JP6066744B2 - Waste plastic oil making equipment - Google Patents

Description

  The present invention relates to a waste plastic oil converting apparatus that heats and gasifies crushed waste plastic together with a gasification catalyst and cools the gas to generate cracked oil.

  2. Description of the Related Art Conventionally, as a waste plastic oil conversion apparatus that generates waste oil by gasification after waste plastic is generated, for example, there is one described in Patent Document 1. The waste plastic oil converting apparatus disclosed in Patent Document 1 includes a dissolution evaporation tank in order to gasify waste plastic.

  In the melting and evaporating tank, crushed waste plastic is introduced from above, and the treated residue is discharged from the bottom. In putting the waste plastic into the melting and evaporating tank, a configuration is adopted in which the waste plastic is sent to the waste plastic inlet formed on the upper wall portion of the melting and evaporating tank by a screw conveyor. The screw conveyor extends upward from the waste plastic inlet.

Japanese Patent No. 4330558

  However, it has been difficult to continuously operate the waste plastic oil converting apparatus in which the waste plastic is charged by the screw conveyor while the waste plastic is being charged by the screw conveyor. The reason why the continuous operation becomes difficult is that the waste plastic is clogged in the waste plastic inlet due to the waste plastic being sent to the high temperature waste plastic inlet.

  When the waste plastic is sent to the high temperature waste plastic inlet, the waste plastic melts and adheres to the wall surface of the waste plastic inlet. When the waste plastic contains foamed polystyrene, a small piece of the foamed polystyrene adheres to the wall surface of the waste plastic inlet by static electricity, and further melts and fuses with heat. That is, the waste plastic inlet is covered with waste plastic over substantially the entire area.

  In this way, the next waste plastic is pressed against the waste plastic adhering to the wall surface of the waste plastic inlet, and the inside of the waste plastic inlet is filled with the waste plastic lump. As a result, as described above, the waste plastic is clogged in the waste plastic inlet.

For this reason, conventionally, continuous operation cannot be performed, and waste plastics have to be oiled by so-called batch processing. That is, in the conventional waste plastic oil converting apparatus, it is necessary to operate so as to repeat the charging process in which a certain amount of waste plastic is charged into the dissolution evaporation tank and the gasification process in which the waste plastic is gasified. .
In such a batch process, a large-sized dissolving / evaporating tank is required so that a large amount of cracked oil can be obtained in a single gasification process, resulting in a problem that the facility scale becomes large.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a waste plastic oil making apparatus that can be downsized by continuous operation.

In order to achieve this object, a waste plastic oil converting apparatus according to the present invention includes a dissolution evaporation tank that stirs a pulverized waste plastic and a gasification catalyst while heating, and a gas generated in the dissolution evaporation tank. Produced by a cracked oil generating device that cools and liquefies, a charging device that feeds the waste plastic into the melting and evaporating tank by a charging screw conveyor extending upward from the upper end of the melting and evaporating tank, and a cracked oil generating device And an additive supply device for supplying an additive containing the decomposed oil and the precipitate in the cracked oil generator into the screw conveyor for charging, the cracked oil generator is generated in the dissolution evaporation tank A precipitation tank to which the liquefied cracked oil is sent by cooling the gas, and the additive supply device adds the content containing the cracked oil and the precipitate at the bottom of the settling tank. It is characterized in that those sent to the closing screw conveyor as.

  According to the present invention, in the invention, the cracked oil generating device includes a settling tank in which the gas generated in the dissolution and evaporation tank is cooled and liquefied cracked oil is sent, and the additive supply apparatus is The contents containing cracked oil and sediment at the bottom of the tank are sent as the additive to the charging screw conveyor.

  According to the present invention, in the above invention, an on-off valve is provided between the charging screw conveyor and the dissolution evaporation tank, and the pulverized waste plastic is used for the charging at an intermediate portion of the charging screw conveyor. A transfer screw conveyor to be supplied to the screw conveyor is connected.

  The present invention is the above invention, wherein the cracked oil generating device is connected to the melting and evaporating tank via a communication path extending upward from an upper end portion of the melting and evaporating tank, and the communication path is connected to the charging screw conveyor. A gas introduction part extending upward from the dissolution evaporation tank to a high position is provided.

  According to the present invention, in the above invention, the lower end portion of the dissolution evaporating tank includes a tapered inclined wall whose inner diameter gradually decreases as it goes downward, and a cylinder extending downward from the lower end of the inclined wall, Is connected to a lower residue recovery unit via a residue discharge opening / closing valve, and the waste plastic and the catalyst are agitated inside the dissolution evaporation tank by rotating about an axis in the vertical direction. An agitation unit is provided, and the agitation unit includes a screw that constitutes a screw conveyor in the dissolution evaporation tank in cooperation with the cylinder, and the screw is disposed in the dissolution evaporation tank during the operation of gasifying waste plastic. The screw conveyor rotates in the upward direction, and when discharging the residue from the dissolution evaporation tank, the screw conveyor rotates in the opposite direction to that during the operation. To.

  According to the present invention, the additive flows down along the inner peripheral surface of the loading screw conveyor or is sent to the charging port while being attached to the waste plastic. For this reason, waste plastic comes into contact with the additive wall surface along with the additive. When the waste plastic comes into contact with the wall surface of the hot inlet, it is easily melted by heat and adheres to the wall surface. However, in this embodiment, it is considered that the additive is mixed into the molten portion of the waste plastic, and this molten portion is chemically dissolved. That is, the viscosity of the adhering portion of the waste plastic is lowered when the waste plastic is dissolved by the additive.

For this reason, the waste plastic does not adhere to the wall surface of the charging port and does not stay there, and is smoothly charged into the dissolution evaporation tank from the charging port.
Therefore, according to the present invention, since the waste plastic does not clog the input port, it is possible to provide a waste plastic oil converting apparatus that can perform continuous operation and can be downsized.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the structure of the waste plastic oil conversion apparatus based on this invention, and the screw conveyor part is fractured | ruptured and drawn in the same figure. It is sectional drawing which shows the structure of the waste plastic oil-ized apparatus which concerns on this invention. In the figure, the stirring unit is drawn without breaking. It is sectional drawing which expands and shows a bearing member. It is a top view which expands and shows a bearing member. It is sectional drawing which expands and shows the lower end part of a dissolution evaporating tank. It is a perspective view of a stirring part. It is a time chart for demonstrating operation | movement of the waste plastic oil-ized apparatus which concerns on this invention.

Hereinafter, an embodiment of a waste plastic oil converting apparatus according to the present invention will be described in detail with reference to FIGS.
A waste plastic oil converting apparatus 1 shown in FIG. 1 includes a gasification section 3 having a heating furnace 2 and a liquefaction section 5 having a cracked oil generating apparatus 4.
The gasification unit 3 has a configuration in which a heating medium tank 6 and a dissolution evaporation tank 7 described later are provided in the heating furnace 2. The gasification unit 3 according to this embodiment includes the heating furnace 2, a heat medium tank 6 and a dissolution evaporation tank 7, a stirring device 8 (see FIG. 2) provided in the dissolution evaporation tank 7, and the heating furnace. 2 and a residue recovery unit 9 located below the unit 2.

  The heating medium tank 6 is for enclosing a heating medium 10 (see FIG. 2) made of oil or the like between the melting and evaporating tank 7, and as shown in FIG. It is formed in a shape that covers from below. A thermometer 11 for measuring the temperature of the heat medium 10 is provided at the upper end of the heat medium tank 6. By measuring the temperature of the heat medium 10 in this way, temperature control when heating in the heating furnace 2 can be easily performed. This is because the temperature of the heat medium 10 is substantially equal to the average temperature of the dissolution evaporator 7.

  As shown in FIG. 2, the heating furnace 2 heats the heat medium tank 6 to a predetermined temperature using the burner 12 as a heat source. The heating furnace 2 according to this embodiment has a cylindrical peripheral wall 13 surrounding the heat medium tank 6 and the dissolution evaporation tank 7, a bottom wall 14 connected to the lower end of the peripheral wall 13, and an upper end of the peripheral wall 13 closed. A partition wall 16 spanned between the upper wall 15 and the heat medium tank 6 and an exhaust port 17 at the upper end are provided. The burner 12 is arranged at the bottom of the heating furnace 2 with the flame directed in the horizontal direction.

The partition wall 16 is for forming a spiral flue 18 extending in the vertical direction around the heat medium tank 6, and is formed in a spiral shape along the outer peripheral surface of the heat medium tank 6. The exhaust port 17 opens at the upper end of the flue 18. Although not shown, an exhaust chimney communicates with the exhaust port 17.
The heat generated in the heating furnace 2 is transmitted substantially uniformly throughout the melting and evaporating tank 7 through the heat medium 10 in the heat medium tank 6. For this reason, the heat of the heating furnace 2 does not concentrate on a part of the dissolution / evaporation tank 7, and the entire dissolution / evaporation tank 7 is heated substantially uniformly. By using the heat medium 10 in this way, the thermal shock to the dissolution / evaporation tank 7 can be relaxed and the dissolution / evaporation tank 7 can be prevented from being damaged. Further, by measuring the temperature of the heat medium 10 with the thermometer 11, temperature control when heating with the burner 12 can be easily performed.

The liquefying unit 5 includes a cracked oil generating device 4 that stores gas after liquefying the gas generated in the dissolution evaporation tank 7. As shown in FIG. 1, the cracked oil generating device 4 includes a gas cooling device 21 for cooling and liquefying the gas generated by the dissolution evaporation tank 7, and a precipitation separating device 22 for storing the cracked oil. It has.
The gas cooling device 21 is connected to a dissolution evaporation tank 7 to be described later via a communication pipe 23, and gas generated in the dissolution evaporation tank 7 is sent through the communication pipe 23. In this embodiment, the communication pipe 23 constitutes a “communication path” according to the third aspect of the present invention.

  The communication pipe 23 includes a gas introduction part 23a that extends upward from the upper end part of the dissolution evaporation tank 7 and a gas transfer part 23b that extends in the horizontal direction from the upper end of the gas introduction part 23a. The gas introduction part 23 a is formed to extend upward from the dissolution evaporation tank 7 to a position higher than the charging screw conveyor 25 of the charging device 24 provided at the upper end of the dissolution evaporation tank 7. Although the details will be described later, the charging device 24 is for charging the waste plastic 26 into the dissolution evaporation tank 7.

The gas cooling device 21 cools and liquefies the gas through, for example, a heat exchanger (not shown). The cracked oil produced by the gas cooling device 21 is sent to first and second sedimentation tanks 27 and 28 provided in the sedimentation separation device 22.
The first and second settling tanks 27 and 28 are for precipitating water and undecomposed waste plastic powder in the cracked oil produced by the gas cooling device 21 and separating them from the cracked oil. The moisture is produced by combining a gas obtained by gasifying the waste plastic 26 with oxygen and hydrogen in the atmosphere. The undecomposed waste plastic powder is obtained by mixing fine waste plastic particles floating in the dissolution evaporation tank 7 with the gas into the gas cooling device 21.

  As shown in FIG. 2, the first and second settling tanks 27 and 28 include oil separator portions 27a and 28a to which cracked oil is sent from the gas cooling device 21, and storage portions adjacent to the oil separator portions 27a and 28a. 27b, 28b, and discharge pipes 27c, 28c connected to the oil separator portions 27a, 28b. The cracked oil is separated from the water, waste plastic powder and the like by the oil separator portions 27a and 28a, overflows from the oil separator portions 27a and 28b, and flows into the storage portions 27b and 28b.

  The 1st sedimentation tank 27 is for storing the cracked oil obtained from the gas produced when the temperature of the dissolution evaporating tank 7 is relatively low. The 2nd sedimentation tank 28 is for storing the cracked oil obtained from the gas produced when the temperature of the dissolution evaporating tank 7 is relatively high. Although not shown, a switching valve that operates according to the temperature of the dissolution evaporating tank 7 is not shown in the conduit 29 that guides cracked oil from the gas cooling device 21 to the first and second settling tanks 27 and 28. Is provided.

The discharge pipes 27c and 28c are for discharging moisture precipitated in the oil separator portions 27a and 28a and undecomposed waste plastic powder. These discharge pipes 27 c and 28 c are connected to a reprocessing pipe 32 constituting a part of the additive supply device 31.
The additive supply device 31 includes the reprocessing pipe 32 and a pump 33 provided in the middle of the pipe 32. The reprocessing pipe 32 connects the discharge pipes 27 c and 28 c and the input screw conveyor 25 of the input device 24. The pipe 32 is provided with a flow meter 34.
The pump 33 sucks up the contents at the bottom of the oil separators 27a and 28a and sends it as an additive to the feeding screw conveyor 25. The contents include the cracked oil, moisture, undecomposed waste plastic powder, and the like. In this embodiment, the undecomposed waste plastic powder corresponds to the “precipitate in the cracked oil generator” according to the first aspect of the present invention.

As shown in FIG. 2, the dissolution evaporating tank 7 includes a cylindrical wall 35 formed in a cylindrical shape, an inclined wall 36 extending downward from the lower end of the cylindrical wall 35, and a lid for closing the upper end of the cylindrical wall 35. And a body 37. The lid 37 constitutes the upper end portion of the dissolution evaporation tank 7.
The cylindrical wall 35 is formed so that the axis is directed in the vertical direction.
The inclined wall 36 is formed in a tapered shape whose inner diameter gradually decreases as it goes downward. A cylinder 38 extending downward is provided at the lower end of the inclined wall 36.

The taper axis formed by the inclined wall 36 and the axis of the cylinder 38 coincide with the axis of the cylinder wall 35. The inclined wall 36 and the cylinder 38 constitute a lower end portion of the dissolution evaporating tank 7.
The cylinder 38 penetrates the heating medium tank 6 and the heating furnace 2 in the vertical direction and protrudes below the heating furnace 2. As shown in FIG. 1, a residue recovery unit 9 is connected to the lower end of the cylinder 38 via an on-off valve 39 made of a ball valve.
The residue collection unit 9 includes a residue transfer screw conveyor 41 connected to the lower end of the on-off valve 39 and a residue storage tank 42 connected to the terminal end of the screw conveyor 41. The screw conveyor 41 for residue transfer is disposed so as to extend in the horizontal direction below the on-off valve 39. The residue storage tank 42 is positioned so as to be located on the side of the heating furnace 2 when viewed from above.

The lid 37 of the dissolution evaporation tank 7 is provided with a driving motor 43 that serves as a power source for the stirring device 8 and a charging device 24, and the communication pipe 23.
The stirring device 8 rotates the stirring unit 44 inserted into the dissolution evaporation tank 7 about the vertical axis.
The charging device 24 includes a charging screw conveyor 25 extending upward from a charging port 45 formed in the lid body 37, and a transfer screw conveyor 46 connected to an intermediate portion of the charging screw conveyor 25. Yes.

  These screw conveyors 25 and 46 have a structure in which conveying screws 25b and 46b are rotatably inserted into the cylinders 25a and 46a, respectively. The conveying screws 25b and 46b of the screw conveyors 25 and 46 are rotated by driving by motors 47 and 48 connected to upstream ends in the feeding direction. The conveying screws 25b and 46b are rotatably supported on the cylinders 25a and 46a by bearings (not shown) that support only the upstream end of the screw. That is, the bearings for supporting the conveying screws 25b and 46b are not provided at the ends of the screw conveyors 25 and 46 on the downstream side in the feeding direction. For this reason, these screw conveyors 25 and 46 can smoothly feed the waste plastic 26 without being blocked by the bearings.

The charging screw conveyor 25 is connected to the dissolution evaporation tank 7 through an on-off valve 49. The reprocessing pipe 32 of the additive supply device 31 described above is connected to the top of the charging screw conveyor 25. That is, the additive is fed into the upper part of the loading screw conveyor 25.
The reprocessing pipe 32 can be connected to a lower portion of the loading screw conveyor 25 and below the transfer screw conveyor 46 as indicated by a two-dot chain line in FIG. In the case where the waste plastic 26 to be input is a polystyrene foam, it is preferable to send the additive from the pipe 27 to the lower portion of the input screw conveyor 25.
The on-off valve 49 is for preventing the gas in the dissolution evaporating tank 7 from leaking from the charging port 45 to the charging screw conveyor 25 side. The on-off valve 49 according to this embodiment is constituted by a gate valve.

  A feeding chute 51 is provided upstream of the transfer screw conveyor 46. The throwing plastic 51 and the gasification catalyst 52 are charged into the charging chute 51. The gasification catalyst 52 is a solid acid catalyst granulated into fine particles used in the fluid catalytic cracking process of petroleum. The waste plastic oil converting apparatus 1 according to this embodiment can use the catalyst after used in the fluid catalytic cracking process of petroleum, that is, the used catalyst, as the gasification catalyst 52.

  The screw 46 b of the transfer screw conveyor 46 is configured to send the waste plastic 26 while compressing it in order to prevent air (oxygen) mixed with the waste plastic 26 from being sent to the downstream side. In this embodiment, in order to realize this, a taper-shaped rotation shaft 46c (see FIG. 2) of the screw 46b is used. The rotating shaft 46c is formed such that the outer diameter gradually increases from the upstream end (the right end in FIG. 2) toward the downstream end.

  After the waste plastic 26 and the gasification catalyst 52 are put into the feeding chute 51, they are sent to the feeding screw conveyor 25 by the transfer screw conveyor 46. It is introduced into the dissolution evaporation tank 7 through the introduction port 45 from above.

  The stirring unit 44 of the stirring device 8 includes a rotating shaft 53 that passes through the lid 37 and extends in the vertical direction, a stirring blade 54 and a screw 55 provided on the rotating shaft 53, and the like. The rotating shaft 53 is supported by the dissolution / evaporation tank 7 at two locations, an upper end portion and a lower end portion. The upper end portion of the rotation shaft 53 is rotatably supported by the lid body 37 in a state where movement in the horizontal direction is restricted by the upper bearing member 56. The motor 43 is connected to the upper end of the rotating shaft 53. The rotating shaft 53 rotates about the vertical axis by driving by the motor 43. The rotating shaft 53 is positioned on the same axis as the dissolution evaporation tank 7.

The motor 43 rotates the rotating shaft 53 in a predetermined direction (hereinafter, this rotation direction is referred to as a normal rotation direction) when the waste plastic 26 is gasified in the dissolution evaporator 7. Further, the motor 43 rotates in a direction opposite to the forward rotation direction (hereinafter, this rotational direction is referred to as a reverse rotation direction) when discharging the residue described later.
The lower end portion of the rotating shaft 53 is supported by a bearing member 57 provided at the lower end portion of the dissolution evaporation tank 7. As shown in FIGS. 3 and 4, the bearing member 57 is supported by a plurality of support columns 58 extending obliquely upward from the inclined wall 36 of the dissolution evaporation tank 7 toward the rotation shaft 53, and these support columns 58. A slide bearing 59 is provided.

  As shown in FIG. 4, the plurality of support columns 58 are arranged radially so that the rotation shaft 53 is located at the center when viewed from above. The bearing member 57 according to this embodiment includes three support columns 58. However, the number of columns 58 can be changed as appropriate. Thus, the support | pillar 58 is arrange | positioned radially, and space S1 (refer FIG. 4) is formed between the support | pillars 58. FIG. Through this space S1, it is possible to pass the waste plastic 26, the gasification catalyst 52, the residue (not shown) left in the dissolution evaporation tank 7 after the processing, and the like.

  The slide bearing 59 is formed in an annular shape with which the rotary shaft 53 is fitted. More specifically, the slide bearing 59 includes a first bearing portion 59 a that supports a disc-shaped flange 60 (see FIG. 3) provided on the rotating shaft 53 from below, and a lower portion of the flange 60 on the rotating shaft 53. The 2nd bearing part 59b with which these site | parts fit is provided. That is, the lower end portion of the rotating shaft 53 is supported by the bearing member 57 so as to be rotatable and restricted in the vertical and horizontal directions. Moreover, the lower end part of the rotating shaft 53 is inserted into the cylinder 38 from above as shown in FIG.

The stirring blade 54 is for stirring the waste plastic 26 and the gasification catalyst 52 in the dissolution evaporation tank 7. As shown in FIGS. 2 and 6, the stirring blade 54 according to this embodiment includes first and second blades 54a and 54b extending in a spiral shape. The first blade 54 a is arranged at a position that is 180 ° out of phase with the second blade 54 b in the rotation direction of the rotation shaft 53.
These first and second blades 54 a and 54 b are respectively attached to the frame 61 and supported so as to rotate integrally with the rotary shaft 53 via the frame 61. The direction of the spiral of each of the blades 54a and 54b is set so that the waste plastic 26 and the gasification catalyst 52 are sent upward when the rotary shaft 53 rotates in the forward rotation direction.

  The size of the first and second blades 54 a and 54 b in the radial direction is set to a size that allows a convection space S <b> 2 (see FIG. 2) to be formed between the inner surface of the dissolution evaporation tank 7. That is, the rotating shaft 53 rotates in the forward rotation direction, and the stirring blades 54 rotate together with the rotating shaft 53, whereby substances in the center of the dissolution evaporation tank 7 (waste plastic 26 and gasification catalyst 52, etc.). ) Is sent from the bottom of the dissolution evaporator 7 to the top. The substance sent to the upper end of the stirring blade 54 falls from above the blade to the convection space S2.

The screw 55 is for sending a substance located around the rotary shaft 53 upward or downward. The screw 55 is configured using a rotating shaft 53. That is, the screw 55 is constituted by a rotating shaft 53 and a spiral blade 62 provided on the outer peripheral portion of the rotating shaft 53.
As shown in FIG. 2, the screw 55 according to this embodiment is provided in a range from the lower end portion to the upper portion of the rotating shaft 53. The upper part of the rotating shaft 53 here is an upper part that is at the same height as the upper end of the stirring blade 54.

  The blades 62 of the screw 55 are formed such that the material around the rotary shaft 53 is sent upward when the rotary shaft 53 rotates in the forward rotation direction. That is, the blades 62 of the screw 55 and the stirring blades 54 are formed so as to be sent in the same direction by rotating.

  The lower end portion of the screw 55 is positioned in the cylinder 38 of the dissolution / evaporation tank 7 as shown in FIG. The lower end of the screw 55 constitutes a screw conveyor 63 in cooperation with the cylinder 38. The screw conveyor 63 sends the substance in the cylinder 38 upward as the screw 55 rotates in the forward direction. Moreover, the screw conveyor 63 sends the substance in the cylinder 38 downward as the screw 55 rotates in the reverse direction.

  Next, operation | movement of the waste plastic oil-ized apparatus 1 by this embodiment is demonstrated using the time chart shown in FIG. First, the burner 12 is ignited at time T1 shown in FIG. At time T2, the gasification catalyst 52 is charged into the dissolution evaporating tank 7. The catalyst 52 is charged using the charging device 24 with the on-off valve 49 opened. After the catalyst 52 is charged by a predetermined amount, at T3, the charging device 24 is stopped and the on-off valve 49 is closed.

  The temperature in the dissolution evaporating tank 7 gradually increases after the burner 12 is ignited, and reaches a predetermined operation start temperature at time T4. This operation start temperature is the lowest temperature at which the waste plastic 26 can be gasified. In this way, the on-off valve 49 is opened in a state where the temperature of the dissolution evaporating tank 7 reaches the operation start temperature, the charging device 24 is started, and the waste plastic 26 is charged into the melting evaporation tank 7.

  The waste plastic 26 is sent to the charging screw conveyor 25 by the transfer screw conveyor 46, and is charged into the dissolution evaporation tank 7 from the charging port 45 by the charging screw conveyor 25. When the inside of the transfer screw conveyor 46 is filled with the waste plastic 26, the waste plastic supply path between the inlet 45 and the atmosphere (chute 51) is blocked.

  At T4, the additive supply device 31 and the stirring device are also started. By operating the additive supply device 31, the additive is supplied into the loading screw conveyor 25. Further, when the stirring device 8 is operated, the rotating shaft 53 is rotated in the forward rotation direction by the motor 43. That is, the waste plastic 26 and the gasification catalyst 52 are sent upward from the center of the dissolution evaporation tank 7 on the upward flow generated by the stirring blade 54 and the screw 55, and pass through the convection space S2. Fall down. Thus, by rotating the screw 55 in the forward rotation direction, it is possible to prevent the waste plastic 26 and the gasification catalyst 52 from accumulating in the lowermost cylinder 38 of the dissolution evaporator 7.

  The waste plastic 26 stirred and heated together with the gasification catalyst 52 in the dissolution evaporation tank 7 evaporates as the temperature rises, and moves to the gas cooling device 21 as a gas. This gas is liquefied by the gas cooling device 21 and flows down to the first and second precipitation tanks 27 and 28 of the precipitation separation device 22 as cracked oil.

In the waste plastic oil converting apparatus 1 according to this embodiment, cracked oil obtained from a gas generated when the temperature of the dissolution and evaporation tank 7 is in a low temperature region is stored in the first sedimentation tank 27. Further, undecomposed waste plastic powder mixed in the cracked oil at this time is stored in the oil separator portion 27a.
When the temperature of the heat medium 10 is raised in a state where the waste plastic 26 is continuously put into the melting and evaporating tank 7, the temperature in the melting and evaporating tank 7 can be raised.

The cracked oil obtained from the gas generated when the temperature of the dissolution evaporating tank 7 is in the high temperature range is stored in the second settling tank 28. That is, according to the waste plastic oil converting apparatus 1 according to this embodiment, the temperature of the heat medium 10 can selectively extract the oil component in the low temperature region and the oil component in the high temperature region. Since the first and second sedimentation tanks 27 and 28 are provided with oil separator portions 27a and 28a, respectively, high-purity cracked oil can be obtained. Undecomposed waste plastic powder contained in the cracked oil generated when the temperature of the dissolution evaporating tank 7 is in a high temperature range is stored in the oil separator portion 28a.
The contents at the bottom of the oil separators 27a, 28a are sent as additives to the feeding screw conveyor 25 by the additive supply device 31.

The additive supplied to the charging screw conveyor 25 flows down along the inner peripheral surface of the cylinder 25 a of the charging screw conveyor 25 or is attached to the waste plastic 26 in the charging screw conveyor 25. Sent up to 45. For this reason, the waste plastic 26 comes into contact with the wall surface of the inlet 45 together with the additive.
When the waste plastic 26 comes into contact with the wall surface of the hot inlet 45, it is easily melted by heat and adheres to the wall surface. However, in this embodiment, it is considered that the additive is mixed in the molten portion of the waste plastic 26 and the molten portion is chemically dissolved. That is, the viscosity of the adhering portion of the waste plastic 26 is lowered when the waste plastic 26 is dissolved by the additive.

For this reason, the waste plastic 26 does not adhere to the wall surface of the charging port 45 and does not stay there, and is smoothly charged into the dissolution evaporation tank 7 from the charging port 45.
In the waste plastic oil converting apparatus 1 according to this embodiment, the waste plastic 26 is charged into the dissolution evaporation tank 7 by a predetermined processing amount. It is desirable that this processing amount be about three times the total amount of the gasification catalyst 52, for example. This is because impurities such as carbon adhere to the surface of the catalyst 52 and the function of the catalyst 52 is impaired.

  After the amount of waste plastic 26 is charged, the charging device 24 and additive supply device 31 are stopped and the on-off valve 49 is closed at time T5 in FIG. Even after the charging device 24 is stopped, the waste plastic 26 and the catalyst 52 are stirred while being heated in the dissolution evaporating tank 7, whereby the waste plastic 26 remaining in the dissolution evaporating tank 7 is gradually reduced. When the remaining amount of the waste plastic 26 decreases, the load on the stirring device 8 decreases accordingly, and the value of the current flowing through the motor 43 decreases. In the waste plastic oil making apparatus 1 according to this embodiment, the motor 43 is stopped and the burner 12 is extinguished at T6 when the value of the current flowing through the motor 43 falls below a predetermined current value.

Thereafter, at time T7 when the dissolution evaporating tank 7 is cooled, the processed residue remaining in the dissolution evaporating tank 7 is discharged downward by a procedure described later.
The bottom of the dissolution evaporating tank 7 is formed by a tapered inclined wall 36 that gradually narrows as the inside of the tank evaporates downward. For this reason, the residue after processing comes to accumulate at the bottom of the dissolution evaporation tank 7.

  In order to discharge this residue from the dissolution evaporating tank 7, the on-off valve 39 is opened, and the rotating shaft 53 of the stirring device 8 is rotated in the reverse direction (opposite to the operation during gasification of the waste plastic 26). That is, at this time, the screw 55 is rotated so that the conveying direction of the screw conveyor 63 is downward. The screw 55 rotating in this manner sends the residue accumulated at the bottom of the dissolution evaporating tank 7 downward from the dissolution evaporating tank 7. Therefore, the residue is discharged from the dissolution evaporating tank 7 through the on-off valve 39 to the lower residue discharge screw conveyor 41 and sent to the residue storage tank 42 by the screw conveyor 41.

Therefore, according to this embodiment, since the waste plastic 26 is not clogged in the charging port 45 by the action of the additive, a waste plastic oil converting apparatus that can be continuously operated and can be downsized is provided. Can be provided.
The cracked oil generating apparatus 4 according to this embodiment includes first and second sedimentation tanks 27 and 28 to which a cracked oil liquefied by cooling a gas generated in the dissolution and evaporation tank 7 is sent. . The additive supply device 31 sends the contents at the bottom of the first and second settling tanks 27 and 28 to the charging screw conveyor 25 as an additive.

Undecomposed waste plastic powder and moisture contained in the cracked oil generated from the waste plastic 26 are precipitated at the bottoms of the first and second settling tanks 27 and 28. In this embodiment, these waste plastic powder and moisture can be included in the additive and returned to the dissolution evaporation tank 7 for reprocessing.
Therefore, according to this embodiment, it is possible to provide a waste plastic oil converting apparatus capable of efficiently converting the waste plastic 26 into oil.

In this embodiment, an on-off valve 49 is provided between the charging screw conveyor 25 and the dissolution evaporation tank 7. A transfer screw conveyor 46 for supplying the pulverized waste plastic 26 to the charging screw conveyor 25 is connected to an intermediate portion of the charging screw conveyor 25.
In the state where the on-off valve 49 is closed, the inlet 45 of the dissolution evaporation tank 7 and the waste plastic supply path are shut off. For this reason, when the melting / evaporating tank 7 is heated to a predetermined reaction temperature, the heat in the tank does not leak through the waste plastic supply path, so the melting / evaporating tank 7 is heated to a temperature at which the reaction can be performed. The time to make it short is economical.

When the inside of the transfer screw conveyor 46 is filled with the waste plastic 26, the waste plastic supply path between the inlet 45 and the atmosphere is blocked.
For this reason, when the waste plastic 26 is introduced during the operation of the melting and evaporating tank 7, the gas in the dissolving and evaporating tank 7 is not released into the atmosphere by going back through the waste plastic supply path.
Therefore, according to this embodiment, it is possible to provide a waste plastic oil making apparatus capable of continuous operation while preventing gas leakage.

  The cracked oil generation apparatus 4 according to this embodiment is connected to the dissolution evaporating tank 7 via a communication pipe 23 (communication path) extending upward from the upper end of the dissolution evaporating tank 7. The communication pipe 23 includes a gas introduction portion 23 a extending upward from the dissolution evaporation tank 7 to a position higher than the charging screw conveyor 25.

The gas in the dissolution evaporating tank 7 flows into the gas introduction part 23 a due to the chimney effect generated in the gas introduction part 23 a and is led to the cracked oil generation device 4.
For this reason, according to this embodiment, since the gas generated in the dissolution evaporating tank 7 can be efficiently sent to the cracked oil generating device 4, the waste plastic 26 can be oiled more efficiently. Can be provided.

In this embodiment, in order to discharge the residue in the dissolution evaporating tank 7 from the waste evaporating tank 7 after the oil plasticization of the waste plastic 26 is completed, the residue discharging on-off valve 39 is opened and the screw 55 of the stirring device 8 is opened. Is rotated so that the conveying direction is downward. The screw 55 sends the residue accumulated at the bottom of the dissolution evaporator 7 downward from the dissolution evaporator 7. For this reason, the residue is discharged from the dissolution evaporation tank 7 through the on-off valve 39 to the lower residue recovery unit 9.
Therefore, according to this embodiment, it is possible to provide a waste plastic oil converting apparatus capable of easily discharging the residue.

  DESCRIPTION OF SYMBOLS 1 ... Waste plastic oil converting apparatus, 4 ... Decomposed oil production | generation apparatus, 7 ... Dissolving evaporation tank, 9 ... Residue collection | recovery part, 23 ... Communication pipe (communication path), 23a ... Gas introduction part, 24 ... Injection apparatus, 25 ... Input Screw conveyor, 26 ... waste plastic, 27 ... first sedimentation tank, 28 ... second sedimentation tank, 31 ... additive supply device, 36 ... inclined wall, 38 ... cylinder, 39 ... residue discharge on-off valve, 44 ... Stirring section, 46 ... Transfer screw conveyor, 49 ... Open / close valve, 52 ... Gasification catalyst, 55 ... Screw.

Claims (4)

A dissolution evaporating tank in which the pulverized waste plastic and the gasification catalyst are stirred while heating;
A cracked oil generator for cooling and liquefying the gas generated in the dissolution evaporation tank;
A charging device for supplying the waste plastic into the melting and evaporating tank by a charging screw conveyor extending upward from the upper end of the melting and evaporating tank;
An additive supply device for supplying an additive containing the cracked oil generated by the cracked oil generator and the precipitate in the cracked oil generator into the screw conveyor for charging ,
The cracked oil generator comprises a settling tank to which a cracked oil liquefied by cooling a gas generated in the dissolution evaporation tank is sent,
The said additive supply apparatus sends the content containing the cracked oil and sediment of the bottom part of the said sedimentation tank as said additive to the said screw conveyor for input, The waste plastic oil-ized apparatus characterized by the above-mentioned . The waste plastic oil converting apparatus according to claim 1 ,
An opening / closing valve is provided between the charging screw conveyor and the dissolution evaporation tank,
A waste plastic oil converting apparatus, wherein a transfer screw conveyor for supplying the pulverized waste plastic to the input screw conveyor is connected to an intermediate portion of the input screw conveyor. The waste plastic oil-generating apparatus according to claim 1 or 2 , wherein the cracked oil generating apparatus is connected to the dissolution evaporating tank via a communication path extending upward from an upper end portion of the dissolution evaporating tank,
The waste plastic oiling apparatus, wherein the communication path includes a gas introduction portion extending upward from the dissolution evaporation tank to a position higher than the charging screw conveyor. In waste plastics Liquefaction apparatus according to any one of claims 1 to 3, the lower end of the melting evaporation vessel, and gradually the inner diameter becomes smaller tapered inclined wall toward the lower side, the A cylinder extending downward from the lower end of the inclined wall,
The lower end of the cylinder is connected to the lower residue recovery unit via a residue discharge on-off valve,
Inside the dissolution evaporating tank, a stirring unit that rotates around the vertical axis and stirs the waste plastic and the catalyst is provided,
The stirring unit includes a screw that constitutes a screw conveyor in the dissolution evaporation tank in cooperation with the cylinder,
The screw rotates so that the conveying direction of the screw conveyor in the melting and evaporating tank is upward during the operation of gasifying waste plastic, and is reverse to the operation when discharging the residue from the melting and evaporating tank. Waste plastic oil making apparatus characterized by rotating in the direction.

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