Rotary reaction furnace

Abstract

The utility model relates to the technical field of heating reaction equipment, and provides a rotary reaction furnace which comprises a rack, a high-temperature furnace, a rotary cylinder, an inner cylinder and a driving assembly, the two ends of the rotating cylinder are connected with a detachable air inlet sealing cylinder and a detachable air outlet sealing cylinder respectively, and dynamic sealing is achieved through a sealing structure. The inner cylinder is coaxially arranged in the rotating cylinder to form an independent cavity, a cooling gas channel is arranged in the rotating cylinder, and rapid cooling is achieved through forced circulation. Oxygen is emptied between the rotating cylinder and the inner cylinder through a vacuum pump, protective gas is introduced to form a positive pressure barrier, and the explosion risk is eradicated. According to the utility model, through the modular design, the inner cylinder and the sealing cylinder can be quickly disassembled, and the maintenance cost is reduced; multiple safety protection devices effectively improve the safety of the equipment; the cooling channel design obviously shortens the cooling time and improves the equipment turnover rate; the device is suitable for preparing powder materials such as carbon nanotubes, and has the advantages of being compact in structure, convenient to operate, high in safety and the like.

Description

Technical Field

[0001] This utility model relates to the field of heating reaction equipment technology, specifically to a rotary reactor. Background Technology

[0002] A rotary reactor is a widely used thermal equipment for calcining, roasting, or drying granular and powdered materials, especially in the preparation of powder materials such as catalysts and carbon nanotubes. Its core structure consists of a steel furnace body, a refractory lining, a rotating cylinder, and a transmission device. The material is dynamically heated by the rotation of the furnace body, and the rotational motion promotes uniform heating of the material and accelerates the reaction within the furnace.

[0003] Traditional single-drum rotary kilns are prone to material sticking to the furnace walls at high temperatures. Powdered materials soften and adhere to the furnace walls at high temperatures, forming clumps that hinder material flow. This sticking also leads to uneven heat transfer, affecting product quality. The sticking material requires manual cleaning after shutdown, increasing maintenance costs.

[0004] In addition, due to poor sealing or improper pressure control, the high-temperature chamber inside a traditional rotary reactor may allow external oxygen to seep in and come into contact with high-temperature materials or gases, potentially causing combustion or explosion, making safety difficult to guarantee.

[0005] Therefore, it is of great significance to design a rotary reactor that is easy to clean and highly safe. Utility Model Content

[0006] To address the problems existing in the background art, this utility model provides a rotary reactor, comprising:

[0007] A frame, a high-temperature furnace mounted on the frame, a rotating cylinder rotatably disposed inside the high-temperature furnace, an inner cylinder coaxially disposed inside the rotating cylinder, and a drive assembly for driving the rotating cylinder to rotate.

[0008] The rotating cylinder is detachably connected to an air inlet sealing cylinder and an air outlet sealing cylinder at both ends, and the air inlet sealing cylinder and the air outlet sealing cylinder are connected to the rotating cylinder through a sealing structure.

[0009] A pressure cap is provided at the right end of the air inlet sealing cylinder. A reaction gas inlet pipe and a protective gas inlet pipe are provided through the pressure cap. The reaction gas inlet pipe passes through the pressure cap, the inside of the air inlet sealing cylinder, the rotating cylinder and communicates with the inner cylinder in sequence.

[0010] The protective gas inlet pipe is connected to the protective gas inlet located inside the air inlet sealing cylinder, and the protective gas inlet is connected to the cavity between the rotating cylinder and the inner cylinder.

[0011] The gas outlet sealing cylinder is equipped with a reaction gas exhaust pipe, which passes through the gas outlet sealing cylinder and the rotating cylinder and communicates with the inner cylinder.

[0012] In a preferred embodiment, the rotating cylinder is provided with a cooling gas channel, with a cooling gas inlet at the inlet end and a cooling gas outlet at the outlet end.

[0013] In a preferred embodiment, the inner wall of the inner cylinder is provided with catalyst baffles, which are distributed circumferentially along the inner cylinder.

[0014] In a preferred embodiment, a back-leakage filter head is provided at the connection between the reaction gas exhaust pipe and the gas outlet sealing cylinder, and a filter membrane is installed inside the back-leakage filter head.

[0015] In a preferred embodiment, an insulating cap is provided at the connection between the vent sealing cylinder and the rotating cylinder to insulate the end of the rotating cylinder.

[0016] In a preferred embodiment, the drive assembly includes a motor, a drive sprocket, a driven sprocket, and a chain. The motor is fixed to the frame, the drive sprocket is mounted on the output shaft of the motor, the driven sprocket is mounted on the rotating shaft of the rotating cylinder, and the drive sprocket and the driven sprocket are connected by a chain.

[0017] In a preferred embodiment, an inner cylinder support device is also installed on the frame. The inner cylinder support device includes a bearing seat and a shaft bracket, which supports the shaft of the rotating cylinder.

[0018] In a preferred embodiment, the reaction gas exhaust pipe is equipped with a thermocouple for monitoring the reaction temperature and an exhaust valve for controlling the emission of the reaction gas.

[0019] In a preferred embodiment, the cavity between the rotating cylinder and the inner cylinder is connected to a vacuum pump via a pipeline.

[0020] The beneficial effects achieved by this utility model are as follows:

[0021] First, this invention achieves rapid disassembly and maintenance through a detachable inlet and outlet sealing cylinder design, combined with an independent inner cylinder structure. This modular design allows for partial replacement of vulnerable parts, including the inner cylinder, inlet sealing cylinder, and outlet sealing cylinder, significantly reducing maintenance costs. The inner cylinder is installed separately from the rotating cylinder and can be removed for cleaning independently. This design solves the problems of severe wall adhesion and difficult cleaning in traditional equipment.

[0022] Secondly, this utility model incorporates multiple safety protection and leak-proof devices. A vacuum pump is used to pre-emptively vent oxygen from the cavity between the rotating cylinder and the inner cylinder, and an inert gas is introduced through a protective gas inlet pipe to form a positive pressure barrier, eliminating the risk of explosion. A back-leak filter head with a built-in filter membrane is installed at the outlet of the reaction gas exhaust pipe to prevent leakage of high-valence products such as carbon nanotubes.

[0023] Third, the rotating drum of this utility model has a built-in independent cooling channel, which achieves rapid cooling through forced gas circulation, completing the cooling that would normally take several hours in 30 minutes, reducing thermal stress damage and increasing equipment turnover rate by 40%. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the vent sealing cylinder structure.

[0027] Numbering on the map:

[0028] 1. Reactant gas inlet pipe; 2. Inlet sealing cylinder; 2-1. Pressure cap; 2-2. Protective gas inlet pipe; 2-3. Protective gas inlet; 3. Cooling gas passage; 3-1. Cooling gas inlet; 3-2. Cooling gas outlet; 4. Inner cylinder; 4-1. Catalyst baffle; 5. High-temperature furnace; 6. Protective cover; 7. Reactant gas exhaust pipe; 8. Outlet sealing cylinder; 8-1. Back-leak filter head; 8-2. Insulation head; 9. Vacuum pump; 10. Rotating cylinder; 10-1. Chain; 10-2. Drive sprocket; 10-3. Driven sprocket; 11. Thermocouple; 12. Motor; 13. Frame; 14. Inner cylinder support device; 15. Exhaust valve. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] Reference Figures 1-3 A rotary reactor structure includes a frame 13, which serves as the basic support structure for the equipment and houses all core components. An inner cylinder support device 14, comprising a bearing housing and a shaft bracket, is fixed to the frame 13. It supports the shaft of the rotating cylinder 10, ensuring rotational stability. A high-temperature furnace 5, fixed to the frame 13, houses the rotating cylinder 10. It provides a high-temperature reaction environment, heating the rotating cylinder 10 to a specified temperature via an internal heating device. A protective cover 6 is installed on the outside of the high-temperature furnace 5 for protection.

[0031] The rotating cylinder 10 is rotatably mounted inside the high-temperature furnace 5 and is driven by a drive assembly. Its right end is connected to the inlet sealing cylinder 2, and its left end is connected to the outlet sealing cylinder 8. An inner cylinder 4 is coaxially mounted inside, forming a cavity between the two.

[0032] The drive assembly includes a motor 12, fixed to the frame 13, providing rotational power. A drive sprocket 10-2 is mounted on the output shaft of the motor 12. A driven sprocket 10-3 is mounted on the shaft of the rotating drum 10. A chain 10-1 connects the drive sprocket 10-2 and the driven sprocket 10-3, transmitting power. The motor 12 drives the drive sprocket 10-2 to rotate, which in turn drives the driven sprocket 10-3 and the rotating drum 10 to rotate synchronously via the chain 10-1.

[0033] The inlet sealing cylinder 2 is detachably connected to the right end of the rotating cylinder 10 and is sealed to the rotating cylinder 10 through a sealing structure. The pressure cap 2-1 is installed at the right end of the inlet sealing cylinder 2 to achieve a seal. The reaction gas inlet pipe 1 passes through the pressure cap 2-1, the interior of the inlet sealing cylinder 2, and the rotating cylinder 10, extending into the interior of the inner cylinder 4 to deliver the reaction gas. The protective gas inlet pipe 2-2 passes through the pressure cap 2-1 and communicates with the protective gas inlet port 2-3 inside the inlet sealing cylinder 2. The protective gas inlet port 2-3 introduces the protective gas into the cavity between the rotating cylinder 10 and the inner cylinder 4 to prevent air infiltration and potential explosion.

[0034] A gas outlet sealing cylinder 8 is detachably connected to the left end of the rotating cylinder 10 and is sealed to the rotating cylinder 10 through a sealing structure. A reaction gas exhaust pipe 7 passes through the gas outlet sealing cylinder 8 and the rotating cylinder 10, and communicates with the inner cylinder 4 to discharge the reaction gas. A thermocouple 11 is installed on the reaction gas exhaust pipe 7 to monitor the reaction temperature in real time. An exhaust valve 15 is installed on the reaction gas exhaust pipe 7 to control gas discharge. A back-leakage filter head 8-1 is located at the connection between the reaction gas exhaust pipe 7 and the gas outlet sealing cylinder 8, and has a built-in filter membrane to prevent reactant leakage. An insulation end cap 8-2 is installed at the connection between the gas outlet sealing cylinder 8 and the rotating cylinder 10 to insulate the end of the rotating cylinder 10.

[0035] Cooling gas channel 3 is located inside the rotating cylinder 10 and is an independent circulation channel. Cooling gas inlet 3-1 is located at the inlet end of the channel, inputting cooling gas. Cooling gas outlet 3-2 is located at the outlet end of the channel, discharging cooling gas to achieve cooling of the rotating cylinder 10. Inner cylinder 4 is coaxially fixed inside the rotating cylinder 10 and rotates synchronously with the rotating cylinder 10. Catalyst baffles 4-1 are distributed circumferentially along the inner wall of the inner cylinder 4, causing the catalyst to tumble and promoting uniform reaction.

[0036] Thermocouple 11, installed on the reaction gas exhaust pipe 7, triggers the shutdown of reaction gas input and high-temperature furnace 5 when the reaction temperature reaches the set value. Vacuum pump 9, connected via pipeline to the cavity between rotating cylinder 10 and inner cylinder 4, is used to vent the gas inside rotating cylinder 10. Inlet sealing cylinder 2 is sealed to the right end of rotating cylinder 10, and outlet sealing cylinder 8 is sealed to the left end of rotating cylinder 10.

[0037] The power transmission path of this utility model includes:

[0038] Motor 12 → Drive sprocket 10-2 → Chain 10-1 → Driven sprocket 10-3 → Rotating cylinder 10.

[0039] The gas flow path includes: reactant gas inlet pipe 1 → inner cylinder 4 → reactant gas exhaust pipe 7. Protective gas inlet pipe 2-2 → protective gas inlet 2-3 → cavity between rotating cylinder 10 and inner cylinder 4. Cooling gas inlet 3-1 → cooling gas channel 3 → cooling gas outlet 3-2.

[0040] The working process of the rotary reactor of this utility model is as follows:

[0041] Start the vacuum pump 9 to purge the gas in the cavity between the rotating cylinder 10 and the inner cylinder 4 through the pipeline, eliminate residual air, and prevent the reaction gas from coming into contact with air at high temperature and causing an explosion.

[0042] At the same time, an inert gas, such as nitrogen, is introduced into the cavity through the protective gas inlet pipe 2-2 to form a positive pressure protective barrier, providing double protection against the infiltration of external air.

[0043] The outlet sealing cylinder 8 and the inlet sealing cylinder 2 are quickly connected to both ends of the rotating cylinder 10, achieving dynamic sealing through sealing components to ensure airtightness during high-temperature rotation. The heat-insulating end cap 8-2 uses high-temperature resistant materials such as ceramic fiber at the outlet end to reduce heat loss and maintain the stability of the reaction temperature.

[0044] The high-temperature furnace 5 is heated to the set temperature, and the rotating cylinder 10 is heated by radiation.

[0045] The reaction gas enters the inner cylinder 4 directly through the reaction gas inlet pipe 1 and comes into contact with the catalyst.

[0046] Protective gas path: The protective gas passes through the inlet pipe → inlet → cavity, forming an isolation layer to prevent high-temperature materials from oxidizing or exploding.

[0047] The motor 12 drives the rotating cylinder 10 to rotate via the sprocket and chain 10-1, and the inner cylinder 4 rotates synchronously. The catalyst baffles 4-1 on the inner wall of the inner cylinder 4 are distributed in a spiral or wavy shape, so that the catalyst particles are in full contact with the reaction gas, thereby improving the uniformity of the reaction.

[0048] The gaseous products generated by the reaction are discharged through the exhaust pipe. The back-leakage filter head 8-1 has a built-in ceramic filter membrane to intercept nanoscale solid products, such as carbon nanotubes, and prevent them from being lost due to gas leakage.

[0049] Thermocouple 11 monitors the exhaust pipe temperature in real time. When the temperature reaches a preset threshold, such as the reaction end temperature, it automatically closes the exhaust valve 15 and stops the input of reaction gas, achieving precise temperature control and safe shutdown.

[0050] After the reaction is complete, the high-temperature furnace 5 stops heating. Cooling gas enters the cooling channel inside the rotating cylinder 10 through the inlet, flows spirally along the cylinder wall, and exits through the outlet, achieving rapid and uniform cooling. Traditional equipment relies on natural cooling, which takes several hours; this design can shorten this time to within 30 minutes. After the temperature drops to room temperature, the inlet sealing cylinder 2 and the outlet sealing cylinder 8 are disassembled, and the inner cylinder 4 is directly extracted for cleaning, avoiding the cumbersome operation of disassembling the entire traditional equipment. The inner cylinder 4 is designed to be separate from the rotating cylinder 10, allowing for individual replacement or cleaning, reducing maintenance costs.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary reaction furnace, characterized by comprising: The utility model relates to a high-temperature furnace, a rotating cylinder rotatably arranged in the high-temperature furnace, an inner cylinder coaxially arranged in the rotating cylinder and a driving assembly for driving the rotating cylinder to rotate. Two ends of the rotating cylinder are respectively detachably connected with an air inlet sealing cylinder and an air outlet sealing cylinder, and the air inlet sealing cylinder and the air outlet sealing cylinder are connected with the rotating cylinder through a sealing structure. A right end of the air inlet sealing cylinder is provided with a gland, and a reaction gas inlet pipe and a protective gas inlet pipe are arranged through the gland. The protective gas inlet pipe is communicated with a protective gas inlet opening arranged in an inner cavity of the air inlet sealing cylinder, and the protective gas inlet opening is communicated with a cavity between the rotating cylinder and the inner cylinder. An air outlet pipe of the reaction gas is arranged on the air outlet sealing cylinder, and the air outlet pipe passes through the air outlet sealing cylinder and the rotating cylinder and is communicated with the inner cylinder. An inlet end of a cooling gas passage arranged in the rotating cylinder is provided with a cooling gas inlet, and an outlet end of the cooling gas passage is provided with a cooling gas outlet.

2. The rotary reaction furnace according to claim 1, characterized by An inner wall of the inner cylinder is provided with a catalyst baffle, and the catalyst baffle is distributed along a circumference of the inner cylinder.

3. The rotary reaction furnace of claim 1, wherein A reverse leakage filter head is arranged at a connection position of the air outlet pipe and the air outlet sealing cylinder, and a filter membrane is arranged in the reverse leakage filter head.

4. The rotary reaction furnace of claim 1, wherein A heat preservation head for heat preservation of an end of the rotating cylinder is arranged at a connection position of the air outlet sealing cylinder and the rotating cylinder.

5. The rotary reaction furnace of claim 1, wherein The driving assembly comprises a motor, a driving sprocket, a driven sprocket and a chain, the motor is fixed on the rack, the driving sprocket is installed on an output shaft of the motor, the driven sprocket is installed on a rotating shaft of the rotating cylinder, and the driving sprocket and the driven sprocket are connected through the chain.

6. The rotary reaction furnace of claim 1, wherein An inner cylinder supporting device is further installed on the rack, and the inner cylinder supporting device comprises a bearing seat and a rotating shaft support for supporting the rotating shaft of the rotating cylinder.

7. The rotary reaction furnace of claim 1, wherein A thermocouple for monitoring a reaction temperature and an exhaust valve for controlling exhaust of the reaction gas are installed on the air outlet pipe of the reaction gas.

8. The rotary reaction furnace of claim 1, wherein A cavity between the rotating cylinder and the inner cylinder is connected with a vacuum pump through a pipeline.

9. The rotary reaction furnace of claim 1, wherein ​

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