KR20220093649A - waste plastic pyrolyzing apparatus and fuel oil producing system using the same - Google Patents

Abstract

The present invention relates to a plastic vacuum pyrolysis apparatus that pyrolyzes waste plastic in a high-temperature and high-vacuum environment and a pyrolysis liquefaction system using the same, wherein the apparatus comprises: an input unit into which plastic is introduced; a melting furnace connected to the input unit and compressing and melting the plastic; a transfer unit equipped with a first transfer means for transferring the plastic in one direction; a pyrolysis furnace connected to the transfer unit and pyrolyzing the compressed and melted plastic; a discharge unit connected to the pyrolysis furnace and discharging pyrolyzed by-product; a combustion furnace generating combustion heat by combusting a fuel material; and a first and a second heating furnace receiving the combustion heat and heating the melting furnace and the pyrolysis furnace, respectively, wherein the transfer unit moves upward from the melting furnace toward the pyrolysis furnace. The present invention can effectively prevent degradation of a vacuum pump.

Description

Plastic vacuum pyrolyzing apparatus and pyrolysis emulsification system using same

The present invention relates to a plastic vacuum pyrolysis device for pyrolyzing waste plastic in a high temperature and high vacuum environment and a pyrolysis emulsification system using the same.

In recent years, as society is experiencing rapid industrialization and urbanization, the amount of various wastes is rapidly increasing, and the proportion of hard-to-decompose plastics such as vinyl, plastic, rubber, and waste fishing nets is showing a sharp increase worldwide.

For this reason, countries around the world are actively seeking an efficient treatment method for recalcitrant waste, while contaminants accompanying the treatment of recalcitrant waste, such as dioxin (Poly Chlorinated Dibenzo Dioxins, PCDD-based compounds. Hereinafter the same applies). We are focusing on reducing air polluting emissions such as

In the past, the methods of 'reduction', 'recycling', 'regeneration', 'landfill' and 'incineration' have been mainly used for waste treatment, but 'reduction', 'recycling' and 'regeneration' are excluded, which are not final treatment methods. 'Landfill' causes serious soil and water pollution over a long period of time, and 'incineration' entails a large amount of soot, dust, and air polluting emissions from incomplete combustion. In particular, plastic wastes such as vinyl, plastic, and rubber (hereinafter referred to as plastics) are a major cause of soil contamination during landfill and serious air pollution during incineration, so a new treatment method is urgently needed.

Accordingly, a method of pyrolyzing plastics in a high temperature and vacuum environment and condensing oil vapor generated during the pyrolysis process to obtain pyrolysis oil has been introduced.

For example, Korean Patent Laid-Open No. 2001-66928 discloses that pyrolysis oil is recovered by condensing oil vapor obtained during the process of dry distillation decomposition of plastics in a pyrolysis furnace, and pyrolysis oil is recovered from residual pyrolysis products in a vent condenser of an exhaust gas treatment process. Disclosed is a method and apparatus for decomposition and emulsification of recovered waste plastics. In addition, Korean Patent Laid-Open No. 2004-22642 discloses that the plastic is compressed with a cylinder means before being put into the pyrolysis furnace to remove air, thereby preventing self-combustion during indirect heating and recycling the residual pyrolysis product as a heat source for recycling waste plastic pyrolysis oil. The device is disclosed.

However, these general technologies show several problems. Looking at only two representative ones, first, the throughput per unit time is greatly insufficient because continuous processing of plastics is impossible, and secondly, it is difficult to maintain a vacuum state during pyrolysis of plastics, so the processing efficiency is low. In addition, it is often the case that the process does not proceed smoothly due to the adhesion of residues in the device due to self-combustion.

Looking at each, a typical plastic pyrolysis device selects the so-called batch type, in which continuous input of waste is impossible during the process due to the maintenance of a vacuum inside the pyrolysis furnace, etc. Therefore, it is possible to process only a certain amount of waste in one process, and it consumes time and money, and requires a large pyrolysis furnace to handle a large amount of waste, so it has a big device limitation such as a large installation area.

In addition, since most of the general plastic pyrolysis equipment removes air by compression 1 or 2 times before the plastic is injected, it is difficult to completely remove the air inside, and additional air removal is impossible during the pyrolysis process. Therefore, there is a high possibility that the self-combustion phenomenon due to residual air occurs during the pyrolysis process, resulting in a decrease in treatment efficiency, as well as residuals from self-combustion sticking in the device, which may interfere with the process progress or cause malfunction or failure of the pyrolysis device. It is often the case

Accordingly, the present inventor provides a plastic thermal decomposition device described in Korean Patent No. 1051314, comprising: an input unit equipped with a hopper for plastic input; a heating furnace equipped with a burner to create a high-temperature environment therein and to have a combustion gas outlet through which the combustion gas of the burner is discharged; One end is connected to the input part, and a transfer compression means is installed that passes through the heating furnace so that one end and the other end are exposed to the outside, and transports and compresses the plastic in one direction along the inner longitudinal direction. A melting furnace equipped with a steam outlet for discharging water vapor according to compression and melting of waste plastics; a first transfer unit connected to the other end of the melting furnace to transfer the melt of plastic; One end is connected to the first transfer unit, and the one end and the other end pass through the heating furnace so that the other end is exposed to the outside. pyrolysis furnace for transport and pyrolysis; a second transfer unit connected to the other end of the pyrolysis furnace to transfer pyrolysis residues of plastic; While providing a vacuum pyrolysis device including a discharge part for discharging pyrolysis residues having one end connected to the second transfer part, the vacuum pyrolysis device; a 2-1 condenser connected to the oil vapor outlet of the pyrolysis furnace to obtain pyrolysis oil by first condensing oil vapor generated during the pyrolysis process; A pyrolysis emulsification system including one or more 2-2 condensers connected to the 2-1 condenser via a vacuum pump to obtain pyrolysis oil by secondary condensing oil vapor has been provided.

However, the vacuum pyrolysis apparatus and the pyrolysis emulsification system using the same according to Korean Patent Registration No. 1051314 also showed some disadvantages in use.

First, in the case of the vacuum pyrolysis device, the melt was not smoothly transferred due to foreign substances inside the melt.

That is, the plastic injected into the hopper is properly crushed after stones, metals, wood, etc. are removed, but foreign substances still remain, and even when the plastic is melted at a high temperature through a melting furnace and/or pyrolysis furnace, the foreign substances are solid in the melt continue to remain as As a result, unnecessary pinching or sticking by foreign substances occurred during the transfer of the melt, and eventually, it was found that the stable transfer of the melt was prevented, causing a bottleneck, or even breaking the vacuum inside the vacuum pyrolysis device.

And in the case of the pyrolysis emulsification system, the high-temperature oil vapor was directly introduced into the vacuum pump, and the vacuum pump was severely damaged.

That is, in the pyrolysis and emulsification system of Patent Registration No. 1051314, the 2-1 condenser was installed between the oil vapor outlet and the vacuum pump to prevent high-temperature oil vapor from directly flowing into the vacuum pump, but the 2-1 condenser was not sufficiently cooled. There were still cases in which unsatisfactory oil vapor was introduced into the vacuum pump, which resulted in deterioration of the performance of the vacuum pump or even failure.

1. Republic of Korea Patent Publication No. 2001-66928 2. Korean Patent Publication No. 2004-22642 3. Republic of Korea Patent Publication No. 1051314

The present invention is to solve the above problems. That is, the present invention is a plastic vacuum pyrolysis device for thermally decomposing plastics in a high-temperature and high-vacuum environment and a pyrolysis and emulsification system using the same. The purpose of the present invention is to present a specific and realistic method that can effectively prevent the deterioration of the vacuum pump due to direct suction.

The present invention, in order to achieve the above object, a plastic input unit; a melting furnace connected to the input and compressing and melting the plastic; a transfer unit provided with a first transfer means for transferring the plastic in one direction; a pyrolysis furnace connected to the conveying part and pyrolyzing the compressed and melted plastic; a discharge unit connected to the pyrolysis furnace and discharging pyrolyzed by-products; a combustion furnace that burns a fuel material to generate combustion heat; It includes first and second heating furnaces for heating the melting furnace and the pyrolysis furnace by receiving the heat of combustion, respectively, and the transfer unit provides a vacuum pyrolysis device for plastics that ascends from the melting furnace toward the pyrolysis furnace.

In addition, the present invention is a plastic pyrolysis and emulsification system using the vacuum pyrolysis device for plastics, the vacuum pyrolysis device; a first condenser connected to the melting furnace to condense water vapor according to compression and melting of the plastic; a second condenser connected to the pyrolysis furnace to condense oil vapor according to the thermal decomposition of the compressed and melted plastic; at least one third condenser each connected to the second condenser via the same number of first valves; a vacuum pump to which the at least one third condenser is connected to each other via the same number of second valves; It provides a plastic pyrolysis and emulsification system including a fourth condenser connected to the vacuum pump.

The plastic vacuum pyrolysis device and pyrolysis emulsification system according to the present invention effectively prevent deterioration of the vacuum pump due to direct suction of high-temperature oil vapor and the transfer unit that enables stable quantitative transfer of high-temperature melt while maintaining a high vacuum state despite foreign substances in the melt It shows the advantage of being able to completely thermally decompose plastics in high-temperature and high-vacuum environments through the vacuum holding part that can do it.

1 is a view showing a plastic vacuum pyrolysis device according to the present invention.
2 is a view showing a vacuum pyrolysis emulsification system according to the present invention.

Hereinafter, the present invention will be described in detail through preferred embodiments of the present invention.

Advantages and features disclosed below and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and this embodiment is only intended to complete the disclosure of the present disclosure and to provide common knowledge in the technical field to which the present disclosure belongs. The present disclosure is only defined by the scope of the claims since it is provided to fully inform those who have the scope of the invention.

Also, the terms used herein are used only to describe specific embodiments and are not intended to limit the present disclosure. For example, a component expressed in a singular should be understood as a concept including a plurality of components unless the context clearly means only the singular. In addition, in the specification of the present disclosure, terms such as 'comprise' or 'have' are only intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and such The use of the term does not exclude the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof. In addition, in the embodiments described in this specification, a 'module' or 'unit' may mean a functional part that performs at least one function or operation.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and shall be interpreted in an ideal or excessively formal meaning unless explicitly defined in the specification of the present disclosure. doesn't happen

1 is a schematic diagram showing a plastic vacuum pyrolysis device according to the present invention.

As can be seen, the vacuum pyrolysis device according to the present invention is connected to the input unit 10 into which the plastic is put, the melting furnace 50 connected to the input unit 10 to compress and melt the plastic, and the melting furnace 50 to compress and melt the plastic. A transfer unit 70 for transferring the plastic, a pyrolysis furnace 90 for pyrolyzing compressed and molten plastic in a vacuum environment connected to the transfer unit 70, a combustion furnace F for burning fuel materials to generate heat of combustion, combustion The furnace F includes first and second heating furnaces 30 and 40 for heating the melting furnace 50 and the pyrolysis furnace 90 with the heat of combustion, respectively.

Hereinafter, it will be looked at in turn.

First, the input unit 10 is a portion to which the plastic for thermal decomposition is supplied, and includes a hopper 12 into which the plastic is input.

For reference, the plastic may be in a state that has been subjected to at least once, preferably two or more crushing processes and impurity removal processes, during the process of being transported to the hopper 12 . In addition, the amount of plastic injected into the input unit 10 is limited to less than a certain amount per hour to prevent malfunction of the device due to excessive inflow of plastic.

As can be seen, the input unit 10 is a hopper 12 with an open upper surface, a connecting pipe (S1 to S4) connecting the hopper 12 and the melting furnace 50, and a connecting pipe (S1 to S4) for the plastic injected into the melting furnace. A first transport means (T1) for transporting to (50), and first and second compression means (16, 18) for compressing the plastic during the transport process of the plastic by the first transport means (T1).

Preferably, the hopper 12 is provided with an opening 13 that can open and close the entrance, and the connecting pipes S1 to S4 are a horizontal first connecting pipe S1 connected to the lower end of the hopper 12, the first A vertical second connector (S2) connected to the end of the connector (S1), a third horizontal connector (S3) connected to the end of the second connector (S2), and the third connector (S3) It includes a vertical fourth connecting pipe (S4) connecting the end and the melting furnace (50). And the first connecting pipe (S1) is installed through the screw conveyor as the first conveying means (T1), the second connecting pipe (S2) and the third connecting pipe (S3), respectively, the first and second compression means (16, 18), the compression piston is installed through and moves up and down along each longitudinal direction.

Unexplained reference numeral M1 denotes a first motor for driving the first transfer means T1.

As a result, the plastic injected into the hopper 12 is compressed and transported by the first transporting means T1 and the first and second compression means 16 and 18 and delivered to the melting furnace 50 .

Looking at the sequence, first, the second compression means 18 descends to seal the end of the third connection pipe S3. Then, when the plastic is put into the hopper 12, the first transfer means T1 transfers the plastic to the second and third connecting pipes S2 and S3, and when all the plastics are transferred to the third connecting pipe S3, the second The first compression means 16 moves forward in the direction of the second compression means 18 to compress the plastic therebetween, while sealing the end of the second connecting pipe S2. And when the compression by the first compression means 16 is completed, the second compression means 18 rises and connects the third and fourth connecting pipes S3 and S4 by opening the end of the third section S3 and , the first compression means 16 further advances to deliver the compressed plastic to the fourth connecting pipe S4. After that, the second compression means 18 finally descends to deliver the compressed plastic to the melting furnace 50 and at the same time to seal the end of the third connection pipe S3 again, and the first compression means 16 returns to its original position. Thus, as the second and third connecting pipes S2 and S3 are connected, it returns to the initial state.

At this time, while the plastic is compressed by the first compression means 16, the second connection pipe S2 is sealed, and the plastic compressed by the second compression means 18 is delivered to the melting furnace 50 at the same time as the third The connecting pipe S3 is closed again. Therefore, the first and second compression means 16 and 18 repeat the above operation while compressing a certain amount of plastic to deliver it to the melting furnace 50, and block unnecessary external air from flowing into the melting furnace 50 during this process. It is possible to maintain a vacuum in the system.

Next, the melting furnace 50 is a part that compresses and melts the plastic delivered from the input unit 10 and delivers it to the transfer unit 70 .

The melting furnace 50 for this purpose is a horizontal cylinder or similar tank shape passing through the first heating furnace 30 to be described later, and one end and the other end are connected to the input unit 10 and the first transfer unit 70, respectively, and , a screw conveyor is installed as a second transport means (T2) for unidirectional transport and compression of the plastic along the inner longitudinal direction to transport and compress the plastic delivered from the input unit 10 in the transport unit 70 direction. At this time, the screw conveyor of the second conveying means (T2) can increase the conveying and compression efficiency toward the conveying unit 70 because the pitch interval becomes narrower toward the conveying unit (70).

Unexplained reference numeral M2 denotes a second motor for driving the second transfer means T2.

Therefore, the plastic delivered to the melting furnace 50 through the input unit 10 is melted by the high temperature of the first heating furnace 30 during the process of being conveyed and compressed by the second conveying means T2 and transferred in the form of a melt. (70).

Next, the transfer unit 70 delivers the melt compressed and melted in the melting furnace 50 to the pyrolysis furnace 90 .

The transfer unit 70 for this purpose has a cylindrical or tank shape connecting the melting furnace 50 and the pyrolysis furnace 90, and a screw conveyor as a third transfer means (T3) for one-way transfer of plastics along the inner longitudinal direction. is installed And in particular, the transfer unit 70 is inclined upwardly from the melting furnace 50 toward the pyrolysis furnace 90 in order to prevent the vacuum environment of the pyrolysis furnace 90 from being unnecessarily damaged in the process of transferring the melt, and the melting furnace 50 ) The first and second gates G1 and G2 for opening and closing the transfer unit 70 are installed at one end of the transfer unit 70 on the side and the other end of the transfer unit 70 on the pyrolysis furnace 90 side.

For reference, although a motor for driving the third transfer means T3 is not shown, it may be the same screw conveyor as the first and second transfer means before the third.

That is, in the vacuum pyrolysis apparatus according to the present invention, the melting furnace 50 is disposed at the lower end of the input unit 10 , and the pyrolysis furnace 90 is disposed on one side of the melting furnace 50 . At this time, preferably, the pyrolysis furnaces 90a and 90b may be divided into first and second pyrolysis furnaces 90a and 90b parallel to top and bottom, and the first pyrolysis furnace 90a at the top is disposed on one side of the melting furnace 50 . And the transfer unit 70 is inclined upward from the lower end of one side of the melting furnace 50 and is connected to the upper end of one side of the first pyrolysis furnace 90a, and one end of the transfer unit 70 on the side of the melting furnace 50 and the first pyrolysis furnace ( First and second gates G1 and G2 for opening and closing the transfer unit 70, respectively, are installed at the ends of the transfer unit 70 on the side of 90a).

Therefore, when the melt of the melting furnace 50 is piled up in front of the first gate G1 in a closed state and a predetermined pressure is applied, the first gate G1 is opened and the melt is transferred to the transfer unit 70, and the second of the transfer unit 70 3 The transport means (T3) is to transport the melt from the bottom up against the direction of gravity, in this process, the melt is naturally compressed by being pressed in the direction of gravity. And when the melt is accumulated at the end of the transfer unit 70 and a pressure of more than a certain level is applied, the second gate G2 is opened and the melt is transferred to the first pyrolysis furnace 90a.

As a result, the melt compressed by gravity in the transport process of the transfer unit 70 completely blocks between the melting furnace 50, which is relatively easy to be exposed to atmospheric pressure, and the first pyrolysis 90a where a high vacuum environment is created, and the first pyrolysis furnace It effectively prevents the high vacuum environment of (90a) from being damaged.

Next, the pyrolysis furnaces 90a and 90b pyrolyze the melt transferred from the transfer unit 70 , and the final sludge that is not finally decomposed is transferred to the discharge unit 130 .

For this purpose, the pyrolysis furnace 90 is a horizontal cylinder or similar tank shape with one end connected to the transfer unit 70 and the second heating furnace 40 so that one end and the other end are exposed to the outside of the second heating furnace 40 . goes through In addition, along the inner longitudinal direction of the pyrolysis furnace 90, fourth transport means (T4-1, T4-2) for transporting the plastic in one direction are installed.

In this case, the pyrolysis furnaces 90a and 90b may connect two or more horizontal cylindrical tanks in a zigzag or similar form to increase pyrolysis efficiency. That is, as shown in the drawing, the pyrolysis furnaces 90a and 90b are a first pyrolysis furnace 90a at the upper end connected to the first transfer unit 70, and a first pyrolysis furnace 90a at the lower end of the first pyrolysis furnace 90a. and a second pyrolysis furnace 90b connected to -2) is installed so that the melt transferred from the transfer unit 70 is transferred to the discharge unit 130 sequentially via the first and second pyrolysis furnaces 90a and 90b by taking opposite transfer directions. In addition, the second heating furnaces 40a and 40b may include 2-1 and 2-1 heating furnaces 40a and 40b for heating the first and second pyrolysis furnaces 90a and 90b, respectively.

Unexplained reference numerals M4-1 and M4-2 denote 4-1 and 4-2 motors for driving the 4-1 and 4-2 transfer means T4-1 and T4-2, respectively.

As a result, the melt transferred to the pyrolysis furnace 90 through the transfer unit 70 moves along the first and second pyrolysis furnaces 90a and 90b at the high temperature of the 2-1 and 2-2 heating furnaces 40a and 40b. is thermally decomposed by

Next, the discharge unit 130 is connected to the other end of the second pyrolysis furnace (90b).

The discharge unit 130 has a cylindrical tank or similar shape in which one end is connected to the second pyrolysis furnace 90b and the other end is closed with an openable and openable cap 136 .

In this case, preferably, a third gate G3 for opening and closing the discharge unit 130 may be included at the distal end of the discharge unit 130 . Therefore, when a predetermined amount of pyrolysis by-products are collected at the end of the discharge unit 130 in a state in which the third gate G2 is closed, the third gate G3 is opened and discharged to the outside.

As a result, the plastic injected into the hopper 12 of the input unit 10 is transferred to the melting furnace 50, the plastic is compressed and melted at a high temperature in the melting furnace 50, and the melt is transferred to the pyrolysis furnace 90 through the transfer unit 70 ), and in the pyrolysis furnace 90 , the melt is pyrolyzed by high temperature and high vacuum, and the final by-product is discharged to the outside through the discharge unit 130 .

On the other hand, the plastic vacuum pyrolysis apparatus according to the present invention includes a combustion furnace F and first and second heating furnaces 30 and 40 as a combustion system for high temperature of the melting furnace 50 and the pyrolysis furnace 90 .

As can be seen, the combustion system of the plastic vacuum pyrolysis device according to the present invention is a combustion furnace (F) equipped with a burner (B) for generating combustion heat by burning fuel materials such as oil in the fuel tank (36), a combustion furnace (F) ) of the 2-1 and 2-2 heating furnaces 40a and 40b for heating the first and second pyrolysis furnaces 90a and 90b, respectively, and the melting furnace exhausted from the first and second pyrolysis furnaces 90a and 90b. It includes a first heating furnace (30) for heating (50).

And preferably, the combustion heat of the combustion furnace F is transmitted to the 2-1 and 2-2 heating furnaces 40a and 40b through the blower P, and the 2-1 and 2-2 heating furnaces 40a, The residual heat in 40b) is transferred to the first heating furnace 30, and the final residual heat passing through the first heating furnace 30 is collected again to the combustion furnace F to support the thermal power of the burner, thereby reducing fuel consumption. effect can be achieved.

For reference, D1, D2, and D3 are dampers for mixing an appropriate amount of external air with the combustion heat transmitted to the 2-1 and 2-2 heating furnaces 40a and 40b and the first heating furnace 30, respectively, Vd denotes a drain valve for draining the hot air in the 2-1 and 2-2 heating furnaces 40a and 40b and the combustion furnace F, respectively.

On the other hand, the vacuum pyrolysis device described above enables continuous supply and thermal decomposition of plastics, and enables thermal decomposition in a high vacuum environment while removing substantially the entire amount of air or moisture contained in the plastic. The present invention further provides a pyrolysis emulsification system capable of obtaining a larger amount of pyrolysis oil per unit time by using the vacuum pyrolysis device described above.

2 is a structural diagram showing a pyrolysis emulsification system according to the present invention. For reference, in this drawing, the vacuum pyrolysis apparatus is briefly shown mainly for the necessary parts, and unnecessary reference numerals are omitted in the description.

A considerable amount of water vapor is generated during compression and melting of plastics by the melting furnace 50, and a significant amount of oil vapor is generated.

Therefore, the pyrolysis emulsification system according to the present invention is connected to the first condenser 152 and the water purifier 154, the pyrolysis furnace 90, in particular the first pyrolysis furnace 90a, which are sequentially connected to the melting furnace 50. and a second condenser 164 , at least one third condenser 182 , 184 , 186 , a vacuum pump 180 , and a fourth condenser 168 . For reference, the detailed configuration of the condenser, the vacuum pump, etc. can be applied to general contents, so instead of omitting the detailed description, we will focus on the respective roles.

A first condenser 152 is connected to the melting furnace 50 to condense water vapor generated during the plastic compression and melting process into liquid water, and a crystallizer 154 is connected to the first condenser 152 to condense the condensed water. to purify And preferably, the unnecessary gas component that has passed through the first condenser 152 and the crystallizer 154 is cooled through the cooler 172 and then supplied to the fuel supply device 36 and recycled as fuel for the burner B. . For reference, reference numeral 174 denotes a coolant storage tank 174 that stores coolant supplied to the cooler 172 .

A second condenser 164 , at least one third condenser 182 , 184 , 186 , a vacuum pump 180 , and a fourth condenser 168 are connected to the pyrolysis furnace 90 . The second condenser 164 , at least one third condenser 182 , 184 , 186 , the vacuum pump 180 , and the fourth condenser 168 are collectively referred to as a vacuum holding unit.

At this time, preferably, the third condenser (182, 184, 186) is two or more, preferably three, each connected to the second condenser 164 via the first to third valves (V1, V2, V3). These third condensers (182, 184, 186) are respectively connected to the vacuum pump 180 via the fourth to sixth valves (V4, V5, V6). And preferably, the second condenser 164 and the fourth condenser 168 may be directly connected via the safety valve V, and the fourth condenser 168 is directly connected to the vacuum pump 180, and the second , 3 and 4 condensers (164, 182, 184, 186) are properly connected to the first and second pyrolysis oil tanks (165, 167).

At this time, the second, third, and fourth condensers 164, 182, 184, and 186 each inhale and condense the oil vapor discharged from the pyrolysis furnace 90 to properly maintain a vacuum degree inside the pyrolysis furnace 90, while condensing the inhaled oil vapor to condense the pyrolysis oil In particular, in the present invention, at least one third condenser (182,184,186) is connected between the second condenser 164 and the vacuum pump 180 so that the high-temperature oil vapor of the second condenser 164 is directly vacuum pump 180 ) to prevent damage to the vacuum pump 180, a vacuum is maintained inside the third condensers 182, 184, 186 by the vacuum pump 180, and is connected to the second condenser 164 sequentially or in a certain rule. After being condensed and cooled again by inhaling the oil vapor inside the second condenser 164 , it serves to transfer it to the fourth condenser 168 through the vacuum pump 180 .

More specifically, the first to sixth valves V1 to V6 are all opened and the vacuum pump 180 is driven before plastic is put into the melting furnace 50 and compression and melting proceed or while compression and melting are in progress. A vacuum is created inside the second to third condensers (164, 182, 184, 186) including the pyrolysis furnace (90). And when a desired degree of vacuum is created inside the pyrolysis furnace 90 and the second to third condensers 164, 182, 184, and 186, all of the first to sixth valves V1 to V6 are closed.

During this process, a melt is generated inside the melting furnace 50, and when the viscosity of the melt is below a certain level, it is introduced into the first pyrolysis furnace 90a by the first transfer unit 70, and inside the pyrolysis furnace 90, the melt is Thermal decomposition proceeds to generate oil vapor. And the oil vapor inside the pyrolysis furnace 90 is transferred to the second condenser 164 and condensed, and then the regenerated oil is transferred to the first and second pyrolysis oil tanks 165 and 167 .

Subsequently, when the internal pressure of the pyrolysis furnace 90 and the second condenser 164 is higher than the reference value, the first valve V1 is opened and the oil vapor inside the second condenser 164 is one of the third condensers 182,184,186, optionally the second 3-1 is quickly sucked into the condenser (182). As a result, the inside of the pyrolysis furnace 90 still maintains a vacuum below the standard value, and the oil vapor introduced into the second condenser 164 and the 3-1 condenser 182 is condensed, and then the regenerated oil is first and second pyrolyzed. It is transmitted to the oil tanks (165, 167).

Subsequently, when the degree of vacuum of the pyrolysis furnace 90, the second condenser 164, and the 3-1 condenser 182 are similar, the first valve V1 is closed and the second valve V2 is opened to open the second condenser 164 The oil vapor inside is immediately introduced into another one of the third condensers 182 , 184 , and 186 , optionally into the 3-2 condenser 184 . As a result, the inside of the pyrolysis furnace 90 still maintains a vacuum below the standard value, and the oil vapor introduced into the second condenser 164 and the 3-2 condenser 184 is condensed, and then the regenerated oil is first and second pyrolyzed. It is transmitted to the oil tanks (165, 167). And preferably, when the inside of the 3-1 condenser 182 is sufficiently cooled, the fourth valve V4 is opened and a vacuum is created inside the 3-1 condenser 182 by the vacuum pump 180, and the vacuum pump ( The oil vapor sucked in by 180 is transferred to the fourth condenser 168 .

Subsequently, when the degree of vacuum of the pyrolysis furnace 90, the second condenser 164, and the 3-2 condenser 184 become similar, the second valve V2 is closed and the third valve V3 is opened to open the second condenser 164 The oil vapor inside is instantly introduced into another one of the third condensers 182 , 184 , and 186 , optionally the 3-3 condenser 186 . As a result, the inside of the pyrolysis furnace 90 still maintains a vacuum below the reference value, and the oil vapor introduced into the second condenser 164 and the 3-3 condenser 186 is condensed, and then the regenerated oil is first and second pyrolyzed. It is transmitted to the oil tanks (165, 167). And preferably, when the inside of the 3-2 condenser 184 is sufficiently cooled, the fifth valve V5 is opened and a vacuum is created inside the 3-2 condenser 184, and the oil vapor sucked by the vacuum pump 180 is It is passed to the fourth condenser 168 .

On the other hand, the above process is sequentially repeated as many as the number of third condensers 182 , 184 , and 186 , and as a result, the pyrolysis furnace 90 proceeds with thermal decomposition while maintaining a vacuum below the reference value. And the oil vapor condensed during this process is condensed and produced as regenerated oil, and the vacuum pump 180 absorbs only the sufficiently condensed and cooled non-condensed gas, so there is no risk of damage. In addition, since the oil vapor condensed in the fourth condenser 168 is a gas component from which the regenerated oil has been substantially removed, it is stored in the gas storage tank 170 and then supplied to the fuel supply device 36 to be reused as fuel for the burner 34 .

At this time, preferably, a safety valve (Vs) for opening the corresponding pipe for a pressure exceeding the standard value may be installed in the pipe connecting the second condenser 164 and the fourth condenser 168, and the pyrolysis furnace 90 When abnormal pressure inside is detected, the safety valve (Vs) opens the corresponding pipe. As a result, the oil vapor inside the second condenser 164 is directly introduced into the fourth condenser 168 to quickly lower the internal pressure of the pyrolysis furnace 90 .

For reference, the unexplained reference numeral Vc denotes a check valve for preventing the reverse flow of oil vapor transferred from the melting furnace 50 and the pyrolysis furnace 90 to the first condenser 152 and the second condenser 164 , respectively.

The above description and drawings are merely illustrative of the present invention and do not limit the present invention. That is, the present invention is capable of various modifications, but if these modifications are within the technical spirit of the present invention, it will be said that they belong to the scope of the present invention, the scope of the present invention is to be interpreted as the following claims or equivalents There is a need.

10: input unit 30: first heating furnace
50: melting furnace 70: transfer unit
40a, 40b: No. 2-1, 2-2 heating furnace
90a, 90b: first and second pyrolysis furnaces
130: discharge part

Claims (7)

an input part into which the plastic is put;
a melting furnace connected to the input and compressing and melting the plastic;
a transfer unit provided with a first transfer means for transferring the plastic in one direction;
a pyrolysis furnace connected to the conveying part and pyrolyzing the compressed and melted plastic;
a discharge unit connected to the pyrolysis furnace and discharging pyrolyzed by-products;
a combustion furnace that burns a fuel material to generate combustion heat;
and first and second heating furnaces for heating the melting furnace and the pyrolysis furnace by receiving the combustion heat,
The transfer unit is a vacuum pyrolysis device for plastics upward toward the pyrolysis furnace from the melting furnace. The method of claim 1,
The vacuum pyrolysis apparatus for plastics further comprising first and second gates respectively provided at one end of the transfer unit on the side of the melting furnace and the other end of the transfer unit on the side of the pyrolysis furnace to open and close the transfer unit. The method of claim 1,
The input unit,
a hopper into which the plastic is put;
a horizontal first connector connected to the lower end of the hopper and provided with a second transfer means for transferring the plastic in one direction;
a second vertical connector connected to an end of the first connector;
a third horizontal connector connected to an end of the second connector;
a vertical fourth connector connecting the end of the third connector and the pyrolysis furnace;
a first compression means installed through the second connecting pipe and moving along the longitudinal direction of the second connecting pipe;
A vacuum pyrolysis apparatus for plastics including a second compression means installed through the third connecting pipe and moving along the longitudinal direction of the third connecting pipe. The method of claim 1,
A vacuum pyrolysis device for plastics further comprising three gates provided at the distal end of the discharge unit to open and close the discharge unit. The method of claim 1,
The first conveying means is a vacuum pyrolysis device for plastics which is a screw conveyor. 4. The method of claim 3,
The second conveying means is a vacuum pyrolysis device for plastics which is a screw conveyor. A pyrolysis and emulsification system for plastics using the vacuum pyrolysis device for plastics according to claim 1,
the vacuum pyrolysis device;
a first condenser connected to the melting furnace to condense water vapor according to compression and melting of the plastic;
a second condenser connected to the pyrolysis furnace to condense oil vapor according to pyrolysis of the compressed and melted plastic;
at least one third condenser each connected to the second condenser via the same number of first valves;
a vacuum pump to which the at least one third condenser is connected to each other via the same number of second valves;
A plastic pyrolysis and emulsification system including a fourth condenser connected to the vacuum pump.

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