JP3511125B2 - Processing equipment for thermoplastic metal composites - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device used in a so-called material recycling system for recovering valuable materials from waste materials of composite materials composed of thermoplastics and metals.

[0002]

2. Description of the Related Art A recently developed polyethylene pipe fitting for seismic resistance has, as shown in FIGS. 3 and 4, a heating element (22) made of nichrome wire, brass or brass coil inside the fitting body (21). And a terminal (23) for connecting the power supply is embedded. A large amount of the waste products of the pipe joint have come out as industrial wastes, and development of an effective processing method and a processing device therefor is demanded.

Even if the above-mentioned composite material of a thermoplastic resin such as polyethylene or polypropylene and a metal is directly incinerated in an ordinary incinerator to recover the remaining valuable metal, the surface of the metal is deteriorated due to oxidation. It is difficult to reuse this as it is. Also,
It is difficult to crush or pulverize the thermoplastics, because the thermoplastics are easily plastically deformed as they are.

[0004]

DISCLOSURE OF THE INVENTION The present invention constitutes a composite material by heat-treating a composite material of a thermoplastic and a metal such as the above pipe joint under an optimum temperature condition and in an optimum atmosphere. Thermoplastic metal composite material processing equipment that separates valuable metals and thermoplastics and recovers them in a form that can be reused in each case. The purpose is to provide a device.

[0005]

A thermoplastic metal composite processing apparatus according to the present invention comprises a cylindrical waste storage chamber provided inside a carbonization furnace, and a heat source blowing nozzle facing the interior of the waste storage chamber. And a heat source conduit, which has combustion exhaust gas, heated inert gas, or superheated steam as a heat source, heats the waste material of the composite material composed of the thermoplastic and the metal in the absence of oxygen, and melts the plastic material into the waste storage chamber. In the processing apparatus for thermoplastic metal composites that collects from the lower end of the pipe, a cylindrical molten plastic drop passage that connects to the lower end of the waste storage chamber and penetrates the bottom wall of the carbonization furnace is provided. -Type melting plastic saucer is provided so as to maintain the airtightness between the space below the saucer and the space above the saucer of the same passage, and the lower end of the melting plastic fall passage Mouth and is characterized in that it is water-sealed.

In the processing apparatus, it is preferable that the gas flow in the space above the pan of the molten plastic dropping passage is directed upward.

[0007]

DETAILED DESCRIPTION OF THE INVENTION

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a processing apparatus for thermoplastic metal composites according to the present invention. As shown in the figure,
The thermoplastic metal composite processing equipment uses superheated steam as a heat source to melt the thermoplastic of the thermoplastic metal composite waste, and the waste is mixed with the hardened thermoplastic and non-oxidized metal. It is equipped with a carbonization furnace (1) that separates into two parts, and a combustion furnace (11) that generates superheated steam.

The carbonization furnace (1) has a double tube structure,
Inside the insulation furnace wall (2), a cylindrical waste storage chamber (3)
Is provided. Below the waste storage chamber (3), there is provided a cylindrical molten plastic drop passage (4) connected to the lower end of the waste storage chamber (3) and penetrating the bottom wall of the dry distillation furnace (1). The upper end (3a) of the waste storage chamber (3) projects above the top wall of the carbonization furnace (1), and two waste input dampers (5) are installed in series at the opening. Has been. Waste storage room (3)
Inside the box is a bucket (7) containing the waste material (8) of the composite material consisting of thermoplastic and metal.
The bucket (7) has a vertically long cylindrical shape and is made of a wire mesh or a perforated plate. A spiral heat source conduit (9) is wound around the waste storage chamber (3). At the lower end of this heat source conduit (9), the heat source outlet nozzle (1
0) is provided.

By supplying superheated steam to the heat source conduit (9), this is used as a heat source to heat the thermoplastic metal composite waste (8) in the absence of oxygen to partially decompose the thermoplastic. At the same time, the waste material (8) is melted and separated, and the waste material (8) can be separated into a thermoplastic resin having increased hardness and a non-oxidized metal by partial thermal decomposition. In addition to superheated steam, combustion exhaust gas or heated inert gas can be used as the heat source.

Inside the molten plastic drop passage (4),
A rotating saucer (6) is provided to receive the thermoplastic that has melted and dropped from the waste storage chamber (3).
The lower end opening of the molten plastic drop passage (4) is sealed with water. The saucer (6) has a disk shape when viewed from above and is rotatable about a horizontal axis. Then, the drive motor (not shown) is controlled by the timer so that it rotates 1/2 times every 3 to 5 minutes. Molten Plastic Fall Passage (4)
An annular seal portion (31) surrounding the tray (6) is provided in the. The sealing surface (31a) of the sealing part (31) is
It is a concave surface with an arcuate vertical cross section with a diameter approximately equal to the diameter of the pan, which allows the pan (6) to rotate and the space between the pan below the pan and the space above the pan of the molten plastic drop passage (4). The airtightness between them is maintained. The molten plastic drop passage (4) is provided with a steam injection port (32) for sending steam upward to a space above the saucer (6). The water sealing water tank (33) is filled with cooling water, and new cooling water is supplied from the cooling water supply port (34).

The combustion furnace (11) has a burner (12) at its upper end. In the combustion furnace (11), a superheated steam generating coil (13) is provided, and a predetermined amount of water is injected into the coil (13), and the generated superheated steam is passed through the steam pipe (14). Carbonization furnace
It is led to the heat source conduit (9) in (1). At the lower ends of the combustion furnace (11) and the carbonization furnace (1), the gas for heating the heat source is heated by the carbonization furnace (1).
Exhaust gas conduit between the furnace wall (2) and the waste storage chamber (3)
It is connected by (15). Furnace wall (2) of carbonization furnace (1)
An exhaust gas chimney (16) is provided at the upper end of the. In addition, the waste storage chamber (3) of the combustion furnace (11) and the carbonization furnace (1)
The upper ends of the are connected by an organic gas conduit (17) that guides the organic gas generated by the thermal decomposition of polyethylene to the combustion furnace (11), and the organic gas generated by the thermal decomposition when the thermoplastic is melted. The sex gas is supplied as an auxiliary fuel to the combustion furnace (11) without being discharged to the outside.

At the upper end (3a) of the waste storage chamber (3), there is provided an outside air shutoff gas blowing device (18) for blowing an inert gas or superheated steam between the upper and lower dampers (5) to shut off the outside air. Has been.

Further, the exhaust gas conduit (15) is provided with a water spray device (19) for supplying cooling water for controlling the temperature inside the dry distillation furnace (1).

In the processing apparatus having the above-mentioned structure, the waste material (8) of the composite material made of thermoplastic and metal, for example, the seismic resistant polyethylene pipe joint shown in FIGS. 3 and 4 is put into the bucket (7), and the waste material is discharged. Store in storage room (3). Then, the superheated steam generated in the combustion furnace (11) is guided to the heat source conduit (9) in the carbonization furnace (1), and the exhaust gas generated in the combustion furnace (11) is transferred to the furnace wall of the carbonization furnace (1). Supply between (2) and waste storage room (3). This heats the waste storage chamber (3) and the flexible pipe (9). The exhaust gas is then discharged to the exit chimney (1
Emitted from 6). The temperature in the combustion furnace (11) is 800 ° C. or higher, and the temperature between the furnace wall (2) of the carbonization furnace (1) and the waste storage chamber (3) is 450 to 600 ° C. Also, in the waste storage room (3), the oxygen concentration is 2 at a temperature of 380 to 460 ° C.
Volume% or less. The temperature in the waste storage room (3) is 38
When approaching the upper limit of the range of 0 to 460 ° C., cooling water is injected from the water spraying device (19) into the exhaust gas conduit (15). As a result, the temperature inside the carbonization furnace (1) can be easily controlled. At this time, since the temperature in the combustion furnace (11) does not drop, incomplete combustion in the combustion furnace (11) does not occur. Under such heating conditions, the steam in the heat source conduit (9) is spray-supplied from the heat source blowing nozzle (10) to the waste (8) in the bucket (7), and the waste (8) is subjected to dry distillation. As a result, the thermoplastics that make up the waste (8) are partially pyrolyzed, melted and dropped from the bucket (7), and then the saucer (6)
After being stored in the tank, it is further dropped intermittently every required time into the water tank (33) for water sealing and taken out of the system. Also,
The organic gas produced by thermal decomposition when the thermoplastic is melted is completely combusted in the combustion furnace (11). The molten plastic thus obtained increases in hardness due to thermal decomposition and is collected after being stored in a fixed amount in the pan (6).
At the time of collection, it is flat and amorphous and can be easily crushed. Therefore, not only can this be reused as it is for commercialization, but the ground thermoplastic can also be used as powder fuel. On the other hand, waste
Valuable metal such as nichrome wire or brass that composes (8) remains in the bucket (7) and is separated from the thermoplastic. The valuable metal obtained is free of thermoplastic deposits and surface oxidation and can therefore be reused, for example, as a metallic material for the manufacture of joints.

Further, the lower end opening of the molten plastic drop passage (4) is water-sealed, and further, by the saucer (6) and the seal portion (31), the space below the saucer of the melted plastic fall passage (4) and the space above the saucer are provided. Since the airtightness with the space is maintained, the inflow of outside air into the waste storage chamber (3) through the lower end opening of the molten plastic drop passage (4) and the heat from the waste storage chamber (3). In addition, there is no outflow of water, and the organic gas generated by thermal decomposition when the thermoplastic is melted is prevented from being cooled by the cooling water in the water tank (33) for water sealing to form a wax. Will not be mixed in. Therefore, an increase in the oxygen concentration in the furnace (1) and a decrease in the temperature in the furnace (1) can be prevented, and a high-quality molten plastic containing no wax can be obtained.

Further, by sending steam upward from the steam inlet (32) to the space above the saucer (6), the gas flow in the space above the saucer of the molten plastic drop passage (4) becomes upward, It is possible to completely prevent the wax from being mixed with the recovered molten plastic.

Note that valuable metals such as the heating element (22) and the power source connecting terminal (23) which compose the pipe joint are sufficiently small as compared with the polyethylene pipe joint body (21), so that they cannot be treated several times. Bucket (7) is never filled with metal.
Therefore, it is not necessary to recover valuable metal every time the above treatment is performed, and the waste (8) can be continuously supplied from the upper and lower dampers (5). At this time, waste from the upper damper (5) with the lower damper (5) closed.
(8), close the upper damper (5), and, if necessary, connect the outside air blocking gas blowing device (1) between the upper and lower dampers (5).
Blow inert gas or superheated steam from 8) and drop the waste (8) into the waste storage chamber (3) from the damper (5) below. This prevents the inflow of outside air into the dry distillation furnace (1) and the outflow of heat from the dry distillation furnace (1), preventing both an increase in the oxygen concentration in the furnace (1) and a decrease in the temperature in the furnace (1). To be done. Therefore, the temperature inside the equipment is reduced after each treatment, compared with a batch-type treatment equipment in which valuable metal is taken out each time the waste (8) is treated and a new thermoplastic metal composite material is added. Eliminates the need for better thermal efficiency.

(Comparative Example) FIG. 2 is different from the apparatus for treating a thermoplastic-metal composite material according to the present invention in that it has neither a rotary saucer (6) nor a steam inlet (32). The structure of the molten plastic recovery part of the device is shown. In the figure, the lower end opening of the waste storage chamber (3) has a water-sealed structure, and the superheated steam blown out from the heat source blowing nozzle (10) of the heat source conduit (9) is discarded in the bucket (7). By being spray-supplied to the object (8), the thermoplastic plastic is melted while partially thermally decomposing, and the molten plastic falls into the water tank (33) for water sealing and is taken out of the system. In the device of this comparative example, the organic gas in the waste storage chamber (3) is cooled by the cooling water in the water tank (33) to condense on the water surface to form a wax, which is mixed with the recovered molten plastic. There is a problem that the quality of the recovered molten plastic deteriorates.

[0020]

According to the apparatus for treating a thermoplastic-metal composite material according to the first aspect of the present invention, the waste material of the composite material composed of the thermoplastic resin and the metal is stored in the waste storage chamber and the heat-source outlet nozzle of the heat-source conduit is provided. By supplying flue gas, heated inert gas or superheated steam from the above to the waste, since the waste of the composite material consisting of thermoplastics and metal is heated in the substantial absence of oxygen, The metal has no adhesion of thermoplastics and surface oxidation, and can be reused as a raw material as it is. Further, the thermoplastic plastic is melted while being partially pyrolyzed by heating, and is temporarily collected on the pan and then collected. Molten plastics increase in hardness due to thermal decomposition, so that they can be easily crushed, and crushed thermoplastics can be used as powder fuel.

Further, since the lower end opening of the molten plastic drop passage is water-sealed and the airtightness between the space below the pan and the space above the pan of the melt plastic drop passage is maintained, the molten plastic drop path is maintained. There is no inflow of outside air into the waste storage chamber and no heat outflow from the waste storage chamber through the lower end opening of the furnace, which prevents the increase of oxygen concentration in the furnace and the decrease of temperature in the furnace, and the wax when cooled. Since the organic gas to be used is not cooled, a good quality fused plastic free of wax can be obtained.

According to the thermoplastic metal composite processing apparatus of the second aspect of the present invention, since the organic gas which becomes the wax when cooled cannot move downward, the mixing of the wax into the recovered molten plastic is more complete. Can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic view showing an apparatus for treating a thermoplastic-metal composite material according to the present invention.

FIG. 2 is a diagram showing a conventional technique corresponding to the configuration of the lower end portion of the waste storage chamber of the present invention.

FIG. 3 is a partially cutaway side view showing a seismic resistant polyethylene pipe joint.

FIG. 4 is a front view showing a seismic resistant polyethylene pipe joint.

[Explanation of symbols]

(1) Dry distillation furnace (3) Waste storage room (4) Molten plastic drop passage (6) Rotary saucer (9) Heat source conduit (10) Heat source outlet

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 50-36572 (JP, A) Actually opened 49-33173 (JP, U) Actually opened 47-35069 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B29B 17/00-17/02 C08J 11/00-11/28

Claims (2)

(57) [Claims] 1. A heat source conduit (9) having a cylindrical waste storage chamber (3) provided inside the dry distillation furnace (1) and a heat source outlet nozzle (10) facing the waste storage chamber (3). And heats the waste material of the composite material consisting of thermoplastic and metal in the absence of oxygen by using combustion exhaust gas, heated inert gas or superheated steam as a heat source, and melts the molten plastic into the waste storage chamber.
In the processing device for thermoplastic metal composites collected from the lower end of (3), a cylindrical molten plastic drop passage (4) connected to the lower end of the waste storage chamber (3) and penetrating the bottom wall of the dry distillation furnace (1) ) Is provided for the molten plastic drop passage
The rotary molten plastic saucer (6) is installed in the passage (4) in (4).
The thermoplastic plastic metal composite material is characterized in that it is provided so as to maintain the airtightness between the space below the saucer and the space above the saucer, and the lower end opening of the molten plastic drop passage (4) is sealed with water. apparatus. 2. The thermoplastic metal composite processing apparatus according to claim 1, wherein the gas flow in the space above the pan of the molten plastic drop passage (4) is directed upward.