Multi-stage catalytic treatment device for organic solid waste and use method of multi-stage catalytic treatment device
By using a multi-stage catalytic treatment device to perform graded pyrolysis of organic solid waste and using catalysts to regulate the pyrolysis process, the problem of excessive tar production and insufficient gaseous products in traditional pyrolysis methods has been solved, thus realizing the efficient resource utilization of organic solid waste.
Patent Information
- Application Number
- CN202610052320.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-15
- Publication Date
- 2026-02-27
AI Technical Summary
Traditional pyrolysis methods have low utilization rates for organic solid waste, produce large amounts of tar, and have a low proportion of high-calorific-value gaseous products, resulting in high operating costs and poor economic efficiency.
A multi-stage catalytic treatment device is adopted, which involves staged treatment through preliminary pyrolysis, catalytic pyrolysis and condensation zone. The catalyst is used to regulate the pyrolysis process at different stages, thereby reducing tar production and increasing the yield of high-calorific-value gaseous products.
It improves the resource utilization level of organic solid waste, increases gas production, reduces tar, increases calorific value, lowers operating costs, and extends the service life of catalysts.
Smart Images
Figure CN121576592A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a catalytic treatment device for organic solid waste and its method of use. Background Technology
[0002] Solid waste management has become a global pollution control challenge due to its complexity. Currently, my country's annual production of organic solid waste from various sources—including domestic (kitchen waste, household waste), industrial (distillery waste, pharmaceutical residues, etc.), rural (crop straw, animal excrement), and municipal (sewage sludge)—reaches 6 billion tons. Failure to properly treat this organic solid waste will inevitably cause serious damage to the ecological environment. Organic solid waste is complex, containing resources such as carbon, nitrogen, and phosphorus, as well as harmful substances such as heavy metals and toxic organic compounds, thus possessing both resource and pollution attributes. There are various treatment methods for organic solid waste, among which pyrolysis technology is increasingly attracting attention due to its advantages such as good volume reduction, resource and energy utilization of byproducts, and minimal secondary environmental pollution.
[0003] However, traditional pyrolysis methods suffer from unstable product quality. Traditional pyrolysis generates large amounts of tar during the treatment of organic solid waste. This complex tar has high viscosity, leading to difficulties in cleanup and low utilization value. Furthermore, traditional pyrolysis produces a relatively small proportion of high-calorific-value gaseous products. While consuming a large amount of thermal energy, it cannot yield a sufficient quantity of usable energy gases, resulting in high operating costs and poor economic viability. Summary of the Invention
[0004] The present invention aims to solve the technical problem of low utilization rate of organic solid waste in existing pyrolysis methods, and provides a multi-stage catalytic treatment device for organic solid waste and its usage method.
[0005] The multi-stage catalytic treatment device for organic solid waste of the present invention consists of an outer shell 1, a rotating shaft motor 6, a controller 7, a first electric heating tube 8, a reaction turntable 9, a feed pipe 10, an air inlet pipe 11, a sludge scraper baffle 12, a waste collection tank 13, a mesh drawer 14, a condenser coil 15, a gas collection pipe 16, a second electric heating tube 17, and a support plate 18.
[0006] A horizontal support plate 18 is fixedly installed in the lower part of the inner cavity of the outer shell 1. Above the support plate 18 is the preliminary pyrolysis zone 2. A rotating shaft motor 6 is installed at the lower center of the support plate 18. The power output end of the rotating shaft motor 6 is fixed to the center of the lower surface of the reaction disc 9. The reaction disc 9 is positioned above the support plate 18, and the center of the reaction disc 9 coincides with that of the support plate 18. A gap is left between the reaction disc 9 and the inner wall of the outer shell 1. Four first heating tubes 8 are evenly arranged between the reaction disc 9 and the inner wall of the outer shell 1, and all four first heating tubes 8 are fixed to the support plate 18. The inner wall of the outer shell 1 is fixed... A sludge scraper 12 is located on the upper surface of the reaction turntable 9 and is slidably connected to it. The sludge scraper 12 does not pass through the center of the reaction turntable 9. A waste collection trough 13 is fixed on the inner wall of the outer shell 1. The waste collection trough 13 is located below the reaction turntable 9 and directly below the sludge scraper 12. A feed pipe 10 and an air inlet pipe 11 are also fixed on the inner wall of the outer shell 1. A first valve 10-1 is provided on the feed pipe 10, and the outlet of the feed pipe 10 is located above the reaction turntable 9. A second valve 11-1 is provided on the air inlet pipe 11, and the outlet of the air inlet pipe 11 is located below the reaction turntable 9.
[0007] Above the initial pyrolysis zone 2, there are two zones of equal height: a catalytic pyrolysis zone 3 and a condensation zone 4. The tops of the catalytic pyrolysis zone 3 and the condensation zone 4 are connected. Multiple grid drawers 14 are set in the catalytic pyrolysis zone 3. The grid drawers 14 are porous grids and are arranged vertically. A handle 14-1 is set on the outside of the grid drawer 14. The handle 14-1 is located outside the outer shell 1. The grid drawers 14 are set in the slide rails. A second electric heating tube 17 is set below each grid drawer 14.
[0008] A condenser coil 15 is installed in the condenser zone 4, and coolant 19 is installed outside the condenser coil 15. Below the condenser zone 4 is a tar collection zone 5, and above the tar collection zone is a gas collection pipe 16 that communicates with the bottom of the condenser zone 4. The top outlet of the gas collection pipe 16 is located outside the outer casing 1. A controller 7 is also installed in the outer casing 1. The signal output terminal of the controller 7 is connected to the signal input terminals of the first electric heating tube 8, the second electric heating tube 17, and the rotating shaft motor 6, respectively.
[0009] The method of using the multi-stage catalytic treatment device for organic solid waste of the present invention is as follows:
[0010] The catalyst required for pyrolysis is laid on each grid drawer 14. The organic solid waste to be pyrolyzed is fed uniformly onto the reaction turntable 9 through the feed pipe 10. Inert gas is introduced into the outer shell 1 through the air inlet pipe 11. In the preliminary pyrolysis zone 2, all the first electric heating tubes 8 are activated by the controller 7 to perform preliminary pyrolysis on the organic solid waste. The preliminary pyrolysis time of the organic solid waste is controlled by adjusting the rotation speed of the reaction turntable 9. The time required for the reaction turntable 9 to rotate once is the same as the preliminary pyrolysis time of the organic solid waste. During the preliminary pyrolysis process, the sludge scraper baffle 12 scrapes the organic solid waste that has been reacted on the reaction turntable 9 to the edge of the reaction turntable 9, and then falls into the waste collection tank 13 below through the gap between the reaction turntable 9 and the inner wall of the outer shell 1.
[0011] Subsequently, the gaseous tar and fuel gas produced by the initial pyrolysis are carried to the catalytic pyrolysis zone 3 by the inert gas blown in at a constant speed through the inlet pipe 11. They come into contact with the catalyst laid on the grid drawer 14 and undergo further catalytic pyrolysis under the temperature controlled by the second electric heating tube 17. After catalytic pyrolysis, the tar content of the products from the initial pyrolysis decreases while the fuel gas content increases. Then, the mixture of tar and fuel gas enters the condenser coil 15 of the condensation zone 4. The pyrolysis gas is condensed by the temperature difference with the coolant 19. The tar with a lower boiling point condenses down and is collected in the tar collection zone 5, while the remaining fuel gas is collected through the fuel gas collection pipe 16.
[0012] The above technical solutions can ensure that the staged pyrolysis of organic solid waste and that each stage of pyrolysis has sufficient conditions, thereby ensuring the normal operation of the multi-stage catalytic pyrolysis process.
[0013] In this invention, the scraper baffle 12 does not pass through the center of the reaction disc 9, that is, the scraper baffle 12 is inclined towards the inner wall of the outer shell 1 (e.g., Figure 3 As shown in the figure, it is convenient to scrape the organic solid waste that has finished reacting on the reaction disc 9 to the edge of the reaction disc 9 for collection.
[0014] The beneficial effects of this invention are as follows:
[0015] The multi-stage catalytic treatment device for organic solid waste proposed in this invention can convert tar into gaseous products while reducing pyrolysis costs by introducing catalysts and controlling the process at different stages of pyrolysis. This increases the yield of high-calorific-value gaseous products, reduces tar production, and adjusts the composition of gaseous products and tar to enhance their utilization performance.
[0016] This invention proposes a multi-stage catalytic pyrolysis treatment device and method for organic solid waste, enabling its resource recovery and utilization. Through multi-stage catalysis, tar is converted into small-molecule fuel gas, thereby changing the composition of gaseous products and tar, increasing fuel gas yield and calorific value, and reducing tar viscosity and yield. At the same time, it can maintain catalyst activity, extend catalyst life, reduce operating costs, and significantly improve the resource utilization level of organic solid waste.
[0017] Taking the pyrolysis treatment of distillers' grains as an example, compared with the traditional pyrolysis method, the multi-stage catalytic pyrolysis device and method proposed in this invention increases the gas volume yield by 136.9%, reduces the tar mass ratio by 45.9%, and increases the gas calorific value by 109.3%. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the multi-stage catalytic treatment device for organic solid waste in Specific Implementation Method 1;
[0019] Figure 2 for Figure 1 Sectional view along the AA direction;
[0020] Figure 3 for Figure 1 Sectional view in the BB direction. Detailed Implementation
[0021] Specific Implementation Method 1: This implementation method is a multi-stage catalytic treatment device for organic solid waste, such as... Figures 1-3 As shown, it is specifically composed of an outer shell 1, a rotating shaft motor 6, a controller 7, a first electric heating tube 8, a reaction turntable 9, a feed pipe 10, an air inlet pipe 11, a sludge scraper baffle 12, a waste collection tank 13, a mesh drawer 14, a condenser coil 15, a gas collection pipe 16, a second electric heating tube 17, and a support plate 18.
[0022] A horizontal support plate 18 is fixedly installed in the lower part of the inner cavity of the outer shell 1. Above the support plate 18 is the preliminary pyrolysis zone 2. A rotating shaft motor 6 is installed at the lower center of the support plate 18. The power output end of the rotating shaft motor 6 is fixed to the center of the lower surface of the reaction disc 9. The reaction disc 9 is positioned above the support plate 18, and the center of the reaction disc 9 coincides with that of the support plate 18. A gap is left between the reaction disc 9 and the inner wall of the outer shell 1. Four first heating tubes 8 are evenly arranged between the reaction disc 9 and the inner wall of the outer shell 1, and all four first heating tubes 8 are fixed to the support plate 18. The inner wall of the outer shell 1 is fixed... A sludge scraper 12 is located on the upper surface of the reaction turntable 9 and is slidably connected to it. The sludge scraper 12 does not pass through the center of the reaction turntable 9. A waste collection trough 13 is fixed on the inner wall of the outer shell 1. The waste collection trough 13 is located below the reaction turntable 9 and directly below the sludge scraper 12. A feed pipe 10 and an air inlet pipe 11 are also fixed on the inner wall of the outer shell 1. A first valve 10-1 is provided on the feed pipe 10, and the outlet of the feed pipe 10 is located above the reaction turntable 9. A second valve 11-1 is provided on the air inlet pipe 11, and the outlet of the air inlet pipe 11 is located below the reaction turntable 9.
[0023] Above the initial pyrolysis zone 2, there are two zones of equal height: a catalytic pyrolysis zone 3 and a condensation zone 4. The tops of the catalytic pyrolysis zone 3 and the condensation zone 4 are connected. Multiple grid drawers 14 are set in the catalytic pyrolysis zone 3. The grid drawers 14 are porous grids and are arranged vertically. A handle 14-1 is set on the outside of the grid drawer 14. The handle 14-1 is located outside the outer shell 1. The grid drawers 14 are set in the slide rails. A second electric heating tube 17 is set below each grid drawer 14.
[0024] A condenser coil 15 is installed in the condenser zone 4, and coolant 19 is installed outside the condenser coil 15. Below the condenser zone 4 is a tar collection zone 5, and above the tar collection zone is a gas collection pipe 16 that communicates with the bottom of the condenser zone 4. The top outlet of the gas collection pipe 16 is located outside the outer casing 1. A controller 7 is also installed in the outer casing 1. The signal output terminal of the controller 7 is connected to the signal input terminals of the first electric heating tube 8, the second electric heating tube 17, and the rotating shaft motor 6, respectively.
[0025] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the controller 7 is located below the support plate 18. Everything else is the same as in Specific Implementation Method One.
[0026] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the first valve 10-1 is a solenoid valve. Everything else is the same as in Specific Implementation Method One or Two.
[0027] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the second valve 11-1 is a solenoid valve. Everything else is the same as in Specific Implementation Methods One to Three.
[0028] Specific Implementation Method Five: This implementation method differs from Specific Implementation Method Four in that the signal output terminal of the controller 7 is connected to the signal input terminals of the second valve 11-1 and the first valve 10-1, respectively, to control the amount of inert gas and organic solid waste entering. Everything else is the same as in Specific Implementation Method Four.
[0029] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method Five in that the upper surface of the waste collection tank 13 is an inclined surface, gradually decreasing towards the inner wall of the outer shell 1. Everything else is the same as in Specific Implementation Method Five.
[0030] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method Six in that a hinged solid waste collection door is provided on the inner wall of the outer casing 1 next to the waste collection trough 13. Everything else is the same as in Specific Implementation Method Six.
[0031] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method Seven in that the first heating element 8 has a U-shaped structure. Everything else is the same as in Specific Implementation Method Seven.
[0032] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Method Eight in that the grid drawer 14 has three layers from top to bottom. Everything else is the same as in Specific Implementation Method Eight.
[0033] Specific Implementation Method Ten: This implementation method is the usage method of the multi-stage catalytic treatment device for organic solid waste in Specific Implementation Method One, as detailed below:
[0034] The catalyst required for pyrolysis is laid on each grid drawer 14. The organic solid waste to be pyrolyzed is fed uniformly onto the reaction turntable 9 through the feed pipe 10. Inert gas is introduced into the outer shell 1 through the air inlet pipe 11. In the preliminary pyrolysis zone 2, all the first electric heating tubes 8 are activated by the controller 7 to perform preliminary pyrolysis on the organic solid waste. The preliminary pyrolysis time of the organic solid waste is controlled by adjusting the rotation speed of the reaction turntable 9. The time required for the reaction turntable 9 to rotate once is the same as the preliminary pyrolysis time of the organic solid waste. During the preliminary pyrolysis process, the sludge scraper baffle 12 scrapes the organic solid waste that has been reacted on the reaction turntable 9 to the edge of the reaction turntable 9, and then falls into the waste collection tank 13 below through the gap between the reaction turntable 9 and the inner wall of the outer shell 1.
[0035] Subsequently, the gaseous tar and fuel gas produced by the initial pyrolysis are carried to the catalytic pyrolysis zone 3 by the inert gas blown in at a constant speed through the inlet pipe 11. They come into contact with the catalyst laid on the grid drawer 14 and undergo further catalytic pyrolysis under the temperature controlled by the second electric heating tube 17. After catalytic pyrolysis, the tar content of the products from the initial pyrolysis decreases while the fuel gas content increases. Then, the mixture of tar and fuel gas enters the condenser coil 15 of the condensation zone 4. The pyrolysis gas is condensed by the temperature difference with the coolant 19. The tar with a lower boiling point condenses down and is collected in the tar collection zone 5, while the remaining fuel gas is collected through the fuel gas collection pipe 16.
[0036] The invention was verified using the following experiments:
[0037] Experiment 1: This experiment is a multi-stage catalytic treatment device for organic solid waste, such as... Figures 1-3 As shown, it is specifically composed of an outer shell 1, a rotating shaft motor 6, a controller 7, a first electric heating tube 8, a reaction turntable 9, a feed pipe 10, an air inlet pipe 11, a sludge scraper baffle 12, a waste collection tank 13, a mesh drawer 14, a condenser coil 15, a gas collection pipe 16, a second electric heating tube 17, and a support plate 18.
[0038] A horizontal support plate 18 is fixedly installed in the lower part of the inner cavity of the outer shell 1. Above the support plate 18 is the preliminary pyrolysis zone 2. A rotating shaft motor 6 is installed at the lower center of the support plate 18. The power output end of the rotating shaft motor 6 is fixed to the center of the lower surface of the reaction disc 9. The reaction disc 9 is positioned above the support plate 18, and the center of the reaction disc 9 coincides with that of the support plate 18. A gap is left between the reaction disc 9 and the inner wall of the outer shell 1. Four first heating tubes 8 are evenly arranged between the reaction disc 9 and the inner wall of the outer shell 1, and all four first heating tubes 8 are fixed to the support plate 18. The inner wall of the outer shell 1 is fixed... A sludge scraper 12 is located on the upper surface of the reaction turntable 9 and is slidably connected to it. The sludge scraper 12 does not pass through the center of the reaction turntable 9. A waste collection trough 13 is fixed on the inner wall of the outer shell 1. The waste collection trough 13 is located below the reaction turntable 9 and directly below the sludge scraper 12. A feed pipe 10 and an air inlet pipe 11 are also fixed on the inner wall of the outer shell 1. A first valve 10-1 is provided on the feed pipe 10, and the outlet of the feed pipe 10 is located above the reaction turntable 9. A second valve 11-1 is provided on the air inlet pipe 11, and the outlet of the air inlet pipe 11 is located below the reaction turntable 9.
[0039] Above the initial pyrolysis zone 2, there are two zones of equal height: a catalytic pyrolysis zone 3 and a condensation zone 4. The tops of the catalytic pyrolysis zone 3 and the condensation zone 4 are connected. Three grid drawers 14 are set in the catalytic pyrolysis zone 3. The grid drawers 14 are porous grids and are arranged vertically. A handle 14-1 is set on the outside of the grid drawer 14. The handle 14-1 is located outside the outer shell 1. The grid drawers 14 are set in the slide rails. A second electric heating tube 17 is set below each grid drawer 14.
[0040] A condenser coil 15 is installed in the condenser zone 4, and coolant 19 is installed outside the condenser coil 15. Below the condenser zone 4 is a tar collection zone 5, and above the tar collection zone is a gas collection pipe 16 that communicates with the bottom of the condenser zone 4. The gas outlet at the top of the gas collection pipe 16 is located outside the outer casing 1. A controller 7 is also installed in the outer casing 1. The signal output terminal of the controller 7 is connected to the signal input terminals of the first electric heating tube 8, the second electric heating tube 17, and the rotating shaft motor 6, respectively.
[0041] The first valve 10-1 is a solenoid valve;
[0042] The second valve 11-1 is a solenoid valve; the controller 7 is located below the support plate 18, and the signal output terminal of the controller 7 is connected to the signal input terminals of the second valve 11-1 and the first valve 10-1 respectively, to control the amount of inert gas and organic solid waste entering.
[0043] The upper surface of the waste collection tank 13 is inclined and gradually decreases towards the inner wall of the outer shell 1. A hinged solid waste collection door is provided on the inner wall of the outer shell 1 next to the waste collection tank 13. Solid waste can be collected by opening this door.
[0044] The first heating element 8 has a U-shaped structure.
[0045] The specific method of using the aforementioned multi-stage catalytic treatment device for organic solid waste is as follows:
[0046] The catalyst required for pyrolysis (Ni-supported alumina, molar ratio of 1:4) is laid on each grid drawer 14. The organic solid waste (distillery waste) to be pyrolyzed is fed uniformly onto the reaction turntable 9 through the feed pipe 10, and nitrogen is introduced into the outer shell 1 through the air inlet pipe 11. In the preliminary pyrolysis zone 2, all the first electric heating tubes 8 (900℃) are activated by the controller 7 to perform preliminary pyrolysis of the organic solid waste. The preliminary pyrolysis time of the organic solid waste is controlled by adjusting the rotation speed (1r / h) of the reaction turntable 9. The time required for the reaction turntable 9 to rotate once is the same as the preliminary pyrolysis time of the organic solid waste. During the preliminary pyrolysis process, the sludge scraper baffle 12 scrapes the organic solid waste that has been reacted on the reaction turntable 9 to the edge of the reaction turntable 9, and then falls into the waste collection tank 13 below through the gap between the reaction turntable 9 and the inner wall of the outer shell 1.
[0047] Subsequently, the gaseous tar and fuel gas produced by the initial pyrolysis are carried to the catalytic pyrolysis zone 3 by the inert gas blown in at a constant speed through the inlet pipe 11. They come into contact with the catalyst laid on the grid drawer 14 and undergo further catalytic pyrolysis at a temperature controlled by the second electric heating tube 17 (900°C). After catalytic pyrolysis, the tar content of the products from the initial pyrolysis decreases while the fuel gas content increases. Then, the mixture of tar and fuel gas enters the condenser coil 15 of the condensation zone 4. The pyrolysis gas is condensed by the temperature difference with the coolant 19. The tar with a lower boiling point condenses down and is collected in the tar collection zone 5, while the remaining fuel gas is collected through the fuel gas collection pipe 16.
[0048] Taking the pyrolysis treatment of distillers' grains as an example, compared with the traditional pyrolysis method, the multi-stage catalytic pyrolysis device and method proposed in this invention increases the gas volume yield by 136.9%, reduces the tar mass ratio by 45.9%, and increases the gas calorific value by 109.3%.
Claims
1. A multi-stage catalytic treatment device for organic solid waste, characterized in that... The device consists of an outer shell (1), a rotating shaft motor (6), a controller (7), a first electric heating tube (8), a reaction turntable (9), a feed pipe (10), an air inlet pipe (11), a mud scraper (12), a waste collection tank (13), a mesh drawer (14), a condenser coil (15), a gas collection pipe (16), a second electric heating tube (17), and a support plate (18). A horizontal support plate (18) is fixedly installed in the lower part of the inner cavity of the outer shell (1). Above the support plate (18) is the preliminary pyrolysis zone (2). A rotating shaft motor (6) is installed at the lower center of the support plate (18). The power output end of the rotating shaft motor (6) is fixed at the center of the lower surface of the reaction disc (9). The reaction disc (9) is installed above the support plate (18), and the center of the reaction disc (9) coincides with that of the support plate (18). There is a gap between the reaction disc (9) and the inner wall of the outer shell (1). Four first electric heating tubes (8) are evenly arranged between the reaction disc (9) and the inner wall of the outer shell (1). All four first electric heating tubes (8) are fixed on the support plate (18). A scraper baffle (12) is located on the upper surface of the reaction turntable (9) and the two are slidably connected. The scraper baffle (12) does not pass through the center of the reaction turntable (9). A waste collection trough (13) is fixed on the inner wall of the outer shell (1). The waste collection trough (13) is located below the reaction turntable (9) and directly below the scraper baffle (12). A feed pipe (10) and an air inlet pipe (11) are also fixed on the inner wall of the outer shell (1). A first valve (10-1) is provided on the feed pipe (10), and the outlet of the feed pipe (10) is located above the reaction turntable (9). A second valve (11-1) is provided on the air inlet pipe (11), and the outlet of the air inlet pipe (11) is located below the reaction turntable (9). Above the initial pyrolysis zone (2) are two equal-height catalytic pyrolysis zones (3) and condensation zones (4), with the tops of the catalytic pyrolysis zone (3) and condensation zones (4) connected. Multiple grid drawers (14) are set in the catalytic pyrolysis zone (3). The grid drawers (14) are porous grids, and the multiple grid drawers (14) are arranged vertically. A handle (14-1) is set on the outside of the grid drawer (14). The handle (14-1) is located outside the outer shell (1). The grid drawer (14) is set in the slide. A second electric heating tube (17) is set below each grid drawer (14). A condenser coil (15) is provided in the condenser zone (4), and coolant (19) is provided outside the condenser coil (15). Below the condenser zone (4) is a tar collection zone (5), and above the tar collection zone is a gas collection pipe (16) that communicates with the bottom of the condenser zone (4). The top outlet of the gas collection pipe (16) is located outside the outer shell (1). A controller (7) is also provided in the outer shell (1). The signal output terminal of the controller (7) is connected to the signal input terminal of the first heating tube (8), the second heating tube (17), and the rotating shaft motor (6), respectively.
2. The multi-stage catalytic treatment device for organic solid waste according to claim 1, characterized in that... The controller (7) is located below the support plate (18).
3. The multi-stage catalytic treatment device for organic solid waste according to claim 1, characterized in that... The first valve (10-1) is a solenoid valve.
4. The multi-stage catalytic treatment device for organic solid waste according to claim 3, characterized in that... The second valve (11-1) is a solenoid valve.
5. The multi-stage catalytic treatment device for organic solid waste according to claim 4, characterized in that... The signal output terminal of the controller (7) is connected to the signal input terminals of the second valve (11-1) and the first valve (10-1), respectively.
6. The multi-stage catalytic treatment device for organic solid waste according to claim 1, characterized in that... The upper surface of the waste collection tank (13) is inclined and gradually decreases towards the inner wall of the outer shell (1).
7. The multi-stage catalytic treatment device for organic solid waste according to claim 6, characterized in that... A hinged solid waste collection door is provided on the inner wall of the outer casing (1) next to the waste collection tank (13).
8. The multi-stage catalytic treatment device for organic solid waste according to claim 1, characterized in that... The first heating element (8) has a U-shaped structure.
9. The multi-stage catalytic treatment device for organic solid waste according to claim 1, characterized in that... The grid drawer (14) has three layers from top to bottom.
10. The method of using the multi-stage catalytic treatment device for organic solid waste as described in claim 1, characterized in that... The usage method is as follows: The catalyst required for pyrolysis is laid on each grid drawer (14). The organic solid waste to be pyrolyzed is fed into the reaction turntable (9) at a uniform speed through the feed pipe (10). Inert gas is introduced into the outer shell (1) through the air inlet pipe (11). In the preliminary pyrolysis zone (2), all the first electric heating tubes (8) are started by the controller (7) to perform preliminary pyrolysis on the organic solid waste. The preliminary pyrolysis time of the organic solid waste is controlled by adjusting the rotation speed of the reaction turntable (9). The time required for the reaction turntable (9) to rotate once is the same as the preliminary pyrolysis time of the organic solid waste. During the preliminary pyrolysis process, the sludge scraper (12) scrapes the organic solid waste that has been reacted on the reaction turntable (9) to the edge of the reaction turntable (9), and then falls into the waste collection tank (13) below through the gap between the reaction turntable (9) and the inner wall of the outer shell (1). Subsequently, the gaseous tar and fuel gas produced by the initial pyrolysis are carried to the catalytic pyrolysis zone (3) by the inert gas blown in at a constant speed through the inlet pipe (11), and come into contact with the catalyst laid on the grid drawer (14). The catalytic pyrolysis is further catalytically pyrolyzed under the temperature controlled by the second electric heating tube (17). After the initial pyrolysis products are catalytically pyrolyzed, the tar content decreases while the fuel gas content increases. Then, the mixture of tar and fuel gas enters the condenser coil (15) of the condenser zone (4). The pyrolysis gas is condensed by the temperature difference with the coolant (19). The tar with a lower boiling point is condensed and collected by the tar collection zone (5), while the remaining fuel gas is collected through the fuel gas collection pipe (16).