Cotton stalk microwave pyrolysis reaction system

Abstract

The cotton straw microwave cracking reaction system provided by the application can adjust the output by increasing or decreasing the number of microwave cracking reactors, the height-diameter ratio of the straight section in the microwave reaction bin is designed to be 2.6-3.3, and the raw material distributor and the secondary distributor are arranged in the microwave reaction bin, so that the uniform distribution of the material is ensured and the high-temperature gas is prevented from taking the material; in addition, the metal shell is arranged outside the microwave reaction bin, so that the safety risk caused by the cracks or burst of the furnace body is avoided, the metal shell has a reflection weakening effect on the microwave, the microwave resonant cavity is completely closed by the metal shell top cover and the lower end sealing support ring, and the leakage amount of the microwave is further reduced; then, the microwave intensity controller is used to monitor and control the microwave intensity in the microwave resonant cavity, and the material level regulator is used to monitor and control the material level in the microwave reaction bin, so that the output microwave power and the feeding amount are matched, and the anti-sticking stirrer does not stop.

Description

Technical Field

[0001] This invention belongs to the field of microwave pyrolysis equipment technology, and particularly relates to a microwave pyrolysis reaction system for cotton stalks. Background Technology

[0002] The energy conversion of cotton stalks utilizes microwaves as an external heat or radiation source to reach the critical temperature inside the pyrolysis device, breaking and pyrolyzing the chemical bonds in the cotton stalks to form other degradable or recyclable small-molecule organic or inorganic substances. The combustible gas generated after the reaction can be used to produce artificial natural gas and methanol; the biochar generated after the reaction can be activated to produce wood-based decolorizing activated carbon.

[0003] The prior patent application, application number ZL 201420766724.2, entitled "A Microwave Pyrolysis Furnace," discloses the following: its design consists of a furnace body, a furnace bottom, a ceramic stirring rod, a stainless steel spiral discharge device, a microwave energy feed tube assembly, and two or more thermocouples. The furnace body and the furnace bottom are connected and integrally formed to constitute the furnace body. The ceramic stirring rod is located inside the furnace body and installed at the bottom of the furnace body. The stainless steel spiral discharge device is located inside the furnace bottom. The microwave energy feed waveguide assembly is installed on the furnace body and partially located inside the furnace body. The thermocouples are located on the side wall of the furnace body and close to the ceramic stirring rod.

[0004] The application, numbered ZL201110426763.9 and named "Waste Microwave Pyrolysis Furnace," proposes a scheme in which a spiral agitator is installed inside the furnace chamber of the microwave pyrolysis furnace. The furnace chambers of two adjacent microwave pyrolysis furnaces are connected vertically, and the spiral agitators installed in each microwave pyrolysis furnace are connected in series in stages.

[0005] The above technical solutions have the following technical defects and shortcomings:

[0006] ① The material in the furnace body has a long residence time from top to bottom. As the generated pyrolysis gas reaches the top of the furnace body from bottom to top, the gas volume and flow rate are large, making it very easy for gas to carry material.

[0007] ②The furnace body has no protective shell. When the furnace body is subjected to external environmental influences under high temperature and high pressure inside, it is very easy to crack or burst, which will cause safety production accidents. At the same time, the microwaves emitted by the microwave energy feed tube assembly will pass through the furnace body and radiate to the outside, causing environmental radiation pollution.

[0008] ③ In addition, a ceramic stirring rod is installed in the high-temperature reaction zone of the furnace body to agitate the materials. When the microwave power output by the microwave energy fed into the waveguide component does not match the feed rate, the ceramic stirring rod may fail to operate normally, thus affecting safe production.

[0009] Therefore, there is an urgent need for a microwave pyrolysis reaction system suitable for cotton stalks that can solve the above-mentioned technical problems. Summary of the Invention

[0010] To address the shortcomings and deficiencies of existing technologies, a microwave pyrolysis reaction system for cotton stalks is provided. This system can solve the problems in existing technologies, such as the pyrolysis gas generated in the furnace body easily carrying material upwards, the lack of a protective shell on the outside of the furnace body easily causing cracks or explosions, the environmental radiation pollution caused by microwaves passing through the furnace body, and the mismatch between the output microwave power and the feed rate easily causing the stirring rod to malfunction.

[0011] A microwave pyrolysis reaction system for cotton stalks, provided to achieve the purpose of this invention, includes multiple microwave pyrolysis reactors arranged in parallel. The bottom of each microwave pyrolysis reactor is connected to a biomass char screw conveyor via a pipeline to collect the biomass char obtained in the microwave pyrolysis reactor. The end of the biomass char screw conveyor transports the biomass char to a biomass char transport vehicle via a pipeline.

[0012] As a further improvement to the above scheme, the microwave pyrolysis reactor includes a microwave reaction chamber, which includes a top cover, a straight section, and an inclined tail section. The height-to-diameter ratio of the straight section in the microwave reaction chamber is 2.6 to 3.3. A metal shell is fitted over the straight section in the microwave reaction chamber, and the metal shell includes a metal shell top cover. A microwave resonant cavity is formed between the outer wall of the straight section in the microwave reaction chamber, the inner cavity of the metal shell, and the metal shell top cover. A heat insulation layer is provided on the outer wall of the metal shell. The top of the microwave reaction chamber is connected to the raw material silo via a pipeline. The system is designed to transport raw materials into the microwave reaction chamber. The top of the microwave reaction chamber has a reaction gas outlet to discharge the gases produced by the microwave reaction. Multiple microwave inlets, staggered in height on opposite sides of the sidewall of the metal casing, are used to introduce microwave energy into the microwave resonant cavity. Inside the straight section of the microwave reaction chamber, from top to bottom, are a raw material distributor and a secondary distributor, ensuring that the cotton stalk material is evenly distributed within the microwave reaction chamber. The bottom of the inclined tail section of the microwave reaction chamber is connected to the biomass charcoal screw discharge machine via a pipeline.

[0013] As a further improvement to the above solution, an upper sealing support ring is provided between the inner wall of the metal shell top cover and the upper part of the straight section of the microwave reaction chamber to support the vertical stability of the microwave reaction chamber. A lower sealing support ring is provided between the bottom surface of the inner cavity of the metal shell and the lower part of the straight section of the microwave reaction chamber to support the stability of the microwave reaction chamber and the bottom surface of the metal shell and to ensure the sealing of the microwave resonant cavity. The combination of the metal shell top cover, the outer side of the microwave reaction chamber and the lower sealing support ring forms a sealed space for the microwave resonant cavity.

[0014] As a further improvement to the above solution, a nitrogen inlet and a nitrogen outlet are provided on the outside of the metal casing to introduce nitrogen into the microwave resonant cavity for safe operation. A combustible gas monitor is also provided on the outside of the metal casing, with its end inserted into the microwave resonant cavity to monitor the sealed operation status inside the microwave resonant cavity.

[0015] As a further improvement to the above scheme, an anti-sticking stirrer is installed in the inclined tail section of the microwave reaction chamber to break up the weakly sticky biochar generated after the microwave reaction, so as to avoid clumping and blockage.

[0016] As a further improvement to the above scheme, a loose gas inlet is provided on the inclined tail section of the microwave reaction chamber to blow the microwave-generated and treated gas into the bottom of the microwave reaction chamber, so as to make the biochar loose to ensure smooth discharge and not affect the composition of the reaction gas.

[0017] As a further improvement to the above scheme, a biomass char discharge machine is installed on the pipeline connecting the inclined tail section of the microwave reaction chamber to the biomass char screw discharge machine, in order to quantitatively discharge the biomass char collected by the biomass char screw discharge machine.

[0018] As a further improvement to the above scheme, the straight section of the microwave reaction chamber is divided into three reaction zones: upper, middle, and lower. Three temperature measuring devices are installed on the top of the microwave reaction chamber, and the ends of the three temperature measuring devices are respectively placed in the upper, middle, and lower reaction zones within the straight section of the microwave reaction chamber, thereby enabling monitoring of the temperature in the upper, middle, and lower reaction zones.

[0019] As a further improvement to the above solution, a pressure measuring device is also installed on the top of the microwave reaction chamber for monitoring the pressure inside the microwave reaction chamber, and a material level regulator is also installed on the side wall of the microwave reaction chamber for monitoring the material level in the microwave reaction chamber.

[0020] As a further improvement to the above solution, a microwave intensity controller is also provided on the side wall of the metal shell to monitor the microwave intensity inside the microwave resonant cavity.

[0021] The beneficial effects of this invention are:

[0022] Compared with the prior art, the present invention provides a microwave pyrolysis reaction system for cotton stalks. After processing, cotton stalks of a certain particle size are uniformly mixed with microwave absorbing material and then fed into the microwave reaction chamber from the raw material silo. The material in the microwave reaction chamber is directly heated by microwaves. After the material passes through the upper, middle and lower reaction zones in the microwave reaction chamber, the generated high-temperature gas is discharged from the reaction gas outlet. The biochar produced after the reaction enters the bottom of the inclined tail section of the microwave reaction chamber and is then discharged.

[0023] ① This device can adjust the unit output by increasing or decreasing the number of microwave pyrolysis reactors while keeping the total output constant. In addition, considering the common microwave wavelength of 2450MHz, the height-to-diameter ratio of the straight section in the microwave reaction chamber is designed to be 2.6 to 3.3. Furthermore, a raw material distributor and a secondary distributor are installed in the microwave reaction chamber, which not only ensures that the material is evenly distributed in the microwave reaction chamber, but also effectively prevents the high-temperature gas from carrying material during the rising process.

[0024] ② This device has a metal shell surrounding the microwave reaction chamber, which avoids the safety risks caused by cracks or explosions in the furnace body. At the same time, the metal shell has a reflective and weakening effect on microwaves, so that very little microwave passes through the furnace body and enters the outside. In addition, the microwave resonant cavity is completely sealed by the top cover and the lower sealing support ring of the metal shell, thereby further reducing the amount of microwave leakage.

[0025] ③ This device monitors and controls the microwave intensity in the microwave resonant cavity through a microwave intensity controller and monitors and controls the material level in the microwave reaction chamber through a material level regulator, so that the output microwave power is matched with the feed rate, and the anti-stick agitator will not stop.

[0026] ④ This device can be filled with nitrogen in the microwave resonant cavity and is equipped with a combustible gas monitor. In addition, temperature and pressure measuring instruments are installed on the microwave reaction chamber, thereby strengthening safety protection measures. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a partial cross-sectional schematic diagram of the reactor in this invention;

[0029] Figure 3 This is a top view of the raw material feeder in this invention;

[0030] Figure 4 This is a top view of the secondary fabric feeder in this invention.

[0031] The components are as follows: 1-Microwave reaction chamber; 2-Microwave resonant cavity; 3-Raw material feeder; 4-Raw material silo; 5-Metal outer shell; 6-Microwave inlet; 7-Insulation layer; 8-Biomass charcoal discharge machine; 9-Biomass charcoal screw discharge machine; 10-Top cover; 11-Loose gas inlet; 12-Secondary distributor; 13-Raw material distributor; 14-Nitrogen inlet; 15-Reaction gas outlet; 16-Nitrogen outlet; 17-Anti-stick agitator; 21-Metal outer shell top cover; 22-Upper sealing support ring; 23-Lower sealing support ring; 31-Microwave intensity controller; 32-Material level regulator; 33-Combustible gas monitor; 34-Temperature measuring device; 35-Pressure measuring device. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0033] according to Figure 1 As shown, the present invention provides a microwave pyrolysis reaction system for cotton stalks, including multiple microwave pyrolysis reactors arranged in parallel. The bottom of each microwave pyrolysis reactor is connected to a biomass char screw discharge machine 9 through a pipeline to collect the biomass char obtained in the microwave pyrolysis reactor. The end of the biomass char screw discharge machine 9 is then transported to a biomass char transport vehicle through a pipeline.

[0034] according to Figures 2-4 As shown, the microwave pyrolysis reactor includes a microwave reaction chamber 1, which includes a top cover 10, a straight section, and an inclined tail section. The height-to-diameter ratio of the straight section in the microwave reaction chamber 1 is 2.6–3.3. A metal shell 5 is fitted over the straight section in the microwave reaction chamber 1. The metal shell 5 includes a metal shell top cover 21. A microwave resonant cavity 2 is formed between the outer wall of the straight section in the microwave reaction chamber 1, the inner cavity of the metal shell 5, and the metal shell top cover 21. A heat insulation layer 7 is provided on the outer wall of the metal shell 5. The top of the microwave reaction chamber 1 is connected to the raw material silo 3 through a pipeline to achieve the desired temperature and humidity. Raw materials are transported into the microwave reaction chamber 1. The top of the microwave reaction chamber 1 is equipped with a reaction gas outlet 15 to discharge the gas after microwave reaction. Multiple microwave inlets 6 are arranged at different heights on the side wall of the metal shell 5 to introduce microwave energy into the microwave resonant cavity 2. The straight section of the microwave reaction chamber 1 is equipped with a raw material distributor 13 and a secondary distributor 12 from top to bottom, so that the cotton straw material is evenly distributed in the microwave reaction chamber 1. The bottom of the inclined tail section of the microwave reaction chamber 1 is connected to the biomass charcoal screw discharge machine 9 through a pipeline.

[0035] An upper sealing support ring 22 is provided between the inner wall of the metal shell top cover 21 and the upper part of the straight section of the microwave reaction chamber 1 to support the vertical stability of the microwave reaction chamber 1. A lower sealing support ring 23 is provided between the bottom surface of the inner cavity of the metal shell 4 and the lower part of the straight section of the microwave reaction chamber 1 to support the stability of the microwave reaction chamber 1 and the bottom surface of the metal shell 4 and to ensure the sealing of the microwave resonant cavity 2. The combination of the metal shell top cover 21, the outer side of the microwave reaction chamber 1 and the lower sealing support ring 23 forms a sealed space for the microwave resonant cavity 2.

[0036] Meanwhile, the metal casing 5 is provided with a nitrogen inlet 14 and a nitrogen outlet 16 on its exterior to introduce nitrogen into the microwave resonant cavity 2 to protect safe operation. The metal casing 5 is also provided with a combustible gas monitor 33, the end of which is inserted into the microwave resonant cavity 2 to monitor the sealed operation status inside the microwave resonant cavity 2.

[0037] In addition, an anti-sticking stirrer 17 is installed in the inclined tail section of the microwave reaction chamber 1 to break up the weakly sticky biochar generated after the microwave reaction, preventing clumping and blockage. A loosening gas inlet 11 is installed on the inclined tail section of the microwave reaction chamber 1 to blow the treated gas generated by the microwave reaction into the bottom of the microwave reaction chamber 1, making the biochar loose to ensure smooth discharge and not affect the composition of the reaction gas. A biochar discharge machine 8 is installed on the pipeline connecting the inclined tail section of the microwave reaction chamber 1 to the biochar screw discharge machine 9, to quantitatively collect the biochar collected by the biochar screw discharge machine 9.

[0038] Furthermore, the microwave reaction chamber 1 is divided into three reaction zones: upper, middle, and lower. Three temperature measuring devices 34 are installed on the top of the microwave reaction chamber 1. The ends of the three temperature measuring devices 34 are respectively placed in the upper, middle, and lower reaction zones within the upper, middle, and lower reaction zones of the microwave reaction chamber 1, thereby enabling temperature monitoring within the upper, middle, and lower reaction zones.

[0039] Finally, a pressure measuring device 35 is installed on the top of the microwave reaction chamber 1 to monitor the pressure inside the microwave reaction chamber 1. A material level regulator 32 is also installed on the side wall of the microwave reaction chamber 1 to monitor the material level in the microwave reaction chamber 1. A microwave intensity controller 31 is also installed on the side wall of the metal shell 5 to monitor the microwave intensity inside the microwave resonant cavity 2.

[0040] This invention provides a microwave pyrolysis reaction system for cotton stalks, the operation of which is as follows:

[0041] 1. The raw material in the raw material silo 4 is qualified cotton stalk material that has been cut into a certain particle size and mixed with microwave absorbing material in a certain proportion. The cotton stalk material after the above treatment is controlled and metered by the raw material feeder 3 and enters the microwave reaction chamber 1 through the pipeline. It is evenly distributed in the microwave reaction chamber 1 by the raw material distributor 13 and the secondary distributor 12. The amount of material fed into the microwave reaction chamber 1 is automatically controlled by the material level regulator 32.

[0042] 2. Nitrogen gas is introduced into the microwave resonant cavity 2, and the airtightness of the microwave resonant cavity 2 is monitored by the combustible gas monitor 33 to ensure that the pressure value inside the microwave resonant cavity 2 is stable. The microwave generated by the microwave generator is transmitted through the waveguide and fed into the microwave resonant cavity 2 through the microwave inlet 6. The microwave passes through the outer wall of the microwave reaction chamber 1. The microwave entering the microwave reaction chamber 1 is absorbed by the microwave absorbing material in the cotton straw material, thereby increasing its temperature and reacting. The microwave intensity provided is monitored by the microwave intensity controller 31 to meet the temperature required for the reaction of the cotton straw material.

[0043] 4. In the microwave reaction chamber 1, the straight section is divided into three reaction zones: upper, middle, and lower. The first zone is for preheating raw materials and evaporating moisture, ranging from room temperature to 290℃; the second zone is for vigorous reaction, ranging from 290℃ to 650℃; and the third zone is for continuous reaction at a constant temperature, ranging from 650℃ to 750℃. The temperature of all three reaction zones is monitored by a temperature measuring device 34. After the reaction is completed, the generated high-temperature gas is discharged from the reaction gas outlet 15, and the generated biochar enters the inclined tail section of the microwave reaction chamber 1. After being broken up by the anti-sticking stirrer 17, the biochar passes through the biochar discharge machine 8. The biochar discharge machine 8 discharges the biochar according to the cumulative feed amount from the raw material feeder 3, so that the biochar enters the biochar screw discharge machine 9 and is then transported to the outlet into the biochar transport vehicle for transport out of the reaction zone.

[0044] Firstly, this device can adjust the unit output by increasing or decreasing the number of microwave pyrolysis reactors while maintaining the overall output. Furthermore, considering the commonly used microwave wavelength of 2450MHz, the height-to-diameter ratio of the straight section in the microwave reaction chamber 1 is designed to be 2.6–3.3. A raw material distributor 13 and a secondary distributor 12 are installed inside the microwave reaction chamber 1, ensuring uniform material distribution while effectively preventing material carryover during the rising process of high-temperature gas. Secondly, a metal outer shell 5 is installed outside the microwave reaction chamber 1, avoiding safety risks caused by cracks or explosions in the furnace body. The metal outer shell 5 also reflects and weakens microwaves, minimizing the amount of microwaves passing through the furnace body and entering the outside. Additionally, the top cover 21 and the lower sealing support ring 23 of the metal outer shell completely enclose the microwave resonant cavity 2, further reducing microwave leakage. Secondly, the microwave intensity in the microwave resonant cavity 2 is monitored and controlled by the microwave intensity controller 31, and the material level in the microwave reaction chamber 1 is monitored and controlled by the material level regulator 32, so that the output microwave power is matched with the feed rate, preventing the anti-stick agitator 17 from stopping. Finally, nitrogen can be filled into the microwave resonant cavity 2, and a combustible gas monitor 33 is installed. In addition, a temperature measuring device 34 and a pressure measuring device 35 are installed on the microwave reaction chamber 1, thereby strengthening the safety protection measures.

[0045] In summary, this device has a simple structure, few rotating parts, and can control the feed rate according to the material level, control the microwave power entering the microwave reaction chamber 1 according to the microwave intensity, and control the output rate of the biochar after the reaction is completed according to the feed rate, thus realizing automated control from feeding to discharging.

[0046] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the technical solutions of the present invention.

Claims

1. A cotton stalk microwave pyrolysis reaction system, characterized in that: The application relates to a microwave pyrolysis reactor, which comprises a plurality of parallel microwave pyrolysis reactors, the bottoms of the microwave pyrolysis reactors are communicated with a biomass charcoal screw discharging machine (9) through pipelines to collect the biomass charcoal obtained in the microwave pyrolysis reactors, the tail end of the biomass charcoal screw discharging machine (9) is communicated with a biomass charcoal transport vehicle through a pipeline to transport the biomass charcoal into the biomass charcoal transport vehicle, the microwave pyrolysis reactor comprises a microwave reaction bin (1), the microwave reaction bin (1) comprises an upper cover (10), a straight section and an inclined tail section, the height-diameter ratio of the straight section of the microwave reaction bin (1) is 2.6-3.3, the straight section of the microwave reaction bin (1) is sleeved with a metal shell (5) outside, the metal shell (4) comprises a metal shell top cover (21), a microwave resonance cavity (2) is formed between the outer wall of the straight section of the microwave reaction bin (1), the inner cavity of the metal shell (5) and the metal shell top cover (21), a heat preservation layer (7) is arranged on the outer wall of the metal shell (5), the top of the microwave reaction bin (1) is communicated with a raw material bin (3) through a pipeline to transport raw materials into the microwave reaction bin (1), a reaction gas outlet (15) is arranged on the top of the microwave reaction bin (1) to discharge the gas after microwave reaction, a plurality of microwave inlets (6) are arranged on the side wall of the metal shell (5) in a staggered manner in the opposite directions to input microwave energy into the microwave resonance cavity (2), a raw material distributor (13) and a secondary distributor (12) are sequentially arranged in the straight section of the microwave reaction bin (1) from top to bottom, so that the cotton straw materials are uniformly distributed in the microwave reaction bin (1), the bottom of the inclined tail section of the microwave reaction bin (1) is communicated with the biomass charcoal screw discharging machine (9) through a pipeline, a pressure measurer (35) is further arranged on the top of the microwave reaction bin (1) to monitor the pressure in the microwave reaction bin (1), a material level regulator (32) is further arranged on the side wall of the microwave reaction bin (1) to monitor the material level of the microwave reaction bin (1), a microwave intensity controller (31) is further arranged on the side wall of the metal shell (5) to monitor the microwave intensity in the microwave resonance cavity (2), an anti-sticking stirrer (17) is arranged in the inclined tail section of the microwave reaction bin (1) to break the weakly adhesive biomass charcoal generated after microwave reaction to avoid clogging, the microwave intensity in the microwave resonance cavity (2) is monitored and controlled through the microwave intensity controller (31), the material level in the microwave reaction bin (1) is monitored and controlled through the material level regulator (32), so that the output microwave power is matched with the feeding amount, and the anti-sticking stirrer (17) does not stop.

2. The cotton stalk microwave pyrolysis reaction system according to claim 1, characterized in that: The inner wall of the metal shell top cover (21) and the upper part of the straight section of the microwave reaction chamber (1) are provided with an upper end sealing support ring (22) for supporting the vertical stability of the microwave reaction chamber (1), the bottom surface of the inner cavity of the metal shell (4) and the lower part of the straight section of the microwave reaction chamber (1) are provided with a lower end sealing support ring (23) for supporting the stability of the microwave reaction chamber (1) and the bottom surface of the metal shell (4) and ensuring the sealing of the microwave resonant cavity (2), the combination of the metal shell top cover (21), the outer side of the microwave reaction chamber (1) and the lower end sealing support ring (23) realizes the formation of a closed space for the microwave resonant cavity (2).

3. The cotton stalk microwave pyrolysis reaction system according to claim 2, characterized in that: The outside of the metal shell (5) is provided with a nitrogen inlet (14) and a nitrogen outlet (16) to introduce nitrogen into the microwave resonant cavity (2) to protect the safe operation, and the outside of the metal shell (5) is also provided with a combustible gas monitor (33), the end of which is inserted into the microwave resonant cavity (2) to monitor the closed operation condition in the microwave resonant cavity (2).

4. The cotton stalk microwave pyrolysis reaction system according to claim 3, characterized in that: The microwave reaction chamber (1) is provided with a loose gas inlet (11) on the inclined tail section, which is used to blow the gas generated by the microwave reaction into the bottom of the microwave reaction chamber (1) after treatment, so that the biomass charcoal becomes loose to ensure smooth discharge and does not affect the reaction gas composition.

5. The cotton stalk microwave pyrolysis reaction system according to claim 4, characterized in that: The microwave reaction chamber (1) is provided with a biomass charcoal discharge machine (8) on the pipeline connected between the inclined tail section and the biomass charcoal screw discharge machine (9), which is used to quantitatively discharge the biomass charcoal collected by the biomass charcoal screw discharge machine (9).

6. The cotton stalk microwave pyrolysis reaction system according to claim 5, characterized in that: The straight section of the microwave reaction chamber (1) is divided into three reaction zones, and the top of the microwave reaction chamber (1) is provided with three temperature measuring devices (34), the ends of which are respectively placed in the upper, middle and lower three reaction zones in the straight section of the microwave reaction chamber (1), so as to realize the monitoring of the temperature in the upper, middle and lower three reaction zones.

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