Electromagnetic rotary kiln for calcining limestone

Abstract

The application relates to the technical field of calcining equipment, and discloses an electromagnetic rotary kiln for calcining limestone, wherein a kiln cylinder is installed on the ground, and the head of the kiln cylinder is provided with a feeding pipe; a variable frequency driving system is arranged on the preheating section of the kiln cylinder; a heating module is arranged on the heating section of the kiln cylinder; the heating module comprises an electromagnetic coil, two power supply slip rings are respectively connected to the two ends of the electromagnetic coil; a power supply carbon brush unit is arranged outside the two power supply slip rings, and the two power supply carbon brushes are slidingly installed on a rack through the same carbon brush group rack; a water jacket is arranged around the rear section of the cooling section of the kiln cylinder, a discharge port is formed in the tail end surface of the cooling section, and a discharge channel is arranged at the corresponding position of the tail of the water jacket; a hoist is arranged behind the cooling section to connect the discharge port; and the top end of the hoist is connected with a product bin. The device has high thermal efficiency, high temperature regulation sensitivity, controllable calcining zone temperature, and is suitable for popularization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calcining equipment, in particular to an electromagnetic rotary kiln for calcining limestone. BACKGROUND

[0002] The basic principle of calcining limestone is to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide by means of high temperature. At present, the types of industrial calcining limestone equipment mainly include rotary kiln, shaft kiln, Maerz shaft kiln, etc. The thermal process of calcining limestone in a rotary kiln is as follows: after preheating, limestone and fuel are loaded into the kiln, heated to high temperature to complete calcination, and then unloaded outside the kiln after cooling. The calcining fuel selected is anthracite, coke or coal gas. After high-temperature calcination, a large amount of sulfur dioxide and nitrogen oxides are produced, causing serious pollution and low thermal efficiency.

[0003] In recent years, production enterprises have been committed to researching how to ensure production efficiency while saving energy and reducing emissions. For example, Henan Yueer Environmental Protection Technology Co., Ltd. discloses a limestone powder calcining furnace in the invention patent application CN110790522A. By continuously stirring the stirring mechanism inside the kiln body, the contact between limestone powder and fuel is improved to solve the pollution problem caused by insufficient combustion and reduce the generation of pollutants. Li Fa-kui discloses a limestone calcining shaft kiln in the utility model patent CN202953947U, which improves the shaft kiln to avoid broken dead angles inside the kiln body and improve the crushing efficiency of the material. Zhang Yu discloses a limestone powder calcining rotary kiln in the invention patent application CN112679115A, which makes the flue gas move along the circumference of the kiln body while flowing along the axial direction of the kiln body by rotating the gas guide disc, so that the flue gas and limestone powder are fully contacted, the calcination effect is improved, and the generation of pollutants is reduced. Zhongliu Technology Co., Ltd. discloses a limestone suspension calcining equipment in the invention patent CN111777341B, which fully calcines the limestone powder by the fan blade stirring of the stirrer and the jet, and uses multiple jet ports to rotate the airflow in the Venturi tube, greatly extending the calcination time of the limestone powder in suspension. The above patents all reduce the generation of pollutants by improving the combustion efficiency of fuel to reduce the generation of pollutants caused by insufficient combustion. However, increasing the contact area of fuel and limestone, introducing oxygen and other methods can only improve the combustion efficiency as much as possible. Incomplete combustion of fuel is an objective fact and cannot be completely avoided. The pollution problem caused by incomplete combustion of fuel cannot be solved from the root, so the above research can only reduce the generation of pollutants to different degrees, and cannot achieve clean production.

[0004] In addition, the temperature control system in the calcination kiln body has hysteresis, nonlinearity and other characteristics, which will affect the stability of the calcination temperature of limestone, thereby affecting the calcination effect of the product. The temperature in the kiln body is difficult to control due to the calcination zone, and the calcination or overcalcination phenomenon often occurs, resulting in unstable product quality and additional energy consumption. There are many studies on temperature control in the industry. For example, the traditional PID control algorithm is used, and in the article "Optimization Control Research on Calcination Temperature of Limestone in Lime Kiln" by Zhou Yeming and Chen Legeng of Guilin University of Electronic Technology, a fuzzy immune adaptive PID-Smith prediction control method is used to control the calcination temperature of limestone. The above methods all use simulation-prediction to build a control model and perform simulation control to minimize the impact of hysteresis. Jingxing County Jinghua Calcium Industry Co., Ltd. discloses a limestone calcination device in the practical new type patent CN203451373U, which sets a carbon dioxide concentration detector in the exhaust pipe. The concentration of carbon dioxide can be detected to control the decomposition rate of limestone and the reaction speed. The above methods can reduce the control and adjustment time of the temperature control system and the adjustment system, and reduce the contingency of temperature change in calcination. However, it is difficult to strictly and accurately control the temperature, and the temperature adjustment is not timely, which may cause calcination or overcalcination in the kiln body, resulting in unstable product quality, additional energy consumption, loss of enterprise benefits and unsustainability of enterprise development. SUMMARY

[0005] The present application provides an electromagnetic rotary kiln for calcining limestone to solve the problems of difficult temperature control in the calcination zone of the rotary kiln, frequent calcination or overcalcination, unstable product quality, pollution and high energy consumption in the process of calcining limestone.

[0006] The present application adopts the following technical solutions:

[0007] The utility model provides a kind of calcined limestone's electromagnetic rotary kiln, kiln cylinder is installed on ground by multiple groups of supporting wheel frame, the central part of kiln cylinder head is equipped with feeding pipe, the inlet of feeding pipe is connected with the outlet of belt scale, and raw material bin is equipped above belt scale;Kiln cylinder is sequentially divided into preheating section, heating section, cooling section from head to tail;The outer of preheating section of kiln cylinder is tightly wrapped with heat insulation layer, and frequency conversion driving system is equipped on preheating section;The outer of heating section of kiln cylinder is tightly wrapped with double-layer heat insulation layer, and one or more heating modules are arranged at interval outside double-layer heat insulation layer;Heating module includes electromagnetic coil, electromagnetic coil is wrapped around outside double-layer heat insulation layer, and the both ends of electromagnetic coil are connected with two power supply slip rings respectively, and power supply slip rings are fixed around the heating section of kiln cylinder by connecting plate, and connecting plate is fixed on kiln cylinder;Power supply carbon brush unit is arranged outside two power supply slip rings, and power supply carbon brush unit includes two power supply carbon brushes, and power supply carbon brushes are abutted on the outer ring of power supply slip ring, and two power supply carbon brushes are slidably installed on rack by same carbon brush group frame, and the control system of electromagnetic frequency conversion control cabinet is connected with the pair of two power supply carbon brushes;The front section of cooling section of kiln cylinder is wrapped with heat insulation layer, and water jacket is arranged around the rear section of cooling section, and water jacket rotates synchronously with kiln cylinder, and inlet pipe is arranged at the end axis of water jacket by rotary joint, and branch connection steam pipe is arranged on the stationary part of the outer ring of rotary joint;Discharge port is opened on the tail end surface of cooling section, and discharge channel is arranged at the corresponding position of the tail of water jacket;Elevator is arranged behind cooling section, and the lower inlet of elevator is connected with the discharge end of discharge pipe, and the inlet of discharge pipe is connected with discharge channel for discharging;Product bin is connected with the top end of elevator.

[0008] When implemented, the designed electromagnetic rotary kiln for calcining limestone is 2m in diameter and 58m in length, the head of kiln cylinder is higher than the tail, the inclination is 2.5°~3.5°, preferably 3°, the rotation speed is 0.5~2 turns / min, the kiln cylinder is installed on ground by multiple groups of supporting wheel frame, the central part of kiln cylinder head is equipped with feeding pipe, the inlet of feeding pipe is connected with the outlet of belt scale, and raw material bin is equipped above belt scale;Kiln cylinder is sequentially divided into preheating section, heating section, cooling section from head to tail;

[0009] The length of preheating section of kiln cylinder is 14.5m, which is made of carbon steel material;The outer of preheating section is tightly wrapped with heat insulation layer, which is made of two layers of aluminum silicate insulation felt, with a thickness of 40mm;Frequency conversion driving system is equipped on preheating section, specifically, open gear ring is arranged around preheating section, and open gear ring is connected with driving motor through speed reducer by cooperating with driving gear;

[0010] The heating section length of the kiln cylinder is 30 m, which is made of 310S stainless steel; the heating section is tightly wrapped with double-layer heat insulation layer, the two layers of heat insulation layer are made of two layers of zirconium-containing aluminum silicate insulation felt and two layers of aluminum silicate insulation felt, and the total thickness is 80 mm; one or more heating modules are arranged outside the double-layer heat insulation layer at intervals, the number of heating modules depends on the length of the kiln cylinder and the set production, and the same number of temperature control modules are matched, and the heating temperature is adjusted according to the real-time measured temperature; the heating module comprises an electromagnetic coil, the electromagnetic coil is formed by winding a high-voltage high-frequency electromagnetic wire, the high-voltage high-frequency electromagnetic wire is composed of a plurality of aluminum wires, generally 30-80 square millimeters of soft aluminum wire is selected, the electromagnetic coil is wrapped around the outside of the heat insulation layer, the number of turns of the electromagnetic coil, i.e. the length of the high-voltage high-frequency electromagnetic wire, is determined according to the power size and actual demand, the output power is 80-150 KW, preferably 100-120 KW, a magnetic field is generated by the current passing through the spiral electromagnetic coil, eddy current is induced in the kiln cylinder by electromagnetic induction, and then the kiln cylinder is heated, the two ends of the electromagnetic coil are connected to two power supply slip rings, two electromagnetic coils are arranged in one heating module, the two electromagnetic coils are synchronously and homodirectionally wound, the heads of the two electromagnetic coils are connected to the same power supply slip ring, and the tails of the two electromagnetic coils are connected to the other power supply slip ring; four power supply slip rings are arranged in one heating module in sequence, which are a first power supply slip ring, a second power supply slip ring, a third power supply slip ring and a fourth power supply slip ring in sequence, the two ends of the electromagnetic coil are connected to the first power supply slip ring and the third power supply slip ring, or the two ends of the electromagnetic coil are connected to the second power supply slip ring and the fourth power supply slip ring; all the power supply slip rings are fixed around the heating section of the kiln cylinder through a connecting plate, and the connecting plate is fixed on the kiln cylinder; a power supply carbon brush unit is arranged outside the two power supply slip rings, the power supply carbon brush unit comprises two power supply carbon brushes, the power supply carbon brushes abut against the outer circle of the power supply slip ring, the two power supply carbon brushes are slidably installed on the rack through the same carbon brush group frame, and the two power supply carbon brushes are connected with the control system of the electromagnetic frequency conversion control cabinet; in each heating module, power supply carbon brush units connected to the same control system are symmetrically arranged on both sides of the power supply slip ring, and the two power supply carbon brushes corresponding to the same power supply slip ring in the two power supply carbon brush units are connected through a power supply line;

[0011] The temperature control module comprises a temperature sensor, the temperature sensor is inserted into the double-layer heat insulation layer and closely attached to the kiln cylinder, two ends of the temperature sensor are connected to two signal slip rings respectively, that is, four signal slip rings are arranged in sequence in one temperature control module, which are a first signal slip ring, a second signal slip ring, a third signal slip ring and a fourth signal slip ring in sequence, two ends of the temperature sensor are connected to the first signal slip ring and the third signal slip ring respectively, or two ends of the temperature sensor are connected to the second signal slip ring and the fourth signal slip ring respectively; the signal slip rings are fixed around the heating section of the kiln cylinder through a connecting plate, the connecting plate is fixed on the kiln cylinder, and the side of the signal slip ring close to the power slip ring shares one connecting plate with the power slip ring; a signal carbon brush unit is arranged outside the two signal slip rings, the signal carbon brush unit comprises two temperature measuring carbon brushes, the temperature measuring carbon brushes abut against the outer circle of the signal slip ring, the two temperature measuring carbon brushes are installed on the rack through the same carbon brush group frame, and the two temperature measuring carbon brushes are connected to the control system of the electromagnetic frequency conversion control cabinet; the carbon brush group frame comprises a U-shaped frame, long circular holes are formed in the two side plates of the U-shaped frame correspondingly, a fixing rod is installed between the two long circular holes, in the power carbon brush unit, two carbon brush fixing clamps are installed on each fixing rod, the power carbon brushes are installed on the respective fixing rods through the carbon brush fixing clamps, two power carbon brushes abutting against the same power slip ring are installed on each carbon brush fixing clamp, and the two power carbon brushes are arranged symmetrically upward and downward; similarly, in the signal carbon brush unit, two carbon brush fixing clamps are installed on each fixing rod, the signal carbon brushes are installed on the respective fixing rods through the carbon brush fixing clamps, two temperature measuring carbon brushes abutting against the same signal slip ring are installed on each carbon brush fixing clamp, and the two temperature measuring carbon brushes are arranged symmetrically upward and downward; a sliding block is fixed to the outer side of the top plate of the U-shaped frame, and the sliding block is slidingly installed on the rack through a sliding groove, the sliding groove is a T-shaped groove, and the sliding block can be slidingly embedded in the groove.

[0012] The length of the cooling section of the kiln cylinder is 13.5 m, and the cooling section is made of carbon steel material; the front section of the cooling section is covered with a heat insulation layer, the heat insulation layer is made of two layers of aluminum silicate insulation felt and has a thickness of 40 mm, and the rear section of the cooling section is provided with a water jacket, the length of the water jacket is 8 m, the water jacket is made of boiler steel plate and is internally provided with cooling water to accelerate the cooling speed; the water jacket rotates synchronously with the kiln cylinder, a water inlet pipe is installed at the end axis of the water jacket through a rotary joint, a branch steam pipe is arranged at the stationary part of the outer circle of the rotary joint, heat generated in the cooling process heats the cooling water to a gaseous state, the water vapor is converted and discharged through the steam pipe; four fan-shaped discharge ports are uniformly formed in the tail end face of the cooling section, and the tail part of the water jacket is provided with a discharge channel at the corresponding position; a hoist is arranged at the rear of the cooling section, the lower inlet of the hoist is connected to the discharge end of the discharge pipe, and the inlet end of the discharge pipe is connected to the discharge channel for discharging; the top end of the hoist is connected to a product bin.

[0013] In use, two groups of electromagnetic coils are arranged side by side and wound on the kiln cylinder, the two ends of the electromagnetic coils are connected with the first power slip ring and the third power slip ring respectively, the head and tail of the two electromagnetic coils are fixed at different positions on the same power slip ring, that is, the head of the two electromagnetic coils is connected with the first power slip ring, and the tail of the two electromagnetic coils is connected with the third power slip ring; the two ends of the temperature sensor are connected with the first signal slip ring and the third signal slip ring respectively; the electromagnetic coil rotates with the kiln cylinder, and the electromagnetic coil passes below the slip ring without affecting the rotation; the position of the carbon brush fixed on the fixed rod is adjusted, each power slip ring and each signal slip ring is clamped between the connecting plates, so that the four power carbon brushes fixed on the same fixed rod are respectively abutted on the first power slip ring and the third power slip ring, and the four temperature measuring carbon brushes are respectively abutted on the first signal slip ring and the third signal slip ring, that is, two power carbon brushes are fixed on the same carbon brush fixing clamp one above the other and abutted on the same power slip ring, and two temperature measuring carbon brushes are fixed on the same carbon brush fixing clamp one above the other and abutted on the same signal slip ring; the same arrangement is adopted on the other side of the rack, and the four power carbon brushes are connected with the same set of power slip rings in the same way, and the power carbon brushes abutted on the same power slip ring are connected with the power line; at this time, the second power slip ring and the fourth power slip ring and the second signal slip ring and the fourth signal slip ring are used as backup, and the four power slip rings and the four signal slip rings are used one by one, and the exchange is the same; the driving motor is turned on, the driving motor drives the open gear ring through the speed reducer, and the open gear ring drives the kiln cylinder to rotate; the control system is turned on, the current is connected to the electromagnetic coil through the cooperation of the power carbon brush and the power slip ring, the magnetic field is generated by the current through the spiral electromagnetic coil, the eddy current is induced in the kiln cylinder through electromagnetic induction, and the kiln cylinder is heated; after the material is weighed by the belt scale from the raw material bin and enters the preheating section of the kiln cylinder through the feeding pipe, it enters the heating section after preheating, is calcined by the continuous heating of the cylinder wall in the rotating process, and enters the cooling section after calcination, is cooled by the water jacket in the cooling section, the cooling water enters the water jacket through the rotating joint after entering the water jacket through the water inlet pipe, in the water jacket, the cooling water is heated and heated to a gaseous state, and the pressure increases to become water vapor, which is discharged from the steam pipe, realizing energy recovery; the cooled material enters the discharge channel formed in the water jacket from the discharge port formed in the cooling section, and is discharged from the kiln cylinder into the discharge pipe, and finally enters the product bin through the elevator from the discharge pipe, and the production is completed; during the production process, due to the high calcination temperature, the kiln cylinder expands due to heating, the expansion causes the slip ring fixed on the kiln cylinder to move horizontally, at this time, the power carbon brush fixed on the U-shaped frame moves with the power slip ring, the sliding block on the top plate of the U-shaped frame slides on the sliding groove, ensuring good contact between the carbon brush and the slip ring, and the temperature measuring carbon brush slides with the movement of the signal slip ring; the driving motor is turned off, the kiln cylinder stops rotating, the control system is turned off, the electromagnetic coil is powered off, and the operation is stopped.

[0014] Compared with the prior art, the present application has the following beneficial effects: the electromagnetic rotary kiln for calcining limestone provided by the present application uses the heat energy generated by electromagnetic induction for heating, avoids the use of fuel, changes the previous research idea of improving combustion efficiency, does not need oxygen in the process of calcining limestone by electromagnetic combustion, and therefore does not emit nitrogen oxides, and since coal is not burned, sulfur dioxide is not generated, zero emission of sulfur dioxide and nitrogen oxides is achieved, no desulfurization facilities are needed, the problem of pollutants generated by insufficient combustion of fuel is fundamentally solved, the long-term pollution of lime kiln is completely changed, and clean production is achieved.

[0015] Meanwhile, since the calcining temperature is electrically controlled and can be adjusted at any time, the temperature regulation sensitivity is high, the temperature in the calcining zone is controllable, and the products will not appear under-fired or over-fired, and the product quality is improved. The present application has the advantages of low investment, short construction period, and according to the actual comprehensive measurement, the energy consumption for producing one ton of calcium oxide is 450-550 degrees of electricity, the production cost is 300-350 yuan, the comprehensive energy consumption of the project is reduced by more than 20% compared with the traditional process, energy is effectively saved and production cost is reduced. The device is designed reasonably and reliably, is safe and reliable, has high practical performance, is a more scientific calcining device with the advantages of environmental protection, energy saving, mechanization, automation, and the like, and has very considerable direct and indirect benefits, economic and social benefits, and is suitable for large-area popularization and use.

[0016] In addition, since the kiln cylinder expands and naturally elongates due to heating, the slip ring fixed on the kiln cylinder also moves, and the sliding block fixed outside the kiln cylinder is stationary, which causes poor contact, and after the sliding block and the sliding groove are installed, the carbon brush also moves with the displacement of the slip ring. The device effectively solves the problem of poor contact of the slip ring and the carbon brush due to the expansion and elongation of the kiln cylinder caused by electromagnetic heating. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure of the present application is shown.

[0018] Figure 2 The structure of the cooling section in the present application is shown.

[0019] Figure 3 The structure of the cooling section in the present application is shown. Figure 2 The sectional view along the A-A direction.

[0020] Figure 4 The connection diagram of the power carbon brush and the control system is shown.

[0021] Figure 5 The installation diagram of the signal slip ring and the temperature measuring carbon brush in Example 1 is shown.

[0022] Figure 6 The installation diagram of the power slip ring and the power carbon brush in Example 1 is shown.

[0023] Figure 7 This diagram illustrates the connection between the power supply slip ring and the electromagnetic coil in Example 1.

[0024] In the diagram: 1-Kiln shell, 101-Preheating section, 102-Heating section, 103-Cooling section, 4-Roller frame, 5-Raw material bin, 6-Belt scale, 7-Feed pipe, 8-Insulation layer, 9-Double insulation layer, 10-Open gear ring, 11-Drive motor, 12-Reducer, 13-Control system, 14-Water jacket, 15-Discharge pipe, 16-Elevator, 17-Product bin, 18-Rotary joint, 20-Water inlet pipe, 21-Steam pipe, 22-Temperature sensor, 23-Electromagnetic coil, 2301-Electromagnetic coil I, 2302-Electromagnetic coil II, 24-Signal slip ring, 2401-First signal slip ring, 2402-Second signal slip ring, 2403-Third signal slip ring, 2404-Fourth signal slip ring, 25 - Power slip ring, 2501- First power slip ring, 2502- Second power slip ring, 2503- Third power slip ring, 2504- Fourth power slip ring, 26- Connecting plate, 27- Power carbon brush, 28- Temperature measuring carbon brush, 29- Discharge channel, 30- Discharge port, 31- Slide groove, 32- Slider, 33- U-shaped frame, 34- Fixing rod, 35- Frame, 36- Carbon brush assembly frame. Detailed Implementation

[0025] Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] Example 1

[0027] An electromagnetic rotary kiln for calcining limestone, such as Figure 1 As shown: the kiln body 1 has a diameter of 2m and a length of 58m. The kiln body is high at the head and low at the tail, with an inclination of 2.5°~3.5°, preferably 3°. The rotation speed is 0.5~2 revolutions / min. The kiln body 1 is installed on the ground by multiple sets of support rollers 4. A feed pipe 7 is provided in the center of the head of the kiln body 1. The inlet of the feed pipe 7 is connected to the outlet of the belt scale 6. A raw material bin 5 is provided above the belt scale 6. The kiln body 1 is divided into a preheating section 101, a heating section 102, and a cooling section 103 from head to tail.

[0028] The preheating section 101 of the kiln body 1 is 14.5m long and is made of carbon steel. The preheating section 101 is tightly wrapped with a heat insulation layer 8, which is made of two layers of aluminum silicate insulation felt with a thickness of 40mm. The preheating section 101 is equipped with a frequency conversion drive system. Specifically, the preheating section 101 is equipped with an open gear ring 10, which is connected to the drive motor 11 through a reducer 12 in conjunction with the drive gear.

[0029] The heating section 102 of the kiln cylinder 1 has a length of 30 m and is made of 310S stainless steel; the heating section 102 is tightly wrapped with a double-layer heat insulation layer 9, the double-layer heat insulation layer 9 is respectively made of two layers of zirconium-containing aluminum silicate insulation felt and two layers of aluminum silicate insulation felt, and has a thickness of 80 mm; a plurality of heating modules are arranged outside the double-layer heat insulation layer 9, the number of the heating modules depends on the length of the kiln cylinder and the set production capacity, and a same number of temperature control modules are provided in a matched manner, and the heating temperature is adjusted according to the real-time measured temperature;

[0030] The heating module includes an electromagnetic coil 23, the electromagnetic coil 23 is formed by winding a high-voltage high-frequency electromagnetic wire, the high-voltage high-frequency electromagnetic wire is composed of a plurality of aluminum wires, and generally 30-80 square millimeters of soft aluminum wire is selected, and in the embodiment, 50 square millimeters of soft aluminum wire is selected, the electromagnetic coil 23 includes electromagnetic coil I 2301 and electromagnetic coil II 2302, the electromagnetic coil 23 is wrapped around the double-layer heat insulation layer 9, the number of turns of the electromagnetic coil 23, that is, the length of the high-voltage high-frequency electromagnetic wire is determined according to the power size and actual demand, the output power is 80-150 KW, and in the embodiment, 150 KW is taken, a magnetic field is generated by the current passing through the spiral electromagnetic coil 23, an eddy current is induced in the kiln cylinder 1 by electromagnetic induction, and then the kiln cylinder 1 is heated, and the two ends of the electromagnetic coil 23 are respectively connected to two power supply slip rings 25, as shown in Figure 7 Two electromagnetic coils 23 are provided in one heating module, the two electromagnetic coils are completely the same, the colors provided in the figure are only for the purpose of easy observation and have no special meaning, the two electromagnetic coils 23 are synchronously and uniformly wound, the head portions of the two electromagnetic coils 23 are connected to the same power supply slip ring, and the tail portions of the two electromagnetic coils 23 are connected to another power supply slip ring; four power supply slip rings 25 are arranged in sequence in one heating module, and the four power supply slip rings are a first power supply slip ring 2501, a second power supply slip ring 2502, a third power supply slip ring 2503 and a fourth power supply slip ring 2504 in sequence, the two ends of the electromagnetic coil 23 are respectively connected to the first power supply slip ring 2501 and the third power supply slip ring 2503, or the two ends of the electromagnetic coil 23 are respectively connected to the second power supply slip ring 2502 and the fourth power supply slip ring 2504; all the power supply slip rings 25 are fixed around the heating section 102 of the kiln cylinder 1 through a connecting plate 26, the connecting plate 26 is fixed on the kiln cylinder 1, specifically, the connecting plate 26 is welded on the kiln cylinder 1, one power supply slip ring 25 is clamped between the two connecting plates 26, and the power supply slip ring 25 and the connecting plate 26 are fixed by bolts;

[0031] As Figure 6As shown: two power supply slip rings 25 are provided with power supply carbon brush units, the power supply carbon brush unit includes two power supply carbon brushes 27, the power supply carbon brushes 27 abut against the outer circle of the two power supply slip rings 25 connected with the electromagnetic coil 23, that is, the power supply carbon brushes 27 abut against the first power supply slip ring 2501 and the third power supply slip ring 2503, or the power supply carbon brushes 27 abut against the second power supply slip ring 2502 and the fourth power supply slip ring 2504, the two power supply carbon brushes 27 are slidably installed on the rack 35 through the same carbon brush group frame 36, and the two power supply carbon brushes 27 in pairs are connected with the control system 13 of the electromagnetic frequency conversion control cabinet; as Figure 4 As shown: in each heating module, power supply carbon brush units connected to the same control system 13 are symmetrically arranged on both sides of the power supply slip ring 25, and the two power supply carbon brushes 27 in the two power supply carbon brush units corresponding to the same power supply slip ring are connected through power supply lines;

[0032] The temperature control module includes a temperature sensor 22, which is inserted into the double-layer heat insulation layer 9 to monitor the real-time temperature, and is closely attached to the kiln cylinder 1, as Figure 5As shown: two ends of the temperature sensor 22 are connected with two signal slip rings 24 respectively, that is, four signal slip rings 24 are arranged in sequence in one temperature control module, which are first signal slip ring 2401, second signal slip ring 2402, third signal slip ring 2403 and fourth signal slip ring 2404 in sequence, two ends of the temperature sensor 22 are connected with the first signal slip ring 2401 and the third signal slip ring 2403 respectively, or two ends of the temperature sensor 22 are connected with the second signal slip ring 2402 and the fourth signal slip ring 2404 respectively; the signal slip ring 24 is fixed around the heating section 102 of the kiln cylinder 1 through the connecting plate 26, and the connecting plate 26 is fixed on the kiln cylinder 1; a signal carbon brush unit is arranged outside the two signal slip rings 24, and the signal carbon brush unit includes two temperature measuring carbon brushes 28, which abut against the outer circle of the two signal slip rings 24 connected with the temperature sensor 22, that is, the temperature sensor 22 is connected with the first signal slip ring 2401 and the third signal slip ring 2403, and the temperature measuring carbon brush 28 abuts against the first signal slip ring 2401 and the third signal slip ring 2403, or the temperature measuring carbon brush 28 abuts against the second signal slip ring 2402 and the fourth signal slip ring 2404; the two temperature measuring carbon brushes 28 are installed on the rack 35 through the same carbon brush group frame 36, and the two temperature measuring carbon brushes 28 are connected with the control system 13 of the electromagnetic frequency conversion control cabinet; the carbon brush group frame 36 includes a U-shaped frame 33, long circular holes are opened on the two side plates of the U-shaped frame 33, a fixing rod 34 is installed between the two long circular holes, the long circular holes can adjust the distance between the fixing rod 34 and the kiln cylinder 1, and then adjust the distance between the carbon brush and the slip ring, so as to ensure stable contact, two carbon brush fixing clamps are installed on each fixing rod 34, the power carbon brush 27 and the temperature measuring carbon brush 28 are installed on the fixing rod 34 through the carbon brush fixing clamps respectively, two power carbon brushes 27 abutting against the same power slip ring 25 are installed on each carbon brush fixing clamp, and the two power carbon brushes 27 are arranged symmetrically up and down, and the two temperature measuring carbon brushes 28 abutting against the same signal slip ring 24 are installed on each carbon brush fixing clamp, and the two temperature measuring carbon brushes 28 are arranged symmetrically up and down; the sliding block 32 is fixed on the top plate outside the U-shaped frame 33, and the sliding block 32 is slidably installed on the rack 35 through the sliding groove 31;

[0033] As Figure 2As shown: the length of the cooling section 103 of the kiln shell 1 is 13.5 m, which is made of carbon steel material; the front section of the cooling section 103 is sleeved with a heat insulation layer 8, which is made of two layers of aluminum silicate insulation felt with a thickness of 40 mm, and the rear section of the cooling section 103 is annularly provided with a water jacket 14, which is welded on the kiln shell 1, has a length of 8 m, is made of boiler steel plate, contains cooling water, and is used for cooling the calcined lime to accelerate the cooling speed; the water jacket 14 rotates synchronously with the kiln shell 1, and the water jacket 14 is provided at the end shaft axis with a water inlet pipe 20 through a rotary joint 18, which does not rotate; the outer circle static part of the rotary joint 18 is provided with a branch steam pipe 21, which does not rotate; the heat generated in the cooling process heats and warms the cooling water to a gaseous state, which is converted into water vapor and discharged through the steam pipe 21; as shown in Figure 2 、 3 As shown: four fan-shaped discharge ports 30 are uniformly opened on the tail end surface of the cooling section 103, and the tail part of the water jacket 14 is provided with a discharge channel 29; a hoist 16 is arranged behind the cooling section 103, the lower inlet of the hoist 16 is connected with the discharge end of the discharge pipe 15, the inlet end of the discharge pipe 15 is connected with the discharge channel 29 for discharging; the top end of the hoist 16 is connected with a product bin 17.

[0034] In use, two groups of electromagnetic coils 23 are provided, namely electromagnetic coil I 2301 and electromagnetic coil II 2302, which are side by side and wound on the kiln cylinder 1. The two ends of the electromagnetic coil I 2301 are connected to the first power slip ring 2501 and the third power slip ring 2503, respectively, and the two ends of the electromagnetic coil II 2302 are connected to the first power slip ring 2501 and the third power slip ring 2503, respectively. The head and tail of the electromagnetic coil I 2301 and the electromagnetic coil II 2302 are different in the fixed position on the same power slip ring 25. The two ends of the temperature sensor 22 are connected to the first signal slip ring 2401 and the third signal slip ring 2403, respectively. The electromagnetic coil 23 rotates with the kiln cylinder 1 and passes below the slip ring without affecting rotation. The position of the carbon brush fixing clamp on the fixed rod 34 is adjusted, and the slip ring is clamped between the connecting plates 26, so that the four power carbon brushes 27 fixed on the same fixed rod 34 are respectively abutted against the first power slip ring 2501 and the third power slip ring 2503, and the four temperature measuring carbon brushes 28 are respectively abutted against the first signal slip ring 2401 and the third signal slip ring 2403. That is, two power carbon brushes 27 are fixed on the same carbon brush fixing clamp one above the other and abutted against the same power slip ring 25, and two temperature measuring carbon brushes 28 are fixed on the same carbon brush fixing clamp one above the other and abutted against the same signal slip ring 24. The same arrangement of four power carbon brushes 27 is adopted on the other side of the rack 35, which is connected to the same set of power slip rings 25 in the same way, and the power carbon brushes 27 abutted against the same power slip ring 25 are connected by power lines. At this time, the second power slip ring 2502 and the fourth power slip ring 2504 and the second signal slip ring 2402 and the fourth signal slip ring 2404 are used as backup, and the four power slip rings 25 and the four signal slip rings 24 are used one as backup and the other for exchange. The driving motor 11 is turned on, which drives the open gear ring 10 through the speed reducer 12, and the open gear ring 10 drives the kiln cylinder 1 to rotate. The control system 13 is turned on, and the power carbon brushes 27 and the power slip rings 25 are matched to connect the electromagnetic coils 23 with current. The magnetic field is generated by the current through the spiral electromagnetic coils 23, and eddy current is induced in the kiln cylinder 1 by electromagnetic induction, thereby heating the kiln cylinder 1. After the material is weighed by the belt scale 6 and enters the preheating section 101 of the kiln cylinder 1 through the feeding pipe 7, it is preheated and enters the heating section 102. In the process of rotation, it is continuously heated and calcined by the cylinder wall, and after calcination, it enters the cooling section 103, where it is cooled by the water jacket 14. The cooling water enters the water jacket 14 through the water inlet pipe 20 and the rotary joint 18, and is heated and vaporized in the water jacket 14. The pressure increases and the water vapor is converted and discharged from the steam pipe 21, realizing energy recovery.The cooled material enters the discharge channel 29 on the water jacket 14 through the discharge port 30 of the cooling section 103, and is then discharged from the kiln body 1 into the discharge pipe 15. Finally, it enters the product bin 17 through the discharge pipe 15 via the elevator 16, completing the production process. During production, due to the high calcination temperature, the kiln body 1 expands due to heat. This expansion causes the slip ring fixed on the kiln body 1 to move horizontally. At this time, the power carbon brush 27 fixed on the U-shaped frame 33 moves with the power slip ring 25, and the slider 32 on the top plate of the U-shaped frame 33 slides on the slide groove 31 to ensure good contact between the carbon brush and the slip ring. Similarly, the temperature measuring carbon brush 28 slides with the movement of the signal slip ring 24. When the drive motor 11 is turned off, the kiln body 1 stops rotating, the control system 13 is turned off, the electromagnetic coil 23 is de-energized, and the operation stops.

[0035] Example 2

[0036] An electromagnetic rotary kiln for calcining limestone, such as Figure 1 As shown: The kiln body 1 is installed on the ground by multiple sets of support rollers 4. The kiln body is high at the head and low at the tail, with an inclination of 2.5°~3.5°, preferably 3°. The rotation speed is 2 revolutions / min. A feed pipe 7 is provided in the center of the head of the kiln body 1. The inlet of the feed pipe 7 is connected to the outlet of the belt scale 6. A raw material bin 5 is provided above the belt scale 6. The kiln body 1 is divided into a preheating section 101, a heating section 102, and a cooling section 103 from head to tail.

[0037] The preheating section 101 of the kiln body 1 is tightly wrapped with a heat insulation layer 8, and the preheating section 101 is equipped with a frequency conversion drive system.

[0038] The heating section 102 of the kiln body 1 is tightly wrapped with a double-layer heat insulation layer 9. Two heating modules are arranged at intervals outside the double-layer heat insulation layer 9, and two temperature control modules are provided in conjunction with them.

[0039] The heating module includes an electromagnetic coil 23, which is formed by winding high-voltage, high-frequency electromagnetic wire. The high-voltage, high-frequency electromagnetic wire is composed of multiple strands of aluminum wire, using 80 square millimeter soft aluminum wire. The electromagnetic coil 23 is wrapped around the double-layer heat insulation layer 9. The number of turns of the electromagnetic coil 23 is determined according to the power and actual requirements. A magnetic field is generated by current passing through the spiral electromagnetic coil 23, inducing eddy currents in the kiln shell 1 through electromagnetic induction, thereby heating the kiln shell 1. Two power slip rings 25 are connected to each end of the electromagnetic coil 23. One power slip ring is connected to the head of the electromagnetic coil 23, and the other power slip ring is connected to the tail of the electromagnetic coil 23. All power slip rings 25 are fixed to the heating section 102 of the kiln shell 1 by connecting plates 26. The connecting plates 26 are fixed to the kiln shell 1, and one power slip ring 25 is sandwiched between every two connecting plates 26. Figure 4As shown: two power supply slip rings 25 are provided with power carbon brush units, the power carbon brush units include two power carbon brushes 27, the power carbon brushes 27 abut against the outer rings of the two power supply slip rings 25 connected with the electromagnetic coils 23, the two power carbon brushes 27 are slidably installed on the rack 35 through the same carbon brush group frame 36, and the two power carbon brushes 27 are connected with the control system 13 of the electromagnetic frequency conversion control cabinet; in each heating module, power carbon brush units connected with the same control system 13 are symmetrically arranged on both sides of the power supply slip rings 25, and the two power carbon brushes 27 in the two power carbon brush units corresponding to the same power supply slip ring are connected through power supply lines;

[0040] The temperature control module includes a temperature sensor 22, the temperature sensor 22 is inserted into the double-layer heat insulation layer 9 to monitor the real-time temperature, and is closely attached to the kiln cylinder 1, two ends of the temperature sensor 22 are respectively connected with two signal slip rings 24, the signal slip rings 24 are fixed around the heating section 102 of the kiln cylinder 1 through a connecting plate 26, and the connecting plate 26 is fixed on the kiln cylinder 1; a signal carbon brush unit is arranged outside the two signal slip rings 24, the signal carbon brush unit includes two temperature measuring carbon brushes 28, the temperature measuring carbon brushes 28 abut against the outer rings of the two signal slip rings 24 connected with the temperature sensor 22, the two temperature measuring carbon brushes 28 are installed on the rack 35 through the same carbon brush group frame 36, and the two temperature measuring carbon brushes 28 are connected with the control system 13 of the electromagnetic frequency conversion control cabinet; the carbon brush group frame 36 includes a U-shaped frame 33, long circular holes are correspondingly formed on the two side plates of the U-shaped frame 33, a fixing rod 34 is installed between the two long circular holes, the long circular holes can adjust the distance between the fixing rod 34 and the kiln cylinder 1, thereby adjusting the distance between the carbon brush and the slip ring, and ensuring stable contact, two carbon brush fixing clamps are installed on each fixing rod 34, the power carbon brushes 27 and the temperature measuring carbon brushes 28 are respectively installed on the fixing rod 34 through the carbon brush fixing clamps, two power carbon brushes 27 abutting against the same power supply slip ring 25 are installed on each carbon brush fixing clamp, the two power carbon brushes 27 are symmetrically arranged upward and downward, and two temperature measuring carbon brushes 28 abutting against the same signal slip ring 24 are installed on each carbon brush fixing clamp, the two temperature measuring carbon brushes 28 are symmetrically arranged upward and downward; a sliding block 32 is fixed on the outer side of the top plate of the U-shaped frame 33, and the sliding block 32 is slidably installed on the rack 35 through a sliding groove 31;

[0041] As shown in Figure 2 The cooling section 103 of the kiln cylinder 1 is sleeved with the heat insulation layer 8, a water jacket 14 is arranged around the rear section of the cooling section 103, and cooling water is filled in the water jacket 14; the water jacket 14 rotates synchronously with the kiln cylinder 1, an inlet pipe 20 is installed at the end axis of the water jacket 14 through a rotary joint 18, a branch steam pipe 21 is arranged on the outer ring of the stationary part of the rotary joint 18, heat generated in the cooling process heats and warms the cooling water to a gaseous state, and the water vapor is converted and discharged through the steam pipe 21; as shown in Figure 2 , 3As shown: the tail end surface of the cooling section 103 is uniformly provided with four fan-shaped discharge ports 30, and the tail part of the water jacket 14 is provided with a discharge channel 29. A hoist 16 is arranged behind the cooling section 103, the lower inlet of the hoist 16 is connected with the discharge end of a discharge pipe 15, the inlet end of the discharge pipe 15 is connected with the discharge channel 29 for discharging, and the top end of the hoist 16 is connected with a product bin 17.

[0042] In use, the electromagnetic coil 23 is wound on the kiln cylinder 1, the head and tail of the electromagnetic coil 23 are connected to two power supply slip rings 25 respectively; the two ends of the temperature sensor 22 are connected to different signal slip rings 24; the electromagnetic coil 23 rotates with the kiln cylinder 1, the electromagnetic coil 23 passes below the slip ring, without affecting the rotation; the position of the carbon brush fixing clamp on the fixed rod 34 is adjusted, the slip ring is clamped between the connecting plates 26, so that the four power supply carbon brushes 27 fixed on the same fixed rod 34 are respectively abutted on the two power supply slip rings 25, and the four temperature measuring carbon brushes 28 are respectively abutted on the two signal slip rings 24, that is, the two power supply carbon brushes 27 are fixed on the same carbon brush fixing clamp one above the other, and are abutted on the same power supply slip ring 25, and the two temperature measuring carbon brushes 28 are fixed on the same carbon brush fixing clamp one above the other, and are abutted on the same signal slip ring 24; the same arrangement of four power supply carbon brushes 27 on the other side of the rack 35 is connected to the same set of power supply slip rings 25 in the same way, and the power supply carbon brushes 27 abutted on the same power supply slip ring 25 are connected by power supply lines; the driving motor 11 is turned on, the driving motor 11 drives the open gear ring 10 through the speed reducer 12, the open gear ring 10 drives the kiln cylinder 1 to rotate; the control system 13 is turned on, the current is input to the electromagnetic coil 23 through the cooperation of the power supply carbon brush 27 and the power supply slip ring 25, the magnetic field is generated by the current passing through the spiral electromagnetic coil 23, the eddy current is induced in the kiln cylinder 1 by electromagnetic induction, and the kiln cylinder 1 is heated; after the material is weighed by the belt scale 6 and then enters the preheating section 101 of the kiln cylinder 1 through the feeding pipe 7, it enters the heating section 102 after preheating, is calcined by the continuous heating of the cylinder wall during rotation, and enters the cooling section 103 after calcination, is cooled by the water jacket 14 in the cooling section 103, the cooling water enters the water jacket 14 through the water inlet pipe 20 and the rotary joint 18, in the water jacket 14, the cooling water is heated and warmed to a gaseous state, at the same time, the pressure increases to become water vapor, and is discharged from the steam pipe 21, realizing energy recovery; the cooled material enters the discharge channel 29 opened on the water jacket 14 from the discharge opening 30 opened on the cooling section 103, and is discharged from the kiln cylinder 1 into the discharge pipe 15, and finally enters the product bin 17 through the elevator 16, and the production is completed; during production, due to high calcination temperature, the kiln cylinder 1 expands, the expansion causes the slip ring fixed on the kiln cylinder 1 to move horizontally, at this time, the power supply carbon brush 27 fixed on the U-shaped frame 33 moves with the power supply slip ring 25, the sliding block 32 on the top plate of the U-shaped frame 33 slides on the sliding groove 31, ensuring good contact between the carbon brush and the slip ring, and the temperature measuring carbon brush 28 slides with the movement of the signal slip ring 24; the driving motor 11 is turned off, the kiln cylinder 1 stops rotating, the control system 13 is turned off, the electromagnetic coil 23 is powered off, and the operation is stopped.

[0043] The scope of the present application is not limited to the above specific embodiments, and the application can have various modifications and alterations, and any modifications, improvements and equivalent replacements made within the concept and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An electromagnetic rotary kiln for calcining limestone, comprising a kiln body (1), the kiln body (1) being mounted on the ground via multiple sets of support rollers (4), a feed pipe (7) being provided at the center of the head of the kiln body (1), the inlet of the feed pipe (7) being connected to the outlet of a belt scale (6), and a raw material silo (5) being provided above the belt scale (6); characterized in that: The kiln body (1) is divided into a preheating section (101), a heating section (102), and a cooling section (103) from head to tail. The preheating section (101) of the kiln body (1) is tightly wrapped with a heat insulation layer (8), and the preheating section (101) is equipped with a frequency conversion drive system; The heating section (102) of the kiln body (1) is tightly wrapped with a double-layer heat insulation layer (9), and one or more heating modules are spaced apart on the double-layer heat insulation layer (9). The heating module includes an electromagnetic coil (23), which is wrapped around a double-layer heat insulation layer (9). The two ends of the electromagnetic coil (23) are connected to two power slip rings (25). The power slip rings (25) are fixed around the heating section (102) of the kiln body (1) by a connecting plate (26). The connecting plate (26) is fixed on the kiln body (1). A power carbon brush unit is set outside the two power slip rings (25). The power carbon brush unit includes two power carbon brushes (27). The power carbon brushes (27) abut against the outer ring of the power slip rings (25). The two power carbon brushes (27) are slidably installed on the frame (35) through the same carbon brush bracket (36). The two power carbon brushes (27) are connected to the control system (13) of the electromagnetic frequency converter control cabinet. The front section of the cooling section (103) of the kiln body (1) is covered with a heat insulation layer (8), and the rear section of the cooling section (103) is surrounded by a water jacket (14). The water jacket (14) rotates synchronously with the kiln body (1). A water inlet pipe (20) is installed at the end axis of the water jacket (14) through a rotary joint (18). The outer ring of the rotary joint (18) is provided with a branch connecting to a steam pipe (21). A discharge port (30) is opened at the tail end of the cooling section (103), and a discharge channel (29) is provided at the corresponding position at the tail of the water jacket. An elevator (16) is provided behind the cooling section (103). The lower inlet of the elevator (16) is connected to the discharge end of the discharge pipe (15), and the inlet of the discharge pipe (15) is connected to the discharge channel (29) for discharge. A product bin (17) is connected to the top of the elevator (16). The double-layer heat insulation layer (9) is equipped with the same number of temperature control modules as the heating module. The temperature control module includes a temperature sensor (22), which is inserted into the double-layer heat insulation layer (9). The two ends of the temperature sensor (22) are respectively connected to two signal slip rings (24). The signal slip rings (24) are fixed around the heating section (102) of the kiln body (1) by a connecting plate (26). The connecting plate (26) is fixed on the kiln body (1). A signal carbon brush unit is set outside the two signal slip rings (24). The signal carbon brush unit includes two temperature measuring carbon brushes (28). The temperature measuring carbon brushes (28) abut against the outer ring of the signal slip rings (24). The two temperature measuring carbon brushes (28) are installed on the frame through the same carbon brush frame (36). The pair of temperature measuring carbon brushes (28) are connected to the control system (13) of the electromagnetic frequency conversion control cabinet. The carbon brush holder (36) includes a U-shaped frame (33), with corresponding elongated holes on the two side plates of the U-shaped frame (33), and a fixing rod (34) installed between the two elongated holes; the power carbon brush (27) or the temperature measuring carbon brush (28) is installed on its respective fixing rod (34) by carbon brush fixing clips; a slider (32) is fixed on the outer side of the top plate of the U-shaped frame (33), and the slider (32) is slidably installed on the frame (35) through a sliding groove (31).

2. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: In the power carbon brush unit, each fixing rod (34) is equipped with two carbon brush fixing clips, and each carbon brush fixing clip is equipped with two power carbon brushes (27) that abut against the same power slip ring (25). The two power carbon brushes (27) are arranged symmetrically up and down. Similarly, in the signal carbon brush unit, each fixing rod (34) is equipped with two carbon brush fixing clips, and each carbon brush fixing clip is equipped with two temperature measuring carbon brushes (28) that abut against the same signal slip ring (24). The two temperature measuring carbon brushes (28) are arranged symmetrically up and down.

3. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: In each heating module, power brush units connected to the same transformer control system (13) are symmetrically arranged on both sides of the power slip ring (25). The two power brushes (27) of the two power brush units corresponding to the same power slip ring are connected by a power line.

4. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: A heating module is provided with two electromagnetic coils (23), which are wound synchronously in the same direction. The heads of the two electromagnetic coils (23) are connected to the same power slip ring (25), and the tails of the two electromagnetic coils (23) are connected to another power slip ring (25).

5. The electromagnetic rotary kiln for calcining limestone according to claim 4, characterized in that: Four power slip rings (25) are arranged sequentially in a heating module, namely, a first power slip ring (2501), a second power slip ring (2502), a third power slip ring (2503), and a fourth power slip ring (2504). The two ends of the electromagnetic coil (23) are respectively connected to the first power slip ring (2501) and the third power slip ring (2503), or the two ends of the electromagnetic coil (23) are respectively connected to the second power slip ring (2502) and the fourth power slip ring (2504); similarly, Four signal slip rings (24) are arranged in sequence in a temperature control module, namely the first signal slip ring (2401), the second signal slip ring (2402), the third signal slip ring (2403) and the fourth signal slip ring (2404). The two ends of the temperature sensor (22) are respectively connected to the first signal slip ring (2401) and the third signal slip ring (2403), or the two ends of the temperature sensor (22) are respectively connected to the second signal slip ring (2402) and the fourth signal slip ring (2404).

6. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: The cooling section (103) of the kiln body (1) has four fan-shaped discharge ports (30) evenly distributed on its tail end face.

7. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: The kiln shell (1) has a diameter of 2m and a length of 58m; the preheating section (101) of the kiln shell (1) has a length of 14.5m and is made of carbon steel; the heating section (102) of the kiln shell (1) has a length of 30m and is made of 310S stainless steel; the cooling section (103) of the kiln shell (1) has a length of 13.5m and is made of carbon steel; the water jacket (14) has a length of 8m and is made of boiler steel plate.

8. The electromagnetic rotary kiln for calcining limestone according to claim 1, characterized in that: The heat insulation layer (8) is made of two layers of aluminum silicate insulation felt, and the double-layer heat insulation layer (9) is made of two layers of zirconium-containing aluminum silicate insulation felt and two layers of aluminum silicate insulation felt, with a thickness of 80mm.

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