KR102071286B1 - Restoring waste plastic resource method and treatment apparatus by hydrothermal method - Google Patents

Abstract

The present invention relates to a method of recycling a waste plastic through subcritical saturated steam treatment, and an apparatus thereof. The method of recycling a waste plastic through subcritical saturated steam treatment comprises: a pretreatment step of pretreating, by a pretreatment unit, a waste plastic introduced into a first reactor; a hydrothermal treatment step of forming, by the first reactor, solids by performing subcritical saturated steam treatment on the waste plastic; and a recycling step of separating, by a separation unit, the solids into recyclable substances and fuel substances. The pretreatment step further includes: a grinding step of grinding, by the pretreatment unit, the waste plastic; a steam input step of introducing, by a steam supply unit connected to the pretreatment unit, steam into the pretreatment unit; and a specific gravity increasing step of increasing a specific gravity by drying the waste plastic using steam. According to the present invention, a volume of the mixed waste plastic is reduced by 5% after the reaction by the first reactor and thus, the mixed waste plastic can be easily treated, steam recovered in the first reactor can be reused, and thus, it is possible to significantly reduce costs required for treating the mixed waste plastic, and fuel substances which are not classified in the first reactor are separately classified by the separation unit, and thus, it is possible to prevent environmental pollution caused by scattering of the fuel substances.

Description

RESOURCEING WASTE PLASTIC RESOURCE METHOD AND TREATMENT APPARATUS BY HYDROTHERMAL METHOD}

The present invention relates to a method and apparatus for recycling waste plastics mixed. More particularly, the present invention relates to a method and apparatus that can be easily recycled by recycling the mixed waste plastics into subcritical saturated steam so as to make them into recycled materials and solid fuels.

Due to the development of petrochemical refining technology, the technology of manufacturing products formed of plastic material is developing together, and accordingly, domestically produce 6 million tons of plastic products every year. However, since plastics are difficult to reuse unlike other materials, the plastics are treated by simple reclamation without additional treatment. In detail, in order to recycle plastics, waste plastics must be classified by composition, and different chemical classifications must be performed. However, despite the above method, about 40% of the total waste plastic is not classified and remains as a residue, which causes problems such as environmental pollution and cost wastage.

In order to solve such a problem, Prior Document 1 (Korean Patent No. 10-1533053) discloses a method for producing a solid fuel by crushing and incineration of the heated waste synthetic resin. However, in the case of Prior Art 1, it is not possible to prevent the scattering of dust and foreign substances generated during the shredding process of waste plastics, and thus it is not possible to prevent environmental pollution, and as described above, the efficiency of the waste plastics is extremely reduced because it is difficult to select waste plastics. There is this.

In addition, there is a need for recycling waste plastics that have been screened.

Prior Document 1: Republic of Korea Patent Registration No. 10-1533053 (2015.06.25. Registration)

The technical problem of the present invention is to provide an apparatus which may not cause environmental pollution in treating mixed waste plastic.

In addition, the technical problem of the present invention is to provide a device that can minimize the cost of processing mixed waste plastic.

In addition, an object of the present invention is to provide a device that can prevent dust, odor and the like generated during the processing of mixed waste plastic.

In addition, an object of the present invention is to provide a device capable of recycling the mixed waste plastic.

To this end, the present invention is a pre-treatment step of pre-treating the waste plastic to be introduced into the first reactor in the pre-treatment unit, a hydrothermal treatment step of forming a solid by subcritical saturated steam treatment of the waste plastic in the first reactor and a solid in the separation unit It comprises a resource recycling step of separating the recycled material and fuel material, the pretreatment step is a crushing step of pulverizing the waste plastic in the pretreatment unit, a steam input step of injecting steam into the pretreatment unit from the steam supply connected to the pretreatment unit and waste through the steam It further comprises a specific gravity increasing step of drying the plastic to increase the specific gravity. In addition, the present invention is a resource recycling apparatus through the hydrothermal treatment of waste plastics, a pre-processing unit for crushing the waste plastic, a cylindrical first reaction furnace and hydrothermal treatment connected to the pre-treatment and receiving the waste plastic from the pre-treatment unit A steam supply unit for introducing steam to a reactor, the waste plastic is converted into solids in the first reactor and discharged, and is connected to the first reactor and separates the solids into recycled and fuel materials; It further comprises a processing unit for molding the solid material with a predetermined object to form a pallet.

According to the present invention, the waste plastics mixed through the first reactor can be easily processed by reducing the volume to about 20% compared to before the reaction.

In addition, according to the present invention, since the steam recovered in the interior of the first reactor can be reused, the cost for treating the mixed waste plastic can be significantly shortened.

In addition, in the present invention, the fuel material that is not classified in the first reaction furnace is separately classified through the separation unit, and the reaction furnace is a sealed container, thereby preventing the problem of environmental pollution due to the scattering of the fuel material.

In addition, the present invention can be recycled plastic waste material in the form of a pallet can maximize the environmental pollution and solid material production efficiency.

1 is a view showing an overall resource recycling apparatus of mixed waste plastic through subcritical saturated steam treatment according to an embodiment of the present invention.
2 is a view showing a pretreatment process of waste plastic through a pretreatment unit and a specific gravity increase unit according to an embodiment of the present invention.
3 is a view showing a first reactor according to an embodiment of the present invention.
4 is a view showing the material recycling and reuse of steam that proceeds after hydrothermal treatment of waste plastic through a first reactor according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In addition, in order to clearly describe the present invention, parts not related to the present invention are omitted, and the same or similar reference numerals in the drawings represent the same or similar components.

The objects and effects of the present invention may be naturally understood or more apparent from the following description, and the objects and effects of the present invention are not limited only by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a view showing the entire resource recycling apparatus of mixed waste plastic through subcritical saturated steam treatment according to an embodiment of the present invention, Figure 2 is a pre-treatment unit 110 and a specific gravity increase unit according to an embodiment of the present invention A diagram illustrating a pretreatment process of waste plastic through 120.

The apparatus for recycling mixed waste plastics through the subcritical saturated steam treatment according to the present invention is connected to the pretreatment unit 110 and the pretreatment unit 110 to transfer the waste plastics to the first reactor 130 after pulverization. The first reactor 130 for supplying steam (s) to the specific gravity increasing unit 120 to increase the specific gravity of the pulverized waste plastic, connected to the pretreatment unit 110 and receiving the pulverized waste plastic, hydrothermal treatment The waste plastic is connected to the specific gravity increasing unit 120 and the first reactor 130 to supply steam s, respectively, and the waste plastic is converted into a solid in the first reactor 130. Separation unit 180 for separating solids into recycled materials and fuel materials, used in the second reactor 170, the first reactor 130 and the second reactor 170 to receive the recovered steam and hydrothermal treatment again. Condensation unit 150 for recovering the condensed steam (s) and the outside of the first reactor 130 and the second reactor 170 And a processing unit 190 connected to a heating unit 160 and a separation unit 180 which are located in the incense and heat the first reactor 130 and the second reactor 170 and process the recycled material into pallets. .

The pretreatment unit 110 is configured to crush waste plastic. In detail, the pretreatment unit 110 reduces the size of the waste plastic to facilitate the easy subcritical saturated steam treatment in the first reactor 130 to be described later. To this end, the pretreatment unit 110 is provided in a closed box shape and the waste plastic is supplied through an input unit provided separately, and physically pulverizes the waste plastic through a cutting means provided separately. Here, the shape of the pretreatment unit 110 may be provided in various ways such as a cylindrical shape, as well as a box shape. In a more preferred embodiment, the pretreatment unit 110 may be provided with cutting means that can be pulverized so that the size of the waste plastic is 200mm or less. The cutting means may reduce the size of the waste plastic through a method of continuously crushing the waste plastic through the reciprocating motion in the vertical direction, the method of pulverizing the waste plastic by ultrasonic vibration of the blade. In addition, the pretreatment unit 110 may further include a separate compression means for compressing the waste plastic. The compression means may be provided by a press or the like and by physically compressing the waste plastic, it is possible to more easily reduce the size of the waste plastic. In addition, the pretreatment unit 110 receives steam (s) from the specific gravity increasing unit 120 to expose the waste plastic, thereby increasing the specific gravity of the pulverized waste plastic.

The specific gravity increasing unit 120 increases the hydrothermal treatment efficiency by increasing the specific gravity of the waste plastic as the steam (s) is supplied into the pretreatment unit 110. To this end, the specific gravity increasing unit 120 receives the steam (s) from the steam supply unit 140 to be described later, and inputs it to the pretreatment unit (110). Waste plastics pulverized by the input steam (s) is evaporated while the surface moisture is evaporated, thereby increasing the apparent specific gravity of the waste plastics. Specifically, as the volume of waste plastics exposed to steam s decreases and the mass remains constant, the specific gravity of waste plastics increases. As a result, the amount of waste plastic introduced into the first reactor 130 may be increased, thereby maximizing hydrothermal treatment efficiency. As a more preferred embodiment, the specific gravity increasing unit 120 receives the steam (s) recovered from the first reactor 130 and the second reactor 170 to be described later, the actual amount of steam (s) It can be reduced to save the fuel, etc. required for the production of steam (s). In detail, the steam s used for the hydrothermal treatment in the first reactor 130 and the second reactor 170 is moved to the condenser 150 to recover and condense, and the steam supply 140 is By moving the recovered and condensed steam (s) to the specific gravity increasing unit 120 to be exposed to the waste plastic, it is possible to reuse the steam (s).

Referring to Figure 2 will be described the pre-process of the waste plastic until it is introduced into the first reactor (130). In the pretreatment unit 110, the injected waste plastic is pulverized by using separate cutting means and compression means, and the specific gravity increasing unit 120 injects steam (s) into the pretreatment unit 110 to dry the waste plastic. Through this, the pulverized waste plastic is dried and the volume is reduced due to evaporation of moisture to increase specific gravity. The pretreatment unit 110 transports the waste plastic having increased specific gravity to a first reactor 130 through a separate transfer means such as a conveyor. In the pretreatment unit 110, since foreign matters are introduced or pulverized waste plastics do not scatter during the pretreatment of waste plastics, it is possible to prevent the occurrence of environmental pollution problems.

3 is a view showing a first reactor 130 according to an embodiment of the present invention.

The first reactor 130 is configured to hydrothermally process the waste plastic. In detail, the first reactor 130 is pulverized through the pretreatment unit 110 and the specific gravity increasing unit 120 and is supplied from the pretreatment unit 110 to increase the specific gravity. To this end, the first reactor 130 is provided in a sealed cylindrical shape, and receives the steam (s) from the steam supply unit 140 to expose the waste plastic to steam (s) to decompose the waste plastic. In addition, the inside of the first reactor 130 is provided with a pressure of 2 to 3MPa and the temperature is provided to have a temperature within the range of 200 to 250 degrees Celsius. In addition, the steam (s) introduced into the first reactor 130 may be provided with superheated steam and 20 to 50 degrees Celsius higher than a predetermined temperature. This is in order to prevent the efficiency of the hydrothermal treatment of the waste plastic from being deteriorated by condensation of the steam s supplied into the first reactor 130. In a more preferred embodiment, the first reactor 130 may be injected with a small reactive gas such as nitrogen to achieve an oxygen-free environment before receiving the steam (s). In detail, the first reactor 130 may be supplied with nitrogen through a nitrogen supply unit, which is provided separately, to form an internal space in an oxygen free environment. In this way, incomplete combustion, which may occur due to oxygen, may be prevented in the hydrothermal treatment process in the first reactor 130, thereby maximizing thermal efficiency and forming incomplete combustion bodies such as charcoal. This eliminates the need for separate sorting, which minimizes waste. The interior of the first reactor 130 is supplied with steam (s) described in an anoxic environment, and the waste plastic introduced into the waste plastic at a pressure of 2 to 3 MPa at a temperature within the range of 200 to 250 degrees Celsius for 30 minutes to 2 The hydrothermal treatment is carried out by heating for a time. Through this, the waste plastics are evaporated and the fine powder is promoted and reduced in size. Waste plastic treated through the subcritical saturated steam treatment method (hydrothermal treatment) as described above is reduced to 20% by volume compared to before the first reactor 130, partial carbonization occurs to increase the content of fixed carbon As a result, it is converted into recycled material provided as a solid. In detail, the waste plastic is formed as a solid in the first reactor 130, and the solid is divided into a recycled material and a non-hydrothermally decomposed fuel material in powder form, and the fuel material is recycled as a solid fuel. A detailed description of the post-treatment of the solid formed in the first reactor 130 will be described later with reference to FIG. 4.

The steam supply unit 140 supplies the steam s described above into the first reactor 130 to allow the first reactor 130 to perform hydrothermal treatment on waste plastic. To this end, the steam supply unit 140 is provided in the form of a boiler, etc., is directly connected to the first reactor 130 to inject steam (s) into the interior of the first reactor (130). In addition, the steam supply unit 140 heats the steam (s) condensed in the condensation unit 150 to be described later, the second reaction furnace 170 to be described later, the specific gravity increasing unit 120 described above, the heating unit 160 to be described later. To pass). Through this, the second reactor 170, the specific gravity increasing unit 120, and the heating unit 160 perform hydrothermal treatment, drying of waste plastic, and heating of the first reactor 130 using recycled steam s. Each can be done to maximize the thermal efficiency. A more detailed description thereof will be described later with reference to FIG. 4.

The condensation unit 150 is configured to recover and condense steam s used in the first reactor 130. In detail, the condensation unit 150 moves to the steam supply unit 140 in a state in which steam s is recovered and condensed. To this end, the condensation unit 150 is provided in the form of a heat exchanger in which condensing means such as fins are inserted, and lowers the temperature of the steam s. The steam (s) having the temperature lowered as described above is formed of condensed water and moved to the steam supply unit 140, and then heated again in the steam supply unit 140 to heat the second reaction furnace 170, the specific gravity increase unit 120, and the heating. It is delivered to the unit 160. As another embodiment of the present invention, a separate purifying unit may further be provided between the condensing unit 150 and the steam supply unit 140 to purify the condensed water formed by condensation in the condensing unit 150. The purifying unit is configured to include filtration means such as a filter, and filters the contaminants contained in the condensate and then moves the condensate to the steam supply unit 140. Through this, it is possible to minimize the generation of waste water can prevent the environmental pollution problem in advance.

The heating unit 160 is configured to heat the first reactor 130. In detail, the heating unit 160 heats the first reactor 130 to shorten the initial temperature raising time of the first reactor 130 to prevent unnecessary fuel consumption. To this end, the heating unit 160 is located in the outer direction of the first reactor 130. In the present invention, the first heating unit 160 is described as being formed in a cylindrical shape, and the heating unit 160 may be formed to surround the outer circumferential surface of the first reactor 130. In addition, the heating unit 160 receives the steam s recovered through the steam supply unit 140 to heat the first heating unit 160. Through this, the first reactor 130 may shorten the time required to reach a predetermined temperature for inducing a hydrothermal reaction, and condenses the steam s inside the first reactor 130. It can prevent it beforehand. On the other hand, the heating unit 160 may be provided in the second reactor (170) as well as the first reactor 130 will be described later.

4 is a view showing the material recycling and solid fuelization and reuse of steam (s) that proceeds after hydrothermal treatment of waste plastic through the first reactor 130 according to an embodiment of the present invention.

The second reactor 170 is a component that performs hydrothermal treatment on the solid formed in the first reactor 130. In detail, the second reactor 170 receives solids from the first reactor 130 and performs hydrothermal treatment to form recycled and fuel materials from the solids. That is, the second reactor 170 is a configuration for forming more precise recycled material and fuel material. The second reactor 170 is provided in the same manner as the first reactor 130 and receives the steam s recovered from the steam supply unit 140 described above to perform hydrothermal treatment. Through this, the second reactor 170 may hydrothermally process the solids to form recycled materials and solid fuel materials. Through the second reactor 170 as described above, it is possible to hydrothermally process the fuel material that is not decomposed into recycled materials in the first reactor 130, thereby minimizing the formation of the final fuel material. The configuration of the second reactor 170 as described above is optional, and the recycled material and the fuel material formed in the first reactor 130 do not move to the second reactor 170 but to the separation unit 180 to be described later. Can be moved directly and sorted separately.

Separation unit 180 is a configuration for separating the recycled material and the solid fuel material, respectively. In detail, the separating unit 180 separates the fuel material in a state where recycled materials and fuel materials are mixed, thereby preventing the recycled materials and fuel materials from being mixed indiscriminately. To this end, the separation unit 180 is connected to the first reactor 130 and the second reactor 170, and supplies recycled materials and fuel materials from the first reactor 130 and the second reactor 170. Receive. Here, the separating unit 180 is provided with a conveying means such as a conveyor to dry the recycled material and fuel material, in this process to remove the fuel material from the recycled material through the sorting means located in the upper direction of the conveying means. In a more preferred embodiment, the sorting means may be provided as a centrifuge for separating the fuel material through a magnetic force, such as a metal sorter, or by rotating and separating the recycled material and fuel material using a density difference. Through the configuration of the separation unit 180 as described above, only recycled materials can be easily obtained.

Processing unit 190 is a configuration for processing and molding the recycled material formed through the above-described separation unit 180. In detail, the processing unit 190 processes and shapes the recycled material in the form of a pallet or the like so that the recycled material can be easily used. To this end, the processing unit 190 is provided to be connected to the separation unit 180. In addition, the processing unit 190 includes a preset object. Here, the predetermined object is provided with a single resin material having a single composition. Accordingly, the recycled material is blended with the object and molded into pallets. In a more preferred embodiment, the processing unit 190 may be provided with a mixing means such as a stirrer to easily mix the object and recycled materials. In this way, the present invention can be recycled to the waste plastic more easily as compared to the processing unit 190 is not provided with the material can maximize the yield associated with the mixed waste plastic treatment.

In a more preferred embodiment, the recycled material may be mixed with an object formed of a recycled chip made of PE or PP, and then manufactured into a pallet. In detail, when the recycled material is blended in the processing unit 190, the object may be provided as a PE recycled chip, a PP recycled chip, or the like. Accordingly, the recycled material finally meets the PE recycled chip or PP recycled chip and is formed into PE recycled pellet or PP recycled pellet. Therefore, it is possible to recycle the fuel having a composition in accordance with the requirements of the operator, it is possible to maximize the recycling yield of the mixed waste plastic. In addition, fuel materials other than the recycled materials are solid fueled as the chlorine content contained in the post-treatment unit separately provided is reduced. In detail, the fuel material may be manufactured and recycled into a solid fuel having less than 0.5% of chlorine as the process is performed to supply the aftertreatment to remove the contained chlorine. In addition, the solid fuel as described above can be easily recycled as an advanced fuel because the harmful gases and dust generated during combustion are minimized. Through the construction of the processing unit and the post-treatment unit as described above, it is possible to realize the material recycling of the mixed waste plastic ultimately, it is possible to solve problems such as environmental pollution and waste of cost due to the difficulty of processing the mixed waste plastic.

Hereinafter, a process of forming recycled materials and fuel materials after hydrothermal treatment in the first reactor 130 will be described. The solid formed by the hydrothermal treatment in the first reactor 130 is moved to the separation unit 180 or is introduced into the second reactor 170. In addition, the steam (s) used for the hydrothermal treatment of the waste plastic in the first reactor 130 is moved to the condensation unit 150 is converted to condensed water and is moved to the steam supply unit 140 is introduced into the second reaction unit. . The solids moved to the separation unit 180 are separated into recycled materials and fuel materials, and the solids moved to the second reactor 170 are hydrothermally treated again by steam s introduced into the second reaction unit. Through this, the solid material is hydrothermally treated to be formed of recycled materials and fuel materials, moved to the separating unit 180, and then separated into recycled materials and fuel materials. In addition, the recycled material is moved to the processing unit 190 and mixed with a predetermined object to be processed into a pallet. Therefore, the recycled material for the waste plastic can be formed as much as possible, thereby increasing the reuse rate of the waste plastic. In addition, the reactor is a sealed container can minimize the scattering of waste plastic and foreign matter can prevent the occurrence of environmental pollution in advance. In addition, since the fuel material according to the present invention is obtained by hydrothermal treatment in the first reactor and the second reactor, it can be pulverized and used as recycled materials, thereby significantly increasing the recycle ratio for waste plastics. In addition, since the recycled material according to the present invention is provided with a material having a single composition, it can be used as a building material, a molding raw material, and a building material, and thus has great versatility.

Hereinafter, with reference to Figures 2 and 4 will be described in detail the resource recycling method of mixed waste plastic through the subcritical saturated steam treatment according to the present invention.

Resource recycling method of mixed waste plastic through subcritical saturated steam treatment according to the present invention includes a pre-treatment step, hydrothermal treatment step and a resource step.

The pretreatment step is a step for facilitating subcritical saturated steam treatment of the waste plastics, and pretreatment of the waste plastics before being introduced into the first reactor. To this end, the pretreatment step further includes a grinding step, a steam input step and a specific gravity increase step. In the crushing step, the waste plastic is pulverized so that the waste plastic can be easily subcritical saturated steamed. In detail, the pretreatment unit crushes the injected waste plastic and pulverizes it to 200 mm or less. In a more preferred embodiment, the pretreatment unit reduces the size of the waste plastic through separate cutting means. Steam input step is to dry the waste plastic, the steam supply to the pre-treatment unit from the steam supply connected to the pre-treatment unit to remove the moisture of the waste plastic. The specific gravity increase step is to increase the specific gravity of the waste plastic so that the waste plastic can be easily processed. The specific gravity increase part connected to the pretreatment unit inputs steam supplied from the steam supply unit to the pretreatment unit to increase the specific gravity as the volume of the waste plastic decreases. do. Therefore, a larger amount of waste plastic than the same area can be introduced into the first reactor, thereby maximizing efficiency.

The hydrothermal treatment step is a step of subcritical saturated steam treatment of the waste plastic introduced into the first reactor. To this end, in the first reactor, the subcritical saturated steam treatment is performed by heating the waste plastic for 30 minutes to 2 hours in a temperature environment within a range of 200 to 250 degrees Celsius with a pressure of 2 to 3 MPa. Through this, the waste plastic made of a polymer is decomposed to form a solid. In detail, the waste plastic treated through the subcritical saturated steam treatment method (hydrothermal treatment) is reduced to 5% of the size before the first reactor 130 is input, and partial carbonization occurs to increase the fixed carbon content. As a result, it is converted into recycled material provided as a solid. On the other hand, the solid material is divided into recycled material and undecomposed fuel material in the form of powder, and the recycled material and the fuel material are selected in each of the recycling step described later.

Recycling is the step of separating the recycled and fuel materials from mixing. To this end, the recycling step selects and separates recycled materials and fuel materials from the separator connected to the first reactor. In a more preferred embodiment, a conveying means such as a conveyor is provided to dry the recycled material and the fuel material, and in this process, the fuel material may be removed from the recycled material through the sorting means located above the conveying means. In addition, the sorting means may be provided as a centrifuge for separating the fuel material through a magnetic force, such as a metal sorter or the like, by rotating and separating the recycled material and fuel material using a density difference. Through this, only the recycled material can be easily obtained in the recyclization step, and the recycled material is recycled into fuel which is easily burned by having a water content of 10% or less.

The processing step is a step provided for easier use of recycled materials. In detail, the processing step ultimately realizes the resourceization of mixed waste plastics. To this end, the processing unit connected to the separation unit in the processing step is supplied with recycled material from the separation unit, and the inside is stirred and blended with the object made of a single resin material. Through the processing step as described above, the recycled material is processed into a fuel such as a pallet, it is possible to realize the resource more easily.

The recycling method of the mixed waste plastic according to the present invention further includes a steam recovery step. In detail, in the steam recovery step, the steam used in the hydrothermal treatment step is recovered and condensed, and then transferred to the steam supply unit to reuse the steam. To this end, the steam recovery step recovers and condenses the steam located inside the first reactor in the condenser connected to the first reactor. In detail, the condensation unit lowers the temperature of the recovered steam, converts the condensate into condensed water, and transfers the condensed water to the steam supply unit. Through this, the steam supply unit may receive more condensed water having a reduced volume compared to steam provided as a gas, thereby converting more condensed water into steam. In another embodiment of the present invention, the method of recycling the mixed waste plastics according to the present invention includes a steam reclaiming step. In detail, the steam reclaiming step is a step of recovering and condensing steam used in the second reactor connected to the first reactor. More specifically, the condensation unit is connected to the second reactor in the steam re-recovery step and converted to condensate by recovering and condensing steam used in the second reactor.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Should be regarded as falling within the scope of the claims.

As those skilled in the art to which the present invention pertains, various permutations, modifications, and changes are possible without departing from the technical spirit of the present invention. It is not limited by.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

Claims (7)

Pre-processing unit 110 for grinding the waste plastic;
A first cylindrical reactor 130 connected to the pretreatment unit 110 and receiving the waste plastic from the pretreatment unit 110 to process subcritical saturated steam; And
It includes; Steam supply unit 140 for injecting steam (s) into the first reactor (130),
The waste plastic is converted into solids in the first reactor 130 and discharged.
A separation unit 180 connected to the first reactor 130 and separating the solids into recycled materials and fuel materials, respectively; and
And a processing unit 190 for mixing the recycled material with a predetermined object to form a pallet.
Is further connected to the first reactor 130, and further comprises a nitrogen supply unit for introducing nitrogen to achieve an oxygen-free environment in the first reactor (130),
In order to prevent condensation in the first reactor 130, the steam s introduced into the first reactor 130 may be 200 to 250 degrees Celsius, which is 20 to 50 degrees Celsius higher than a predetermined temperature. Have a temperature,
A condenser connected to the first reactor 130 and lowering the temperature of the steam s discharged from the first reactor 130 to form condensed water and supplying the condensed water to the steam supply unit 140. By being further provided with 150, more steam (s) can be stored at once,
It is provided between the pretreatment unit 110 and the first reactor 130, and further includes a specific gravity increase unit 120 for increasing the specific gravity of the waste plastic directed to the first reactor 130,
The steam supply unit 140 recovers the steam (s) discharged from the inside of the first reactor 130 and inputs it to the specific gravity increasing unit 120,
The waste plastic located inside the specific gravity increasing unit 120 is exposed to the steam (s) to increase the specific gravity by decreasing the volume,
Further comprising a heating unit 160 located in the outer direction of the first reactor 130 to heat the first reactor 130,
The steam supply unit 140 recovers the steam s in the first reactor 130 and supplies the steam s to the heating unit 160.
Fuel that is not decomposed into the recycled material in the first reactor 130 by being connected to the first reactor 130 and receiving the solids inside the first reactor 130 and subcritically saturated steam treatment. Further comprising a second reactor 170 to minimize the formation of the material,
The steam supply unit 140 recovers the steam s in the first reactor 130 and inserts it into the second reactor 170.
The processing unit 190 is mixed with the recycled PE recycled material or PP recycled chip made of a single resin to form a PP recycled pellet or PE recycled pellet to maximize the recycling yield of mixed waste plastic,
The fuel material is added to the after-treatment unit, as the chlorine component is reduced, characterized in that formed as a solid fuel that minimizes harmful gases and dust during combustion, resource recycling apparatus of mixed waste plastic through subcritical saturated steam treatment.
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