An industrial waste plastic pyrolysis oil device and method without smoke emission
By indirectly heating and recycling the high-temperature carbon dioxide flue gas generated by pure oxygen combustion, the problems of low heat transfer efficiency and flue gas emission pollution in the industrial waste plastic pyrolysis process are solved, realizing an efficient and environmentally friendly plastic pyrolysis oil production process that meets the national emission reduction and energy conservation goals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING KAIMINGYANG ENERGY ENG CO
- Filing Date
- 2026-03-27
- Publication Date
- 2026-05-29
AI Technical Summary
Existing industrial waste plastic treatment methods suffer from problems such as low heat transfer efficiency, high energy consumption, and serious pollution from flue gas emissions. In particular, the toxic and harmful gases such as carbon dioxide and dioxins generated during the pyrolysis process, as well as the high-cost secondary pollution control challenges, present significant challenges.
The high-temperature carbon dioxide flue gas generated by the combustion of pure oxygen is used for indirect heating, which is then recycled and waste heat is recovered. The high-temperature carbon dioxide flue gas generated by the combustion of oxygen and pyrolysis gas in the heat source furnace provides a stable and efficient heat source for the pyrolysis furnace. Air is strictly isolated from the furnace to ensure that the pyrolysis process is carried out in an airless environment.
It improves thermal energy utilization, reduces fuel consumption and flue gas emissions, achieves near-zero carbon dioxide emissions, meets national emission reduction and energy conservation targets, extends equipment life and reduces operating costs.
Smart Images
Figure CN122104270A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of plastic pyrolysis technology, specifically relating to an industrial waste plastic pyrolysis oil production device and method with zero smoke emission. Background Technology
[0002] Industrial waste plastic disposal has become a prominent issue hindering high-quality development and threatening ecological security and public health. Currently, with the acceleration of industrialization and the expansion of the consumer market, the amount of industrial waste plastic generated is showing a rigid growth trend. Every year, a large amount of industrial waste plastic generates a large amount of flue gas emissions during the chemical recycling process, causing environmental pollution.
[0003] Currently, the treatment of industrial waste plastics mainly refers to pyrolysis and gasification processes, but they face a series of significant technical and engineering drawbacks in commercialization: 1. Heat transfer efficiency and coking issues: Plastics are poor conductors of heat, and during the pyrolysis process, viscous intermediate substances and solid carbon are produced, which easily adhere to the inner wall of the pyrolysis furnace, the agitator, and the surface of the heat transfer tubes, resulting in a sharp decrease in heat transfer efficiency and an increase in energy consumption; 2. High cost of secondary pollution control: The pyrolysis process may produce toxic and harmful gases such as carbon dioxide, dioxins (especially in the presence of chlorinated plastics, if temperature control is not properly maintained), VOCs, PAHs, as well as wastewater containing oil and heavy metals.
[0004] Therefore, an industrial waste plastic pyrolysis oil production device and method with zero smoke emission are provided. Summary of the Invention
[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an industrial waste plastic pyrolysis oil production device and method with zero smoke emission.
[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for producing oil from industrial waste plastics through pyrolysis without smoke emissions, comprising the following contents: (I) Pure oxygen and cracked gas are burned in a heat source furnace to generate carbon dioxide gas that carries heat; (II) Carbon dioxide gas carrying heat is used to indirectly heat the plastic in the pyrolysis furnace, and the plastic is in an airless environment during pyrolysis. (III) A portion of the carbon dioxide gas after heat loss is recycled to the heat source furnace for secondary heating, and another portion of the carbon dioxide gas after heat loss is collected and utilized after flue gas purification and waste heat recovery. The gas generated by indirect heating and pyrolysis of plastics is separated and distilled to obtain pyrolysis gas for combustion.
[0007] This invention replaces the existing method of directly heating and pyrolyzing industrial waste plastics by burning pure oxygen to heat the flue gas. The high-temperature carbon dioxide flue gas generated by the combustion of oxygen and pyrolysis gas in the heat source furnace provides a stable and efficient heat source for the pyrolysis furnace. The radiative power of a flame is mainly determined by the content of triatomic gases in the flue gas. The flue gas produced by the combustion of oxygen and cracked gas contains only a high concentration of carbon dioxide triatomic gas. Triatomic gases have strong radiative heat transfer efficiency, and high-temperature carbon dioxide flue gas is used for indirect heating. Specifically, high-temperature carbon dioxide flue gas is indirectly heated and pyrolyzed in a pyrolysis furnace, strictly preventing air from entering, ensuring uniform heating without localized high-temperature zones, resulting in rapid pyrolysis, improved thermal energy utilization, and guaranteed safety and product quality during the pyrolysis process. High-temperature carbon dioxide flue gas is discharged from the pyrolysis furnace after indirect heat exchange with waste plastics in the pyrolysis furnace. Part of the carbon dioxide flue gas is purified and the waste heat is recovered and collected for reuse, while part of the carbon dioxide flue gas is circulated back to the heat source furnace for reheating. In this way, only a small amount of fuel is needed to raise the temperature of the circulating flue gas to the temperature required for heat exchange with the plastics. The flue gas produced by pure oxygen combustion is high-purity, high-temperature carbon dioxide gas. Besides recycling, the remaining high-purity carbon dioxide flue gas can be recovered and reused, truly achieving zero flue gas emissions. The carbon dioxide heat source furnace employs technologies such as pure oxygen-assisted combustion, flue gas recirculation, and waste heat recovery, achieving a thermal efficiency of over 99%, which is more energy-efficient than direct heating and solves the carbon dioxide emission problem at its source.
[0008] Secondly, the present invention provides an industrial waste plastic pyrolysis oil production device with zero smoke emission, for implementing the above-mentioned pyrolysis oil production method, including a pyrolysis furnace and a heat source furnace; The pyrolysis furnace is provided with an inner pyrolysis furnace chamber and an outer heating furnace chamber. The interior of the pyrolysis furnace chamber is a pyrolysis space, and the space between the pyrolysis furnace chamber and the heating furnace chamber is an indirect heating space. The pyrolysis furnace chamber is provided with a pyrolysis gas outlet and a heat preservation and heat equalization section, and the heating furnace chamber is provided with a hot flue gas inlet and a hot flue gas return outlet. The heat source furnace is equipped with an oxygen interface, a pyrolysis gas interface, a flue gas recirculation interface, and a hot flue gas outlet; The pyrolysis gas flowing out of the pyrolysis gas outlet is processed before entering the pyrolysis gas inlet; The hot flue gas outlet is connected to the hot flue gas inlet via pipe one, and the hot flue gas return outlet is connected to the flue gas return interface via pipe two. Pipe two is provided with a diversion port for sending the flue gas to be collected and utilized.
[0009] The pyrolysis furnace in this invention uses indirect heating to pyrolyze plastics. The pyrolysis furnace is equipped with a long heat-preserving and heat-equalizing section to ensure that industrial waste plastics can be fully and uniformly pyrolyzed into oil, gas and a small amount of carbon black in an oxygen-deficient environment. The heat source furnace uses pure oxygen combustion to heat the flue gas instead of the existing method of directly heating and cracking industrial waste plastics by air combustion. The high-temperature carbon dioxide flue gas generated by the combustion of oxygen and cracking gas in the heat source furnace provides a stable and efficient heat source for the cracking furnace. Pure oxygen combustion improves the heat transfer capacity of flame thermal radiation, shortens the flue gas heating time, and extends the service life of the cracking furnace. In terms of gas recycling, The high-temperature carbon dioxide flue gas produced by the combustion of oxygen and pyrolysis gas in the heat source furnace enters the indirect heating space between the pyrolysis furnace and the heating furnace through the hot flue gas outlet, pipe one, and hot flue gas inlet. This transfers heat to the pyrolysis furnace, creating an airless environment for the plastic inside, which then undergoes pyrolysis. The pyrolysis gas produced is treated and then fed back into the heat source furnace for combustion through the pyrolysis gas interface. Furthermore, the high-temperature carbon dioxide flue gas retains some heat after indirect heating, which can be reused. Therefore, after flowing out from the hot flue gas return outlet, the high-temperature carbon dioxide flue gas has two possible paths through pipe two. Specifically… One path is to reuse the flue gas in the heat source furnace through the flue gas recirculation interface. Since the flue gas itself carries heat, the temperature rises very quickly, which can shorten the heating time, reduce the consumption of cracked gas and oxygen, and reduce the heat loss of flue gas. Another approach is to send the waste heat through a diversion port for purification and recovery before collection and utilization, thus avoiding direct carbon dioxide emissions.
[0010] In some optional examples, safety shut-off valves are installed on the pipelines supplying oxygen, carbon dioxide flue gas, and pyrolysis gas. When the system pressure, temperature, or other parameters become abnormal, the safety shut-off valves can activate in a timely manner to cut off the gas supply and issue audible and visual alarms, thus preventing safety accidents and promptly notifying operators to handle the situation.
[0011] As a preferred embodiment of the present invention, the heat source furnace is further provided with an ignition mechanism. The ignition mechanism is a pure oxygen burner, which is equipped with an oxygen lance, a pyrolysis gas lance, an automatic ignition lance, and a flame detection structure. The oxygen lance is connected to an oxygen interface, and the oxygen supply comes from a utility air separation or pressure swing adsorption device. The oxygen pressure is below 1 MPa and the temperature is room temperature. The pyrolysis gas lance is connected to a pyrolysis gas interface, and the pyrolysis gas supply comes from a pyrolysis gas separation and treatment process. The pyrolysis gas pressure is below 1 MPa and the temperature is room temperature to 200°C. The flame detection structure determines whether ignition is successful.
[0012] As a preferred technical solution of the present invention, the pyrolysis oil production device further includes a feeding mechanism and a feed inlet connected to the feeding mechanism.
[0013] In this invention, the feed inlet is used to add the plastic to be pyrolyzed, and the pusher mechanism pushes the plastic into the pyrolysis furnace.
[0014] As a preferred technical solution of the present invention, the pyrolysis oil production device also includes a pyrolysis residue crushing and conveying mechanism.
[0015] In this invention, the pyrolysis residue crushing and conveying mechanism crushes the residue of the pyrolyzed plastic and then transports it to the external environment to avoid it accumulating in the pyrolysis furnace.
[0016] As a preferred technical solution of the present invention, the pyrolysis oil production device also includes a blower installed on the second path of the pipeline.
[0017] In this invention, a fan is used to provide power for the recirculating flue gas.
[0018] As a preferred embodiment of the present invention, the pyrolysis furnace is equipped with a maintenance furnace door.
[0019] In this invention, the maintenance furnace door is used to open the pyrolysis furnace, facilitating internal inspection and maintenance.
[0020] As a preferred technical solution of the present invention, the pyrolysis oil production device further includes a control unit, a temperature sensor, and a pressure sensor. The temperature sensor is a thermocouple, and multiple thermocouples are arranged to monitor the temperature inside the pyrolysis furnace, the temperature of the interlayer space between the pyrolysis furnace and the heating furnace, the temperature of the pyrolysis gas outlet, the temperature of the hot flue gas inlet, the temperature of the hot flue gas return outlet, and the temperature of the hot flue gas outlet. Thermocouples detect specific temperatures, thus providing information for temperature control. When the temperature is low, the temperature can be increased by increasing the fuel supply, and when the temperature is high, the temperature can be decreased by reducing the fuel supply. The pressure sensor monitors the pressure of the pyrolysis gas. When the pressure is too high or too low, an alarm signal is issued and the control unit controls the safety shut-off valve to close, cutting off the supply of pyrolysis gas, oxygen and carbon dioxide return flue gas. The valve is restarted after the fault is cleared. The control unit uses a programmable logic controller with a built-in control program to achieve automatic process control of plastic pyrolysis.
[0021] The beneficial effects of this invention are: 1. Replacing the existing method of directly heating and pyrolyzing industrial waste plastics with air combustion by heating flue gas with pure oxygen combustion provides a stable and efficient heat source for the pyrolysis furnace. Pure oxygen combustion can improve the heat transfer capacity of flame radiation, shorten the flue gas heating time, and extend the service life of the pyrolysis furnace. After pure oxygen combustion, the concentration and partial pressure of triatomic gases in the flame and flue gas are greatly increased. According to the gas radiation theory, only triatomic and polyatomic gases have strong radiation capacity, thus greatly improving the radiation capacity of the flue gas. In addition, pure oxygen combustion is a diffuse flameless combustion method. The effective high-temperature zone of the flame has sufficient rigidity and large volume. The flue gas is fully stirred and the temperature is uniform, which improves the radiation heat transfer efficiency and reduces the heat loss of flue gas emissions. 2. The generated carbon dioxide flue gas is recycled, significantly saving heating fuel. The heat source furnace uses pure oxygen as a combustion aid, and the flame generated by fuel combustion heats the flue gas drawn back into the heat source furnace by the fan. Among them, the fan draws 5% to 95% of the flue gas back into the heat source furnace for reheating and recycling. In this way, only a small amount of fuel is needed to raise the temperature of the circulating flue gas to the temperature required for heat exchange with the material. This can make full use of the heat of the flue gas, improve the heating uniformity and heating quality. Compared with direct pyrolysis with air support, this can reduce fuel consumption by more than 50%, shorten the heating time by more than 50%, has high thermal efficiency, improves production efficiency, and reduces the fuel cost of equipment operation. At the same time, the heat carried away by the flue gas is also greatly reduced, thus greatly reducing the heat loss of the flue gas and reducing fuel consumption. 3. The flue gas generated by pure oxygen combustion is composed of high-purity carbon dioxide, which greatly facilitates carbon dioxide capture and reuse, aligning with the national dual-carbon emission reduction and energy-saving goals proposed at this stage, and yielding significant social benefits. This invention, on the one hand, recycles carbon dioxide flue gas, and on the other hand, collects and utilizes carbon dioxide flue gas, which can achieve zero carbon dioxide emissions and plays a crucial role in achieving the carbon neutrality goal as soon as possible. Attached Figure Description
[0022] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a cross-sectional view of the pyrolysis furnace and the feeding mechanism according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the heat source furnace according to an embodiment of the present invention; The symbols for the main components are explained below: 1. Pyrolysis furnace; 11. Hot flue gas recirculation outlet; 12. Diversion port; 13. Pyrolysis gas outlet; 14. Pyrolysis residue crushing and conveying mechanism; 15. Pipeline 2; 161. Pyrolysis furnace chamber; 162. Heating furnace chamber; 17. Hot flue gas inlet; 18. Maintenance furnace door; 2. Heat source furnace; 21. Flue gas recirculation interface; 22. Oxygen interface; 23. Pyrolysis gas interface; 24. Ignition mechanism; 25. Hot flue gas outlet; 26. Pipeline 1; 3. Pushing mechanism; 31. Feed inlet. Detailed Implementation
[0023] The technical solutions of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary, and should not be construed as limiting the implementation methods or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein. Example
[0024] This embodiment provides a method for producing oil from industrial waste plastics through pyrolysis without smoke emissions, including the following: (I) Pure oxygen and cracked gas are burned in heat source furnace 2 to generate carbon dioxide gas carrying heat; (II) Carbon dioxide gas carrying heat is used to indirectly heat the plastic in the pyrolysis furnace 1, and the plastic is in an airless environment during the pyrolysis process. (III) A portion of the carbon dioxide gas after heat loss is recycled to the heat source furnace 2 for secondary heating, and another portion of the carbon dioxide gas after heat loss is collected and utilized after flue gas purification and waste heat recovery. Among them, the gas generated by indirect heating and pyrolysis of plastics is purified by separation and distillation to obtain pyrolysis gas for combustion; In actual production, the parameters for the above-mentioned heating and pyrolysis process are as follows: Process media pressure temperature source High-temperature flue gas containing carbon dioxide Below 1MPa 120--800°C Hot flue gas outlet of heat source furnace Carbon dioxide recirculation flue gas Below 1MPa 80--600°C Indirect heating pyrolysis furnace, flue gas after heat exchange pyrolysis gas Below 1MPa room temperature - 200°C Pyrolysis gas separation process oxygen Below 1MPa normal temperature Oxygen generation by air separation or pressure swing adsorption Heating furnace Below 1MPa 200-800°C Cracking furnace Below 1MPa 120-700°C In this embodiment, pure oxygen combustion is used to heat the flue gas instead of the existing method of directly heating and cracking industrial waste plastics by air combustion. The high-temperature carbon dioxide flue gas generated by the combustion of oxygen and cracked gas in the heat source furnace 2 provides a stable and efficient heat source for the cracking furnace 1. The radiative power of a flame is mainly determined by the content of triatomic gases in the flue gas. The flue gas produced by the combustion of oxygen and cracked gas contains only a high concentration of carbon dioxide triatomic gas. Triatomic gases have strong radiative heat transfer efficiency, and high-temperature carbon dioxide flue gas is used for indirect heating. Specifically, high-temperature carbon dioxide flue gas is indirectly heated and pyrolyzed in pyrolysis furnace 1, which strictly isolates air from entering, ensures uniform heating without local high-temperature zones, accelerates pyrolysis, improves thermal energy utilization, and guarantees the safety of the pyrolysis process and the quality of the product. High-temperature carbon dioxide flue gas is discharged from pyrolysis furnace 1 after indirect heat exchange with waste plastics in pyrolysis furnace 1. Part of the carbon dioxide flue gas is purified and the waste heat is recovered and collected for use. Part of the carbon dioxide flue gas is recycled back to the heat source furnace 2 for reheating. In this way, only a small amount of fuel is needed to raise the temperature of the circulating flue gas to the temperature required for heat exchange with plastics. The flue gas produced by pure oxygen combustion is high-purity, high-temperature carbon dioxide gas. Besides recycling, the remaining high-purity carbon dioxide flue gas can be recovered and reused, truly achieving zero flue gas emissions. The carbon dioxide heat source furnace 2 employs technologies such as pure oxygen-assisted combustion, flue gas recirculation, and waste heat recovery, achieving a thermal efficiency of over 99%, which is more energy-efficient than direct heating and solves the carbon dioxide emission problem at its source. Example
[0025] like Figure 1 , 2 As shown in Figures 1 and 3, this embodiment provides an industrial waste plastic pyrolysis oil production device with zero smoke emission, including a pyrolysis furnace 1, a heat source furnace 2, a feeding mechanism 3, and a feed inlet 31 connected to the feeding mechanism 3. The pyrolysis furnace 1 is provided with an inner pyrolysis furnace chamber 161 and an outer heating furnace chamber 162. The interior of the pyrolysis furnace chamber 161 is the pyrolysis space, and the space between the pyrolysis furnace chamber 161 and the heating furnace chamber 162 is the indirect heating space. The pyrolysis furnace chamber 161 is provided with a pyrolysis gas outlet 13 and a heat preservation and heat equalization section, and the heating furnace chamber 162 is provided with a hot flue gas inlet 17 and a hot flue gas return outlet 11. The heat source furnace 2 is equipped with an oxygen interface 22, a pyrolysis gas interface 23, a flue gas recirculation interface 21, a hot flue gas outlet 25, and an ignition mechanism 26. The pyrolysis gas flowing out of pyrolysis gas outlet 13 is processed and then enters pyrolysis gas inlet 23; The hot flue gas outlet 25 is connected to the hot flue gas inlet 17 via pipe 1 26, and the hot flue gas return outlet 11 is connected to the flue gas return interface 21 via pipe 2 15. Pipe 2 15 is provided with a diversion port 12 for sending the flue gas to collection and utilization, and a fan is installed along the path of pipe 2 15.
[0026] In this embodiment, plastic is fed into the pushing area of the pushing mechanism 3 through the feed inlet 31. The pushing mechanism 3 then feeds the plastic into the pyrolysis furnace 1. The pyrolysis furnace 1 uses indirect heating to heat and pyrolyze the plastic. The pyrolysis furnace 1 is equipped with a long heat preservation and heat equalization section to ensure that industrial waste plastic can be fully and uniformly pyrolyzed into oil and gas and a small amount of carbon black in an oxygen-deficient environment. Heat source furnace 2 uses pure oxygen combustion to heat the flue gas instead of the existing method of directly heating and cracking industrial waste plastics by air combustion. The high-temperature carbon dioxide flue gas generated by the combustion of oxygen and cracking gas in heat source furnace 2 provides a stable and efficient heat source for the cracking furnace. Pure oxygen combustion improves the heat transfer capacity of flame thermal radiation, shortens the flue gas heating time, and extends the service life of the cracking furnace. In terms of gas recycling, The high-temperature carbon dioxide flue gas produced by the combustion of oxygen and pyrolysis gas in heat source furnace 2 enters the indirect heating space between pyrolysis furnace 161 and heating furnace 162 through hot flue gas outlet 25, pipe 1 26, and hot flue gas inlet 17, transferring heat to pyrolysis furnace 161. This creates an airless environment for the plastic inside pyrolysis furnace 161 to pyrolyze. The pyrolysis gas produced is treated and then sent back to heat source furnace 2 for combustion through pyrolysis gas interface 23. Furthermore, the high-temperature carbon dioxide flue gas retains some heat after indirect heating, which can be reused. Therefore, after flowing out from hot flue gas return outlet 11, the high-temperature carbon dioxide flue gas has two possible paths through pipe 2 15. Specifically… One path is to enter the heat source furnace 2 via the flue gas recirculation interface 21 for reuse. Since these recirculated flue gases themselves carry heat, the temperature rises very quickly, which can shorten the heating time, reduce the consumption of cracked gas and oxygen, and reduce the heat loss of flue gas. Another path is to send the waste heat through the diversion port 12 for purification and recovery, and then collect and utilize it to avoid direct carbon dioxide emissions.
[0027] The advantages of this invention are: first, it replaces the existing method of directly heating and pyrolyzing industrial waste plastics by burning flue gas with pure oxygen, providing a stable and efficient heat source for the pyrolysis furnace; second, it recycles the generated carbon dioxide flue gas. Specifically, Pure oxygen combustion can improve the heat transfer capacity of flame radiation, shorten the flue gas heating time, and extend the service life of pyrolysis furnace 1. After pure oxygen combustion, the concentration and partial pressure of triatomic gases in the flame and flue gas are greatly increased. According to the gas radiation theory, only triatomic and polyatomic gases have strong radiation capacity, thus greatly improving the radiation capacity of flue gas. In addition, pure oxygen combustion is a diffuse flameless combustion method. The effective high temperature zone of the flame has sufficient rigidity and large volume. The flue gas is fully stirred and the temperature is uniform, which improves the radiation heat transfer efficiency and reduces the heat loss of flue gas emissions. High-temperature flue gas recycling can significantly save heating fuel. Heat source furnace 2 uses pure oxygen as a combustion aid and the flame generated by fuel combustion to heat the flue gas drawn back into heat source furnace 2 by the fan. Among them, the fan draws 5% to 95% of the flue gas back into heat source furnace 2 for reheating and recycling. In this way, only a small amount of fuel is needed to raise the temperature of the circulating flue gas to the temperature required for heat exchange with the material. It can make full use of the heat of the flue gas and improve the heating uniformity and heating quality. Compared with direct pyrolysis with air support, it can reduce fuel consumption by more than 50% and shorten the heating time by more than 50%. It has high thermal efficiency, improves production efficiency, and reduces the fuel cost of equipment operation. At the same time, the heat carried away by the flue gas is also greatly reduced, thus greatly reducing the heat loss of the flue gas and reducing fuel consumption. Finally, regarding carbon dioxide utilization, since the flue gas generated by the combustion of pure oxygen is composed of high-purity carbon dioxide, this greatly facilitates carbon dioxide capture and reuse, which aligns with the national dual-carbon emission reduction and energy conservation goals proposed at this stage, resulting in significant social benefits. This invention, on the one hand, recycles carbon dioxide flue gas, and on the other hand, collects and utilizes carbon dioxide flue gas, which can achieve zero carbon dioxide emissions and plays a crucial role in achieving the carbon neutrality goal as soon as possible.
[0028] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.
Claims
1. A method for producing oil from industrial waste plastics through pyrolysis without smoke emissions, characterized in that: Includes the following content: (I) Pure oxygen and cracked gas are burned in the heat source furnace (2) to generate carbon dioxide gas carrying heat; (II) Carbon dioxide gas carrying heat is used to pyrolyze the plastic in the pyrolysis furnace (1) by indirect heating; (III) A portion of the carbon dioxide gas after heat loss is recycled to the heat source furnace (2) for secondary heating, and another portion of the carbon dioxide gas after heat loss is collected and utilized after flue gas purification and waste heat recovery.
2. The method for producing oil from industrial waste plastics through pyrolysis with zero emissions according to claim 1, characterized in that: The gas produced by indirect heating and pyrolysis of plastics is separated and distilled to obtain pyrolysis gas for combustion.
3. The method for producing oil from industrial waste plastics through pyrolysis with zero emissions according to claim 1, characterized in that: Plastics are in an airless environment when they decompose.
4. A smokeless industrial waste plastic pyrolysis oil production device, characterized in that: A method for producing oil from industrial waste plastics with zero emissions according to any one of claims 1 to 3, comprising a pyrolysis furnace (1) and a heat source furnace (2). The pyrolysis furnace (1) is provided with an inner pyrolysis furnace chamber (161) and an outer heating furnace chamber (162). The interior of the pyrolysis furnace chamber (161) is a pyrolysis space, and the space between the pyrolysis furnace chamber (161) and the heating furnace chamber (162) is an indirect heating space. The pyrolysis furnace chamber (161) is provided with a pyrolysis gas outlet (13) and a heat preservation and heat equalization section. The heating furnace chamber (162) is provided with a hot flue gas inlet (17) and a hot flue gas return outlet (11). The heat source furnace (2) is equipped with an oxygen interface (22), a pyrolysis gas interface (23), a flue gas recirculation interface (21), and a hot flue gas outlet (25). The pyrolysis gas flowing out of the pyrolysis gas outlet (13) is processed and then enters the pyrolysis gas inlet (23). The hot flue gas outlet (25) is connected to the hot flue gas inlet (17) via pipe one (26), and the hot flue gas return outlet (11) is connected to the flue gas return interface (21) via pipe two (15). Pipe two (15) is provided with a diversion port (12) for sending the flue gas to be collected and utilized.
5. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: The heat source furnace (2) is also equipped with an ignition mechanism (24).
6. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: It also includes a feeding mechanism (3) and a feed inlet (31) connected to the feeding mechanism (3).
7. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: It also includes a pyrolysis residue crushing and conveying mechanism (14).
8. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: It also includes the fan installed on the path of pipe two (15).
9. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: The pyrolysis furnace (1) is equipped with a maintenance furnace door (18).
10. The smokeless industrial waste plastic pyrolysis oil production device according to claim 4, characterized in that: It also includes a control unit, a temperature sensor, and a pressure sensor.