Device for preparing fuel oil by double-heat-carrier circulation fast pyrolysis of waste plastic

Abstract

The device for preparing fuel oil by double-heat-carrier circulation rapid pyrolysis of waste plastics comprises a waste plastic crusher, a down-flow pyrolysis reactor, a mobile bed reactor, a fractionating tower and a riser heating regenerator.

Description

1. TECHNICAL FIELD

[0001] The application provides a device for preparing fuel oil by double-heat-carrier circulation fast pyrolysis of waste plastic, and belongs to the field of environmental engineering. 2. BACKGROUND

[0002] The increasingly wide application of plastic resins brings great convenience to people's life, but also brings a large amount of white pollution. The use cycle of plastic is very short, and a large amount of plastic products, especially packaging materials, are discarded after about 6-12 months, and 40% of plastics are discarded after 1-2 years. The total annual output of waste plastics in the world has reached 50 million tons. In the past few decades, waste plastics have been treated as part of municipal solid waste (MSW). According to the survey, waste plastics account for 4%-10% (wt) or 10%-20% (v%) of MSW in industrialized countries, mainly from packaging waste, automobile waste and processing waste, and the percentage of each variety of waste plastics is: 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 and clean large-scale technology, waste plastics have become an environmental problem to be solved in the world.

[0003] In the treatment of urban plastic solid waste, at present, three methods of landfill, incineration and recycling are mainly used. Due to different national conditions, different countries have different methods. The United States mainly uses landfill, and Europe and Japan mainly use incineration.

[0004] (1) Landfill treatment is adopted, because plastic products are bulky, light in quality (65 kg / m 3 ), difficult to compress, not breathable, easy to expand and not easy to rot, which will cause the landfill site to become a soft foundation, causing water pollution, land occupation, sewer blockage and the like, so most developed countries strictly prohibit a large amount of plastic garbage from being treated by landfill.

[0005] (2) Burning heating or power generation treatment, plastic garbage is a chemical substance with high calorific value extracted from petroleum, and its average calorific value in domestic garbage is the highest. In order to make plastic garbage energy and economic, sending plastic garbage into the incinerator for burning can provide heat for heating or power generation, which is a solution, but considering that plastic garbage burning produces dioxin and fly ash pollution and the strong corrosive damage of chlorine gas released during burning, many environmental protection groups oppose burning plastic. At present, 200,000 tons of PVC garbage are burned in Germany every year, and 30% of them are burned in incinerators, which makes people anxious, and the law has to develop countermeasures. The Federal Environmental Protection Agency of Germany has stipulated that all incinerators must meet the limit of less than 0.1 ng (nanogram) per cubic meter of waste gas. Although the air pollution standard of incinerator in Germany has already belonged to the high standard recognized by the world, it still cannot be said that the burning method will not release harmful substances due to mechanical failure, so it can be predicted that environmental protection groups in various countries will still strongly oppose the burning method to recover heat energy.

[0006] (3) Recycling method, due to the high cost of labor and lack of corresponding recycling channels, the current world recycling rate is only about 15% of the total plastic consumption. However, considering the limited world oil resources, the recycling of plastics has great significance from the perspective of saving earth resources. Therefore, at present, various countries in the world invest a large amount of manpower and material resources to develop key technologies for recycling and utilizing waste plastics, and strive to develop suitable application fields for reducing the cost of plastic recycling.

[0007] Waste plastic thermal decomposition is an effective recycling method of placing waste plastic under anaerobic or low oxygen conditions and heating at high temperature to decompose and produce products with value, such as waste plastic pyrolysis liquefaction to produce gasoline, diesel oil, petroleum wax and other chemical raw materials. However, due to the characteristics of waste plastic, such as large size, light quality, difficult compression, poor gas permeability, easy expansion, easy melting and bonding, and poor heat conduction effect, it is difficult to solve the problems of continuous feeding and rapid heating. At present, most of the waste plastic pyrolysis liquefaction adopts batch reaction and horizontal rotary kiln reaction, the heating rate is slow, the feeding adhesion and coking are serious, the liquid product yield is low, the treatment capacity is difficult to improve, and the pyrolysis device is difficult to enlarge, which restricts the efficient and clean large-scale utilization of waste plastic. At present, there is no large-scale pyrolysis device for commercial operation, and it is urgent to develop continuous and rapid pyrolysis liquefaction process and equipment technology for waste plastic. 3. Summary

[0008] The purpose of the present application is to overcome the shortcomings of the existing waste plastic pyrolysis liquefaction technology and provide a waste plastic double heat carrier circulation rapid pyrolysis device for producing fuel oil. Through the reasonable utilization of pyrolysis dry gas at different temperatures and the combination of gas and solid heat carriers in two stages, the four industry common problems of waste plastic feeding adhesion and coking, mixing difficulty with heat carriers, low liquid product yield and difficulty in enlarging the pyrolysis device are solved.

[0009] The technical scheme of the present application:

[0010] The device for preparing fuel oil by waste plastic double-heat-carrier circulation rapid pyrolysis comprises a waste plastic crusher, a controllable feeder, a double-heat-carrier downward pyrolysis reactor, a moving bed reactor, a raw heat carrier return feeder, a lifting pipe 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 and a fractionating tower. The waste plastic crusher is connected with the water-cooled feeding pipe at the top of the double-heat-carrier downward pyrolysis reactor through the controllable feeder. The high-temperature gas hot melting section at the upper part of the double-heat-carrier downward pyrolysis reactor is connected with the pyrolysis dry gas heat exchanger and the first-stage solid heat carrier return feeder. The bottom of the double-heat-carrier downward pyrolysis reactor is connected with the inner side of the top of the moving bed reactor. The outer side of the top of the moving bed reactor is connected with the fractionating tower through the oil-gas separator. The bottom of the moving bed reactor is connected with the lifting pipe heating regenerator through the raw heat carrier return feeder. The bottom of the lifting pipe heating regenerator is provided with the gas distributor, the ash discharge pipe and the air inlet pipe. The top of the lifting pipe heating regenerator is provided with the first-stage gas-solid separator and the second-stage gas-solid separator. The first-stage gas-solid separator is connected with the upper part of the double-heat-carrier downward pyrolysis reactor through the first-stage solid heat carrier return feeder. The ash outlet of the second-stage gas-solid separator is connected with the bottom of the lifting pipe heating regenerator through the hot ash circulation pipe and the hot ash circulation return feeder. The gas outlet of the second-stage gas-solid separator is provided with the pyrolysis dry gas heat exchanger and the waste heat boiler. The bottom and the upper part of the fractionating tower are provided with the wax oil outlet, the diesel oil outlet and the gasoline outlet. The pyrolysis dry gas outlet at the top of the fractionating tower is provided with an induced draft fan. One way of dry gas is connected with the water-cooled feeding pipe as carrying air. Another way of dry gas is pressurized and heated through the pressurized air fan and the pyrolysis dry gas heat exchanger and then returned to the upper part of the high-temperature gas hot melting section of the double-heat-carrier downward pyrolysis reactor. The remaining dry gas is sent out as a product.

[0011] The top of the double-heat-carrier downward pyrolysis reactor is provided with a feeding pipe with a water-cooled jacket, and the size of the feeding pipe is 0-100 mm smaller than the inner cavity of the reactor. The upper part of the reactor is provided with a high-temperature pyrolysis dry gas inner jacket with a thickness of 10-100 mm and a porosity of 0.1%-15% formed by the inner cavity and the perforated plate. The height of the jacket is 0.5-4 times the equivalent diameter of the inner cavity. The side of the upper part of the reactor is provided with an inclined solid heat carrier inlet, which is located 100-1500 mm downward from the top of the reactor and has a horizontal angle of 0-85°. The inner cavity of the reactor is provided with mixed internal components composed of 1-10 guide plates with a downward inclination of 25°-85°. The adjacent guide plates are installed with a 180° staggered arrangement, and the bottom end of the guide plate is 100-400 mm away from the opposite inner cavity wall.

[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 double-heat-carrier downward pyrolysis reactor, and the outlet of the double-heat-carrier downward pyrolysis reactor and the oil gas outlet are respectively installed on the two sides of the top of the moving bed reactor; the bottom of the moving bed reactor is conical and directly connected to the spent heat carrier return device with a crushing function.

[0014] The riser heating regenerator is composed of a lower turbulent fluidized bed and an upper entraining reactor, the equivalent diameter of the turbulent fluidized bed is larger, and the equivalent diameter of the entraining reactor is smaller, and the diameter ratio is 2-3:1; the entraining reactor can be a straight pipe reactor with uniform equivalent diameter, or can be connected by a large head pipe fitting by a large straight pipe and a small straight pipe with different equivalent diameter multiples, and the diameter ratio of the large straight pipe and the small straight pipe is 1.2-2:1.

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

[0016] The characteristics of the present application will be described in detail in the examples. 4. BRIEF DESCRIPTION OF DRAWINGS

[0017] DRAWINGS Figure 1 It is a structural schematic diagram of the waste plastic double-heat-carrier circulating rapid pyrolysis device for preparing fuel oil.

[0018] The drawing surface is shown as follows:

[0019] 1, waste plastic crusher 2, controllable feeder 3, water-cooled feed pipe 4, high-temperature gas hot melting section 5, double-heat-carrier downward pyrolysis reactor 6, moving bed reactor 7, oil gas separator 8, fractionating column 9, wax oil outlet 10, diesel oil 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, spent heat carrier return device 18, riser heating regenerator 19, gas distributor 20, gas inlet pipe 21, ash discharge port 22, first-stage gas-solid separator 23, first-stage solid heat carrier return device 24, second-stage gas-solid separator 25, hot ash circulating return device 26, pressure fan

[0020] The process characteristics of the present application will be described in detail below in combination with the drawings and examples. 5. DETAILED DESCRIPTION

[0021] The device for preparing fuel oil by waste plastic double-heat carrier circulation fast pyrolysis is composed of a waste plastic crusher (1), a controllable feeder (2), a double-heat carrier downward pyrolysis reactor (5), a moving bed reactor (6), a spent heat carrier return feeder (17), a lifting pipe 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 feeder (23), a second-stage gas-solid separator (24), a hot ash circulation return feeder (25), an oil-gas separator (7), a fractionating column (8) and the like. The waste plastic crusher (1) is communicated with the water-cooled feeding pipe (3) at the top of the double-heat carrier downward pyrolysis reactor (5) through the controllable feeder (2), the high-temperature gas hot melting section (4) at the upper part of the double-heat carrier downward pyrolysis reactor (5) is communicated with the pyrolysis dry gas heat exchanger (14) and the first-stage solid heat carrier return feeder (23) respectively, and the bottom of the double-heat carrier downward pyrolysis reactor (5) is connected to the inner side at the top of the moving bed reactor (6); the outer side at the top of the moving bed reactor (6) is communicated with the fractionating column (8) through the oil-gas separator (7); the bottom of the moving bed reactor (6) is communicated with the lifting pipe heating regenerator (18) through the spent heat carrier return feeder (17); the bottom of the lifting pipe heating regenerator (18) is provided with the gas distributor (19), the ash discharge pipe (21) and the air inlet pipe (20), and the top is provided with the first-stage gas-solid separator (22) and the second-stage gas-solid separator (24); the first-stage gas-solid separator (22) is connected to the upper part of the double-heat carrier downward pyrolysis reactor (5) through the first-stage solid heat carrier return feeder (23), the ash outlet of the second-stage gas-solid separator (24) is communicated with the bottom of the lifting pipe heating regenerator (18) through the hot ash circulation pipe and the hot ash circulation return feeder (25); the gas outlet of the second-stage gas-solid separator (24) is provided with the pyrolysis dry gas heat exchanger (14) and the waste heat boiler (15); the bottom and the upper part of the fractionating column (8) are provided with the wax oil outlet (9), the diesel oil outlet (10) and the gasoline outlet (11), the top pyrolysis dry gas outlet of the fractionating column (8) is provided with the induced draft fan (12), one way of dry gas is connected with the water-cooled feeding pipe (3), another way of dry gas is pressurized and heated through the pressurized fan (26) and the pyrolysis dry gas heat exchanger (14) and then returned to the upper part of the high-temperature gas hot melting section (4) of the double-heat carrier downward pyrolysis reactor (5), and the remaining dry gas is sent out as a product.

[0022] The top of the double-heat-carrier downward pyrolysis reactor (5) is provided with a feed pipe with a water-cooled jacket, the size of which is 0-100 mm smaller than the inner cavity of the reactor; in the upper part of the reactor, a high-temperature pyrolysis dry gas inner jacket with a thickness of 10-100 mm is formed by the inner cavity and a porous plate with an open area of 0.1%-15%; the height of the jacket is 0.5-4 times the equivalent diameter of the inner cavity; the side of the upper part of the reactor is provided with an inclined solid heat carrier inlet, which is located 100-1500 mm downward from the top of the reactor and has a horizontal downward angle of 0-85°; the inner cavity of the reactor is provided with mixing inner components composed of 1-10 guide plates with a downward inclination of 25°-85°, the adjacent guide plates are installed in a staggered manner at an angle of 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 part of the moving bed reactor (6) is 1.2-4.0 times larger than that of the double-heat-carrier downward pyrolysis reactor (5); the outlet of the double-heat-carrier downward pyrolysis reactor (5) and the oil gas outlet are respectively installed on the two 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 spent heat carrier return feeder (17) with a crushing function.

[0025] The riser heating regenerator (18) is composed of a lower turbulent fluidized bed and an upper entrained reactor; the equivalent diameter of the turbulent fluidized bed is larger, and the equivalent diameter of the entrained reactor is smaller, and the diameter ratio is 2-3:1; the entrained reactor can be a straight pipe reactor with a uniform equivalent diameter, or it can be connected by a size head pipe fitting by a large straight pipe and a small straight pipe with different equivalent diameters, and the diameter ratio of the large straight pipe to the small straight pipe is 1.2-2:1; the equivalent diameter of the gas flow bed is only 10%-50% of the equivalent diameter of the turbulent fluidized bed.

[0026] The outlet temperature of the double-heat-carrier downward pyrolysis reactor (5) is 400-600℃; the reaction temperature at the bottom of the riser heating regenerator (18) 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℃.

[0027] Specific operation, the waste plastics are first crushed by a waste plastic crusher (1), and then the waste plastic pieces of 0-30 mm are added into a water-cooled feeding pipe with a water-cooled jacket at the top of a double-heat-carrier downward pyrolysis reactor (5) by a controllable feeder (2), and flow downward into a high-temperature gas hot melting section (4) of the double-heat-carrier downward pyrolysis reactor (5) under the carrying of dry pyrolysis gas; the dry pyrolysis gas with a high temperature of 300-600 DEG C pressurized by a pressurizing fan (26) and a dry pyrolysis gas heat exchanger (14) is injected into an inner jacket of the high-temperature dry pyrolysis gas, and is uniformly sprayed from a porous plate with an opening rate of 0.1%-15% to heat and melt the waste plastic pieces while preventing the plastic pieces from adhering to the inner wall of the double-heat-carrier downward pyrolysis reactor (5) to form coking; the mixed dry pyrolysis gas carries the waste plastic melt to flow downward to the high-temperature gas hot melting section (4) at the upper part of the double-heat-carrier downward pyrolysis reactor (5), collides with the first-stage solid heat carrier which enters from the side, and pyrolysis reaction occurs; the downward flowing pyrolysis gas, heat carrier and waste plastic melt are subjected to multiple intensified mixing and pyrolysis reaction by the mixed inner member composed of the inner cavity guide plate group of the double-heat-carrier downward pyrolysis reactor (5), and flow into a moving bed reactor (6) from one side at the top of the moving bed reactor (6) to preliminarily separate the gas and solid; the separated heat carrier containing the waste plastic melt further undergoes pyrolysis reaction in the moving bed, and the pyrolysis oil gas is further separated and purified by passing through an oil gas separator (7) and then flows into a fractionating column (8); the pyrolysis oil gas is separated into wax oil, diesel oil, gasoline and dry pyrolysis gas in the fractionating column (8); an induced draft fan (12) is arranged at the dry pyrolysis gas outlet at the top of the fractionating column (8), one way of the dry gas is connected with the water-cooled feeding pipe (3) to serve as carrying air, another way of the dry gas is pressurized and heated by the pressurizing fan (26) and the dry pyrolysis gas heat exchanger (14) and then returns to the high-temperature dry pyrolysis gas inner jacket at the high-temperature gas hot melting section (4) at the upper part of the double-heat-carrier downward pyrolysis reactor (5), and the remaining dry gas is sent out as a product; the coking heat carrier at the bottom of the moving bed reactor (6) is added into a turbulent bed at the bottom of a riser heating regenerator (18) by a spent heat carrier return feeder (17), is fluidized and combusted by the air added by an air inlet pipe (20) and a gas distributor (19); the generated flue gas and the carried spent heat carrier are further combusted and heated by a carrying bed at the upper part of the riser heating regenerator (18), and after the large and medium particle heat carriers are separated out by a first-stage gas-solid separator (22) at the top of the riser heating regenerator (18), fine ash is separated out by a second-stage gas-solid separator (24), the flue gas is discharged after recovering heat by the dry pyrolysis gas heat exchanger (14) and a waste heat boiler (15); the large and medium particle heat carriers separated out 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 downward pyrolysis reactor (5) by a first-stage solid heat carrier return feeder (23) to participate in the rapid pyrolysis of the waste plastics; the fine ash separated out by the second-stage gas-solid separator (24) is circulated back to the turbulent bed at the bottom of the riser heating regenerator (18) by a hot ash circulating pipe and a hot ash circulating return feeder (25).

[0028] The device for preparing fuel oil by double-heat-carrier circulation fast pyrolysis of waste plastics can continuously, massively and efficiently pyrolyze waste plastics, and solves four common problems in the industry, i.e., adhesion and coking of waste plastic feed, difficulty in mixing with heat carriers, low liquid product yield and difficulty in scaling up of pyrolysis device. The liquid yield is more than 88% (including liquefied gas), which is more than 15 percentage points higher than that of traditional waste plastic pyrolysis technology. The pyrolysis intensity is high, the equipment volume is small, the steel consumption is low, the fixed investment is greatly reduced, the ash discharge process is simple, and stable, long and full operation of the device is realized.

Claims

1. A device for producing fuel oil by double heat carrier circulation rapid pyrolysis of waste plastics, which is composed of a waste plastics crusher, a controllable feeder, a double heat carrier downward pyrolysis reactor, a moving bed reactor, a spent heat carrier return feeder, 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 and a fractional distillation column, and is characterized in that The waste plastic crusher is connected with the water-cooled feeding pipe at the top of the double-heat-carrier downward pyrolysis reactor through a controllable feeder, the high-temperature gas hot melting section at the upper part of the double-heat-carrier downward pyrolysis reactor is connected with the dry gas heat exchanger and the first-stage solid heat carrier return feeder respectively, and the bottom of the double-heat-carrier downward pyrolysis reactor is connected with the inner side of the top of the moving bed reactor.

2. The apparatus for producing fuel oil from waste plastics by double-heat-carrier circulation rapid pyrolysis according to claim 1, characterized in that The outer side of the top of the moving bed reactor is connected with the fractionating column through an oil-gas separator.

3. The apparatus for producing fuel oil from waste plastics by double-heat carrier cycle rapid pyrolysis according to claim 1, characterized in that The bottom of the moving bed reactor is connected with the riser heating regenerator through the spent heat carrier return feeder. The bottom of the riser heating regenerator is provided with a gas distributor, an ash discharge pipe and an air inlet pipe, and the top is provided with a first-stage gas-solid separator and a second-stage gas-solid separator. The first-stage gas-solid separator is connected with the upper part of the double-heat-carrier downward pyrolysis reactor through the first-stage solid heat carrier return feeder, 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 return feeder. The gas outlet of the second-stage gas-solid separator is provided with the dry gas heat exchanger and the waste heat boiler. The bottom and the upper part of the fractionating column are provided with a wax oil outlet, a diesel oil outlet and a gasoline outlet, the dry gas outlet at the top of the fractionating column is provided with an induced draft fan, one way of dry gas is connected with the water-cooled feeding pipe, another way of dry gas is pressurized and heated through the pressurized fan and the dry gas heat exchanger and then returned to the upper part of the high-temperature gas hot melting section of the double-heat-carrier downward pyrolysis reactor, and the remaining dry gas is sent out as a product. The top of the double-heat-carrier downward pyrolysis reactor is provided with a feeding pipe with a water-cooled jacket, the upper part of the reactor is provided with a high-temperature dry gas inner jacket formed by the inner cavity and the porous plate with a 0.1%-15% opening rate and a thickness of 10mm-100mm, and the height of the jacket is 0.5-4 times of the equivalent diameter of the inner cavity. The side of the upper part of the reactor is provided with an inclined solid heat carrier inlet located 100-1500mm downward from the top of the reactor. The inner cavity of the reactor is provided with mixed internal components composed of horizontal downward inclined baffles with an inclination of 25°-85°, the adjacent baffles are relatively staggered, and the bottom end of the baffle is 100-400mm away from the opposite inner cavity wall. The high-temperature dry gas is injected into the high-temperature dry gas inner jacket and uniformly sprayed from the porous plate with a 0.1%-15% opening rate, thereby heating and melting the waste plastic fragments while preventing the plastic fragments from adhering to the inner wall of the double-heat-carrier downward pyrolysis reactor to form coking. The mixed dry gas carries the waste plastic melting liquid downward to the high-temperature gas hot melting section at the upper part of the double-heat-carrier downward pyrolysis reactor, collides and mixes with the first-stage solid heat carrier entering from the side, and pyrolysis reaction occurs. The downward flowing pyrolysis gas, heat carrier and waste plastic melting body pass through the mixed internal components composed of the baffle group in the inner cavity of the double-heat-carrier downward pyrolysis reactor for multiple times of intensive mixing and pyrolysis reaction. The bottom of the moving bed reactor is conical and directly connected with the spent heat carrier return feeder with a crushing function. The riser heating regenerator is composed of a lower turbulent fluidized bed and an upper carrying reactor, the ratio of the equivalent diameter of the turbulent fluidized bed to the equivalent diameter of the carrying reactor is 2-3:

1. The carrying reactor is a straight pipe reactor with uniform equivalent diameter, or is connected by a size head pipe through large and small straight pipes with different equivalent diameter multiples, and the diameter ratio of the large and small straight pipes is 1.2-2:

1.

4. The apparatus for producing fuel oil from waste plastics by double-heat carrier cycle rapid pyrolysis according to claim 1, characterized in that The outlet temperature of the double-heat-carrier down-flow 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 ℃.

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