JPH031103Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a volume reduction and solidification processing apparatus for crushed and separated waste plastic film.

Waste plastic products discharged from general households exhibit properties such as melting and high heat generation, so conventionally they are treated as unfit for combustion and are partially crushed and disposed of in landfills along with other unsuitable materials. In order to make more effective use of landfill sites, methods have been developed to reduce the volume of plastics using heat. In addition, crushed garbage is separated and processed as part of resource recovery, and some useful materials are recovered.

As shown in Fig. 1, the conventional waste plastic volume reduction and solidification processing apparatus has a system in which heating gas 1 and waste material 2 flow in countercurrent flow in a rotary kiln 3. Plastics (including earth and sand) whose volume has been reduced from paper containing waste plastics to metals, miscellaneous materials, etc. during volume solidification processing
The mechanism is such that it is separated into two parts. In the figure, 4 is a supply feeder, 5 is an exhaust gas, 6 is a cyclone, 7 is a circulating gas, 8 is a lightweight material, 9 is a granulated material, 1
0 is coarse.

However, recently, for the purpose of appropriate processing and resource recovery, after crushing, wind sorting, sieve sorting, etc. are carried out, and the finally recovered plastic film is subjected to volume reduction and solidification processing, but conventional equipment However, since the sample was mainly made of film and was light, when it was put into the volume reduction device, most of it was carried away by the oncoming heated gas and discharged out of the system, resulting in no granulation.

The purpose of this invention is to provide a device that efficiently reduces the volume of light waste plastic film that has been sorted by wind and solidifies it, and then separates it from paper. To provide a volume reduction and solidification processing device for waste plastic film, which is equipped with a mechanism for granulating all of the film and separating plastic and paper that have become heavy due to granulation using a sorting device that uses wind power. It is something.

An embodiment of the present invention will be described below with reference to the drawings. Figs. 2 to 4 show a flowchart of a volume reduction solidification processing apparatus showing an embodiment of the present invention. The shredded and sorted waste plastic films 11 generally contain about 20% paper, about 10% cloth, and some other dry, lightweight materials such as wood and bamboo, and are mainly composed of glass after being shredded. Together with granulation aids 12 such as fine grains, a fixed amount is fed from a supply hopper 13 via a supply feeder 14 into a rotary kiln 15 installed horizontally and rotating at 5 rpm to 10 rpm. Ru. The sample introduced into the rotary kiln 15 is fed to a feeder 1 whose outlet is opened into the rotary kiln 15 from one side of the rotary kiln 15.
Heated gas 1 at around 200℃ supplied from the surroundings of 4
It is heated while being carried by 6.

As a result, the plastics melt, soften, and adhere, becoming heavier, and are rolled up and rotated together with the granulation aid, gradually granulating them into spherical shapes. At this time, paper, cloth, wood and bamboo, which do not change when exposed to heat of around 200°C, are carried by the heated gas and most of them are discharged from the kiln outlet together with the exhaust gas 17. Items that are not transported and are partially attached to the granules,
Heavy objects are transported to the kiln outlet while rotating, and a trommel 18 turns them into granules 1 with a particle size suitable for landfilling.
It is divided into 9 and 20 large items.

The exhaust gas 17 passes through a separation device such as a cyclone 21 to remove lightweight materials 22, mainly paper, and is then divided into gas 23 that is released into the atmosphere 23 and circulating gas 24 that is partially circulated and used as the heating gas 16. It will be done. The reason why the circulating gas 24 is mixed is to make the heating temperature uniform and to keep the CO ₂ concentration at a certain high value to prevent combustion of the supplied waste plastic films 11.

In addition, the granulated material 19 separated by the trommel 18 has a heat of about 100°C, and if left as it is, it will become a large lump, and it contains a large amount of fine auxiliary materials and paper. The granules are continuously supplied to a vertical classifier 25, etc., and are cooled to form granules 26 that are easy to handle.
The auxiliary material 27 is separated to reuse the auxiliary material, etc.

FIG. 4 is a flow sheet showing the entire plant including the rotary kiln 15 shown in FIG. In addition to recovering heat, the balance is stabilized. Also low
Ignition of organic matter within the tally kiln 15 is suppressed. In addition, in the figure, 31 is A heavy oil, 32 is a hot air generator, 33 is a suspended matter removal device, 34 is a circulation fan,
35 is a cyclone, 36 is a scrubber, 37 is an exhaust gas, and 38 is a circulation pump. Further, when heated gas (for example, boiler exhaust gas) is obtained, the hot air generating furnace 32 is unnecessary, and the heated gas is pushed in by a blower. At this time, granulation is carried out while feeding the waste plastic sheet in the same direction as the flow of hot gas.

Next, the granulation operation will be explained with reference to FIG. 11. Supply a fixed amount of the sample made of the granulation aid 12. The supplied sample is heated by the heating gas 16 while being guided by the guide plate 39 .
A backflow of the sample is then prevented by the grid 40 and the flow of the heated gas 16.

Next, a partition plate 41 installed in the rotary kiln 15 stabilizes the throughput and makes the flow uniform. Due to these effects, the waste plastic films 11 in the sample are heated and shrunk while being mixed with the auxiliary material 12 and granulated, and are removed by the trommel 18 installed below the rotary kiln 15 and are not granulated. The bulky items 20 are separated by climbing over the final partition plate 42. At this time, thin papers, dust, etc. are removed from the rotary kiln 15 by a floating matter removing device 33 shown in FIG.

By the way, conventional waste plastic film volume reduction and solidification processing equipment is excellent in solidifying sorted waste (waste plastics) that is not crushed. That is, this is because the plastics contained in the kiln are fed dirty, heavy, and large, so that they are not discharged from the kiln together with the heated gas at the feed port. In addition, granulation begins after the paper has been fed to a certain extent, so even if the wind speed is high, only the paper will gather at the lighter items. However, since the plastic film after being crushed and sorted is light, most of it is carried by the wind and collected as floating matter by a cyclone or the like, which necessitates the flow as in the present invention.

The present invention is constructed as described in detail above, and waste plastics and granulation aids are supplied into the rotary kiln from the supply feeder, and heating gas is supplied to the surroundings of the supply feeder. By being fed into the rotary kiln in the same direction, the waste plastics are melted, softened, granulated into spheres, and discharged from the rotary kiln outlet.
It is possible to eliminate waste plastic films that are removed together with the exhaust gas without being granulated, thereby improving granulation efficiency.

In addition, in this invention, heating gas is supplied into the rotary kiln from around the supply feeder in the same direction as the films, so that waste plastic films are not scattered (due to being carried by hot air). ) can be prevented as much as possible, and the granulation aid can be brought into contact with the granulation aid quickly, and backflow of waste plastic films and aid material dust can be prevented. That is, most of the waste plastic films are mixed with auxiliary materials and granulated by the rotation of the rotary kiln, but some of the waste plastic films are scattered into the kiln. However, since the flow of hot air stops at the center of the kiln, a vortex is generated toward the center, and some of the scattered films are retained and drawn toward the center. Further, the films scattered on the inner wall side of the kiln are carried to the outside and come into contact with the heated granulation aid. In particular, the generation of vortices is strong at the inlet.
The effect is also great. On the other hand, the films gathered at the center as described above are heated and shrunk, and the films come into contact with each other, forming relatively large particles and falling downward. In the present invention, by forming the vortex as described above, waste plastic films can be efficiently captured at the inlet of the kiln, brought into contact with the granulation aid, and granulated.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet of a conventional waste plastic film volume reduction and solidification processing apparatus, and Fig. 2 is a flow sheet of a waste plastic film volume reduction and solidification processing apparatus showing an embodiment of the present invention. 3 is a detailed view of the main parts in FIG. 2, and FIG. 4 is a flow sheet of the entire plant including the volume reduction solidification treatment apparatus shown in FIG. 3. Explanation of the main parts of the figure, 11... Waste plastic films, 12... Granulation aid, 15... Rotary kiln, 16... Heating gas, 17... Exhaust gas, 19... Granules, 20... coarse items, 22...
Light weight.

Claims (1)

[Scope of utility model registration request] In the volume reduction and solidification processing equipment for crushed and separated waste plastic films, there is a rotary kiln installed horizontally with a guide plate and a partition plate installed inside, and an outlet located inside the kiln on one side of the kiln. The rotary kiln is provided with a supply feeder installed to open into the rotary kiln, and waste plastic films and granulation aids are supplied from the supply feeder into the rotary kiln.
By supplying heated gas into the rotary kiln from around the feeder in the same direction, the waste plastic films are melted, softened, granulated into spherical shapes, and discharged from the rotary kiln outlet. A volume reduction and solidification processing device for waste plastic film, characterized in that: