Microwave waste plastic treatment apparatus and waste plastic thermal decomposition device therefor

Abstract

According to the present invention, a waste plastic treatment device is provided, comprising: a waste plastic pyrolysis device that uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas; a pipeline structure that provides a pipeline channel for the pyrolysis gas to be discharged from and flow through the waste plastic pyrolysis device; a gas condensation mechanism that condenses the pyrolysis gas to generate pyrolysis oil; and a pyrolysis oil storage section that stores the pyrolysis oil. The waste plastic pyrolysis device includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave feeder that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The heating element is plate-shaped and horizontally arranged in the space, positioned so that the waste plastic to be pyrolyzed is in direct contact with the heating element. In the space, microwaves are radiated downwards through radiation ports arranged opposite to the heating element to penetrate the waste plastic to be pyrolyzed and are absorbed by the heating element.

Description

Technical Field

[0001] This invention relates to a technology for treating waste plastics, and more specifically, to an apparatus for producing pyrolytic oil by thermally decomposing waste plastics. Background Technology

[0002] Thermolytic oil, which is oil recovered in liquid form after waste plastics are decomposed at high temperatures, has received much attention in the waste plastic recycling industry in recent years.

[0003] Equipment for producing pyrolysis oil must be equipped with a pyrolysis device that decomposes waste plastics by applying heat. Patent No. 10-1729859 describes a configuration that uses the heat from a burner as a heat source for pyrolysis of waste plastics. However, when using the heat from such a burner as a heat source for pyrolysis, the improvement in thermal efficiency is limited, and there is also the problem of generating harmful gases during combustion. Summary of the Invention

[0004] Technical problems to be solved

[0005] The purpose of this invention is to provide a waste plastic treatment equipment and a waste plastic pyrolysis device for producing pyrolysis oil through efficient and environmentally friendly geothermal decomposition of waste plastics.

[0006] Technical solution

[0007] To achieve the aforementioned objectives of the present invention, according to one aspect of the present invention, a waste plastic treatment device is provided, comprising: a waste plastic pyrolysis apparatus that uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas; a pipeline structure that provides a pipeline channel for the pyrolysis gas to be discharged from and flow through the waste plastic pyrolysis apparatus; a gas condensation mechanism that condenses the pyrolysis gas to generate pyrolysis oil; and a pyrolysis oil storage section that stores the pyrolysis oil, wherein the waste plastic pyrolysis apparatus includes a pyrolysis furnace with an internal space for accommodating waste plastics to be pyrolyzed, a microwave feeder that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat, wherein the heating element is plate-shaped and horizontally arranged in the space, and positioned such that the waste plastics to be pyrolyzed are in direct contact with the heating element, wherein microwaves are radiated downward through radiation ports arranged opposite to the heating element to penetrate the waste plastics to be pyrolyzed and are absorbed by the heating element.

[0008] To achieve the aforementioned objective of the present invention, according to another aspect of the present invention, a waste plastic treatment device is provided, comprising: a waste plastic pyrolysis apparatus that uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas; a pipeline structure that provides a pipeline channel for the pyrolysis gas to be discharged from and flow through the waste plastic pyrolysis apparatus; a gas condensation mechanism that condenses the pyrolysis gas to generate pyrolysis oil; and a pyrolysis oil storage section that stores the pyrolysis oil, wherein the waste plastic pyrolysis apparatus includes a pyrolysis furnace having an internal space for accommodating waste plastics to be pyrolyzed, a microwave feeder that generates microwaves and supplies them to the accommodating space, and a heating element that absorbs microwaves to generate heat, wherein the gas condensation mechanism is disposed in at least a portion of the pipeline channel, so that the pyrolysis gas generates pyrolysis oil as it flows through the pipeline channel, and the gas condensation mechanism includes a gas condensation pipe for the flow of cooling fluid.

[0009] To achieve the aforementioned objective of the present invention, according to another aspect of the present invention, a waste plastic treatment device is provided, comprising: a waste plastic pyrolysis apparatus that uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas; a pipeline structure that provides a pipeline channel for the pyrolysis gas to be discharged from and flow through the waste plastic pyrolysis apparatus; a gas condensation mechanism that condenses the pyrolysis gas to generate pyrolysis oil; and a pyrolysis oil storage section that stores the pyrolysis oil. The waste plastic pyrolysis apparatus includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave feeder that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The heating element is disposed below the waste plastic to be pyrolyzed in the space, and microwaves penetrate the waste plastic to be pyrolyzed and are absorbed by the heating element in the space. The gas condensation mechanism is disposed in at least a portion of the pipeline channel, and the pyrolysis gas generates pyrolysis oil as it flows through the pipeline channel.

[0010] To achieve the above-mentioned objective of the present invention, according to another aspect of the present invention, a waste plastic pyrolysis apparatus is provided, comprising: a pyrolysis furnace having an internal space for accommodating waste plastic to be pyrolyzed; a microwave feeder that generates microwaves and supplies them to the accommodating space; and a heating element disposed in the lower part of the waste plastic in the pyrolysis furnace and in direct contact with the waste plastic, absorbing the supplied microwaves to pyrolyze the waste plastic.

[0011] Technical effect

[0012] According to the present invention, all the objectives of the present invention described above can be achieved. Specifically, since the heat generated by the heating element that absorbs microwaves to generate heat is used to thermally decompose waste plastics, energy efficiency can be improved, and no harmful gases are generated due to combustion.

[0013] Furthermore, since the gas condensation mechanism for generating pyrolysis oil by condensing pyrolysis gas is located inside the pipeline through which the pyrolysis gas flows, no additional condensation device is required, thereby reducing the overall size of the equipment.

[0014] Furthermore, by using a vacuum pump that creates a vacuum inside the pyrolysis furnace and a nitrogen purging mechanism that blows nitrogen into the furnace, the amount of oxygen inside the furnace can be significantly reduced before the pyrolysis reaction, thereby preventing safety accidents such as fires. Attached Figure Description

[0015] Figure 1 This is a diagram that briefly illustrates the configuration of a waste plastic treatment device according to an embodiment of the present invention;

[0016] Figure 2 It is shown Figure 1 A diagram showing the configuration of the waste plastic pyrolysis device in the waste plastic treatment equipment shown.

[0017] Figure 3 It is shown Figure 1 A diagram of the gas condenser pipe installed in the waste plastic processing equipment shown;

[0018] Figure 4 It is shown Figure 3 A diagram of another embodiment of the gas condenser shown. Detailed Implementation

[0019] The structure and function of embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Figure 1 The following diagram briefly illustrates the configuration of a waste plastic treatment device according to an embodiment of the present invention. See also... Figure 1According to one embodiment of the present invention, a waste plastic treatment device 100 includes a waste plastic thermal decomposition device 110 for generating gas by thermally decomposing waste plastics, a thermal decomposition oil storage section 150 for storing thermal decomposition oil generated by condensing the gas generated by the waste plastic thermal decomposition device 110, a pipeline structure 160 for supplying the gas discharged from the waste plastic thermal decomposition device 110, and a filter 198 for screening out harmful substances from the gas generated from the waste plastic thermal decomposition device 110. The waste plastic treatment device 100 uses microwaves as an energy source to thermally decompose waste plastics to generate gas, and condenses the gas generated by the thermal decomposition of waste plastics to produce liquid oil, i.e., thermal decomposition oil. In this embodiment, the waste plastics to be thermally decomposed include various resin materials such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC). In this embodiment, the waste plastics to be thermally decomposed can be in various forms such as powder, bulk material, fragments, and blocks.

[0021] The waste plastic pyrolysis device 110 uses microwaves as an energy source to pyrolyze waste plastics to generate gas. The waste plastic pyrolysis device 110 includes a pyrolysis furnace 120, a microwave supply unit 130 that supplies microwaves to the pyrolysis furnace 120, a heating element 140 that receives microwaves to generate heat, a vacuum pump 145 that removes oxygen from the pyrolysis furnace 120, and a nitrogen purging mechanism 148 that purges the pyrolysis furnace 120 with nitrogen.

[0022] See Figure 1 and Figure 2 The pyrolysis furnace 120 has an internal space 124 for accommodating waste plastic P to be pyrolyzed. A microwave-heated element 140 is installed in the space 124 of the pyrolysis furnace 120. Externally, the pyrolysis furnace 120 is equipped with a microwave supply 130, a vacuum pump 145, and a nitrogen purging mechanism 148. An exhaust port 126 is formed on the pyrolysis furnace 120 for discharging the gas from the space 124. In the space 124 of the pyrolysis furnace 120, the waste plastic P undergoes pyrolysis, generating gas. Hereinafter, the gas generated from the pyrolysis of the waste plastic is referred to as "pyrolysis gas." The pyrolysis gas from the space 124 is discharged through the exhaust port 126. The pyrolysis gas discharged from the space 124 through the exhaust port 126 condenses to form pyrolysis oil.

[0023] Microwave supply 130 supplies microwaves to the receiving space 124 of the pyrolysis furnace 120. The microwave supply 130 includes a magnetron 132 that generates microwaves and a waveguide 135 that transmits the microwaves generated by the magnetron 132 to the receiving space 124 of the pyrolysis furnace 120. In this embodiment, the microwave supply 130 is described as being positioned at the upper end of the pyrolysis furnace 120, above the receiving space 124 formed within the pyrolysis furnace 120. In this embodiment, as shown, multiple microwave supply units 130 are depicted, but this is not the case; a single unit is also possible and falls within the scope of this invention.

[0024] Magnetron 132 generates microwaves. Magnetron 132 comprises a conventional magnetron for generating microwaves, therefore a detailed description of magnetron 132 is omitted here. The microwaves generated by magnetron 132 are transmitted to the containment space 124 of the pyrolysis furnace 120 via waveguide 135.

[0025] Waveguide 135 transmits microwaves generated by magnetron 132 to the housing space 124 of pyrolysis furnace 120. The microwaves transmitted through waveguide 135 are radiated downwards within housing space 124 via microwave radiation ports 136 formed at the end of waveguide 135 and at the top of housing space 124. Waveguide 135 comprises a conventional waveguide; therefore, a detailed description of waveguide 135 is omitted here.

[0026] The heating element 140 absorbs microwaves radiated into the containment space 124 of the pyrolysis furnace 120 by multiple microwave feeders 130 to generate heat. The heating element 140 is plate-shaped and is arranged horizontally, approximately at the lower part of the containment space 124, opposite to the microwave radiation port 136. In this embodiment, the heating element 140 is described as a SiC heating element with silicon carbide (SiC) as its main component. Waste plastic P to be pyrolyzed is placed on the heating element 140. The waste plastic P is in direct contact with the heating element 140. Microwaves radiated downward from the top of the containment space 124 through the microwave radiation port 136 penetrate the non-conductive waste plastic P and are transferred to the heating element 140. Heat is generated in the heating element 140 by the microwaves, and the waste plastic P is pyrolyzed by the heat generated by the heating element 140.

[0027] In this embodiment, the heating element 140 is fixedly disposed within the receiving space 124 of the pyrolysis furnace 120, but the present invention is not limited thereto. The heating element may also be disposed at the bottom of a trolley capable of loading waste plastics to be pyrolyzed and moving in and out of the pyrolysis furnace 120 for movable use.

[0028] In addition, the waste plastics to be thermally decomposed can be continuously fed to the pyrolysis furnace 120 via a moving mechanism such as a conveyor belt. In this case, a heating element can be attached to the outer surface of the conveyor belt, or a material forming the heating element can be coated on it.

[0029] Vacuum pump 145 expels air from the containment space 124 of the pyrolysis furnace 120 to remove oxygen. Vacuum pump 145 operates before radiating microwaves into containment space 124, thereby significantly reducing the amount of oxygen within containment space 124. This reduces the fire hazard caused by the high-temperature environment of pyrolysis.

[0030] Nitrogen purging mechanism 148 purges nitrogen into the containment space 124 of the pyrolysis furnace 120. Nitrogen purging mechanism 148 operates after the air in containment space 124 has been purged by vacuum pump 145 and before microwave radiation is applied to containment space 124, thereby further reducing the oxygen content in containment space 124. This reduces the fire hazard caused by the high-temperature environment of pyrolysis. Nitrogen purging mechanism 148 can also purge nitrogen into containment space 124 to cool the pyrolysis furnace 120 after the pyrolysis process of waste plastic P is completed.

[0031] See Figure 1 The pyrolysis oil storage section 150 stores pyrolysis oil generated by the condensation of pyrolysis gases produced by the waste plastic pyrolysis device 110. The pyrolysis oil storage section 150 includes a first pyrolysis oil storage tank 152 and a second pyrolysis oil storage tank 156 arranged sequentially along the direction of the flow of pyrolysis gases discharged from the pyrolysis furnace 120, respectively storing pyrolysis oil.

[0032] The first pyrolysis oil storage tank 152 provides a first storage space for storing pyrolysis oil. A first inlet 153 and a first outlet 154 are formed at the upper end of the first pyrolysis oil storage tank 152. Pyrolysis gas flows into the first storage space of the first pyrolysis oil storage tank 152 through the first inlet 153, and exits from the first storage space of the first pyrolysis oil storage tank 152 through the first outlet 154. Further, pyrolysis oil flows into the first storage space of the first pyrolysis oil storage tank 152 through the first inlet 153 and the first outlet 154.

[0033] The second pyrolysis oil storage tank 156 serves as an additional pyrolysis oil storage tank, providing additional storage space, i.e., a second storage space, for storing pyrolysis oil. A second inlet 157 and a second outlet 158 ​​are formed at the upper end of the second pyrolysis oil storage tank 156. Pyrolysis gas flows into the second storage space of the second pyrolysis oil storage tank 156 through the second inlet 157, and exits from the second storage space of the second pyrolysis oil storage tank 156 through the second outlet 158. Furthermore, pyrolysis oil flows into the second storage space of the second pyrolysis oil storage tank 156 through the second inlet 157 and the second outlet 158.

[0034] In this embodiment, the pyrolysis oil storage unit 150 is described with two pyrolysis oil storage tanks 152 and 156. However, it may also have one or more pyrolysis oil storage tanks, which is also within the scope of this invention.

[0035] The piping structure 160 provides a conduit for the flow of pyrolysis gases discharged from the waste plastic pyrolysis apparatus 110. The piping structure 160 includes an inlet pipe section 170, an intermediate pipe section 180, and an outlet pipe section 190 arranged sequentially along the flow direction of the pyrolysis gases discharged from the containment space 124 of the pyrolysis furnace 120.

[0036] An inlet pipe section 170 extends between the pyrolysis furnace 120 and the first pyrolysis oil storage tank 152, communicating with the exhaust port 126 formed on the pyrolysis furnace 120 and the first inlet 153 formed on the first pyrolysis oil storage tank 152. The pyrolysis gas in the containment space 124 formed on the pyrolysis furnace 120 flows along the inlet pipe section 170 and flows into the first pyrolysis oil storage tank 152. The inlet pipe section 170 includes an upstream inlet pipe 171 extending upward from the pyrolysis furnace 120, a downstream inlet pipe 173 extending upward from the first pyrolysis oil storage tank 152, an inlet extension pipe 175 extending between the upstream inlet pipe 171 and the downstream inlet pipe 173, an upstream inlet connecting pipe 178 connecting the upstream inlet connecting pipe 175 and the upstream inlet connecting pipe 171, and a downstream inlet connecting pipe 179 connecting the downstream inlet connecting pipe 175 and the downstream inlet connecting pipe 173. The pyrolysis gas discharged from the pyrolysis furnace 120 flows sequentially along the upstream side pipe 171 of the inlet, the upstream side connecting pipe 178 of the inlet, the extension pipe 175 of the inlet, the downstream side connecting pipe 179 of the inlet, and the downstream side pipe 173 of the inlet and flows into the first pyrolysis storage tank 152.

[0037] The upstream side pipe 171 of the inlet extends upward from the pyrolysis furnace 120. The lower end of the upstream side pipe 171 is connected to the exhaust port 126 formed on the pyrolysis furnace 120, and the upper end of the downstream side pipe 171 is connected to the upstream side connecting pipe 178 of the inlet.

[0038] The downstream side pipe 173 of the inlet extends upward from the first pyrolysis oil storage tank 152. The lower end of the downstream side pipe 173 is connected to the first inlet 153 formed on the first pyrolysis oil storage tank 152, and the upper end of the upstream side pipe 173 is connected to the downstream side connecting pipe 178 of the inlet.

[0039] Figure 3 This is a longitudinal section view of the downstream side pipe 173 of the inlet section. Figure 3The interior of the downstream side pipe 173 of the inlet is shown. See also Figure 3 A gas condenser 174 is installed inside the downstream side pipe 173 of the inlet. A cooling fluid W, such as cooling water, flows through the gas condenser 174. The gas condenser 174 is wound and extended in a coil shape along the length of the downstream side pipe 173 of the inlet. This shape increases the contact area between the pyrolysis gas flowing along the downstream side pipe 173 of the inlet and the gas condenser 174. At least a portion of the pyrolysis gas flowing through the downstream side pipe 173 of the inlet condenses to form pyrolysis oil through the cooling fluid W flowing through the gas condenser 174. The pyrolysis oil generated in the downstream side pipe 173 of the inlet falls by its own weight and flows into the first storage space of the first pyrolysis oil storage tank 152 for storage.

[0040] In this embodiment, the gas condenser tube 174 is described as being wound and extended in the form of a coil, but the invention is not limited thereto. See also Figure 4 The gas condenser pipe 274 extends in a straight line along the length of the downstream side pipe 173 of the inlet. The gas condenser pipe 274 is arranged coaxially with the downstream side pipe 173 of the inlet, and the downstream side pipe 173 of the inlet and the gas condenser pipe 274 form a double-layer pipe. Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser tube 274 shown is an embodiment of the gas condensation mechanism of the present invention.

[0041] See Figure 1 An inlet extension pipe 175 extends between the upstream pipe 171 and the downstream pipe 173 of the inlet. The inlet extension pipe 175 is located above the upstream pipe 171 and the downstream pipe 173 of the inlet and extends approximately horizontally. The upstream and downstream ends of the inlet extension pipe 175 are connected to the upstream connecting pipe 178 and the downstream connecting pipe 179 of the inlet, respectively. Although not shown, the inlet extension pipe 175 also includes... Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser 274 is shown. As a result, the pyrolysis gas condenses inside the inlet extension pipe 175 to generate pyrolysis oil. The pyrolysis oil generated in the inlet extension pipe 175 flows sequentially along the downstream connecting pipe 179 and the downstream pipe 173 of the inlet, and flows into the first pyrolysis oil storage tank 152 for storage. In this embodiment, the inlet extension pipe 175 is described as extending approximately horizontally, but it can also extend downwards towards the downstream side of the flow direction of the pyrolysis gas. In this case, it can prevent the pyrolysis oil generated in the inlet extension pipe 175 from flowing towards the pyrolysis furnace 120.

[0042] The upstream connecting pipe 178 of the inlet section connects the inlet extension pipe 175 and the upstream pipe 171 of the inlet section. The upstream connecting pipe 178 of the inlet section is generally L-shaped, and the upstream end and the downstream end of the upstream connecting pipe 178 of the inlet section are connected to the upstream pipe 171 and the inlet extension pipe 175 of the inlet section, respectively.

[0043] The downstream connecting pipe 179 of the inlet section connects the inlet section extension pipe 175 and the inlet section downstream pipe 173. The downstream connecting pipe 179 of the inlet section is generally L-shaped, and its downstream end and upstream end are connected to the inlet section downstream pipe 173 and the inlet section extension pipe 175, respectively.

[0044] An intermediate pipe section 180 extends between a first pyrolysis oil storage tank 152 and a second pyrolysis oil storage tank 156, communicating with a first outlet 154 formed on the first pyrolysis oil storage tank 152 and a second inlet 157 of the second pyrolysis oil storage tank 156. Pyrolysis gas from the first storage space of the first pyrolysis oil storage tank 152 flows along the intermediate pipe section 180 and into the second pyrolysis oil storage tank 156. The intermediate pipe section 180 includes an upstream intermediate pipe 181 extending upward from the first pyrolysis oil storage tank 152, a downstream intermediate pipe 183 extending upward from the second pyrolysis oil storage tank 156, an intermediate extension pipe 185 extending between the upstream intermediate pipe 181 and the downstream intermediate pipe 183, an upstream intermediate connecting pipe 188 connecting the upstream intermediate pipe 185 and the upstream intermediate pipe 181, and a downstream intermediate connecting pipe 189 connecting the downstream intermediate pipe 183 and the downstream intermediate pipe 185. The pyrolysis gas discharged from the first pyrolysis oil storage tank 152 flows sequentially along the upstream side pipe 181, the upstream side connecting pipe 188, the extension pipe 185, the downstream side connecting pipe 189, and the downstream side pipe 183 and flows into the second pyrolysis oil storage tank 156.

[0045] An upstream side pipe 181 extends upward from the first pyrolysis oil storage tank 152. The lower end of the upstream side pipe 181 connects to a first outlet 154 formed on the first pyrolysis oil storage tank 152, and the upper end of the downstream side pipe 181 connects to an upstream side connecting pipe 188. Although not shown, the interior of the upstream side pipe 181 is provided with… Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser 274 is shown. As a result, the pyrolysis gas condenses inside the upstream pipe 181 of the intermediate section to generate pyrolysis oil. The pyrolysis oil generated in the upstream pipe 181 of the intermediate section falls by its own weight and flows into the first storage space of the first pyrolysis oil storage tank 152, where it is stored.

[0046] The intermediate downstream side pipe 183 extends upward from the second pyrolysis oil storage tank 156. The lower end of the intermediate downstream side pipe 183, serving as its downstream end, connects to the second inlet 157 formed on the second pyrolysis oil storage tank 156, and the upper end of the intermediate downstream side pipe 183, serving as its upstream end, connects to the intermediate downstream side connecting pipe 188. Although not shown, the intermediate downstream side pipe 183 has an internal structure... Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser 274 is shown. As a result, the pyrolysis gas condenses inside the downstream side pipe 183 of the intermediate section to form pyrolysis oil. The pyrolysis oil generated in the downstream side pipe 183 of the intermediate section falls by its own weight and flows into the second storage space of the second pyrolysis oil storage tank 156, where it is stored.

[0047] The intermediate extension pipe 185 extends between the intermediate upstream pipe 181 and the intermediate downstream pipe 183. The intermediate extension pipe 185 is located above the intermediate upstream pipe 181 and the intermediate downstream pipe 183, and extends approximately horizontally. The upstream and downstream ends of the intermediate extension pipe 185 are connected to the intermediate upstream connecting pipe 188 and the intermediate downstream connecting pipe 189, respectively. Although not shown, the intermediate extension pipe 185 also includes... Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser 274 is shown. As a result, the pyrolysis gas condenses inside the intermediate extension pipe 185 to form pyrolysis oil. The pyrolysis oil generated in the intermediate extension pipe 185 can flow upstream and be stored in the first pyrolysis oil storage tank 152, or flow downstream and be stored in the second pyrolysis oil storage tank 156. In this embodiment, the intermediate extension pipe 185 is described as extending substantially horizontally, but it may also extend downwards towards the upstream or downstream side, or towards both sides, which is also within the scope of this invention.

[0048] The upstream connecting pipe 188 of the middle section connects the middle extension pipe 185 and the upstream pipe 181 of the middle section. The upstream connecting pipe 188 of the middle section is roughly L-shaped, and the upstream end and the downstream end of the upstream connecting pipe 188 of the middle section are connected to the upstream pipe 181 of the middle section and the middle extension pipe 185, respectively.

[0049] The downstream connecting pipe 189 of the middle section connects the middle extension pipe 185 and the downstream pipe 183 of the middle section. The downstream connecting pipe 189 of the middle section is roughly L-shaped, and its downstream end and upstream end are connected to the downstream pipe 183 of the middle section and the middle extension pipe 185, respectively.

[0050] In this embodiment, which has two pyrolysis oil storage tanks 152 and 156, the invention is described with one intermediate pipe section 180, but the invention is not limited thereto. Those skilled in the art will understand that when there is only one pyrolysis oil storage tank, the intermediate pipe section 180 is not provided; when there are three or more pyrolysis oil storage tanks, two or more intermediate pipe sections 180 are provided accordingly, and this also falls within the scope of the invention.

[0051] The discharge pipe section 190 extends from the second pyrolysis oil storage tank 156. The pyrolysis gas from the second storage space of the second pyrolysis oil storage tank 156 flows along the discharge pipe section 190 and is discharged to the outside. The discharge pipe section 190 includes a discharge pipe 191 extending upward from a second discharge outlet 158 ​​formed on the second pyrolysis oil storage tank 156. Although not shown, the interior of the discharge pipe 191 may be provided with… Figure 3 The gas condenser 174 shown is Figure 4 The gas condenser 274 is shown. Thus, the pyrolysis gas can condense inside the discharge pipe 191 to generate pyrolysis oil. The pyrolysis oil generated in the discharge pipe 191 can be stored by falling under its own weight and flowing into the second storage space of the second pyrolysis oil storage tank 156.

[0052] Filter 198 removes harmful substances containing foreign matter from the pyrolysis gas generated by the waste plastic pyrolysis device 110. In this embodiment, the filter 198 is described as being installed on the upstream side pipe 171 of the inlet pipe section 170. In this embodiment, the harmful substances removed by the filter 198 include dust and halogen compounds.

[0053] The following description of the waste plastic processing equipment 100, which has been explained in terms of structure so far, will now be explained in terms of its function.

[0054] First, in order to thermally decompose the waste plastic P, before radiating microwaves into the containment space 124 of the thermal decomposition furnace 120, a vacuum pump 145 is operated while the containment space 124 contains the waste plastic P, to initially and significantly reduce the amount of oxygen in the containment space 124. Next, a nitrogen purging mechanism 148 is operated to purge nitrogen into the containment space 124 to further reduce the amount of oxygen in the containment space 124. Under the action of the vacuum pump 145 and the nitrogen purging mechanism 148, the amount of oxygen in the containment space 124 is significantly reduced, preventing fires caused by the high-temperature environment of the subsequent thermal decomposition process.

[0055] Next, the magnetron 132 of the microwave supply unit 130 operates to generate microwaves. The microwaves are radiated into the containment space 124 via the waveguide 135. According to experiments, the heating element 140 is heated by the microwaves radiated into the containment space 124, reaching a temperature of 600-800°C, thereby reducing the temperature of the containment space 124 to 300-400°C. Furthermore, in the configuration of the waste plastic pyrolysis apparatus 110 according to the above embodiment, the temperature at the top of the containment space 124 is maintained at 200°C, thereby reducing the possibility of safety accidents. The waste plastic P is emulsified at a temperature above 300°C, and the emulsified waste plastic is decomposed and vaporized by the microwaves and the high-temperature heating element 140, thereby generating pyrolysis gas. The pyrolysis gas generated in the containment space 124 is discharged from the containment space 124 through the exhaust port 126. Although not shown, the waste plastic processing equipment 100 may also include an exhaust fan for discharging and circulating the pyrolysis gas generated in the containment space 124.

[0056] The pyrolysis gas discharged from the containment space 124 of the pyrolysis furnace 120 flows sequentially along the inlet pipe section 170, the first pyrolysis oil storage tank 152, the intermediate pipe section 180, the second pyrolysis oil storage tank 156, and the outlet pipe section 190.

[0057] As the pyrolysis gas flows through the inlet pipe section 170, it is condensed by the gas condensation pipes 174 and 274 respectively provided in the downstream pipe 173 and the extension pipe 175 of the inlet section, thereby generating pyrolysis oil. The pyrolysis oil generated in the inlet pipe section 170 is stored in the first pyrolysis oil storage tank 152.

[0058] As the pyrolysis gas flows through the intermediate pipeline section 180, it is condensed by the gas condensers of the upstream pipeline 181 and the downstream pipeline 183 of the intermediate section, thereby generating pyrolysis oil. The pyrolysis oil generated in the upstream pipeline 181 is stored in the first pyrolysis oil storage tank 152, and the pyrolysis oil generated in the downstream pipeline 183 is stored in the second pyrolysis oil storage tank 156.

[0059] As the pyrolysis gas flows through the discharge pipe section 190, it is condensed by the gas condenser pipe provided in the discharge pipe section 191, thereby generating pyrolysis oil. The pyrolysis oil generated in the discharge pipe section 191 is stored in the second pyrolysis oil storage tank 156.

[0060] According to the waste plastic treatment equipment 100 of this embodiment, the waste plastic pyrolysis device 110 generates pyrolysis oil that meets the conditions for pyrolysis oil by directly irradiating the waste plastic P with microwaves, without the use of a catalyst. Existing heaters or liquefied natural gas (LNG) methods produce high molecular weight pyrolysis oil with carbon C20-40, thus requiring additional catalyst and heating treatment to produce low molecular weight pyrolysis oil with carbon C10-20. In this embodiment, since no catalyst is used, there are no issues related to catalyst addition technology, catalyst life, or quality, which are associated with using catalysts. Therefore, it is easier to manage, simplifies the process, and reduces costs. According to this embodiment, pyrolysis is centered on carbon C16, thereby producing pyrolysis oil with properties similar to those produced by existing catalyst treatments.

[0061] The present invention has been described above through embodiments, but the present invention is not limited thereto. The embodiments can be modified or altered without departing from the spirit and scope of the present invention, and those skilled in the art will recognize that such modifications and alterations also fall within the scope of the present invention.

Claims

1. A waste plastic processing device, comprising: The waste plastic pyrolysis device uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas. A piping structure that provides a conduit for the pyrolysis gas to be discharged and flow from the waste plastic pyrolysis device; A gas condensation mechanism condenses the pyrolysis gas to generate pyrolysis oil; and Thermolytic oil storage section, which stores the pyrolytic oil, The waste plastic pyrolysis device includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave supply unit that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The heating element is plate-shaped and horizontally arranged in the receiving space, with the waste plastic to be decomposed in direct contact with the heating element. Within the containment space, microwaves are radiated downwards through radiation ports arranged opposite to the heating element to penetrate the waste plastic to be decomposed and are absorbed by the heating element.

2. The waste plastic treatment equipment according to claim 1, wherein, The heating element is a SiC heating element containing silicon carbide (SiC).

3. The waste plastic treatment equipment according to claim 1, wherein, The waste plastic pyrolysis device also includes a vacuum pump for discharging air from the containment space. The vacuum pump operates before microwave radiation reaches the containment space to reduce the amount of oxygen within the containment space.

4. The waste plastic treatment equipment according to claim 3, wherein, The waste plastic pyrolysis device also includes a nitrogen purging mechanism for purging nitrogen into the containment space. The nitrogen purging mechanism operates after the vacuum pump is running and before the microwave radiation is applied to the containment space, in order to further reduce the amount of oxygen in the containment space.

5. The waste plastic treatment equipment according to claim 1, wherein, The waste plastic pyrolysis device also includes a nitrogen purging mechanism for purging nitrogen into the containment space. The nitrogen purging mechanism operates after the thermal decomposition of the waste plastic to be decomposed is completed, in order to cool the heated thermal decomposition furnace.

6. A waste plastic processing device, comprising: The waste plastic pyrolysis device uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas. A piping structure that provides a conduit for the pyrolysis gas to be discharged and flow from the waste plastic pyrolysis device; A gas condensation mechanism condenses the pyrolysis gas to generate pyrolysis oil; and Thermolytic oil storage section, which stores the pyrolytic oil, The waste plastic pyrolysis device includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave supply unit that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The gas condensation mechanism is disposed in at least a portion of the pipeline channel, and the pyrolysis gas generates pyrolysis oil as it flows through the pipeline channel. The gas condensation mechanism includes a gas condensation pipe for the flow of cooling fluid.

7. The waste plastic treatment equipment according to claim 6, wherein, The gas condenser extends along the length of the pipe channel in a coil-like manner.

8. The waste plastic treatment equipment according to claim 6, wherein, The gas condenser extends in a straight line along the length of the pipe channel and together with the pipe forming the pipe channel, forms a double-layer pipe.

9. The waste plastic treatment equipment according to claim 6, wherein, The pyrolysis oil storage section includes a pyrolysis oil storage tank with internal storage space for storing pyrolysis oil. The pipeline structure includes an inlet pipe section that connects the storage space and the receiving space. In the inlet pipe section, the gas condensation mechanism is provided in a section located above the storage space and extending less upwards towards the downstream side.

10. The waste plastic treatment equipment according to claim 9, wherein, The pyrolysis oil storage section also includes an additional pyrolysis oil storage tank with internal storage space for storing pyrolysis oil. The pipeline structure also includes an intermediate pipeline section connecting the storage space and the additional storage space. The intermediate pipeline section includes an upstream intermediate pipeline extending upward from the pyrolysis oil storage tank and a downstream intermediate pipeline extending upward from the additional pyrolysis oil storage tank. The gas condensation mechanism is further disposed in the upstream pipe of the intermediate section and the downstream pipe of the intermediate section.

11. A waste plastic processing device, comprising: The waste plastic pyrolysis device uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas. A piping structure that provides a conduit for the pyrolysis gas to be discharged and flow from the waste plastic pyrolysis device; A gas condensation mechanism condenses the pyrolysis gas to generate pyrolysis oil; and Thermolytic oil storage section, which stores the pyrolytic oil, The waste plastic pyrolysis device includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave supply unit that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The heating element is positioned below the waste plastic to be decomposed within the containment space. Within the containment space, microwaves penetrate the waste plastic to be decomposed and are absorbed by the heating element. The gas condensation mechanism is disposed in at least a portion of the pipeline channel, and the thermal decomposition gas generates thermal decomposition oil as it flows through the pipeline channel.

12. The waste plastic treatment equipment according to claim 11, wherein, Also includes: A filter that removes harmful substances from the pyrolysis gases.

13. The waste plastic treatment equipment according to claim 12, wherein, The hazardous substances include dust and halogen compounds.

14. The waste plastic treatment equipment according to claim 12, wherein, The pyrolysis oil storage section includes a pyrolysis oil storage tank with internal storage space for storing pyrolysis oil. The pipeline structure includes an inlet pipe section that connects the storage space and the receiving space. The filter is installed on the inlet pipe section.

15. A waste plastic pyrolysis device, comprising: A pyrolysis furnace, which provides internal space to hold waste plastics to be pyrolyzed; A microwave supply device that generates microwaves and supplies them to the containing space; as well as A heating element is disposed in the lower part of the waste plastic in the pyrolysis furnace and is in direct contact with the waste plastic to absorb the supplied microwaves to pyrolyze the waste plastic.

16. The waste plastic pyrolysis device according to claim 15, wherein, Within the containment space, microwaves are radiated downwards through radiation ports arranged opposite to the heating element to penetrate the waste plastic to be decomposed and are absorbed by the heating element.

17. The waste plastic pyrolysis device according to claim 15, wherein, The heating element is plate-shaped and arranged horizontally in the accommodating space.

18. A waste plastic processing device, comprising: The waste plastic pyrolysis device uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas. A piping structure that provides a conduit for the pyrolysis gas to be discharged and flow from the waste plastic pyrolysis device; A gas condensation mechanism condenses the pyrolysis gas to generate pyrolysis oil; and Thermolytic oil storage section, which stores the pyrolytic oil, The waste plastic pyrolysis device includes a pyrolysis furnace that provides an internal space for accommodating the waste plastic to be pyrolyzed, a microwave supply unit that generates microwaves and supplies them to the space, a heating element that absorbs microwaves to generate heat, a vacuum pump that exhausts air from the space, and a nitrogen purging mechanism that purges nitrogen into the space. The heating element is plate-shaped and horizontally arranged in the receiving space, with the waste plastic to be decomposed in direct contact with the heating element. Within the containment space, microwaves radiate downwards through radiation ports arranged opposite to the heating element, directly irradiating the waste plastic to be decomposed. The microwaves then penetrate the waste plastic and are absorbed by the heating element. The vacuum pump operates before microwave radiation reaches the containment space to reduce the amount of oxygen within the containment space. The nitrogen purging mechanism operates after the vacuum pump starts and before microwave radiation reaches the containment space, to further reduce the amount of oxygen in the containment space. The nitrogen purging mechanism operates further after the thermal decomposition of the waste plastic to be decomposed is completed, in order to cool the heated thermal decomposition furnace. The pipeline structure includes an inlet downstream pipe for supplying pyrolysis gas flowing into the pyrolysis oil storage section and extending upward from the pyrolysis oil storage section, and an outlet pipe for supplying pyrolysis gas discharging from the pyrolysis oil storage section and extending upward from the pyrolysis oil storage section. The gas condensation mechanism includes a gas condensation pipe for the flow of cooling fluid and disposed within the pipeline channel. The gas condenser pipes are respectively installed in the downstream pipe of the inlet section and the outlet pipe. Thermolytic oil is generated from the pyrolytic gas discharged from the pyrolytic storage unit through the gas condenser pipe installed in the discharge section and stored in the pyrolytic oil storage unit.

19. A waste plastic processing device, comprising: The waste plastic pyrolysis device uses microwaves as an energy source to pyrolyze waste plastics to generate pyrolysis gas. A piping structure that provides a conduit for the pyrolysis gas to be discharged and flow from the waste plastic pyrolysis device; A gas condensation mechanism condenses the pyrolysis gas to generate pyrolysis oil; and Thermolytic oil storage section, which stores the pyrolytic oil, The waste plastic pyrolysis device includes a pyrolysis furnace with an internal space for accommodating the waste plastic to be pyrolyzed, a microwave supply unit that generates microwaves and supplies them to the space, and a heating element that absorbs microwaves to generate heat. The heating element is plate-shaped and horizontally arranged in the receiving space, with the waste plastic to be decomposed in direct contact with the heating element. The gas condensation mechanism is disposed in at least a portion of the pipeline channel, and the pyrolysis gas generates pyrolysis oil as it flows through the pipeline channel. The gas condensation mechanism includes a gas condensation pipe for the flow of cooling fluid. The gas condenser is installed inside the pipeline channel. The pyrolysis oil storage unit comprises: a pyrolysis oil storage tank with an internal storage space for storing pyrolysis oil and an inlet for gas inflow and an outlet for gas discharge; and an additional pyrolysis oil storage tank with an internal additional storage space for storing pyrolysis oil and an additional inlet for gas inflow and an additional outlet for gas discharge. The piping structure includes an inflow pipe extending upward from the inlet, an outflow pipe extending upward from the outlet, an additional inflow pipe extending upward from the additional inlet and communicating with the outflow pipe, and an additional outflow pipe extending upward from the additional outlet. The pyrolysis gases are discharged from the pyrolysis oil storage section through the additional discharge pipe. The gas condenser pipes are respectively installed in the inflow pipe, the discharge pipe, the additional inflow pipe, and the additional discharge pipe. Thermolytic oil is generated from the pyrolytic gas discharged from the pyrolytic oil storage section and stored in the additional pyrolytic oil storage tank via the condenser pipe provided in the additional discharge pipe.

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