KR20220121462A - Methods and systems for decomposition of waste plastic and production of synthetic gas - Google Patents

Abstract

A method and a system for decomposing waste plastics and manufacturing syngas are disclosed. According to an embodiment of the present invention, a method for decomposing waste plastics and manufacturing syngas can include the steps of: preparing liquid BHET (bis(2-hydroxyethyl) terephthalate) by melting the BHET by being linked to the supply of BHET to a reaction chamber; and manufacturing syngas by reacting plasma generated when power is supplied to the reaction chamber with the liquid BHET.

Description

METHODS AND SYSTEMS FOR DECOMPOSITION OF WASTE PLASTIC AND PRODUCTION OF SYNTHETIC GAS

In accordance with the need for decomposition and recycling of PET (polyethyleneterephthalate), which is a representative environmental pollutant, the present invention is a waste plastic for decomposing Bis(2-hydroxyethyl) Terephthalate (BHET), which is an intermediate stage material for PET decomposition, and generating synthetic gas that can be recycled. It relates to a method and system for cracking and syngas production.

In particular, the present invention provides a technique for producing syngas by heating BHET to melt it into a liquid state, and reacting liquid BHET with plasma.

Waste plastics require a lot of time to decompose naturally when discarded, and in this process, they cause enormous pollution to the surrounding environment.

Accordingly, there is an urgent need to develop a more improved technology for stably decomposing waste plastics and recycling them into syngas.

Prior art 1: Synthesis gas production method from bis (2-hydroxyethyl) terephthalate using plasma process (Application No. 10-2019-0149933)

Prior art 2: pyrolysis emulsification method of plastic waste and its device (application number 10-2019-0014719)

An embodiment of the present invention decomposes bis(2-hydroxyethyl) terephthalate (BHET) generated in the depolymerization process of PET into plasma, and in the process, CO, H ₂ , etc. Synthesis gas is generated. Waste plastic It is an object to provide a method and apparatus for cracking and syngas production.

In addition, an embodiment of the present invention aims to solve the problem of plastic waste treatment and utilize it in the field of generation of syngas.

In addition, an embodiment of the present invention uses BHET in a liquid state, and it is possible to generate a larger amount of CO compared to the conventional technique using BHET in a solid state, and H ₂ is also produced.

In addition, an embodiment of the present invention aims to efficiently decompose plastic waste and generate synthesis gas by connecting in series with the conventional plastic (PET) depolymerization process or proceeding simultaneously.

In addition, an embodiment of the present invention aims to provide a method and apparatus for decomposing waste plastics and producing syngas, replacing the conventional plastic pyrolysis process.

According to an embodiment of the present invention, the method for decomposing plastic waste and producing syngas is linked to the supply of BHET (Bis(2-hydroxyethyl) terephthalate) to the reaction chamber to melt the BHET to produce liquid BHET in a liquid state step; and reacting the plasma generated as power is supplied to the reaction chamber and the liquid BHET to produce a synthesis gas.

In addition, the waste plastic decomposition and synthesis gas production system according to an embodiment of the present invention is interlocked with the supply of BHET (Bis(2-hydroxyethyl) terephthalate) to the reaction chamber to melt the BHET to produce liquid BHET in a liquid state. making heating element; And it may be configured to include a reaction unit for producing a synthesis gas by reacting the plasma generated as power is supplied to the reaction chamber, and the liquid BHET.

According to an embodiment of the present invention, bis (2-hydroxyethyl) terephthalate (BHET) generated in the depolymerization process of PET is decomposed into plasma, and in the process, syngas such as CO and H ₂ is generated. It is possible to provide a method and apparatus for decomposing waste plastic and producing syngas.

In addition, according to the present invention, it is possible to solve the problem of plastic waste treatment and utilize it in the field of generation of syngas.

In addition, according to the present invention, by using BHET in a liquid state, a larger amount of CO can be generated compared to the conventional technique using BHET in a solid state, and H ₂ can also be generated.

In addition, according to the present invention, it is possible to efficiently decompose plastic waste and generate synthesis gas by connecting in series with the conventional plastic (PET) depolymerization process or proceeding simultaneously.

In addition, according to the present invention, it is possible to provide a method and apparatus for decomposing waste plastics and producing syngas, replacing the conventional plastic pyrolysis process.

1 is a block diagram showing the configuration of a waste plastic decomposition and synthesis gas production system according to an embodiment of the present invention.
2 is a diagram illustrating the H/W configuration of the BHET-plasma reaction system according to the present invention.
3 is a diagram illustrating an operation flow of a BHET-plasma reaction system according to the present invention.
4 is a view for explaining the measurement of the generated gas according to the BHET solid/liquid state and plasma On/Off.
5 is a diagram illustrating an actual example of a plasma electrode.
6 is a diagram showing an actual example of the heating system.
7 is a diagram for explaining a plasma generation position change experiment.
8 is a flowchart illustrating a method for decomposing waste plastics and producing syngas according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all modifications, equivalents and substitutes for the embodiments are included in the scope of the rights.

Terms used in the examples are used for the purpose of description only, and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

In addition, in the description with reference to the accompanying drawings, the same components regardless of the reference numerals are given the same reference numerals, and the overlapping description thereof will be omitted. In the description of the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

1 is a block diagram showing the configuration of a waste plastic decomposition and synthesis gas production system according to an embodiment of the present invention.

Referring to FIG. 1 , a waste plastic decomposition and synthesis gas production system 100 according to an embodiment of the present invention may include a heating unit 110 and a reaction unit 120 . In addition, the waste plastic decomposition and synthesis gas production system 100 may be configured to selectively include the control unit 130 and the analysis unit 140 , depending on the embodiment.

First, the heating unit 110 interlocks with the supply of BHET (Bis(2-hydroxyethyl) terephthalate) to the reaction chamber to melt the BHET to make liquid BHET in a liquid state. That is, the heating unit 110 may serve to make the liquid BHET in the liquid state by applying heat to the BHET in the solid state supplied to the reaction chamber to melt it.

Here, BHET may be a monomer intermediate material of PET produced by a depolymerization process by mixing ethylene glycol with waste polyester.

In making the liquid BHET, the heating unit 110 may employ a heating system capable of heating the BHET above its melting point.

That is, the heating unit 110 can uniformly heat the BHET by transferring the heat output from the heater to the BHET through a medium.

Here, the melting point of BHET may be 106 degrees to 109 degrees.

The heating system may include a heater that emits heat and a medium such as oil that transfers the heat of the heater to the BHET. The medium can heat a BHET vessel made of glass.

The heating sequence by the heating system may be in the order of heater-medium (oil)-reactor (BHET).

In addition, the reaction unit 120 produces a synthesis gas by reacting the plasma generated as power is supplied to the reaction chamber and the liquid BHET. That is, the reaction unit 120 may serve to obtain a recyclable synthesis gas by electrically reacting the molten liquid BHET with plasma.

Plasma refers to a state in which negatively charged electrons and positively charged ions are mixed in a neutral gas.

The synthesis gas produced in the reaction unit 120 may include CO, H ₂ , and the like, as constituent components.

In particular, the reaction unit 120 produces syngas using liquid BHET as compared to the conventional syngas produced from solid BHET, so the amount of components of the produced syngas can be greatly increased. .

In one embodiment, the plastic decomposition and synthesis gas production system 100 can be produced by flexibly adjusting the components of the synthesis gas.

To this end, the plastic decomposition and synthesis gas production system 100 may be configured to further include a control unit 130 .

That is, the controller 130 may change the composition of the synthesis gas by adjusting the position of the electrode generating the plasma in consideration of the target process.

In the present invention, the position of the electrode to be adjusted may be inside the liquid BHET or outside (surface) of the liquid BHET. The electrode can be exemplified as a wire-wire electrode capable of generating plasma even inside the liquid BHET, or a surface discharge electrode capable of generating a large amount of plasma.

If the target process is a 'NOx reduction process', the control unit 130 may adjust the position of the electrode to the inside of the liquid BHET, so that a syngas with less impurities having reduced NOx content may be produced. That is, the control unit 130 adjusts the position of the electrode to the inside of the liquid BHET, and through the reaction between the plasma generated in the liquid BHET and the liquid BHET, CO and H ₂ as the main components (NOx is almost 0) Syngas with less impurities can be produced.

If the target process is a 'syngas production efficiency process', the controller 130 adjusts the position of the electrode to the surface of the liquid BHET, CO, H ₂ , which is a component of the synthesized gas to be produced. Each content can be made close to the numerical value prescribed|regulated in advance. That is, the control unit 130 adjusts the position of the electrode to the outside of the liquid BHET, and through a reaction between the plasma generated outside the liquid BHET and the liquid BHET, a synthesis gas including CO and H ₂ can be produced.

In one embodiment, the plastic decomposition and syngas production system 100 may automatically supply new BHET to the reaction chamber.

To this end, the controller 130 may measure the height of the liquid BHET in the reaction chamber, and determine the supply of new BHET to the reaction chamber based on the measured height. That is, the controller 130 measures the amount of BHET consumed according to the production of syngas by measuring the height of the liquid BHET remaining in the reaction chamber. New BHET can be supplied automatically.

In another embodiment, the plastic decomposition and syngas production system 100 may control process conditions for producing syngas.

To this end, the plastic decomposition and synthesis gas production system 100 may be configured to further include an analysis unit 140 .

That is, the analysis unit 140 may analyze the synthesis gas, and may perform feedback and automatic control on process conditions. That is, the analysis unit 140 may support feedback and automatic control for adjusting/changing process conditions for later producing syngas through analysis of syngas.

Here, the process conditions refer to process specifications for producing syngas, and for example, specifying the location of plasma generation, adjusting the timing of BHET supply, etc. may be exemplified.

According to an embodiment of the present invention, bis (2-hydroxyethyl) terephthalate (BHET) generated in the depolymerization process of PET is decomposed into plasma, and in the process, syngas such as CO and H ₂ is generated. It is possible to provide a method and apparatus for decomposing waste plastic and producing syngas.

In addition, according to the present invention, it is possible to solve the problem of plastic waste treatment and utilize it in the field of generation of syngas.

In addition, according to the present invention, by using BHET in a liquid state, a larger amount of CO can be generated compared to the conventional technique using BHET in a solid state, and H ₂ can also be generated.

In addition, according to the present invention, it is possible to efficiently decompose plastic waste and generate synthesis gas by connecting in series with the conventional plastic (PET) depolymerization process or proceeding simultaneously.

In addition, according to the present invention, it is possible to provide a method and apparatus for decomposing waste plastics and producing syngas, replacing the conventional plastic pyrolysis process.

The plastic decomposition and synthesis gas production system 100 of the present invention can efficiently generate synthesis gas H ₂ and CO through a plasma reaction with BHET in a liquid state.

In addition, the plastic decomposition and synthesis gas production system 100 may use an electrode capable of generating plasma even inside the liquid state BHET.

In addition, the plastic decomposition and synthesis gas production system 100 may include a heating system for making BHET in a liquid state.

In addition, the plastic decomposition and synthesis gas production system 100 may have process characteristics in which the amount of synthesis gas generated is different depending on the location of the plasma generation, that is, whether it is inside the BHET or outside the BHET.

In addition, the plastic decomposition and synthesis gas production system 100 may enable feedback and automatic control of process conditions (plasma generation location, BHET supply, etc.) by monitoring the synthesis gas generation result.

In addition, the plastic decomposition and synthesis gas production system 100 may decompose the BHET and generate a synthesis gas by heating the BHET to a liquid state and then reacting it with plasma.

In addition, the plastic decomposition and synthesis gas production system 100 may feed back the result of the generated gas measured by the analysis unit through the control unit to adjust the electrode position and the amount of BHET supplied.

In addition, the plastic decomposition and synthesis gas production system 100 can decompose BHET under atmospheric pressure/low temperature conditions and generate synthesis gas, thereby supporting the design of the PET decomposition and recycling process that can replace the existing plastic pyrolysis process. .

In the prior art 1, the possibility of generating syngas by reacting BHET with plasma was demonstrated, but it was necessary to increase the amount of syngas generated.

The plastic decomposition and syngas production system 100 of the present invention effectively generates syngas by reacting liquid BHET with plasma. To this end, the plastic decomposition and synthesis gas production system 100 includes a heating system for melting BHET in a solid state, and uses an electrode capable of generating plasma even in the liquid.

In addition, the plastic decomposition and synthesis gas production system 100 constituted a system including an analysis unit, and through the analysis unit, decomposition when decomposing liquid BHET is higher than distribution when decomposing solid BHET. It can be confirmed that more syngas is produced.

In addition, the plastic decomposition and synthesis gas production system 100 checks the process parameters that can determine the amount of synthesis gas and nitrogen oxide (NOx) generated when the position of the plasma electrode is inside or on the surface of the BHET. In order to adjust these process parameters, the plastic decomposition and synthesis gas production system 100 includes a control unit capable of controlling a plasma generation position and BHET supply, and controls the type and amount of generated gas.

Accordingly, the plastic decomposition and syngas production system 100 of the present invention, it is possible to generate a larger amount of syngas with higher efficiency than the prior art 1.

The differences between the prior art 1 and the present invention are summarized in [Table 1].

[Table 1]

As shown in [Table 1], the plastic decomposition and synthesis gas production system 100, unlike the prior art 1, can efficiently generate synthesis gas H ₂ and CO through a plasma reaction with BHET in a liquid state.

In addition, the plastic decomposition and synthesis gas production system 100, unlike the prior art 1, can use an electrode capable of generating plasma even inside the liquid state BHET.

In addition, the plastic decomposition and synthesis gas production system 100 may include a heating system for making BHET in a liquid state (BHET melting point is 106 °C or higher, and in some embodiments may be 200 °C or higher ).

In addition, the plastic decomposition and synthesis gas production system 100 has a process feature that determines the amount of generated gas generated at a plasma generation location (inside or outside the BHET).

In addition, the plastic decomposition and synthesis gas production system 100 may include a control unit capable of adjusting the plasma generation position and the BHET supply amount based on the analysis result.

In the prior art 2, it is possible to generate carbon compounds by decomposing plastics, but the process is performed at a high temperature condition of at least 1,500 ℃ and a separate device for incineration of harmful gases is required.

On the other hand, the plastic decomposition and synthesis gas production system 100 of the present invention is relatively efficient in terms of equipment and cost for the composition of the process conditions because the process is performed under the condition of 200 ℃. In addition, in the process of the present invention, since harmful substances such as dioxins generated in the thermal decomposition process do not occur, a separate device for incineration of harmful gases is not required.

2 is a diagram illustrating the H/W configuration of the BHET-plasma reaction system according to the present invention.

2 shows a schematic diagram of the BHET-plasma reaction system.

The BHET-plasma reaction system may include a heating unit, a reaction unit, an analysis unit, and a control unit.

The heating unit 210 can be melted by heating the BHET to 106 °C or higher. The heating unit 210 may be composed of a heater and oil. The heating unit 210 may allow the heat emitted from the heater to be evenly transferred to the entire surface of the BHET through the oil.

The reaction unit 220 may interact with the BHET and plasma. The reaction unit 220 may react the BHET with the plasma to generate a synthesis gas including H ₂ , CO, and the like. The position of the electrode generating plasma can be adjusted inside or outside the BHET according to the target process.

The analysis unit 230 may analyze the generated gas. The analysis unit 230 may analyze the synthesis gas flowing into the chiller and feed back the analysis result data to the control unit 240 .

The controller 240 may control the measurement of the BHET surface height, the electrode position, and the BHET supply. That is, the controller 240 may change and adjust the process conditions by using the fed back analysis result data.

3 is a diagram illustrating an operation flow of a BHET-plasma reaction system according to the present invention.

In Figure 3, the BHET- shows an exemplary operation flow of the plasma reaction system.

In ①, the BHET-plasma reaction system can supply BHET to the reaction chamber.

In ②, the BHET-plasma reaction system can be melted by heating the BHET over 106 °C.

In ③, the BHET-plasma reaction system can cause a BHET-plasma reaction.

In ④, the BHET-plasma reaction system can analyze the gas concentration.

In ④, the BHET-plasma reaction system can establish an automatic process control strategy through the analysis of generated gas.

In ⑤, the BHET-plasma reaction system can control the electrode position and BHET supply.

In ⑤, the BHET-plasma reaction system, for example, when NOx reduction is required, the BHET-plasma reaction system may perform the NOx reduction process by adjusting the electrode position to the inside of the BHET.

If it is necessary to increase the amount of synthesis gas generated, the BHET-plasma reaction system may adjust the electrode position to the BHET surface to perform a synthesis gas generation efficiency process. In this case, the BHET-plasma reaction system may require separate NOx removal.

In addition, the BHET-plasma reaction system can control the process through measurement of the BHET solution height.

The BHET-plasma reaction system can control the adjustment of the electrode position in the BHET solution, if necessary to control the generated gas. In addition, the BHET-plasma reaction system can automatically control the supply of BHET when checking the lack of BHET in the reaction chamber.

In ⑥, the BHET-plasma reaction system can control the BHET-plasma reaction.

4 is a view for explaining the measurement of the generated gas according to the BHET solid/liquid state and plasma On/Off.

The plastic decomposition and synthesis gas production system 100 can efficiently generate synthesis gas H ₂ and CO through a plasma reaction with BHET in a liquid state.

As shown in FIG. 4 , in the BHET-plasma reaction, the generation of syngas (H ₂ , CO) can be confirmed.

In normal atmospheric conditions (no BHET state, plasma off), CO 1 ppm, H ₂ 3 ppm, and NOx 1 ppm are measured.

In the solid BHET-plasma reaction (BHET state solid, plasma On), CO 2 ppm, H ₂ 21 ppm, NOx 146 ppm are measured.

In the liquid BHET-plasma reaction (BHET state liquid, plasma On), CO 8890 ppm, H ₂ 2502 ppm, and NOx 171 ppm were measured, which can measure a 0.2 g decrease in BHET.

That is, the liquid BHET-plasma reaction can significantly increase the amount of syngas generated than the solid BHET-plasma reaction.

5 is a diagram illustrating an actual example of a plasma electrode.

The plastic decomposition and synthesis gas production system 100 uses an electrode capable of generating plasma in the liquid state BHET, unlike the prior art.

The plasma electrode according to the present invention may use an electrode capable of generating plasma inside the liquid BHET.

As the plasma electrode according to the present invention, as shown in FIG. 5, a wire-wire electrode capable of generating plasma even inside the liquid BHET, a surface discharge electrode capable of generating a large amount of plasma, etc. can be exemplified. .

6 is a diagram showing an actual example of the heating system.

The plastic decomposition and synthesis gas production system 100 may include a heating system for making liquid BHET.

The heating system according to the present invention is a system capable of heating a reactor above the melting point of BHET.

The melting point of BHET is 106 to 109 °C.

The heating system is a system that can uniformly heat the reactor through the medium.

The heating sequence may be heater → medium (oil) → reactor (BHET) sequence.

7 is a diagram for explaining a plasma generation position change experiment.

The plastic decomposition and synthesis gas production system 100 has a process feature that determines the amount of gas generated according to the plasma generation location (inside or outside the BHET).

Looking at the gas analysis according to the plasma generation location, as shown in FIG. 7 , in the liquid BHET (h = 5 mm), it can be confirmed that 16 ppm of CO, 6 ppm of H ₂ and 0 ppm of NOx are generated. That is, if the plasma generating position is inside the BHET, the plastic decomposition and synthesis gas production system 100 may perform a NOx reduction process.

On the surface of liquid BHET (h = 0 mm), the formation of 5927 ppm of CO, 234 ppm of H ₂ and 82 ppm of NOx can be confirmed. That is, if the plasma generating position is the BHET surface, the plastic decomposition and synthesis gas production system 100 may perform the synthesis gas generation efficiency process.

The present invention is a technology for decomposing liquid BHET through a plasma reaction and generating syngas in the process.

The present invention is a process including a process of heating BHET to make it a liquid, a process of reacting the liquid BHET with plasma, and a control system for adjusting a plasma generation position and an amount of BHET.

In the plasma reaction process, it is possible to generate plasma by placing a plasma electrode inside or on the surface of the liquid BHET.

When comparing the gas concentrations generated by reacting solid and liquid BHET with plasma, it can be confirmed that using liquid BHET increases the amount of H2 and CO by 119 times and 4445 times, respectively, than using solid BHET. can

According to the present invention, it is possible to adjust and optimize the position of the plasma electrode and the BHET supply amount by confirming the analysis result of the generated gas and reflecting it in the BHET-plasma reaction process.

According to the present invention, it is possible to control the amount of synthesis gas generated by adjusting the position of the electrode, or to suppress the generation of NOx gas.

Hereinafter, the work flow of the waste plastic decomposition and synthesis gas production system 100 according to embodiments of the present invention will be described in detail in FIG. 8 .

8 is a flowchart illustrating a method for decomposing waste plastics and producing syngas according to an embodiment of the present invention.

The waste plastic decomposition and synthesis gas production method according to this embodiment may be performed by the waste plastic decomposition and synthesis gas production system 100 .

First, the plastic decomposition and synthesis gas production system 100 interlocks with the supply of Bis(2-hydroxyethyl) terephthalate (BHET) to the reaction chamber to melt the BHET to produce liquid BHET in a liquid state ( 810 ). Step 810 may be a process of making liquid BHET in a liquid state by heating and melting the solid BHET supplied to the reaction chamber.

Here, BHET may be a monomer intermediate material of PET produced by a depolymerization process by mixing ethylene glycol with waste polyester.

In making liquid BHET, the plastic decomposition and synthesis gas production system 100 may employ a heating system capable of heating the BHET above its melting point.

That is, the plastic decomposition and synthesis gas production system 100 can uniformly heat the BHET by transferring the heat output from the heater to the BHET through a medium.

Here, the melting point of BHET may be 106 degrees to 109 degrees.

The heating system may include a heater that emits heat and a medium such as oil that transfers the heat of the heater to the BHET. The medium can heat-lock a BHET vessel made of glass.

The heating sequence by the heating system may be in the order of heater-medium (oil)-reactor (BHET).

In addition, the plastic decomposition and synthesis gas production system 100 reacts the plasma generated as power is supplied to the reaction chamber and the liquid BHET to produce synthesis gas (820). Step 820 may be a process of obtaining a recyclable syngas by electrically reacting the molten liquid BHET with plasma.

Plasma refers to a state in which negatively charged electrons and positively charged ions are mixed in a neutral gas.

Synthesis gas produced in the plastic decomposition and synthesis gas production system 100 may include CO, H ₂ and the like, as constituent components.

In particular, the plastic decomposition and syngas production system 100 produces syngas using liquid BHET compared to the conventional syngas produced from solid BHET, so the amount of the components of the produced syngas is reduced. can be greatly increased.

In one embodiment, the plastic decomposition and synthesis gas production system 100 can be produced by flexibly adjusting the components of the synthesis gas.

To this end, the plastic decomposition and synthesis gas production system 100 may change the composition of the synthesis gas by adjusting the position of the electrode generating the plasma in consideration of the target process.

In the present invention, the position of the electrode to be adjusted may be inside the liquid BHET or outside (surface) of the liquid BHET. The electrode can be exemplified as a wire-wire electrode capable of generating plasma even inside the liquid BHET, or a surface discharge electrode capable of generating a large amount of plasma.

If the target process is a 'NOx reduction process', the plastic decomposition and synthesis gas production system 100 adjusts the position of the electrode to the inside of the liquid BHET to reduce the NOx content of synthetic gas with less impurities. can be made to be produced. That is, the plastic decomposition and synthesis gas production system 100 adjusts the electrode to the inside of the liquid BHET, and through the reaction of the plasma generated in the liquid BHET with the liquid BHET, CO and H ₂ as a main component (NOx is almost zero), which can lead to the production of syngas with less impurities.

If the target process is a 'syngas production efficiency process', the plastic decomposition and synthesis gas production system 100 adjusts the position of the electrode to the surface of the liquid BHET, and the component of the produced synthesis gas Each content of phosphorus _CO and H2 can be made close to the numerical value prescribed|regulated in advance. That is, the plastic decomposition and synthesis gas production system 100 adjusts the position of the electrode to the outside of the liquid BHET, and through the reaction between the plasma and the liquid BHET generated outside the liquid BHET, CO, H ₂ Syngas containing each is produced can make it

In one embodiment, the plastic decomposition and syngas production system 100 may automatically supply new BHET to the reaction chamber.

To this end, the plastic decomposition and synthesis gas production system 100 measures the height of the liquid BHET in the reaction chamber, and determines the supply of new BHET to the reaction chamber based on the measured height. can That is, the plastic decomposition and synthesis gas production system 100 measures the amount of BHET consumed according to the production of syngas by measuring the height of the liquid BHET remaining in the reaction chamber, and the measured height is a selected reference value Below, it is possible to automatically supply new BHET to the reaction chamber.

In another embodiment, the plastic decomposition and syngas production system 100 may control process conditions for producing syngas.

To this end, the plastic decomposition and synthesis gas production system 100 may analyze the synthesis gas and perform feedback and automatic control of process conditions. That is, the plastic decomposition and syngas production system 100 may support feedback and automatic control for adjusting/changing process conditions for later producing syngas through analysis of syngas.

Here, the process conditions refer to process specifications for producing syngas, and for example, specifying the location of plasma generation, adjusting the timing of BHET supply, etc. may be exemplified.

According to an embodiment of the present invention, bis (2-hydroxyethyl) terephthalate (BHET) generated in the depolymerization process of PET is decomposed into plasma, and in the process, syngas such as CO and H ₂ is generated. It is possible to provide a method and apparatus for decomposing waste plastic and producing syngas.

In addition, according to the present invention, it is possible to solve the problem of plastic waste treatment and utilize it in the field of generation of syngas.

In addition, according to the present invention, by using BHET in a liquid state, a larger amount of CO can be generated compared to the conventional technique using BHET in a solid state, and H ₂ can also be generated.

In addition, according to the present invention, it is possible to efficiently decompose plastic waste and generate synthesis gas by connecting in series with the conventional plastic (PET) depolymerization process or proceeding simultaneously.

In addition, according to the present invention, it is possible to provide a method and apparatus for decomposing waste plastics and producing syngas, replacing the conventional plastic pyrolysis process.

The waste plastic decomposition and synthesis gas production method according to the embodiment is implemented in the form of a program command that can be executed through various computer means and can be recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The software may comprise a computer program, code, instructions, or a combination of one or more thereof, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or device, to be interpreted by or to provide instructions or data to the processing device. , or may be permanently or temporarily embody in a transmitted signal wave. The software may be distributed over a networked computer system, stored or executed as a distributed method of decomposing waste plastics and producing syngas. Software and data may be stored in one or more computer-readable recording media.

As described above, although the embodiments have been described with reference to the limited drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described waste plastic cracking and syngas production method, and/or the described components of the described systems, structures, devices, circuits, etc. are described for decomposing waste plastics and syngas Even if it is combined or combined in a form different from the production method, or substituted or substituted by other components or equivalents, an appropriate result may be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: Waste plastic decomposition and synthesis gas production system
110: heating unit 120: reaction unit
130: control unit 140: analysis unit

Claims (10)

in conjunction with the supply of Bis(2-hydroxyethyl) terephthalate (BHET) to the reaction chamber, melting the BHET to form liquid BHET in a liquid state; and
producing syngas by reacting the plasma generated as power is supplied to the reaction chamber and the liquid BHET
Waste plastic decomposition and synthesis gas production method comprising a. The method of claim 1,
Changing the composition of the syngas by adjusting the position of the electrode generating the plasma in consideration of the target process
Waste plastic decomposition and synthesis gas production method further comprising a. 3. The method of claim 2,
If the target process is a 'NOx reduction process',
The step of changing the composition of the syngas is,
adjusting the position of the electrode to the inside of the liquid BHET, so that a syngas with less impurities having reduced NOx content is produced
Waste plastic decomposition and synthesis gas production method comprising a. 3. The method of claim 2,
If the target process is a 'syngas production efficiency process',
The step of changing the composition of the syngas is,
Adjusting the position of the electrode to the surface of the liquid BHET so that each content of CO and H ₂ , which is a component of the produced synthesis gas, approaches a predetermined value
Waste plastic decomposition and synthesis gas production method comprising a. According to claim 1,
The step of melting the BHET to make a liquid BHET in a liquid state comprises:
Heating the BHET uniformly by transferring the heat output from the heater to the BHET through a medium
Waste plastic decomposition and synthesis gas production method comprising a. The method of claim 1,
measuring a height of the liquid BHET within the reaction chamber; and
determining a supply of fresh BHET to the reaction chamber based on the measured height;
Waste plastic decomposition and synthesis gas production method further comprising a. a heating unit that melts the BHET in conjunction with the supply of BHET (Bis(2-hydroxyethyl) terephthalate) to the reaction chamber to produce liquid BHET in a liquid state; and
A reaction unit for producing synthesis gas by reacting the plasma generated as power is supplied to the reaction chamber and the liquid BHET
Waste plastic decomposition and synthesis gas production system comprising a. 8. The method of claim 7,
A control unit that changes the composition of the synthesis gas by adjusting the position of the electrode generating the plasma in consideration of the target process
Waste plastic decomposition and synthesis gas production system further comprising a. 9. The method of claim 8,
If the target process is a 'NOx reduction process',
The control unit is
By adjusting the position of the electrode to the inside of the liquid BHET, the synthesis gas with less impurities with reduced NOx content is produced.
Waste plastic decomposition and synthesis gas production system. 9. The method of claim 8,
If the target process is a 'syngas production efficiency process',
The control unit is
By adjusting the position of the electrode to the surface of the liquid BHET, each content of CO and H ₂ , which is a component of the produced synthesis gas, is close to a predetermined value
Waste plastic decomposition and synthesis gas production system.

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