Device for preparing fuel oil through waste plastic double-heat-carrier circulation rapid pyrolysis

Abstract

According to the waste plastic double-heat-carrier circulating rapid pyrolysis fuel oil preparation device provided by the invention, a waste plastic crusher is communicated with the top of a downward pyrolysis reactor through a controllable feeder, and the upper part of the downward pyrolysis reactor is respectively communicated with a pyrolysis dry gas heat exchanger and a primary solid heat carrier return feeder; the bottom of the downward pyrolysis reactor is connected to the top of the moving bed reactor; the top of the moving bed reactor is communicated with the fractionating tower; the bottom of the moving bed is communicated with the lifting pipe heating regenerator through a to-be-generated heat carrier return feeder; a gas distributor, an ash discharge pipe and a gas inlet pipe are arranged at the bottom of the riser heating regenerator, and a first-stage gas-solid separator and a second-stage gas-solid separator are arranged at the top of the riser heating regenerator; a gas outlet of the second-stage gas-solid separator is provided with a pyrolysis dry gas heat exchanger and a waste heat boiler; a wax oil outlet, a diesel oil outlet and a gasoline outlet are formed in the bottom and the upper part of the fractionating tower, one path of tower top dry gas is connected with a water-cooling feeding pipe, the other path of tower top dry gas is communicated with a pyrolysis dry gas heat exchanger and a high-temperature gas hot melting section, and residual dry gas is delivered as a product.

Description

1. Technical Field

[0001] The invention provides a device for preparing fuel oil by rapid pyrolysis of waste plastics through double heat carrier circulation, belonging to the field of environmental engineering. 2. Background technology

[0002] The increasing use of plastic resins has brought great convenience to people's lives, but also brought a lot of white pollution. The use cycle of plastics is very short. A large number of plastic products, especially packaging materials, are discarded after about 6-12 months. 40% of plastics are discarded after 1-2 years. The total annual output of plastic waste in the world has reached 50 million tons. In the past few decades, waste plastics have been regarded as part of municipal solid waste (MSW). According to surveys, waste plastics account for 4%-10% (wt) or 10%-20% (v%) in MSW in industrialized countries, mainly from packaging waste, automobile garbage and processing waste. The percentages of various types of waste plastics are: low-density polyethylene (LDPE) 27%; high-density polyethylene (HDPE) 21%; polypropylene (PP) 18%; polystyrene (PS) 16%; polyvinyl chloride (PVC) 7%. Due to the lack of efficient, clean and large-scale technology, waste plastics have become an environmental problem that needs to be solved in the world.

[0003] In the treatment of urban plastic solid waste, landfill, incineration and recycling are the three main methods currently used. Due to different national conditions, each country has its own differences. The United States mainly uses landfill, while Europe and Japan mainly use incineration.

[0004] (1) Landfill treatment is adopted because plastic products are large and light (65kg / m 3 ), difficult to compress, airtight, easy to expand and not easy to rot, which will cause the landfill to become a soft foundation, causing water pollution, occupying land, sewer blockage, etc. Therefore, most developed countries strictly prohibit the disposal of large amounts of plastic waste by landfill.

[0005] (2) Incineration for heating or power generation. Plastic waste is a chemical substance with a high calorific value extracted from petroleum. It has the highest average calorific value among all household waste. In order to make plastic waste energy-efficient and economical, sending plastic waste to incinerators for combustion can provide heat for heating or power generation. However, considering that plastic waste incineration produces dioxin and fly ash pollution and the strong corrosive and destructive power of chlorine gas released during combustion, many environmental groups oppose the incineration of plastics. At present, Germany has 200,000 tons of PVC waste each year, of which 30% is burned in incinerators, causing panic among the people. The law has to formulate countermeasures for this. The German Federal Environment Agency has stipulated that all incinerators must meet the limit of less than 0.1ng (nanogram) per cubic meter of exhaust gas. Although Germany's incinerator air pollution standards are already recognized as high standards in the world, it still dares not to say that the combustion method will not release harmful substances due to mechanical failure. Therefore, it can be predicted that environmental groups in various countries will still strongly oppose the incineration method to recover heat energy.

[0006] (3) Recycling and reuse methods. Due to the labor-intensive, high recycling costs and lack of corresponding recycling channels, recycling and reuse currently only accounts for about 15% of the total plastic consumption in the world. However, due to the limited oil resources in the world, from the perspective of saving earth resources, the recycling and reuse of plastics is of great significance. To this end, countries around the world are currently investing a lot of manpower and material resources to develop various key technologies for recycling and reuse of waste plastics, and are committed to reducing the cost of recycling and reuse of plastics and developing suitable application areas.

[0007] The thermal decomposition of waste plastics is an effective recycling method that heats waste plastics at high temperatures under anaerobic or low-oxygen conditions to decompose them and reproduce valuable products, such as the pyrolysis and liquefaction of waste plastics to produce gasoline, diesel, petroleum wax and other chemical raw materials. However, due to the characteristics of waste plastics such as large size and light weight, difficulty in compression, airtightness, easy expansion, easy melting and bonding, and poor thermal conductivity, it is difficult to solve the problem of continuous feeding and rapid heating. At present, most of the pyrolysis and liquefaction of waste plastics adopt reactor-type intermittent reactions and horizontal rotary kiln reactions, which have slow heating rates, serious feed adhesion and coking, low liquid product yields, and difficulty in improving processing capacity. It is difficult to scale up the pyrolysis device, which restricts the efficient, clean and large-scale utilization of waste plastics. At present, there is no large-scale pyrolysis device in commercial operation, and it is urgent to develop continuous and rapid pyrolysis and liquefaction processes and equipment technologies for waste plastics. 3. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the existing waste plastic pyrolysis liquefaction technology and provide a waste plastic dual heat carrier circulation rapid pyrolysis and fuel production device. Through the classification of pyrolysis dry gas and the rational utilization according to different temperatures and the two-stage combination of gas and solid heat carriers, the four common problems in the industry of waste plastic feed adhesion and coking, difficulty in mixing with heat carriers, low liquid product yield, and difficulty in scaling up pyrolysis equipment are solved.

[0009] The technical solution of the present invention:

[0010] The device for preparing fuel oil by rapid pyrolysis of waste plastic with dual heat carrier circulation is composed of a waste plastic crusher, a controllable feeder, a dual heat carrier descending pyrolysis reactor, a moving bed reactor, a return feeder for the heat carrier to be generated, a riser heating regenerator, a gas distributor, an ash discharge pipe, an air inlet pipe, a first-stage gas-solid separator, a first-stage solid heat carrier return feeder, a second-stage gas-solid separator, a hot ash circulation pipe, an oil-gas separator, a fractionation tower, etc.; the waste plastic crusher is connected to the water-cooled feed pipe at the top of the dual heat carrier descending pyrolysis reactor through the controllable feeder, the high-temperature gas hot melting section at the top of the dual heat carrier descending pyrolysis reactor is respectively connected to the pyrolysis dry gas heat exchanger and the first-stage solid heat carrier return feeder, the bottom of the dual heat carrier descending pyrolysis reactor is connected to the inner side of the top of the moving bed reactor; the outer side of the top of the moving bed reactor is connected to the fractionation tower through the oil-gas separator; the bottom of the moving bed reactor is connected to the heat carrier to be generated The returner is connected with the riser heating regenerator; a gas distributor, an ash discharge pipe and an air inlet pipe are arranged at the bottom of the riser heating regenerator, and a first-stage gas-solid separator and a second-stage gas-solid separator are arranged at the top; the first-stage gas-solid separator is connected with the upper part of the dual heat carrier descending pyrolysis reactor through the first-stage solid heat carrier returner, and the ash outlet of the second-stage gas-solid separator is connected with the bottom of the riser heating regenerator through the hot ash circulation pipe and the hot ash circulation returner; the gas outlet of the second-stage gas-solid separator is provided with a pyrolysis dry gas heat exchanger and a waste heat boiler; a wax oil outlet, a diesel outlet and a gasoline outlet are arranged at the bottom and the top of the distillation tower, and an induced draft fan is arranged at the pyrolysis dry gas outlet at the top of the tower, one path of dry gas is connected with a water-cooled feed pipe, and the other path of dry gas is pressurized and heated by a pressurized fan and a pyrolysis dry gas heat exchanger, and then returns to the upper part of the high-temperature gas hot melting section of the dual heat carrier descending pyrolysis reactor, and the remaining dry gas is sent out as a product.

[0011] A feed pipe with a water-cooling jacket is arranged on the top of the double heat carrier descending pyrolysis reactor, and the size is 0-100mm smaller than the reactor inner cavity; a high-temperature pyrolysis dry gas inner jacket with a thickness of 10mm-100mm is formed by the inner cavity and a porous plate with an opening rate of 0.1%-15% at the upper part of the reactor, and the jacket height is 0.5-4 times the equivalent diameter of the inner cavity; an inclined solid heat carrier inlet is arranged on the side of the upper part of the reactor, which is located 100-1500mm downward from the top of the reactor and has a horizontal angle of 0-85°; a mixed internal component composed of 1-10 guide plates with a horizontal downward inclination of 25°-85° is arranged in the reactor inner cavity, and adjacent guide plates are staggered at 180°, and the distance between the bottom end of the guide plate and the opposite inner cavity wall is 100-400mm.

[0012] The controllable feeder is a rotary feeder, a double-shaft screw feeder or a single-shaft screw feeder.

[0013] The equivalent diameter of the upper part of the moving bed reactor is 1.2-4.0 times larger than that of the dual heat carrier descending pyrolysis reactor. The outlet and the oil and gas outlet of the dual heat carrier descending pyrolysis reactor are respectively installed on both sides of the top of the moving bed reactor; the bottom of the moving bed reactor is conical and directly connected to the return feeder of the heat carrier to be generated with a crushing function.

[0014] The riser heating regenerator is composed of a turbulent fluidized bed at the bottom and a carrying reactor at the top. The turbulent fluidized bed has a larger equivalent diameter, while the carrying reactor has a smaller equivalent diameter, and the diameter ratio is 2 to 3:1. The carrying reactor can be a straight tube reactor with a uniform equivalent diameter, or it can be composed of large and small straight tubes with diameters of different multiples of the equivalent diameter connected by large and small head pipe fittings, and the diameter ratio of the large and small straight tubes is 1.2 to 2:1. The equivalent diameter of the fluidized bed is only 10%-50% of the equivalent diameter of the turbulent fluidized bed.

[0015] The outlet temperature of the dual heat carrier descending pyrolysis reactor is 400-600℃, the reaction temperature at the bottom of the riser heating regenerator is 800-1200℃, the reaction temperature at the top outlet is 650-1000℃, and the temperature of the pyrolysis dry gas after heat exchange is 300℃-600℃.

[0016] The present invention will be described in detail with reference to embodiments. 4. Description of the drawings

[0017] Attached photos Figure 1 This is a schematic diagram of the structure of the device for producing fuel oil by rapid pyrolysis of waste plastics using dual heat carrier cycles according to the present invention.

[0018] The drawings of the accompanying drawings are as follows:

[0019] 1. Waste plastic crusher 2. Controllable feeder 3. Water-cooled feed pipe 4. High-temperature gas hot melt section 5. Dual heat carrier descending pyrolysis reactor 6. Moving bed reactor 7. Oil-gas separator 8. Fractionation tower 9. Wax oil outlet 10. Diesel outlet 11. Gasoline outlet 12. Induced draft fan 13. Pyrolysis dry gas outlet 14. Pyrolysis dry gas heat exchanger 15. Waste heat boiler 16. Flue gas outlet 17. Return feeder for heat carrier to be generated 18. Riser heating regenerator 19. Gas distributor 20. Inlet pipe 21. Ash discharge port 22. First-stage gas-solid separator 23. First-stage solid heat carrier return feeder 24. Second-stage gas-solid separator 25. Hot ash circulation return feeder 26. Pressurized fan

[0020] The process characteristics of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. 5. Specific implementation methods

[0021] A device for preparing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier circulation comprises a waste plastic crusher (1), a controllable feeder (2), a dual heat carrier descending pyrolysis reactor (5), a moving bed reactor (6), a return device for the heat carrier to be generated (17), a riser heating regenerator (18), a gas distributor (19), an ash discharge pipe (21), an air inlet pipe (20), a first-stage gas-solid separator (22), a first-stage solid heat carrier return device (23), a second-stage gas-solid separator (24), a hot ash circulation return device (1), an oil-gas separator (7), a fractionation tower (8), etc.; waste plastic powder The crusher (1) is connected to the water-cooled feed pipe (3) at the top of the dual heat carrier descending pyrolysis reactor (5) through a controllable feeder (2); the high-temperature gas heat melting section (4) at the top of the dual heat carrier descending pyrolysis reactor (5) is respectively connected to the pyrolysis dry gas heat exchanger (14) and the primary solid heat carrier return feeder (23); the bottom of the dual heat carrier descending pyrolysis reactor (5) is connected to the inner side of the top of the moving bed reactor (6); the outer side of the top of the moving bed reactor (6) is connected to the fractionation tower (8) through an oil-gas separator (7); the bottom of the moving bed reactor (6) is connected to the fractionation tower (8) through the return feeder (23) of the heat carrier to be generated 17) is connected to the riser heating regenerator (18); the bottom of the riser heating regenerator (18) is provided with a gas distributor (19), an ash discharge pipe (21) and an air inlet pipe (20), and the top is provided with a first-stage gas-solid separator (22) and a second-stage gas-solid separator (24); the first-stage gas-solid separator (22) is connected to the upper part of the dual heat carrier descending pyrolysis reactor (5) through a first-stage solid heat carrier return feeder (23), and the ash outlet of the second-stage gas-solid separator (24) is connected to the bottom of the riser heating regenerator (18) through a hot ash circulation pipe and a hot ash circulation return feeder (25); The gas outlet of the second-stage gas-solid separator (24) is provided with a pyrolysis dry gas heat exchanger (14) and a waste heat boiler (15); the bottom and top of the fractionation tower (8) are provided with a wax oil outlet (9), a diesel outlet (10) and a gasoline outlet (11); the pyrolysis dry gas outlet at the top of the fractionation tower (8) is provided with an induced draft fan (12); one path of dry gas is connected to a water-cooled feed pipe (3); the other path of dry gas is pressurized and heated by a pressurized fan (26) and a pyrolysis dry gas heat exchanger (14) and then returns to the upper part of the high-temperature gas hot melt section (4) of the dual heat carrier descending pyrolysis reactor (5); and the remaining dry gas is sent out as a product.

[0022] The top of the dual heat carrier descending pyrolysis reactor (5) is provided with a feed pipe with a water cooling jacket, the size of which is 0-100 mm smaller than the reactor inner cavity; the upper part of the reactor is provided with a high-temperature pyrolysis dry gas inner jacket with a thickness of 10 mm-100 mm formed by the inner cavity and a porous plate with an opening rate of 0.1%-15%, and the jacket height is 0.5-4 times the equivalent diameter of the inner cavity; an inclined solid heat carrier inlet is provided on the side of the upper part of the reactor, located 100-1500 mm downward from the top of the reactor, with a horizontal downward angle of 0-85°; the inner cavity of the reactor is provided with a mixed internal component consisting of 1-10 guide plates with a horizontal downward inclination of 25°-85°, the adjacent guide plates are staggered 180°, and the bottom end of the guide plate is 100-400 mm away from the opposite inner cavity wall.

[0023] The controllable feeder (2) is a rotary feeder, a double-shaft screw feeder or a single-shaft screw feeder.

[0024] The equivalent diameter of the upper portion of the moving bed reactor (6) is 1.2-4.0 times greater than that of the dual heat carrier descending pyrolysis reactor (5); the outlet and the oil and gas outlet of the dual heat carrier descending pyrolysis reactor (5) are respectively installed on both sides of the top of the moving bed reactor (6); the bottom of the moving bed reactor (6) is conical and directly connected to the return feeder (17) of the heat carrier to be generated with a crushing function.

[0025] The riser heating regenerator (18) is composed of a turbulent fluidized bed at the bottom and a carrying reactor at the top. The turbulent fluidized bed has a larger equivalent diameter, while the carrying reactor has a smaller equivalent diameter, and the diameter ratio is 2 to 3:1. The carrying reactor can be a straight tube reactor with a uniform equivalent diameter, or can be composed of large and small straight tubes with diameters of different multiples of the equivalent diameter connected by large and small head pipe fittings, and the diameter ratio of the large and small straight tubes is 1.2 to 2:1. The equivalent diameter of the fluidized bed is only 10% to 50% of the equivalent diameter of the turbulent fluidized bed.

[0026] The outlet temperature of the dual heat carrier descending pyrolysis reactor (5) is 400-600°C; the reaction temperature at the bottom of the riser heating regenerator (18) is 800-1200°C, the reaction temperature at the top outlet is 650-1000°C, and the temperature of the pyrolysis dry gas after heat exchange is 300-600°C.

[0027] In specific operation, the waste plastic is first crushed by a waste plastic crusher (1), and then the waste plastic fragments with a size of 0 to 30 mm are added to a water-cooled feed pipe with a water-cooled jacket on the top of a dual heat carrier descending pyrolysis reactor (5) by a controllable feeder (2), and flow downward into a high-temperature gas hot melting section (4) of the dual heat carrier descending pyrolysis reactor (5) under the influence of pyrolysis dry gas; 300° C. to 600° C. high-temperature pyrolysis dry gas pressurized by a pressurized fan (26) and a pyrolysis dry gas heat exchanger (14) is injected into the high-temperature pyrolysis dry gas inner jacket, and uniformly sprayed out from a porous plate with an opening rate of 0.1% to 15%, thereby heating and melting the waste plastic fragments while preventing the plastic fragments from adhering to the inner wall of the dual heat carrier descending pyrolysis reactor (5) to form coke; the mixed pyrolysis dry gas carries The waste plastic melt flows downward to the high-temperature gas hot melting section (4) at the top of the dual heat carrier descending pyrolysis reactor (5), where it collides and mixes with the primary solid heat carrier that enters obliquely from the side, and a pyrolysis reaction occurs; the downward-flowing pyrolysis gas, heat carrier and waste plastic melt pass through the mixing internal components composed of the inner cavity guide plates of the dual heat carrier descending pyrolysis reactor (5) for multiple enhanced mixing and pyrolysis reactions, and then flows into the moving bed reactor (6) from one side of the top of the moving bed reactor (6), and the gas and solid are initially separated; the separated heat carrier containing the waste plastic melt further undergoes a pyrolysis reaction in the moving bed, and the pyrolysis oil vapor is further separated and purified by passing through the oil-gas separator (7) and then flows into the fractionation tower (8); the pyrolysis oil vapor is separated into wax oil and diesel in the fractionation tower (8). , gasoline and pyrolysis dry gas; an induced draft fan (12) is arranged at the pyrolysis dry gas outlet at the top of the fractionation tower (8); one dry gas is connected to the water-cooled feed pipe (3) as a carrying air, and the other dry gas is pressurized and heated by the pressure fan (26) and the pyrolysis dry gas heat exchanger (14) and then returned to the high-temperature pyrolysis dry gas inner jacket of the high-temperature gas hot melting section (4) at the upper part of the dual heat carrier descending pyrolysis reactor (5); the remaining dry gas is sent out as a product; the char-containing heat carrier at the bottom of the moving bed reactor (6) is added to the turbulent bed at the bottom of the riser heating regenerator (18) through the heat carrier return device (17) to be generated, and is fluidized and burned by the air added through the air inlet pipe (20) and the gas distributor (19); the generated flue gas and the carried heat carrier to be generated are passed through the riser heating regenerator (18) ) is further burned and heated on the upper part of the entrained bed, and large and medium-sized heat carriers are separated by the first-stage gas-solid separator (22) at the top of the riser heating regenerator (18), and then fine ash is separated by the second-stage gas-solid separator (24). After the flue gas recovers heat through the pyrolysis dry gas heat exchanger (14) and the waste heat boiler (15), the flue gas is discharged; the large and medium-sized heat carriers separated by the first-stage gas-solid separator (22) are circulated back to the solid heat carrier inlet at the upper part of the double heat carrier descending pyrolysis reactor (5) through the first-stage solid heat carrier return feeder (23) to participate in the rapid pyrolysis of the waste plastics; the fine ash separated by the second-stage gas-solid separator (24) is circulated back to the turbulent bed at the bottom of the riser heating regenerator (18) through the hot ash circulation pipe and the hot ash circulation return feeder (25).

[0028] The dual-heat-carrier circulation rapid pyrolysis device for producing fuel oil of waste plastics can continuously, on a large scale, efficiently and cleanly pyrolyze waste plastics, solving four common problems in the industry: adhesion and coking of waste plastic feed, difficulty in mixing with heat carriers, low yield of liquid products, and difficulty in scaling up pyrolysis devices. The liquid yield is over 88% (including liquefied gas), which is more than 15 percentage points higher than that of traditional waste plastic pyrolysis technology. It has high pyrolysis intensity, small equipment size, low steel consumption, greatly reduced fixed investment, and a simple ash removal process, thus achieving stable, long-term and optimal operation of the device.

Claims

1. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier circulation is composed of a waste plastic crusher, a controllable feeder, a dual heat carrier descending pyrolysis reactor, a moving bed reactor, a return device for the heat carrier to be generated, a riser heating regenerator, a gas distributor, an ash discharge pipe, an air inlet pipe, a first-stage gas-solid separator, a first-stage solid heat carrier return device, a second-stage gas-solid separator, a hot ash circulation pipe, an oil-gas separator, a fractionation tower, etc. Its technical characteristics are: The waste plastic pulverizer is connected to the water-cooled feed pipe at the top of the dual heat carrier descending pyrolysis reactor through a controllable feeder. The high-temperature gas hot melt section at the top of the dual heat carrier descending pyrolysis reactor is respectively connected to the pyrolysis dry gas heat exchanger and the first-stage solid heat carrier return feeder. The bottom of the dual heat carrier descending pyrolysis reactor is connected to the inner side of the top of the moving bed reactor; the outer side of the top of the moving bed reactor is connected to the distillation tower through an oil-gas separator; the bottom of the moving bed reactor is connected to the riser heating regenerator through a return feeder of the heat carrier to be generated; a gas distributor, an ash discharge pipe and an air inlet pipe are arranged at the bottom of the riser heating regenerator, and a first-stage gas-solid separator and a second-stage gas-solid separator are arranged at the top; the first stage The gas-solid separator is connected to the upper part of the dual heat carrier descending pyrolysis reactor through a first-stage solid heat carrier returner, and the ash outlet of the second-stage gas-solid separator is connected to the bottom of the riser heating regenerator through a hot ash circulation pipe and a hot ash circulation returner; the gas outlet of the second-stage gas-solid separator is provided with a pyrolysis dry gas heat exchanger and a waste heat boiler; the bottom and the upper part of the distillation tower are provided with a wax oil outlet, a diesel outlet and a gasoline outlet, and the pyrolysis dry gas outlet at the top of the tower is provided with an induced draft fan, one path of dry gas is connected to a water-cooled feed pipe, and the other path of dry gas is pressurized and heated by a booster fan and a pyrolysis dry gas heat exchanger and then returned to the upper part of the high-temperature gas hot melt section of the dual heat carrier descending pyrolysis reactor, and the remaining dry gas is sent out as a product.

2. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier cycles according to claim 1 is characterized in that A feed pipe with a water-cooling jacket is arranged on the top of a double heat carrier descending pyrolysis reactor, and the size is 0-100mm smaller than the reactor inner cavity; a high-temperature pyrolysis dry gas inner jacket with a thickness of 10mm-100mm is formed by the inner cavity and a porous plate with an opening rate of 0.1%-15% at the upper part of the reactor, and the jacket height is 0.5-4 times the equivalent diameter of the inner cavity; an inclined solid heat carrier inlet is arranged on the side of the upper part of the reactor, which is located 100-1500mm downward from the top of the reactor and has a horizontal downward angle of 0-85°; a mixed internal component composed of 1-10 guide plates with a horizontal downward inclination of 25°-85° is arranged in the reactor inner cavity, and adjacent guide plates are staggered at 180°, and the distance between the bottom end of the guide plate and the opposite inner cavity wall is 100-400mm.

3. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier cycles according to claim 1 is characterized in that The controllable feeder is a rotary feeder, a double-shaft screw feeder or a single-shaft screw feeder.

4. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier cycles according to claim 1 is characterized in that The controllable feeder is the upper part of the moving bed reactor, and its equivalent diameter is 1.2-4.0 times greater than that of the dual heat carrier descending pyrolysis reactor. The outlet and the oil and gas outlet of the dual heat carrier descending pyrolysis reactor are respectively installed on both sides of the top of the moving bed reactor; the bottom of the moving bed reactor is conical and directly connected to the return feeder of the heat carrier to be generated with a crushing function.

5. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier cycles according to claim 1 is characterized in that The riser heating regenerator is composed of a turbulent fluidized bed at the bottom and a carrying reactor at the top, the ratio of the equivalent diameter of the turbulent fluidized bed to the equivalent diameter of the carrying reactor is 2 to 3:1; the carrying reactor is a straight tube reactor with a uniform equivalent diameter, or is composed of large and small straight tubes with diameters of different multiples of the equivalent diameter connected by large and small head pipe fittings, and the diameter ratio of the large and small straight tubes is 1.2 to 2:1; the equivalent diameter of the fluidized bed is 10%-50% of the equivalent diameter of the turbulent fluidized bed.

6. The device for producing fuel oil by rapid pyrolysis of waste plastics with dual heat carrier cycles according to claim 1 is characterized in that The outlet temperature of the dual heat carrier descending pyrolysis reactor is 400-600℃, the reaction temperature at the bottom of the riser heating regenerator is 800-1200℃, the reaction temperature at the top outlet is 650-1000℃, and the temperature of the pyrolysis dry gas after heat exchange is 300℃-600℃.

Images