KR20230116463A - Apparatus and method for recycling waste synthetic resin - Google Patents

Abstract

The present invention provides an apparatus and method for recycling waste synthetic resin capable of producing recycled oil (oil) from waste synthetic resin. The present invention is a pyrolysis furnace for generating oil vapor by thermally decomposing waste synthetic resin; a condenser condensing the oil vapor generated in the pyrolysis furnace to produce condensate; a main flow line installed between the pyrolysis furnace and the condenser and supplying oil vapor generated in the pyrolysis furnace to the condenser; an oil-water separator separating regenerated oil from the condensate produced in the condenser; a main valve installed on the main flow line; a sub-flow line connected to the main flow line and configured to separate and discharge the water-containing gas generated in the pyrolysis furnace at an early stage of pyrolysis of the waste synthetic resin; and a waste synthetic resin regeneration device including a sub valve installed on the sub flow line, and a waste synthetic resin regeneration method using the same. According to the present invention, water is separated and discharged at the initial stage of pyrolysis of waste synthetic resin, so that at least the oil-water separation process is improved and high-purity recycled oil can be separated and produced.

Description

Waste synthetic resin regeneration device and regeneration method {APPARATUS AND METHOD FOR RECYCLING WASTE SYNTHETIC RESIN}

The present invention relates to a regeneration device and a method for regenerating waste synthetic resin capable of producing reclaimed oil (oil) from waste synthetic resin. At least, it relates to an apparatus and method for regenerating waste synthetic resin capable of improving an oil-water separation process and separating and producing high-purity reclaimed oil.

Landfill or incineration of waste synthetic resin causes at least environmental problems. When waste synthetic resin is landfilled, most of it does not decompose and pollutes the soil. In addition, when waste synthetic resin is incinerated, for example, SO _x , NO _x , chlorine gas and dioxin are generated to pollute the atmosphere.

Accordingly, various technologies for recycling waste synthetic resin have been proposed. A typical example is a chemical recycling technology using a thermal cracking process. Chemical recycling technology is a recycling technology that produces recycled oil (oil) from waste synthetic resin, which is a technology that thermally decomposes waste synthetic resin to generate oil vapor, and then condenses (cools) the generated oil vapor to convert it into recycled oil. At this time, the recycled oil may be recycled as fuel oil or the like. Chemical recycling technology uses a regeneration device (or emulsification device) including a pyrolysis furnace (or pyrolysis reaction furnace), and such a regeneration device is also suggested in several prior patents.

In this regard, Korean Patent Registration No. 10-2029047 proposes a low-temperature pyrolysis oil production apparatus having a wax reprocessing apparatus, and Korean Patent Publication No. 10-2010-0100366 proposes a waste synthetic resin emulsification apparatus, Korean Patent Publication No. 10-2020-0092064 proposes an efficient regeneration device for waste synthetic resin in pyrolysis oil. In addition, Japanese Patent Publication JP 2007-246685 discloses a waste emulsification method, Japanese Patent Publication JP 2010-222547 discloses a polymer waste emulsification treatment plant, and Japanese Patent Publication JP 2010-505021 discloses An apparatus for thermal decomposition and emulsification of plastic waste and a method thereof are presented.

1 is a block diagram showing an apparatus for regenerating waste synthetic resin according to the prior art. Referring to FIG. 1, in general, an apparatus for regenerating waste synthetic resin includes a pyrolysis furnace 1 for generating oil vapor by thermally decomposing waste synthetic resin, and condensing (cooling) the oil vapor generated in the pyrolysis furnace 1 to produce condensate (regeneration). A condenser (2) for producing oil and moisture), an oil-water separator (3) for separating reclaimed oil from the condensate produced in the condenser (2), and refining the reclaimed oil separated in the oil-water separator (3) (or rectifying) a purifier (4). In addition, the non-condensable gas that is not condensed in the condenser 2 is usually burned in the waste gas treatment furnace 5. In addition, the sludge (as solid carbon, commonly referred to as "CHAR") remaining in the pyrolysis furnace 1 is discharged and treated as waste.

However, the waste synthetic resin regeneration apparatus and regeneration method using the same according to the prior art have problems in that, for example, it is difficult to remove water in an oil-water separation process and the purity of the regenerated oil is low. In general, waste synthetic resin contains a large amount of moisture (about 10 to 15% by weight). Even if it is dried in advance before charging into the pyrolysis furnace 1, the waste synthetic resin contains moisture. Accordingly, in the process of raising the temperature at the beginning of operation of the pyrolysis furnace 1 (about 100 ° C), moisture is first evaporated and supplied to the condenser 2 to be condensed, and then the condensate is mixed with the regenerated oil generated by the condensation of the oil vapor to form oily water. is fed to the separator (3). Although recycled oil and water (condensate) are separated through the oil-water separator 3, it is very difficult to completely separate and remove the water because the oil-water separator 3 has a large amount of water. In addition, the recycled oil separated and recovered in the oil-water separator 3 contains at least the above moisture and has low purity.

Korean Patent Registration No. 10-2029047 (2019.10.07. Registration notice) Korean Patent Publication No. 10-2010-0100366 (published on September 15, 2010) Korean Patent Publication No. 10-2020-0092064 (2020.08.03. Publication) Japanese Patent Laid-Open No. JP 2007-246685 (published on September 27, 2007) Japanese Patent Laid-Open No. JP 2010-222547 (published on October 7, 2010) Japanese Unexamined Patent Publication No. JP 2010-505021 (published on February 18, 2010)

An object of the present invention is to provide an improved waste synthetic resin regeneration device and method.

According to one embodiment, the present invention includes a water separation process performed at an appropriate temperature at the beginning of the pyrolysis process, and an apparatus for regenerating waste synthetic resin capable of improving at least an oil-water separation process and separating and producing high-purity reclaimed oil, and The purpose is to provide a reproduction method.

In order to achieve the above object, the present invention,

A thermal decomposition furnace for generating oil vapor by thermally decomposing waste synthetic resin;

a condenser condensing the oil vapor generated in the pyrolysis furnace to produce condensate;

a main flow line installed between the pyrolysis furnace and the condenser and supplying oil vapor generated in the pyrolysis furnace to the condenser;

an oil-water separator separating regenerated oil from the condensate produced in the condenser;

a main valve installed on the main flow line;

a sub-flow line connected to the main flow line and configured to separate and discharge the water-containing gas generated in the pyrolysis furnace at an early stage of pyrolysis of the waste synthetic resin; and

An apparatus for regenerating waste synthetic resin including a sub-valve installed on the sub-flow line is provided.

According to an embodiment, the waste synthetic resin recycling apparatus according to the present invention further includes a sub-condenser connected to the sub-flow line, and the sub-condenser condenses the water-containing gas discharged through the sub-flow line. In this case, the moisture-containing gas discharged through the auxiliary flow line may include moisture and chlorine.

In addition, the present invention,

A pyrolysis process of generating oil vapor by pyrolyzing waste synthetic resin in a pyrolysis furnace;

a condensation step of condensing the oil vapor generated in the pyrolysis step in a condenser to produce condensate; and

An oil-water separation step of supplying the condensate generated in the condensation step to an oil-water separator to separate reclaimed oil from the condensate;

The pyrolysis process,

A water separation step of separating and discharging a water-containing gas generated at an early stage of pyrolysis;

After separating and discharging the water-containing gas, there is provided a method for regenerating waste synthetic resin comprising an oil vapor supply step of supplying oil vapor generated by thermal decomposition to a condenser.

In addition, the present invention

As a method for regenerating waste synthetic resin using the apparatus for regenerating waste synthetic resin of the present invention,

A pyrolysis process of generating oil vapor by pyrolyzing waste synthetic resin in a pyrolysis furnace;

a condensation step of condensing the oil vapor generated in the pyrolysis step in a condenser to produce condensate; and

An oil-water separation step of supplying the condensate generated in the condensation step to an oil-water separator to separate reclaimed oil from the condensate,

The pyrolysis process,

A water separation process of closing the main valve and opening the sub valve until the temperature in the pyrolysis furnace reaches 100 ° C. to 120 ° C. to separate and discharge the water-containing gas generated at the beginning of the pyrolysis through a sub flow line;

When the temperature in the pyrolysis furnace exceeds 100 ° C. to 120 ° C., the main valve is opened and the sub valve is closed to supply oil vapor generated by pyrolysis to the condenser through the main flow line. Provides a way to play.

The present invention provides an improved recycling apparatus and method for recycling waste synthetic resin into useful resources. According to the present invention, at least the oil-water separation process, including the water separation process, is improved, and high-purity recycled oil can be separated and produced.

1 is a block diagram showing an apparatus for regenerating waste synthetic resin according to the prior art.
2 is a block diagram showing an apparatus for regenerating waste synthetic resin according to an embodiment of the present invention.

The present invention provides a recycling device (or emulsification device) for waste synthetic resin capable of separating and producing recycled oil (oil) from waste synthetic resin. In addition, the present invention provides a recycling method (or emulsification method) of waste synthetic resin capable of separating and producing recycled oil (oil) from waste synthetic resin. The waste synthetic resin regeneration method according to the present invention can be implemented using, for example, the waste synthetic resin regeneration apparatus according to the present invention. Recycled oil produced by the present invention can be recycled as, for example, fuel oil.

Hereinafter, the present invention will be described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate exemplary embodiments of the present invention, which are provided merely to facilitate an understanding of the present invention. In the description of the present invention, detailed descriptions of known general-purpose functions and/or configurations are omitted. The term "and/or" used in the present invention is used to mean including at least one or more of the elements listed before and after.

2 is a block diagram showing an apparatus for regenerating waste synthetic resin according to an embodiment of the present invention.

Referring to FIG. 2 , an apparatus for regenerating waste synthetic resin according to the present invention (hereinafter, abbreviated as “regeneration apparatus” in some cases) includes a pyrolysis furnace 10 for generating oil vapor by thermally decomposing waste synthetic resin; a condenser 20 condensing the oil vapor generated in the pyrolysis furnace 10 to produce condensate; It includes an oil-water separator 30 for separating regeneration oil from the condensate produced in the condenser 20. At this time, a main flow line L1 is installed between the pyrolysis furnace 10 and the condenser 20 to supply oil vapor generated in the pyrolysis furnace 10 to the condenser 20, and the main flow line L1 The main valve V1 is installed on the top. In addition, a sub-flow line (L2) for separating and discharging a water-containing gas generated at an early stage of pyrolysis of waste synthetic resin is connected to the main flow line (L1), and a sub-valve (V2) is provided on the sub-flow line (L2). It is installed.

The regeneration apparatus according to the present invention may further include a sub condenser 22 connected to the sub flow line L2 according to an embodiment of the present invention. In addition, the regeneration apparatus according to the present invention includes a refiner 40 that purifies (or rectifies) the reclaimed oil separated in the oil-water separator 30; a waste gas storage/treatment tank 50 for storing or treating non-condensable gas not condensed in the condenser 20; a wastewater storage/treatment tank 60 for storing or treating the water separated by the oil-water separator 30; and/or a waste storage/treatment tank 70 for storing or treating sludge (such as CHAR as solid carbon) discharged from the pyrolysis furnace 10.

A method for regenerating waste synthetic resin according to the present invention (hereinafter, abbreviated as "regeneration method" in some cases) includes a thermal decomposition step of generating oil vapor by thermally decomposing waste synthetic resin in a pyrolysis furnace 10; a condensation step of condensing the oil vapor generated in the pyrolysis step in a condenser 20 to produce condensate; An oil-water separation step of supplying the condensate generated in the condensation step to the oil-water separator 30 to separate regenerated oil from the condensate. At this time, the thermal decomposition process includes a water separation process for separating and discharging the water-containing gas generated at the beginning of the pyrolysis, and an oil vapor supplying process for supplying oil vapor generated by pyrolysis to the condenser 20 after separating and discharging the water-containing gas. includes

In addition, the regeneration method according to the present invention may include a water condensation step of condensing the water-containing gas separated in the water separation step according to an embodiment of the present invention; a refining step of refining (or rectifying) the reclaimed oil separated in the oil-water separation step; and/or a sludge discharge process for discharging sludge (such as CHAR as solid carbon) remaining in the pyrolysis furnace 10 after the pyrolysis process is performed. Hereinafter, the waste synthetic resin regeneration method according to an embodiment of the present invention will be described together with the waste synthetic resin regeneration method according to an embodiment of the present invention while explaining each process.

[1] Pyrolysis process

The waste synthetic resin is charged (injected) into the pyrolysis furnace 10 to be thermally decomposed. In the present invention, the waste synthetic resin is not particularly limited, and it may be selected from waste generated at industrial sites or households. The waste synthetic resin is, for example, vinyl, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyacrylic (PA), polyurethane (PU), etc. and/or polycarbonate (PC)-based, and the like.

The waste synthetic resin may be washed and/or dried before being charged into the pyrolysis furnace 10. The waste synthetic resin may be charged into the thermal decomposition furnace 10 after drying by, for example, natural drying or thermal drying, and sufficiently removing moisture. The waste synthetic resin may be crushed and/or pulverized into a predetermined size and charged into the pyrolysis furnace 10 in the form of particles. In addition, the waste synthetic resin may be charged into the pyrolysis furnace 10 through a sorting/sorting operation, for example, using one of the resins listed above or mixing two or more of them.

The thermal decomposition furnace 10 is not particularly limited as long as it can generate oil vapor by thermally decomposing waste synthetic resin. As the thermal decomposition furnace 10, for example, a commonly used one may be used. The oil vapor generated in the pyrolysis furnace 10 is supplied to the condenser 20. A main flow line L1 is installed between the pyrolysis furnace 10 and the condenser 20 . The main flow line L1 connects the pyrolysis furnace 10 and the condenser 20 to provide a flow path capable of supplying oil vapor generated in the pyrolysis furnace 20 to the condenser 30 . In addition, a sub flow line L2 is connected to the main flow line L1. The sub flow line L2 may be connected to the main flow line L1 in a branched form. The sub-flow line L2 provides a flow path through which the gas containing moisture generated in the pyrolysis furnace 10 can be separated and discharged during pyrolysis of waste synthetic resin (in the beginning of pyrolysis). At this time, a main valve V1 is installed on the main flow line L1, and a sub valve V2 is installed on the sub flow line L2. The main valve V1 and the sub valve V2 are not particularly limited as long as they can be opened and closed.

The pyrolysis process proceeds by charging the waste synthetic resin into the pyrolysis furnace 10, blocking the inflow of oxygen, and heating (raising the temperature). Conditions such as temperature and pressure of the pyrolysis process may proceed under normal conditions. The pyrolysis process may proceed with a low-temperature pyrolysis process in which the temperature in the pyrolysis furnace 10 is raised to, for example, 350° C. to 450° C., more specifically, to about 400° C. In addition, the pyrolysis process may be performed at a pressure of 3 to 7 atmospheres (atm), for example, for 2 to 24 hours.

According to the present invention, the pyrolysis process includes a water separation process for separating and discharging the water-containing gas generated at the beginning of pyrolysis, and a steam supply process for supplying oil vapor generated by substantial pyrolysis of waste synthetic resin to the condenser 20 . That is, at the beginning of the pyrolysis process, the water separation process is performed, and then, at an appropriate time point, the process is switched to the steam supply process. The criterion (time point) for switching from the water separation process to the oil vapor supply process is the temperature in the pyrolysis furnace 10, which may be, for example, 100 ° C to 120 ° C.

In the present invention, the "initial stage of thermal decomposition (or initial stage of thermal decomposition)" is the time point from the start of heating (temperature elevation) until the temperature in the thermal decomposition furnace 10 reaches within the range of 100 ° C. to 120 ° C., which is water separation It is the point of time (standard) to switch from the process to the steam supply process. At this time, when the temperature at the time of conversion is less than 100 ° C., the amount of steam generated is low, and the efficiency of water separation is reduced. Considering this point, the temperature at the time of conversion may be 100 ° C to 110 ° C, or 100 ° C to 105 ° C, for example, about 105 ° C.

According to one embodiment, in the pyrolysis process, the temperature of the pyrolysis furnace 10 is raised until the temperature in the pyrolysis furnace 10 reaches 100 ° C to 120 ° C (for example, about 105 ° C). initial), and then, at a temperature higher than 100 ° C. to 120 ° C. (eg, about 105 ° C.), an oil vapor supply process of supplying oil vapor generated by substantial thermal decomposition of waste synthetic resin to the condenser 20 is performed. At this time, the steam supply process is a temperature range from a temperature higher than 100 ° C. to 120 ° C. (eg, about 105 ° C.) to the final temperature rise temperature (eg, 350 ° C. to 450 ° C., for example, about 400 ° C.) can proceed for an appropriate amount of time. Referring to FIG. 2 , while the water separation process is in progress, that is, until the temperature in the pyrolysis furnace 10 reaches 100° C. to 120° C. (eg, about 105° C.), the main valve V1 is closed. and the sub valve V2 is opened to separate and discharge the water-containing gas generated at the beginning of the pyrolysis through the sub flow line L2. In addition, while the oil vapor supply process is in progress, that is, when the temperature in the pyrolysis furnace 10 exceeds 100 ° C to 120 ° C (for example, about 105 ° C), the main valve V1 is opened and the sub valve V2 is closed, and oil vapor generated by substantial thermal decomposition of the waste synthetic resin is supplied to the condenser 20 through the main flow line L1.

According to a specific embodiment, the water separation process may be performed at a temperature in the pyrolysis furnace 10 in a range of about 90 ° C to 105 ° C, and the oil vapor supply process may be performed at a temperature in the pyrolysis furnace 10 greater than about 105 ° C. That is, the thermal decomposition is performed by raising the temperature of the thermal decomposition furnace 10, but the water-containing gas is separated and discharged at a temperature of about 90 ° C to 105 ° C in the thermal decomposition furnace 10, and then the temperature in the thermal decomposition furnace 10 is about 105 In the temperature range exceeding °C, oil vapor generated by substantial thermal decomposition of the waste synthetic resin may be supplied to the condenser 20.

In addition, in the water separation process, water as well as chlorine may be separated and discharged. That is, the water-containing gas separated and discharged through the sub-flow line L2 may include water and chlorine. The chlorine generally refers to Cl-containing compounds, which may include, for example, Cl ₂ , HCl, and/or Cl-containing hydrocarbons.

In addition, the oil vapor supplied to the condenser 20 may have a water content of 2% by weight or less. Specifically, most of the oil vapor supplied to the condenser 20 through the main flow line L1 is removed by the water separation process, and may be contained as a small amount of moisture at a maximum of 2% by weight. According to the experimental consideration of the present invention, when the water separation process is performed until the temperature reaches about 105 ° C in the initial stage of pyrolysis, it is found that the oil vapor supplied to the condenser 20 contains a small amount of moisture at about 2% by weight. there was.

The pyrolysis process, for example, may proceed as follows.

First, finely pulverized waste vinyl waste is charged into the pyrolysis furnace 10, oxygen inflow is blocked (the pyrolysis furnace is sealed), and the temperature is raised by operating the pyrolysis furnace 10. The main valve V1 is closed and the sub valve V2 is opened until the temperature in the pyrolysis furnace 10 reaches about 105°C. At this time, in the process of reaching 105 ° C. from about 90 ° C. (in the beginning of pyrolysis), water-containing gas including water vapor and chlorine gas is generated, which is separated and discharged through the sub-flow line L2. When the temperature in the pyrolysis furnace 10 exceeds about 105° C., the main valve V1 opens and the sub valve V2 closes. At this time, the oil vapor generated by the pyrolysis temperature of about 105 ° C. or higher is supplied to the condenser 20 along the main flow line L1. For example, when the temperature of the pyrolysis furnace 10 is raised to about 400 ° C, the oil vapor generated in the temperature range of 105 ° C to 400 ° C is supplied to the condenser 20 along the main flow line L1. .

As mentioned above, the waste synthetic resin charged into the pyrolysis furnace 10 contains moisture even if it has been previously dried. This moisture is not completely removed by the oil-water separator 30, lowering the purity of the reclaimed oil. Therefore, the present invention separates and discharges moisture in advance at the beginning of the pyrolysis process, and then supplies oil vapor containing a small amount of moisture (eg, moisture content of 2% by weight or less) to the condenser 20. It is meaningful.

According to the pyrolysis process of the present invention as described above, the condensate supplied to the oil-water separator 30 through the condenser 20 has a very low moisture content, so the oil-water separation process is improved and has high purity. That is, since the condensate supplied to the oil-water separator 30 contains a small amount of water, the recycled oil and water can be easily separated in the oil-water separator 30, and the water removal efficiency is improved. In addition, according to the present invention, in the pyrolysis process (water separation process), water as well as chlorine is separated and removed, so that high-purity recycled oil can be efficiently produced.

[2] Condensation process

An oil vapor condensation process of supplying the oil vapor generated in the pyrolysis furnace 10 to the condenser 20 and condensing (cooling) it through the condenser 20 is performed. The condenser 20 is not particularly limited as long as it can condense (cool) the oil vapor introduced along the main flow line L1 to produce liquid condensate, which can be used, for example, commonly used. . The condensate produced in the condenser 20 contains recycled oil and a small amount of moisture, and is supplied to the oil-water separator 30. In addition, non-condensed gas that is not condensed in the condenser 20 is separated separately, which follows a normal separation process. The non-condensable gas may be supplied to the waste gas storage/treatment tank 50 to be stored or treated.

Meanwhile, a water condensation process of supplying the water-containing gas discharged through the sub flow line L2 to the sub condenser 22 and condensing (cooling) it may be performed. That is, the water-containing gas may be supplied to the sub condenser 22 connected to the sub flow line L2 and condensed. The sub condenser 22 is not particularly limited as long as it can condense the water-containing gas discharged through the sub flow line L2, and may be selected from heat exchange coolers and the like. Condensate condensed through the sub-condenser 22 is wastewater containing moisture and chlorine, and may be supplied to the wastewater storage/treatment tank 60 to be stored or treated.

[3] Oil water separation process

The condensate produced in the condenser 20 is supplied to the oil-water separator 30 to separate regenerated oil from the condensate. That is, the recycled oil is separated and recovered from the condensate containing the recycled oil and water. The oil-water separator 30 is not particularly limited as long as it can separate reclaimed oil from condensate, and a commonly used one may be used. Recycled oil separated in the oil/water separator 30 is supplied to the refiner 40, and wastewater such as water is supplied to the wastewater storage/treatment tank 60 to be stored or treated.

[4] Refining process

The reclaimed oil separated in the oil-water separator 30 is supplied to the refiner 40 to be purified. This purification process may include an impurity removal process and/or a rectification process. Through this refining process, high-purity recycled oil from which impurities are removed may be produced, or high-purity recycled oil separated by grade may be produced. The refiner 40 includes purification equipment (eg, adsorption tower, etc.) for removing trace amounts of impurities contained in the recycled oil, and/or rectification equipment (distillation tower, etc.) for separating the recycled oil by fractional distillation and grade. can do.

According to one embodiment, the refiner 40 includes at least a fractional distillation column, and fractionally distills and refines (rectifies) the reclaimed oil introduced from the oil-water separator 30 according to its boiling point. At this time, the refiner 40 fractionally distills the regenerated oil, and separates it into, for example, petroleum gas grade (methane and ethane, etc.), gasoline grade (naphtha), diesel grade, kerosene grade and / or bunker oil grade, etc. can do. In addition, the recycled oil (grade fuel oil) refined (rectified) in the refiner 40 may be stored/shipped after being liquefied, for example.

[5] Sludge discharge process

After the pyrolysis process is performed, a sludge discharge process for discharging the sludge remaining in the pyrolysis furnace 10 is performed. That is, when the pyrolysis process is completed, sludge remains inside the pyrolysis furnace 10, which is discharged and removed for a subsequent pyrolysis process. Most of the sludge is a fine powder containing solid carbon (CHAR), which is easily scattered in the air and can contaminate the surroundings. Accordingly, the sludge is removed by injecting (sprinkling) treated water into the pyrolysis furnace 10 to lower the temperature and have an appropriate moisture content (for example, about 40% by weight), and then discharged together with the treated water. can After discharged from the pyrolysis furnace 10, the sludge may be stored or treated by supplying it to the waste storage/treatment tank 70.

In discharging the sludge, when the treated water is injected (sprinkled) into the high-temperature pyrolysis furnace 10, the treated water evaporates explosively along with the solid carbon (CHAR) condenser (20) along the main flow line (L1) ), etc., can be introduced. In this case, the recycled oil may be mixed with the recycled oil produced in the subsequent pyrolysis process, thereby contaminating the recycled oil. In order to prevent this, in discharging the sludge, the treated water is injected into the pyrolysis furnace 10 to discharge the sludge, but the main valve V1 is closed and the sub valve V2 is opened so that the sub flow The sludge is discharged through the line (L2). At this time, when the temperature of the pyrolysis furnace 10 drops below about 100° C., the sludge can be discharged by opening and closing the valves V1 and V2. As such, when the sludge is discharged through the sub-flow line L2 by opening and closing the valves V1 and V2, the main flow line L1 and the condenser ( 20), etc., preventing contamination of recycled oil and ensuring quality.

In addition, the sludge may be discharged together with the treated water through the sub-flow line L2 and then supplied to the waste storage/treatment tank 70 to be stored/treated. In addition, the treated water may be, for example, water (wastewater) separated in the oil-water separator 30, water (wastewater) condensed in the sub-condenser 22, and/or the wastewater storage/treatment tank 60 Wastewater stored in can be used.

Meanwhile, in the present invention, each of the lines L1 and L2 is not particularly limited as long as it can provide a passage through which fluid (liquid or gas, etc.) can pass. Each line (L1) (L2) may be composed of a pipe made of a material selected from, for example, a metal material, a synthetic resin material, and/or a ceramic material, and includes a hard and/or flexible pipe. In addition, the lines (L1) (L2), the devices (10) (20) (22) (30) (40) and each device (10) (20) (22) (30) (40) are connected. Valves, pumps, pressure gauges, flow meters, thermometers, liquid level gauges, and/or controllers may be installed in components such as piping.

According to the present invention described above, the water separation process proceeds at the initial stage of pyrolysis of the waste synthetic resin, at least the oil-water separation process is improved, and high-purity recycled oil can be separated and produced from the waste synthetic resin. In the water separation process, at least water (and chlorine) is separated and removed to produce high-purity recycled oil (fuel oil, etc.).

10: pyrolysis furnace 20: condenser
22: sub condenser 30: oil water separator
40: purifier 50: waste gas storage / treatment tank
60: wastewater storage / treatment tank 70: waste storage / treatment tank
L1: main flow line L2: sub flow line
V1: Main valve V2: Sub valve

Claims (8)

A thermal decomposition furnace (10) for generating oil vapor by thermal decomposition of waste synthetic resin;
a condenser 20 condensing the oil vapor generated in the pyrolysis furnace 10 to produce condensate;
a main flow line (L1) installed between the pyrolysis furnace 10 and the condenser 20 and supplying oil vapor generated in the pyrolysis furnace 10 to the condenser 20;
an oil-water separator (30) separating regeneration oil from the condensate produced in the condenser (20);
a main valve (V1) installed on the main flow line (L1);
a sub flow line (L2) connected to the main flow line (L1) and configured to separate and discharge the water-containing gas generated in the thermal decomposition furnace (10) at an early stage of thermal decomposition of the waste synthetic resin; and
Waste synthetic resin regeneration apparatus comprising a sub valve (V2) installed on the sub flow line (L2).
According to claim 1,
The waste synthetic resin regeneration device further includes a sub condenser 22 connected to a sub flow line L2,
The sub-condenser (22) condenses the water-containing gas discharged through the sub-flow line (L2).
According to claim 1,
The oil vapor supplied to the condenser (20) has a moisture content of 2% by weight or less.
According to claim 1 or 2,
The water-containing gas discharged through the auxiliary flow line (L2) contains moisture and chlorine.
A thermal decomposition process of generating oil vapor by thermally decomposing the waste synthetic resin in the thermal decomposition furnace 10;
a condensation process of condensing the oil vapor generated in the pyrolysis process in a condenser 20 to produce condensate; and
An oil-water separation step of supplying the condensate generated in the condensation step to an oil-water separator 30 to separate reclaimed oil from the condensate,
The pyrolysis process,
A water separation step of separating and discharging a water-containing gas generated at an early stage of pyrolysis;
A method of regenerating waste synthetic resin comprising an oil vapor supply step of supplying oil vapor generated by thermal decomposition to a condenser (20) after separating and discharging the water-containing gas.
According to claim 5,
The water separation process is performed at a temperature of 90 ° C to 105 ° C in the pyrolysis furnace 10,
The steam supply process is a method of regenerating waste synthetic resin that proceeds at a temperature higher than 105 ° C in the pyrolysis furnace (10).
A waste synthetic resin regeneration method using the waste synthetic resin regeneration apparatus according to claim 5,
A thermal decomposition process of generating oil vapor by thermally decomposing the waste synthetic resin in the thermal decomposition furnace 10;
a condensation process of condensing the oil vapor generated in the pyrolysis process in a condenser 20 to produce condensate; and
An oil-water separation step of supplying the condensate generated in the condensation step to an oil-water separator 30 to separate reclaimed oil from the condensate,
The pyrolysis process,
The main valve (V1) is closed and the sub valve (V2) is opened until the temperature in the pyrolysis furnace 10 reaches 100 ° C to 120 ° C, and the water-containing gas generated at the beginning of the pyrolysis is transferred to the sub flow line (L2). ) A water separation process for separating and discharging through,
When the temperature in the pyrolysis furnace 10 exceeds 100 ° C. to 120 ° C., the main valve V1 is opened and the sub valve V2 is closed, so that the oil vapor generated by pyrolysis is passed through the main flow line L1 to the condenser. A method for regenerating waste synthetic resin including a step of supplying oil vapor to (20).
According to claim 7,
The method for regenerating the waste synthetic resin further includes a sludge discharge step of discharging the sludge remaining in the pyrolysis furnace 10 after the pyrolysis step,
In the sludge discharging process, treated water is injected into the pyrolysis furnace 10 to discharge the sludge, the main valve V1 is closed and the sub valve V2 is opened, so that the sludge is discharged through the sub flow line L2. Regeneration method of waste synthetic resin that discharges.