High-temperature reactor with stirring device
By designing a structure with a stirring device in the high-temperature reactor, and using the elastic deformation ability of the stirring part to scrape off the inner wall adhesion layer, the problem of reduced heat transfer performance of the high-temperature reactor is solved, and the stability of the reaction temperature and product performance are achieved. promote.
Patent Information
- Application Number
- CN202411766182.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-01-21
AI Technical Summary
During operation, high-temperature reactors are prone to forming an inner wall adhesive layer, resulting in a decrease in heat transfer performance and the reaction temperature cannot meet the requirements, which affects product performance and output.
Design a high-temperature reactor with a stirring device, including a stirring shaft and a stirring assembly. The stirring assembly is composed of a connecting part and a stirring part. The stirring part has elastic deformation capability and is used to scrape adhering materials on the inner wall of the reactor.
Through the use of the stirring device, the adhesion layer on the inner wall of the reactor is effectively removed, the heat transfer performance is improved, and the stability of the reaction temperature is ensured, thereby improving product performance and output.
Smart Images
Figure CN119327394A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of high-temperature reactors, and in particular relates to a high-temperature reactor with a stirring device. Background Art
[0002] Mass transfer and heat transfer performance are key performances of high-temperature reactors and have a decisive influence on the smooth operation of high-temperature reactors. During the operation of high-temperature reactors, material adhesion may accumulate on the inner wall, and material adhesion has an adverse effect on the heat transfer on the inner wall. For example, in high-temperature reactors used for chemical vapor deposition reactions, it is difficult to avoid the formation of an adhesion layer on the inner wall of the reactor. If no intervention is made, the adhesion layer will become thicker and thicker, making the heat transfer of the inner wall of the reactor worse and worse. The reactor will not reach the required reaction temperature, thereby affecting the performance or output of the product, and even making the reaction unable to proceed, resulting in production interruption. Summary of the invention
[0003] In view of the above problems, the present invention provides a high-temperature reactor with a stirring device, comprising a reactor shell and a stirring device inside the shell, wherein a heating device is arranged on the outside of the reactor shell; the stirring device comprises a stirring shaft and at least one stirring component, wherein the stirring shaft is parallel to the axial direction of the reactor shell; the stirring component is perpendicular to the stirring shaft, and the tail end is fixedly connected to the stirring shaft, and the head end points to the inner wall of the reactor shell and extends to a position close to the inner wall of the reactor shell;
[0004] The stirring assembly includes a connecting part and a stirring part from the tail end to the head end. The connecting part is made of rigid material and cannot be deformed, and plays the role of connection and stirring; the stirring part has elastic deformation ability and is used to scrape off the adhered materials on the inner wall of the reactor shell.
[0005] Optionally, the reactor shell is vertical or horizontal, that is, the axial direction of the reactor shell is vertical or horizontal; the reactor shell is preferably cylindrical;
[0006] The heating device surrounds the outer side of the reactor shell and heats the high-temperature reactor.
[0007] Optionally, at least one of the top end or the bottom end of the stirring shaft passes through the reactor shell and is connected to an external driving motor.
[0008] Optionally, the stirring part is plate-shaped, with two side surfaces being parallel to the stirring axis, a thickness direction of the stirring part being between the two side surfaces, a length direction of the stirring part being between the two end surfaces, and the thickness direction being perpendicular to the length direction.
[0009] Further optionally, the ratio of the length of the stirring portion to the length of the connecting portion is 1:(2-10).
[0010] Optionally, the stirring part is a metal thin plate, preferably a stainless steel thin plate.
[0011] Further optionally, the thickness of the stirring part gradually decreases from the tail end to the head end, so that the thickness of the end of the stirring part facing the inner wall of the reactor shell is smaller and has elastic deformation ability, which is convenient for scraping off the substances adhered to the inner wall of the reactor shell;
[0012] The ratio of the thickness of the head end to the thickness of the tail end of the stirring part is 1:(1.5-3).
[0013] Further optionally, the thickness of the head end of the stirring part is 0.5-4.0 mm.
[0014] Optionally, the distance between the head end of the stirring part and the inner wall of the reactor shell is 1-50 mm, preferably 2-10 mm. The distance between the head end of the stirring part and the reactor shell can also be reasonably designed according to the reaction type in the reactor and the amount of the adhesion layer generated.
[0015] Optionally, the tail of the stirring part is detachably connected to the connecting part to facilitate replacement of the stirring part.
[0016] Optionally, a plurality of stirring assemblies are provided at the same height of the stirring shaft, and the plurality of stirring assemblies are evenly arranged along the circumference of the stirring shaft;
[0017] A plurality of stirring components are arranged along the length direction of the stirring shaft, and the plurality of stirring components are evenly arranged along the length of the stirring shaft.
[0018] Optionally, the stirring shaft includes an internal axis and an external sliding sleeve, the axis and the sliding sleeve are arranged concentrically, the sliding sleeve is arranged outside the axis, the axis is connected to an external drive motor, the outside of the sliding sleeve is connected to the stirring assembly, the top and / or bottom of the sliding sleeve is connected to a telescopic rod, the telescopic rod passes through the end (top or bottom) of the reactor shell and is connected to an external driving device;
[0019] The driving device pushes and pulls the sliding sleeve through the telescopic rod, so that the sliding sleeve moves along the axis, thereby driving the stirring assembly to move along the axis, and can clean different positions of the inner wall of the reactor shell.
[0020] A variety of chemical reactions can be carried out in the reactor shell of the present invention, such as high-temperature reduction reaction, carbon nanotube production, silane deposition on silicon carbon, chemical vapor deposition of nanomaterials and other high-value industrial reaction processes. The reaction temperature in the reactor shell is 350-1500°C. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic structural diagram of the high temperature reactor of Example 1;
[0022] Figure 2 for Figure 1 A three-dimensional schematic diagram of
[0023] Figure 3 Schematic diagram of the high temperature reactor of Example 8.
[0024] In the accompanying drawings, 1-reactor shell, 2-heating device, 3-stirring shaft, 4-stirring assembly, 5-connecting part, 6-stirring part, 7-axis, 8-sliding sleeve, 9-driving motor, 10-side, 11-end face, 12-inlet pipe, 13-product pipe, 14-feeding pipe, 15-exhaust pipe. DETAILED DESCRIPTION
[0025] Example 1
[0026] This embodiment provides a high temperature reactor with a stirring device, such as Figure 1-Figure 2 As shown, carbon nanotubes are generated by chemical vapor deposition reaction, including a reactor shell 1 and a stirring device inside the shell, and a heating device 2 is provided on the outside of the reactor shell 1; the stirring device includes a stirring shaft 3 and 16 stirring components 4, and the stirring shaft 3 is parallel to the axial direction of the reactor shell 1; the stirring components 4 are perpendicular to the stirring shaft 3, and the tail end is fixedly connected to the stirring shaft 3, and the head end points to the inner wall of the reactor shell 1 and extends to a position close to the inner wall of the reactor shell 1;
[0027] The stirring assembly 4 includes a connecting portion 5 and a stirring portion 6 from the tail end to the head end. The connecting portion 5 is made of a rigid material and cannot be deformed. The stirring portion 6 has elastic deformation capability and is used to scrape off adhered materials on the inner wall of the reactor shell 1.
[0028] The reactor shell 1 is vertical, that is, the axial direction of the reactor shell 1 is vertical; the reactor shell 1 is cylindrical, with an inner diameter of 1.8m and a height of 8m, and the height of the effective reaction zone is 5 meters; the heating device 2 is a heating electric furnace, which surrounds the outer side of the reactor shell 1 and heats the high-temperature reactor.
[0029] The top end of the stirring shaft 3 passes through the top of the reactor shell 1 and is connected to the driving motor above the reactor shell 1 .
[0030] The connection part can be in various forms, such as rods, bars, tubes, etc., and can be made of stainless steel or other metals.
[0031] The stirring part is in the shape of a vertical plate, with two side surfaces 10 parallel to the stirring shaft 3 , a thickness direction of the stirring part between the two side surfaces 10 , a length direction of the stirring part between the two end surfaces 11 , and the thickness direction being perpendicular to the length direction.
[0032] The ratio of the length of the stirring portion 6 to the length of the connecting portion is 1:10, that is, the length of the stirring portion is 69.2 mm, and the length of the connecting portion is 692.0 mm.
[0033] The tip of the stirring part 6 contacts the adhesion layer on the inner wall of the reactor shell and is squeezed and deformed by the adhesion layer. The stirring part can generate a rebound force to scrape away the obstacles.
[0034] The thickness of the stirring part 6 gradually decreases from the rear end to the front end of the stirring assembly 4, so that the end of the stirring part 6 facing the inner wall of the reactor shell 1 has a smaller thickness and has elastic deformation ability, which is convenient for scraping off the substances adhering to the inner wall of the shell. The ratio of the thickness of the front end to the thickness of the rear end of the stirring part is 1:1.5.
[0035] The stirring part 6 is a stainless steel thin plate 310S, the thickness of the head end is 2.0 mm, and the thickness of the tail end of the stirring part 6 is 3.0 mm.
[0036] The distance between the head end of the stirring part 6 and the inner wall of the reactor shell 1 is 2.0 mm, so that the tip of the stirring part 6 does not touch the inner wall. When the thickness of the adhesion layer on the inner wall increases to touch the tip of the stirring part 6, the stirring part 6 rotates with the stirring shaft 3 and plays the role of a scraper to scrape off the adhesion layer that can be touched, so that too much adhesion layer does not accumulate on the inner wall.
[0037] In the present invention, the connecting part is made of a rigid material, the stirring part is elastic, the strength of the connecting part is greater than that of the stirring part, and the stirring part can be partially deformed and can restore its original shape. The tip of the stirring part is also worn in the process of cleaning the adhesion layer. The stirring part is detachably connected to the connecting part, which is convenient for replacing and maintaining the stirring part to maintain the cleaning effect. The tip of the stirring part contacts the adhesion layer on the inner wall of the reactor shell 1, is squeezed and deformed by the adhesion layer, and the stirring part can generate a rebound force to scrape away obstacles.
[0038] On the other hand, in addition to the dimensional deviations generated during the manufacturing, transportation, and installation processes, the reactor shell 1 will also face the problem of thermal expansion and contraction of the equipment during the production process, and the equipment will also have a certain amount of deformation, and the stirring shaft 3 will also have tolerances during installation. In the face of the above-mentioned dimensional deviations, the stirring part can adaptively generate local elastic deformation to avoid scratching the inner wall of the reactor when contacting the inner wall of the reactor, or blocking the stirring device, etc.
[0039] The stirring part has a certain adaptive elastic deformation space, so that the tip of the stirring part is as close to the inner wall of the reactor shell 1 as possible, thereby avoiding reserving a large gap and avoiding thick sediment deposition on the inner wall. It can adapt to obstacles on the inner wall and can operate stably for a long time.
[0040] Two stirring assemblies 4 are provided at the same height of the stirring shaft 3 and are evenly arranged along the circumference of the stirring shaft 3;
[0041] Eight stirring assemblies 4 are arranged in the length direction of one side of the stirring shaft 3 , and the eight stirring assemblies 4 are evenly arranged along the length of the stirring shaft 3 .
[0042] The bottom of the reactor shell 1 is provided with an air inlet pipe 12 and a product pipe 13, wherein the air inlet pipe 12 is used to introduce protective gas or process gas, and the product pipe 13 is used to discharge carbon nanotube products. The top of the reactor shell 1 is provided with an exhaust pipe 15 and a feed pipe 14, wherein the exhaust pipe 15 is used to discharge exhaust gas, and the feed pipe 14 is used to add catalyst.
[0043] First, nitrogen was introduced into the reactor to replace the air in the reactor and obtain a nitrogen environment. Then, the reactor was heated to 700°C by a heating furnace, the stirring shaft 3 was started, 6.0 kg of catalyst (Fe-Ni-Mo catalyst loaded with Al2O3) was added through the feeding tube, and then propylene gas was introduced, the flow rate of propylene gas was 3987.5 L / min, the reaction time was 1 hour, and 273 kg of carbon nanotubes were discharged from the product pipe after the reaction was completed.
[0044] Example 2
[0045] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the length of the stirring portion to the length of the connecting portion is 1:2.
[0046] Example 3
[0047] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the length of the stirring portion to the length of the connecting portion is 1:1.9.
[0048] Example 4
[0049] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the length of the stirring portion to the length of the connecting portion is 1:10.1.
[0050] Example 5
[0051] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the thickness of the head end to the thickness of the tail end of the stirring part is 1:3.
[0052] Example 6
[0053] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the thickness of the head end to the thickness of the tail end of the stirring part is 1:1.4.
[0054] Example 7
[0055] This embodiment provides a high temperature reactor with a stirring device, which is the same as Embodiment 1, except that the ratio of the thickness of the head end to the thickness of the tail end of the stirring part is 1:3.1.
[0056] Table 1 Comparison of stirring and scraping effects of Examples 1-7
[0057] project Carbon nanotube production (kg) project Carbon nanotube production (kg) Example 1 273 Example 5 264 Example 2 262 Example 6 240 Example 3 246 Example 7 252 Example 4 241
[0058] As can be seen from the above table, the ratio of the length of the stirring part to the length of the connecting part, and the ratio of the thickness of the head end to the thickness of the tail end of the stirring part, have an impact on the stirring effect in the reactor and the effect of cleaning the inner wall adhesion layer. These two effects are comprehensively reflected in the carbon nanotube yield. The stirring part of Example 3 is too long. Since the stirring part itself has resilience, the too long stirring part will swing to a large extent during stirring, which reduces the stirring effect and the carbon nanotube yield. In severe cases, adjacent stirring parts may collide with each other under the action of rotational inertia. The stirring part of Example 4 is too short, which weakens the effect of the stirring part's elastic rebound, resulting in a decrease in the effect of cleaning the adhesion layer and a decrease in the carbon nanotube yield.
[0059] The thickness of the stirring part at both ends of Example 6 is similar, so that the two ends have similar resilience, but it still causes a relatively large swing, which reduces the stirring effect and the yield of carbon nanotubes. The thickness difference between the two ends of the stirring part of Example 7 is large, which makes the tail of the stirring part too thick, limiting the swing amplitude of its head end, affecting the effect of cleaning the adhesion layer, and the yield of carbon nanotubes will also decrease.
[0060] Example 8
[0061] This embodiment provides a high temperature reactor with a stirring device, which is the same as that of embodiment 1, except that Figure 3 As shown, the stirring shaft 3 includes an internal axis 7 and an external sliding sleeve 8, the axis 7 and the sliding sleeve 8 are concentrically arranged, the sliding sleeve 8 is sleeved on the outside of the axis 7, the top of the axis 7 is connected to the external drive motor 9, the outside of the sliding sleeve 8 is connected to the stirring assembly 4, the bottom end of the sliding sleeve 8 is connected to the telescopic rod, the telescopic rod passes through the bottom end of the reactor shell 1, and is connected to the external drive device 9;
[0062] A vertical groove is arranged on the outer side surface of the shaft center, and a protruding strip is arranged on the inner wall of the sliding sleeve. The protruding strip is clamped in the groove, so that the shaft center can drive the sliding sleeve to rotate.
[0063] The driving device 9 pushes and pulls the sliding sleeve 8 through the telescopic rod, so that the sliding sleeve 8 moves along the axis 7, thereby driving the stirring assembly 4 to move along the axis 7, and can clean different positions of the inner wall of the reactor shell 1.
Claims
1. A high temperature reactor with a stirring device, characterized in that: The invention comprises a reactor shell and a stirring device inside the shell, wherein a heating device is arranged on the outer side of the reactor shell; the stirring device comprises a stirring shaft and at least one stirring component, wherein the stirring shaft is parallel to the axial direction of the reactor shell; the stirring component is perpendicular to the stirring shaft, and the tail end is fixedly connected to the stirring shaft, and the head end points to the inner wall of the reactor shell and extends to a position close to the inner wall of the reactor shell; The stirring component includes a connecting part and a stirring part from the tail end to the head end, wherein the connecting part is made of a rigid material; the stirring part has elastic deformation capability and is used to scrape off adhered materials on the inner wall of the reactor shell.
2. The high temperature reactor with a stirring device according to claim 1, characterized in that: The stirring part is plate-shaped, with two side surfaces parallel to the stirring axis, the thickness direction of the stirring part is between the two side surfaces, the length direction of the stirring part is between the two end surfaces, and the thickness direction is perpendicular to the length direction.
3. The high temperature reactor with a stirring device according to claim 2, characterized in that: The ratio of the length of the stirring portion to the length of the connecting portion is 1:(2-10).
4. The high temperature reactor with a stirring device according to claim 1, characterized in that: The stirring part is a metal thin plate, preferably a stainless steel thin plate.
5. The high temperature reactor with a stirring device according to claim 2, characterized in that: The thickness of the stirring part gradually decreases from the tail end to the head end, so that the thickness of the end of the stirring part facing the inner wall of the reactor shell is smaller and has elastic deformation ability, which is convenient for scraping off the substances adhered to the inner wall of the reactor shell; The ratio of the thickness of the head end to the thickness of the tail end of the stirring part is 1:(1.5-3).
6. The high temperature reactor with a stirring device according to claim 5, characterized in that: The thickness of the head end of the stirring part is 0.5-4.0 mm.
7. The high temperature reactor with a stirring device according to claim 1, characterized in that: The distance between the head end of the stirring part and the inner wall of the reactor shell is 1-50 mm.
8. The high temperature reactor with a stirring device according to claim 1, characterized in that: The tail of the stirring part is detachably connected to the connecting part, so that the stirring part is easy to replace.
9. The high temperature reactor with a stirring device according to claim 1, characterized in that: The reactor shell is vertical or horizontal, and the axial direction of the reactor shell is vertical or horizontal; the reactor shell is preferably cylindrical; The heating device surrounds the outer side of the reactor shell and heats the high-temperature reactor; At least one of the top end or the bottom end of the stirring shaft passes through the reactor shell and is connected to an external driving motor.
10. The high temperature reactor with a stirring device according to claim 1, characterized in that: A plurality of stirring assemblies are arranged at the same height of the stirring shaft, and the plurality of stirring assemblies are evenly arranged along the circumference of the stirring shaft; A plurality of stirring components are arranged along the length direction of the stirring shaft, and the plurality of stirring components are evenly arranged along the length of the stirring shaft.