Biomass carbonization equipment for soil remediation
By using a circulating hot air and density-varying sorting system, the problem of uneven heating in biomass carbonization equipment was solved, achieving uniformity and homogeneity in biomass carbonization, improving soil remediation effectiveness and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN QINGYU ENVIRONMENTAL ENERGY TECH CO LTD
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-12
AI Technical Summary
In existing biomass carbonization equipment, the biomass raw materials are heated unevenly, resulting in uneven carbonization and difficulty in quality control. Furthermore, traditional equipment suffers from problems of insufficient carbonization and over-burning.
The system employs a circulating hot air system and a density-change-based sorting system. The circulating hot air forms a fluidized bed state in the carbonization furnace, and the density change of the biomass is used for dynamic sorting, achieving continuous feeding, carbonization, and sorting, and ensuring the uniformity of biomass carbonization.
It achieves uniformity and homogeneity in biomass carbonization, avoids insufficient carbonization and over-burning, improves soil remediation effect, reduces energy consumption, and ensures the safe and stable operation of the system.
Smart Images
Figure CN122012128A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of biomass carbonization, and in particular to a biomass carbonization device for soil remediation. Background Technology
[0002] Biomass undergoes pyrolysis under anaerobic or limited oxygen conditions, transforming unstable organic carbon into highly aromatic, stable carbon structures known as biochar. Biochar typically has a porous structure that can adsorb harmful substances, improve the soil's physical environment, and provide a home for beneficial microorganisms, thereby systematically remediating the soil. Chinese invention patent application CN118546702A discloses a biomass carbonization comprehensive recycling and reuse treatment device and method. This biomass carbonization equipment includes a crusher / pulverizer, a feeder, a pyrolyzer, a blower, a cold water storage tank, a conveyor belt, a gas collector, and a dust filter. The crusher / pulverizer, feeder, pyrolyzer, blower, cold water storage tank, conveyor belt, gas collector, and dust filter are mounted on a mobile platform. A first air duct is connected to the bottom of the crusher / pulverizer, with a dust filter connected to one end and a blower connected to the other end. A discharge pipe is located at the lower end of the first air duct. This invention solves the problem that most existing biomass carbonization recycling and treatment devices are large-scale units, occupying a large area, and are inconvenient to move and use when local material sourcing is required. It can be widely applied, convenient for users, and promotes the widespread development of environmental protection.
[0003] However, when the aforementioned carbonization equipment is in operation, the biomass raw materials accumulate at the bottom of the pyrolyzer, surrounding the heating rods, resulting in uneven heating of the biomass raw materials, uneven carbonization of the biomass, and difficulty in controlling the quality. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention provides a biomass carbonization device for soil remediation that utilizes circulating hot air to ensure sufficient and uniform heating of biomass raw materials and uses density changes in biomass for sorting to improve the uniformity of biochar.
[0005] This invention discloses a biomass carbonization device for soil remediation, comprising a heating box and a heating unit. The heating box contains a heating chamber, and the heating unit is mounted on the heating box, with its heating end extending into the heating chamber. It also includes a carbonization furnace, a blower, an upper air duct, a mixing pipe, a powder unit, and a return pipe. The carbonization furnace is vertically mounted in the heating chamber of the heating box, and the heating end of the heating unit heats the carbonization furnace. The carbonization furnace contains a pyrolysis chamber. The blower's outlet is connected to the input end of the upper air duct, and the output end of the upper air duct extends into the bottom of the pyrolysis chamber of the carbonization furnace. The input end of the mixing pipe extends into the top of the pyrolysis chamber of the carbonization furnace, and its output end is connected to the input end of the powder unit. Used to separate hot air and biomass carbon, the inlet of the reflux pipe is connected to the gas outlet of the powder unit. The reflux pipe is located in the heating chamber of the heating box, and the outlet of the reflux pipe is connected to the air inlet of the blower. The reflux pipe is located in the heating chamber of the heating box and close to the heating end of the heating unit, so that the waste heat of the air in the heating chamber of the heating box heats the gas in the reflux pipe. Biomass raw materials crushed to a certain particle size are fed into the pyrolysis chamber of the carbonization furnace through the feeding mechanism. The heating end of the heating unit heats the carbonization furnace, so that the biomass raw materials are heated in the pyrolysis chamber of the carbonization furnace. Simultaneously, the blower operates, causing the gas to circulate at high speed in the upper air duct, carbonization furnace, mixing pipe, powder unit, reflux pipe, and blower. Hot air, supplied through the upper duct, is blown into the pyrolysis chamber of the carbonization furnace from the bottom, agitating the biomass feedstock to form a fluidized bed. This allows the biomass feedstock to be heated by both the hot air and the outer wall of the carbonization furnace, gradually pyrolyzing and carbonizing it. This ensures sufficient and rapid contact between the biomass feedstock and the hot air, improving heat transfer efficiency. As the pyrolysis and carbonization of the biomass feedstock progresses, the porosity increases and the density decreases. By controlling the airflow velocity and temperature, newly added, incompletely carbonized, and denser feedstock remains in the lower part to continue reacting, while the fully carbonized, less dense biomass carbon naturally rises with the hot air flow to the top of the pyrolysis chamber and is then fed into the powder unit through the mixing pipe. The separation function of the feed unit allows the biomass carbon obtained from pyrolysis and carbonization to be discharged from the heating box through the solid phase end of the powder unit. The waste gas generated by pyrolysis and the original gas are input into the return pipe through the gas phase end of the powder unit, thus forming an internal circulation of hot air and a circulating heating system that utilizes waste heat. Compared with existing technologies that use circulating hot air to ensure that the biomass raw materials are heated fully and evenly, and utilize the density change of biomass during carbonization, a dynamic, density-based "sorting system" is formed inside the carbonization furnace. This achieves "continuous feeding, continuous carbonization, continuous sorting, and continuous discharge," ensuring the uniformity of the produced biochar and avoiding the problem of insufficient carbonization and overburning coexisting in traditional equipment, thereby improving the soil remediation effect.
[0006] Preferably, the powder unit is a cyclone separator, the inlet end of which is connected to the output end of the mixing pipe, the solid phase output end of which is the biomass carbon outlet, and the gas phase output end of which is connected to the input end of the reflux pipe. The cyclone separator is modified to withstand high temperatures so that it can work stably in high-temperature environments. The solid phase biomass carbon output from the cyclone separator is cooled by a cooling system to obtain the biomass carbon product.
[0007] Preferably, it also includes an expansion exchanger, which is set in the middle of the return pipe; by setting an expansion exchanger, the airflow velocity is reduced, the heat exchange area and residence time are increased, and the circulation heating efficiency of the circulating gas when flowing through the heating chamber of the heating box is significantly improved. This is a targeted optimization based on fluid mechanics and heat transfer.
[0008] Preferably, it also includes an air distribution head, which is installed on the output end of the upper air duct and located at the bottom of the pyrolysis chamber of the carbonization furnace; by installing the air distribution head, the hot air output from the upper air duct is evenly distributed to the bottom of the pyrolysis chamber of the carbonization furnace through the air distribution head, thereby improving the fluidization effect on the biomass raw materials.
[0009] Preferably, it also includes a pressure relief pipe and a burner. The pressure relief pipe is connected to the return pipe, and the burner is installed at the end of the pressure relief pipe. The burner is electrically connected to the heating unit. The pressure relief pipe guides the combustible gas generated by pyrolysis transported in the return pipe out. The heating unit controls the burner to ignite, thereby causing the combustible gas to burn and generate heat to heat the carbonization furnace and the return pipe, effectively utilizing the pyrolysis waste gas.
[0010] Preferably, it also includes a pressure relief valve, which is installed on the pressure relief pipe. When the exhaust gas pressure in the pressure relief pipe reaches the threshold, the pressure relief valve opens, allowing the exhaust gas to be burned through the burner, thereby maintaining a certain gas pressure in the hot air circulation system, ensuring the fluidization effect of biomass raw materials while improving safety.
[0011] Preferably, the system also includes a partition plate and a flow guide hood. The partition plate is installed in the middle of the pyrolysis chamber of the carbonization furnace. The partition plate is arranged in a positive conical shape and has a through hole one in the middle. The flow guide hood is installed at the top of the pyrolysis chamber of the carbonization furnace. The flow guide hood is inverted conical and has a through hole two in the middle. The partition plate divides the pyrolysis chamber of the carbonization furnace into a lower and upper part. The through hole one of the partition plate forms an upward airflow channel, allowing the denser biomass particles to circulate up and down below the partition plate under the obstruction of the partition plate, increasing the chance of contact with the inner wall of the carbonization furnace and improving the pyrolysis carbonization efficiency. The less dense biomass raw material follows the airflow and is concentrated in the upper part of the pyrolysis chamber of the carbonization furnace through the upward channel. The flow guide hood guides the hot airflow, improving the circulation efficiency of hot air and biomass raw material in the upper part of the pyrolysis chamber of the carbonization furnace. The fully pyrolyzed biomass carbon is transported to the mixing pipe through the through hole two of the flow guide hood, increasing the pyrolysis time of the biomass raw material and making the carbonization more complete.
[0012] Preferably, it also includes a receiving hopper and a discharge pipe. The receiving hopper is installed in the upper part of the pyrolysis chamber of the carbonization furnace and is located below the guide shroud. The discharge pipe is installed at the bottom of the receiving hopper, and the output end of the discharge pipe extends out of the heating box. A valve is installed on the discharge pipe. The receiving hopper is used to receive larger particles of biomass carbon that cannot rise and be discharged with the hot air flow. When a certain amount of biomass carbon accumulates in the receiving hopper, the valve of the discharge pipe is opened to discharge the biomass carbon.
[0013] Preferably, the assembly also includes a lifting pipe, a feeding hopper, spiral blades, a drive motor, and a feeding pipe. The lifting pipe is installed in the heating chamber of the heating box. A feeding hopper is located at the lower end of the lifting pipe and is connected to the interior of the lifting pipe. The spiral blades are rotatably installed inside the lifting pipe. The drive motor is installed above the lifting pipe and is connected to the spiral blades via a transmission connection. The upper end of the feeding pipe is connected to the upper end of the lifting pipe, and the lower end of the feeding pipe extends into the lower part of the pyrolysis chamber of the carbonization furnace. Biomass raw materials are added to the feeding hopper and enter the lifting pipe. Inside the lower part, the drive motor drives the spiral blades to rotate, and the spiral blades lift the biomass raw material to the upper end of the lifting pipe. During the lifting process, the biomass raw material is heated by the residual heat in the heating chamber of the heating box. The biomass raw material lifted to the upper end of the lifting pipe is fed into the lower part of the pyrolysis chamber of the carbonization furnace through the feeding pipe to achieve continuous feeding. At the same time, the lifting pipe and the feeding pipe form an N-shaped structure, forming an effective material seal, which can prevent the hot air in the carbonization furnace from backflowing into the lifting pipe, ensuring the safe and stable operation of the feeding system.
[0014] Preferably, it also includes a steam pipe, the lower end of which is internally connected to the upper end of the lifting pipe, and the upper end of the steam pipe extends out of the heating box; the biomass raw material is heated during the lifting process in the lifting pipe, and the evaporated steam is discharged through the steam pipe to dry the biomass raw material and reduce the energy consumption of the carbonization stage.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the circulating hot air ensures that the biomass raw material is heated fully and evenly, and the density change of biomass during carbonization forms a dynamic, density-based "sorting system" inside the carbonization furnace, realizing "continuous feeding, continuous carbonization, continuous sorting, and continuous discharge", which ensures the uniformity of the produced biochar and avoids the problem of insufficient carbonization and overburning coexisting in traditional equipment, thereby improving the soil remediation effect. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the isometric structure of the present invention; Figure 4 It is a partial cross-sectional structural diagram of structures such as carbonization furnaces; Figure 5 This is a front section diagram of structures such as carbonization furnaces; Figure 6 It is a structural diagram of the fan, upper air duct, mixing pipe, powder unit, return pipe, expansion exchanger, air distribution head, pressure relief pipe, burner and pressure limiting valve, etc. Figure 7 It is a structural diagram of the lifting pipe, feeding hopper, spiral blades, drive motor, feeding pipe and steam pipe.
[0017] The following are labels in the attached diagram: 1. Heating box; 2. Heating unit; 3. Carbonization furnace; 4. Fan; 5. Upper air duct; 6. Mixing pipe; 7. Powder unit; 8. Return pipe; 9. Expansion exchanger; 10. Gas distributor; 11. Pressure relief pipe; 12. Burner; 13. Pressure limiting valve; 14. Middle partition; 15. Flow guide; 16. Receiving hopper; 17. Discharge pipe; 18. Lifting pipe; 19. Feed hopper; 20. Spiral blade; 21. Drive motor; 22. Feeding pipe; 23. Steam pipe. Detailed Implementation
[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
[0019] Example 1 like Figures 1 to 3 , Figure 6 and Figure 7As shown, a biomass carbonization device for soil remediation includes a heating box 1 and a heating unit 2. The heating box 1 has a heating chamber inside, and the heating unit 2 is mounted on the heating box 1, with its heating end extending into the heating chamber of the heating box 1. It also includes a carbonization furnace 3, a blower 4, an upper air duct 5, a mixing pipe 6, a powder unit 7, and a return pipe 8. The carbonization furnace 3 is vertically installed in the heating chamber of the heating box 1. The heating end of the heating unit 2 heats the carbonization furnace 3. The carbonization furnace 3 has a pyrolysis chamber inside. The outlet of the blower 4 is connected to the input end of the upper air duct 5, and the output end of the upper air duct 5 extends into the bottom of the pyrolysis chamber of the carbonization furnace 3. The mixing pipe 6... The input end extends into the top of the pyrolysis chamber of the carbonization furnace 3. The output end of the mixing pipe 6 is connected to the input end of the powder unit 7, which is used to separate hot air and biomass carbon. The input end of the return pipe 8 is connected to the gas outlet of the powder unit 7. The return pipe 8 is located in the heating chamber of the heating box 1. The output end of the return pipe 8 is connected to the air inlet of the blower 4. The powder unit 7 is a cyclone separator. The inlet end of the cyclone separator is connected to the output end of the mixing pipe 6. The solid phase output end of the cyclone separator is the biomass carbon outlet. The gas phase output end of the cyclone separator is connected to the input end of the return pipe 8. It also includes an expansion exchanger 9, which is installed in the middle of the return pipe 8.
[0020] The cyclone separator is modified to withstand high temperatures, enabling it to operate stably in high-temperature environments. The solid biomass carbon output from the cyclone separator is cooled by a cooling system to obtain biomass carbon products. The return pipe 8 is located in the heating chamber of the heating box 1 and close to the heating end of the heating unit 2, so that the waste heat of the air in the heating chamber of the heating box 1 heats the gas in the return pipe 8. By setting an expansion exchanger 9, the airflow velocity is reduced, the heat exchange area and residence time are increased, and the circulation heating efficiency of the circulating gas when flowing through the heating chamber of the heating box 1 is significantly improved. The biomass raw material crushed to a certain particle size is fed into the pyrolysis chamber of the carbonization furnace 3 by the feeding mechanism. The heating end of the heating unit 2 heats the carbonization furnace 3, so that the biomass... The raw materials are heated in the pyrolysis chamber of the carbonization furnace 3. Simultaneously, the blower 4 operates, causing the gas to circulate at high speed through the upper air duct 5, carbonization furnace 3, mixing pipe 6, cyclone separator, return pipe 8, and blower 4. This allows the hot air output from the upper air duct 5 to be blown into the pyrolysis chamber of the carbonization furnace 3 from the bottom, lifting the biomass raw materials into a fluidized bed state. This results in the biomass raw materials being heated by both the hot air and the outer wall of the carbonization furnace 3, gradually leading to pyrolysis and carbonization. This ensures sufficient and rapid contact between the biomass raw materials and the hot air, improving heat transfer efficiency. As the pyrolysis and carbonization of the biomass raw materials progresses... Okay, the biomass feedstock has increased porosity and decreased density. By controlling the wind speed and temperature of the hot air, the newly added, incompletely carbonized, and denser feedstock remains in the lower part to continue the reaction, while the fully carbonized, less dense biomass carbon naturally floats to the top of the pyrolysis chamber of the carbonization furnace 3 with the hot air flow and is fed into the cyclone separator through the mixing pipe 6. Through the separation action of the cyclone separator, the biomass carbon obtained from pyrolysis and carbonization is discharged from the heating box 1 through the solid phase end of the cyclone separator. The waste gas generated by pyrolysis and the original gas are separated by the cyclone separator. The gas phase end of the air separator is fed into the return pipe 8, thus forming an internal circulation of hot air and a circulating heating system that utilizes waste heat. Compared with existing technologies that use circulating hot air to ensure that biomass raw materials are heated fully and evenly, and utilize the density change of biomass during carbonization, a dynamic, density-based "sorting system" is formed inside the carbonization furnace 3, realizing "continuous feeding, continuous carbonization, continuous sorting, and continuous discharge". This ensures the uniformity of the produced biochar and avoids the problem of insufficient carbonization and overburning coexisting in traditional equipment, thereby improving the soil remediation effect.
[0021] It also includes a pressure relief pipe 11 and a burner 12. The pressure relief pipe 11 is connected to the return pipe 8, and the burner 12 is installed at the end of the pressure relief pipe 11. The burner 12 is electrically connected to the heating unit 2. It also includes a pressure limiting valve 13, which is installed on the pressure relief pipe 11.
[0022] The pressure relief pipe 11 guides the combustible gas generated by pyrolysis transported in the return pipe 8 out. When the exhaust gas pressure in the pressure relief pipe 11 reaches the threshold, the pressure limiting valve 13 opens, and the heating unit 2 controls the burner 12 to ignite, so that the exhaust gas is burned through the burner 12, thereby generating heat from the combustion of the combustible gas to heat the carbonization furnace 3 and the return pipe 8. This effectively utilizes the pyrolysis exhaust gas, thereby maintaining a certain gas pressure in the hot air circulation system, ensuring the fluidization effect of the biomass raw materials while improving safety.
[0023] Example 2, as Figure 4 and Figure 5 As shown, based on Embodiment 1, it also includes a gas distribution head 10, which is installed on the output end of the upper air duct 5 and located at the bottom of the pyrolysis chamber of the carbonization furnace 3; it also includes a middle partition plate 14 and a flow guide shroud 15, which are installed in the middle of the pyrolysis chamber of the carbonization furnace 3 and are arranged in a positive cone shape with a through hole 1 in the middle; the flow guide shroud 15 is installed on the top of the pyrolysis chamber of the carbonization furnace 3 and is inverted cone shape with a through hole 2 in the middle; it also includes a receiving hopper 16 and a discharge pipe 17, which are installed on the upper part of the pyrolysis chamber of the carbonization furnace 3 and are located below the flow guide shroud 15; the discharge pipe 17 is installed at the bottom of the receiving hopper 16 and its output end extends out of the heating box 1; a valve is installed on the discharge pipe 17.
[0024] By installing the air distribution head 10, the hot air output from the upper air duct 5 is evenly distributed to the bottom of the pyrolysis chamber of the carbonization furnace 3, improving the fluidization effect on the biomass feedstock. The middle partition 14 divides the pyrolysis chamber of the carbonization furnace 3 into a lower and upper part. The through holes of the middle partition 14 form an airflow upward channel, allowing the denser biomass particles to circulate up and down below the middle partition 14 under the obstruction of the middle partition 14, increasing the contact opportunity with the inner wall of the carbonization furnace 3 and improving the pyrolysis and carbonization efficiency. The less dense biomass feedstock follows the airflow through... The rising channel is concentrated at the upper part of the pyrolysis chamber of the carbonization furnace 3. The guide hood 15 guides the hot air flow, improving the circulation efficiency of hot air and biomass raw materials in the upper part of the pyrolysis chamber of the carbonization furnace 3. The fully pyrolyzed biomass carbon is transported through the through hole bidirectional mixing pipe 6 of the guide hood 15, increasing the pyrolysis time of the biomass raw materials and making the carbonization more complete. The receiving hopper 16 is used to receive larger particles of biomass carbon that cannot rise and be discharged with the hot air flow. When a certain amount of biomass carbon accumulates in the receiving hopper 16, the valve of the discharge pipe 17 is opened to discharge the biomass carbon.
[0025] Example 3, as Figure 1 , Figure 2 and Figure 7As shown, based on Embodiment 1, it also includes a lifting pipe 18, a feeding hopper 19, a spiral blade 20, a drive motor 21, and a feeding pipe 22. The lifting pipe 18 is installed in the heating chamber of the heating box 1. The feeding hopper 19 is provided at the lower end of the lifting pipe 18 and is connected to the interior of the lifting pipe 18. The spiral blade 20 is rotatably installed in the lifting pipe 18. The drive motor 21 is installed above the lifting pipe 18 and is connected to the spiral blade 20 in a transmission manner. The upper end of the feeding pipe 22 is connected to the upper end of the lifting pipe 18, and the lower end of the feeding pipe 22 extends into the lower part of the pyrolysis chamber of the carbonization furnace 3. It also includes a steam pipe 23. The lower end of the steam pipe 23 is connected to the interior of the upper end of the lifting pipe 18, and the upper end of the steam pipe 23 extends out of the outside of the heating box 1.
[0026] Biomass feedstock is added to the feed hopper 19 and enters the lower end of the lifting pipe 18. The drive motor 21 drives the spiral blades 20 to rotate, and the spiral blades 20 lift the biomass feedstock to the upper end of the lifting pipe 18. During the lifting process, the biomass feedstock is heated by the residual heat in the heating chamber of the heating box 1. The biomass feedstock is heated during the lifting process in the lifting pipe 18, and the evaporated water vapor is discharged through the water vapor pipe 23 to dry the biomass feedstock and reduce the energy consumption of the carbonization stage. The biomass feedstock lifted to the upper end of the lifting pipe 18 is fed into the lower part of the pyrolysis chamber of the carbonization furnace 3 through the feeding pipe 22 to achieve continuous feeding. At the same time, the lifting pipe 18 and the feeding pipe 22 form an N-shaped structure, forming an effective material seal, which can prevent the hot air in the carbonization furnace 3 from backflowing into the lifting pipe 18 and ensure the safe and stable operation of the feeding system.
[0027] like Figures 1 to 7As shown, this invention provides a biomass carbonization device for soil remediation. During operation, the drive unit 21 first feeds biomass raw materials, pulverized to a certain particle size, into the lower part of the pyrolysis chamber of the carbonization furnace 3 via the lifting pipe 18 and the feeding pipe 22. The heating unit 2 heats the carbonization furnace 3, causing the biomass raw materials to be heated within the pyrolysis chamber. Then, the blower 4 operates, causing gas to circulate at high speed through the upper air duct 5, the carbonization furnace 3, the mixing pipe 6, the powder unit 7, the return pipe 8, and the blower 4. This allows hot air output from the upper air duct 5 to be blown into the pyrolysis chamber of the carbonization furnace 3 from the bottom, lifting the biomass raw materials to form a fluidized bed. The biomass raw materials are then subjected to dual heating by the hot air and the outer wall of the carbonization furnace 3, gradually undergoing pyrolysis and carbonization. As the pyrolysis and carbonization of the biomass raw materials proceed, the biomass... As the porosity of the raw materials increases and the density decreases, the biomass carbon naturally rises to the top of the pyrolysis chamber of the carbonization furnace 3 with the hot air flow and is input into the powder unit 7 through the mixing pipe 6. Through the separation effect of the powder unit 7, the biomass carbon obtained by pyrolysis and carbonization is discharged from the heating box 1 through the solid phase end of the powder unit 7. The waste gas generated by pyrolysis and the original gas are input into the return pipe 8 through the gas phase end of the powder unit 7, thus forming an internal circulation of hot air and a circulating heating using waste heat. Finally, when the waste gas pressure in the pressure relief pipe 11 reaches the threshold, the pressure limiting valve 13 opens, and the pressure relief pipe 11 guides the combustible gas generated by pyrolysis transported in the return pipe 8 out. The heating unit 2 controls the burner 12 to ignite, so that the waste gas is burned through the burner 12, thereby generating heat from the combustion of combustible gas to heat the carbonization furnace 3 and the return pipe 8.
[0028] The main functions achieved by this invention are: 1. Using a vertically installed carbonization furnace 3, the biomass raw materials are "blown up" or fluidized in the furnace by circulating hot air introduced from the bottom, so that the materials can have full and rapid contact with the hot air and the heat transfer efficiency is high. 2. By utilizing the density change of biomass during carbonization, a dynamic, density-based "sorting system" is formed inside the carbonization furnace 3, realizing "continuous feeding, continuous carbonization, continuous sorting, and continuous discharge". This ensures the uniformity of the produced biochar and avoids the problem of insufficient carbonization and overburning coexisting in traditional equipment, thereby improving the soil remediation effect. 3. Utilize waste heat to heat the circulating hot air, thereby improving thermal efficiency; 4. During the feeding process, the biomass is indirectly heated by the residual heat in the heating box 1, and the moisture is discharged at the top, which realizes the pre-drying of the material. The dried material enters the carbonization furnace, which can significantly reduce the energy consumption of the carbonization stage. 5. The N-shaped lifting pipe 18 and feeding pipe 22 form an effective material seal, which can prevent hot air in the carbonization furnace 3 from backflowing into the feeding system, ensuring the safe and stable operation of the system.
[0029] The biomass carbonization equipment for soil remediation of this invention uses common mechanical methods for installation, connection, or setup, and can be implemented as long as it achieves its beneficial effects. The heating box 1, heating unit 2, carbonization furnace 3, fan 4, upper air duct 5, mixing pipe 6, powder unit 7, return pipe 8, expansion exchanger 9, gas distribution head 10, burner 12, pressure relief valve 13, material lifting pipe 18, feed hopper 19, spiral blade 20, drive motor 21, and steam pipe 23 of the biomass carbonization equipment for soil remediation of this invention are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.
[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A biomass carbonization device for soil remediation, comprising a heating box (1) and a heating unit (2), wherein a heating chamber is provided inside the heating box (1), and the heating unit (2) is mounted on the heating box (1), with the heating end of the heating unit (2) extending into the heating chamber of the heating box (1); characterized in that, It also includes a carbonization furnace (3), a blower (4), an upper air duct (5), a mixing pipe (6), a powder unit (7), and a return pipe (8). The carbonization furnace (3) is vertically installed in the heating chamber of the heating box (1). The heating end of the heating unit (2) heats the carbonization furnace (3). The carbonization furnace (3) is equipped with a pyrolysis chamber. The air outlet of the blower (4) is connected to the input end of the upper air duct (5). The output end of the upper air duct (5) extends into the bottom of the pyrolysis chamber of the carbonization furnace (3). The input end of the mixing pipe (6) extends into the top of the pyrolysis chamber of the carbonization furnace (3). The output end of the mixing pipe (6) is connected to the input end of the powder unit (7). The powder unit (7) is used to separate hot air and biomass carbon. The input end of the return pipe (8) is connected to the gas outlet of the powder unit (7). The return pipe (8) is located in the heating chamber of the heating box (1). The output end of the return pipe (8) is connected to the air inlet of the blower (4).
2. The biomass carbonization equipment for soil remediation as described in claim 1, characterized in that, The powder unit (7) is a cyclone separator. The inlet end of the cyclone separator is connected to the output end of the mixing pipe (6). The solid phase output end of the cyclone separator is the biomass carbon outlet. The gas phase output end of the cyclone separator is connected to the input end of the return pipe (8).
3. The biomass carbonization equipment for soil remediation as described in claim 1, characterized in that, It also includes an expansion exchanger (9), with the expansion exchanger (9) installed in the middle of the return pipe (8).
4. The biomass carbonization equipment for soil remediation as described in claim 1, characterized in that, It also includes a gas distribution head (10), which is installed on the output end of the upper air duct (5) and is located at the bottom of the pyrolysis chamber of the carbonization furnace (3).
5. The biomass carbonization equipment for soil remediation as described in claim 1, characterized in that, It also includes a pressure relief pipe (11) and a burner (12). The pressure relief pipe (11) is connected to the return pipe (8). The burner (12) is installed at the end of the pressure relief pipe (11). The burner (12) is electrically connected to the heating unit (2).
6. The biomass carbonization equipment for soil remediation as described in claim 5, characterized in that, It also includes a pressure relief valve (13), which is installed on the pressure relief pipe (11).
7. The biomass carbonization equipment for soil remediation as described in claim 1, characterized in that, It also includes a partition plate (14) and a flow guide (15). The partition plate (14) is installed in the middle of the pyrolysis chamber of the carbonization furnace (3). The partition plate (14) is arranged in a positive cone shape and a through hole is provided in the middle of the partition plate (14). The flow guide (15) is installed on the top of the pyrolysis chamber of the carbonization furnace (3). The flow guide (15) is inverted cone shape and a through hole is provided in the middle of the flow guide (15).
8. A biomass carbonization device for soil remediation as described in claim 7, characterized in that, It also includes a receiving hopper (16) and a discharge pipe (17). The receiving hopper (16) is installed on the upper part of the pyrolysis chamber of the carbonization furnace (3). The receiving hopper (16) is located below the guide hood (15). The discharge pipe (17) is installed at the bottom of the receiving hopper (16). The output end of the discharge pipe (17) extends out of the heating box (1) and a valve is installed on the discharge pipe (17).
9. A biomass carbonization device for soil remediation as described in claim 1, characterized in that, It also includes a lifting pipe (18), a feeding hopper (19), a spiral blade (20), a drive motor (21), and a feeding pipe (22). The lifting pipe (18) is installed in the heating chamber of the heating box (1). The lower end of the lifting pipe (18) is provided with a feeding hopper (19). The feeding hopper (19) is connected to the interior of the lifting pipe (18). The spiral blade (20) is rotatably installed in the lifting pipe (18). The drive motor (21) is installed above the lifting pipe (18). The drive motor (21) is connected to the spiral blade (20) in a transmission connection. The upper end of the feeding pipe (22) is connected to the upper end of the lifting pipe (18). The lower end of the feeding pipe (22) extends into the lower part of the pyrolysis chamber of the carbonization furnace (3).
10. A biomass carbonization device for soil remediation as described in claim 9, characterized in that, It also includes a steam pipe (23), the lower end of which is connected to the upper end of the lifting pipe (18), and the upper end of the steam pipe (23) extends out of the heating box (1).