A continuous low-value waste plastic pyrolysis isolation incineration purification system

Abstract

This utility model discloses a continuous low-value waste plastic pyrolysis isolation incineration purification system, including a controller, and a feeding mechanism, a furnace body, and a flue gas cooling and purification system connected to the controller. The furnace body is equipped with an isolation hood that divides the furnace cavity into an independent pyrolysis chamber and a pyrolysis combustion chamber. The input end of the flue gas cooling and purification system is connected to the pyrolysis combustion chamber, and the feeding mechanism is connected to the pyrolysis chamber. An oil outlet mechanism is located at the lower end of the furnace body and is connected to the pyrolysis chamber. An ejector mechanism is located on the furnace body, with its input end connected to the pyrolysis chamber and its output end connected to the pyrolysis combustion chamber. This utility model divides the furnace body into a pyrolysis chamber and a pyrolysis combustion chamber through the isolation hood. Pyrolysis is carried out under anaerobic or hypoxic conditions, inhibiting the formation of harmful substances such as dioxins. The combustible gas produced by pyrolysis is heated by high-temperature combustion in the pyrolysis combustion chamber, improving energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of solid waste resource utilization and environmental protection technology, specifically to a continuous low-value waste plastic pyrolysis isolation incineration purification system. Background Technology

[0002] With rapid urbanization, the total amount of household waste has surged, with low-value waste plastics (such as plastic bags and packaging films) accounting for over 65%. These plastics are difficult to process using traditional physical recycling methods due to their low value, difficulty in sorting, and susceptibility to pollution, currently relying mainly on landfill or incineration. Landfilling not only occupies a large amount of land but also pollutes soil and groundwater; while direct incineration, especially of chlorinated plastics such as PVC commonly found in low-value waste plastics, easily generates dioxins, a potent carcinogen, during combustion, causing severe secondary air pollution, and is also extremely costly.

[0003] Studies have shown that pyrolysis technology can improve the dechlorination rate of low-value plastics, thereby reducing the generation of harmful substances such as dioxins. Pyrolysis technology utilizes the thermal instability of low-value waste plastics, heating them at high temperatures under anaerobic or oxygen-deficient conditions. The heat energy breaks the chemical bonds of the compounds, converting high-molecular-weight organic matter into low-molecular-weight combustible gases, liquid fuels, and coke. The gases produced after pyrolysis can be used as fuel, and the liquid (pyrolysis oil) can be sent to oil refineries for further processing.

[0004] Existing small-scale pyrolysis devices attempt to address this problem, but they generally suffer from limited processing capacity, inability to operate continuously, high energy consumption, and difficulty in fully utilizing the combustible gas produced by pyrolysis, resulting in the release of some harmful gases into the atmosphere and causing secondary pollution. Therefore, the market urgently needs a low-value waste plastic pyrolysis technology and equipment that can achieve continuous and stable production, effectively control pollutants, and simultaneously realize the high-value utilization of the products. Utility Model Content

[0005] To address some or all of the problems existing in the prior art, this utility model provides a continuous low-value waste plastic pyrolysis isolation incineration purification system, including a controller, and a feeding mechanism, a furnace body, and a flue gas cooling and purification system respectively connected to the controller. The furnace body is equipped with an isolation hood that divides the furnace body's inner cavity into an independent pyrolysis chamber and a pyrolysis combustion chamber. The input end of the flue gas cooling and purification system is connected to the pyrolysis combustion chamber. The feeding mechanism is connected to the pyrolysis chamber. An oil outlet mechanism is provided at the lower end of the furnace body and is connected to the pyrolysis chamber. A burner is provided on the outside of the furnace body, and the output end of the burner is connected to the pyrolysis combustion chamber. An ejector mechanism is provided on the furnace body, with its input end connected to the pyrolysis chamber and its output end connected to the pyrolysis combustion chamber.

[0006] As a further improvement of this utility model, the pyrolysis chamber is provided with a drying gasification chamber, a solid-gas separation plate, a pyrolysis gasification chamber, a solid-liquid separation plate and a liquid retention chamber in sequence from top to bottom. The solid-gas separation plate and the solid-liquid separation plate are respectively inclinedly arranged in the pyrolysis chamber. A gap is reserved between the solid-gas separation plate and the side wall of the isolation cover. The solid-liquid separation plate is sealed to the isolation cover. Oil leakage holes are evenly distributed on the solid-liquid separation plate.

[0007] As a further improvement of this utility model, the ejector mechanism includes an ejector machine, which is connected to the furnace body. The input end of the ejector machine is connected to the drying gasification chamber through a pipeline, and the output end of the ejector machine is connected to the pyrolysis combustion chamber through a pipeline.

[0008] As a further improvement of this utility model, the furnace body is provided with an oxygen-enriching device, which includes a plasma oxygen supply machine. The plasma oxygen supply machine is fixed on the outside of the furnace body, and the output end of the plasma oxygen supply machine is connected to the pyrolysis combustion chamber. The plasma oxygen supply machine is used to inject oxygen-enriched air into the pyrolysis combustion chamber.

[0009] As a further improvement of this utility model, a first gas chamber and a second gas chamber are respectively provided on the inner sidewalls of the furnace body. The first gas chamber is connected to the output end of the ejector, and the second gas chamber is connected to the output end of the plasma oxygen supply machine. Gas outlet pipes are evenly distributed on the first gas chamber and the second gas chamber, and the gas outlet pipes are connected to the pyrolysis combustion chamber.

[0010] As a further improvement of this utility model, the oil outlet mechanism includes an oil outlet motor and an oil outlet pipe. The oil outlet motor and the oil outlet pipe are respectively connected to the furnace body. One end of the oil outlet pipe is connected to the liquid retention chamber, and the other end is provided with an oil outlet hole. A rotatable shaft is provided inside the oil outlet pipe. The shaft is connected to the output end of the oil outlet motor. The shaft is provided with a spiral oil extraction blade. The oil outlet motor can drive the shaft to rotate.

[0011] As a further improvement of this utility model, a first temperature sensor is provided in the drying gasification chamber, a second temperature sensor and a first camera are provided in the pyrolysis gasification chamber, a third temperature sensor and a second camera are provided in the liquid retention chamber, and a fourth temperature sensor is provided in the pyrolysis combustion chamber. The first temperature sensor, the second temperature sensor, the first camera, the third temperature sensor, the second camera and the fourth temperature sensor are electrically connected to the controller.

[0012] As a further improvement of this utility model, the furnace body is provided with a solid waste discharge outlet and a shielding door mechanism. The solid waste discharge outlet is connected to the pyrolysis gasification chamber, and the shielding door mechanism is used to open or block the solid waste discharge outlet.

[0013] As a further improvement of this utility model, the shielding door mechanism includes a shielding motor and a shielding door. The shielding motor is connected to the furnace body, one end of the shielding door is hinged to the furnace body, and the shielding door is connected to the output end of the shielding motor. The shielding motor can drive the shielding door to rotate and swing on the furnace body.

[0014] As a further improvement of this utility model, the upper end of the furnace body is provided with a flue pipe, one end of which is connected to the flue gas cooling and purification system, and the other end is connected to the pyrolysis combustion chamber; the pyrolysis combustion chamber is provided with an energy reflector plate, which is sealed to the inner side wall of the furnace body, and the energy reflector plate has smoke passage holes evenly distributed on it.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model divides the furnace body into a pyrolysis chamber and a pyrolysis combustion chamber using an isolation cover. The pyrolysis process is carried out under anaerobic or hypoxic conditions, effectively inhibiting the formation of harmful substances such as dioxins. The pyrolysis combustion chamber is specifically designed to handle the combustible gases generated by pyrolysis, further decomposing residual pollutants through high-temperature combustion; at the same time, the heat generated by combustion can also heat the pyrolysis chamber, improving energy utilization and reducing energy consumption.

[0016] 2. This utility model achieves continuous feeding, pyrolysis and oil extraction of low-value plastics through the coordinated work of the feeding mechanism, pyrolysis chamber and oil extraction mechanism, which improves processing efficiency and production capacity and realizes the transformation from "white pollution" to "urban oil field". Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model; Figure 2 This is a top view of an embodiment of the present invention. Figure 3 This is a schematic diagram of the furnace body in an embodiment of this utility model; Figure 4 This is a schematic diagram of the internal structure of the furnace body in an embodiment of this utility model; Figure 5 This is a schematic diagram of the internal structure of the furnace body from another perspective in an embodiment of this utility model. Detailed Implementation

[0019] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0020] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figure 1-5 As shown, a continuous low-value waste plastic pyrolysis isolation incineration purification system includes a controller 1, and a feeding mechanism 2, a furnace body 3, and a flue gas cooling and purification system 4, all connected to the controller 1. The controller 1 includes a control box, in which a control circuit board is fixedly installed. The control box is equipped with multiple debugging control buttons. The control circuit board integrates a control system (such as a programmable PLC system). By operating the adjustment control buttons, the continuous low-value waste plastic pyrolysis isolation incineration purification system can be debugged or controlled. The continuous low-value waste plastic pyrolysis isolation incineration purification system can be powered by an external power supply connected to the control box.

[0023] The furnace body 3 is made of high-temperature resistant metal plate, and the furnace body 3 is equipped with an insulation layer 31. By setting the insulation layer 31, heat loss during operation can be reduced, and the risk of burns to operators caused by excessively high temperature of the outer wall of the furnace body 3 can be avoided, thus improving the safety of operation.

[0024] The furnace body 3 is equipped with an isolation cover 32, which is welded from high-temperature resistant steel plate. The isolation cover 32 divides the inner cavity of the furnace body 3 into an independent pyrolysis chamber and a pyrolysis combustion chamber 33. The pyrolysis chamber is used to complete the pyrolysis reaction of low-value plastics, which can pyrolyze low-value plastics into solid waste residue and pyrolysis oil; the pyrolysis combustion chamber 33 is used to burn the combustible gas generated by pyrolysis at high temperature, which provides the heat required for pyrolysis on the one hand, and completely decomposes harmful substances on the other hand.

[0025] The input end of the flue gas cooling and purification system 4 is connected to the pyrolysis combustion chamber 33, which is used to purify the flue gas generated by pyrolysis combustion so that it meets environmental emission requirements before being discharged into the atmosphere. The feeding mechanism 2 is connected to the pyrolysis chamber and is used to feed the crushed low-value plastics into the pyrolysis chamber. The lower end of the furnace body 3 is provided with an oil outlet mechanism 5, which is connected to the pyrolysis chamber; the oil outlet mechanism 5 collects the pyrolysis oil generated in the pyrolysis chamber and sends it out of the furnace body 3 for storage.

[0026] The furnace body 3 is also equipped with an ejector mechanism 6. The input end of the ejector mechanism 6 is connected to the pyrolysis chamber, and the output end of the ejector mechanism 6 is connected to the pyrolysis combustion chamber 33. The ejector mechanism 6 is used to extract the gas produced by pyrolysis in the pyrolysis chamber into the pyrolysis combustion chamber 33 for combustion. It should be noted that during the oxygen-deficient high-temperature pyrolysis of low-value plastics, some components in the plastic will be pyrolyzed into gases. Some of these gases are combustible. The gases produced by pyrolysis can be extracted into the pyrolysis combustion chamber 33 and used as fuel. At the same time, some harmful substances in the gases will be converted into harmless gases in the oxygen-rich high-temperature environment of the pyrolysis combustion chamber 33, achieving a preliminary purification effect.

[0027] The feeding mechanism 2 can be any existing type, which will not be described in detail in this utility model. The upper end of the furnace body 3 is provided with a feeding port, and a sealing cover 7 is provided on the feeding port. A feeding port opening and closing mechanism 8 is installed on the furnace body 3, and the output end of the feeding port opening and closing mechanism 8 is connected to the sealing cover 7. The feeding port opening and closing mechanism 8 can drive the sealing cover 7 to open or close the feeding port. When feeding is required, the feeding port opening and closing mechanism 8 drives the sealing cover 7 to open the feeding port, and then the feeding mechanism 2 pours the crushed low-value plastic into the feeding port of the furnace body 3, thereby achieving automatic feeding. After feeding is completed, the feeding port opening and closing mechanism 8 drives the sealing cover 7 to close the feeding port, so that the furnace body 3 forms a sealed space.

[0028] The pyrolysis chamber is arranged from top to bottom as follows: a drying and gasification chamber 34, a solid-gas separation plate 35, a pyrolysis and gasification chamber 36, a solid-liquid separation plate 37, and a liquid retention chamber 38. The solid-gas separation plate 35 and the solid-liquid separation plate 37 are respectively inclinedly arranged in the pyrolysis chamber. The solid-gas separation plate 35 is made of high-temperature resistant steel plate and is fixedly installed in the pyrolysis chamber. A gap is reserved between the solid-gas separation plate 35 and the inner wall of the isolation cover 32. During operation, the low-value plastics fall onto the solid-gas separation plate 35 after high-temperature pyrolysis in the drying and gasification chamber 34. The pyrolysis gas rises and is drawn into the pyrolysis combustion chamber 33 for combustion through the ejector mechanism 6. The softened gas falls into the pyrolysis and gasification chamber 36 from the gap around the solid-gas separation plate 35 for further pyrolysis and gasification. The solid-liquid separation plate 37 is made of high-temperature resistant steel plate. It is fixedly installed on the inner wall of the isolation cover 32 and sealed to it. Oil leakage holes 371 are evenly distributed on the solid-liquid separation plate 37. During operation, the high temperature of the pyrolysis gasification chamber 36 vaporizes and liquefies the softened material. The liquid falls into the liquid retention chamber 38 through the oil leakage holes 371. Unliquefied solids remain temporarily on the solid-liquid separation plate 37. When a certain quantity is reached, the solids are discharged from the furnace body 3 through the solid waste discharge port on the furnace body 3. When the pyrolysis oil in the liquid retention chamber 38 reaches a certain quantity, it can be sent out of the furnace body 3 through the oil discharge mechanism 5.

[0029] The oil discharge mechanism 5 includes an oil discharge motor 51 and an oil discharge pipe 52. The oil discharge motor 51 and the oil discharge pipe 52 are fixedly connected to the furnace body 3. One end of the oil discharge pipe 52 is connected to the liquid retention chamber 38, and the other end of the oil discharge pipe 52 is provided with an oil discharge hole 53. A rotatable shaft 54 ​​is provided inside the oil discharge pipe 52. The shaft 54 ​​is connected to the output end of the oil discharge motor 51, and a spiral oil extraction blade 55 is installed on the shaft 54. The oil discharge motor 51 can drive the shaft 54 ​​to rotate. When oil discharge is required, by controlling the operation of the oil discharge motor 51, the shaft 54 ​​is driven to rotate the spiral oil extraction blade 55, and the pyrolysis oil in the liquid retention chamber 38 is continuously pushed out from the oil discharge hole 53 to achieve continuous or intermittent oil discharge.

[0030] To allow the solid waste residue remaining on the solid-liquid separation plate 37 to be discharged from the furnace body 3, a solid waste discharge outlet and a shielding door mechanism 9 are provided on the furnace body 3. The solid waste discharge outlet is connected to the pyrolysis gasification chamber 36, and the shielding door mechanism 9 is used to open or close the solid waste discharge outlet. Specifically, the shielding door mechanism 9 includes a shielding motor 91 and a shielding door 92. One end of the shielding door 92 is hinged to the furnace body 3. The shielding motor 91 can drive the shielding door 92 to rotate around the hinge point, thereby opening or closing the solid waste discharge outlet, making the operation safe and convenient. Under normal circumstances, the shielding door 92 blocks the solid waste discharge outlet, creating a sealed space inside the furnace body 3. When a large amount of solid waste residue remains on the solid-liquid separation plate 37, the shielding motor 91 drives the shielding door 92 to rotate and swing, causing the shielding door 92 to open the solid waste discharge outlet. After the solid waste discharge outlet is opened, the solid waste residue remaining on the solid-liquid separation plate 37 will fall out of the solid waste discharge outlet under its own gravity, thus achieving the function of discharging waste residue. After the solid waste residue is discharged, the shielding motor 91 drives the shielding door 92 to rotate and swing in the opposite direction, so that the shielding door 92 re-seals the solid waste discharge outlet.

[0031] The ejector mechanism 6 includes an ejector 61, which is fixedly installed on the outside of the furnace body 3. The input end of the ejector 61 is connected to the drying gasification chamber 34 through a pipeline, and the output end of the ejector 61 is connected to the pyrolysis combustion chamber 33 through a pipeline. In actual operation, the ejector 61 can actively extract the pyrolysis gas in the drying gasification chamber 34 and transport it to the pyrolysis combustion chamber 33 for combustion.

[0032] To optimize combustion conditions within the pyrolysis combustion chamber 33, an oxygen-enriching device is also installed. This device includes a plasma oxygen supply unit 10, which is fixedly installed on the outside of the furnace body 3. Any existing type of plasma oxygen supply unit can be used. It generates oxygen-rich air, and its outlet is connected to the pyrolysis combustion chamber 33. By injecting oxygen-enriched air into the pyrolysis combustion chamber 33 through the plasma oxygen supply unit 10, the combustion efficiency is improved, combustion is more complete, and the generation of harmful gases is reduced.

[0033] To ensure uniform combustion within the pyrolysis combustion chamber 33, a first gas chamber 11 and a second gas chamber 12 are respectively provided on the inner sidewalls of the furnace body 3. The first gas chamber 11 is connected to the output end of the ejector 61, and the second gas chamber 12 is connected to the output end of the plasma oxygen supply unit 10. Gas outlet pipes 13 are evenly distributed on both the first and second gas chambers 11 and 12, and these outlet pipes 13 are connected to the pyrolysis combustion chamber 33. When the ejector 61 operates, it extracts the pyrolysis gas and transports it to the first gas chamber 11, then distributes the gas evenly into various areas of the pyrolysis combustion chamber 33 through the outlet pipes 13 distributed on the first gas chamber 11. Similarly, when the plasma oxygen supply unit 10 operates, it injects oxygen-enriched air into the second gas chamber 12, then distributes the oxygen-enriched air evenly into various areas of the pyrolysis combustion chamber 33 through the outlet pipes 13 on the second gas chamber 12, resulting in more uniform combustion.

[0034] To ensure more complete combustion, an energy reflector plate 14 is installed inside the furnace body 3. The energy reflector plate 14 is positioned opposite the pyrolysis combustion chamber 33 and the drying gasification chamber 34 within the furnace body 3. The energy reflector plate 14 is sealed to the inner wall of the furnace body 3 and has multiple smoke passage holes 141 for flue gas to pass through. The energy reflector plate 14 can maintain the temperature inside the furnace body 3, reducing heat loss. During operation, light flue gas passes through the smoke passage holes 141 on the energy reflector plate 14 and is then discharged from the furnace body 3 through the exhaust pipe 21. Heavy dust is blocked and falls into the pyrolysis combustion chamber 33 for further combustion, increasing the residence time of heavy dust within the furnace and further decomposing harmful substances in the flue gas. Simultaneously, when the heat (infrared rays) generated during combustion shines upwards onto the energy reflector plate 14, the energy reflector plate 14 reflects it downwards, reducing heat loss and maintaining the temperature inside the furnace.

[0035] To achieve intelligent control, a first temperature sensor 15 is installed in the drying gasification chamber 34; a second temperature sensor 16 and a first camera 17 are installed in the pyrolysis gasification chamber 36; a third temperature sensor 18 and a second camera 19 are installed in the liquid retention chamber 38; and a fourth temperature sensor 20 is installed in the pyrolysis combustion chamber 33. All these sensors and cameras are electrically connected to the controller 1. Based on the received temperature and image information, the controller 1 can automatically adjust operations such as feeding speed, ejector air volume, oxygenation, oil output, and slag discharge to ensure that the entire system operates under optimal conditions.

[0036] The upper end of the furnace body 3 is provided with a flue pipe 21. One end of the flue pipe 21 is connected to the flue gas cooling and purification system 4, and the other end is connected to the pyrolysis combustion chamber 33. The flue gas generated by the pyrolysis combustion chamber 33 will be discharged from the furnace body 3 through the flue pipe 21, and then purified by the flue gas cooling and purification system 4 before being discharged into the atmosphere.

[0037] Specifically, the flue gas cooling and purification system 4 includes a spray cooling component 41, a water purification component 42, and an electrostatic purification component 43 connected in sequence. The electrostatic purification component 43 is provided with an exhaust port 44, which is used to discharge the cooled and purified flue gas. The spray cooling component 41 is used to cool the flue gas, the water purification component 42 is used to purify the flue gas with water, and the electrostatic purification component 43 is used to purify the flue gas with electrostatic electricity.

[0038] During operation, the flue gas generated in the pyrolysis combustion chamber 33 is discharged into the spray cooling component 41 through the exhaust pipe 21. The spray cooling component 41 cools the flue gas and also performs the first purification. The cooled flue gas flows into the water purification component 42 for a second purification. Then, the flue gas flows into the electrostatic purification component 43 for a third purification. After three layers of purification, the flue gas is discharged from the exhaust port 44. The three layers of purification can eliminate particulate matter and dust in the flue gas, so that the discharged flue gas meets environmental protection standards and is at a suitable temperature.

[0039] It should be noted that in the initial stage of equipment operation, the temperatures in the pyrolysis combustion chamber 33 and the pyrolysis chamber are insufficient. Therefore, an external heat source is needed to heat the equipment during the initial startup phase to ensure that the temperatures in the pyrolysis combustion chamber 33 and the pyrolysis chamber meet the operational requirements. In this embodiment, a burner 22 is installed on the outer wall of the furnace body 3. The burner 22 can be a hydrogen burner or any existing type. The burner 22 is electrically connected to the control box, and its output terminal is connected to the pyrolysis combustion chamber 33. In the initial stage of equipment startup, the burner 22 is controlled to heat the pyrolysis combustion chamber 33 and the pyrolysis chamber. As the working time increases, the temperature inside the pyrolysis combustion chamber 33 also rises. When the temperature inside the pyrolysis combustion chamber 33 reaches a certain value, low-value plastic is fed into the pyrolysis chamber through the feed inlet, and the equipment pyrolyzes the low-value plastic. The ejector 61 is controlled to deliver the gas generated in the pyrolysis chamber to the pyrolysis combustion chamber 33 for combustion, causing the temperature inside the pyrolysis combustion chamber 33 to continue to rise. When the temperature inside the pyrolysis combustion chamber 33 rises to the pre-determined temperature value, the burner 22 is controlled to stop working, and the energy for the equipment can then be self-sufficient.

[0040] Working principle: First, the sealing cover 7 is opened through the inlet opening and closing mechanism 8, and then the feeding mechanism 2 feeds the crushed low-value plastic into the pyrolysis chamber through the inlet. After completion, the sealing cover 7 is closed, creating a sealed, oxygen-deficient environment inside the furnace body 3, thus creating conditions for the pyrolysis reaction.

[0041] Low-value plastics fed into the pyrolysis chamber are first heated in the drying and gasification chamber 34, where moisture evaporates and preliminary pyrolysis begins, with some components converting into gas. The gas produced by pyrolysis rises, while the softened or semi-coked material falls onto the inclined solid-gas separation plate 35. The gas is drawn away by the ejector mechanism 6, while the solid material falls from the gap between the separation plate and the furnace wall into the lower pyrolysis and gasification chamber 36. After falling into the pyrolysis and gasification chamber 36, the material undergoes higher temperatures, deeper pyrolysis, and gasification, with most of it converting into an oil-gas mixture. The resulting liquid pyrolysis oil drips through the oil leakage hole 371 on the solid-liquid separation plate 37 into the lowest liquid retention chamber 38 for temporary storage; the unliquefied solid residue (waste residue) remains temporarily on the solid-liquid separation plate 37. When the pyrolysis oil in the liquid retention chamber 38 reaches a certain amount, the controller 1 starts the oil outlet motor 51, driving the spiral oil extraction blades 55 to rotate, continuously or intermittently discharging the pyrolysis oil out of the furnace for collection through the oil outlet pipe 52. When the solid waste on the solid-liquid separation plate 37 accumulates to a certain amount, the controller 1 activates the shielding door mechanism 9 to open the solid waste discharge outlet, and the waste is automatically discharged under the action of gravity.

[0042] Simultaneously, the ejector 61 continues to operate, extracting the gas generated in the pyrolysis chamber and transporting it to the pyrolysis combustion chamber 33. The plasma oxygen supply unit 10 injects oxygen-enriched air into the pyrolysis combustion chamber 33 to optimize combustion conditions. Combustible gas and oxygen-enriched air are evenly distributed into various areas of the pyrolysis combustion chamber 33 through the first gas chamber 11, the second gas chamber 12, and their respective outlet pipes 13, ensuring complete and uniform combustion. The combustible gas is ignited within the pyrolysis combustion chamber 33, and the high temperature generated provides the continuous heat required for the entire pyrolysis process, achieving energy self-sufficiency. Simultaneously, the high-temperature combustion completely decomposes any potentially harmful substances contained in the gas. The high-temperature flue gas generated by pyrolysis combustion passes through the smoke holes 141 of the energy reflector 14 and enters the flue gas cooling and purification system 4 through the exhaust pipe 21. This system sequentially undergoes three stages of treatment: spray cooling, water purification, and electrostatic purification, effectively removing particulate matter and harmful components, ultimately releasing low-temperature clean flue gas that meets environmental standards into the atmosphere.

[0043] This continuous low-value waste plastic pyrolysis isolation incineration purification system integrates pyrolysis, combustion, purification and intelligent control through innovative structural design. It not only achieves efficient, continuous and resource-based treatment of low-value plastics, but also controls the generation and emission of pollutants from both the source and the end, resulting in extremely high environmental and economic benefits.

[0044] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A continuous low-value waste plastic pyrolysis isolation incineration purification system, characterized in that: The system includes a controller, a feeding mechanism, a furnace body, and a flue gas cooling and purification system, all connected to the controller. The furnace body is equipped with an isolation hood that divides the inner cavity of the furnace body into an independent pyrolysis chamber and a pyrolysis combustion chamber. The input end of the flue gas cooling and purification system is connected to the pyrolysis combustion chamber. The feeding mechanism is connected to the pyrolysis chamber. An oil outlet mechanism is provided at the lower end of the furnace body and is connected to the pyrolysis chamber. A burner is provided on the outer side of the furnace body, and the output end of the burner is connected to the pyrolysis combustion chamber. The furnace body is equipped with an ejector mechanism, the input end of which is connected to the pyrolysis chamber, and the output end of which is connected to the pyrolysis combustion chamber.

2. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 1, characterized in that: The pyrolysis chamber is provided with a drying and vaporization chamber, a solid-gas separation plate, a pyrolysis and vaporization chamber, a solid-liquid separation plate, and a liquid retention chamber in sequence from top to bottom. The solid-gas separation plate and the solid-liquid separation plate are respectively inclinedly arranged in the pyrolysis chamber. A gap is reserved between the solid-gas separation plate and the side wall of the isolation cover. The solid-liquid separation plate is sealed to the isolation cover. Oil leakage holes are evenly distributed on the solid-liquid separation plate.

3. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 2, characterized in that: The ejector mechanism includes an ejector machine, which is connected to the furnace body. The input end of the ejector machine is connected to the drying and gasification chamber via a pipeline, and the output end of the ejector machine is connected to the pyrolysis combustion chamber via a pipeline.

4. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 3, characterized in that: The furnace body is equipped with an oxygen-enriching device, which includes a plasma oxygen supply machine. The plasma oxygen supply machine is fixed on the outside of the furnace body, and its output end is connected to the pyrolysis combustion chamber. The plasma oxygen supply machine is used to inject oxygen-enriched air into the pyrolysis combustion chamber.

5. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 4, characterized in that: The furnace body has a first gas chamber and a second gas chamber respectively on its four inner side walls. The first gas chamber is connected to the output end of the ejector, and the second gas chamber is connected to the output end of the plasma oxygen supply machine. Gas outlet pipes are evenly distributed on the first and second gas chambers and are connected to the pyrolysis combustion chamber.

6. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 2, characterized in that: The oil outlet mechanism includes an oil outlet motor and an oil outlet pipe, which are respectively connected to the furnace body. One end of the oil outlet pipe is connected to the liquid retention chamber, and the other end is provided with an oil outlet hole. A rotatable shaft is provided inside the oil outlet pipe. The shaft is connected to the output end of the oil outlet motor. The shaft is provided with a spiral oil extraction blade. The oil outlet motor can drive the shaft to rotate.

7. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 2, characterized in that: The drying gasification chamber is equipped with a first temperature sensor, the pyrolysis gasification chamber is equipped with a second temperature sensor and a first camera, the liquid retention chamber is equipped with a third temperature sensor and a second camera, and the pyrolysis combustion chamber is equipped with a fourth temperature sensor. The first temperature sensor, the second temperature sensor, the first camera, the third temperature sensor, the second camera, and the fourth temperature sensor are electrically connected to the controller.

8. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 2, characterized in that: The furnace body is equipped with a solid waste discharge outlet and a shielding door mechanism. The solid waste discharge outlet is connected to the pyrolysis gasification chamber, and the shielding door mechanism is used to open or block the solid waste discharge outlet.

9. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to claim 8, characterized in that: The shielding door mechanism includes a shielding motor and a shielding door. The shielding motor is connected to the furnace body, one end of the shielding door is hinged to the furnace body, and the shielding door is connected to the output end of the shielding motor. The shielding motor can drive the shielding door to rotate and swing on the furnace body.

10. The continuous low-value waste plastic pyrolysis isolation incineration purification system according to any one of claims 1-9, characterized in that: The upper end of the furnace body is provided with a flue pipe, one end of which is connected to the flue gas cooling and purification system, and the other end is connected to the pyrolysis combustion chamber. An energy reflector is provided inside the pyrolysis combustion chamber. The energy reflector is sealed to the inner wall of the furnace body, and smoke holes are evenly distributed on the energy reflector.

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