High-temperature carbon tube furnace equipment with inert gas protection channel
By setting up an inert gas protection channel and introducing inert gas in the high-temperature carbon tube furnace equipment, the problem of carbon tubes being easily oxidized was solved, the service life was extended, production costs were reduced, and production continuity was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CENT SOUTH UNIV
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-12
AI Technical Summary
In existing high-temperature carbon tube furnace equipment, carbon tubes are easily oxidized, leading to reduced service life, increased production costs, and disruption to production continuity.
An inert gas protection channel is set between the first carbon black filling layer and the second carbon black filling layer, and inert gas is introduced to balance the pressure inside and outside the carbon tube, reduce the infiltration of external air, and prevent the carbon tube from oxidizing.
It extends the service life of carbon nanotubes, reduces replacement frequency and production costs, ensures production continuity, and reduces energy consumption.
Smart Images
Figure CN224230717U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of graphite purification equipment, specifically to a high-temperature carbon tube furnace with an inert gas protection channel. Background Technology
[0002] Graphite, due to its high temperature resistance, corrosion resistance, acid and alkali resistance, thermal shock resistance, plasticity, self-lubrication, electrical conductivity, thermal conductivity, and good chemical stability, is widely used in traditional industries such as petroleum, metallurgy, and chemical industry, as well as emerging industries such as national defense, biomedicine, nuclear energy, and new energy. Because natural graphite contains impurities, high-temperature purification treatment is usually required to remove these impurities in order to meet the high purity requirements of high-end graphite products.
[0003] High-temperature purification of graphite is typically achieved using high-temperature carbon tube furnaces. Existing high-temperature carbon tube furnaces are mostly horizontal push-boat type furnaces, with internal carbon tubes serving as heating components. A graphite boat containing the graphite to be purified is continuously pushed through a high-temperature zone, enabling continuous batch production. The horizontal push-boat type carbon tube furnace consists of a furnace body, an asbestos insulation layer, and carbon tubes. The carbon tubes are generally made of high-temperature carbon materials with a porous structure. Carbon black, a loose carbonaceous material, is filled between the carbon tubes and the asbestos insulation layer. During the graphite purification process, the carbon black cannot completely prevent air permeation; therefore, external air gradually permeates through the pores in the carbon black layer to the outer wall of the carbon tube, where it undergoes an oxidation reaction at high temperatures. Once the carbon tube is oxidized, its outer wall thins, reducing its service life and affecting the continuity of production and the safety of the high-temperature carbon tube furnace operation. Furthermore, the thinning of the carbon tube's outer wall increases energy consumption, leading to increased production costs.
[0004] In summary, there is a need to develop a high-temperature carbon tube furnace with an inert gas protection channel to solve the problem of easy oxidation of carbon tubes in the existing technology. Utility Model Content
[0005] The purpose of this utility model is to provide a high-temperature carbon tube furnace with an inert gas protection channel. The specific technical solution is as follows:
[0006] This utility model provides a high-temperature carbon tube furnace with an inert gas protection channel, which includes a furnace shell, an insulation layer, a first carbon black filling layer, a second carbon black filling layer, an inert gas protection channel, and carbon tubes; the insulation layer, the first carbon black filling layer, the inert gas protection channel, the second carbon black filling layer, and the carbon tubes are coaxially arranged in the furnace shell in order from the outside to the inside.
[0007] Optionally, the distance between the inert gas protection channel and the carbon tube is 0.5 to 0.7 times the sum of the thicknesses of the first carbon black filling layer and the second carbon black filling layer; the thickness of the first carbon black filling layer is less than the thickness of the second carbon black filling layer.
[0008] Optionally, the thickness of the first carbon black filler layer is 0.38 to 0.8 times the thickness of the second carbon black filler layer.
[0009] Optionally, the inner diameter of the inert gas protection channel is 214–269 mm, and the outer diameter is 222–276 mm.
[0010] Optionally, the insulation layer may include an asbestos insulation layer.
[0011] Optionally, the high-temperature carbon tube furnace equipment with an inert gas protection channel further includes a first seal disposed at the inlet end of the carbon tube and a second seal disposed at the outlet end of the carbon tube.
[0012] Optionally, the high-temperature carbon tube furnace equipment with an inert gas protection channel further includes a third seal at the inlet end of the inert gas protection channel and a fourth seal at the outlet end of the inert gas protection channel.
[0013] The application of the technical solution of this utility model has at least the following beneficial effects:
[0014] This invention provides a high-temperature carbon tube furnace with an inert gas protection channel, which solves the problem of easy oxidation of carbon tubes in existing technologies. Specifically, to address the oxidation problem, this invention establishes an inert gas protection channel between the first and second carbon black filling layers, and introduces inert gas into the channel to balance the pressure inside and outside the carbon tube. This reduces the risk of external air permeating through the pores in the first and second carbon black filling layers to the outer wall of the carbon tube, thereby reducing oxidation and corrosion of the outer wall and extending the service life of the carbon tube. This reduces the frequency of carbon tube replacement, thus lowering production costs and operational risks, and also ensures production continuity to a certain extent. Furthermore, reducing oxidation and corrosion of the outer wall of the carbon tube reduces the risk of thinning of the outer wall, thus mitigating the problem of increased energy consumption and consequently increased production costs caused by thinning of the outer wall.
[0015] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description
[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:
[0017] Figure 1 This is a schematic diagram of the structure of a high-temperature carbon tube furnace with an inert gas protection channel in one of the embodiments;
[0018] Figure 2 yes Figure 1 Cross-sectional view along the AA direction;
[0019] Among them, 1. Furnace shell, 2. Insulation layer, 3. First carbon black filling layer, 4. Second carbon black filling layer, 5. Inert gas protection channel, 6. Carbon tube, 7. First sealing element, 8. Second sealing element, 9. Third sealing element, 10. Fourth sealing element. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0021] Example:
[0022] See Figures 1-2 A high-temperature carbon tube furnace with an inert gas protection channel includes a furnace shell 1, an insulation layer 2, a first carbon black filling layer 3, a second carbon black filling layer 4, an inert gas protection channel 5, and a carbon tube 6. The insulation layer 2, the first carbon black filling layer 3, the inert gas protection channel 5, the second carbon black filling layer 4, and the carbon tube 6 are coaxially arranged inside the furnace shell 1 in an order from the outside to the inside. The carbon tube 6 is horizontally arranged at the center position inside the furnace shell 1, so that when the carbon tube 6 is heated, the insulation layer 2, the first carbon black filling layer 3, and the second carbon black filling layer 4 located on the outer periphery of the carbon tube 6 cooperate to form a compact and stable insulation system, which can effectively reduce the heat loss of the carbon tube 6 and thus improve the thermal energy utilization rate.
[0023] Considering that the carbon black used in the first carbon black filling layer 3 and the second carbon black filling layer 4 is a loose carbonaceous material, during the graphite purification process of the carbon tube 6, the carbon black cannot completely prevent air permeation. Therefore, external air will gradually permeate through the pores in the first carbon black filling layer 3 and the second carbon black filling layer 4 to the outer wall of the carbon tube 6, thus undergoing an oxidation reaction with the carbon tube 6 at high temperatures. Once the carbon tube 6 is oxidized, its outer wall will become thinner, resulting in a reduced service life, affecting the continuity of production and the safety of the high-temperature carbon tube furnace equipment. In addition, the thinning of the outer wall of the carbon tube 6 leads to increased energy consumption, which in turn increases production costs. To address the issue of easy oxidation of the carbon black tube 6, this embodiment incorporates an inert gas protection channel 5 between the first carbon black filling layer 3 and the second carbon black filling layer 4. Inert gas is introduced into the inert gas protection channel 5 to balance the internal and external pressures of the carbon black tube 6, reducing the risk of external air permeating through the pores in the first and second carbon black filling layers 3 and 4 to the outer wall of the carbon black tube 6. This reduces oxidation and corrosion of the outer wall of the carbon black tube 6, extending its service life. It also reduces the frequency of replacement, thereby lowering production costs and operational risks, and ensuring production continuity to some extent. Furthermore, reducing oxidation and corrosion of the outer wall of the carbon black tube 6 reduces the risk of thinning, thus mitigating the increased energy consumption and consequently increased production costs caused by thinning of the outer wall.
[0024] The distance between the inert gas protection channel 5 and the carbon tube 6 is 0.5 to 0.7 times (specifically 0.6 times) the sum of the thicknesses of the first carbon black filling layer 3 and the second carbon black filling layer 4; the thickness of the first carbon black filling layer 3 is less than the thickness of the second carbon black filling layer 4. This causes the inert gas protection channel 5 to deviate from the carbon tube 6 and be closer to the insulation layer 2, thus keeping the inert gas protection channel 5 relatively far away from the high-temperature core area where the carbon tube 6 is located. On the one hand, this can reduce the risk of deformation and increased oxidation rate of the structural material of the inert gas protection channel 5 (such as carbon black material, which is pressed by conventional processes when manufacturing the inert gas protection channel 5) under long-term high temperature, thereby ensuring the stability of the channel structure; on the other hand, the thickness of the second carbon black filling layer 4 being greater than the thickness of the first carbon black filling layer 3 helps to strengthen the effect of preventing air from penetrating through the second carbon black filling layer 4 to the outer wall of the carbon tube 6, thereby reducing the oxidation and corrosion of the outer wall of the carbon tube 6.
[0025] The thickness of the first carbon black filling layer 3 is 0.38 to 0.8 times (specifically 0.64 times) the thickness of the second carbon black filling layer 4, which is used to ensure that the inert gas protection channel 5 is relatively far away from the high-temperature core area where the carbon tube 6 is located. In addition, the first carbon black filling layer 3 and the second carbon black filling layer 4 serve to provide heat insulation for the carbon tube 6 on the one hand, and to hinder the permeation of external air to the outer wall of the carbon tube 6 on the other hand.
[0026] The inner diameter of the inert gas protection channel 5 is 214-269 mm (243 mm can be selected specifically), and the outer diameter is 222-276 mm (248 mm can be selected specifically), ensuring that the inert gas inside has a uniform flow space, thereby forming an effective blocking layer.
[0027] The insulation layer 2 is an asbestos insulation layer.
[0028] The high-temperature carbon tube furnace equipment with an inert gas protection channel includes a first sealing element 7 (specifically a sealing ring) installed at the inlet end of the carbon tube 6 and a second sealing element 8 (specifically a sealing ring) installed at the outlet end of the carbon tube 6 to prevent external air from flowing into the carbon tube 6.
[0029] The high-temperature carbon tube furnace equipment with an inert gas protection channel further includes a third sealing element 9 (specifically a sealing ring) installed at the inlet end of the inert gas protection channel 5 and a fourth sealing element 10 (specifically a sealing ring) installed at the outlet end of the inert gas protection channel 5 to prevent external air from flowing into the inert gas protection channel 5.
[0030] The application method of the high-temperature carbon tube furnace equipment with inert gas protection channel is as follows:
[0031] Step S1: Assemble the high-temperature carbon tube furnace equipment; wherein, the first carbon black filling layer 3 and the second carbon black filling layer 4 are both made of carbon black material by conventional pressing process;
[0032] Step S2: Inert gas (specifically nitrogen) is introduced into the carbon tube 6 and the inert gas protection channel 5 respectively. The mass flow rate of the inert gas in the inert gas protection channel 5 is 2 to 5 times (specifically 3 times) the mass flow rate of the inert gas in the carbon tube 6. This is used to balance the pressure inside and outside the carbon tube 6, reduce the risk of external air penetrating to the outer wall of the carbon tube 6 through the pores in the first carbon black filling layer 3 and the second carbon black filling layer 4, thereby reducing the oxidation and corrosion of the outer wall of the carbon tube 6 and extending the service life of the carbon tube 6. The mass flow rate of the inert gas introduced into the inert gas protection channel 5 is 0.432 kg / h, which reduces the risk of external air penetrating to the outer wall of the carbon tube 6.
[0033] The inert gas in the carbon tube 6 is introduced from its outlet end and flows out from its inlet end; the inert gas in the inert gas protection channel 5 flows in the same direction as the inert gas in the carbon tube 6, that is, the inert gas is introduced from the outlet end of the inert gas protection channel 5 and flows out from the inlet end of the inert gas protection channel 5.
[0034] Step S3: Heat the carbon tube 6 and continuously push the graphite boat containing the graphite to be purified from the inlet end of the carbon tube 6 to carry out mass production of graphite purification.
[0035] In step S2, the inert gas in the carbon tube 6 is introduced from its outlet end and flows out from its inlet end in order to form a convection with the graphite to be purified being pushed, that is, the introduced inert gas carries away the external air brought in when the graphite is fed, thereby reducing the oxidation of the graphite and the carbon tube 6 by the external air.
[0036] Considering that the carbon tube 6 is made of high-temperature carbon material with a porous structure, the external air brought in by the graphite feeding in the carbon tube 6 may diffuse into the second carbon black filling layer 4 and the inert gas protection channel 5 outside the carbon tube 6. Therefore, in step S2, the flow direction of the inert gas in the inert gas protection channel 5 is the same as the flow direction of the inert gas in the carbon tube 6. On the one hand, it is convenient to work with the inert gas introduced into the carbon tube 6 to remove the external air brought in by the graphite feeding, thereby reducing the oxidation of graphite and carbon tube 6 by external air. On the other hand, it is convenient to remove the air that seeps in from the outside, thereby reducing the oxidation of graphite and carbon tube 6 by external air.
[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A high-temperature carbon tube furnace with an inert gas protection channel, characterized in that, It includes a furnace shell (1), a heat insulation layer (2), a first carbon black filling layer (3), a second carbon black filling layer (4), an inert gas protection channel (5), and a carbon tube (6); the heat insulation layer (2), the first carbon black filling layer (3), the inert gas protection channel (5), the second carbon black filling layer (4), and the carbon tube (6) are coaxially arranged inside the furnace shell (1) in order from the outside to the inside.
2. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, The distance between the inert gas protection channel (5) and the carbon tube (6) is 0.5 to 0.7 times the sum of the thicknesses of the first carbon black filling layer (3) and the second carbon black filling layer (4); the thickness of the first carbon black filling layer (3) is less than the thickness of the second carbon black filling layer (4).
3. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, The thickness of the first carbon black filler layer (3) is 0.38 to 0.8 times the thickness of the second carbon black filler layer (4).
4. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, The inner diameter of the inert gas protection channel (5) is 214-269 mm, and the outer diameter is 222-276 mm.
5. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, The insulation layer (2) includes an asbestos insulation layer.
6. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, It also includes a first seal provided at the inlet end of the carbon tube (6) and a second seal provided at the outlet end of the carbon tube (6).
7. The high-temperature carbon tube furnace equipment with an inert gas protection channel according to claim 1, characterized in that, It also includes a third seal at the inlet end of the inert gas protection channel (5) and a fourth seal at the outlet end of the inert gas protection channel (5).