JP2000313887A - Apparatus for treating waste plastics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove chlorine efficiently from waste plastics contg. polyvinyl chloride. SOLUTION: This apparatus for treating waste plastics comprises a dechlorination furnace 12 for heating and dechlorinating waste plastics contg. polyvinyl chloride, the furnace having cutter blades 15 rotating about a shaft 14, and a phthalic acid recovering apparatus 26 for recovering phthalic acid from a gas generated from the dechlorination furnace 12. The dechlorination furnace 12 and the phthalic acid recovering apparatus 26 are connected to each other with a gas exhaust pipe 19 having a heater 20. Since the generated gas is heated with the heater 20 in the gas exhaust pipe 19, plugging of the gas exhaust pipe 19 with phthalic acid crystallized in the pipe can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating waste plastic for removing harmful chlorine from vinyl chloride in order to convert waste plastic containing vinyl chloride into a solid fuel and use it for cement firing in a cement kiln.

[0002]

2. Description of the Related Art In Japan, 4 million tons of waste plastic are discharged from households annually, and they are incinerated or landfilled without being recycled at all. Waste plastic is originally produced from petroleum and has high calories, so it can be used as well as fossil resources.

However, in Japan, the amount of vinyl chloride used is higher than in European countries and the like, so that plastic waste discharged from homes contains about 10% of vinyl chloride. In order to use the waste plastic containing vinyl chloride (PVC) as a fuel, it is necessary to remove harmful chlorine contained in the waste plastic before burning. The main chlorine source in waste plastics is vinyl chloride, which has the property of decomposing at about 300 ° C. to release hydrogen chloride. So 3 waste plastic
When heated to around 00 ° C., most of the chlorine contained in the waste plastic can be removed as hydrogen chloride.

[0004]

An example of an apparatus for performing such processing is disclosed in Japanese Patent Application Laid-Open No. 5-245463.
The apparatus disclosed in Japanese Patent Application Laid-Open No. 5-245463 is an apparatus in which a valve for adjusting the internal pressure is attached to the outlet of a screw extruder used for molding plastics. It is kneaded below and dechlorinated. However, performing dechlorination with such a conventional apparatus is very dangerous.

[0005] That is, when dechlorination is performed at such a pressure temperature, PET (raw material for polyethylene terephthalate, PET bottles, magnetic tapes, OHP sheets, etc.) contained in waste plastic is decomposed to produce terephthalic acid. Also, phthalic anhydride is generated from DOP or the like contained as a plasticizer in PVC. These terephthalic acid and phthalic anhydride accumulate in the piping and block the piping. If phthalic anhydride and terephthalic acid generated simultaneously by this dechlorination clog in the hydrochloric acid gas recovery system, hydrogen chloride gas is not only scattered around, but there is also a danger of explosion. In addition, foreign matters such as iron and aluminum mixed in the waste plastic are easily clogged in the screw, and it is very difficult to continuously and stably operate the screw. Also, if it gets clogged, it will be necessary to remove the hot screw and remove foreign matter, which is very dangerous,
In addition, harmful gases will be released to the surroundings.

[0006] The present invention has been made in view of such a point, and an object of the present invention is to provide a waste plastic processing apparatus capable of efficiently removing chlorine from waste plastic.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and a gas generated from the dechlorination furnace. Waste gas processing apparatus, comprising: a generated gas processing apparatus that collects hydrochloric acid and oil by treating the waste gas; and a gas exhaust pipe having a heater is provided between the dechlorination furnace and the generated gas processing apparatus. A dechlorination furnace that heats and dechlorinates waste plastic containing vinyl chloride that has cutter blades that rotate around the shaft, and a generated gas treatment that collects hydrochloric acid and oil by processing gas generated from the dechlorination furnace A waste plastic processing apparatus characterized in that the generated gas processing apparatus has a pressure keeping device for maintaining the pressure of the generated gas at a constant level. It has a dechlorination furnace that heats and dechlorinates waste plastic containing vinyl chloride with tar blades, and a generated gas treatment device that processes gas generated from the dechlorination furnace and recovers hydrochloric acid and oil. The gas processing device has a heat exchanger for recovering hydrochloric acid, and the heat exchanger is provided with a spray nozzle for spraying water into the heat exchanger. A dechlorination furnace for heating and dechlorinating waste plastic containing vinyl chloride having cutter blades to perform, and a generated gas processing device for processing generated gas from the dechlorination furnace and recovering hydrochloric acid and oil, The generated gas treatment device has a phthalic acid recovery device, and the phthalic acid recovery device has a cylindrical cooling cylinder provided with an inlet pipe and an outlet pipe, and a screw disposed in the cooling cylinder. thing A waste plastic processing device, a dechlorination furnace that has cutter blades rotating around a shaft and heats and dechlorinates waste plastic containing vinyl chloride, and a hydrochloric acid that processes gas generated from the dechlorination furnace And a generated gas processing device for collecting oil, the dechlorination furnace has a cylindrical shape, the cutter blade has a point symmetrical shape with the shaft as a center, and both ends of the cutter blade with respect to the rotation direction of the cutter blade. As it recedes backward, an R portion having a radius of 1/5 to 1/2 of the inner diameter of the dechlorination furnace is formed, and a gap of 5 to 50 mm is formed between the dechlorination furnace and both ends of the cutter blade. Waste plastic processing equipment, a dechlorination furnace for heating and dechlorinating waste plastic containing vinyl chloride with cutter blades rotating around a shaft, and dechlorination A degassing furnace is provided with a waste plastic cooling / discharging device and a buffer tank, and the waste plastic cooling / discharging device is equipped with a cooling jacket and a cooling tank. , A screw provided in the cooling jacket to send waste plastic,
A waste plastic processing apparatus characterized by having a scraper blade connected to a screw and scraping the waste plastic into a buffer tank; heating a waste plastic containing vinyl chloride having a cutter blade rotating around a shaft; A dechlorination furnace for treating and dechlorinating the waste plastic; and a generated gas treatment device for recovering hydrochloric acid and oil by treating the generated gas from the dechlorination furnace. The waste plastic processing apparatus according to claim 7, wherein the outer diameter of the screw is gradually reduced toward the scraping blade, wherein the screw is adjusted to ° C. A dechlorination furnace for heating and dechlorinating waste plastic containing vinyl chloride with rotating cutter blades; A degassing furnace is connected to the waste plastic cooling and discharging device, and a waste plastic cooling and discharging device is connected to the dechlorination furnace. Is provided with a partition plate for storing the molten plastic, a waste plastic treatment device, a cutter blade having a rotating blade around a shaft, and a dechlorination device for heating and dechlorinating waste plastic containing vinyl chloride. It is equipped with a chlorine furnace, a generated gas processing device that processes generated gas from the dechlorination furnace and recovers hydrochloric acid and oil, and a charging hopper is provided above the dechlorination furnace via a cleaning blade. Waste plastic processing equipment, a dechlorination furnace for heating and dechlorinating waste plastic containing vinyl chloride with cutter blades rotating around a shaft, and a dechlorination furnace A waste gas treatment device, comprising a plurality of input hoppers at the top of the dechlorination furnace, with a waste gas treatment device for treating the generated gas to recover hydrochloric acid and oil. A dechlorination furnace having rotating cutter blades and heating and dechlorinating waste plastic containing vinyl chloride;
Equipped with a generated gas processing device for processing the generated gas from the dechlorination furnace to recover hydrochloric acid and oil, and on the upstream side of the dechlorination furnace,
A crushing and dewatering device that performs waste plastic pretreatment is provided, and this crushing and dewatering device has a crusher that crushes waste plastic, a spray device that sprays waste plastic with spray water, and a centrifugal dehydrator that dewaters waste plastic. A waste plastic processing device, a dechlorination furnace that has cutter blades that rotate around a shaft, heats and dechlorinates waste plastic containing vinyl chloride, and processes gas generated from the dechlorination furnace. A generated gas treatment device for recovering hydrochloric acid and oil, and a wind separation device for performing pretreatment of waste plastics is provided upstream of the dechlorination furnace, and the wind separation device is provided with a separation pipe provided in a vertical direction, A supply pipe that supplies waste plastic to the sorting pipe, an air pipe that blows air to the waste plastic provided at the lower part of the sorting pipe, and a sorting pipe A waste plastic processing apparatus characterized by comprising a discharge pipe for discharging the waste plastics provided above.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 4 are views showing a first embodiment of a waste plastic processing apparatus according to the present invention.

As shown in FIG. 1, the waste plastic processing apparatus includes a receiving tank 1 for receiving crushed waste plastic 2, an input hopper 4 connected to the receiving tank 1 via a suction pipe 3 having a valve 3a, and A dechlorination furnace 12 is connected to the charging hopper 4 via a charging valve 10 having a valve body 10a.

The charging hopper 4 includes a stirring blade 7.
The stirring blade 7 is connected to a stirring blade driving device 9 via a hollow shaft 7a. A blower 5 is connected to the suction pipe 5b of the charging hopper 4 via a valve 5a, and a vacuum pump 6 is connected via a valve 6a.

A charging pipe 11 having a cooling jacket 11a is provided between the charging valve 10 and the dechlorination furnace 12, and a cleaning blade 8 is provided in the charging pipe 11. The cleaning blade 8 is connected to a stirring blade driving device 9 via a shaft 8a, and is driven by the stirring blade driving device 9. The cleaning blade 8 is a shaft 8a.
It expands and contracts with it and is stored in the hollow shaft 7.

Further, a cutter blade 15 fixed to a rotating shaft 14 is provided in the dechlorination furnace 12, and the shaft 14 is rotated by a motor 13. Further, the heating medium 17 heated by the heating medium heating device 18 is supplied to the dechlorination furnace 12.

Further, a waste plastic cooling and discharging device 21 and a buffer tank 22 are sequentially connected to the dechlorination furnace 12. A ball valve 24 is provided in the buffer tank 22.
The RPF discharge container 23 is connected via the RPF, and a vacuum pump 25 is connected to the RPF discharge container 23.

A phthalic acid recovering device 26 is connected to the chlorine furnace 12 through a gas exhaust pipe 20 having a heater 20. The phthalic acid recovering device 26 has a ball valve 27.
The discharge container 28 is connected via the.

The phthalic acid recovery device 26 is connected to a pressure regulator 31 via a connecting pipe 30 having a ball valve 29, and the pressure regulator 31 is filled with oil 32. Further, valves 33 and 34 are attached to the pressure holding device 31.

Further, a tank 36 is connected to the pressure-holding device 31 via a vacuum pump 35. The tank 36 has a heat exchanger 37 equipped with a cooling water supply device 38, a condensed oil recovery tank 39, and a hydrochloric acid recovery tower 40. Are sequentially connected.

Further, a hydrochloric acid cooling and circulating device 41 and an activated carbon filter 42 are connected to the hydrochloric acid recovery tower 40, and a catalyst 43 is attached to the hydrochloric acid recovery tower 40.

Next, the phthalic acid recovery apparatus 26 will be described with reference to FIG. The phthalic acid recovery device 26 includes a main body 26a,
It has a cooling jacket 47 provided on the main body 26a, and an impeller 45 arranged in the cooling jacket 47,
The impeller 45 is driven by a motor 46.

A motor 5 is provided below the main body 26a.
A stirring blade 48 and a screw 49 driven by 0 are provided, and a discharge container 28 is connected to a lower end of the main body 26a via a ball valve 27.

As shown in FIG. 3, the waste plastic cooling and discharging device 22 is interposed between the cooling jacket 52, a screw 51 provided in the cooling jacket 52 and driven by a motor 51b, and the screw 51 and the motor 51b. It has a scraping blade 51a and a scraping cutter 53. In the buffer tank 22, a screw 54 driven by a motor 54a is provided.

As shown in FIG. 4, the cutter blade 15 provided in the dechlorination furnace 12 has a sharp cutting edge 1 at its tip.
5a are attached, and the upper blade edge 15a in the figure is a single blade having a flat surface on the front side in the figure, and the lower blade edge 15a is a single blade having a flat surface on the back side of the paper. Each cutting edge 15a has an R portion, and the R portion of the cutting edge 15a is 1/1 / the inner diameter of the dechlorination furnace 12.
A gap G having a radius of 5１ ／ is formed between the cutting edge 15 a and the inner surface of the dechlorination furnace 12. The cutting edge 15a has a shape that retreats backward in the rotation direction.

In FIG. 1, a phthalic acid recovery device 26 provided on the downstream side of the dechlorination furnace 14 and the components downstream of the phthalic acid recovery device 26 constitute a generated gas treatment device.

Next, the operation of the present embodiment having the above configuration will be described.

First, the crushed waste plastic is put into the receiving tank 1. Next, the blower 5 is moved, the valves 3a and 5a are opened, and the waste plastic 2 is sucked into the charging hopper 4 together with air. Since the suction pipe 3 is attached to the hopper 4 in the axial direction, the waste plastic 2 sucked into the hopper 4 is pressed against the wall of the hopper 4 by centrifugal force and falls down, and only the air is sucked into the blower 5. Will be issued. The suction pipe 5b is also attached to the hopper 4 in the axial direction, causing a strong swirling flow,
The centrifugal force assists in separating fluff and dust from the waste plastic 2.

Next, the valves 3a and 5a are closed, and the valve 6a
Is opened and the vacuum pump 6 is started to make the inside of the charging hopper 4 vacuum. When the vacuum is confirmed, the valve 6a is closed, the vacuum pump 6 is stopped, and the valve 10 is opened. Then, the stirring blade 7 is rotated, and the waste plastic accumulated in the charging hopper 4 is introduced into the dechlorination furnace 12. When all the waste plastics 2 enter the dechlorination furnace 12, the valve 10
Is closed, and the waste plastic 2 to be charged next is supplied to the receiving tank 1.

A cooling jacket 11a is provided in the charging pipe 11 between the dechlorination furnace 12 and the charging valve 10.
The upper portion of the cooling jacket 11a has a normal temperature, and the lower portion has a high temperature. Since the waste plastic 2 melts at high temperature, the cooling jacket 1
1a prevents the waste plastic 2 from adhering to the wall of the charging pipe 11. The portion of the high-temperature inlet pipe 11 below the cooling jacket 11a is thickened so that the waste plastic 2 does not adhere.

On the other hand, the shaft 8a to which the cleaning blade 8 is attached is usually stored in the hollow shaft 7a. In the vicinity of the cooling jacket 11a, oil generated by partially decomposing the plastic 2, terephthalic acid produced by decomposing PET, DOP contained as a plasticizer and phthalic anhydride produced by decomposing DOP condense and adhere. I do. If these deposits are too thick on the inner wall of the charging pipe 11, the charging of the plastic 2 is hindered. Therefore, the shaft 8a is extended downward, and the deposits attached to the inner wall of the charging pipe 11 are dropped by the cleaning blade 8. This operation is performed every time the plastic is charged or once every several times.

On the other hand, the dechlorination furnace 12 is previously heated by the heat medium 17 to a temperature for performing dechlorination from about 300 ° C. to about 350 ° C. The pressure inside the dechlorination furnace 12 is
The air is evacuated to about 0.2 atm by a vacuum pump 35. Considering the life of the heat medium, the lower the temperature at which dechlorination is performed, the better the temperature at which dechlorination is performed, considering the speed of dechlorination. Therefore, when a heat medium is used, a temperature of about 330 ° C. is usually set. When the wall surface is directly heated by the combustion gas, the temperature of the furnace wall of the dechlorination furnace 12 is 3
It is set around 50 ° C. Inside the dechlorination furnace 12, a cutter blade 15 for cutting and stirring the waste plastic 2 is attached to a shaft 14, and the cutter blade 15 is rotated by a motor 13.

The waste plastics 2 charged into the dechlorination furnace 12 enter the dechlorination furnace 12 from the rightmost side, and the waste plastics 2 in the molten state before being charged into that part are extruded and sequentially leftward. Move on. In this way, the waste plastic is extruded and flows from right to left of the dechlorination furnace 12 sequentially. A waste plastic cooling and discharging device 21 is provided on the left end surface of the dechlorination furnace 12. The molten waste plastic that has reached the left end surface of the dechlorination furnace is cooled by the waste plastic cooling / discharging device 21 and sequentially discharged to the buffer tank 22. A partition plate 16 is provided on the waste plastic cooling and discharging device 21 side in the dechlorination furnace 12 to isolate the outlet of the waste plastic cooling and discharging device 21 from the action of stirring by the cutter 15 to promote the discharge of the waste plastic. I do. The residence time of the waste plastic 2 in the dechlorination furnace 12 is determined by the number of times of charging, the amount of charging per unit, and the amount of discharge. A residence time of 15 minutes to 2 hours is required for sufficient dechlorination of the waste plastic. The partition plate 16 also functions to prevent waste plastic from being discharged without being sufficiently dechlorinated.

When the waste plastic is heated to about 300 ° C., vinyl chloride contained in the waste plastic is decomposed in the dechlorination furnace 12 to generate hydrogen chloride gas. At the same time, PET contained in the waste plastic is also decomposed to generate terephthalic acid (gas). DOP contained in plastic as a plasticizer also evaporates or decomposes to phthalic anhydride (gas). These gases are discharged from the dechlorination furnace 12 by a gas exhaust pipe 19. Of these gases, terephthalic acid and phthalic anhydride are crystalline substances that cause tube obstruction. Terephthalic acid crystallizes at 300 ° C or lower, and phthalic anhydride crystallizes at 130 ° C or lower. These are cooled and collected by the phthalic acid recovery device 26. Gas exhaust pipe 19 connecting phthalic acid recovery device 26 and dechlorination furnace 12
The heater 20 is housed inside the heater, and the temperature of the heater 20 is controlled at about 300 ° C. to about 400 ° C. The heater 20 prevents terephthalic acid from crystallizing inside the exhaust pipe 19 and blocking the gas exhaust pipe 19.

Next, the operation of the phthalic acid treatment device 26 will be described. In FIG. 2, a cooling jacket 47 and an impeller 45 are provided in the phthalic acid treatment device 26, and the impeller 45 is rotated by a motor 46 to agitate and rotate the gas introduced into the phthalic acid treatment device 26. . The gas is cooled by the cooling jacket 47. At this time, it is desirable that the temperature of the cooling jacket 47 is low,
It is set to about 30 ° C. to about 30 ° C. When the temperature of the gas becomes low, mist of terephthalic acid is generated in the gas. Since this mist is heavier than the gas, it collides with the wall surface of the main body 26 by centrifugal force and falls downward while growing. The gas that is cooled and not condensed by this device is discharged out of the main body 26a from a gas outlet 45a provided at the center of the impeller 45. A stirring blade 48 is provided below the phthalic acid treatment device 26,
Screws 49 and a motor 50 for rotating them are provided.

In the case of plastic garbage discharged from households in Japan, the amount of terephthalic acid and the like recovered by the phthalic acid recovery device 26 is about 10 to 15% of the amount of waste plastic charged into the dechlorination furnace 12. Therefore, every time determined by the container size, the valve 27 is opened, the stirring blade 48 and the screw 49 are rotated, and the discharge container 28 is rotated.
To recover phthalic acids.

A pressure retainer 31 is provided between the phthalic acid recovery device 26 and the vacuum pump 35, and an oil 32 is placed inside the pressure retainer. It is sucked into the pump 35. For this reason, even if the pressure on the vacuum pump 35 side becomes vacuum, the pressure of the dechlorination furnace 12 and the phthalic acid recovery device 26 increases by the height of the oil. Terephthalic acid, phthalic anhydride, DOP and the like evaporate under vacuum, but the pressure is maintained by the pressure-holding device 31 to prevent the once crystallized or condensed material from being gasified again and entering the vacuum pump 35.

The exhaust gas of the vacuum pump 35 mainly consists of hydrogen chloride gas and oil and moisture generated when the waste plastic is decomposed. When compressed to atmospheric pressure by the vacuum pump 35, the water and oil condense, and the tank 36 collects them. Further, the gas by the heat exchanger 37 is further cooled to about 0 ° C. Cooling down to -40 ° C
Although hydrocarbon gas of 4 or less can be recovered, practically 0 ° C.
A degree is enough.

When the gas is cooled to 0 ° C., hydrocarbon gas of C5 or more can be condensed and removed. When cooled to 0 ° C., the oil and water contained in the exhaust gas are further condensed, and the oil and water are recovered in the recovery tank 39. The last thing left is hydrogen chloride gas with very little oil and moisture. This is dissolved and recovered in water in a hydrochloric acid absorption tower 40 in which a shower nozzle is attached to an upper flange. The water (hydrochloric acid) inside the hydrochloric acid absorption tower 40 is circulated by the hydrochloric acid cooling and circulating device 41, and is showered from a shower nozzle installed in the hydrochloric acid recovery tower 40. A very small amount of oil as well as hydrochloric acid is dissolved in water, and this oil is absorbed by the activated carbon 42 from the water. Some gas remains after the hydrochloric acid is removed. This gas is an inert gas and a lower hydrocarbon gas such as methane. Since methane is a warming substance, it is burned by the catalyst 43.

During this time, the dechlorinated waste plastic in the dechlorination furnace 12 is sent to a waste plastic cooling and discharging device 21. As shown in FIG. 3, the outer diameter of a screw 51 provided in the waste plastic cooling / discharging device 21 is gradually reduced toward the scraper blades 51 a, and the transfer force of the waste plastic is reduced by such a screw 51. Can be enhanced. In FIG. 3, the waste plastic melted by the screw 51 is drawn to the cooling jacket 52 side, and is cooled and solidified on the wall surface of the cooling jacket 52. The drawn-out waste plastic 2 is scraped off from the screw 51 by the scraping cutter 53, and the waste plastic 2 entangled further is scraped off by the scraper blade 51 a connected to the screw 51.
fall into. In the buffer tank 22, the waste plastic 2 is cooled to a semi-molten state by a heat medium and discharged. At this time, waste plastic is 100 ~ 200
C., preferably in a semi-molten state at 120 to 180.degree.

(1) As described above, according to the present embodiment, the cooling jacket 11a is provided in the charging pipe 11 connecting the charging hopper 4 and the dechlorination furnace 12, and the width of the charging pipe 11 side of the dechlorination furnace 12 is increased. Thereby, it is possible to prevent the waste plastic 2 from adhering to the high-temperature wall surface and clogging in the charging pipe 11.

(2) In the present invention, a partition plate 16 is provided inside the dechlorination furnace 12. This partition plate 16
Is provided so as to surround the outlet on the waste plastic cooling / discharging device 21 side, and acts so that the influence of the stirring by the cutter blade 15 does not affect the discharge. The waste plastic 2 has a very high viscosity even at a high temperature of 350 ° C.
Therefore, the waste plastic 2 may be wound up by the rotation of the cutter blade 15, and the waste plastic may not accumulate on the bottom surface of the dechlorination furnace 12. Therefore, when the cutter blade 15 is rotated without the partition plate 16, sufficient waste plastic does not accumulate at the outlet on the waste plastic cooling and discharging device 21 side, so that waste plastic cannot be discharged sufficiently.

The molten waste plastic 2 wound up by the cutter blades 15 mainly flows down the wall surface from a portion where the cutter blades 15 do not pass. By providing the partition plate 16, the waste plastic 2 that has flowed down is collected here, and the waste plastic cooling and discharging device 21 is provided.
The outlet on the side is plugged with plastic so that the treated waste plastic can be discharged sufficiently.

The dechlorinated waste plastic 2 is
As described above, even at a high temperature of 350 ° C., the viscosity is very high, and is about 500,000 cst. Since the temperature is low near the inlet pipe 11 of the waste plastic 2, the viscosity is high and it is very difficult to flow.

When the waste plastic is divided into small amounts and charged as in the present invention, there is a concern that untreated waste plastic is discharged. However, waste plastic 2
Is very viscous, and since the waste plastic does not flutter under vacuum in the dechlorination furnace 12, the inlet of the waste plastic cooling / discharging device 21 side is about 1. If it is separated by more than 5 times, it will not be discharged outside the furnace without any treatment.

The residence time of the waste plastic 2 in the dechlorination furnace 12 is determined by the number of inputs, the input amount per discharge, and the discharge amount.
A residence time of 5 minutes to 2 hours is required. Further, the partition plate 16 can prevent the waste plastic from being discharged without being sufficiently dechlorinated.

In addition, when waste plastics are introduced little by little according to the present invention, hydrogen chloride gas and organic gas generated along with decomposition of vinyl chloride are also emitted little by little, so that the apparatus for gas treatment can be small, and the production is small. Energy and material waste associated with the above can be saved.

(3) In the present invention, the heater 20 is installed inside the gas exhaust pipe 19 connecting the dechlorination furnace 12 and the phthalic acid recovery device 26. Waste plastic from households collected separately by municipalities contains large amounts of PET and plasticizers. When such waste plastic is dechlorinated, a large amount of terephthalic acid in which PET is decomposed, phthalic anhydride in which plasticizer is decomposed, and the like are produced. Terephthalic acid crystallizes at 300.degree. C. and phthalic anhydride crystallizes at 130.degree. By arranging the heater 20 inside the gas exhaust pipe 19, the exhaust pipe 19 is not blocked by the heat from the heater 20. Further, when the heater 20 is wound around the outer surface of the exhaust pipe 19, heat escapes to the outside of the exhaust pipe, so that there is much waste.

By arranging the heater 20 inside the exhaust pipe 19 as in the present invention, the heater 20 is insulated, so that there is no waste of energy, the installation is very simple, and the maintenance is easy. Further, even when the apparatus is started, pipes that have a large amount of heat escaped are usually hard to warm up. However, according to the present invention, the heater 20 inside the exhaust pipe 19 is quickly warmed up, so that it can be operated immediately after energization, and waste is reduced. .

(4) In the present invention, a pressure holding device 31 containing oil is provided between the phthalic acid recovery device 26 and the vacuum pump 35, and the height of the oil to be charged into the pressure holding device 31 is adjusted. The internal pressures of the dechlorination furnace 12 and the phthalic acid recovery device 26 can be easily maintained in the appropriate pressure range of 1 kPa to 40 kPa for dechlorination and recovery of phthalic acids.

Since terephthalic acid and phthalic anhydride are sublimated when the pressure is reduced, the recovery efficiency is deteriorated when the pressure of the phthalic acid recovery device 26 is too low. The higher the pressure, the better the recovery efficiency, but in reality, it is sufficient if the pressure is 5 kPa or more. By providing such a pressure vessel 31, such conditions can be easily achieved, and even if air is sucked from the inlet of the vacuum pump 35 due to the presence of oil, oxygen flows into the dechlorination furnace 14 side. Never. If a very high concentration of hydrogen chloride gas is sucked into the vacuum pump 35, the damage due to corrosion of the vacuum pump 35 becomes severe, so that the life is significantly shortened. Thus, the life of the vacuum pump 35 can be greatly extended by sucking dry air or the like from the inlet of the vacuum pump 35 to reduce the gas. When oxygen flows into the dechlorination furnace 14, harmful substances such as dioxin are generated because the temperature of the dechlorination furnace 14 is high. However, by providing such a pressure holding device 31, oxygen can be prevented from flowing into the dechlorination furnace 14, and a sufficient amount of dilution gas such as air can be sucked by the vacuum pump 35. In addition, phthalic acids that could not be removed in the phthalic acid recovery tank enter into the oil of the pressure retainer 31, but this oil can be replaced easily when a large amount of crystalline material such as phthalic acid is dissolved, so that the function can be easily completed. To recover. Although a mechanical pressure retainer 31 is possible, it requires disassembly and cleaning. On the other hand, if the pressure is maintained with oil, the labor required for maintenance can be greatly reduced, and the oil can be incinerated later, so that post-processing is also easy.

(5) The suction hopper 4 according to the present invention is provided with the suction pipe 3 in the tangential direction, and the swirling flow is also generated by the air suction pipe 5b, so that the plastic sucked into the hopper 4 is subjected to centrifugal force. And is not sucked into the blower 5. Therefore, the life of the blower 5 is extended, and the exhaust gas from the blower 5 is also clean, so that there is no need to perform any extra processing.

(6) The cleaning blade 8 scrapes off oil and phthalic acid adhering to the vicinity of the charging valve 10 to prevent the charging pipe 11 from being blocked.

(7) According to the present invention, the waste plastic cooling / discharging device 21 can take out the dechlorinated waste plastic as solidified chips, so that it can be used as fuel as it is. The discharge temperature from the waste plastic cooling / discharging device 21 is set from 100 ° C. to 170 ° C. at which the waste plastic is in a semi-molten state, and the waste plastic is scraped off by the scraping cutter 53 and the scraping blades 51a. In this temperature range, chipped waste plastics do not stick to each other, but are soft like clay. Therefore, if the waste plastic 2 entangles with the screw 51, the pipe will be closed. According to the present invention, by the scraping cutter 53 and the scraping blades 51a, the waste plastic discharged from the screw 51 is promptly removed, and the pipe does not become blocked.

(8) The cutter blade 15 according to the present invention
As shown in FIG. 4, the cutting edges 1 at both ends of the cutter blade 15
5a is a single blade and is point-symmetric with respect to the center point of the cutter blade 15. Further, the cutting edge 15a viewed from the axial direction is provided with an R portion of 1 / 5-1 / 2 (preferably 1/3) of the inner diameter of the dechlorination furnace 12. Waste plastic is a fluid having a high viscosity of about 500,000 CST even at 350 ° C. When such a highly viscous fluid is stirred by a blade having no R portion, it is strongly entangled with the blade and the shaft. In the case of the continuous treatment, the waste plastic 2 needs to flow from the input pipe 11 toward the outlet, but the waste plastic does not flow at all by entangled with the cutter blade.

As in the present invention, the blade tip 15a has a furnace inner diameter of 1 mm.
In the case where the R portion of / 2-1 / 5 is attached and the shape is receded backward with respect to the traveling direction of the cutter blade 15, waste plastic entanglement with the cutter blade 15 can be eliminated, and the flow of waste plastic is prevented. Absent. Further, by making the cutter blade 15 point-symmetric, the cutter blade 1
5 can effectively create a new surface on the molten waste plastic and help dechlorination, and the tangling of the waste plastic is small, so that the power to rotate the cutter is very small and energy saving. In addition, by increasing the gap G between the cutter blade 15 and the wall, the gap and the scrap other than plastic become extremely strong, and the power is also reduced.
When the gap G is actually set to about 1/2 to 1 times the crushed size of the waste plastic before being put into the dechlorination furnace, effective stirring and cutting performance can be obtained, and the cutter blade 1
The balance with the rotational power of 5 can be obtained.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 5 and FIG.
2, two (plural) charging hoppers 4b, 4c are connected via charging valves 10a, 10b. In this case, the waste plastic is charged into the dechlorination furnace 12b by operating the charging hoppers 4b and 4c alternately. That is, the waste plastic is first sucked into the hopper 4b, degassed, and charging is started. The waste plastic is sucked up into the hopper 4c during the charging by the hopper 4b. Next, deaeration and charging are performed from the hopper 4c. This operation is repeated one after another. The dechlorination furnace 12a is heated to a temperature of about 330 ° C. by the heat medium supplied from the heat medium heating device 18b.
Inside the dechlorination furnace 12, the cutter blade 15 b rotates and stirs the waste plastic 2. 330 in the dechlorination furnace 12b
When heated at about ℃, vinyl chloride in the waste plastic 2 is thermally decomposed and hydrochloric acid gas and other organic gases (DOP,
Phthalic anhydride, etc.). By the action of this hydrochloric acid, P
ET also decomposes to generate terephthalic acid. These gases flow from the dechlorination furnace 12b into the phthalic acid recovery device 58 via the gas exhaust pipe 19 having the heater 20, and the high boiling components such as terephthalic acid, phthalic anhydride and DOP are condensed and recovered.

That is, as shown in FIG. 6, the phthalic acid recovering device 58 is placed horizontally and has a cooling cylinder 58a composed of a pair of cylindrical bodies having an inlet pipe 56 and an outlet pipe 62.
And a pair of shafts 59 disposed in the cooling drum 58 a and having a screw 60 on the outer periphery. Each shaft 59 is driven by a motor 61. A collection tank 66 is connected to the cooling drum 58a via a discharge pipe 63 and a valve 64. In the collection tank 66, a container 65 supported by a frame 69a is provided. The frame 69a is connected to the base 70a via a pin 71a.

Further, a valve 67a is provided in the collection tank 66.
Is connected to the vacuum pump 68a via the.

As shown in FIG. 6, the phthalic acid recovering device 58
Inside, high-boiling organic substances such as terephthalic acid, phthalic anhydride, DOP and the like attached to the wall of the cooling cylinder 58a are scraped off by the screw 60, and the screw 60 further agitates the gas to promote cooling. When the high-boiling organic matter is scraped off, what remains in the phthalic acid recovery device 58 is hydrochloric acid gas and low-boiling organic gas.

These then flow from the phthalic acid recovery unit 58 to the heat exchanger 69 via the valve 67. Heat exchanger 69
A water spray nozzle 68 is provided at the inlet, and sprays water to the heat exchanger 69. The water absorbs the hydrochloric acid in the gas, and the hydrochloric acid in the gas is recovered here. In this case, the temperature of the sprayed water rises because the absorption of hydrochloric acid is an exothermic reaction, but the sprayed water wets the wall of the heat exchanger 69 and is cooled by the heat exchanger 69.

Although the organic matter flows into the heat exchanger 69, the organic matter tends to adhere to the wall. However, the surface of the heat exchanger 69 is kept clean by the hydrochloric acid aqueous film. The oil condensed with the hydrochloric acid then flows into the collection container 70. The heat exchanger 69 is further provided with a pressure regulator 71 at the subsequent stage, and the pressure regulator 71 is filled with water 72. This pressure retainer 71 absorbs hydrochloric acid, and heat exchanger 69, phthalic acid recovery device 58,
And the pressure of the dechlorination furnace 12b is kept at about 0.1 atm.

Since the vapor pressure of hydrochloric acid is very low, even if it is about 0.1 atm, the absorption effect on water hardly changes. The gas after removing the hydrochloric acid gas is mainly a very light gas of C4 or less. These gases are sent to a condenser 75 by a vacuum pump 74. The condenser 75 mainly condenses and removes the evaporated water, dilutes the gas with a blower 78, oxidizes the remaining gas with an oxidation catalyst 77, and discharges the remaining gas to the atmosphere.

On the other hand, the waste plastic charged into the dechlorination furnace 12b is dechlorinated, and is pushed by the waste plastic which is successively supplied, and reaches the inlet of the screw transfer device 80. The screw transfer device 80 always rotates and takes out the waste plastic that has reached the inlet from the dechlorination furnace 12b and sends it to the waste plastic cooling and discharging device 82. A female screw 84 is provided inside the waste plastic cooling and discharging device 82, and a rotary drum 85 a is provided inside the female screw 84. The female screw 84 and the rotating body 85a are connected to the cooling jacket 8
3, the waste plastic enters the gap between the rotary drum 85a and the female screw 84 and is cooled.
5 and is collected in a container 87. The rotating drum 85a is driven by a motor 86.

(1) According to the present embodiment, since the two charging hoppers 4b and 4c are provided, they can be operated alternately. When the waste plastic is introduced from the hoppers 4b and 4c, the waste plastic existing before the introduction into the portion where the hoppers 4b and 4c are provided is mixed with the introduced cold waste plastic and the temperature of the waste plastic is lowered. Therefore, when the same feeding hopper is successively charged, the temperature of the waste plastic at the lower portion of the charging hopper drops significantly. The viscosity of the waste plastic is related to the temperature. When the temperature is high, the viscosity is low, but when the temperature is low, the viscosity becomes very large. Further, at a temperature of 150 ° C. or lower, waste plastic discharged from general households is solid. For this reason, if the temperature of the waste plastic is too low due to the continuous charging, the stirring by the cutter cannot be continued. Therefore, by providing a plurality of charging hoppers 4b and 4c and alternately charging the waste plastics, it is possible to prevent the temperature of the waste plastics in the dechlorination furnace 12b from being excessively lowered.

(2) In the present embodiment, the screw 60 is installed in the phthalic acid recovery device 58 in the lateral direction. By installing the screw 60, the cooling cylinder 58
a The dirt on the wall surface can be constantly scraped off, and the thickness of the dirt becomes constant, so that a constant performance can be obtained over a long period of time. In addition, when the screw 60 is placed horizontally, maintenance is easy in the case of manufacturing a large device, and the roof of the factory can be designed low, thereby saving energy.

(3) In the present embodiment, a water spray nozzle 68 is provided at the inlet of the heat exchanger 69 to absorb hydrochloric acid gas. Water spray nozzle 68
The water from the water spray nozzle 68 need only be sufficient to obtain about 20% hydrochloric acid, since the water and steam from the water is immediately cooled by the heat exchanger 69. Water spray nozzle 6
The water from 8 absorbs hydrochloric acid and evaporates once, and the heat exchanger 69
Since the heat is condensed on the surface, the heat transfer surface of the heat exchanger 69 is kept clean. Further, downstream of the heat exchanger 69, a water pressure holding device 7 is provided.
1 is provided, the hydrochloric acid gas can be absorbed by the pressure holding device 71 without being sucked into the vacuum pump 74. Therefore, the life of the vacuum pump 74 can be extended, and the amount of waste hydrochloric acid can be reduced.

(4) In this embodiment, the dechlorination furnace 1
Screw transfer device 8 for removing plastic from 2b
0 and a waste plastic cooling and discharging device 82 are separately installed,
A female screw 84 is provided on the inner periphery of the cooling / discharging device 82,
Further, the female screw 84 and the rotating body 85a are
The female screw 84 is provided and the rotating drum 8
By cooling 5a, the cooling area can be maximized. In addition, since the cooling area can be maximized, the processing capacity is high, which is suitable for a large-sized apparatus.

Further, in order to efficiently discharge the molten waste plastic, it is necessary to rotate the screw transfer device 80 at a certain speed. When the size of the cooling / discharging device 82 is increased, the larger the diameter of the cooling / discharging device 82, the larger the cooling area can be. However, it is necessary to increase the diameter of the cooling / discharging device 82. When the cooling / discharging device 82 having a large diameter is rotated at a high speed to remove the waste plastic from the dechlorination furnace 12b, the plastic may not be cooled at all due to heat generated by the viscosity of the waste plastic. According to the present invention, the screw transfer device 80 can be rotated at an optimum rotation speed, while the cooling and discharging device 82 can be rotated at a low speed that can avoid viscous heat generation. Therefore, useless cooling due to viscous heat generation and useless motor power are not consumed.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment shown in FIGS. 7 and 8, pretreatment is performed on waste plastic put into the dechlorination furnace 12, and the configuration after the dechlorination furnace 12 is shown in FIGS. First embodiment shown in FIG.
And is substantially the same as the second embodiment shown in FIG.

FIG. 7 shows a basic processing flow of the waste plastic processing apparatus according to the present invention. In FIG. 7, the part shown by the solid line indicates the processing, the part shown by the broken line indicates the output generated by the processing, and the part shown by the dashed line indicates the input required for the processing.

Waste plastic discharged from ordinary households is usually put in a plastic bag and collected by a garbage truck.
Acceptable waste plastic will be in plastic bags. Waste plastic in such a package is first crushed (or broken) by a crusher. Next, magnetic waste such as iron scraps that can be removed with a magnet is removed.

Then, the mixture is further crushed by a crusher to obtain several millimeters to 5
The fluff has a size of about 0 mm. Next, the water content is increased by spraying water with a spray device. Waste plastic can contain up to about 40% of water.
Next, when centrifugal dehydration is performed by a centrifugal dehydrator, in the case of waste plastic from ordinary households, the water content can be reduced to about 10% or less. Here is a maximum of 1 waste plastic
%, Usually about 0.2%,
It can be dropped to 4 or less. Next, the waste plastic is dried by hot air in a dryer. The hot air used in the dryer uses waste heat from the dechlorination furnace 12. Hot air drying of fluffy waste plastic can reduce the water content to about 0.5% or less.

From the waste plastic thus dried, aluminum and stone are then removed by a wind separator. The wind separator may be used immediately after the pulverization, but it is more efficient to dry it to some extent. The waste plastic from which the iron, aluminum, stones, and moisture have been removed in this way is fed into the dechlorination furnace 12. The waste plastic dechlorinated in the dechlorination furnace 12 is cooled and discharged by the cooling and discharging device 21 and discharged as fuel. The phthalic acids and hydrochloric acid gas generated during the dechlorination are recovered as phthalic acid and hydrochloric acid in the phthalic acid recovery device 26 and the hydrochloric acid absorption tower 40, respectively. Phthalic acid is used as fuel, hydrochloric acid is reused, and the remaining gas is burned.

FIG. 8 shows an example of the wind separation device 80 according to the present invention. As shown in FIG. 8, the wind separation device 80 includes a separation tube 80a provided in a vertical direction, a suction tube 81 for supplying waste plastic to the separation tube 80a, and a separation tube 80.
The air pipe 83a is provided at the lower part of the filter a and has a regulating valve 83 with secondary air to blow air, and the discharge pipe 82 is provided at the upper part of the sorting pipe 80a and discharges waste plastic.

Waste plastics discharged from ordinary households include aluminum, iron, stone, glass and the like. The waste plastic fluff containing these impurities is supplied to the suction pipe 81
Sucked from. The specific gravity of plastic is about the same as water, which is around 1, and the specific gravity of impurities made of aluminum, iron, stone, glass, etc. is much larger than plastic, and is 2 or more. The air supplied from the secondary air regulating valve 83 and the air pipe 83 a is blown up to the selection pipe 80 through the selection nozzle 84. The plastic fluff having a low specific gravity rises to the discharge pipe 82 by the wind blown from the sorting nozzle 84 and the wind from the suction pipe 81. On the other hand, impurities such as aluminum and iron are heavy and fall down from the sorting nozzle 84 to be collected in the trash collection tank 87. The average flow velocity of the upward flow in the sorting pipe 80 is set to a flow velocity of about 5 m / s at which the waste plastic fluff sufficiently flies. Similarly, the upward flow velocity of the selection nozzle 84 is also 5 m.
/ S. Since the waste plastic fluff is blown off at this flow rate, the sorting nozzle 84
Those that have fallen to the vicinity can be discharged separately from other heavy waste.

(1) Waste plastics from homes often contain soy sauce and other containers. Some of these containers have leftovers. According to the present embodiment, the remaining soy sauce and the like can be removed only by crushing and centrifugally dewatering. Further, if the water is sprayed in advance and centrifugally dehydrated, the attached salt can be removed. In the case of general waste plastics, the salt content is about 0.2 to 1%. Since the salt is not thermally decomposed and enters the waste plastic fuel as it is, the amount of the salt can be reduced by spray water and centrifugal dehydration.

(2) The wind separation device 80 according to the present invention
By using, heavy waste (aluminum, iron, stone, glass, etc.) contained in the crushed waste plastic fluff can be separated very efficiently. Therefore, since the waste does not enter the waste plastic fuel thus produced, the apparent calorie of the plastic fuel is increased, and the amount of ash remaining after combustion can be greatly reduced.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment shown in FIG. 9, the pretreatment is performed on the waste plastic put into the dechlorination furnace, and the structure after the dechlorination furnace is the same as that of the first embodiment shown in FIGS. This is substantially the same as the embodiment and the second embodiment shown in FIGS.

FIG. 9 shows a flowchart according to the present invention. FIG.
In the above, crushing, magnetic sorting, crushing, water spraying, centrifugal dehydration, and wind sorting are performed on waste plastics as pretreatment for dechlorination. In this embodiment, since drying is omitted, dechlorination is performed next, and the obtained waste plastic is cooled and discharged to be used as waste plastic fuel.

When water is removed only by centrifugal dehydration, the waste plastic put into the dechlorination furnace 12 contains 5 to 5 moisture.
About 20% will be included. Most of the water contained in the waste plastic is cooled as hydrochloric acid together with phthalic acids and condensed and recovered. 20% hydrochloric acid gas dissolves in water, so the water content of waste plastic is 10%
Then, the amount of hydrochloric acid gas absorbed by the water becomes 2.5%. Generally, hydrochloric acid generated by dechlorination of waste plastic is about 3% of the net weight of the waste plastic to be treated, and about 2.7% of the entire waste plastic having a water content of 10%. That is, about 90% of the hydrochloric acid in the waste plastic containing 10% of water is recovered by the phthalic acid recovery device 26 together with the phthalic acids. The phthalic acids mixed with hydrochloric acid recovered by the phthalic acid recovery device 26 and the remaining hydrochloric acid gas that has not been completely recovered are incinerated at a high temperature by an incinerator. Hydrochloric acid is the most stable substance as a chlorine compound. High-purity hydrochloric acid can be obtained from phthalic acids mixed with hydrochloric acid when the organic matter is eliminated by incineration at a high temperature. The incineration gas is quenched to prevent dioxin generation, and hydrochloric acid is recovered.

When the amount of water contained in the waste plastic increases, the amount of water entering the high-temperature incineration and quenching process increases. The lower the water content, the higher the concentration of hydrochloric acid can be obtained.

The water spray may be omitted if the amount of salt in the waste plastic collected by the municipalities is small. Up to 40% as waste plastic can be painted on rainy days
Things contain moisture. Since the latent heat of evaporation of water is large, centrifugation saves energy.

(1) As a method of obtaining high-purity hydrochloric acid from hydrochloric acid mixed with an organic substance, a method of incinerating hydrochloric acid at a high temperature is often used. If it is completely burned at a temperature of 1200 ° C. or more and a sufficient holding time is taken, harmful substances such as dioxin are completely incinerated, and it is safe. However, burning at high temperatures requires a large amount of fuel. According to the present invention, phthalic acids are incinerated as the main fuel, so that only a small amount of auxiliary fuel is required.
In addition, a high concentration of hydrochloric acid can be obtained by reducing the amount of water in the waste plastic to be treated.

(2) The phthalic acids generated by the thermal decomposition of waste plastic are crystalline substances, and if they do not contain water, they are recovered in a clay-like state. In the present embodiment, phthalic acids are softened because the waste plastic to be charged contains some water, and handling becomes very easy. Therefore, it can be easily transferred by a positive displacement pump such as a gear pump, and the operator does not need to handle organic matter. In addition, they are released into the atmosphere, eliminating concerns about pollution.

[0084]

As described above, according to the present invention, chlorine can be efficiently removed from waste plastic containing vinyl chloride. In addition, waste plastic from which chlorine has been removed can be used as fuel, and hydrochloric acid and oil can be effectively recovered.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a waste plastic processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a phthalic acid recovery device

FIG. 3 is a diagram showing a waste plastic cooling / discharging device and a buffer tank.

FIG. 4 is a view showing a cutter blade;

FIG. 5 is a schematic diagram showing a waste plastic processing apparatus according to a second embodiment of the present invention.

FIG. 6 shows a phthalic acid recovery device.

FIG. 7 is a flowchart showing a waste plastic processing apparatus according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a wind power sorting device.

FIG. 9 is a flowchart showing a waste plastic processing apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 4, 4b, 4c Input hopper 12, 12b Dechlorination furnace 15 Cutter blade 19 Gas exhaust pipe 20 Heater 21 Waste plastic cooling / discharging device 22 Buffer tank 26, 58 Phthalic acid recovery device 31 Pressure regulator 51, 60 Screw 58a Cooling drum

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsumi Matsuo 2-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term in Toshiba Keihin Works 4F301 AA17 CA09 CA25 CA43 CA52 CA62 CA72 CA73 4H029 CA12 CA14

Claims (13)

[Claims] 1. A dechlorination furnace which has cutter blades rotating about a shaft and heats and dechlorinates waste plastic containing vinyl chloride, and a process for generating gas from the dechlorination furnace to remove hydrochloric acid and oil. A waste plastic processing apparatus comprising: a generated gas processing apparatus for recovery; and a gas exhaust pipe having a heater provided between the dechlorination furnace and the generated gas processing apparatus. 2. A dechlorination furnace for heating and dechlorinating waste plastics containing vinyl chloride having cutter blades rotating around a shaft, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste plastic processing apparatus comprising: a generated gas processing apparatus to be recovered; and the generated gas processing apparatus includes a pressure holding device for keeping a pressure of the generated gas constant. 3. A dechlorination furnace having cutter blades rotating about a shaft for heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A generated gas processing device for recovering, the generated gas processing device has a heat exchanger for recovering hydrochloric acid, and the heat exchanger is provided with a spray nozzle for spraying water into the heat exchanger. Waste plastic processing equipment. 4. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A generated gas processing device for recovering, the generated gas processing device has a phthalic acid recovery device, and the phthalic acid recovery device is placed horizontally and has a cylindrical cooling cylinder provided with an inlet pipe and an outlet pipe; And a screw disposed in the body. 5. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. The dechlorination furnace has a cylindrical shape, the cutter blade has a point symmetrical shape with the shaft as the center, and both ends of the cutter blade face rearward in the direction of rotation of the cutter blade. Retreating and having a radius of 1 / 5-1 / 2 of the inner diameter of the dechlorination furnace
A waste plastic processing apparatus, wherein a gap of 5 to 50 mm is formed between the dechlorination furnace and both ends of the cutter blade. 6. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste gas cooling and discharging device and a buffer tank are connected to the dechlorination furnace.The waste plastic cooling and discharging device is equipped with a cooling jacket and a screw provided in the cooling jacket to send waste plastic. And a scraper blade connected to the screw for scraping the waste plastic into the buffer tank. 7. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste plastic processing apparatus, comprising: a generated gas processing apparatus for recovery; and a waste plastic cooling / discharging apparatus for adjusting the temperature of the waste plastic to 100 to 200 ° C. 8. The waste plastic processing apparatus according to claim 7, wherein the outer diameter of the screw is gradually reduced toward the scraping blade. 9. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste gas cooling and discharging device is connected to the dechlorination furnace, and a partition plate for storing molten plastic is provided on the waste plastic cooling and discharging device side in the dechlorination furnace. Waste plastic processing equipment characterized by the above-mentioned. 10. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste plastic processing apparatus comprising: a generated gas processing apparatus for recovery; and a charging hopper provided above a dechlorination furnace through a cleaning blade. 11. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A waste plastic processing apparatus comprising: a generated gas processing apparatus for recovery; and a plurality of charging hoppers provided above the dechlorination furnace. 12. A dechlorination furnace having cutter blades rotating about a shaft and heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. A crushing and dewatering device for pre-processing waste plastics is provided upstream of the dechlorination furnace. This crushing and dewatering device is equipped with a crusher for crushing waste plastics and spray water for waste plastics. A waste plastic treatment device, comprising: a spray device for applying water; and a centrifugal dehydrator for dehydrating waste plastic. 13. A dechlorination furnace having cutter blades rotating about a shaft for heating and dechlorinating waste plastic containing vinyl chloride, and treating a gas generated from the dechlorination furnace to remove hydrochloric acid and oil. An exhaust gas treatment device for recovery is provided, and a wind separator for pretreatment of waste plastic is provided upstream of the dechlorination furnace. This wind separator is a vertically installed sorting pipe and a waste plastic A supply pipe for supplying waste air, an air pipe for blowing air to waste plastic provided at a lower part of the sorting pipe, and a discharge pipe for discharging waste plastic provided at an upper part of the sorting pipe, Waste plastic processing equipment.