lowered in temperature via the heat exchanger 18 is returned to the upstream side of the cooler 14.

The inert gas T to which heat energy is applied and set to 110 ° C. or more passes through the hopper 5 provided in the kneader 2 so as to flow from the lower side and flow out from the upper side, and the resin material M in the hopper 5. The resin material M in the hopper 5 is heated to about 100 ° C. by directly contacting the surface. At this time,
Control is performed so that the temperature of the resin material M in the hopper 5 does not exceed 110 ° C. If the resin material M exceeds 110 ° C., the resin material M may be melted and fixed in the hopper 5. Therefore, the temperature of the resin is controlled so as not to melt. After the heating of the resin material M, the inert gas T is cooled by heat exchange with the resin material M and returned to the heat exchanger 18.

  That is, in the first embodiment of the present invention, the cooling water W circulates through the second water flow path 20 formed in a closed loop shape in the order of the storage tank 12 → the expansion valve 16 → the compressor 17 → the heat exchanger 18 → the cooler 14. At this time, heat is applied to the inert gas T in the medium flow path 21 by the heat exchanger 18. The inert gas T to which heat is applied flows through the medium flow path 21 and directly heats the low temperature (˜80 ° C.) resin material M (powder).

By doing so, the thermal energy generated by cooling the granular resin N is recovered, the thermal energy is applied to the resin material M in the hopper 5, and the thermal energy is reused with high efficiency. Yes. Furthermore, by heating the resin material M using such a method, the resin material M becomes soft, and the driving force of the kneading rotor 3 of the kneading machine 2 can be reduced.
[Modification of First Embodiment]
Next, the modification of 1st Embodiment in the manufacturing apparatus 1 of this invention is demonstrated with reference to figures.

As shown in FIG. 3, the structure of the kneading and granulating production apparatus 1 according to the modification of the first embodiment is substantially the same as the apparatus of the first embodiment (see FIG. 2).
That is, the kneading and granulating production apparatus 1 of the present modification includes a kneading machine 2 that extrudes the kneaded resin, and a granulating machine 7 that produces the granular resin N by cutting the kneaded resin and cooling it with the cooling water W. And a separator 11 that separates the granular resin N from the cooling water W. In addition, it has a storage tank 12 for storing the cooling water W discharged from the granulator 7 and passed through the separator 11, and a cooler 14 for cooling the cooling water W discharged from the storage tank 12. The same is true in that W circulates through the first water flow path 19.

Further, the heat recovery means 15 includes an expansion valve 16 that depressurizes and vaporizes the cooling water W discharged from the storage tank 12, and a compressor 17 that adiabatically compresses the vaporized cooling water W to generate superheated steam X. Is the same.
However, in this modification, after the cooling water W passes through the storage tank 12 → the expansion valve 16 → the compressor 17 → the heat exchanger 18, the primary side pipe of the heat exchanger 18 is connected to the drainage facility 22 in the factory or the factory. It is configured to be connected to a circulating water facility 22 that circulates inside, and the cooling water W after the heat exchange in the heat exchanger 18 is returned to the drainage facility 22 in the factory (loop-like shape) It is very different in that it is not a water channel.

In addition, the granulator 7, the separator 11, the storage tank 12, and the cooler 14 are connected in order, and the circulating water that circulates in the factory is connected to the closed-loop first water flow path 19 that circulates the cooling water W by the circulation pump 13. The point that the cooling water W from the facility 22 is supplied to the upstream side of the cooler 14 is also greatly different from the first embodiment.
That is, in this modification, the cooling water W supplied to the granulator 7 is supplied from a water supply source (drainage equipment 22) in the factory, and is converted into superheated steam X by the compressor 17 and heat exchanged with the resin material M. It is a great feature that the cooling water W is returned to the water supply source (drainage facility 22) in the factory again. By doing in this way, a lot of cooling water W can be supplied from the inside of a factory, and cooling of granular resin N and giving of heat to inert gas T can be performed now with high efficiency.

In addition, since the other structure in the modification of 1st Embodiment and the effect which there exists are substantially the same as 1st Embodiment, the description is abbreviate | omitted.
[Second Embodiment]
Next, 2nd Embodiment in the manufacturing apparatus 1 of this invention is described with reference to figures.
As shown in FIG. 4, the structure of the kneading and granulating apparatus 1 according to the second embodiment is substantially the same as the apparatus (see FIG. 2) of the first embodiment.

That is, the kneading and granulating production apparatus 1 of the second embodiment includes a kneading machine 2 that extrudes the kneaded resin, and a granulating machine that produces the granular resin N by cutting the kneaded resin and cooling it with the cooling water W. 7 and the separator 11 that separates the granular resin N from the cooling water W are the same. In addition, it has a storage tank 12 for storing the cooling water W discharged from the granulator 7 and passed through the separator 11, and a cooler 14 for cooling the cooling water W discharged from the storage tank 12. The same is true in that W circulates through the first water flow path 19.

Further, the heat recovery means 15 includes an expansion valve 16 that depressurizes and vaporizes the cooling water W discharged from the storage tank 12, and a compressor 17 that adiabatically compresses the vaporized cooling water W to generate superheated steam X. Is the same.
However, in 2nd Embodiment, the heat exchanger 18 is not provided in the 2nd water flow path 20, but the 2nd water flow path 20 through which the superheated steam X produced | generated by the compressor 17 distribute | circulates is shown in FIG. Moreover, it arrange | positions so that the outer peripheral surface of the hopper 5 may be wound helically, and the superheated steam X passes toward the upper side from the lower side of the hopper 5. As shown in FIG. The second water flow path 20 through which the superheated steam X flows may be laid on the inner peripheral surface of the hopper 5.

By doing in this way, the thermal energy of the superheated steam X can be given to the hopper 5, and the resin material M in the hopper 5 can be indirectly heated. Are very different.
Thus, it becomes unnecessary to use the inert gas T by making the heat exchanger 18 unnecessary, and the control of the supply amount of the inert gas T can be omitted. Furthermore, since the resin material M in the hopper 5 and the superheated steam X are not in direct contact with each other, the heat recovery means 15 can be configured with a simple configuration and at low cost.

In addition, since the other structure in 2nd Embodiment and the effect to show | play are substantially the same as 1st Embodiment, the description is abbreviate | omitted.
[Modification of Second Embodiment]
Next, the modification of 2nd Embodiment in the manufacturing apparatus 1 of this invention is demonstrated with reference to figures.

As shown in FIG. 5, the structure of the kneading and granulating production apparatus 1 according to the modification of the second embodiment is substantially the same as that of the apparatus of the second embodiment (see FIG. 4).
However, in this modification, as shown in FIG. 5, the second water flow path 20 through which the superheated steam X generated by the compressor 17 flows is not in a closed loop shape. to differ greatly. That is, the 2nd water flow path 20 is arrange | positioned so that the outer peripheral surface of the hopper 5 may be spirally wound, and the superheated steam X passes toward the upper side from the lower side of the hopper 5. As shown in FIG. The arranged second water flow path 20 is configured to be connected to a drainage facility 22 in the factory and a circulating water facility 22 that circulates in the factory on the outlet side (downstream side), and the cooling water W after heat exchange is generated. It is returned to the drainage facility 22 in the factory.

In addition, the granulator 7, the separator 11, the storage tank 12, and the cooler 14 are connected in order, and the circulating water that circulates in the factory is connected to the closed-loop first water flow path 19 that circulates the cooling water W by the circulation pump 13. The point that the cooling water W from the facility 22 is supplied to the upstream side of the cooler 14 is also greatly different from the first embodiment.
That is, in this modification, the cooling water W supplied to the granulator 7 is supplied from a water supply source (drainage equipment 22) in the factory, is converted into superheated steam X by the compressor 17, and is exchanged with the resin material M. It is a great feature that the cooled water W is returned to the water supply source (drainage facility 22) in the factory again. By doing in this way, a lot of cooling water W can be supplied from the inside of a factory, and cooling of granular resin N and giving of heat to hopper 5 can be performed now with high efficiency.

In addition, since the other structure in the modified example of 2nd Embodiment and the effect which there exists are the same as 2nd Embodiment, the description is abbreviate | omitted.
[Third Embodiment]
Next, 3rd Embodiment in the manufacturing apparatus 1 of this invention is described with reference to figures.
As shown in FIG. 6, the configuration of the kneading and granulating production apparatus 1 according to the third embodiment is substantially the same as the apparatus of the first embodiment (see FIG. 2).

That is, the kneading and granulating production apparatus 1 of the third embodiment includes a kneading machine 2 that extrudes the kneaded resin, and a granulating machine that produces the granular resin N by cutting the kneaded resin and cooling it with the cooling water W. 7 and the separator 11 that separates the granular resin N from the cooling water W are the same. In addition, it has a storage tank 12 for storing the cooling water W discharged from the granulator 7 and passed through the separator 11, and a cooler 14 for cooling the cooling water W discharged from the storage tank 12. The point that the water W circulates through the first water flow path 19 is also the same.

  Furthermore, as a heat quantity recovery means 15 for recovering the heat of the cooling water W discharged from the granulator 7, the expansion valve 16 for depressurizing and evaporating the cooling water W discharged from the storage tank 12, vaporization The second water flow path 20 is formed with the compressor 17 for adiabatically compressing the cooled cooling water W to generate the superheated steam X, and the primary side of the heat exchanger 18 for exchanging the heat of the superheated steam X, and the first water flow The same is true in that the cooling water W branched from the passage 19 circulates in the second water passage 20. The same is true in that a medium flow path 21 through which oil R (heating medium) flows is connected to the secondary side of the heat exchanger 18.

  However, in 3rd Embodiment, it is comprised so that the die | dye 8 of the granulator 7 (pelletizer) may be heated with the thermal energy of the oil R heat-exchanged with the heat exchanger 18 with which the 2nd water flow path 20 was equipped. The point is greatly different from the first embodiment. The medium flow path 21 passes through the inside of the die 8 of the granulator 7, and the oil R heated by the heat energy of the superheated steam X generated by the compressor 17 passes therethrough.

  Specifically, the die 8 of the granulator 7 has a cylindrical shape, and is provided with a ring-shaped outer body constituting the outside of the die 8 and a nozzle (die hole) provided inside the outer body. The die main body 8 and a columnar inner body provided inside the die main body 8 are configured. Gaps are formed between the outer body, the die body 8, and between the inner body and the die body 8. This gap communicates with a flow path formed inside the die body 8, and a flow path through which oil R (heating medium) flowing into the medium flow path 21 passes is formed by the flow path and the gap inside the die. ing. Such a configuration of the die 8 is general as described in JP-A-2010-23404, [0011] to [0020].

As described above, when the heat energy is reused by using the heat quantity recovery means 15 described above, the heat energy of the cooling water W that has been heat-exchanged in the granulator 7 and becomes hot water is recovered, and this heat energy is recovered. The heating medium (oil R) is used to heat the die itself with the heated oil R.
Specifically, similarly to the first embodiment described above, the cooling water W branched into the second water flow path 20 is adiabatically compressed by the compressor 17 to become superheated steam X of 215 ° C. or more, and the heat exchanger 18 Sent to the primary side. In the heat exchanger 18, the superheated steam X sent from the compressor 17 is heat-exchanged with the oil R flowing in the medium flow path 21 on the secondary side, and the oil R is heated to 200 ° C. or higher. The primary-side cooling water W that has been cooled through the heat exchanger 18 is returned to the inlet side of the cooler 14 provided in the first water flow path 19.

  The oil R to which heat energy is applied by the heat exchanger 18 to 200 ° C. or higher flows into the die 8 of the granulator 7 provided in the manufacturing apparatus 1 and heats the die 8 to 200 ° C. or higher. This prevents clogging of nozzles formed on the die 8 (clogging with molten resin). At this time, the temperature of the oil R is controlled so that the molten resin is fixed in the nozzle and the production of the granular resin N is not stopped. After the heating of the die 8 is finished, the oil R having cooled down is returned to the secondary side of the heat exchanger 18 and is heated again.

In addition, since the other structure in 3rd Embodiment and the effect to show | play are substantially the same as 1st Embodiment, the description is abbreviate | omitted.
[Modification of Third Embodiment]
Next, the modification of 3rd Embodiment in the manufacturing apparatus 1 of this invention is demonstrated with reference to figures.

As shown in FIG. 7, the configuration of the kneaded granulation production apparatus 1 according to the modification of the third embodiment is substantially the same as the apparatus of the third embodiment (see FIG. 6), and is provided in the second water channel 20. The same is true in that the die 8 of the granulator 7 is heated by the heat energy extracted by the heat exchanger 18 thus obtained.
However, in the third embodiment, in the second water flow path 20, the cooling water W passes through the storage tank 12 → the expansion valve 16 → the compressor 17 → the primary side of the heat exchanger 18, and then the primary side of the heat exchanger 18. The pipe is configured to be connected to a drainage facility 22 in the factory or a circulating water facility 22 that circulates in the factory, and the cooling water W after heat exchange in the heat exchanger 18 is returned to the drainage facility 22 in the factory. The point (the point which does not become a loop-shaped circulating water flow path) is greatly different.

Moreover, the point from which the cooling water W from the circulating water installation 22 circulated in the factory is supplied to the upstream of the cooler 14 connected to the 1st water flow path 19 is also significantly different from 3rd Embodiment.
That is, in this modification, the cooling water W supplied to the granulator 7 is supplied from a water supply source (drainage equipment 22) in the factory, and is converted into superheated steam X by the compressor 17 and heat exchanged with the resin material M. It is a great feature that the cooling water W is returned to the water supply source (drainage facility 22) in the factory again. By doing in this way, a lot of cooling water W can be supplied from the inside of a factory, and cooling of granular resin N and giving of heat to oil R can be performed now with high efficiency.

In addition, since the other structure in the modification of 3rd Embodiment and the effect to show | play are substantially the same as 3rd Embodiment, the description is abbreviate | omitted.
[Fourth Embodiment]
Next, 4th Embodiment in the manufacturing apparatus 1 of this invention is described with reference to figures.
As shown in FIG. 8, the structure of the kneading granulation manufacturing apparatus 1 which concerns on 4th Embodiment is as substantially the same as the apparatus (refer FIG. 4) of 2nd Embodiment.

However, in the fourth embodiment, the second water flow path 20 through which the superheated steam X generated by the compressor 17 flows is connected to the die 8 of the granulator 7 as shown in FIG. The point that the superheated steam X heated and adiabatically compressed by the compressor 17 circulates in the flow path formed in this is significantly different from the second embodiment.
Furthermore, in the fourth embodiment, on the downstream side of the compressor 17, the superheated steam pipe 23 to which the superheated steam X from the factory is supplied is connected to the closed-loop second water flow path 20, and this superheated steam X is The point that the superheated steam X generated in the compressor 17 joins and is sent to the die 8 is also greatly different. In addition, on the downstream side of the die 8 (granulator 7), a pipe that can be discharged to the drainage facility 22 in the factory is connected to the second water flow path 20 in a closed loop shape, and a part of the cooled cooling water W is supplied to the factory The point which can discharge | emit to the drainage equipment 22 of this is a big difference.

In other words, in the fourth embodiment of the present invention, the superheated steam X is allowed to flow directly inside the die 8 so that the die 8 can be superheated, and nozzle clogging due to the sticking of the granular resin N can be prevented. it can. Since the superheated steam X is directly circulated inside the die 8, a heating medium such as the oil R can be omitted. Further, even when the temperature of the cooling water W discharged from the granulator 7 is low (when the heat energy is low), the temperature of the die 8 can be reliably increased by using the superheated steam X in the factory. Is possible.
[Modification of Fourth Embodiment]
Next, the modification of 4th Embodiment in the manufacturing apparatus 1 of this invention is demonstrated with reference to figures.

As shown in FIG. 9, the configuration of the kneaded granulation production apparatus 1 according to the modification of the fourth embodiment is substantially the same as the apparatus of the fourth embodiment (see FIG. 8).
However, in this modification, the piping after passing through the storage tank 12 → the expansion valve 16 → the compressor 17 → the granulator 7 is connected to the drainage facility 22 in the factory and the circulating water facility 22 that circulates in the factory. The point that the cooling water W that is configured and flows through the second water flow path 20 to heat the die 8 of the granulator 7 is all returned to the drainage equipment 22 in the factory. This is very different from the fourth embodiment.

Further, the granulator 7, the separator 11, the storage tank 12, and the cooler 14 are connected in order, and the closed loop-shaped first water flow path 19 (on the upstream side of the cooler 14) that circulates the cooling water W by the circulation pump 13. The point that the cooling water W is supplied from the water supply source in the factory (the drainage facility 22 in the factory) is also greatly different from the fourth embodiment.
That is, this modification has a great feature in that the cooling water W supplied to the granulator 7 is supplied from a water supply source (drainage facility 22) in the factory. The cooling water W can be supplied from the inside of the factory, and can contribute to the factory of cooling efficiency and heat recovery efficiency.

In addition, since the other structure in the modified example of 4th Embodiment and the effect which there exists are substantially the same as 4th Embodiment, the description is abbreviate | omitted.
[Fifth Embodiment]
Next, 5th Embodiment in the manufacturing apparatus 1 of this invention is described with reference to figures.
As shown in FIG. 10, the structure of the kneading granulation manufacturing apparatus 1 according to the fifth embodiment is substantially the same as the apparatus (see FIG. 8) of the fourth embodiment.

  That is, the kneading and granulating production apparatus 1 of the fourth embodiment includes a kneading machine 2 that extrudes the kneaded resin, and a granulating machine that produces the granular resin N by cutting the kneaded resin and cooling it with the cooling water W. 7 and the separator 11 that separates the granular resin N from the cooling water W are the same. In addition, it has a storage tank 12 for storing the cooling water W discharged from the granulator 7 and passed through the separator 11, and a cooler 14 for cooling the cooling water W discharged from the storage tank 12. The point that W circulates through the 1st water flow path 19 is also the same.

Further, the heat recovery means 15 includes an expansion valve 16 that depressurizes and vaporizes the cooling water W discharged from the storage tank 12, and a compressor 17 that adiabatically compresses the vaporized cooling water W to generate superheated steam X. Is the same.
Furthermore, on the downstream side of the compressor 17, there are a superheated steam pipe 23 to which superheated steam X from the factory is supplied, and a pipe that can discharge a part of the cooled cooling water W to the drainage equipment 22 in the factory. The point connected with the 2nd water flow path 20 is also the same.

However, in the fifth embodiment, the second water flow path 20 through which the superheated steam X generated by the compressor 17 flows is connected to the chamber 4 (barrel) of the kneader 2 as shown in FIG. The point that the superheated steam X heated by adiabatic compression by the compressor 17 flows in the flow path formed inside the chamber 4 is significantly different from the fourth embodiment.
Specifically, the chamber 4 of the kneading machine 2 has a structure in which a hollow kneading chamber is formed, and two kneading rotors 3 are inserted (accommodated) into the kneading chamber. The cross section of the kneading chamber has a shape in which two circles communicate with each other (glass hole shape), and the two kneading rotors 3 accommodated in the kneading chamber rotate so that the resin material M is kneaded. It has become.

  On the outer peripheral side of the inner wall surface of the kneading chamber, which is a solid part of the chamber 4, a flow path (temperature control flow path) through which a heated or cooled fluid can flow is formed. This temperature control flow path is formed so as to face the axial direction of the chamber 4 (the axial center direction of the kneading rotor 3) along the inner wall surface of the kneading chamber. Such a configuration of the chamber 4 is general as described in, for example, [0011] to [0018] of FIG. 1 and Japanese Patent Laid-Open No. 2008-238824.

  Therefore, in the fifth embodiment, the superheated steam X generated by the compressor 17 and flowing through the second water flow path 20 is led to the temperature control flow path in the chamber 4 to be circulated, thereby the chamber 4 (kneading chamber). The resin material M inside can be heated. By heating the resin material M, the driving force of the kneading rotor 3 required when the resin material M is kneaded can be suppressed, and the amount of heat of the drainage discharged from the granulator 7 can be effectively reused. It becomes possible to do.

Moreover, since it becomes the structure (superheated steam piping 23) from which the superheated steam X from the factory is supplied to the 2nd water flow path 20 similarly to 4th Embodiment, it is discharged | emitted from the granulator 7. Even when the temperature of the cooling water W is low (when the heat energy is low), it is possible to reliably raise the temperature of the chamber 4 by using the superheated steam X in the factory.
[Modification of Fifth Embodiment]
Next, the modification of 5th Embodiment in the manufacturing apparatus 1 of this invention is demonstrated with reference to figures.

As shown in FIG. 11, the structure of the kneading and granulating production apparatus 1 according to the modification of the fifth embodiment is substantially the same as the apparatus of the fifth embodiment (see FIG. 10).
However, in this modification, the granulator 7, the separator 11, the storage tank 12, and the cooler 14 are connected in order, and the closed-loop first water flow path 19 that circulates the cooling water W by the circulation pump 13 is connected to the factory. Is different from the fifth embodiment in that cooling water W is supplied from a water supply source (drainage facility 22).

In addition, after passing through the storage tank 12 → the expansion valve 16 → the compressor 17 → the chamber 4, the cooling water W that heated the chamber 4 is all returned to the drainage equipment 22 in the factory, This is very different from the fifth embodiment.
In other words, the present modification is greatly characterized in that the cooling water W supplied to the granulator 7 is supplied from a water supply source in the factory (drainage equipment 22 in the factory). Thus, a large amount of cooling water W can be supplied from the factory, which can contribute to improvement in cooling efficiency and heat recovery efficiency.

In addition, since the other structure in the modification of 5th Embodiment and the effect to show | play are substantially the same as 5th Embodiment, the description is abbreviate | omitted.
As described above, through the embodiments, according to the manufacturing apparatus 1 of the present invention and the thermal energy reuse method in the manufacturing apparatus 1, the thermal energy of the cooling water W generated when the granular resin N is cooled. The heat energy can be reused with high recovery efficiency without converting the heat energy into electricity. Furthermore, when the resin material M is heated using such a recycling method, the driving force of the kneading rotor 3 when the resin material M is kneaded can be reduced.

  It should be noted that matters not explicitly disclosed in the embodiment disclosed this time, such as operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component, deviate from the range normally practiced by those skilled in the art. However, matters that can be easily assumed by those skilled in the art are employed.

1 Kneading granulation manufacturing equipment (manufacturing equipment)
2 Kneading machine 3 Kneading rotor 4 Chamber (barrel)
5 Hopper 6 Kneading part 7 Granulator (pelletizer)
8 Die (die plate)
9 Cutter 10 Water chamber 11 Separator 12 Storage tank 13 Circulation pump 14 Cooler 15 Heat recovery means 16 Expansion valve 17 Compressor 18 Heat exchanger 19 First water flow path 20 Second water flow path 21 Medium flow path 22 Drainage equipment (circulation) Water equipment)
23 Superheated steam piping M Resin material (powder)
N granular resin T inert gas (medium)
R oil (medium)
W Cooling water X Superheated steam

Claims (12)

A kneader for kneading the resin, a granulator for cutting the resin kneaded by the kneader into granules with a granulator, and cooling the cut granular resin with cooling water, and granules discharged from the granulator A separator that separates the resin from the cooling water, and a heat reuse method in the kneading and granulating apparatus comprising recovering the amount of heat of the cooling water after separation of the granular resin discharged from the separator, While maintaining the state of heat, supply to the kneader and / or granulator ,
The kneading and granulating apparatus includes an expansion valve and a compressor,
Evaporating the cooling water after separation of the granular resin with the expansion valve, adiabatically compressing the vaporized cooling water with the compressor to generate superheated steam,
A method of reusing heat in a kneading and granulating apparatus, characterized in that the amount of heat of the generated superheated steam is supplied to the kneading machine and / or granulating machine . Giving the amount of heat of the superheated steam to an inert gas through a heat exchanger,
The inert gas heat is applied, by passing through a hopper provided in the kneader, kneading granulation manufacturing according to claim 1, characterized in that heating the resin material present in the hopper How to recycle heat in equipment. Wherein the the heat of superheated steam heating hopper provided in the kneading machine, the heat in the kneading granulation manufacturing apparatus according to claim 1, characterized in that heating the resin material present in the hopper How to reuse. Applying the amount of heat of the superheated steam to the working medium via a heat exchanger,
The working medium to which the amount of heat is applied is passed through the granulator die and / or the kneader chamber to heat the granulator die and / or the kneader chamber. The method of reusing heat in the kneading and granulating apparatus according to claim 1 , wherein: The superheated steam is passed through a granulator die and / or a kneader chamber to heat the granulator die and / or the kneader chamber. A method of reusing heat in the kneading and granulating apparatus according to claim 1 . The cooling water supplied to the granulator is supplied from a water supply source in the factory, and the cooling water converted into superheated steam by the compressor and heat-exchanged with the resin material is returned again to the water supply source in the factory. A method of reusing heat in a kneading and granulating apparatus according to any one of claims 1 to 5 . A kneader for kneading the resin, a granulator for cutting the resin kneaded by the kneader into granules with a granulator, and cooling the cut granular resin with cooling water, and granules discharged from the granulator A separator for separating the resin from the cooling water, and a kneading and granulating production apparatus comprising:
Recovering the amount of heat of the cooling water discharged from the separator, and maintaining the state of heat, comprising heat amount recovery means for supplying to the kneader and / or granulator ,
The heat recovery means includes an expansion valve that vaporizes the cooling water after separation of the granular resin, and a compressor that adiabatically compresses the cooling water vaporized by the expansion valve to generate superheated steam. A kneading and granulating apparatus. The heat recovery means includes a heat exchanger that imparts heat of superheated steam generated by the compressor to an inert gas,
The kneading and granulating apparatus according to claim 7 , wherein the inert gas to which heat is given by the heat exchanger is configured to pass through a hopper provided in the kneading machine. The heat quantity recovery means is configured to heat a resin material existing in the hopper by heating a hopper provided in the kneading machine with a heat quantity of the superheated steam. kneading granulation manufacturing apparatus according to 7. The heat recovery means includes a heat exchanger that imparts to the working medium the heat of the superheated steam generated by the compressor,
The working medium to which heat is given by the heat exchanger passes through the granulator die and / or the kneader chamber, and heats the granulator die and / or the kneader chamber. It is comprised as follows, The kneading | mixing granulation manufacturing apparatus of Claim 7 characterized by the above-mentioned. The heat recovery means is configured to allow superheated steam to pass through a granulator die and / or a kneader chamber and heat the granulator die and / or kneader chamber. The kneading and granulating apparatus according to claim 7 , wherein: The cooling water supplied to the granulator is supplied from a water supply source in the factory, and the cooling water that has been converted into superheated steam by the compressor and heat-exchanged with the resin material is returned to the water supply source in the factory again. The kneading and granulating production apparatus according to any one of claims 7 to 11 , wherein the kneading and granulating apparatus is configured as described above.

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