An internal heating continuous rotary heating process and apparatus

Abstract

The present application relates to a kind of internal heating type continuous rotary heating process and device, device includes self-heating graphite tube rotary drum, electrode bar, the inner cylinder of the self-heating graphite tube rotary drum is graphite tube, both ends of the graphite tube are connected electric slip ring, and are heated by electrode bar power supply.The present application provides a kind of internal heating type continuous rotary heating device compared with prior art, the inner cylinder of the self-heating rotary kiln of the present application adopts graphite material, graphite cylinder both ends adopt slip ring power supply, graphite tube relies on its resistance heating, and heating electric power is adjusted according to set furnace temperature.The furnace temperature of the present application can be high, can be low, from several hundred degrees to thousands of degrees (2000 ℃ above) can be continuously adjusted, heated material can be powder or granular material, protective gas is inhaled in furnace, presents slightly positive pressure or slightly negative pressure, since it can be isolated air, especially suitable for the coating of carbon material, low-temperature carbonization, high-temperature carbonization can also realize the heating treatment of other materials.

Description

TECHNICAL FIELD

[0001] The present application relates to industrial furnace equipment, in particular to an internal heating type continuous rotary heating process and device. BACKGROUND

[0002] There are two kinds of current rotary kiln heating methods: 1) indirect heating - external heating type; 2) direct heating - internal lining with refractory material, flame heating.

[0003] 1) Indirect heating - external heating type, which is heating outside the rotary cylinder, and transferring heat to the material in the cylinder through the tube wall. Since the large output cylinder can only use heat-resistant steel material, the following limitations are caused: first, the heating temperature of the shell is greatly limited and it is difficult to reach above 1200℃, so the process requiring high temperature heating cannot be realized; especially when the carbon material is heated to above 1000℃, the heat-resistant steel cylinder is seriously carburized, and the service life is greatly shortened. In addition, the battery negative carbon material is strictly prohibited from iron pollution, and the use of heat-resistant steel cylinder will cause iron pollution, which is also a heating method that needs to be prohibited.

[0004] 2) Direct heating - flame heating, which cannot heat materials that can be oxidized or burned in the flame, especially materials with high added value, such as carbon material coating and graphite coating carbonization or near-end negative material high temperature treatment.

[0005] The patent document with application number 201410773125.8 discloses an "electric heating continuous internal heating type high temperature rotary furnace", which can be used continuously at 300-2000℃ through graphite tube self-heating. However, the graphite tube power heating method is to wrap an induction heating coil outside the graphite, which uses induction heating. The induction coil will generate heat loss due to eddy current. These generated heat needs to be taken away by the cooling medium, otherwise the induction coil will be burned out, reducing the utilization rate of electric energy. SUMMARY

[0006] The purpose of the present application is to provide an internal heating type continuous rotary heating process and device. The self-heating rotary device furnace temperature of the present application can be high or low, and can be continuously adjusted from a few hundred degrees to thousands of degrees (above 2000℃). The heated material can be powder or granular material. The furnace is filled with protective gas, which is slightly positive or slightly negative pressure. Since it can isolate air, it is especially suitable for carbon material coating, low temperature carbonization, high temperature carbonization, and can also realize the heating treatment of other materials.

[0007] In order to achieve the above purpose, the following technical solutions are adopted in the present application:

[0008] An internal heating type continuous rotary heating process, comprising the following steps:

[0009] 1) The material is fed into the self-heating graphite tube rotary drum through the screw feeder, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube, the graphite tube is heated by electric slip ring contact with the power receiving electrode rod, and the material in the graphite tube is heated;

[0010] 2) The rotary kiln is inclined downward as a whole from the feeding end to the discharging end, and the rotation adopts frequency conversion speed regulation transmission, and the material is conveyed to the discharging end while being heated;

[0011] 3) During the rotation of the self-heating graphite tube rotary drum, the power receiving electrode rod is constantly pressed by the spring to keep close contact with the electric slip ring.

[0012] A device for an internal heating type continuous rotary heating process, comprising a self-heating graphite tube rotary drum and a power receiving electrode rod, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube, both ends of the graphite tube are connected with electric slip rings, and the graphite tube is heated by the power receiving electrode rod.

[0013] It also includes a feeding fixed end, a discharging fixed end, a self-adaptive multi-layer sealing device, and a sealing alignment device, both ends of the self-heating graphite tube rotary drum are connected with the feeding fixed end and the discharging fixed end, respectively, and the self-adaptive multi-layer sealing device is arranged at the connection between the self-heating graphite tube rotary drum and the feeding fixed end and the discharging fixed end, and the self-adaptive multi-layer sealing device adjusts the concentricity with the self-heating graphite tube rotary drum through the sealing alignment device.

[0014] The discharging fixed end comprises a steel structure shell, a refractory insulation material layer, a plug valve, a rotary unloader, and a discharge expander, the steel structure shell is wrapped outside the refractory insulation material layer, the inside of the refractory insulation material layer is a discharging cavity, the discharging end of the self-heating graphite tube rotary drum is inserted into the discharging cavity, the power receiving electrode rod penetrates into the discharging cavity and contacts with the electric slip ring on the graphite tube, and the plug valve, the rotary unloader and the discharge expander are sequentially arranged at the bottom of the discharging cavity.

[0015] The feeding fixed end comprises a steel structure shell, a refractory insulation material layer, a screw feeder, a discharging pipe, and a plug valve, the steel structure shell is wrapped outside the refractory insulation material layer, the inside of the refractory insulation material layer is a feeding cavity, the feeding end of the self-heating graphite tube rotary drum is inserted into the feeding cavity, the screw feeder is connected with the feeding end of the self-heating graphite tube rotary drum, the power receiving electrode rod penetrates into the feeding cavity and contacts with the electric slip ring on the graphite tube, and the discharging pipe is arranged at the bottom of the feeding cavity, and the plug valve is installed on the discharging pipe.

[0016] The adaptive multi-layer sealing device comprises a flexible sealing ring, a graphite sealing ring, an outer fixed tube and an inner sealing tube, the inner sealing tube is connected with a self-heating graphite tube rotary cylinder through a sealing centering device, a plurality of flexible sealing rings are arranged axially between the inner sealing tube and the outer fixed tube, and the graphite sealing ring is arranged at the innermost side of the flexible sealing rings, and the outer fixed tube is connected with a feeding fixed end or a discharging fixed end.

[0017] The bottom of the feeding fixed end and the discharging fixed end is provided with a roller and a track, and the feeding fixed end and the discharging fixed end are connected with a heavy hammer through a steel wire rope respectively.

[0018] The sealing centering device comprises a pitch adjusting lead screw and a corrugated expander, the self-heating graphite tube rotary cylinder is connected with the adaptive multi-layer sealing device through the pitch adjusting lead screw, and the corrugated expander is further arranged between the self-heating graphite tube rotary cylinder and the adaptive multi-layer sealing device for sealing.

[0019] The automatic compensator is used for applying pressure to the current collecting electrode rod, so that constant contact between the current collecting electrode rod and the electric slip ring can be maintained.

[0020] The automatic compensator comprises a spring, a guide rod, an upper support and a lower support, the guide rod is fixed on the feeding fixed end or the discharging fixed end, the spring is sleeved on the guide rod, the upper support and the lower support are arranged at the two ends of the spring, the upper support is fixedly connected with the guide rod, the lower support is slidably connected with the guide rod, and the lower support is fixedly connected with the current collecting electrode rod.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The present application provides an internal heating type continuous rotary heating process and device, the internal cylinder of the self-heating rotary kiln is made of graphite material, the graphite cylinder is powered by a slip ring at both ends, the graphite tube generates heat by its own resistance, the heating electric power is adjusted according to the set furnace temperature, the outer side of the graphite tube is provided with refractory insulation material, the outer side of the insulation material is a transmission sealing steel shell, both ends of the rotary cylinder are the feeding end and the discharging end, the whole furnace is in a sealed environment, the furnace temperature can be high or low, and continuous adjustment from several hundred degrees to thousands of degrees (more than 2000 DEG C) can be realized, the heated material can be powder or granular material, the furnace is filled with protective gas in a micro-positive pressure or micro-negative pressure, and the graphite cylinder is particularly suitable for the coating of carbon materials due to the air isolation, the high-temperature carbonization can also be realized, and the heating treatment of other materials can also be realized.

[0023] If the induction coil is heated, heat will be generated due to eddy current loss, which must be dissipated, otherwise the induction coil will be burned, so the whole induction coil must be cooled, reducing the utilization of electric energy. The present application directly supplies power to the power receiving electrode rod without eddy current loss, and only the heat generated by the direct resistance of the power receiving electrode rod and the heat generated by the local heat transfer of the graphite cylinder need to be cooled, greatly reducing the heat loss. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the overall structure schematic diagram of the present application;

[0025] Figure 2 is the partial enlarged view of the discharge end of the present application;

[0026] Figure 3 is the partial enlarged view of the feed end of the present application;

[0027] Figure 4 is the structure schematic diagram of the adaptive multi-layer sealing device of the present application.

[0028] In the figure: 1-power receiving electrode rod, 2-automatic compensator, 3-adaptive multi-layer sealing device, 4-graphite pipe, 5-rotary kiln supporting roller, 6-rotary kiln transmission, 7-explosion-proof valve, 8-intermediate charging tank, 9-screw feeder, 10-insertion valve, 11-rotary discharger, 12-discharging corrugated expander, 13-electric slip ring, 14-steel structure shell, 15-refractory insulation material layer, 16-observation and temperature measurement hole, 17-water cooling pipe, 18-graphite sealing ring, 19-flexible sealing ring, 20-cooling air nozzle, 21-inner sealing pipe, 22-distance adjusting lead screw, 23-corrugated expander, 24-exhaust port, 25-silo discharge valve, 26-corrugated compensator, 27-discharging pipe, 28-power supply bus, 29-fixed wheel, 30-steel wire rope, 31-guide wheel, 32-weight, 33-guide wheel stand, 34-rail, 35-roller, 36-supporting side frame. DETAILED DESCRIPTION

[0029] The specific embodiment of the present application will be further described below in combination with the drawings:

[0030] See Figure 1 , an internal heating type continuous rotary heating process, comprising the following steps:

[0031] 1) The material is sent into the self-heating graphite pipe rotary cylinder through the screw feeder, the inner cylinder of the self-heating graphite pipe rotary cylinder is a graphite pipe, the graphite pipe is connected to the power receiving electrode rod through the electric slip ring to generate heat by electrification, and the material in the graphite pipe is heated;

[0032] 2) The rotary kiln is inclined downward as a whole from the feed end to the discharge end, the rotation adopts variable frequency speed regulation transmission, and the material is conveyed to the discharge end while being heated;

[0033] 3) The self-heating graphite tube rotary drum applies constant pressure to the power receiving electrode rod through the spring during rotation, so that the power receiving electrode rod always maintains close contact with the electric slip ring.

[0034] See Figures 1-4 The inner hot type continuous rotary heating device comprises a self-heating graphite tube rotary drum and a power receiving electrode rod 1, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube 4, both ends of the graphite tube 4 are connected with an electric slip ring 13, and the graphite tube 4 is heated by the power receiving electrode rod 1.

[0035] It also comprises a feeding fixed end, a discharging fixed end, a self-adaptive multi-layer sealing device 3, and a sealing centering device. Both ends of the self-heating graphite tube rotary drum are connected with the feeding fixed end and the discharging fixed end respectively. The self-adaptive multi-layer sealing device 3 is arranged at the connection between the self-heating graphite tube rotary drum and the feeding fixed end and the discharging fixed end. The self-adaptive multi-layer sealing device 3 adjusts the concentricity with the self-heating graphite tube rotary drum through the sealing centering device.

[0036] See Figure 2 The discharging fixed end comprises a steel structure shell 14, a refractory insulation material layer 15, a plug valve 10, a rotary discharger 11, and a discharging corrugated expander 12. The steel structure shell 14 is wrapped outside the refractory insulation material layer 15. The inside of the refractory insulation material layer 15 is a discharging cavity. The discharging end of the self-heating graphite tube rotary drum is inserted into the discharging cavity. The power receiving electrode rod 1 penetrates into the discharging cavity and contacts the electric slip ring 13 on the graphite tube 4. The plug valve 10, the rotary discharger 11, and the discharging corrugated expander 12 are sequentially arranged at the bottom of the discharging cavity. The discharging fixed end is also provided with an explosion-proof valve 7 and an observation temperature measuring hole 16.

[0037] See Figure 3 The feeding fixed end comprises a steel structure shell 14, a refractory insulation material layer, a spiral feeder 9, a discharging pipe 27, and a plug valve 10. The steel structure shell 14 is wrapped outside the refractory insulation material layer. The inside of the refractory insulation material layer is a feeding cavity. The feeding end of the self-heating graphite tube rotary drum is inserted into the feeding cavity. The spiral feeder 9 is connected with the feeding end of the self-heating graphite tube rotary drum. The power receiving electrode rod 1 penetrates into the feeding cavity and contacts the electric slip ring 13 on the graphite tube 4. The discharging pipe 27 is arranged at the bottom of the feeding cavity, and the plug valve 10 is installed on the discharging pipe 27. The feeding fixed end is also provided with an air outlet 24. The spiral feeder 9 extends into the feeding cavity from the side of the feeding fixed end and is connected with the graphite tube 4. A corrugated compensator is arranged between the part of the spiral feeder 9 outside the feeding fixed end and the feeding fixed end for feeding sealing. The feeding port of the spiral feeder 9 is connected with an intermediate charging tank 8. The discharging port at the bottom of the intermediate charging tank 8 is provided with a plug valve 10, a bin discharging valve 25, and a corrugated compensator 26.

[0038] See Figure 2 , Figure 3 , Figure 4 The adaptive multi-layer sealing device 3 comprises a flexible sealing ring 19, a graphite sealing ring 18, an outer fixed tube, an inner sealing tube 21 connected to the self-heating graphite tube rotating drum through a sealing centering device, and a plurality of flexible sealing rings 19 arranged axially between the inner sealing tube 21 and the outer fixed tube, and a graphite sealing ring 18 arranged at the innermost side of the flexible sealing rings 19. The outer fixed tube is connected to the upper feeding fixed end or the discharging fixed end through bolts.

[0039] The bottom of the upper feeding fixed end and the discharging fixed end is provided with a roller 35 and a track 34, and the upper feeding fixed end and the discharging fixed end are connected to a heavy hammer 32 through a steel wire rope 30. A fixed wheel 29 is fixed on the steel structure shell of the upper feeding fixed end and the discharging fixed end, one end of the steel wire rope is fixedly connected to the fixed wheel 29, and the other end is connected to the heavy hammer 32 through a guide wheel 31.

[0040] The outer side of the flexible sealing ring 19 is connected to the outer fixed tube, and the flexible sealing ring 19 and the inner sealing tube 21 form a contact seal. The outer side of the graphite sealing ring 18 is connected to the outer fixed tube, the inner side is connected to the inner sealing tube 21, and the middle is an axial contact sealing surface. Due to long-term working wear, a gap will be generated at the axial contact sealing surface of the graphite sealing ring 18. The upper feeding fixed end or the discharging fixed end can drive the outer fixed tube to displace through the heavy hammer 32 to automatically compensate for the gap of the axial contact sealing surface.

[0041] When the friction sealing surface of the graphite sealing ring 18 wears and generates a gap, the adaptive multi-layer sealing device 3 can make the upper feeding fixed end and the discharging fixed end walk on the track through the roller under the action of the heavy hammer 32 to automatically compensate for the wear gap. By adjusting the weight of the heavy hammer 32 to apply a constant pressure to the friction sealing surface, the sealing surface can always be zero gap, meeting the requirements of automatic adaptive sealing.

[0042] The sealing centering device comprises a pitch adjusting screw 22 and a corrugated expander 23. The self-heating graphite tube rotating drum is connected to the adaptive multi-layer sealing device 3 through the pitch adjusting screw 22, and the corrugated expander 23 is arranged between the self-heating graphite tube rotating drum and the adaptive multi-layer sealing device 3 for sealing.

[0043] The pitch adjusting screw 22 is provided with a nut in the middle and a screw at both ends. The length of the pitch adjusting screw 22 is adjusted by screwing the nut, so as to adjust the radial distance between the adaptive multi-layer sealing device 3 and the self-heating graphite tube rotating drum. In the circumferential direction, the sealing surface cylinder and the rotary kiln are concentric through the adjustment of the screw. The corrugated expander 23 plays a sealing role between the inside and outside of the kiln and can provide position compensation during debugging.

[0044] After the self-heating graphite tube rotary drum cylinder is installed in place, the manual sealing surface alignment is carried out, that is, the concentricity of the multi-layer sealing device and the self-heating graphite tube rotary drum is adjusted, and several distance adjusting lead screws 22 play the role of adjusting the concentricity and supporting the multi-layer sealing device, so that the purpose of adjusting the concentricity during construction and debugging is achieved.

[0045] The automatic compensator 2 applies pressure to the power receiving electrode rod 1, which can maintain constant contact between the power receiving electrode rod 1 and the electric slip ring 13. The power receiving electrode rod 1 is provided with a water-cooled heat dissipation device.

[0046] The automatic compensator 2 includes a spring, a guide rod, an upper bracket, and a lower bracket. The guide rod is fixed on the feeding fixed end or the discharging fixed end. The spring is sleeved on the guide rod. The upper bracket and the lower bracket are at both ends of the spring. The upper bracket is fixedly connected with the guide rod. The lower bracket is slidably connected with the guide rod. The lower bracket is fixedly connected with the power receiving electrode rod 1. The power receiving electrode rod 1 extends into the discharging cavity or the feeding cavity. A corrugated compensator is installed between the power receiving electrode rod 1 and the steel structure shell 14 for sliding sealing between the discharging cavity or the feeding cavity of the power receiving electrode rod 1.

[0047] The power receiving electrode rod 1 and the graphite tube 4 are powered through the electric slip ring 13. Since the graphite tube 4 may bounce or be eccentric during rotation, a gap will be generated between the electric slip ring 13 and the graphite tube 4, the resistance will increase, an electric arc will be generated, the electric slip ring 13 and the graphite tube 4 will be ablated, the resistance will be further increased, and several undesirable results will occur: increased resistance, no power supply, no heating capacity, and shortened service life of the electric slip ring 13 and the graphite tube 4. The spring balancing device is adopted for the power receiving electrode rod 1 in the present application, a constant pressure is applied between the electric slip ring 13 and the graphite tube 4, and the electric slip ring 13 and the graphite tube 4 are in close contact regardless of the bounce or eccentricity of the rotary drum, and the contact resistance is minimized.

[0048] The self-heating graphite tube rotary drum includes a graphite tube 4, a layer of refractory insulation material wrapped outside the graphite tube 4, and a steel shell fixed outside the layer of refractory insulation material.

[0049] The self-heating rotary heating device of the present application is particularly suitable for heating treatment of carbon (graphite) materials, without pollution or oxidation, and can also achieve high-temperature heating. The rotary kiln is arranged on a whole steel platform at a certain inclination angle, the platform angle can be adjusted, the angle is adjusted from 0° to 5° according to the material condition, and variable frequency speed regulation is adopted for transmission. By changing the inclination angle and the speed, the speed of the rotary kiln conveying the material can be adjusted.

Claims

1. An internally heated continuous rotary heating process, characterized in that, It comprises the following steps: 1) The material is sent into the self-heating graphite tube rotary drum through the screw feeder, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube, the graphite tube is heated by the power supply electrode rod through the electric slip ring contact, and the material in the graphite tube is heated; 2) The rotary kiln is inclined downward as a whole from the feeding end to the discharging end, the rotation adopts frequency conversion speed regulation transmission, and the material is conveyed to the discharging end while being heated; 3) In the process of rotating the self-heating graphite tube rotary drum, the power supply electrode rod is constantly pressed by the spring to keep close contact with the electric slip ring; The device used in the inner heating type continuous rotary heating process comprises a self-heating graphite tube rotary drum and a power supply electrode rod, the inner cylinder of the self-heating graphite tube rotary drum is a graphite tube, the two ends of the graphite tube are connected with electric slip rings, and the graphite tube is heated by the power supply electrode rod; It also comprises a feeding fixed end, a discharging fixed end, a self-adaptive multi-layer sealing device and a sealing centering device, the two ends of the self-heating graphite tube rotary drum are connected with the feeding fixed end and the discharging fixed end respectively, the self-adaptive multi-layer sealing device is arranged at the connection between the self-heating graphite tube rotary drum and the feeding fixed end and the discharging fixed end, and the self-adaptive multi-layer sealing device adjusts the concentricity with the self-heating graphite tube rotary drum through the sealing centering device; The sealing centering device comprises a distance adjusting screw and a corrugated expander, the self-heating graphite tube rotary drum is connected with the self-adaptive multi-layer sealing device through the distance adjusting screw, and the corrugated expander is further arranged between the self-heating graphite tube rotary drum and the self-adaptive multi-layer sealing device for sealing.

2. A process according to claim 1, wherein The discharging fixed end comprises a steel structure shell, a refractory insulation material layer, a plug valve, a rotary unloader and an unloading expander, the steel structure shell is wrapped outside the refractory insulation material layer, the inside of the refractory insulation material layer is a discharging cavity, the discharging end of the self-heating graphite tube rotary drum is inserted into the discharging cavity, the power supply electrode rod penetrates into the discharging cavity and contacts with the electric slip ring on the graphite tube, and the plug valve, the rotary unloader and the unloading expander are sequentially arranged at the bottom of the discharging cavity.

3. A process according to claim 1, wherein The feeding fixed end comprises a steel structure shell, a refractory insulation material layer, a screw feeder, a discharging pipe and a plug valve, the steel structure shell is wrapped outside the refractory insulation material layer, the inside of the refractory insulation material layer is a feeding cavity, the feeding end of the self-heating graphite tube rotary drum is inserted into the feeding cavity, the screw feeder is connected with the feeding end of the self-heating graphite tube rotary drum, the power supply electrode rod penetrates into the feeding cavity and contacts with the electric slip ring on the graphite tube, and the discharging pipe is arranged at the bottom of the feeding cavity and the plug valve is mounted on the discharging pipe.

4. A process according to claim 1, wherein The self-adaptive multi-layer sealing device comprises a flexible sealing ring, a graphite sealing ring, an outer fixed tube and an inner sealing tube, the inner sealing tube is connected with the self-heating graphite tube rotary drum through the sealing centering device, a plurality of flexible sealing rings are arranged between the inner sealing tube and the outer fixed tube in the axial direction, the graphite sealing ring is arranged at the innermost side of the plurality of flexible sealing rings, and the outer fixed tube is connected with the feeding fixed end or the discharging fixed end.

5. A process according to claim 1, wherein The bottom of the feeding fixed end and the discharging fixed end is provided with a roller and a track, and the feeding fixed end and the discharging fixed end are connected with heavy hammers through steel wires respectively.

6. A process according to claim 1, wherein The automatic compensator can apply pressure to the power receiving electrode rod, so that the power receiving electrode rod and the electric slip ring can be kept in constant contact.

7. A process according to claim 6, wherein the heating is carried out in a continuous, internally heated rotary kiln. The automatic compensator comprises a spring, a guide rod, an upper support and a lower support, the guide rod is fixed on the feeding fixed end or the discharging fixed end, the spring is sleeved on the guide rod, the upper support and the lower support are located at two ends of the spring, the upper support is fixedly connected with the guide rod, the lower support is slidably connected with the guide rod, and the lower support is fixedly connected with the power receiving electrode rod.

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