Testing device and method for producing oil and gas through waste plastic pyrolysis

Abstract

The invention discloses a test device for producing oil and gas by waste plastic pyrolysis, which comprises a pyrolysis reactor, the pyrolysis reactor is connected with a condensing tower, the condensing tower is connected with a first oil washing tower, the first oil washing tower is connected with a second oil washing tower, the second oil washing tower is further connected with an oil washing filter, and the oil washing filter is connected with an oil washing pump. An outlet of the oil washing pump is respectively connected into the first oil washing tower and the second oil washing tower; the invention also discloses a test method for producing oil and gas by waste plastic pyrolysis, which specifically comprises the following steps: waste plastic and a heat carrier enter the pyrolysis reactor for pyrolysis treatment, ash and the heat carrier enter the condensing tower after pyrolysis, and enter the first oil washing tower for oil washing treatment after cooling; and the washed pyrolysis oil and pyrolysis gas enter a second oil washing tower for further oil washing, and then enter the oil washing tower again to realize recycling. According to the device, the pyrolysis time is controlled through the pyrolysis reactor, plastic coking in the test equipment can be avoided, and pyrolysis oil and pyrolysis gas can be prepared through a long-time continuous plastic pyrolysis test.

Description

Technical Field

[0001] This invention belongs to the technical field of waste plastic treatment equipment, specifically relating to an experimental apparatus for producing oil and gas from waste plastic pyrolysis, and also to an experimental method for producing oil and gas from waste plastic pyrolysis. Background Technology

[0002] Waste plastics are mostly consumed through combustion for heating. Due to economic constraints, the utilization of this energy is rather crude, causing not only serious environmental pollution but also a severe waste of petrochemical resources. Pyrolysis technology can convert hydrocarbon waste plastics into syngas, and through condensation and washing techniques, the pyrolysis gas and pyrolysis oil can be separated.

[0003] Changes in pyrolysis temperature, heating rate, and residence time during the gasification of waste plastics significantly affect the pyrolysis efficiency and energy consumption. Furthermore, the pyrolysis oil contains high levels of C1 and Si impurities. Influenced by the composition, structure, shape, and properties of waste plastics, the pyrolysis reaction is complex and variable, resulting in highly diverse reaction products. The interaction of influencing factors makes it difficult to accurately identify the optimal pyrolysis parameters for waste plastics. Therefore, studying the interactions of different factors during the pyrolysis of waste plastics is of great significance for understanding the process. Summary of the Invention

[0004] The purpose of this invention is to provide an experimental apparatus for producing oil and gas from waste plastics through pyrolysis, thereby improving the pyrolysis efficiency of waste plastics.

[0005] Another object of the present invention is to provide an experimental method for producing oil and gas from waste plastic pyrolysis.

[0006] The technical solution adopted in this invention is an experimental device for producing oil and gas from waste plastic pyrolysis, including a pyrolysis reactor. The pyrolysis reactor is connected to the inlet of a condenser tower via a pipeline. The outlet of the condenser tower is connected to the inlet of a first oil washing tower via a pipeline. The outlet of the first oil washing tower is connected to the inlet of a second oil washing tower via a pipeline. An oil washing filter is also connected to the lower part of the second oil washing tower. The oil washing filter is connected to the inlet of an oil washing pump. The outlet of the oil washing pump is also connected to the inside of the first oil washing tower and the inside of the second oil washing tower, respectively. The pyrolysis reactor includes a reactor shell. A feed hopper and a solid heat carrier feed hopper are provided at one end of the reactor shell. A main shaft is provided inside the reactor shell. Blades are provided on the main shaft, and the blades are spirally wound on the main shaft.

[0007] The invention is further characterized in that,

[0008] One end of the main shaft extends out of the inner wall of the reactor shell, and the end of the main shaft extending out of the reactor shell is connected to a reducer via a coupling. The reducer is driven by a variable frequency motor.

[0009] The reactor shell outer wall is wound with an electric heating coil; the other end of the reactor shell is also provided with an ash fraction outlet and an ash residue outlet on the upper side, and the ash fraction outlet is connected to the condensation tower through a pipeline.

[0010] The inlet of the condensation tower is also connected to the spray water pump through a spray pipeline, the spray pipeline horizontally extends into the inside of the condensation tower, and a plurality of spray nozzles are arranged on the spray pipeline.

[0011] The first oil washing tower comprises a tower outer shell, the top of the tower outer shell is provided with an oil gas inlet connected to the condensation tower through a pipeline, the bottom of the tower outer shell is provided with an outlet connected to the second oil washing tower through a pipeline; and the upper side of one side of the tower outer shell is also provided with a first pyrolysis gas outlet.

[0012] The second oil washing tower comprises an outer shell, the top of the outer shell is provided with an oil washing gas inlet connected to the outlet of the first oil washing tower, the bottom of the outer shell is provided with an oil washing outlet, the upper side of one side of the outer shell is provided with a second pyrolysis gas outlet, the lower side of the other side of the outer shell is connected to an oil washing filter, the outlet of the oil washing pump is connected to the upper part of the tower outer shell through a first outlet pipeline, and the outlet of the oil washing pump is connected to the upper part of the outer shell through a second outlet pipeline.

[0013] The first outlet pipeline horizontally extends into the inside of the outer shell, and a plurality of first nozzles are arranged on the extended first outlet pipeline; the second outlet pipeline horizontally extends into the inside of the outer shell, and a plurality of second nozzles are arranged on the extended second outlet pipeline.

[0014] Another technical solution adopted by the present application is a test method for preparing oil and gas from waste plastics by pyrolysis, which is specifically implemented according to the following steps:

[0015] Step 1: waste plastics are added through a feeding bin, and a heat carrier is added through a solid heat carrier feeding bin, and then the heat carrier and the waste plastics are introduced into a pyrolysis reactor for pyrolysis treatment, after pyrolysis, the ash fraction and the heat carrier are introduced into a condensation tower, and the high-temperature pyrolysis gas is cooled to 110-120 DEG C;

[0016] Step 2: the pyrolysis gas cooled in step 1 is introduced into a first oil washing tower for oil washing treatment, part of the pyrolysis gas is liquefied to become pyrolysis oil, and at the same time, the temperature of the pyrolysis gas is reduced to 95-115 DEG C, the washed pyrolysis oil and the pyrolysis gas are introduced into a second oil washing tower, the pyrolysis gas is further washed, the temperature of the pyrolysis gas after washing is 90-110 DEG C, more pyrolysis oil is washed out from the second oil washing tower, part of the pyrolysis oil passes through an oil washing filter, and then is introduced into the first oil washing tower and the second oil washing tower through an oil washing pump to realize recirculation, and the other part of the pyrolysis oil is discharged from the second oil washing tower.

[0017] The beneficial effects of this invention are as follows: The experimental device for producing oil and gas from waste plastic pyrolysis mainly consists of a feeding hopper, a solid heat carrier feeding hopper, a pyrolysis reactor, a condenser tower, two oil washing towers, and a pump. The number of devices is small, making it easy to use in production and saving production costs. Furthermore, by controlling the pyrolysis time through electric heating, it can meet the needs of pyrolysis tests for different types of waste plastics. By controlling the pyrolysis time through the reactor, it can avoid the plastic from coking inside the experimental device, enabling long-term continuous plastic pyrolysis tests to produce pyrolysis oil and pyrolysis gas. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the experimental apparatus for producing oil and gas from waste plastic pyrolysis according to the present invention;

[0019] Figure 2 This is a structural diagram of the pyrolysis reactor in the experimental apparatus for producing oil and gas from waste plastics according to the present invention.

[0020] Figure 3 This is a structural diagram of the first oil washing tower in the experimental apparatus for producing oil and gas from waste plastic pyrolysis according to the present invention;

[0021] Figure 4 This is a structural diagram of the second oil washing tower in the experimental apparatus for producing oil and gas from waste plastic pyrolysis according to the present invention.

[0022] In the diagram: 1. Feed hopper; 2. Solid heat carrier feed hopper; 3. Pyrolysis reactor; 4. Condensation tower; 5. First oil washing tower; 6. Second oil washing tower; 7. Oil washing filter; 8. Oil washing pump; 9. Spray water pump; 10. Spray pipe; 11. Spray nozzle; 12. First outlet pipe; 13. First nozzle; 14. Second outlet pipe; 15. Second nozzle; 3-1. Coupling; 3-2. Reducer; 3-3. Variable frequency motor; 3-4. Reactor shell; 3-5. Main shaft; 3-6. Blade; 3-7. Ash outlet; 3-8. Ash and slag outlet; 5-1. Oil and gas inlet; 5-2. Outlet; 5-3. First pyrolysis gas outlet; 5-4. Tower shell; 6-1. Oil washing gas inlet; 6-2. Wash oil outlet; 6-3. Second pyrolysis gas outlet; 6-4. Shell. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] The experimental apparatus for producing oil and gas from waste plastic pyrolysis according to the present invention, such as... Figure 1 As shown, it includes a pyrolysis reactor 3, which is connected to the inlet of a condenser tower 4 via a pipe. The inlet of the condenser tower 4 is also connected to a spray water pump 9 via a spray pipe 10. The spray pipe 10 extends horizontally into the interior of the condenser tower 4 and is equipped with multiple spray nozzles 11.

[0025] The outlet of condenser tower 4 is connected to the inlet of first oil washing tower 5 via a pipe. First oil washing tower 5 is located below condenser tower 4. The outlet of first oil washing tower 5 is connected to the inlet of second oil washing tower 6 via a pipe. Second oil washing tower 6 is located below first oil washing tower 5. Oil washing filter 7 is also connected to the lower part of second oil washing tower 6. Oil washing filter 7 is connected to the inlet of oil washing pump 8. The outlet of oil washing pump 8 is also connected to the inside of first oil washing tower 5 and second oil washing tower 6 respectively.

[0026] Pyrolysis reactor 3, such as Figure 2 As shown, the reactor includes a reactor shell 3-4, with an electric heating coil wound around its outer wall; a main shaft 3-5 is installed inside the reactor shell 3-4, and blades 3-6 are installed on the main shaft 3-5. The blades 3-6 are spirally wound around the main shaft 3-5. One end of the main shaft 3-5 extends out of the inner wall of the reactor shell 3-4, and the end of the main shaft 3-5 extending out of the reactor shell is connected to a reducer 3-2 through a coupling 3-1. The reducer 3-2 is driven by a variable frequency motor 3-3.

[0027] A feed hopper 1 and a solid heat carrier feed hopper 2 are provided at one end of the reactor shell 3-4. The feed hopper 1 and the solid heat carrier feed hopper 2 are connected to the reactor shell 3-4 by a flange; the feed hopper 1 is close to the coupling 3-1.

[0028] The reactor shell 3-4 is also provided with an ash outlet 3-7 and an ash slag outlet 3-8 on the upper and lower sides of the other end. The ash outlet 3-7 is connected to the condenser tower 4 through a pipe, and the ash slag outlet 3-8 is located directly below the ash outlet 3-7.

[0029] First oil washing tower 5, such as Figure 3 As shown, the tower includes an outer shell 5-4, an oil and gas inlet 5-1 at the top of the outer shell 5-4, which is connected to the condenser tower 4 via a pipeline, an outlet 5-2 at the bottom of the outer shell 5-4, which is connected to the second oil washing tower 6 via a pipeline; and a first pyrolysis gas outlet 5-3 is also provided on the upper side of one side of the outer shell 5-4.

[0030] Second oil washing tower 6, such as Figure 4As shown, the system includes an outer shell 6-4. An oil washing gas inlet 6-1 is located at the top of the outer shell 6-4, connected to the outlet 5-2 of the first oil washing tower 5. An oil washing outlet 6-2 is located at the bottom of the outer shell 6-4. A second pyrolysis gas outlet 6-3 is located on the upper part of one side of the outer shell 6-4. An oil washing filter 7 is connected to the lower part of the other side of the outer shell 6-4, connected to the inlet of an oil washing pump 8. The outlet of the oil washing pump 8 is connected to the upper part of the outer shell 5-4 via a first outlet pipe 12, which extends horizontally into the interior of the outer shell 5-4 and is equipped with multiple first nozzles 13. The outlet of the oil washing pump 8 is connected to the upper part of the outer shell 6-4 via a second outlet pipe 14, which extends horizontally into the interior of the outer shell 6-4 and is equipped with multiple second nozzles 15.

[0031] Both feed hopper 1 and solid heat carrier feed hopper 2 have a conical structure, with the cone angle not exceeding 60 degrees. They are made of carbon steel plates. To ensure smooth material discharge, the height of the feed hoppers should be controlled to prevent bridging during discharge. Solid heat carrier feed hopper 2 is made of high-temperature resistant materials and includes electric heating and control equipment to achieve electric heating and control functions.

[0032] Condensing tower 4 is a cooling device. High-temperature pyrolysis gas enters from the top of the condensing tower, condenses, and exits from the bottom. Condensate enters from the bottom of the condensing tower and exits from the top. Cooling water nozzles are installed inside the condensing tower for spraying and dust removal. The condensate and pyrolysis gas flow in a counter-current manner, which helps to reduce the final temperature of the high-temperature pyrolysis gas. To simplify production, it can be constructed using welded steel plates.

[0033] The function of the oil washing tower is to separate non-condensable gases and pyrolysis oil from the pyrolysis gas. The washing oil is sprayed from the nozzle at the top of the oil washing tower, atomized, and comes into full contact with the pyrolysis gas to form large droplets, which fall into the oil washing tower, pass through a filter and a circulating pump, and then re-enter the top nozzle for reuse. To improve washing efficiency, a two-stage oil washing tower is used to effectively remove tar from the pyrolysis gas.

[0034] The pyrolysis reactor 3 adopts a shafted high-temperature spiral structure with high structural strength. The maximum operating temperature of the pyrolysis reactor 3 can reach 700℃. The shell is electrically heated. To ensure a uniform temperature within the internal pyrolysis reactor, external insulation material made of aluminum silicate is required. The main component of the aluminum silicate insulation material is aluminum silicate, which is non-flammable in open flame and resistant to high temperatures. The operating temperature can reach 1000℃.

[0035] The experimental method for producing oil and gas from waste plastic pyrolysis according to the present invention is implemented according to the following steps:

[0036] Step 1: Waste plastic is added through feed hopper 1 and heat carrier is added through solid heat carrier feed hopper 2. The mixture enters pyrolysis reactor 3 for pyrolysis treatment. After pyrolysis, ash and heat carrier are discharged from ash outlet 3-7. High-temperature pyrolysis gas enters condenser tower 4 to cool the high-temperature pyrolysis gas to 110-120℃.

[0037] The pyrolysis temperature is 650-670℃, the pyrolysis time is 18-20min, and the speed of the variable frequency motor is 8-10rpm.

[0038] Step 2: The pyrolysis gas cooled in Step 1 enters the first oil washing tower 5 for oil washing treatment. Part of the pyrolysis gas liquefies into pyrolysis oil, and the temperature of the pyrolysis gas decreases to 95-115℃. The washed pyrolysis oil and pyrolysis gas enter the second oil washing tower 6 for further oil washing. After oil washing, the temperature of the pyrolysis gas is 90-110℃. The second oil washing tower 6 washes out more pyrolysis oil. Part of the pyrolysis oil passes through the oil washing filter 7, and then through the oil washing pump 8, and enters the first outlet pipe 12 and the second outlet pipe 14 respectively, and re-enters the first oil washing tower 5 and the second oil washing tower 6 to achieve recirculation. The other part of the pyrolysis oil is discharged from the second oil washing tower 6 through the washing oil outlet 6-5.

[0039] In the method of this invention, the solid heat carrier is used for pyrolysis, which solves the problem of high-temperature coking during the pyrolysis reaction, enables the pyrolysis reactor to self-clean during the pyrolysis process, and improves the efficiency of continuous pyrolysis of the equipment.

[0040] The experimental apparatus for producing oil and gas from waste plastic pyrolysis of this invention comprises a pyrolysis reactor. Due to the long reaction time and high temperature, the pyrolysis reactor provides sufficient space for the reaction. The reactor uses an external heat source, electrically heated, allowing for precise control of the pyrolysis temperature. Its spiral structure enables precise control of the material's residence time within the reactor. By adjusting the reactor's operating parameters, the required pyrolysis parameters can be obtained, achieving efficient pyrolysis and meeting the long-duration, high-temperature equipment requirements of the pyrolysis reaction. Because the waste plastic pyrolysis process involves high temperatures, reaching up to 900°C, coking can be prevented by feeding waste plastic and a heat carrier together. The heat carrier effectively prevents coking of the high-temperature waste plastic inside the reactor shell.

[0041] Example 1

[0042] The experimental method for producing oil and gas from waste plastic pyrolysis according to the present invention is implemented according to the following steps:

[0043] Step 1: 50 kg of waste plastic is added through feed hopper 1. The main components of the waste plastic are polyethylene (PE), polypropylene (PP), polystyrene (PS) and polyvinyl chloride (PVC). The heat carrier quartz sand is added through solid heat carrier feed hopper 2 and enters the pyrolysis reactor 3 for pyrolysis treatment. After pyrolysis, the ash and heat carrier are discharged from the ash outlet 3-7. The high-temperature pyrolysis gas enters the condenser tower 4 to cool the high-temperature pyrolysis gas to 110°C.

[0044] The pyrolysis temperature is 650℃, the pyrolysis time is 18min, and the speed of the variable frequency motor is 8rpm.

[0045] Step 2: The pyrolysis gas cooled in Step 1 enters the first oil washing tower 5 for oil washing treatment. Part of the pyrolysis gas liquefies into pyrolysis oil, and the temperature of the pyrolysis gas decreases to 95°C. The washed pyrolysis oil and pyrolysis gas enter the second oil washing tower 6 for further oil washing. After oil washing, the temperature of the pyrolysis gas is 90°C. The second oil washing tower 6 washes out more pyrolysis oil. Part of the pyrolysis oil passes through the oil washing filter 7, and then through the oil washing pump 8, and enters the first outlet pipe 12 and the second outlet pipe 14 respectively, and re-enters the first oil washing tower 5 and the second oil washing tower 6 to achieve recirculation. The other part of the pyrolysis oil is discharged from the second oil washing tower 6 through the washing oil outlet 6-5.

[0046] Under the parameters of this embodiment, the pyrolysis of waste plastics yields a mixture of 5.49 kg of fuel gas, 35.9 kg of tar, and 8.61 kg of solid residue.

[0047] Example 2

[0048] The experimental method for producing oil and gas from waste plastic pyrolysis according to the present invention is implemented according to the following steps:

[0049] Step 1: 50 kg of waste plastic is added through feed hopper 1, and quartz sand, the heat carrier, is added through solid heat carrier feed hopper 2. The mixture enters the pyrolysis reactor 3 for pyrolysis treatment. After pyrolysis, the ash and heat carrier are discharged from the ash outlet 3-7. The high-temperature pyrolysis gas enters the condenser tower 4 to cool the high-temperature pyrolysis gas to 115°C.

[0050] The pyrolysis temperature is 660℃, the pyrolysis time is 20min, and the speed of the variable frequency motor is 10rpm.

[0051] Step 2: The pyrolysis gas cooled in Step 1 enters the first oil washing tower 5 for oil washing treatment. Part of the pyrolysis gas liquefies into pyrolysis oil, and the temperature of the pyrolysis gas decreases to 100℃. The washed pyrolysis oil and pyrolysis gas enter the second oil washing tower 6 for further oil washing. After oil washing, the temperature of the pyrolysis gas is 110℃. The second oil washing tower 6 washes out more pyrolysis oil. Part of the pyrolysis oil passes through the oil washing filter 7, and then through the oil washing pump 8, and enters the first outlet pipe 12 and the second outlet pipe 14 respectively, and re-enters the first oil washing tower 5 and the second oil washing tower 6 to achieve recirculation. The other part of the pyrolysis oil is discharged from the second oil washing tower 6 through the washing oil outlet 6-5.

[0052] During the experiment, the pyrolysis of waste plastics yielded a mixture of 45% fuel gas, 25% tar, and 30% solid residue.

[0053] Example 3

[0054] The experimental method for producing oil and gas from waste plastic pyrolysis according to the present invention is implemented according to the following steps:

[0055] Step 1: 50kg of waste plastic is added through feed hopper 1, and quartz sand, the heat carrier, is added through solid heat carrier feed hopper 2. The mixture enters the pyrolysis reactor 3 for pyrolysis treatment. After pyrolysis, the ash and heat carrier are discharged from the ash outlet 3-7. The high-temperature pyrolysis gas enters the condenser tower 4 to cool the high-temperature pyrolysis gas to 120℃.

[0056] The pyrolysis temperature is 670℃, the pyrolysis time is 20min, and the speed of the variable frequency motor is 10rpm.

[0057] Step 2: The pyrolysis gas cooled in Step 1 enters the first oil washing tower 5 for oil washing treatment. Part of the pyrolysis gas liquefies into pyrolysis oil, and the temperature of the pyrolysis gas decreases to 115°C. The washed pyrolysis oil and pyrolysis gas enter the second oil washing tower 6 for further oil washing. After oil washing, the temperature of the pyrolysis gas is 110°C. The second oil washing tower 6 washes out more pyrolysis oil. Part of the pyrolysis oil passes through the oil washing filter 7, and then through the oil washing pump 8, and enters the first outlet pipe 12 and the second outlet pipe 14 respectively, and re-enters the first oil washing tower 5 and the second oil washing tower 6 to achieve recirculation. The other part of the pyrolysis oil is discharged from the second oil washing tower 6 through the washing oil outlet 6-5.

Claims

1. An experimental apparatus for producing oil and gas from waste plastic pyrolysis, characterized in that, The reactor includes a pyrolysis reactor (3), which is connected to the inlet of a condenser tower (4) via a pipe. The outlet of the condenser tower (4) is connected to the inlet of a first oil washing tower (5) via a pipe. The outlet of the first oil washing tower (5) is connected to the inlet of a second oil washing tower (6) via a pipe. An oil washing filter (7) is also connected to the lower part of the second oil washing tower (6). The oil washing filter (7) is connected to the inlet of an oil washing pump (8). The outlet of the oil washing pump (8) is also connected to the inside of the first oil washing tower (5) and the inside of the second oil washing tower (6). The pyrolysis reactor (3) includes a reactor shell (3-4). A feed bin (1) and a solid heat carrier feed bin (2) are provided at one end of the reactor shell (3-4). A main shaft (3-5) is provided inside the reactor shell (3-4). Blades (3-6) are provided on the main shaft (3-5). The blades (3-6) are spirally wound on the main shaft (3-5).

2. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 1, characterized in that, One end of the main shaft (3-5) extends out of the inner wall of the reactor shell (3-4). The end of the main shaft (3-5) extending out of the reactor shell is connected to the reducer (3-2) via a coupling (3-1). The reducer (3-2) is driven by a variable frequency motor (3-3).

3. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 1, characterized in that, The outer wall of the reactor shell (3-4) is wound with an electric heating coil; the upper and lower sides of the other end of the reactor shell (3-4) are also provided with an ash outlet (3-7) and an ash slag outlet (3-8), and the ash outlet (3-7) is connected to the condenser tower (4) through a pipe.

4. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 1, characterized in that, The inlet of the condenser (4) is also connected to the spray water pump (9) through a spray pipe (10). The spray pipe (10) extends horizontally into the condenser (4) and is equipped with multiple spray nozzles (11).

5. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 1, characterized in that, The first oil washing tower (5) includes a tower shell (5-4), an oil and gas inlet (5-1) is provided at the top of the tower shell (5-4), the oil and gas inlet (5-1) is connected to the condenser tower (4) through a pipe, an outlet (5-2) is provided at the bottom of the tower shell (5-4), and the outlet (5-2) is connected to the second oil washing tower (6) through a pipe; a first pyrolysis gas outlet (5-3) is also provided on the upper part of one side of the tower shell (5-4).

6. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 1, characterized in that, The second oil washing tower (6) includes an outer shell (6-4), an oil washing gas inlet (6-1) is provided at the top of the outer shell (6-4), the oil washing gas inlet (6-1) is connected to the outlet (5-2) of the first oil washing tower (5), an oil washing outlet (6-2) is provided at the bottom of the outer shell (6-4), a second pyrolysis gas outlet (6-3) is provided on the upper part of one side of the outer shell (6-4), and the lower part of the other side of the outer shell (6-4) is connected to the oil washing filter (7). The outlet of the oil washing pump (8) is connected to the upper part of the tower outer shell (5-4) through a first outlet pipe (12), and the outlet of the oil washing pump (8) is connected to the upper part of the outer shell (6-4) through a second outlet pipe (14).

7. The experimental apparatus for producing oil and gas from waste plastic pyrolysis as described in claim 6, characterized in that, The first outlet pipe (12) extends horizontally into the interior of the outer shell (5-4), and a plurality of first nozzles (13) are provided on the extended first outlet pipe (12); the second outlet pipe (14) extends horizontally into the interior of the outer shell (6-4), and a plurality of second nozzles (15) are provided on the extended second outlet pipe (14).

8. A test method for producing oil and gas from waste plastic pyrolysis, implemented using the test apparatus for producing oil and gas from waste plastic pyrolysis as described in any one of claims 1-7, characterized in that, The specific steps are as follows: Step 1: Waste plastic is added through the feed hopper (1), and heat carrier is added through the solid heat carrier feed hopper (2). The heat carrier enters the pyrolysis reactor (3) for pyrolysis treatment. The pyrolysis treatment temperature is 650-670℃ and the pyrolysis treatment time is 18-20min. After pyrolysis, the ash and heat carrier enter the condenser (4) to cool the high-temperature pyrolysis gas to 110-120℃. Step 2: The pyrolysis gas cooled in Step 1 enters the first oil washing tower (5) for oil washing. Part of the pyrolysis gas is liquefied into pyrolysis oil. At the same time, the temperature of the pyrolysis gas is reduced to 95-115℃. The washed pyrolysis oil and pyrolysis gas enter the second oil washing tower (6). The pyrolysis gas is further washed with oil. After oil washing, the temperature of the pyrolysis gas is 90-110℃. The second oil washing tower (6) washes out more pyrolysis oil. Part of the pyrolysis oil passes through the oil washing filter (7), and then through the oil washing pump (8) and re-enters the first oil washing tower (5) and the second oil washing tower (6) to achieve recirculation. The other part of the pyrolysis oil is discharged from the second oil washing tower (6).

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