JP2000186285A - Equipment for removing foreign substance/residue in waste plastic liquefaction plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removing foreign substance/residue in a waste plastic liquefaction plant which prevents sedimentation/clogging of foreign substances in a centrifugal separator and piping and can perform a stabilized operation of the centrifugal separator. SOLUTION: The device for removing foreign substance/residue in a waste plastic liquefaction plant comprises a gravity sedimentation tank 40 provided on the way of a circulating line 30 which takes a thermal decomposition oil out of the bottom 21 of a thermal decomposition tank 20 to circulate it to the body 22 of the thermal decomposition tank 20, a branched line 34 having a flow adjusting device 35 provided in the circulating line 30 downstream of the sedimentation tank 40, the branched line 34 being connected with a centrifugal separator 50, a means 52 for discharging separated residues provided at the bottom 51 of the centrifugal separator 50, and a circulating line 60 for the thermal decomposition oil provided at the separated liquid discharging part 53 which returns the separated thermal decomposition oil to the thermal decomposition tank 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing contaminants and residues in waste plastic oiling equipment for thermally decomposing waste plastics to liquefy.

[0002]

2. Description of the Related Art Conventionally, when waste plastics in municipal waste are oiled, sand, glass, metal,
Relatively large, for example, 1 m in diameter, such as resin that is not suitable for oiling
m is unavoidable. For this reason, waste plastic oiling equipment that thermally decomposes waste plastic to make it oily is provided with a pretreatment section for removing foreign substances from the waste plastic, crushing the waste plastic in the pretreatment section, and then sorting the belt separator and magnetic force. Metals and resins that are not suitable for oiling are removed by a machine or the like, and used as oiling raw materials. After that, the oily raw material is thermally decomposed in the oily processing section to obtain gasoline, kerosene, light oil, etc. In a pyrolysis tank for thermally decomposing the oily raw material, the plastic is decomposed into pyrolyzed oil and carbon residues. As a method for separating the cracked pyrolysis oil and the carbon residue, for example, as disclosed in JP-A-6-328441, the pyrolysis oil mixed with the carbon residue is put into a centrifugal separator and treated. There is a method in which carbon residue having a high specific gravity is separated into pyrolysis oil having a low specific gravity, and the carbon residue is discharged to the outside by a screw conveyor provided below a centrifuge.

[0003]

However, the above-mentioned conventional waste plastic oil converting equipment has the following problems to be solved. (1) Although foreign matter is removed in the preprocessing section, it is difficult to completely remove the foreign matter. Therefore, the oily feed to be supplied to the pyrolysis tank is relatively small, for example, the diameter is 1 to several mm.
It is inevitable that foreign matter is mixed to a certain extent, and the foreign matter settles out of the pyrolysis tank in the centrifuge or the pipe, causing a blockage, which hinders the operation of the oiling equipment. (2) When foreign matter enters the centrifugal separator, the separation performance is divided into foreign matter discharge, and the separation efficiency of residues such as carbon sludge decreases. (3) Since the centrifuge is a precision machine that rotates at high speed,
If a large foreign substance enters, blockage or failure occurs in the centrifuge. (4) When the centrifugal separator is provided in the heating line of the oil converting equipment, the flow rate of the heating line changes by manipulating the supply amount of the pyrolysis oil mixed with the carbon residue to the centrifugal separator, and the centrifugal separator becomes stable. It is difficult to operate oil conversion equipment. The present invention has been made in view of the above circumstances, and a foreign matter / residue removing device of a waste plastic oiling equipment capable of preventing a sedimentation / clogging of foreign matter in a centrifuge and a pipe and stably operating the centrifuge. The purpose is to provide.

[0004]

According to the present invention, there is provided an apparatus for removing contaminants and residues of a waste plastic oil converting facility according to the present invention, comprising:
A foreign matter / residue removal device in a pyrolysis tank of a waste plastic oiling facility, wherein a gravity sedimentation tank is provided in the middle of a circulation pipe that takes out the pyrolysis oil of the pyrolysis tank and circulates the oil to the trunk of the pyrolysis tank. A branch pipe having a flow rate adjusting means is provided in a circulation pipe downstream of the gravity settling tank, the branch pipe is connected to a centrifugal separator, and a discharge means for discharging the separated residue is provided at a lower part of the centrifuge. In addition, a pyrolysis oil circulation line for returning the separated pyrolysis oil to the pyrolysis tank is provided. As a result, the pyrolysis oil taken out of the pyrolysis tank is sent to the gravity settling tank, where foreign matter mixed in the pyrolysis oil is settled and separated by gravity, and the pyrolysis oil with less foreign matter is sent to the centrifuge. Therefore, it is possible to prevent clogging and failure of the pipe and the centrifuge due to foreign matter. In addition, the flow rate of the pyrolysis oil with a small amount of foreign matter taken out of the gravity settling tank is adjusted by the flow rate adjusting means, and only a part of the pyrolysis oil is sent from the branch pipe to the centrifugal separator. Fast, for example 6-7m ³ / H
Level, and sedimentation / clogging in the circulation line can be prevented. Here, a flow meter is provided in each of the circulation line on the upstream side of the gravity settling tank and the circulation line on the downstream side of the branch pipe, and the circulation line on the upstream side of the gravity settling tank, A control device may be provided for controlling a flow rate adjusting means provided in the branch pipe based on a flow rate difference from a circulation pipe line on the downstream side of the branch pipe. In this case, the small flow rate sent from the branch pipe to the centrifuge is not measured directly by the branch pipe, but the flow rate between the circulation pipe upstream of the gravity sedimentation tank with high flow rate and the circulation pipe downstream of the branch pipe is measured. Is measured, and the flow rate to be sent to the centrifuge is obtained from the flow rate difference. Therefore, the measurement can be performed in a state where the flow velocity is large, and the measurement instruction is stabilized. In particular, when a venturi-type flow meter having a portion having a narrow cross-sectional area is used, the effect of preventing blockage is great.

[0005] Further, a pyrolysis oil tank for storing the pyrolysis oil may be provided in a pyrolysis oil circulation pipe connecting the centrifugal separator and the pyrolysis tank. In this case, the supply of waste plastic containing a large amount of foreign substances increases the concentration of foreign substances and residues in the pyrolysis tank, and even if there is a danger of clogging, the stored clear pyrolysis oil is stored. Is sent to the thermal decomposition tank in a large amount, the concentration of foreign substances and residues in the thermal decomposition tank can be reduced, and stable operation can be performed. Further, a plurality of thermometers may be provided at a lower portion, an intermediate portion, or an upper portion of the gravity settling tank, and foreign matter removing means may be provided below the gravity settling tank. In this case, if foreign matters such as sand and glass settled in the lower part of the gravity settling tank accumulate, it becomes difficult for convection of the pyrolysis oil to occur,
The heat transfer by convection is reduced, and a temperature difference occurs between the upper and lower pyrolysis oils, that is, a temperature gradient is generated in the gravity settling tank. For example, when foreign matter accumulates, the temperature of the upper part becomes 400 ° C. and the lower part becomes about 390 ° C. Utilizing the relationship between the temperature gradient and the amount of accumulated foreign matter, the temperature of the lower part, the middle part or the upper part of the gravity settling tank is measured, and when the temperature difference becomes, for example, 10 ° C., it is assumed that the foreign matter has accumulated. The discharge speed is determined by the control device in accordance with the amount of accumulated foreign matter, and for example, a double valve is opened as a foreign matter removing means, so that the foreign matter settled in the lower part of the gravity settling tank can be automatically taken out.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an explanatory view showing a configuration of a foreign matter / residue removing device of a waste plastic oiling facility according to an embodiment of the present invention, and FIG. 2 is an operation of the foreign matter / residue removing device of the waste plastic oiling facility. It is a graph which shows a situation.

As shown in FIG. 1, a foreign matter / residue removing device 1 for a waste plastic oiling facility according to one embodiment of the present invention.
In the case of No. 0, the waste plastic is crushed in a pre-processing unit 11 for removing foreign substances of the waste plastic, and metals and resins that are not suitable for oiling are removed by a belt separator or a magnetic separator. It is supplied to the decomposition tank 20 and thermally decomposed. The lower part 21 of the pyrolysis tank 20 is connected to one of the upstream portions 31 of a foreign matter-mixed oil circulation line 30 which is an example of a circulation line for taking out the pyrolysis oil, and a first circulation provided in the middle of the upstream portion 31. The other end of the upstream section 31 is connected to a gravity settling tank 40 via a pump 32 to supply pyrolysis oil. The upper part 41 of the gravity settling tank 40 is connected to one of the downstream parts 33 of the foreign matter-mixed oil circulation line 30, and the other of the downstream parts 33 is connected to the pyrolysis tank 2.
The pyrolysis oil from which the foreign matter has been removed from the upper part 41 of the gravity sedimentation tank 40 by the gravity sedimentation tank 40 is connected to the pyrolysis tank 20. A branch pipe 34 having an inner diameter of, for example, about 40 mm is provided in the middle of the downstream part 33 of the foreign matter-mixed oil circulation pipe 30 so as to be piped downward so that foreign substances and residues are not accumulated. The branch pipe 34 is connected to a centrifuge 50 via a flow control valve 35 so that the pyrolysis oil branched from the downstream portion 33 is supplied to the centrifuge 50. The centrifugal separator 50 separates fine residues (carbon sludge) having a relatively large specific gravity from the supplied pyrolysis oil by centrifugal force. The length of the branch pipe 34 is made as short as possible to prevent clogging by the residue. In the lower portion 51 of the centrifugal separator 50, a residue discharge conveyor 52 is provided as a discharge means for receiving the residue separated from the pyrolysis oil by centrifugal force and falling and continuously discharging the residue to the outside. Note that the residue discharge conveyor 52 is cooled by a water cooling jacket provided therearound, and the temperature of the residue is reduced to, for example, 60 ° C.
To prevent ignition. The separated liquid discharge section 53 provided at the upper part of the centrifugal separator 50 has a pyrolysis oil circulation line 60 for returning the separated pyrolysis oil to the pyrolysis tank 20.
And a pyrolysis oil tank 61 for storing pyrolysis oil and a second circulation pump 62 are provided in the middle of the pyrolysis oil circulation pipe 60.

The first part 31 (upstream of the gravity sedimentation tank 40) of the foreign matter-containing oil circulation line 30 and the downstream part 33 (the downstream side of the branch pipe 34) of the foreign matter-containing oil circulation line 30 are each provided with a first part. , Second flow meters 71 and 72 are provided. The flow control device 73, which is an example of the control device, includes the first and second flow meters 7.
In response to the flow rate values measured at 1, 72, the pyrolysis oil supplied to the centrifuge 50 is operated by operating the flow control valve 35, which is flow control means, according to the flow difference between the upstream section 31 and the downstream section 33. To adjust the flow rate. First and second thermometers 81 and 82 are provided in a lower part 42 and an intermediate part 43 (or upper part 41) of the gravity settling tank 40, respectively.
A double valve 83, which is an example of a highly-sealing foreign matter removing means, including an upper valve 83A and a lower valve 83B for removing foreign matter mixed in the thermal decomposition oil from the lower part 42 is provided below the lower part 42. Further, a valve control device 84 is provided which obtains a temperature difference from the measurement values of the first and second thermometers 81 and 82, determines the discharge speed of the foreign matter from the temperature difference, and controls the operation of the double valve 83. Note that a rotary valve having a high sealing property may be used instead of the double valve 83. The lower part of the double valve 83 communicates with the residue discharge conveyor 52 to discharge foreign substances and residues to the outside. In addition, from the vicinity of the lower part 21 of the pyrolysis tank 20, the oil circulation pipe
A heating circulation line 90 for taking out the pyrolysis oil is provided separately from the heating furnace 9 by a third circulation pump 91.
2, and the temperature of the pyrolysis oil is heated to, for example, 400 ° C. or more, and returned to the upper portion 23 of the pyrolysis tank 20.

[0009] Here, the foreign matter of the waste plastic oil conversion equipment
The operation of the residue removing device 10 will be described. Pyrolysis tank 2
At 0, the liquefied raw material from which the relatively large foreign matter has been removed in the pretreatment unit 11 is supplied, passes from the lower part 21, passes through the upstream part 31 of the foreign matter-mixed oil circulation line 30, and passes through the first circulation pump 32. The pyrolysis oil in a slurry state is supplied to the gravity settling tank 40. Further, from the vicinity of the lower part 21 of the thermal decomposition tank 20, the thermal decomposition oil is sent to the heating furnace 92 through the heating circulation pipe 90 by the third circulation pump 91, and is heated to, for example, 400 ° C. or more, and the upper part of the thermal decomposition tank 20 is heated. Returned to 23. In the gravity sedimentation tank 40, foreign substances mixed in the pyrolysis oil settle and accumulate in the lower part 42. By the way, when the foreign matter accumulates in the gravity settling tank 40, the fluidity of the pyrolysis oil decreases, the heat transfer by convection decreases, and a temperature gradient is generated at the upper and lower measurement positions,
The temperature difference increases according to the amount of foreign matter accumulated. As the amount of foreign matter decreases, the fluidity increases, convection occurs, heat transfer increases, and the temperature difference in the gravity settling tank 40 decreases. First,
The temperature measured by the second thermometers 81 and 82 is input to the valve control device 84, and the temperature difference between the intermediate portion 43 (or the upper portion 41) and the lower portion 42 is, for example, 10 ° C., that is, the intermediate portion 43
When the temperature of the upper (or upper part 41) reaches 400 ° C. and the temperature of the lower part 42 reaches 390 ° C., the double valve 83 is operated by the valve control device 84 to discharge sludge-like foreign matter having a high viscosity. It starts and sends it to the residue discharge conveyor 52. When the temperature difference between the intermediate portion 43 (or the upper portion 41) and the lower portion 42 is small, for example, 3 ° C. or less, the operation of the double valve 83 is stopped assuming that the amount of foreign matter has decreased, and the discharge of foreign material is stopped. Thereby, it is possible to discharge according to the amount of the accumulated foreign matter. The double valve 83 closes the lower valve 83B and opens the upper valve 83A, and removes sludge containing foreign matter from the upper valve 83B.
A and the lower valve 83B.
By closing A and opening the lower valve 83B, the sludge-like foreign matter introduced between the upper valve 83A and the lower valve 83B is quantitatively discharged.

On the other hand, the pyrolysis oil from which foreign matter has been separated in the gravity sedimentation tank 40 is returned from the upper part 41 of the gravity sedimentation tank 40 to the pyrolysis tank 20 through the downstream part 33 of the foreign matter-mixed oil circulation pipe 30. Part of the pyrolysis oil is supplied to the centrifugal separator 50 from the branch pipe 34. The flow rate of the pyrolysis oil supplied to the centrifugal separator 50 is measured by the first and second flow meters 71 and 72, and the flow rate through the flow control valve 35 is automatically controlled by the flow rate control device 73 from the flow rate difference. For example the flow rate of the upstream portion 31 is 7m ³ / H, to operate the flow rate adjustment valve 35 so that the flow rate of the downstream portion 33 supplies a 1 m ³ / H of about pyrolysis oil to 6 m ³ / H, centrifuge 50 enables stable operation. In the centrifugal separator 50, the residue separated from the pyrolysis oil is fed from a lower portion 51 to a residue discharge conveyor 5.
2 and is discharged to the outside by the residue discharge conveyor 52 together with the foreign matter separated in the gravity settling tank 40. From the separated liquid discharge part 53 of the centrifuge 50, the centrifuge 50
The pyrolysis oil from which the residue has been removed is temporarily stored in a pyrolysis oil tank 61 as a buffer through a pyrolysis oil circulation line 60, and is further stored by a second circulation pump 62.
To the thermal decomposition tank 20. Also, the upper part 2 of the pyrolysis tank 20
From 3 the pyrolysis oil vapor is sent to the next formed oil treatment step.

With the above structure, the pyrolysis oil taken out of the pyrolysis tank 20 is sent to the gravity sedimentation tank 40, where the foreign matter in the pyrolysis oil is settled and separated by gravity, and the centrifugal separator 50 removes the foreign matter. Since the supplied pyrolysis oil is supplied, clogging and failure of the centrifuge 50 by foreign matter can be prevented. Further, since the heating circulation line 90, the heating furnace 92, and the third circulation pump 91 form a separate line from the foreign matter-containing oil circulation line 30, the gravity settling tank 40 and the centrifugal separator 50
A stable flow can be maintained without being affected by fluctuations in the amount of pyrolysis oil supplied to the pyrolysis oil, and the processing of the pyrolysis oil in the pyrolysis tank 20 is stabilized. In addition, since a part of the pyrolysis oil from which foreign matter has been removed by gravity in the gravity settling tank 40 is sent from the branch pipe 34 to the centrifugal separator 50 via the flow control valve 35,
The flow rate of the foreign matter-containing oil circulation pipe 30 returned to the pyrolysis tank 20 can be maintained in a large state, for example, about 6 to 7 m ³ / H, and the sedimentation and blockage due to the residue in the foreign matter-containing oil circulation pipe 30 can be prevented. Becomes possible. When the flow rate of the pyrolysis oil supplied from the branch pipe 34 to the centrifugal separator 50 is controlled by the flow control valve 35, a small flow rate (for example, about 1 m ³ / H) sent from the branch pipe 34 to the centrifuge 50 is used. The measurement is not performed directly in the branch pipe 34, and the flow rate is large (for example, 6 to 7 m ³ /
(Approximately H) Since the flow rates of the upstream portion 31 of the foreign matter-mixed oil circulation line 30 and the downstream portion 33 of the branch pipe 34 are measured at a high flow rate, the measurement instruction of the flow meter is stabilized. Also, if the flow rate of the pyrolysis oil is high, blockage of the foreign matter-mixed oil circulation line 30 is unlikely to occur, and it is possible to prevent blockage particularly when a venturi-type flow meter having a portion with a reduced cross-sectional area is used. In addition, by storing clear pyrolysis oil in the pyrolysis oil tank 61, waste plastics containing a large amount of foreign substances is supplied to the pyrolysis tank 20, and the concentration of foreign substances and residues in the pyrolysis tank 20 is increased. Even if the temperature increases, the concentration of foreign substances and residues can be suppressed to a low level by returning a large amount of clear pyrolysis oil, and foreign matters in the pyrolysis tank 20, the foreign-matter-containing oil circulation line 30, the heating circulation line 90, etc. Can be prevented from being blocked. Further, when the settled foreign matter accumulates in the lower part 42 of the gravity settling tank 40, the temperature of the lower part 42 and the intermediate part 43 (or the upper part 41) of the gravity settler 40 is constantly measured, and the sedimentation state of the foreign matter is grasped from the temperature difference. Then, the discharge frequency of the double valve 83 is determined in accordance with the amount of foreign matter accumulated, and the lower part 4 of the gravity settling tank 40 is determined.
Since the foreign matter settled in 2 is automatically discharged, a decrease in the recovery rate of the pyrolysis oil in the gravity settling tank 40 is suppressed.

[0012] Fig. 2 shows foreign matter in the waste plastic oil conversion equipment.
The relationship between the number of operating days of the residue removal device and the residue concentration in the pyrolysis tank is shown. In the conventional configuration, the residue concentration in the pyrolysis tank is 2
It rapidly increased to 27% by weight on the 4th day and 50% by weight on the 4th day, and on the 3rd day when the residue concentration exceeded 30% by weight, the line between the pyrolysis tank and the centrifuge started to be clogged. However, in the configuration of the present embodiment, continuous operation for 60 days is possible until the residue concentration in the pyrolysis tank exceeds 30% by weight. When the waste plastic supply is stopped every two weeks for two days and the foreign matter / residue removal device is operated, the residue concentration in the pyrolysis tank does not exceed 6% by weight, and the continuous operation is performed for a long time. Becomes possible.

[0013]

According to the present invention, there is provided a foreign matter / residue removing device for waste plastic oiling equipment, wherein gravity is taken in the middle of a circulation pipe for taking out pyrolysis oil from a lower portion of a pyrolysis tank and circulating the oil to a body. A sedimentation tank is provided, a branch pipe having a flow rate adjusting means is provided in a circulation line on the downstream side of the gravity sedimentation tank and connected to a centrifuge, and a means for discharging the residue separated from the pyrolysis oil is provided at a lower part of the centrifuge. And a pyrolysis oil circulation pipeline for returning the separated pyrolysis oil to the pyrolysis tank at the top. As a result, the pyrolysis oil taken out of the pyrolysis tank is sent to the gravity settling tank, where foreign matter mixed in the pyrolysis oil is settled and separated by gravity, and the pyrolysis oil with less foreign matter is sent to the centrifuge. Therefore, it is possible to prevent clogging or failure of the pipe or the centrifuge due to foreign matter, and it is possible to increase the separation efficiency of the centrifuge. In addition, since a portion of the pyrolysis oil with less foreign matter taken out of the gravity settling tank is sent from the branch pipe to the centrifuge, the flow velocity of the circulation pipe returning to the pyrolysis tank can be maintained at a high speed, and the flow rate in the circulation pipe is reduced. Stable operation without settling and blockage
Long-term stable operation is possible. The heating circulation line that circulates the pyrolysis oil heated by the heating furnace into the pyrolysis tank is formed as a separate line from the circulation line of the pyrolysis oil mixed with foreign substances. A stable flow can be maintained without being affected by fluctuations in the amount of pyrolysis oil supplied to the machine, and stable processing of the pyrolysis oil in the pyrolysis tank to obtain high-quality pyrolysis oil be able to.

In particular, according to the second aspect of the present invention, there is provided an apparatus for removing contaminants and residues in a waste plastic oil converting facility, wherein a flow meter is provided for each of a circulation line upstream of a gravity settling tank and a circulation line downstream of a branch pipe. A small flow rate sent from the branch pipe to the centrifuge is not measured directly by the branch pipe, and the flow rate between the circulation line upstream of the gravity sedimentation tank and the circulation line downstream of the branch tube is measured by the flow rate. Since the measurement is performed in a large state and the flow rate to be sent to the centrifugal separator is obtained from the flow rate difference, the measurement instruction of the flow meter is stabilized, and it is possible to prevent blockage particularly when a venturi-type flow meter is used. In the foreign matter / residue removing device for waste plastic oil converting equipment according to claim 3, a pyrolysis oil tank for storing pyrolysis oil is provided in a pyrolysis oil circulation line that connects the centrifuge and the pyrolysis tank. Therefore, it is possible to return the amount of clear pyrolysis oil in an amount corresponding to the change in the concentration of foreign substances and residues in the pyrolysis tank, and it is possible to always keep the concentration of foreign substances and residues in the pyrolysis tank low. Therefore, it is possible to prevent blockage of the pyrolysis tank and the respective circulation pipelines due to foreign substances and residues, and to enable long-term stable operation. In the foreign matter / residue removal apparatus for waste plastic oiling equipment according to claim 4, a plurality of thermometers are provided at a lower part, an intermediate part or an upper part of the gravity settling tank, and foreign matter removing means is provided below the gravity settling tank. So that it can be automatically discharged according to the amount of foreign matter settled at the bottom of the gravity settling tank,
A decrease in the recovery rate of the pyrolysis oil is prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a foreign matter / residue removal device of a waste plastic oiling facility according to an embodiment of the present invention.

FIG. 2 is a graph showing an operation state of a foreign matter / residue removal device of a waste plastic oiling facility according to one embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 Foreign matter / residue removal device 11 Pretreatment unit 20 Thermal decomposition tank 21 Lower part 22 Body part 23 Upper part 30 Foreign matter-containing oil circulation line 31 Upstream part 32 First circulation pump 33 Downstream part 34 Branch pipe 35 Flow control valve 40 Gravity sedimentation Tank 41 Upper part 42 Lower part 43 Intermediate part 50 Centrifuge 51 Lower part 52 Residue discharge conveyor 53 Separated liquid discharge part 60 Pyrolysis oil circulation line 61 Pyrolysis oil tank 62 Second circulation pump 71 First flow meter 72 Second Flow meter 73 Flow control device 81 First thermometer 82 Second thermometer 83 Double valve 83A Upper valve 83B Lower valve 84 Valve control device 90 Heating circulation line 91 Third circulation pump 92 Heating furnace

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Eiji Matsukuma Inventor 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Engineering Business Unit (72) Inventor Atsushi Kobayashi Ohara Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture 46-59 New Nippon Steel Corporation Engineering Division F-term (reference) 4D004 AA07 BA03 CA25 CA50 CB44 CB50 DA01 DA02 DA06 DA12 4H029 CA12

Claims (4)

[Claims] An apparatus for removing foreign matter and residues in a thermal cracking tank of a waste plastic oil converting facility, wherein the thermal cracking oil is removed from the thermal cracking tank and circulated through a body of the thermal cracking tank. Is provided with a gravity settling tank, a branch pipe having a flow rate adjusting means is provided in a circulation line on the downstream side of the gravity settling tank, the branch pipe is connected to a centrifugal separator, and separated at a lower portion of the centrifugal separator. A foreign matter / residue removal device for waste plastic oil production equipment, comprising: means for discharging residues; and a pyrolysis oil circulation line for returning separated pyrolysis oil to the pyrolysis tank. 2. The foreign matter / residue removal device of a waste plastic oil converting facility according to claim 1, wherein the flow rate is set to a circulation line upstream of the gravity settling tank and to a circulation line downstream of the branch pipe. A control device for controlling a flow rate adjusting means provided in the branch pipe based on a flow difference between a circulation pipe upstream of the gravity sedimentation tank and a circulation pipe downstream of the branch pipe. A foreign matter / residue removal device for waste plastic oiling equipment, characterized in that: 3. The apparatus for removing foreign matter and residue from waste plastic oil converting equipment according to claim 1, wherein the pyrolysis oil is circulated in a pyrolysis oil circulation line connecting the centrifugal separator and the pyrolysis tank. Foreign matter and residue removal equipment for waste plastic oil liquefaction equipment, which is provided with a pyrolysis oil tank for storing oil. 4. The foreign matter / residue removal device for waste plastic oiling equipment according to claim 1,
A foreign matter / residue removing device for waste plastic oiling equipment, wherein a plurality of thermometers are provided at a lower part, an intermediate part or an upper part of the gravity settling tank, and foreign matter removing means is provided below the gravity settling tank.