KR102618516B1 - Waste plastic washing system that can reuse washing water - Google Patents

Abstract

The present invention relates to a system that reduces the discharge of pollutants while enabling the reuse of washing water used in shredding and washing contaminated waste plastic. More specifically, it relates to the inflow of waste plastic and the inflow of waste plastic. A crushing unit that crushes and discharges; A washing unit that receives the shredded waste plastic discharged from the shredding unit at one end and transfers it to the other end by a screw, and is equipped with a washing nozzle through which washing water is sprayed to wash the transported shredded waste plastic; Washed shredded waste plastic is introduced through the washing unit, an ultrasonic irradiation unit is formed at the front end, one or more stirring blades are formed at the surface where the water level is formed by the received washing water, and a discharge that discharges the shredded waste plastic to the outside is formed at the rear end. A reaction unit consisting of wings; and a reduced-pressure evaporation unit connected to the reaction unit to selectively introduce the washing water contained in the reaction unit, evaporate the inflowed washing water under reduced pressure to discharge it as steam, and separate and discharge foreign substances from the washing water according to the reduced-pressure evaporation. am.

Description

Waste plastic washing system that can reuse washing water}

The present invention relates to a system that can reduce the emission of pollutants while enabling the reuse of washing water used in shredding and washing contaminated waste plastic.

Conventionally, to collect recyclable waste, users simply place the recyclable waste into a recycling bin and a sanitation worker sorts out the recyclable waste placed in the bin.

To explain in more detail, generally, when recyclable waste such as plastic is placed in a dedicated collection box installed in a designated location, a collection company collects the recyclable waste such as plastic contained in the dedicated collection box on the designated date.

However, because the volume of collected waste plastic is large, it takes a lot of space and cost to collect and transport it, causing inefficiency.

As an example of the prior art, Republic of Korea Patent Publication No. 10-2021-0035372 includes a collection box that compresses and stores plastic waste input through an inlet; A weighing unit that measures the weight of plastic waste; and a server that receives the user ID and discharged weight information from the collection box and the weighing unit and generates payment information including the user ID according to preset payment data. A plastic waste collection system comprising a. .

However, the above technology concerns overall management and does not specifically suggest a structure for crushing, washing, and discharging the collected waste plastic in a state suitable for recycling.

Republic of Korea Patent Publication No. 10-2021-0035372

Therefore, the problem to be solved by the present invention is to crush and wash the collected waste plastics so that they can be discharged in a state suitable for recycling. In particular, the washing water used in the washing process is treated with reduced pressure evaporation to enable reuse, thereby removing the pollutants. It is about a system that can reduce emissions.

As a means to solve the above-described problem, the waste plastic washing system of the present invention (hereinafter referred to as “device of the present invention”), which allows reuse of washing water, includes a shredding unit where waste plastic flows in and the inflow waste plastic is shredded and discharged. ; A washing unit that receives the shredded waste plastic discharged from the shredding unit at one end and transfers it to the other end by a screw, and is equipped with a washing nozzle through which washing water is sprayed to wash the transported shredded waste plastic; Washed shredded waste plastic is introduced through the washing unit, an ultrasonic irradiation unit is formed at the front end, one or more stirring blades are formed at the surface where the water level is formed by the received washing water, and a discharge that discharges the shredded waste plastic to the outside is formed at the rear end. A reaction unit consisting of wings; and a reduced-pressure evaporation unit connected to the reaction unit to selectively introduce the washing water contained in the reaction unit, evaporate the inflowed washing water under reduced pressure to discharge it as steam, and separate and discharge foreign substances from the washing water according to the reduced-pressure evaporation. am.

As an example, a condensation tank in which the vapor discharged from the reduced pressure evaporation unit flows in and condenses the introduced vapor, a water tank that collects and receives water condensed in the condensation tank, and the water accommodated in the water tank. It is characterized in that it further includes a water circulation unit including a supply pipe supplying to the reaction unit.

As an example, the water received in the water tank is characterized as hot water.

As an example, the reaction unit is configured to be perpendicular to the direction in which the shredded waste plastic flows at the rear end of the ultrasonic irradiation unit, including a reaction tank, an ultrasonic irradiation unit configured at the front of the reaction tank, and an air curtain is formed by adjusting the aeration intensity at the same time as aeration. It is characterized by including one or more diffusers that allow it to be formed.

As an example, at the front end of the reaction tank, there is a first stirring blade composed of a rotation shaft and a plurality of stirring rods protruding from the rotation shaft, and at the rear end of the first stirring blade there is a rotation shaft and a plurality of stirring rods protruding from the rotation shaft and a plurality of flow elements. It is characterized in that the second stirring wing is composed of a flow forming stage where balls are formed.

As an example, the discharge wing is characterized by being composed of a rotating drum and a plurality of perforated plates that protrude from the rotating drum and have a bent shape.

As an example, the crushing unit consists of a storage tank in which waste plastic is stored and can be opened and closed by a cover, and a crushing tank disposed below the storage tank in a communication structure to crush the waste plastic stored in the storage tank and discharge it to the washing unit. The lower surface of the cover further includes a pressurizing member that is fixed to the cover and includes a plurality of joints and is coupled to an end of each elongated part and includes a plate-shaped pressurizing part, and the cover includes a rotating sphere interlocked with the driving means. It is configured, and is characterized by further including a connecting line that connects the rotating sphere and the pressing part and allows the pressing part to be linked up and down by rotation of the rotating sphere.

In this way, according to the system of the present invention, the shredding and washing of waste plastic are carried out simultaneously, and the removal efficiency of contaminants deposited on the waste plastic is increased in the washing of waste plastic, so that the waste plastic is discharged in a state suitable for recycling. There is an advantage.

In particular, in the system of the present invention, the washing water used and discharged during the cleaning of waste plastic and the decomposition of pollutants is separately collected and treated with reduced pressure evaporation to enable reuse, thereby reducing the final amount of pollutants discharged. , there is an advantage that washing efficiency can be improved compared to washing water at a low temperature by allowing warm washing water to be used for washing in the reaction section.

1 is a schematic diagram showing the system of the present invention.
Figure 2 is a schematic diagram showing a reduced pressure evaporation unit and a water circulation unit according to an embodiment of the present invention.
Figure 3 is a diagram showing a hot water tank according to an embodiment of the present invention.
Figures 4a and 4b are partial diagrams showing the operating state of the reaction unit according to an embodiment of the present invention.
Figure 5 is a diagram showing a first stirring blade according to an embodiment of the present invention.
Figure 6 is a diagram showing a second stirring blade according to an embodiment of the present invention.
Figure 7 is a diagram showing a discharge wing according to an embodiment of the present invention.
Figure 8 is a schematic diagram showing a crushing unit according to an embodiment of the present invention.
9A and 9B are operational state diagrams of the embodiment shown in FIG. 8.

In describing the present invention, the terms and words used in the specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted with meaning and concepts consistent with the technical ideas of.

Referring to Figures 1 and 2, the system 1 of the present invention includes a shredding unit 2 that crushes waste plastic, and a washing process that primarily cleans the waste plastic shredded in the shredding unit 2. A unit (4), a reaction unit (3) that decomposes organic matter deposited on the waste plastic while re-washing the waste plastic washed in the washing unit (4), and a reaction unit (3) provided at the rear of the reaction unit (3) and transported by a screw. It includes a transfer unit 5 that performs and a reduced pressure evaporation unit 6 that selectively receives the washing water used in the reaction unit 3 and evaporates it under reduced pressure to separate foreign substances from the washing water.

The shredding unit 2 receives waste plastic to be treated, crushes the introduced waste plastic, and discharges it. This shredding unit 2 is equipped with a known shredding means and discharges the waste plastic in a shredded state (hereinafter referred to as “shredded waste plastic”).

The cleaning unit 4 has an inclined gradient as shown in FIG. 1 and has a screw 41 and a cleaning nozzle 42 therein.

The washing unit 4 receives shredded waste plastic discharged from the shredding unit 2 at one end, and the inflowed shredded waste plastic moves upward along the screw 41 and is transferred to the other end, an upward movement process. Primary washing is performed by spraying washing water through the washing nozzle 42.

Of course, the drawing number is not shown, but the screw 41 is rotated by a driving means.

The reaction unit (3) is injected with shredded waste plastic in a washed state through the washing unit (4), and is configured with an ultrasonic irradiation unit (32) at the front end, with one or more agitators on the surface where the water level is formed by the received washing water. Wings 34 are formed, and discharge wings 35 are formed at the rear end to discharge shredded waste plastic to the outside.

This reaction unit (3) is configured to perform secondary washing on the shredded waste plastic that has been primarily washed while passing through the washing unit (3). In this case, secondary washing refers to washing with water. Of course, it includes a treatment process that decomposes contaminants such as organic matter deposited on the shredded waste plastic by ultrasonic waves and aeration.

Specifically, the reaction unit 3 includes a reaction tank 31 in which washing water is stored, an ultrasonic irradiation unit 32 formed at the front of the reaction tank 31, and a direction in which shredded waste plastic flows at the rear end of the ultrasonic irradiation unit 32. It is configured to be perpendicular to and may include one or more air diffusers 33 that form an air curtain by controlling the aeration intensity at the same time as aeration.

The reaction unit 3 includes a front end consisting of a first stirring wing 341, an ultrasonic irradiation unit 32, and an air diffuser 33, a second stirring wing 342, and a discharge wing 35, which will be described below. It may be composed of a rear end made up of.

At the front end of the reaction unit 3, contaminants are decomposed mainly by ultrasonic waves and aeration, and at the rear end of the reaction unit 3, the shredded waste plastic that has been purified at the front end is induced and discharged to the outside. This is what I will do. Of course, the decomposition process continues at the rear end due to distributed aeration.

The ultrasonic irradiation unit 32 irradiates the shredded waste plastic with ultrasonic waves so that contaminants are separated and decomposed from the shredded waste plastic. This operating mechanism using ultrasonic waves is a known operating mechanism, and its detailed description will be omitted.

In particular, as shown in FIGS. 4A and 4B, the diffuser 33 is configured to be perpendicular to the direction in which the shredded waste plastic flows at the rear end of the ultrasonic irradiation unit 32, and aeration is performed by the diffuser 33. Ensures that contaminants are separated and decomposed from shredded waste plastic.

In addition, by adjusting the aeration intensity in the diffuser 33, an air curtain can be formed so that the reaction rate by ultrasonic waves can be controlled.

That is, in Figure 4a, aeration (a1) is performed by the diffuser 33, but the degree of aeration is small, allowing the flow of shredded waste plastic P to the rear end of the diffuser 33. In 4b, the aeration (a2) by the diffuser 33 is large, so that an air curtain dividing the reaction tank 31 is formed, thereby showing a state in which the flow of shredded waste plastic (P) to the rear end of the diffuser 33 is not allowed. It is becoming.

In the case of operation as shown in Figure 4b, the ultrasonic irradiation time on the waste plastic (P) is extended to increase the separation and decomposition efficiency of contaminants by ultrasonic waves. In this way, by adjusting the degree of aeration by the air diffuser 33, the reaction time by ultrasonic waves can be adjusted.

In addition, although not shown in the drawing, the air discharge direction by the plurality of air diffusers 33 is configured to be radial, so that the air discharge direction by the external air diffuser 33 is toward the front and rear ends of the reaction tank 31, respectively. By discharging the air, a uniform exhalation effect can be achieved throughout the reaction tank 31, and at the same time, the diffuser 33 located in the center can discharge air in a direction perpendicular to the water surface, thereby forming an air curtain.

That is, the reaction time by ultrasonic waves can be adjusted by adjusting the degree of aeration by the diffuser 33, and the reaction time by ultrasonic waves can be adjusted by operating the diffuser 33 at a specific location. This allows aerobic action to take place.

As shown in FIG. 5, the first stirring blade 341 is formed at the front of the reaction tank 31, and includes a rotating shaft 341-1 and a plurality of stirring rods 341-2 protruding from the rotating shaft 341-1. ) can be composed of.

The rotation shaft 341-1, although not shown in the drawing, allows rotational force to be applied by a driving means.

The first stirring blade 341 is for agitating the shredded waste plastic at the top of the ultrasonic irradiation unit 32, and the stirring rod 341-2 strikes the shredded waste plastic to separate contaminants from the shredded waste plastic. The goal is to make it happen. The purpose is to further increase the decomposition efficiency of pollutants by ultrasonic waves and aeration by stirring by the first stirring blade 341.

The shredded waste plastic that has passed through the front end of the reaction tank 31 may be sufficiently purified by the above operating mechanism, and the second stirring blade 342 is provided at the rear end of the reaction tank 31 to purify it in this way. The shredded waste plastic is guided to the discharge wing (35) at the rear end.

As shown in FIG. 6, the second stirring blades 342 protrude in plural numbers from the rotation shaft 342-1 and the flow forming stage where a plurality of flow holes 342-21 are formed. It can be composed of (342-2).

In the case of the rotation shaft 342-1, although not shown in the drawing, rotational force may be applied by a driving means.

As shown in the drawing, the flow forming end (342-2) protrudes from the rotation axis (342-1) in a "ㄷ"-shaped bent shape. The reason it is configured in such a "ㄷ"-shaped bent shape is because it is made of shredded waste plastic. This is to increase the support force when applying a force pushing in the direction of the discharge wing (35).

In addition, the reason why a plurality of flow holes (342-21) are formed is to allow water to flow through the flow holes (342-21) and guide only the shredded waste plastic toward the discharge wing (35).

In this way, the second stirring blade 342 is configured to guide the purified shredded waste plastic toward the discharge blade 35.

The shredded waste plastic derived from the reaction tank 31 is discharged to the outside through the discharge wing 35.

As shown in FIG. 7, the discharge wing 35 may be composed of a rotating drum 351 and a plurality of perforated plates 352 that protrude from the rotating drum 351 and have a bent shape.

In the case of the rotating drum 351, although not shown in the drawing, rotational force can be applied by a driving means.

As shown in the drawing, the perforated plate 352 is configured in a shape bent in the direction of rotation to facilitate the collection of shredded waste plastic during the rotation process, and perforations are formed so that only the shredded waste plastic is discharged to the outside.

Meanwhile, in the present invention, an example of the crushing unit 2 is presented in FIG. 8.

The shredding unit 2 of the present embodiment includes a storage tank 21 in which waste plastic to be processed is stored and can be opened and closed by a cover 211, and is disposed below the storage tank 21 in a communication structure to form a storage tank 21. It consists of a crushing tank (22) that crushes the waste plastic stored in and discharges it to the washing unit (3).

Additionally, a hopper 23 communicating with the storage tank 21 is provided at the top of the storage tank 21.

The storage tank 21 can be opened and closed by a cover 211, and the cover 211 and the crushing blade 222 described below are interlocked so that when the cover 211 covers the storage tank 21 It is desirable to allow the crushing blade 222 to operate only to prevent safety accidents. Since the interlocking of the cover 211 and the shredding blade 222 can be done using various known technologies, detailed description thereof will be omitted.

The shredding tank 22 is in communication with the storage tank 21 and is disposed below the storage tank 21 to crush the waste plastic stored in the storage tank 21.

The shredding tank 22 includes a body 221 whose upper and lower surfaces are open so that the waste plastic of the storage tank 21 passes from the top to the bottom, a shredding blade 222 formed on the body 221, and It may be configured to include a pair of guide plates 223 that guide the waste plastic that falls into the storage tank 21 toward the crushing blade 222.

The crushing blade 222 consists of a pair, a rotating shaft 222-3, a rotating body 222-1 interlocked with the rotating shaft 222-3, and a plurality of protruding blades from the rotating body 222-1. It consists of rotary blades (222-2).

Although not shown in the drawing, the shredding blades 222 are driven by a driving means, and each shredding blade 222 rotates in the opposite direction to shred waste plastic and discharge it downward.

For this purpose, it is preferable that the rotary blades 222-2 of each rotary body 222-1 overlap each other.

The guide plate 223 is provided in a pair and is configured to guide waste plastic falling from the storage tank 21 toward the shredding blade 222.

Meanwhile, when crushing waste plastic by the crushing blade 222, as mentioned above, the storage tank 21 is closed by the cover 211, but the waste plastic is not well engaged with the crushing blade 222, so the crushing blade 222 is not used. There may be cases where this idle occurs.

Accordingly, in the present invention, as shown in FIG. 8, etc., the lower surface of the cover 211 is each fixed to the cover 211 and has a plurality of joints formed by a kidney part 212-2 and an end of each kidney part 212-2. An example is presented in which the pressing sphere 212 is coupled and includes a plate-shaped pressing part 212-1.

As shown in the drawing, the extension portion 212-2 includes a plurality of joints and corresponds to a configuration in which the pressing portion 212-1 is raised and lowered by folding and unfolding the joints.

The pressurizing port 212 is plate-shaped and made of a material with a relatively high specific gravity such as iron. By pressing the waste plastic at the top of the shredding blade 222 by its own weight, the waste plastic is easily engaged with the shredding blade 222 and is crushed. The goal is to increase efficiency.

For this purpose, the cover 211 is provided with a rotating sphere 211-1 interlocking with the driving means, connecting the rotating sphere 211-1 and the pressing part 212-1, and connecting the rotating sphere 211-1 to the pressing part 212-1. A connecting line 211-2 is further included to enable the upward and downward linkage of the pressing portion 212-1 by rotation of 1).

The rotating sphere (211-1) raises the pressing portion (212-1) as the connecting rope (211-2) is wound, and as the connecting rope (211-2) is released, the pressing portion (212-1) goes down. Although not shown in the drawing, the rotary sphere 211-1 rotates in conjunction with a driving means.

As the connecting line 211-2 is released from the rotary sphere 211-1, the pressing part 212-1 descends due to its own weight, and the rotating sphere 211-1 In 1), the pressurizing portion 212-1 rises as the connecting line 211-2 is wound, which is operated by rotation of the rotary sphere 211-1 by the driving means.

When the connecting line (211-2) is released and the pressurizing part (212-1) descends, the position where the pressurizing part (212-1) approaches the top of the crushing blade (222) is set as the critical length, so that further descent is controlled. Preferably, whether or not to deactivate the crushing blade 222 can be determined by detecting the loosening of the connecting line 211-2. For example, when the connecting line 211-2 is released to a critical length, the crushing blade 222 is automatically deactivated after a certain period of time.

Figure 9a shows when the crushing blade 222 is not operated, the joints of the elongated portion 212-2 are folded so that the pressing portion 212-1 is maintained in an elevated state. In this case, the rotation of the rotary sphere 211-1 may be locked and the pressing portion 212-1 may be maintained in an elevated state.

When the shredding blade 222 operates, as shown in FIG. 9B, the rotating sphere 211-1 is unlocked and the pressurizing part 212-1 descends by its own weight and pressurizes the waste plastic, thereby crushing the waste plastic. Crushing efficiency can be increased. Here, it is appropriate to configure the weight 212-3 to double the pressing force of the pressing portion 212-1.

Meanwhile, the reduced pressure evaporation unit 6 is connected to the reaction unit 3 to selectively introduce the washing water contained in the reaction unit 3 and evaporate the inflow washing water under reduced pressure to discharge it as steam. Separate and discharge foreign substances.

The reduced pressure evaporation unit 6 can selectively receive the washing water contained in the reaction unit 3 through an inflow pipe 60 connected to the lower end of the reaction unit 3.

At this time, the washing water flowing in from the reaction tank 3 is the washing water used in the washing and reaction process of shredded waste plastic, and may contain contaminants such as organic matter and microplastic components that are separated and decomposed in the reaction tank 3.

And the reduced pressure evaporation unit 6 has a sealed space and includes a treatment tank 61 that accommodates the washing water introduced through the inlet pipe 60, and heats the treatment tank 61 while reducing its internal pressure. By doing this, the washing water is evaporated and discharged as steam.

In other words, the reduced pressure evaporation unit 6 allows the used washing water to evaporate even at a relatively low temperature through reduced pressure, and prevents harmful substances from melting into vapor from microplastic components contained in the washing water. .

In this way, the steam generated by the reduced-pressure evaporation process in the reduced-pressure evaporation unit (6) contains only pure water components from which contaminants that may be included in the washing water mentioned above are separated, and the water circulation unit (7) described below. After being transferred to and subjected to condensation treatment, it can be supplied back to the reaction unit 3 as washing water.

In addition, foreign substances and contaminants that have not been evaporated due to the pressure reduction and heating of the reduced pressure evaporation unit 6 may be separated from the washing water and discharged through the discharge pipe 62. For these foreign substances and contaminants, a separate post-treatment facility is required. Due to evaporation of the washing water, it is discharged as concentrated water or sludge with minimal moisture, which has the effect of minimizing the final discharge amount and reducing the load and treatment cost of the post-treatment facility.

Here, the pressure reduction method for the treatment tank 61 of the reduced pressure evaporation unit 6 and the heating method required for evaporation can be implemented in various ways through known techniques, and detailed descriptions thereof will be omitted.

In addition, the system (1) of the present invention further includes a water circulation unit (7) that allows the steam generated by the reduced-pressure evaporation process in the reduced-pressure evaporation unit (6) to flow in and reuse it as washing water for the reaction tank (3). It can be included.

As shown in FIG. 2, the water circulation unit 70 is provided with a transfer pipe 72 through which the steam discharged from the reduced pressure evaporation unit 6 is transferred, and a device for condensing the steam flowing in through the transfer pipe 72. A condensation tank 70, a water tank 71 for collecting and receiving water condensed in the condensation tank 70, and a supply pipe for supplying the water contained in the water tank 71 to the reaction unit 3. (73) may be included.

At this time, the condensation reaction carried out in the condensation tank 70 can be carried out in various ways through known techniques, such as cooling the inside of the condensation tank 70 or creating an environment such that the amount of water vapor inside the condensation tank 70 is saturated. As this is possible, detailed explanations regarding this will be omitted.

The water collected in the water tank 71 after the vapor is condensed in the condensation tank 70 may be hot water with a relatively high temperature compared to the washing water used in the initial reaction unit 3.

That is, the water received in the water tank 71 is hot water with a relatively high temperature, and this hot water is supplied to the reaction unit 3 so that it can be reused as new washing water. And, it is natural that by using hot water as washing water for washing in the reaction unit 3, washing efficiency can be improved compared to low temperature washing water.

Here, the water tank 71 is an insulated tank that delays the lowering of the temperature of the received water as much as possible. Although not shown in the drawing, it is provided with a heating means to selectively heat the received water to keep the temperature of the hot water constant. It is desirable to ensure that it can be maintained.

Meanwhile, according to one embodiment of the present invention, as shown in FIG. 3, hot water is stored inside, and it is provided between the washing unit 4 and the reaction unit 3 and is washed in the washing unit 4. It may further include a hot water tank (8) that allows the discharged shredded waste plastic to pass through the hot water contained therein.

The hot water tank (8) immerses and passes the shredded waste plastic in hot water before the shredded waste plastic flows into the reaction unit (3), thereby causing foreign substances deposited on the surface of the shredded waste plastic to be peeled off and the reaction unit. It makes it possible to further activate the decomposition action of organic matter by (3).

The hot water contained in the hot water tank 8 preferably has a temperature of 40°C to 80°C, and may include one of various known heating means to keep the temperature of the hot water constant.

In addition to the washing water of the reaction unit 3 mentioned above, the washing water used in the washing unit 4 and the hot water contained in the hot water tank 8 can be selectively introduced into the reduced pressure evaporation unit 6.

That is, the washing water used in the washing unit 4 and the hot water contained in the hot water tank 8 may contain harmful substances and foreign substances peeled off from the shredded waste plastic, and the water containing these contaminants is removed from the reduced pressure evaporation unit ( In step 6), it is subjected to reduced-pressure evaporation treatment to enable reuse as washing water.

At this time, when the treatment capacity of the reduced pressure evaporation unit 6 is saturated, some of the influent water may be discharged into factory sewage, etc.

In addition, the water collected through reduced-pressure evaporation in the reduced-pressure evaporation unit 6 and condensation in the condensation tank 7 can be received as hot water in the water tank 71, and the hot water in the water tank 71 is As shown in FIG. 3, hot water is supplied to one or more of the washing unit 4 and the reaction unit 4 through the selective opening and closing operation of the on-off valve, so that hot water can be reused as washing water, and the hot water tank ( It can also be used as a supplement to 8).

Through the above-described content, those skilled in the art will be able to see that various changes and modifications can be made without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention should not be limited to what is described in the detailed description of the specification, but should be determined by the scope of the patent claims.

1: System 2 of the present invention: Crushing unit
3: Reaction section 4: Washing section
5: transfer unit 6: reduced pressure evaporation unit
7: water circulation unit 8: hot water tank

Claims (7)

A shredding unit where waste plastic flows in and the inflow waste plastic is shredded and discharged;
A washing unit that receives the shredded waste plastic discharged from the shredding unit at one end and transfers it to the other end by a screw, and is equipped with a washing nozzle through which washing water is sprayed to wash the transported shredded waste plastic;
Washed shredded waste plastic is introduced through the washing unit, an ultrasonic irradiation unit is formed at the front end, one or more stirring blades are formed at the surface where the water level is formed by the received washing water, and a discharge that discharges the shredded waste plastic to the outside is formed at the rear end. A reaction unit consisting of wings; and
A reduced-pressure evaporation unit that is connected to the reaction unit and selectively flows in the washing water contained in the reaction unit, evaporates the inflowed washing water under reduced pressure and discharges it as steam, and separates and discharges foreign substances from the washing water according to the reduced-pressure evaporation;
The reaction unit,
It includes a reaction tank, an ultrasonic irradiation unit configured at the front of the reaction tank, and one or more air diffusers configured to be perpendicular to the direction in which the shredded waste plastic flows at the rear end of the ultrasonic irradiation unit and controlling the aeration intensity simultaneously with aeration to form an air curtain. A waste plastic washing system that allows reuse of washing water.
According to clause 1,
A condensation tank into which the vapor discharged from the reduced pressure evaporation unit flows and condenses the introduced vapor, a water tank that collects and receives water condensed in the condensation tank, and a supply pipe that supplies water contained in the water tank to the reaction unit. A waste plastic washing system capable of reusing washing water, further comprising a water circulation unit including a.
According to clause 2,
A waste plastic washing system capable of reusing washing water, characterized in that the water received in the water tank is hot water.
delete According to clause 1,
At the front of the reaction tank, a first stirring blade is provided consisting of a rotating shaft and a plurality of stirring rods protruding from the rotating shaft,
A waste plastic washing system capable of reusing washing water, characterized in that a second stirring blade is formed at the rear end of the first stirring blade and consists of a rotating shaft and a flow forming stage that protrudes from the rotating shaft and has a plurality of flow holes.
According to clause 1,
The discharge wing is,
A waste plastic washing system capable of reusing washing water, comprising a rotating drum and a plurality of perforated plates protruding from the rotating drum and having a bent shape.
According to clause 1,
The crushing unit,
It consists of a storage tank in which waste plastic is stored and can be opened and closed by a cover, and a crushing tank disposed below the storage tank in a communication structure to crush the waste plastic stored in the storage tank and discharge it to the washing unit,
On the lower surface of the cover, a pressurizing member is further provided, including an extension part that is fixed to the cover and constitutes a plurality of joints and a plate-shaped pressing part that is coupled to the end of each extension part, and the cover is configured with a rotating sphere interlocked with the driving means. A waste plastic cleaning system in which washing water can be reused, further comprising a connecting line that connects the rotating sphere and the pressing part and allows the pressing part to be linked up and down by rotation of the rotating sphere.

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