KR100551939B1 - Airtight successive material input method for thermal decomposition process of wasted synthetic resin - Google Patents

Abstract

The present invention relates to a closed continuous raw material input method of the waste synthetic resin pyrolysis emulsification process, to produce a raw material by making the waste synthetic resin in a gel state and to form a closed state in the raw material input passage using the raw material and to maintain the closed state It blocks the risk of explosion due to the inflow of air and prevents the occurrence of odor due to backflow of gas. It relates to a raw material input method that can be added easily.

Waste synthetic resin, pyrolysis, emulsification, sealing, continuous feeding

Description

Airtight successive material input method for thermal decomposition process of wasted synthetic resin}

1 is a schematic diagram of a device according to a closed continuous raw material input method of the waste synthetic resin pyrolysis emulsification process according to a preferred embodiment of the present invention.

Figure 2 is a process flow diagram of a preferred embodiment of a closed continuous raw material input method of the waste synthetic resin pyrolysis emulsification process according to the present invention.

<Description of the symbols for the main parts of the drawings>

1.Synthetic resin raw material 10 ... Storage hopper 11 ... Raw material inlet

15 Raw material outlet 20 Reactor 25 Raw material input passage

27 Screw feeder 30 Compressed gas tank

The present invention is a method of continuously inputting the raw material in a closed state in the pyrolysis emulsification process of waste synthetic resin, more specifically, in the process of thermally decomposing the waste synthetic resin to oil, to prepare a raw material by making the waste synthetic resin in a gel state and the raw material By forming a sealed state in the raw material input passage by using the input material while maintaining the sealed state, it blocks the risk of explosion inside the reactor due to the inflow of air and prevents the occurrence of odor by gas backflow into the storage hopper The present invention also relates to a sealed continuous raw material input method capable of smoothly injecting low density film-type waste synthetic resin.

With the recent industrialization and the rapid development of petrochemicals, the use of synthetic resins is rapidly increasing, and the disposal of the waste is becoming a social problem. The waste synthetic resin can be recycled or incinerated and landfilled. However, in the case of the limited and incinerated methods, dust, hydrogen chloride (HCl), sulfur oxides (SOx) and nitrogen oxides (NOx) are used. ), The secondary air pollution problem caused by the discharge of air pollutants such as dioxins is serious, and the pollution problem caused by soil pollution, leachate, etc. due to the hard degradability, which is a characteristic of synthetic resins. Accordingly, waste synthetic resins capable of pyrolysis as a method of recycling waste synthetic resins without incineration or landfill are being actively researched and developed for an oilification method or a device for pyrolyzing them to obtain useful oils.

In order to pyrolyze flammable polymer waste such as waste synthetic resin in this pyrolysis oilification technology, the inside of the reactor should be maintained in an oxygen-free reducing atmosphere, preventing gas backflow due to sudden rise in pressure inside the reactor, and low density film type waste resin It should be able to put in.

This problem does not occur in the case of a batch reactor in which a batch of waste synthetic resin is added, the process is finished, and the next batch of waste synthetic resin is input, or a batch-feeding system in which a batch of waste synthetic resin is introduced to induce a reaction. In the case of the continuous reactor to continuously input the problem that the input of the raw material must be made continuously in a closed state.

Looking at the raw material input device of the conventional continuous reactor, the double-valve raw material input device for installing the waste synthetic resin while the valve is installed in double and up and down alternately, the raw material while rotating the cylindrical container divided into fractions of constant capacity Rotary valve type raw material input device for input, screw feeder raw material input device for inputting raw materials while melt-compressing waste synthetic resin using screw feeder equipped with heating means.

However, all of these prior arts cause hot oil vapor to flow back as the pressure of the reactor rises, causing odor, and the waste synthetic resin partially melts and sticks and closes around the inlet, and thus is not closed. There is a problem that the waste synthetic resin is not completely enclosed in the waste synthetic resin, and in the case of the low-density film-type waste synthetic resin such as vinyl or sack, there is a problem that the input itself is impossible.

The present invention has been made to solve the above problems, by producing a raw material by making a waste synthetic resin in a gel state by forming a sealed state in the raw material input passage by using the raw material to keep the sealed state by putting the raw material It aims to block the risk of explosion inside the reactor due to the inflow of air and to prevent the occurrence of odors due to gas backflow.

Another object of the present invention is to put the waste synthetic resin in a gel state, and the closed-type continuous raw material in which the low density film-type waste synthetic resin, such as vinyl or stalk, which is difficult to be added by the conventional dosing method, can be smoothly added together with the raw material in the gel state. To provide a method.

In order to achieve the above object, the raw material input method according to the present invention is a method of continuously inputting the raw materials in a closed state in the waste synthetic resin pyrolysis emulsification process,

(a) preparing a raw material by gelling the waste synthetic resin; (b) injecting the gel raw material into the storage hopper; (c) pressurizing the inside of the storage hopper with compressed gas, one end of which is connected to the raw material outlet formed in the lower portion of the storage hopper, the other end of which is connected to the reactor, and the raw material input passage inclined upward toward the reactor; Filling to form a sealed state; And (d) injecting the gel material into the reactor by a screw feeder provided inside the feed passage while maintaining the sealed state. .

Preferably, the step of preparing the raw material of step (a) is made by mixing EPS (Expanded PolyStyrene) gel or EPU (Expanded PolyUrethane) gel alone or with other waste synthetic resin shreddings.

In addition, the EPS (Expanded PolyStyrene) gel is any one selected from the group consisting of heavy oil, high thermal aromatic content, EPS pyrolysis generating oil, styrene aromatic solvent, xylene aromatic solvent, commercialized EPS solvent. It is prepared by dissolving the waste-foamed styrene resin in a solvent of, EPU (Expanded PolyUrethane) gel, ketone (ether), ether (ether), ester (ester), heavy oil, high aromatic content, styrene (styrene) aromatic solvent, It is preferable to dissolve the waste foamed polyurethane foam with any one solvent selected from the group consisting of xylene aromatic solvent and EPU pyrolysis generating oil.

In addition, in the step (d), respectively measuring the pressure in the storage hopper and the reactor; And comparing the measured pressures with each other and opening the valve to inject the compressed gas into the storage hopper when the pressure inside the reactor is high, and when the pressure inside the reactor is low, the vent line formed at the upper portion of the storage hopper. It is preferable that the check valve provided in the step of balancing the pressure inside the storage hopper and the reactor by shutting off.

Hereinafter, with reference to the accompanying drawings will be described in detail the closed continuous raw material input method of the waste synthetic resin pyrolysis emulsification process according to a preferred embodiment of the present invention. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, it is possible to replace them in the present application point It should be understood that there may be various equivalents and variations.

1 shows an apparatus according to a method of continuously inputting raw materials in a closed state in a waste synthetic resin pyrolysis emulsifying process according to a preferred embodiment of the present invention.

Referring to FIG. 1, the sealed continuous raw material input method according to the present invention includes a storage hopper 10 that is first received before the waste synthetic resin raw material 1 is introduced into the reactor 20. The storage hopper 10 is manufactured to a size that can accommodate an appropriate amount of the waste synthetic resin raw material (1) in a gel state.

A raw material inlet 11 for injecting waste synthetic resin raw materials is connected to an upper surface or a side adjacent to the upper surface of the storage hopper 10. Preferably, the raw material inlet 11 may be provided with an opening and closing member 12 to be selectively opened and closed to adjust the amount of raw material input. More preferably, although not shown in the drawing, the raw material inlet 11 may further include a feeder means such as a screw for continuously feeding the waste synthetic resin raw material 1. Such feeder means may be appropriately modified and employed by those skilled in the art.

The lower portion of the storage hopper 10 has a conical shape narrowing downward as the synthetic resin raw material is easily discharged, and a raw material outlet 15 for discharging the waste synthetic resin raw material 1 is formed at the center of the conical shape. do. The raw material outlet 15 is connected to one end of the raw material input passage 25 to which the other end is connected to the reactor 20 to supply the waste synthetic resin raw material 1 to the reactor 20. Preferably, the raw material outlet 15 has a discharge valve 16 that is selectively opened and closed so that the natural flow of the waste synthetic resin raw material is not generated by the head difference of the waste synthetic resin raw material 1 in the storage hopper 10 It is provided.

The raw material input passage 25 is connected inclined upward toward the reactor 20 so that the waste synthetic resin raw material 1 in a gel state can be easily closed as described below. Preferably, the inside of the raw material input passage 25 is provided with a screw feeder 27 for feeding the waste synthetic resin raw material 1 into the reactor 20 while maintaining the closed state and one end of the screw feeder 27 Is connected to the drive 26. More preferably, the raw material input passage 25 adjacent to the reactor 20 prevents the waste synthetic resin raw material 1 inside the raw material input passage 25 from falling below a required viscosity due to the high temperature inside the reactor 20. To this end, a cooling device 28 is provided along the circumference of the raw material input passage 25. Such a cooling device 28 may be appropriately modified and employed by those skilled in the art.

One side of the storage hopper 10 is formed with a gas injection line 32 for introducing the compressed gas. The gas injection line 32 is connected to the compressed gas tank 30 by a pipe to thereby receive the compressed gas. The gas filled in the storage hopper 10 is preferably a gas other than oxygen, and is made of nitrogen in the embodiment of the present invention. A valve 31 selectively opens and closes in a passage between the compressed gas tank 30 and the storage hopper 10, and the valve 31 is connected to the controller 40 to be described later by wiring.

Inside the storage hopper 10 is provided with a first pressure measuring device 17 for measuring the pressure of the compressed gas. The first pressure measuring device 17 is preferably installed in the upper surface of the storage hopper 10, and is preferably installed in at least the side adjacent to the upper surface in order to prevent being immersed in the input waste synthetic resin raw material. The first pressure measuring device 17 is connected to the control unit 40 by wiring and used to compare the pressure inside the storage hopper 10 and the reactor 20 as described below.

On the upper surface of the storage hopper 10, a vent line 13 for discharging the compressed gas inside the storage hopper 10 is formed. Preferably, the vent line 13 includes a check valve 14 to prevent backflow of air into the storage hopper 10, and more preferably, the vent valve 15 connected to the controller 40 by wiring. Is provided is used to achieve a pressure balance between the storage hopper 10 and the reactor 20 will be described later.

On the other hand, inside the reactor 20, the second pressure measuring device 21 for measuring the internal pressure is provided in the same manner as the storage hopper 10 is connected to the control unit 40 and the wiring. Preferably, the liquid level measuring device (22) for measuring the liquid level of the waste synthetic resin raw material in order to confirm that the level of the waste synthetic resin raw material falls below a predetermined standard as the waste synthetic resin raw material is thermally decomposed into the next process. ) Is provided and connected to the control unit 40 by wiring.

Then, a method of continuously inputting raw materials in a closed state in the waste synthetic resin pyrolysis emulsifying process according to the present invention will be described with reference to the waste synthetic resin raw material input device having the above configuration.

2 is a schematic flow chart illustrating a process of continuously adding waste synthetic resin raw materials in a sealed state according to the present invention.

1 and 2 together, first, the waste synthetic resin raw material 1 to be introduced into the storage hopper 10 is manufactured (S21). The waste synthetic resin raw material (1) is made by mixing EPS (Expanded PolyStyrene) gel or EPU (Expanded PolyUrethane) gel alone or with other waste synthetic resin shreddings. Preferably, the EPS (Expanded PolyStyrene) gel, any one selected from the group consisting of heavy oils with high aromatic content, EPS pyrolysis generating oil, styrene aromatic solvent, xylene aromatic solvent, commercialized EPS solvent It is prepared by dissolving the waste-foamed styrene resin in a solvent of, EPU (Expanded PolyUrethane) gel, ketone (ether), ether (ether), ester (ester), heavy oil, high aromatic content, styrene (styrene) aromatic solvent, It is prepared by dissolving waste foamed urethane foam in any one solvent selected from the group consisting of xylene aromatic solvent and EPU pyrolysis generating oil.

Since the waste synthetic resin raw material 1 should form a sealed state on the raw material input passage 25 as described below, it has a viscosity suitable for forming a sealed state by controlling the amount of EPS or EPU dissolved in each solvent.

When the manufacture of the waste synthetic resin raw material 1 is completed, the waste synthetic resin raw material 1 is introduced into the storage hopper 10 (S22). The waste synthetic resin raw material 1 having a suitable viscosity is introduced into the storage hopper 10 through the raw material inlet 11, and the input amount of the raw material can be controlled by the opening / closing member 12 that is selectively opened and closed. Preferably, it may be continuously supplied by feeder means such as a screw.

When the process of inserting the waste synthetic resin raw material 1 into the storage hopper 10 is completed, the storage hopper 10 is filled with compressed gas to form a sealed state in the raw material input passage 25 (S23). That is, the valve 31 intervening in the passage between the gas compression tank 30 and the storage hopper 10 is opened to fill the storage hopper 10 with compressed gas, thereby leaving oxygen or other gas remaining in the storage hopper. Discharge to the outside of the storage hopper 10 through the vent line (13). At this time, the check valve 14 provided in the vent line 13 prevents oxygen from flowing back into the storage hopper 10. The compressed gas is made of a gas other than oxygen, and preferably made of nitrogen.

After filling the inside of the storage hopper 10 with compressed gas, the discharge valve 16 provided at the raw material outlet 15 formed at the center of the conical shape of the lower portion of the storage hopper 10 is opened. When the discharge valve 16 is opened, the waste synthetic resin raw material 1 is filled in the raw material discharge port 15 by the self-weight of the waste synthetic resin raw material 1 and the pressure of the compressed gas filled in the storage hopper 10. One end of the screw feeder 27 is filled in the raw material input passage 25 connected to the raw material discharge port 15. In this case, since the other end of the raw material input passage 25 is inclined upward toward the reactor, the waste synthetic resin raw material 1 is sequentially stacked from the inclined bottom, and thus the waste synthetic resin raw material of the gel state thus accumulated (1). ), The raw material input passage 25 is closed.

When a sufficient sealed state is formed in the raw material input passage 25, the waste synthetic resin raw material 1 is introduced into the reactor 20 (S24). The waste synthetic resin raw material 1 is introduced into the reactor 20 while being kept closed by the screw feeder 27 inside the raw material input passage 25. In this case, in order to prevent the sealing state from being broken by the driving of the screw feeder 27, it is preferable that the raw material input passage 25 has a sufficient length. On the other hand, the raw material input passage 25 adjacent to the reactor 20 is provided with a cooling device 28 along the circumference to cool the waste synthetic resin raw material 1, the waste synthetic resin raw material (1) by the high temperature of the reactor 20 Is prevented from melting and failing to have a viscosity suitable for forming a hermetic seal. Even though the screw feeder 27 is not operated, when the natural raw material flow occurs due to the water head difference of the waste synthetic resin raw material 1 in the storage hopper 10, the discharge valve 16 is blocked to adjust the raw material input amount. .

On the other hand, the control unit 40 controls the pressure balance to be achieved by comparing the pressure inside the storage hopper 10 and the reactor 20 measured by the first pressure measuring device 17 and the second pressure measuring device 21. do.

In detail, when the gel-like raw material is introduced into the storage hopper 10 through the raw material inlet 11, the gas inside the storage hopper 10 is exhausted through the vent line 13 so that the pressure is not charged in the storage hopper 10. When the pressure rises due to a sudden rush phenomenon in the reactor 20, the first step is to close the waste synthetic resin material formed in the raw material input passage 25. This prevents the harmful gas in the reactor 20 from flowing back into the storage hopper 10. Secondly, the control unit 40 opens the valve 31 to inject compressed gas into the storage hopper 10 and vent valve at the same time. Block 15 to gradually increase the pressure in the storage hopper 10 to be in equilibrium with the pressure in the reactor 20.

On the contrary, when there is a rapid cooling and condensation process at the rear end of the reactor 20 or the process type is a depressurization process, a negative pressure is applied to the inside of the reactor. In this case, the waste synthetic resin raw material formed in the raw material input passage 25 is also hermetically sealed. Acts as a pressure buffer, and the check valve 14 of the vent line 13 is automatically shut off to prevent external air from flowing into the storage hopper 10, and the raw materials in the storage hopper 10 are transferred to the reactor. As the negative pressure is formed in the sealed storage hopper 10 as the pressure goes with the reactor, the controller 40 controls the valve 31 to operate in the pressure balance state.

On the other hand, when the waste synthetic resin raw material (not shown) in the reactor 20 is thermally decomposed to the next process, the liquid level is lowered, the control unit 40 by the liquid level measuring device 22 installed inside the reactor 20 When the reading level is lower than the predetermined standard compared to the predetermined standard, the screw feeder 27 provided in the raw material input passage 25 is operated to inject waste synthetic resin raw material into the reactor 20 to continuously pyrolyze the reaction in the reactor 20. Control to be made.

According to the closed-type continuous raw material input method of the waste synthetic resin pyrolysis emulsification process according to the present invention has the following effects.

First, the raw material of the waste synthetic resin in the gel state is put into the storage hopper and pressurized with compressed gas to remove oxygen from the inside of the storage hopper, and the raw material is continuously introduced while forming the closed state in the raw material input passage with the waste synthetic resin material in the gel state. This prevents air from entering the reactor and prevents the risk of explosion due to high temperatures in the reactor.

Second, by forming a closed state in the raw material input passage with the waste synthetic resin material in the gel state to prevent the back flow of gas into the storage hopper due to the sudden pressure rise inside the reactor.

Third, low-density film-type waste synthetic resins, such as vinyl or hemp, which have been difficult to add in conventional apparatuses, can be smoothly added together with the raw materials in gel state by preparing and injecting the waste synthetic resin in a gel state.

Fourth, it is possible to continuously input the waste synthetic resin raw material can increase the efficiency of the pyrolysis reactor, it becomes possible to control the work process more easily.

Claims (4)

As a method of continuously inserting raw materials in a closed state in the waste synthetic resin pyrolysis emulsification process, (a) preparing a raw material by gelling the waste synthetic resin; (b) injecting the gel raw material into the storage hopper; (c) pressurizing the inside of the storage hopper with compressed gas, one end of which is connected to the raw material outlet formed in the lower portion of the storage hopper, the other end of which is connected to the reactor, and the raw material input passage inclined upward toward the reactor; Filling to form a sealed state; And (d) a step of injecting the gel material into the reactor by a screw feeder provided in the raw material input passage while maintaining the sealed state; closed continuous raw material of the waste synthetic resin pyrolysis emulsification process comprising a Input method. The method of claim 1, The step of preparing the raw material of step (a), the closed continuous resin pyrolysis emulsification process characterized in that the EPS (Expanded PolyStyrene) gel or EPU (Expnaded PolyUrethane) gel alone or mixed with other waste synthetic resin shredding. Raw material input method. The method of claim 2, The EPS (Expanded PolyStyrene) gel is a solvent containing any one selected from the group consisting of heavy oil, aromatic pyrolytic oil, styrene aromatic solvent, xylene aromatic solvent, and commercialized EPS solvent. Prepared by dissolving the waste styrene resin, the EPU (Expnaded PolyUrethane) gel, ketone (ether), ether (ether), ester (ester), heavy oil with a high aromatic content, styrene aromatic solvent, xylene ( xylene) Closed continuous raw material input method of the waste synthetic resin pyrolysis emulsification process characterized in that the waste foamed polyurethane foam is prepared by dissolving the waste foamed polyurethane foam in any one solvent selected from the group consisting of aromatic solvent, EPU pyrolysis generating oil. The method of claim 3, In the step (d), Measuring the pressure inside the storage hopper and the reactor, respectively; And When the pressure inside the reactor is high by comparing the measured pressures, the compressed gas is introduced into the storage hopper by opening a valve, and when the pressure inside the reactor is low, a vent line formed at the upper portion of the storage hopper. Closed check valve is provided to automatically shut off the pressure between the storage hopper and the inside of the reactor; equilibrium continuous raw material input method of the waste synthetic resin pyrolysis emulsification process comprising a.

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