A metal induction kettle capable of dynamic stirring

Abstract

The present invention discloses a metal induction kettle capable of dynamic stirring, and belongs to the technical field of high-temperature reaction kettles. It comprises a support seat and a kettle body, wherein a driving device is arranged in the support seat, and the driving device is connected to the main shaft of the kettle body through a coupling, and the kettle body comprises at least one expansion joint and at least two cylinders, and the two ends of the expansion joint are respectively fixedly connected to the two cylinders, and the cylinders are all fixedly connected to the support seat, and electromagnetic coils are respectively wound around the outer sides of the plurality of cylinders for directly heating the metal cylinders, and the support seat is a three-dimensional frame setting, and the kettle body is suspended in the frame. The present invention adopts an induction heating method, and the induction heating directly heats the metal cylinder, so that the material can be directly subjected to the heat radiation of the cylinder, and the cylinder design adopts a large expansion joint to overcome the axial expansion caused by the heating of the metal cylinder, and also prevents the cylinder from twisting and deforming, avoids the cylinder from scratching with the internal stirring device, and can also help the furnace body to restore to its initial state when cooling.

Description

Technical Field

[0001] The invention relates to a metal induction kettle capable of dynamic stirring, belonging to the technical field of high-temperature reaction kettles. Background Art

[0002] Carbon and its modified materials are the most common negative materials in lithium-ion batteries and have been widely used. This is because carbon negative electrode materials have the advantages of low electrode potential, discharge stability, and good electrical conductivity. At present, carbon negative electrode materials mainly include natural graphite, coke, soft carbon, hard carbon and graphite oxide, and even graphene materials with better performance have been developed. However, for a single carbon negative electrode material, its discharge specific capacity is low, only reaching 372 mAh / g, which is far lower than the application requirements in industry. This is also the main reason why carbon negative electrode materials are limited in application. Therefore, in order to solve this problem, it is necessary to modify the single carbon negative electrode material, mainly to improve its overall electrochemical performance. At present, its electrochemical performance can be improved by coating granulation, doping and other methods.

[0003] The commonly used coating granulation equipment currently uses ordinary 304 stainless steel, and the outside of the shell is heated by a resistance wire; the carbonization equipment uses an internal graphite liner, and the high-aluminum brick shell is heated internally by a resistor. Since the coating granulation carbonization equipment is to realize the coating granulation process and the carbonization process simultaneously inside a single device, there must be a rotating agitator during the process. Non-metallic stirring devices are very prone to brittle fracture, and friction and impact are bound to occur during their rotation. Non-metallic materials cannot cope with this situation. Currently, existing coating granulation or carbonization equipment all use furnace-type heating equipment, which is mainly composed of a furnace body, a cylinder body and a heating device. The cylinder body is arranged inside the furnace body, and the heating equipment uses electric heating wire resistance heating and is fixed inside the furnace body wall. The cylinder body is heated by thermal radiation. However, due to the structural reasons of the cylinder, such as the drive device and bearing parts at both ends of the cylinder, the top feed port and air inlet of the cylinder, the inner wall of the furnace at both ends and the top of the cylinder is generally not installed with electric heating wires, only the bottom and sides of the furnace are installed. Due to the heating method of thermal radiation, the temperature of the cylinder in all directions is uneven, and there are the following disadvantages: 1. The temperature of the coated granulating equipment is about 600 degrees Celsius, and the temperature during carbonization is about 850 degrees Celsius. Due to the heat transfer loss, the cylinder even needs to be heated to more than 900 degrees Celsius during carbonization. At such a high temperature, uneven heating temperature will cause the cylinder to deform to different degrees at different places, and the side wall of the cylinder in the furnace will arch upward until it breaks; 2. Affected by the heating temperature and cylinder deformation, the general processing capacity of the market equipment is about 7 cubic meters, and the processing efficiency is low; 3. Since the heating equipment uses resistance wire for heating, it is difficult to control the temperature after the heating temperature reaches about 300 degrees. The resistance wire is easy to age and burn out at high temperature, especially the temperature of the coated granulating equipment is about 600 degrees Celsius, and the temperature during carbonization is about 850 degrees Celsius, which is more likely to cause the resistance wire to burn out. Aging. Generally, the service life of the electric heating coil is about 4 months. If a group of heating wires is burned out, the same batch of resistance wires in the entire coated granulation carbonization equipment must be replaced at one time. The maintenance workload is large. The initial cost is low, but the subsequent maintenance and use costs are high. 4. Resistance heating conducts heat to the cylinder by thermal radiation, and the cylinder then transfers the heat to the material. The heat transfer in the middle is hindered. In addition, the entry of protective gas and the emission of high-temperature exhaust gas require more energy to increase the heating capacity, which makes its heating efficiency low and causes direct waste of energy.

[0004] Due to the above reasons, the maximum temperature of its market equipment generally cannot reach the required optimal temperature, and can only reach 30% of the filling volume. If the market equipment increases the filling volume, the heating is not ideal and uniform. Therefore, it is affected by the heating efficiency, heating area and cylinder structure and the filling volume cannot be increased. If the heating temperature is forcibly increased, firstly, the heating is slow and the energy consumption is large. Secondly, the reactor body expands and deforms due to heat, causing the internal measuring points and sensors to be displaced, which will cause the local temperature of the reactor body to be too high and cause serious deformation, causing the reactor body to interfere with the internal agitator, forming a vicious circle. For this reason, the present invention aims to propose a horizontal metal induction reactor with high temperature, fast heating, high heating efficiency and the ability to effectively prevent the reactor body from deformation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a metal induction kettle capable of dynamic stirring, which solves the problems of slow heating, uneven temperature, low heating efficiency and easy deformation under high temperature in the existing market equipment.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0007] A metal induction kettle capable of dynamic stirring comprises a support base and a kettle body, wherein a driving device is arranged in the support base, and the driving device is connected to the main shaft of the kettle body through a coupling, and the kettle body comprises at least one expansion joint and at least two cylinders, and the two ends of the expansion joint are respectively fixedly connected to the two cylinders, and the cylinders are all fixedly connected to the support base, and electromagnetic coils are respectively wound around the outer sides of the plurality of cylinders for directly heating the metal cylinders, and the support base is arranged as a three-dimensional frame, and the kettle body is suspended in the frame, and the upper crossbeam of the frame is used to position the kettle body and constrain the expansion and contraction of the kettle body, and a column is fixedly connected to the middle part of the frame, and a hanging sliding lug is arranged between the column and the expansion joint for limiting the distortion of the cylinder caused by the deformation of the expansion joint.

[0008] As a preferred example, the expansion joint is symmetrically provided with two valleys.

[0009] As a preferred example, the inner wall of the expansion joint is fixedly connected with a slag-proof plate corresponding to the valley groove.

[0010] As a preferred example, one end of the cylinder away from the expansion joint is fixedly connected to a wall panel, and a stress release hole is opened on the wall panel, and the wall panel is fixedly connected to a support seat.

[0011] As a preferred example, the electromagnetic coil is a copper tube, and the copper tube is a square tube or a round tube.

[0012] As a preferred example, a temperature insulation layer is provided between the electromagnetic coil and the cylinder.

[0013] As a preferred example, the electromagnetic coil is suspended on a frame, and the suspension portion is made of insulating and high temperature resistant material.

[0014] As a preferred example, the main shaft is a hollow main shaft for introducing cooling water, and a bearing at one end of the main shaft is axially fixedly arranged, and a bearing at the other end is axially clearance-fittedly arranged.

[0015] As a preferred example, a bidirectional double-layer screw belt structure is arranged on the main shaft, and the bidirectional double-layer screw belt structure includes a screw belt support handle, an outer ring right-pushing screw belt, an inner ring left-pushing screw belt, an outer ring left-pushing screw belt and an inner ring right-pushing screw belt.

[0016] As a preferred example, the bidirectional double-layer spiral ribbon structure further includes an outer scraper and an end scraper.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention adopts induction heating. The electromagnetic coil itself does not generate heat. The eddy current is used to directly heat the barrel. The barrel itself generates heat, so that the temperature of the inner and outer walls of the barrel is consistent and uniform. In addition, the heating method has high thermal efficiency, fast heating, and is easy to reach the required maximum temperature, which indirectly increases the filling amount of the material. The heated barrel is also in direct contact with the material, and the heat is directly transferred to the material to heat it, so the heating efficiency is high and the energy consumption is low.

[0019] 2. The present invention divides the induction heating into two sections, corresponding to the two sections of the cylinder separated by the expansion joint, to avoid the axial expansion of the cylinder on one side superimposed on the axial expansion of the cylinder on the other side, the inlet and outlet are placed on the expansion joint, and at the same time, columns and limiters are also made on the expansion joint to control the deformation and compression of the expansion joint, and control the direction of the overall thermal deformation of the cylinder, to avoid the distortion of the entire cylinder and the scratching of the internal agitator, and there will not be too much misalignment between the temperature measuring point and the area with the highest temperature of induction heating, so as to ensure that the local temperature of the cylinder will not be too high, causing the cylinder to deform.

[0020] 3. The present invention innovatively combines structural design with heating method. The heating method adopted by the present invention has good uniformity, which ensures the uniformity of heating of the cylinder and makes the expansion degree of each part consistent. The structural setting forcibly limits the expansion direction of the kettle body, reduces its radial expansion, and converts it into axial expansion. The axial expansion is absorbed by the deformation of the expansion joint, and the deformation of the cylinder is avoided to the greatest extent while heating at ultra-high temperature. Therefore, the processing capacity of the high-temperature reactor can reach about 14 cubic meters, which greatly improves the processing efficiency.

[0021] 4. The spindle of the present invention adopts a hollow spindle and introduces cooling water to prevent the spindle from deformation and strength loss in high temperature areas. At the same time, the clearance fit design at one end of the spindle is used to offset the length difference of inconsistent axial dimensions caused by slow expansion or contraction of the cylinder and the spindle, thereby preventing mechanical stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective structural schematic diagram of the present invention;

[0023] Figure 2 It is a side structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the top view of the structure of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the kettle body;

[0026] Figure 5 It is a schematic diagram of the side structure of the kettle body;

[0027] Figure 6 Schematic diagram of the structure of the main shaft and the spiral belt.

[0028] In the figure: frame 1, drive device 2, coupling 3, drive end bearing structure 4, electromagnetic coil 5, expansion joint 6, valley 61, main shaft 7, tail end bearing structure 8, suspension sliding lug 9, wall panel 10, cylinder 11, protective gas inlet 12, slag prevention plate 13, thermal insulation layer 14, flange 15, discharge port 16, manhole 17, exhaust gas recovery port 18, screw belt support handle 19, outer ring right push screw belt 20, inner ring left push screw belt 21, outer scraper 22, outer ring left push screw belt 23, inner ring right push screw belt 24, end scraper 25. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0030] like Figure 1-6 As shown, a metal induction kettle with dynamic stirring includes a kettle body, a support system, a stirring system, a heating system, a cooling system, a sealing system and a protection system. The support system is set as a rectangular frame 1, and a driving device 2 and a kettle body are arranged in the frame 1. The upper crossbeam of the frame 1 is used to position the kettle body, ensure the verticality of the kettle body, and restrict the expansion and contraction of the kettle body. In addition to the function of the upper crossbeam, the lower crossbeam also supports the weight of the kettle body and the material. The middle crossbeam is used to install the bearing seat, support the weight of the main shaft 7, and restrict the radial movement of the bearing. The left and right columns are used to maintain the rigidity of the upper and lower beams. The outside of the frame 1 is paved with insulation boards to reduce the energy loss of heat radiation outward. Aluminum alloy thin plates are coated on the outside of the insulation boards to increase the beauty of the equipment while reducing the external radiation of the medium-frequency magnetic field. The driving device 2 adopts a reduction gear box + belt drive torque arm suspension solution. During the coating granulation and carbonization process, it only needs to slowly turn the material so that the material is evenly heated and the clumps or blocks generated during the carbonization of organic matter are dispersed.

[0031] The main shaft 7 is a hollow main shaft 7, and adopts a cooling system design of hollow single head + rotary joint circulation. Cooling water circulates inside the main shaft 7. A rotary joint is installed at the cooling water input end, and the rotary joint is installed on the left side of the reduction gear box. The cooling water output end is installed at the other end of the main shaft 7, and water is discharged through the rotary joint; the driving end bearing structure 4 of the main shaft 7 adopts an axial fixed setting, that is, it is fixed with a tightening sleeve on the side close to the reduction gear box, and is completely locked without radial and axial clearance, which is conducive to the installation and fixation of the reduction gear box, convenient maintenance, and controllable direction after extension and retraction. The tail end bearing structure 8 adopts an axial clearance fit setting, uses an axially non-fixed bearing, and the inner ring of the self-aligning bearing and the outer ring of the bearing adopt a clearance fit to facilitate the axial sliding of the shaft in the bearing seat. In a batch of more than 10 hours of production process, the length difference caused by the inconsistent axial dimensions caused by the slow expansion or contraction of the cylinder 11 and the main shaft 7 is offset.

[0032] The driving device 2 is connected to the main shaft 7 of the kettle body through the coupling 3. The kettle body includes an expansion joint 6 and two cylinders 11. The two cylinders 11 are fixedly connected to the frame 1. The two ends of the expansion joint 6 are fixedly connected to the two cylinders 11 respectively. The design advantage of the expansion joint 6 is that it is telescopic and directional, and there is no noise during the telescopic process. In one of the specific embodiments, the expansion joint 6 is symmetrically provided with two valley grooves 61, and a slag prevention plate 13 corresponding to the valley groove 61 is fixedly connected inside the valley groove 61. The slag prevention plate 13 spans the valley groove 61, one end of which is fixed and the other end is movable, which can prevent materials from falling into the valley groove 61. The cylinder 11 adopts a thickness of more than 20 mm. Alloy heat-resistant steel plate, the thicker the steel plate, the more conducive to heat transfer uniformity and cylinder rigidity; the two ends of the kettle body are fixed to the frame 1 through the wall panels 10, so that the kettle body is suspended in the frame 1, and the suspension sliding ears 9 are symmetrically arranged on the outer wall of the expansion joint 6, and the middle support of the column of the frame 1 is provided with a sliding platform matching the suspension sliding ears 9. The sliding platform is axially slidably connected with the suspension sliding ears 9, and its vertical and radial directions are restricted to prevent the expansion joint 6 and the cylinder 11 from rotating and twisting along the axial direction, and support the middle area of ​​the kettle body. A pair of suspension sliding ears 9 are designed on both sides of the center of the cylinder 11 to solve the expansion joint 6. Or the uneven change process during the heating process of the cylinder 11 can maximize the maximum axial elastic change of the cylinder 11; the kettle body adopts a four-corner hollow vertical design, and the wall panels 10 at both ends adopt double-reinforced cooling wall panels. The wall panels 10 use 30mm heat-resistant alloy steel. The non-supporting parts of the wall panels 10 contain some stress release holes and have manholes 17. During the thermal expansion of the wall panels 10, part of the internal stress can be released through these holes, reducing the rigidity requirements of the frame 1. The outside of the cylinder flange 15 is made of a water circulation coil jacket to ensure that the bolts will not be affected by the electromagnetic induction heating and affect the bolt strength. All supporting wall panels 10 The ribs are all equipped with circulating water jackets to ensure the rigidity of both sides; a protective gas inlet 12 is also provided in the middle and upper part of the wall panels 10 on both sides, and the protective gas inlet 12 is arranged obliquely to prevent tar, dry powder, etc. from rushing into the pipeline and clogging the pipeline after cooling. A large amount of nitrogen enters the coated granulation carbonization equipment through the protective gas inlet 12, quickly replacing the oxygen inside the equipment, thereby protecting the main material. A tail gas recovery port 18 is provided in the middle position of the kettle body (on the expansion joint 6), and the tail gas recovery port 18 is connected to the tail gas recovery device. The tail gas recovers gasified tar, carbon powder, nitrogen, etc. At the same time, a feed port and a discharge port 16 are also provided above and below the expansion joint 6, respectively.

[0033] Electromagnetic coils 5 are respectively wound around the outside of the two cylinders 11 for directly heating the metal cylinder 11. In one embodiment, the electromagnetic coil 5 uses a copper tube, which can be a square tube or a round tube. The size cannot be less than 30 mm and the wall thickness cannot be less than 3 mm. The copper tube is arranged slightly sparsely in the middle and densely at both ends. The cylinder 11 is divided into two parts, and the copper tube is also divided into two parts. The spiral winding method is used to wrap the outside of the cylinder 11. The copper tube is suspended on the frame 1. The suspension uses insulating and high-temperature resistant materials, such as ceramics, insulating boards, high-aluminum boards, etc., and the copper tube is insulated separately, painted with insulating paint, and wrapped with insulating tape. In the above structure, since the electromagnetic coil 5 itself basically does not generate heat, it directly heats the metal cylinder 11, and has a long service life without maintenance. There is no maintenance and replacement cost, and the thermal resistance is small and the thermal inertia is low. The temperature of the inner and outer walls of the barrel is consistent, and a large expansion joint 6 is used to overcome the axial expansion caused by the heating of the metal cylinder 11 to the greatest extent; the heating part adopts an annular copper tube structure, and the copper tube itself does not generate heat. After the cooling circulating water is passed, it can withstand a high temperature of more than 600°C. The service life is expected to be up to 10 years, and no maintenance is required during this period, so there is basically no maintenance cost; the cylinder wall is heated by the electromagnetic eddy current, and the heat is fully utilized. After the insulation layer 14 is completed, the heat is concentrated inside the heating body and is basically not lost. The energy-saving heating starts quickly, and the average preheating time is shorter than the resistance coil heating method. The thermal efficiency is as high as 90%, and under the same conditions, it saves 30-70% of electricity and energy consumption compared with the resistance coil heating.

[0034] In the coating granulation process, the outer surfaces of all aggregates of the equipment, such as natural graphite, need to be evenly coated with asphalt powder, etc. Since the aggregates and auxiliary materials are piled together after adding, if they are evenly coated, the agitator needs to be turned quickly, and the auxiliary materials will melt and stick when heated, and the agitator is needed to disperse the packed materials. The thermal conductivity of carbon materials is extremely poor and the temperature resistance is excellent (according to the measured data after production, the temperature difference of carbon powder with an interval of 8 cm can reach 500 degrees Celsius). Any part in contact with the heating source must be scraped by the agitator. For this reason, a bidirectional double-layer spiral ribbon structure is provided on the main shaft 7. The supports between the spiral ribbon and the main shaft 7 are all cut from steel plates to avoid drilling the main shaft 7, affecting the mechanical properties of the main shaft 7, and avoiding cracks in the main shaft 7 after multiple heating and cooling, which causes the coolant in the main shaft 7 to flow into the inside of the coating granulation carbonization equipment. Specifically, the bidirectional double-layer spiral ribbon structure includes a spiral ribbon support handle 19, an outer ring right push spiral ribbon 2 0. Inner circle left-pushing spiral belt 21, outer circle left-pushing spiral belt 23, inner circle right-pushing spiral belt 24, outer scraper 22 and end scraper 25; when the main shaft 7 rotates, the double-headed outer spiral belt acts on the material in three aspects, axially pushing the material, radially rotating the material and shearing the material between the cylinder wall and the outer spiral belt. On the same circular cross-section, the spiral belt pushes the material in the opposite axial direction due to the opposite rotation direction of the outer spiral belt. The main function of the scraper is to break the massed material that has not been sheared by the outer spiral belt again, and to turn the material inside the cylinder, so that the material heating time is shorter, the material flow at different positions in the cylinder is more frequent, and the heating is more uniform. Another function is to scrape the material close to the wall panel 10 away from the wall panel 10, and push the material axially away from the wall panel 10 in the direction of the main shaft 7, so as to avoid the situation that the part close to the wall panel 10 is not heated due to the lack of electromagnetic coil 5, resulting in low coating or carbonization ratio.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A metal induction kettle capable of dynamic stirring, comprising a frame (1) and a kettle body, wherein a driving device (2) is arranged in the frame (1), and the driving device (2) is connected to a main shaft (7) of the kettle body via a coupling (3), characterized in that: The kettle body comprises at least one expansion joint (6) and at least two cylinders (11), the two ends of the expansion joint (6) are respectively fixedly connected to the two cylinders (11), the cylinders (11) are all fixedly connected to the frame (1), the outer sides of the plurality of cylinders (11) are respectively wound with electromagnetic coils (5) for directly heating the metal cylinders (11), the frame (1) is a three-dimensional frame arrangement, the kettle body is suspended in the frame, the upper crossbeam of the frame is used to position the kettle body and restrict the expansion and contraction of the kettle body, the middle part of the frame is fixedly connected to a column, a suspension sliding lug (9) is arranged between the column and the expansion joint (6) for limiting the distortion of the cylinder body caused by the deformation of the expansion joint (6); the expansion joint (6) is symmetrically provided with two valley grooves (61); The inner wall of the expansion joint (6) is fixedly connected with a slag prevention plate (13) corresponding to the valley groove (61); The end of the cylinder (11) away from the expansion joint (6) is fixedly connected to a wall panel (10), the wall panel (10) being provided with a stress release hole and being fixedly connected to the frame (1); the entire outside of the frame (1) is paved with a thermal insulation board to reduce the energy loss caused by heat radiation outwards, and an aluminum alloy sheet is coated outside the thermal insulation board to increase the aesthetics of the equipment while reducing the external radiation of the medium-frequency magnetic field; The middle and upper part of the wall panel (10) is also provided with a protective gas inlet (12), which is arranged upwardly obliquely to prevent tar and dry powder from rushing into the pipeline and clogging the pipeline after cooling. A large amount of nitrogen enters the interior of the coated granulation carbonization equipment through the protective gas inlet (12) to quickly replace the oxygen inside the equipment, thereby protecting the main material. A thermal insulation layer (14) is provided between the electromagnetic coil (5) and the cylinder (11).

2. A dynamically stirred metal induction kettle according to claim 1, characterized in that: The electromagnetic coil (5) is a copper tube, and the copper tube is a square tube or a round tube.

3. A dynamically stirred metal induction kettle according to claim 2, characterized in that: The electromagnetic coil (5) is suspended on the frame (1), and the suspension portion is made of insulating high-temperature resistant material.

4. The metal induction kettle capable of dynamic stirring according to claim 1, characterized in that: The main shaft (7) is a hollow main shaft used for introducing cooling water, and a bearing at one end of the main shaft (7) is axially fixedly arranged, and a bearing at the other end is axially clearance-fittedly arranged.

5. The metal induction kettle capable of dynamic stirring according to claim 4, characterized in that: The main shaft (7) is provided with a bidirectional double-layer screw belt structure, which comprises a screw belt support handle (19), an outer ring right-pushing screw belt (20), an inner ring left-pushing screw belt (21), an outer ring left-pushing screw belt (23) and an inner ring right-pushing screw belt (24).

6. The metal induction kettle capable of dynamic stirring according to claim 5, characterized in that: The bidirectional double-layer spiral ribbon structure further includes an outer scraper (22) and an end scraper (25).

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