A graphene continuous production rotary furnace

Abstract

The present invention relates to the field of graphene preparation, and relates to a rotary furnace body for continuous preparation of graphene by thermal reduction. The rotary furnace body comprises an expansion furnace body, a carbonization furnace body and a dynamic and static sealing unit, the expansion furnace body comprises an expansion furnace tube and an expansion heating system, the carbonization furnace body comprises a carbonization furnace tube and a carbonization heating system, the expansion heating system and the carbonization heating system are respectively installed in an insulation box to realize zoned gradient heating, the expansion furnace tube and the carbonization furnace tube are provided with a support module at the bottom, and spiral guide plates are installed on the inner wall; the expansion furnace tube and the carbonization furnace tube have different rotation speeds, and are connected as a whole through a dynamic and static sealing unit, and the graphene oxide can be directly carbonized after expansion; the dynamic and static sealing unit and the inlet and outlet are provided with a water cooling structure and a sealing structure. The material is transported to the puffing furnace tube through the feeding system for puffing. Under the rotation of the puffing furnace tube and the push of the spiral guide plate, the puffed material is transferred from the dynamic and static sealing unit to the carbonization furnace tube for carbonization and then reduced to graphene, thereby realizing efficient and continuous production of graphene.

Description

Technical Field

[0001] The invention relates to the field of graphene preparation, in particular to a rotary furnace body for continuously preparing graphene by thermal reduction. Background Art

[0002] Graphene is a carbon atom 2 The two-dimensional planar material formed by hybridization is widely used in various fields because of its excellent mechanical properties, excellent electrical and thermal conductivity, and is called the "black gold of the 21st century". The main way to industrially produce graphene is to convert graphene oxide (GO) into graphene through thermal reduction. The thermal reduction method is widely used in industrial large-scale production due to its simple production method and low cost. The traditional graphene thermal reduction device includes an expansion rotary furnace and a carbonization rotary furnace. Since the minimum expansion time requirement of the material is 15 minutes and the minimum carbonization time requirement is 6 hours, in order to meet the reaction time of the material in the furnace tube, the reaction time of the material in the furnace tube is controlled by changing the furnace tube length and the furnace tube speed. Therefore, the expansion furnace tube and the carbonization furnace tube have different speeds and lengths, and the expansion furnace tube and the carbonization furnace tube cannot be directly connected. In addition, the sealing and coordination of the connection need to be considered at the connection, and the entire reaction process is carried out at high temperature, which brings great challenges to the sealing of the connection between the expansion furnace tube and the carbonization furnace tube. At present, graphene cannot be produced continuously in industrial production, so the expansion and carbonization processes are carried out separately, the production process is cumbersome, time-consuming and labor-intensive, and the production efficiency is low.

[0003] Graphene oxide contains tiny dust particles after expansion. Therefore, during the carbonization stage, workers need to wear dust-proof equipment to manually add materials, and the expanded materials need to be cooled before carbonization, which makes production time-consuming and labor-intensive, and causes energy waste. There are no reasonable cooling measures for the exposed parts of the equipment, so there are safety hazards in production. The raw materials produce a large amount of CO and CO during the reaction process. 2 Gas, carbon yield is reduced, and the environment is seriously polluted. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to address the shortcomings of the existing industrial technology of producing graphene by thermal reduction, and to propose a graphene continuous production rotary furnace, which can achieve efficient and continuous production of graphene.

[0005] A graphene continuous production rotary furnace body, the rotary furnace body comprising an expansion furnace body and a carbonization furnace body connected as one by a dynamic and static sealing unit, the dynamic and static sealing unit is provided with a water cooling structure. The expansion furnace body comprises an expansion furnace tube and an expansion heating system, the carbonization furnace body comprises a carbonization furnace tube and a carbonization heating system, the expansion heating system and the carbonization heating system are respectively arranged on the periphery of the expansion furnace tube and the carbonization furnace tube, and are installed in a heat preservation box;

[0006] The puffing furnace tube and the carbonization furnace tube are respectively provided with two identical support modules for support. The material first enters the puffing furnace body for puffing and then passes through the dynamic and static sealing units to the carbonization furnace body for carbonization, thereby generating graphene.

[0007] Furthermore, the support module adopts symmetrical rollers, and the expansion furnace tube, the carbonization furnace tube and the rollers are in direct contact, which plays a role of center limiting.

[0008] Furthermore, the puffing furnace tube includes flange 1, flange 2, sprocket, annular guide rail 1 and annular guide rail 2; the puffing furnace tube is a cylindrical pipe; flange 1 is welded on the left side of the outer surface of the puffing furnace tube, and annular guide rail 1 is welded on the right side of flange 1; flange 2 is welded on the right side of the puffing furnace tube, sprocket is welded on the left side of flange 2, and annular guide rail 2 is welded on the left side of the sprocket; a spiral guide plate 1 is provided on the inner wall of the puffing furnace tube.

[0009] Furthermore, the carbonization furnace tube includes flange three, flange four, flange five and annular guide rails three and four. Flange three is welded and located on the left side of the outer surface of the carbonization furnace tube. Flange four is welded on the outer surface of the carbide furnace tube and is located on the right side of flange three. Flange five is welded on the outer surface of the carbide furnace tube and is located on the right side of the carbide furnace tube.

[0010] Furthermore, the puffing furnace tube and the carbonization furnace tube are cylindrical tubes with an outer diameter of 300 mm. Most of the graphene oxide raw materials used on the market are prepared by the improved Hummers method, which uses strong acid to oxidize and peel graphite, so the graphene oxide contains a large amount of acidic substances, and the reaction is extremely violent during the puffing stage. Therefore, the furnace tube material is required to be high temperature resistant and corrosion resistant. The puffing furnace tube and the carbonization furnace tube material are selected from 310S stainless steel, which has the characteristics of high temperature resistance, acid and alkali corrosion resistance, and is not easy to wear and has high strength. It is an excellent material for manufacturing furnace tubes.

[0011] The annular guide rail three is welded to the carbonization furnace tube and is located on the right side of the flange plate four. The flange plate five is welded to the right side of the carbonization furnace tube. The guide rail four is welded to the furnace tube and is located on the left side of the flange plate five. A material guide plate is provided inside the carbonization furnace tube.

[0012] Furthermore, the guide plate is a spiral guide plate with a fixed lead, and is respectively welded to the inner walls of the puffing furnace tube and the carbonization furnace tube. The material is input from the feed port of the puffing furnace body for puffing. Under the rotation of the furnace tube, the guide plate continuously pushes the puffed material to the carbonization section for carbonization, and finally reaches the discharge port.

[0013] Furthermore, the guide plates are respectively welded to the inner walls of the expansion furnace tube and the carbonization furnace tube.

[0014] Further, the dynamic and static sealing unit comprises a dynamic ring flange 1 and a dynamic ring flange 2, a static ring and a sealing support, the dynamic ring flange 1 and the dynamic ring flange 2 are installed on the inner side of the static ring and are located on the same axis, the dynamic ring flange 1 is located on the left side of the dynamic and static sealing unit and is connected to the flange 5 by bolts, the dynamic ring flange 2 is located on the right side of the dynamic and static sealing unit and is connected to the flange 1 by bolts, the static ring and the sealing support are welded to form a cavity, a retaining ring is provided in the middle of the static ring to play an axial limiting role for the expansion furnace tube and the carbonization furnace tube, an annular groove 1 and an annular groove 2 are respectively provided on the left and right sides of the inner wall of the static ring for grease sealing, a water outlet is provided at the upper end of the static ring and a water inlet is provided at the lower end, the lower end of the sealing support is welded to the bottom plate, and the bottom plate is connected to the frame. The dynamic and static sealing unit and the expansion furnace tube and the carbonization furnace tube are located on the same axis. Cooling water is introduced from the water inlet at the lower end and flows out from the water outlet at the upper end, thereby ensuring that the cooling water fills the hollow cavity to achieve the purpose of cooling. The flow rate of the cooling water can be automatically adjusted according to the water temperature. The water temperature is detected by the temperature sensor, and the signal is transmitted to the PLC through the A / D conversion module. The PLC then outputs a signal to the flow control valve to control the flow rate of the cooling water.

[0015] Furthermore, the static ring and the sealing support are welded to form a cavity, and holes are opened at the upper and lower ends of the static ring. Cooling water is introduced from the water inlet at the lower end to cool the dynamic and static sealing units, and annular grooves are provided on the inner walls on both sides of the static ring to inject grease to achieve sealing. The sealing effect is optimized by cooling the sealing unit, and the surface temperature of the equipment is also made ≤50°C to ensure safe production.

[0016] Furthermore, the support module includes a roller, a rotating spindle, and a bearing support. The roller and the rotating spindle cooperate with a key, the rotating spindle cooperates with the bearing support, and the bearing support is connected to the frame using bolts.

[0017] Furthermore, a protective cover is installed outside the supporting module.

[0018] Preferably, the heating system comprises a carbon silicon rod, a ceramic ring, an insulating seat, and a heat preservation box, wherein the carbon silicon rod is installed in the ceramic ring for heating the furnace body, the ceramic ring is installed on the insulating seat, and the insulating seat is installed in the heat preservation box.

[0019] Furthermore, the heating system has a total of seven heating modules, wherein the puffing section is provided with one heating module, the carbonization section is provided with six heating modules, and each heating module is equipped with a temperature sensor. Starting from the puffing section, the first heating module is heated to 200°C, and then the temperature is successively increased by 200°C to the sixth module of the carbonization section, and the temperature of the sixth module is 1400°C.

[0020] Furthermore, the temperature sensor collects the temperature of each heating module and inputs the signal into the PLC through the A / D converter, so as to compare the actual temperature of each module with the set temperature. Based on the comparison result, the PLC outputs the signal to the temperature controller. The temperature controller controls the temperature by changing the current, thereby achieving precise temperature control of each heating module.

[0021] Furthermore, each heating module includes a carbon silicon rod, a ceramic ring, and an insulating seat, and is installed inside a semicircular furnace lining, and the furnace lining material is ceramic. The outside of the semi-cylindrical furnace lining and the insulation box form a cavity, and the inside of the cavity is filled with ceramic fiber. This material has the advantages of light weight, good temperature uniformity, fast heating speed, good thermal stability, and energy saving. The entire box is divided into an upper box and a lower box, which are connected in the middle by a hinge. The box cover is connected to the box frame by a hinge to form an openable structure that is easy to replace ceramic fibers.

[0022] Furthermore, each heating box is an independent unit, connected to the frame by a cotter pin through a movable hinge. The load-bearing structure of the insulation box is the four foot cups of the lower box, and each foot cup can be adjusted in height to ensure the stability of the heating system. The number of carbon silicon rods in the box is set according to the temperature requirements of different heating modules, and the carbon silicon rods are easy to replace, which is highly practical.

[0023] The advantages of the present invention are:

[0024] The present invention adopts a dynamic and static sealing unit to connect the expansion furnace body and the carbonization furnace body, and integrates the expansion and carbonization processes of graphene on the same equipment. The dynamic and static sealing unit includes a dynamic ring flange plate 1, a dynamic ring flange plate 2, a static ring and a sealing support. The dynamic ring flange plate 1 and the dynamic ring flange plate 2 are located inside the static ring and are independent components that do not contact. The dynamic ring flange plate 1 is connected to the flange plate 5 on the carbonization furnace tube, and the dynamic ring flange plate 2 is connected to the flange plate 1 on the expansion furnace tube. Even if the rotation speeds of the expansion furnace tube and the carbonization furnace tube are inconsistent, the connection can be achieved; the dynamic and static sealing unit and the expansion furnace tube and the carbonization furnace tube are located on the same axis to ensure the coordination of the connection. Annular grooves are arranged on both sides of the inner wall of the static ring for grease sealing, and the outer side is welded with the sealing support to form a cavity for passing cooling water. The upper and lower ends of the sealing support are provided with a water outlet and a water inlet. After passing cooling water, a cooling structure is formed to ensure safe production and achieve the best sealing effect. The volume of the material after expansion changes to nine times of the original volume. Under the action of the push between the materials and the gas flow, the expanded material passes through the dynamic and static sealing units to reach the carbonization furnace tube for carbonization to generate graphene, which greatly improves production efficiency, reduces energy loss and waste gas emissions, and realizes efficient and continuous production of graphene. It is an ideal equipment for industrial production of graphene. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is an overall cross-sectional view of the present invention.

[0027] Figure 3 Schematic diagram of the furnace support module.

[0028] Figure 4 It is a radial partial enlarged cross-sectional view of the support module.

[0029] Figure 5 It is a schematic diagram of the overall structure of the dynamic and static sealing unit.

[0030] Figure 6 It is a full cross-sectional view of the dynamic and static sealing unit.

[0031] Figure 7 This is a schematic diagram of the expansion furnace tube assembly structure.

[0032] Figure 8 This is a schematic diagram of the carbonization furnace tube assembly structure.

[0033] Fig. 9 It is a schematic diagram of the overall structure of the heating module.

[0034] Fig.10 This is a full cross-sectional view of the heating module.

[0035] Fig.11 It is the transmission principle diagram of the present invention.

[0036] The accompanying drawings are marked as follows:

[0037] 1——expansion furnace body; 11——expansion furnace tube; 111——flange plate 1; 112——flange plate 2; 113——sprocket; 114——annular guide rail 1; 115——annular guide rail 2; 11a——spiral guide plate 1; 12——expansion heating system; A1——feed cooling structure; B1——discharge cooling structure; 2——dynamic and static sealing unit; 21——dynamic ring flange 1; 22——dynamic ring flange 2; 23——static ring; 23a——annular groove 1, 23b——annular groove 2; 24——sealing support; 3——Carbonization furnace body; 31——Carbonization furnace tube; 311——Flange three; 312——Flange four; 313——Flange five; 314——Annular guide rail three; 315——Annular guide rail four; 31a——Spiral guide plate two; 32——Carbonization heating system; 24b——Water inlet; 24a——Water outlet;

[0038] 4——support module; 41——roller; 42——rotating spindle; 43——bearing support;

[0039] 5——frame; 51——bottom plate; 44——bolt;

[0040] 6——insulation box body; 61——upper box body; 611——front cover plate 1; 612——box support; 613——channel steel; 62——lower box body; 621——front cover plate 2;

[0041] 7——heating system; 71——carbon silicon rod; 72——insulating seat; 73——ceramic ring. DETAILED DESCRIPTION

[0042] See the following Figure 1 To Attachment Fig.11 , the present invention is described in detail.

[0043] Example: See attached Figure 1-6 A graphene continuous production rotary furnace body, comprising a feeding end A and a discharging end B, an expansion furnace body 1 and a carbonization furnace body 3 for expanding and carbonizing graphene oxide raw materials, a dynamic and static sealing unit 2 connecting the expansion furnace body 1 and the carbonization furnace body 3 as one body, the dynamic and static sealing unit 2 is provided with a water cooling structure, and a spiral guide plate 11a is provided on the inner wall of the expansion furnace tube 11 and a spiral guide plate 2 31a is provided on the inner wall of the carbonization furnace tube 31;

[0044] This technical solution will be used for the industrial production of graphene, integrating the puffing and carbonization processes of graphene on the same equipment. During the production process, the graphene oxide raw material is transported to the feeding end A of the rotary furnace body by the spiral feeding system. The graphene oxide reacts violently under the high temperature environment of the puffing section, and the raw material loses some functional groups and expands. Under the rotation of the puffing furnace tube 11 and the promotion of the spiral guide plate 11a, the puffed graphene oxide is transferred from the dynamic and static sealing unit 2 to the carbonization furnace body 3. Under the rotation of the carbonization furnace tube 31 and the promotion of the spiral guide plate 2 31a, the raw material sequentially enters different heating modules of the carbonization section to react. Finally, the functional groups of the graphene oxide are eliminated, the planar structure is repaired and graphene is generated. After reaching the discharge end B, the graphene enters the storage system for collection, and the storage system can be connected to the storage system by the discharge end flange 311.

[0045] Furthermore, the spiral feeding system can be connected to the rotary furnace body by bolt assembly or welding through the feed end flange 112. The applicant sets the temperature of the external heating system of the puffing furnace tube to 200°C by controlling the PLC system. The graphene oxide undergoes a puffing reaction in the puffing section, and the speed of the reduction drive motor is set to 0.2r / min-0.1r / min to rotate the puffing furnace tube. The reduction motor is connected through a coupling and a sprocket, and the chain transmits power to the sprocket 113 welded on the puffing furnace tube to drive the puffing furnace tube 11 to rotate. The graphene oxide reacts violently in the puffing section, ensuring that the reaction time is not less than five minutes, thereby meeting the puffing requirements of the raw materials.

[0046] Furthermore, the external heating system is installed in the insulation box 6, and the box is composed of an upper box 61 and a lower box 62. The current heating methods of industrial equipment are: resistance heating, electromagnetic induction heating, arc heating, microwave heating, infrared heating, etc. Resistance heating is heating by using the resistance thermal effect generated when current passes through a conductor. Due to its low cost and simple operation, it is widely used; the present invention adopts a resistance heating method, and the heating component is a carbon silicon rod 71, which is installed in the furnace lining groove. The two ends of the carbon silicon rod 71 are connected with round copper sheets and clamped by a spring installed on an insulating seat 72; the carbon silicon rod 71 is installed in a ceramic ring for furnace body heating, and the ceramic ring 73 is installed on an insulating seat 72. The insulating seat 72 is installed in the insulation box 6 with bolts. The heating system has high thermal efficiency, long service life, simple wiring, and convenient installation and maintenance.

[0047] Further, see Appendix Figure 9-10 The insulation box is divided into an upper box 61 and a lower box 62. The upper box includes a front cover plate 611, which is connected to the box bracket through a hinge 1. An "L"-shaped channel steel 613 is installed below the front cover plate 1, and a handle is installed above the channel steel. The lower box 62 includes a handle 2, which is installed on the front cover plate 2 621, and the front cover plate 2 621 is installed on the frame through a hinge 2. The front cover plate 1 611 and the front cover plate 2 621 can be opened and closed, which is convenient for adding a ceramic fiber insulation layer in the cavity between the heating furnace lining and the box cover, so as to achieve the effect of internal insulation and external heat insulation of the box. The "L"-shaped channel steel 613 overlaps the frame when the upper box is closed, and is used to limit the closing of the upper box and improve the force distribution. The temperature control system uses high-quality WR1P platinum-rhodium thermocouples, which are used to sense the temperature of the furnace heating temperature zone. The thermocouple has good linearity and high stability. When the upper and lower boxes are closed, a ring heating system is formed to heat the furnace tube at 360 degrees, reducing energy consumption and increasing the heated area of ​​the furnace tube.

[0048] Further, see Appendix Figure 1-7 , attached Fig.11 A flange 111 is welded on the left side of the expansion furnace tube 11, and a flange 2 112 is welded on the right side. The flange 2 is used to be bolted to the feed cooling structure flange, and the flange 111 is used to be bolted to the right side dynamic ring flange 22 of the dynamic and static sealing unit 2; an annular guide rail 114 and an annular guide rail 2 115 are welded on the left and right sides of the furnace tube, respectively. The annular guide rails are in contact with the roller 41 of the support module 4 and are used to bear the weight of the expansion furnace tube; a sprocket 113 is welded on the expansion furnace tube and is located on the left side of the flange 2 112. The reduction motor transmits power to the sprocket 113 through a chain drive, and then the sprocket 113 transmits the power to the gear reduction box through a chain drive for speed reduction.

[0049] Furthermore, the support module 4 is used to bear the weight of the expansion furnace tube. The support module is provided at the left and right ends of the expansion furnace body 1, respectively, which can reduce the deformation of the long-span support and improve the force distribution. Each support module adopts a symmetrical design, and the annular guide rail welded on the expansion furnace tube is in direct contact with the roller 41 of the support module. The stop ear on the annular guide rail serves as an axial limit for the furnace tube. The roller 41 cooperates with the rotating mandrel 42 through a key, and the rotating mandrel cooperates with the bearing support 43. The bearing support is connected to the bracket with a bolt 44, and lubricating oil can be injected through the oil nozzle to reduce friction during rotation. The components can be disassembled and easily replaced. A protective cover is installed on the outside of each support module to avoid contact with personnel and ensure safe production.

[0050] After consulting relevant technical literature, the applicant did not find a device for directly carbonizing graphene oxide after expansion. At present, the equipment for industrial thermal reduction production of graphene includes an expansion furnace and a carbonization furnace. Graphene oxide will produce dust particles after expansion. After the expanded material is cooled to room temperature, workers wearing protective masks add the expanded material to the crucible for carbonization, which is not only time-consuming and labor-intensive, but also has low production efficiency. In addition, the carbonization process requires reheating, which causes energy waste. The present invention uses a dynamic and static sealing unit 2 to connect the expansion furnace body 1 and the carbonization furnace body 3 to achieve continuous production of graphene.

[0051] See attached Figure 5 The dynamic and static sealing unit 2 includes a dynamic ring flange 21 and a dynamic ring flange 22, a static ring 23 and a sealing support 24. The dynamic ring flange 22 is connected to the flange 111 by bolts, and the dynamic ring flange 21 is connected to the flange 5 313 ​​by bolts. The static ring 23 and the sealing support 24 are triangularly welded to form a cavity. The sealing support 24 is welded to the bottom plate 51, and the bottom plate 51 is connected to the frame 5 by bolts. A retaining ring is arranged in the middle of the static ring to limit the expansion furnace tube 11 and the carbonization furnace tube 31 in the axial direction, and an annular groove 23a and an annular groove 23b are arranged on the left and right sides of the inner wall of the static ring respectively for injecting grease to fill the concave groove for sealing when they are matched with the dynamic ring flange 21 and the dynamic ring flange 22 respectively. A water outlet 24a and a water inlet 24b are respectively provided at the upper and lower ends of the sealing seat. Cooling water is passed from the water cooling source through a pipe into the cavity from the lower water inlet 24b, and the cooling water flows out from the upper water outlet 24a to ensure that the cooling water fills the cavity, and the flow rate of the cooling water can be automatically adjusted according to the water temperature. The water temperature is detected by a temperature sensor, and the signal is transmitted to the PLC through an A / D conversion module. After comparing the actual water temperature with the set water temperature, the PLC outputs a signal to the flow regulating valve, thereby controlling the flow rate of the cooling water to achieve the purpose of cooling and ensure the reliability and safety of the sealing effect.

[0052] In this technical solution, the expansion section and the carbonization section are connected by a dynamic and static sealing unit 2. After expansion, the graphene oxide enters the carbonization furnace body 3 for carbonization. Since the expanded graphene oxide needs to be guaranteed to react in the carbonization section for at least six hours, the rotation speed of the carbonization furnace tube is only half of the expansion furnace tube rotation speed: 0.1-0.05r / min, and the length of the carbonization furnace tube is longer than that of the expansion furnace tube.

[0053] Furthermore, the surface of graphene oxide contains abundant oxygen-containing functional groups such as carboxyl, hydroxyl, carbonyl, epoxy, etc., and different functional groups require different temperatures for elimination, so six heating modules are set in the carbonization section, and the heating modules include a heating system 7 and a heat preservation box 6, and each module contains an independent heating system 7; the first heating system entering the carbonization section from the puffing section sets the temperature to 400°C by controlling the PLC visual touch screen, and each subsequent heating module is heated at a gradient of 200°C. The temperature of the sixth heating module of the carbonization furnace is set to 1400°C, and precise temperature control is achieved through a modular heating system.

[0054] Furthermore, the heating module structure is similar to the puffing furnace heating module, the difference is that the carbon silicon rod length of the heating component of the puffing section is 500mm, and the module heating power is 900w; the length of the carbon silicon rod of the heating component of the carbonization section is 800mm, and the module heating power used is 1800w. The number of carbon silicon rods in each heating module increases with the set temperature.

[0055] Further, see Appendix Figure 8 ; Flange three 311, flange four 312, and flange five 313 are welded on the carbonization furnace tube; flange five is connected to the dynamic ring flange one 21 of the dynamic and static sealing unit by bolts, and flange four is connected to the flange on the discharge cooling structure B1 by bolts. A spiral guide plate two 31a is welded on the inner wall of the carbonization furnace tube. Under the rotation of the furnace tube and the push of the guide plate, the material continues to move forward and finally reaches the discharge end.

[0056] Furthermore, the support of the carbonization section adopts the same support module 4 as that of the puffing section, and a protective cover is installed outside each support module to prevent human contact and ensure safe production.

[0057] Furthermore, the discharge cooling structure is similar to the feed cooling structure. Since the temperature of the sixth heating module in the carbonization section is 1400°C, the cavity volume of the discharge cooling structure B1 is increased at this high temperature, and cooling water with a faster flow rate is introduced to cool it down, which also optimizes the grease sealing effect.

[0058] Small holes are opened on the feed and discharge ends and the static ring of the dynamic and static sealing unit to connect the gas pipelines, and by controlling the flow rate of each gas path, the entire rotary furnace body is in a negative pressure state, so that the gas flows from the feed end A to the discharge end B, and the hydrogen introduced combines with the oxygen generated by the reaction of graphene oxide to generate water vapor, which flows to the exhaust pipe of the storage system under negative pressure;

[0059] The graphene oxide particles are transported to the feed end A of the puffing furnace body through the feeding system. The puffing furnace body 1 is provided with a temperature zone. The temperature of the puffing heating system 7 is set to 200°C through the PLC. The puffing furnace tube rotates at a speed of 0.2r / min-0.1r / min. Under the rotation of the puffing furnace tube 11 and the driving of the spiral guide plate 11a, the time for the graphene oxide to be transported from the puffing furnace body inlet to the puffing furnace body outlet is 15 minutes. The volume of the puffed graphene oxide increases to nine times of the original volume. Under the driving force between the materials and the gas flow direction, the puffed graphene oxide passes through the dynamic and static sealing unit. Element 2 reaches the first temperature zone of the carbonization furnace tube 31, the temperature is 400 ℃, the carbonization furnace tube is provided with six temperature zones, the temperature of each temperature zone increases by 200 ℃, the rotation speed of the carbonization furnace tube 31 is 0.1-0.05r / min, and the graphene oxide passes through the six temperature zones of the carbonization furnace body 3 in turn for reduction. The reaction time of the graphene oxide in the carbonization furnace tube 31 is 6 hours. Under the rotation of the carbonization furnace tube 31 and the push of the spiral guide plate 2 31a, the reduced graphene reaches the discharge end B, and after cooling at the discharge end, the graphene falls into the collecting device of the material storage system connected to the carbonization furnace tube flange 311 by its own weight.

[0060] The above contents are only preferred embodiments of the invention. For ordinary technicians in this field, according to the concept of the invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the invention.

Claims

1. A graphene continuous production rotary furnace, characterized in that: It comprises an expansion furnace body (1) and a carbonization furnace body (3) which are connected as one body by a dynamic and static sealing unit (2), wherein the dynamic and static sealing unit (2) is provided with a water cooling structure; The puffing furnace body (1) comprises a puffing furnace tube (11) and a puffing heating system (12); the carbonizing furnace body (3) comprises a carbonizing furnace tube (31) and a carbonizing heating system (32); the puffing heating system and the carbonizing heating system are respectively arranged on the periphery of the puffing furnace tube and the carbonizing furnace tube; the puffing furnace tube and the carbonizing furnace tube are respectively provided with two identical support modules (4) for support; and a second spiral guide plate (31a) is welded on the inner wall of the carbonizing furnace tube; The dynamic and static sealing unit (2) comprises a dynamic ring flange plate 1 (21) and a dynamic ring flange plate 2 (22), a static ring (23) and a sealing support (24); the dynamic ring flange plate 1 (21) and the dynamic ring flange plate 2 (22) are installed on the inner side of the static ring (23) and are located on the same axis; the dynamic and static sealing unit (2) and the expansion furnace tube (11) and the carbonization furnace tube (31) are located on the same axis.

2. A graphene continuous production rotary furnace according to claim 1, characterized in that: The puffing furnace tube (11) comprises a flange plate 1 (111), a flange plate 2 (112), a sprocket (113), an annular guide rail 1 (114) and an annular guide rail 2 (115). The puffing furnace tube (11) is a cylindrical pipe. The flange plate 1 (111) is welded on the left side of the outer surface of the puffing furnace tube (11), and the annular guide rail 1 (114) is welded on the right side of the flange plate 1 (111); the flange plate 2 (112) is welded on the right side of the puffing furnace tube (11), the sprocket (113) is welded on the left side of the flange plate 2 (112), and the annular guide rail 2 (115) is welded on the left side of the sprocket (113); and the spiral material guide plate 1 (11a) is welded on the inner wall of the puffing furnace tube.

3. The graphene continuous production rotary furnace according to claim 1, characterized in that: The carbonization furnace tube (31) comprises a flange plate three (311), a flange plate four (312), a flange plate five (313), an annular guide rail three (314), and an annular guide rail four (315); the carbonization furnace tube (31) is a cylindrical pipe; the flange plate three (311) is welded to the left side of the carbonization furnace tube (31); the flange plate four (312) is welded to the outer surface of the carbonization furnace tube and is located on the right side of the flange plate three (311); The annular guide rail three (314) is welded to the outer surface of the carbonization furnace tube and is located on the right side of the flange plate four (312); the flange plate five (313) is welded to the right side of the carbonization furnace tube (31); and the annular guide rail four (315) is welded to the carbonization furnace tube (31) and is located on the left side of the flange plate five (313).

4. The graphene continuous production rotary furnace according to claim 1, characterized in that: The moving ring flange plate 1 (21) is located on the left side of the moving and static sealing unit (2) and is connected to the flange plate 5 (313) on the carbonizing furnace tube (31) by bolts. The moving ring flange plate 2 (22) is located on the right side of the moving and static sealing unit (2) and is connected to the flange plate 1 (111) on the expanding furnace tube (11) by bolts. The stationary ring (23) and the sealing support (24) are welded to form a cavity. A retaining ring is provided in the middle of the stationary ring (23) to play an axial limiting role for the expanding furnace tube (11) and the carbonizing furnace tube (31). The inner wall of the stationary ring (23) is provided with an annular groove 1 (23a) and an annular groove 2 (23b) on the left and right sides respectively for grease sealing. A water outlet (24a) is provided at the upper end of the sealing support (24) and a water inlet (24b) is provided at the lower end. The lower end of the sealing support (24) is welded to a bottom plate, and the bottom plate is connected to the frame (5).

5. The graphene continuous production rotary furnace according to claim 1, characterized in that: The support module (4) comprises a roller (41), a rotating spindle (42), and a bearing support (43); the roller (41) and the rotating spindle (42) are connected via a key; the rotating spindle (42) and the bearing support (43) are cooperatively connected; and the bearing support (43) is connected to the frame (5) via bolts.

6. The graphene continuous production rotary furnace according to claim 1, characterized in that: The expansion heating system and the carbonization heating system are both installed inside the heat preservation box.

7. A graphene continuous production rotary furnace according to claim 6, characterized in that: The expansion heating system (12) and the carbonization heating system (32) both comprise a carbon silicon rod (71), a ceramic ring (73), and an insulating seat (72); the carbon silicon rod (71) is mounted on the inner wall of the ceramic ring (73) as a heating component; the ceramic ring (73) is mounted on the insulating seat (72); and the insulating seat (72) is mounted in a heat-insulating box (6).

8. A graphene continuous production rotary furnace according to claim 7, characterized in that: The heat preservation box body (6) is divided into an upper box body (61) and a lower box body (62). The upper box body (61) includes a front end cover plate (611), and the front end cover plate (611) is connected to a box body bracket (612) through a hinge (611). An "L"-shaped channel steel (613) is installed below the front end cover plate (611), and a handle is installed above the channel steel (613). The lower box body (62) includes a handle (2) installed on the front end cover plate (621), and the front end cover plate (621) is installed on the frame (5) through a hinge (612).

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