Rotary kiln

Abstract

The utility model relates to a rotary kiln which comprises a preheating section rotary drum, a fixed section and a reaction section rotary drum which are sequentially connected from high to low, and a hot air supply device and a natural gas supply device are respectively arranged on the fixed section. A feeding device is arranged at one end, deviating from the fixed section, of the preheating section rotary drum; a kiln tail slag discharging box and a heat source natural gas ignition device are arranged at the end, away from the fixed section, of the reaction section rotary drum. The novel three-section rotary kiln has the advantages that roasting of different materials and metal recovery can be achieved, the production bottleneck restricting company productivity improvement is solved, meanwhile, natural gas is used for replacing coke powder or anthracite, the productivity of the rotary kiln can be greatly improved, energy consumption is reduced, and the metal recovery rate is improved. Meanwhile, due to the improvement of the metal recovery rate, the improvement of the treatment capacity and the reduction of energy consumption, the production cost is remarkably reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of metal recycling technology, and in particular to a rotary kiln. Background Technology

[0002] Hydrometallurgical zinc refining is a major modern zinc smelting method, accounting for over 85% of the world's total zinc production. In this process, zinc concentrate undergoes roasting, leaching, leachate purification, and electrowinning to ultimately obtain metallic zinc or zinc compounds. However, the leaching residue produced during acid leaching contains high levels of valuable metals such as zinc and lead. Failure to recover and utilize this residue not only wastes resources but also pollutes the environment. Therefore, the effective treatment and resource utilization of leaching residue is of paramount importance.

[0003] Currently, most enterprises use rotary kilns to roast leaching residue for the recovery of valuable metals. During roasting, the materials (leaching residue and added coke powder) move from the kiln tail to the kiln head under the rotation and tilting action of the kiln body, and the materials begin to undergo oxidation reactions as they move. The existing traditional self-heating rotary kilns in the industry are single-stage, with the entire kiln shell divided into a preheating section and a reaction section during operation. Due to the influence of the kiln rotation speed, the effective inner diameter of the kiln, and the feed rate, the flue gas heat in the preheating section and the reaction section mutually restricts and interferes with each other, resulting in poor heat utilization, incomplete combustion of the added coke powder, low equipment output, and high energy consumption. With the company's capacity expansion, traditional rotary kilns can no longer meet the company's production technology needs. How to optimize the volatilization process of the rotary kiln, improve the recovery rate of valuable metals such as zinc and lead, and how to adapt to the roasting of various materials, reduce energy consumption, and improve resource utilization efficiency are all key research areas. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a rotary kiln that is suitable for the oxidative roasting of zinc ore, the roasting of intermediate materials in zinc wet smelting (copper slag, cobalt slag, lead slag, acid leaching slag), and the roasting of lithium metal, and can also be used for cement roasting.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A rotary kiln, comprising: a preheating section rotary drum, a fixed section and a reaction section rotary drum connected in sequence from high to low, wherein a hot air supply device and a natural gas supply device are respectively provided on the fixed section;

[0006] A feeding device is provided at the end of the preheating section drum opposite to the fixed section;

[0007] The end of the reaction section rotary drum opposite to the fixed section is equipped with a kiln tail slag discharge box and a natural gas ignition device.

[0008] The beneficial effects of this invention are as follows: The novel three-stage rotary kiln can achieve roasting and metal recovery of different materials, which not only solves the production bottleneck restricting the company's capacity expansion, but also significantly increases the rotary kiln's capacity, reduces energy consumption, and improves the metal recovery rate by using natural gas instead of coke powder or anthracite. Furthermore, the increased metal recovery rate, improved processing capacity, and reduced energy consumption significantly reduce production costs and improve energy efficiency.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the preheating section drum is driven to rotate by a preheating section driving device, and the reaction section drum is driven to rotate by a reaction section driving device.

[0011] The preheating section drive device and the reaction section drive device have the same structure.

[0012] The beneficial effects of adopting the above-mentioned further solutions are: the preheating section drive device and the reaction section drive device adopt the same structural design, which not only simplifies the complexity of the overall equipment, but also facilitates the standardized production and maintenance of the equipment; by driving the preheating section drum and the reaction section drum through the transmission system, efficient and stable driving of the preheating section drum and the reaction section drum is achieved, which is conducive to improving production efficiency and product quality.

[0013] Furthermore, multiple preheating section support devices are spaced apart along the axial direction of the preheating section drum, and multiple reaction section support devices are spaced apart along the axial direction of the reaction section drum.

[0014] The fixed section is supported by the fixed section support foundation;

[0015] The preheating section drum, the fixed section, and the reaction section drum are arranged at the same tilt angle.

[0016] The beneficial effects of adopting the above-mentioned further solutions are: the tilt angle helps the material to be evenly distributed and flowed within the preheating section and the reaction section. Multiple axially spaced support devices provide stable support for the preheating section and the reaction section, facilitating their stable rotation and enhancing the overall structural stability of the equipment.

[0017] Furthermore, the preheating section support device and the reaction section support device have the same structure. The preheating section support device includes: a support base and a pair of rollers. The pair of rollers are spaced apart on the support base. The axis of the rollers is parallel to the axis of the preheating section drum. The pair of rollers are used to support the preheating section drum from both sides below and rotate together with the preheating section drum.

[0018] The beneficial effects of adopting the above-mentioned further solution are: the preheating section support device and the reaction section support device provide stable support for the preheating section drum and the reaction section drum through the support base and a pair of parallel and spaced rollers, ensuring that the preheating section drum can rotate smoothly and reducing vibration and noise caused by unstable support.

[0019] Furthermore, a pair of thrust rollers are also provided on the preheating section support device or the reaction section support device near the fixed section. The pair of thrust rollers are spaced apart between the pair of support rollers along the axial direction of the preheating section drum or the reaction section drum, and the pair of thrust rollers are collinear.

[0020] The preheating section drum and the reaction section drum are respectively provided with annular convex rings on their outer circumferences, and a pair of the baffle wheels are respectively provided on both sides of the annular convex rings, with the axis of the baffle wheels being perpendicular to the axis of the support roller.

[0021] The beneficial effects of adopting the above-mentioned further solution are: the cooperation between the thrust roller and the annular convex ring ensures that the rotating drum always runs along the predetermined trajectory during rotation. The setting of the thrust roller further restricts the axial movement of the preheating section rotating drum or the reaction section rotating drum during operation, preventing vibration and instability caused by axial movement, which helps to maintain the stable operation of the equipment and improve production efficiency and product quality.

[0022] Furthermore, the stop wheel is a hydraulic stop wheel.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: the hydraulic thrust roller system can achieve precise control of heavy equipment such as the kiln body through the precise supply and release of hydraulic oil, making the thrust roller more stable during operation, thereby improving the overall operational stability and production efficiency of the equipment.

[0024] Furthermore, the working inner diameters of the preheating section drum, the fixed section, and the reaction section drum are all the same, and the structure of the preheating section drum is the same as that of the reaction section drum. The preheating section drum includes: a preheating section drum body and a preheating section castable layer disposed inside the preheating section drum body.

[0025] The beneficial effects of adopting the above-mentioned further solutions are: the preheating section drum and the reaction section drum adopt the same structure, which helps to achieve equipment standardization and interchangeability, and has higher compatibility; the same structure also simplifies the design and manufacturing process, reduces production costs, reduces the use of molds and tooling, improves production efficiency, and is also easy to install and maintain.

[0026] Furthermore, the fixed section includes: a fixed section cylinder and a fixed section castable layer disposed inside the fixed section cylinder;

[0027] Sealing devices are provided at both ends of the connection between the fixed section cylinder and the preheating section cylinder and the reaction section cylinder. The sealing devices include: fish scales, steel wire rope and counterweight. Multiple fish scales are arranged in a ring around the connection between the fixed section cylinder and the preheating section cylinder or the fixed section cylinder and the reaction section cylinder.

[0028] The steel wire rope is arranged around one end of the fish scale near the fixed section cylinder, and the other end of the fish scale away from the fixed section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder.

[0029] The two ends of the wire rope are respectively connected to the counterweights.

[0030] The beneficial effects of adopting the above-mentioned further solution are: by setting fish scale-type sealing devices at the connection between the fixed section cylinder, the preheating section cylinder, and the reaction section cylinder, these fish scales can be arranged tightly in a ring around the circumference. With the steel wire rope and counterweights connected to both ends of the steel wire rope, the sealing performance is good, ensuring the stability and efficiency of the process.

[0031] Furthermore, the steel wire rope is connected to the fish scale through a connector. The connector is arranged parallel to the fish scale. One end of the connector and the end of the fish scale away from the fixed section are fixed together on the preheating section cylinder or the reaction section cylinder. The other end of the connector is hook-shaped to hook the steel wire rope.

[0032] A pulley is installed at the connection between the fixed section and the preheating section cylinder or at the connection between the fixed section and the reaction section cylinder via a bracket, and the steel wire rope passes through the tail end of the pulley and is connected to the counterweight.

[0033] The beneficial effects of adopting the above-mentioned further solution are as follows: by setting the connector parallel to the fish scales and fixing them together to the preheating section cylinder or reaction section cylinder, a tight connection between the two is ensured, making it less prone to loosening or falling off, thereby improving the overall structural strength; the other end of the connector is designed in a hook shape, making the connection and disassembly of the wire rope more convenient. The pulley arrangement makes the wire rope move more smoothly during movement, allowing the counterweight to remain balanced during movement, thus ensuring the stable operation of the entire system.

[0034] Furthermore, it also includes: a kiln shell spray cooling device, which is located above the rotating drum of the reaction section. The kiln shell spray cooling device includes: a spray pipe, a water pump, a water pump, and a water collection device. The spray pipe is located above the rotating drum of the reaction section along the length direction of the rotating drum of the reaction section. The spray pipe has multiple spray nozzles for spraying cooling water onto the outer periphery of the rotating drum of the reaction section.

[0035] The water collection device is provided below the rotating drum of the reaction section, and the water collection device is used to collect the cooling water flowing down along the outer circumference of the rotating drum of the reaction section;

[0036] The water collection device is connected to the spray pipe via the water pump and the water pumping pipe.

[0037] The beneficial effects of adopting the above-mentioned further scheme are as follows: the spray pipe is set along the length of the reaction section drum and along the central axis, ensuring that the spray water can be sprayed evenly and directly onto the outer peripheral wall of the reaction section drum. The multiple evenly distributed spray nozzles further enhance the uniformity and coverage area of ​​the spray, achieving more comprehensive and efficient cooling of the reaction section drum. By setting up a water collection device to collect the spray water flowing down along the outer periphery of the reaction section drum, and then using a water pump and water pipe to transport it back to the spray pipe for re-spraying, the cooling water is recycled, and the operating cost in the cooling process is reduced, which is in line with the current green and environmentally friendly production concept. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0039] Figure 2 This is a schematic diagram of the structure of a preheating section support device without a stop wheel in one embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the preheating section support device with a stop wheel in one embodiment of the present invention.

[0041] The attached diagram lists the components represented by each number as follows:

[0042] 1. Preheating section rotary drum; 2. Fixed section; 3. Reaction section rotary drum; 4. Preheating section drive device; 5. Reaction section drive device; 6. Preheating section support device; 7. Reaction section support device; 8. Feeding device; 9. Heat source natural gas ignition device; 10. Hot air delivery device; 11. Natural gas delivery device; 61. Support base; 62. Support roller; 63. Thrust roller. Detailed Implementation

[0043] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0044] like Figure 1As shown, this utility model provides a rotary kiln, comprising: a preheating section rotary cylinder 1, a fixed section 2, and a reaction section rotary cylinder 3 connected sequentially from high to low. The preheating section rotary cylinder 1, the fixed section 2, and the reaction section rotary cylinder 3 are sequentially connected to form an inclined three-section rotary kiln. The preheating section rotary cylinder 1 and the reaction section rotary cylinder 3 are rotatably mounted at both ends of the fixed section 2. A feeding device 8 is connected to the kiln tail end of the preheating section rotary cylinder 1 away from the fixed section 2. Specifically, the feeding device 8 can be a disc feeder, which is connected to the inside of the preheating section rotary cylinder 1 through a discharge pipe. A kiln tail slag discharge box and a natural gas ignition device 9 are connected to the kiln head end of the reaction section rotary cylinder 3 away from the fixed section 2. To optimize the volatilization process of the rotary kiln, increase the kiln's production capacity, and improve the metal recovery rate, a hot air supply device 10 and a natural gas supply device 11 are respectively installed on the fixed section 2.

[0045] This rotary kiln is used to process materials including, but not limited to, intermediate leaching residues from zinc smelting, copper slag, lead slag, cobalt slag, zinc oxide and zinc oxide ore, and lithium ore. These materials enter the first-stage rotary kiln, i.e., the preheating section (rotary cylinder 1), for pre-roasting. Natural gas and air or oxygen are introduced into the fixed section (2) to further heat the materials. The materials are then sent to the second-stage rotary kiln, i.e., the reaction section (rotary cylinder 3), for secondary roasting, thus enriching and recovering valuable elements. The introduction of hot air and natural gas into the fixed section (2) allows for rapid drying and decomposition of the materials in the preheating section. This facilitates full contact between the roasted materials and the oxygen-containing flue gas, ensuring a complete oxidation reaction and allowing for more thorough enrichment and recovery of valuable elements. Combined with oxygen concentration and temperature detection methods, the kiln temperature and reaction atmosphere can be flexibly adjusted for precise control. This not only significantly reduces energy consumption, increases production capacity, and saves costs, but also improves metal recovery rates. On-site verification showed that the improved rotary kiln can increase the recovery rate of the above metal elements by more than 15% and the processing capacity by more than 10% compared with the ordinary rotary kiln, while reducing energy consumption by 20% and saving more than 10 million yuan in costs annually.

[0046] In this embodiment, the novel three-stage rotary kiln can achieve roasting and metal recovery of different materials, which not only solves the production bottleneck restricting the company's capacity expansion, but also significantly increases the rotary kiln's capacity, reduces energy consumption, and improves the metal recovery rate by using natural gas instead of coke powder or anthracite. Furthermore, the increased metal recovery rate, improved processing capacity, and reduced energy consumption significantly reduce production costs and improve energy efficiency.

[0047] In this embodiment, the preheating section drum 1 is driven to rotate by the preheating section drive device 4, and the reaction section drum 3 is driven to rotate by the reaction section drive device 5. The preheating section drive device 4 and the reaction section drive device 5 have identical structures, and drive the preheating section drum 1 and the reaction section drum 3 to rotate in the same direction. Specifically, the preheating section drive device 4 and the reaction section drive device 5 each consist of a transmission system. The transmission system includes a main transmission system and an auxiliary transmission system. The main transmission system consists of a main motor, coupling, main reducer, pinion, etc. The auxiliary transmission system consists of an auxiliary motor, coupling, helical clutch, auxiliary reducer, etc. Both the preheating section rotating drum 1 and the reaction section rotating drum 3 are equipped with large gear ring devices to transmit torque. The large gear ring is connected to the drum body through a tangential spring plate and meshes with a pinion gear mounted on a gear shaft. The gear shaft is connected to the output shaft of the main reducer through a coupling. The input shaft of the main reducer is connected to the main motor through a coupling, thereby driving the drum body to rotate in stages. The structures of the preheating section drive device 4 and the reaction section drive device 5 are already widely disclosed and will not be described in detail here.

[0048] The preheating section drive device 4 and the reaction section drive device 5 adopt the same structural design, which not only simplifies the complexity of the overall equipment, but also facilitates the standardized production and maintenance of the equipment. The transmission system drives the preheating section drum 1 and the reaction section drum 3, realizing efficient and stable driving of the preheating section drum 1 and the reaction section drum 3, which is conducive to improving production efficiency and product quality.

[0049] like Figure 1 As shown, multiple preheating section support devices 6 are spaced apart along the axial direction of the preheating section drum 1, and multiple reaction section support devices 7 are spaced apart along the axial direction of the reaction section drum 3. The preheating section drum 1 and the reaction section drum 3 are supported by the preheating section support devices 6 and the reaction section support devices 7, respectively. Since the fixed section 2 does not rotate during operation, it can be supported by a fixed section support foundation. In this embodiment, the preheating section drum 1, the fixed section 2, and the reaction section drum 3 are arranged at the same inclination angle.

[0050] In this embodiment, the tilt angle helps to ensure uniform distribution and flow of materials within the preheating section drum 1 and the reaction section drum 3. Multiple axially spaced support devices provide stable support for the preheating section drum 1 and the reaction section drum 3, facilitating their stable rotation and enhancing the overall structural stability of the equipment.

[0051] In this embodiment, the preheating section support device 6 and the reaction section support device 7 have the same structure. Figure 2As shown, the following description uses the preheating section support device 6 as an example. The preheating section support device 6 includes a support base 61 and a pair of rollers 62. The pair of rollers 62 are spaced apart and installed on the support base 61. The pair of rollers 62 are arranged parallel to each other, and the spacing between the pair of rollers 62 ensures that the pair of rollers 62 can support the preheating section drum 1 from the lower sides and rotate together with the preheating section drum 1. In specific configuration, the axis of the rollers 62 is parallel to the axis of the preheating section drum 1.

[0052] In this embodiment, the preheating section support device 6 and the reaction section support device 7 provide stable support for the preheating section drum 1 and the reaction section drum 3 through the support base 61 and a pair of parallel and spaced rollers 62, ensuring that the preheating section drum 1 can rotate smoothly and reducing vibration and noise caused by unstable support.

[0053] like Figure 3 As shown, in the preferred embodiment, since the fixed section 2 remains fixed and does not rotate during operation, a pair of retaining wheels 63 are also provided on the preheating section support device 6 or the reaction section support device 7 closest to the fixed section 2. The pair of retaining wheels 63 are positioned between a pair of supporting wheels 62. Specifically, the retaining wheels 63 are arranged collinearly at axial intervals along the preheating section drum 1 or the reaction section drum 3, and the axis of the retaining wheels 63 is perpendicular to the axis of the supporting wheels 62. In addition, annular convex rings are formed protruding outward on the outer periphery of the preheating section drum 1 and the outer periphery of the reaction section drum 3, respectively. The annular convex rings surround the outer periphery of the preheating section drum 1 or the reaction section drum 3. The pair of retaining wheels 63 are respectively positioned on both sides of the annular convex rings on the outer periphery of the preheating section drum 1 or the reaction section drum 3, thereby further ensuring that the annular convex rings remain between the pair of retaining wheels 63 during operation.

[0054] In this embodiment, the cooperation between the retaining wheel 63 and the annular convex ring ensures that the rotating drum always runs along a predetermined trajectory during rotation. The setting of the retaining wheel 63 further restricts the axial movement of the preheating section rotating drum 1 or the reaction section rotating drum 3 during operation, preventing vibration and instability caused by axial movement, which helps to maintain the stable operation of the equipment and improve production efficiency and product quality.

[0055] In some preferred embodiments, the thrust roller 63 can be a hydraulic thrust roller, which mainly consists of a cylinder, the thrust roller 63, the thrust roller shaft, a slide, a guide shaft, rolling bearings, and a thrust roller lubrication device. When pressurized oil from the hydraulic station of the thrust roller enters the cylinder, it pushes the piston and piston rod inside the cylinder, driving the thrust roller 63 and thus moving the associated cylinder part upward. When it moves to a certain distance, the upper limit position triggers the upper limit switch, causing the valves in the hydraulic station to reverse and the oil pump motor to stop; the oil in the cylinder slowly flows to the oil tank under the weight of the kiln, and the kiln body and the thrust roller 63 slowly move downward; when it moves to the lower limit position, it triggers the lower limit switch, the valves reverse, the oil pump motor starts, and pressurized oil slowly injects into the cylinder again, causing the thrust roller 63 to drive the kiln body upward. This process is repeated continuously, causing the kiln body to float up and down within a specified stroke. Since the existing technology is relatively complete, it will not be described in detail here.

[0056] In this embodiment, the hydraulic thrust roller system enables precise control of heavy equipment such as the kiln body through the precise supply and release of hydraulic oil, making the thrust roller 63 more stable during operation, thereby improving the overall operational stability and production efficiency of the equipment.

[0057] In this embodiment, the working inner diameters of the preheating section drum 1, the fixed section 2, and the reaction section drum 3 are all the same. The preheating section drum 1 and the reaction section drum 3 have identical structures. The preheating section drum 1 includes a preheating section cylinder body and a preheating section castable layer disposed inside the preheating section cylinder body. Similarly, the reaction section drum 3 includes a reaction section cylinder body and a reaction section castable layer disposed inside the reaction section cylinder body. The castable layer can be made of refractory material. The identical structure of the preheating section drum 1 and the reaction section drum 3 facilitates equipment standardization and interchangeability, resulting in higher compatibility. The identical structure also simplifies the design and manufacturing process, reduces production costs, decreases the use of molds and tooling, improves production efficiency, and facilitates installation and maintenance.

[0058] In this embodiment, the fixed section 2 includes a fixed section cylinder and a fixed section castable layer disposed inside the fixed section cylinder. Furthermore, sealing devices are respectively provided at both ends where the fixed section cylinder connects to the preheating section cylinder and the reaction section cylinder. The sealing devices are made of fish scales, and multiple fish scales are arranged in a tightly circumferential ring at the connection between the fixed section cylinder and the preheating section cylinder or the fixed section cylinder and the reaction section cylinder. The end of the fish scale near the preheating section cylinder or the reaction section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder. A steel wire rope is wound around the sealing device at the end of the fish scale near the fixed section cylinder. Specifically, the steel wire rope can be arranged around the sealing device via a connector. One end of the connector and the end of the fish scale away from the fixed section 2 are fixed together on the preheating section rotating drum 1 or the reaction section rotating drum 3. The other end of the connector is hook-shaped to hook the steel wire rope. It is conceivable that multiple connectors are arranged circumferentially on the sealing device to install the steel wire rope. At the same time, counterweights are connected to both ends of the steel wire rope. It is conceivable that a pulley can also be installed by setting a bracket at the connection between the fixed section 2 and the preheating section drum 1 or at the connection between the fixed section 2 and the reaction section drum 3, so that the end of the wire rope is connected to a counterweight after passing through the pulley.

[0059] In this embodiment, a fish-scale-type sealing device is installed at the connection between the fixed section cylinder, the preheating section cylinder, and the reaction section cylinder. These fish scales can be arranged tightly in a ring around the circumference. With the help of a steel wire rope and counterweights connected to both ends of the steel wire rope, the sealing performance is good, ensuring the stability and efficiency of the process.

[0060] In some feasible embodiments, a kiln shell spray cooling device is also provided above the reaction section rotary drum 3. The kiln shell spray cooling device specifically includes: a spray pipe, a water pump, and a water collection device. The spray pipe is positioned above the reaction section rotary drum 3 along its length and along its central axis, resulting in better spray cooling. Multiple spray nozzles are evenly distributed on the spray pipe, spraying cooling water onto the outer periphery of the reaction section rotary drum 3 to cool it.

[0061] In addition, a water collection device is installed below the rotating drum 3 of the reaction section. The water collection device can be a water collection tank, which collects the cooling water flowing down the outer circumference of the rotating drum 3 of the reaction section. In order to realize the recycling of cooling water, a water pump is also installed in the water collection device, and the water pump is connected to the spray pipe through a water pumping pipe. It can be imagined that during the initial operation, a water supply pipe connected to the spray pipe should also be set up to provide cooling water to the outer circumference of the rotating drum 3 of the reaction section. When the water collection device stores a sufficient amount of cooling water, the water collected in the water collection device is used to cool the rotating drum 3 of the reaction section by closing the valve at the connection between the water supply pipe and the spray pipe.

[0062] In this embodiment, the spray pipe is arranged along the length of the reaction section rotating drum 3 and along the central axis, ensuring that the spray water can be sprayed evenly and directly onto the outer peripheral wall of the reaction section rotating drum 3. The multiple evenly distributed spray nozzles further enhance the uniformity and coverage of the spray, achieving more comprehensive and efficient cooling of the reaction section rotating drum 3. By setting up a water collection device to collect the spray water flowing down along the outer periphery of the reaction section rotating drum 3, and by using a water pump and water pipe to transport it back to the spray pipe for re-spraying, the cooling water is recycled, and the operating cost in the cooling process is reduced, which is in line with the current green and environmentally friendly production concept.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary kiln, characterized in that, include: The preheating section drum (1), the fixed section (2) and the reaction section drum (3) are connected in sequence from high to low. The fixed section (2) is equipped with a hot air supply device (10) and a natural gas supply device (11). A feeding device (8) is provided at one end of the preheating section drum (1) away from the fixed section (2); The reaction section rotary drum (3) is equipped with a kiln tail slag discharge box and a heat source natural gas ignition device (9) at the end opposite to the fixed section (2).

2. The rotary kiln according to claim 1, characterized in that, The preheating section drum (1) is driven to rotate by the preheating section driving device (4), and the reaction section drum (3) is driven to rotate by the reaction section driving device (5). The preheating section drive device (4) and the reaction section drive device (5) have the same structure.

3. A rotary kiln according to claim 1 or 2, characterized in that, Multiple preheating section support devices (6) are provided at intervals along the axial direction of the preheating section drum (1), and multiple reaction section support devices (7) are provided at intervals along the axial direction of the reaction section drum (3). The fixed section (2) is supported by the fixed section support foundation; The preheating section drum (1), the fixed section (2), and the reaction section drum (3) are arranged at the same tilt angle.

4. A rotary kiln according to claim 3, characterized in that, The preheating section support device (6) and the reaction section support device (7) have the same structure. The preheating section support device (6) includes a support base (61) and a pair of rollers (62). The pair of rollers (62) are spaced apart on the support base (61). The axis of the rollers (62) is parallel to the axis of the preheating section drum (1). The pair of rollers (62) are used to support the preheating section drum (1) from both sides below and rotate together with the preheating section drum (1).

5. A rotary kiln according to claim 4, characterized in that, A pair of thrust rollers (63) are also provided on the preheating section support device (6) or the reaction section support device (7) near the fixed section (2). The pair of thrust rollers (63) are spaced apart between the pair of support rollers (62) along the axial direction of the preheating section drum (1) or the reaction section drum (3). The pair of thrust rollers (63) are collinear. The preheating section drum (1) and the reaction section drum (3) are respectively provided with annular convex rings on their outer circumferences. A pair of the baffle wheels (63) are respectively provided on both sides of the annular convex rings. The axis of the baffle wheel (63) is perpendicular to the axis of the support wheel (62).

6. A rotary kiln according to claim 5, characterized in that, The stop wheel (63) is a hydraulic stop wheel.

7. A rotary kiln according to claim 1, characterized in that, The working inner diameters of the preheating section rotating cylinder (1), the fixed section (2), and the reaction section rotating cylinder (3) are all the same. The preheating section rotating cylinder (1) and the reaction section rotating cylinder (3) have the same structure. The preheating section rotating cylinder (1) includes: a preheating section cylinder body and a preheating section castable layer disposed on the inner side of the preheating section cylinder body.

8. A rotary kiln according to claim 7, characterized in that, The fixed section (2) includes: a fixed section cylinder and a fixed section castable layer disposed inside the fixed section cylinder; Sealing devices are provided at both ends of the connection between the fixed section cylinder and the preheating section cylinder and the reaction section cylinder. The sealing devices include: fish scales, steel wire rope and counterweight. Multiple fish scales are arranged in a ring around the connection between the fixed section cylinder and the preheating section cylinder or the fixed section cylinder and the reaction section cylinder. The steel wire rope is arranged around one end of the fish scale near the fixed section cylinder, and the other end of the fish scale away from the fixed section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder. The two ends of the wire rope are respectively connected to the counterweights.

9. A rotary kiln according to claim 8, characterized in that, The steel wire rope is connected to the fish scale through a connector. The connector is arranged parallel to the fish scale. One end of the connector and the end of the fish scale away from the fixed section (2) are fixed together on the preheating section cylinder or the reaction section cylinder. The other end of the connector is hooked to hook the steel wire rope. A pulley is installed at the connection between the fixed section (2) and the preheating section cylinder or at the connection between the fixed section (2) and the reaction section cylinder via a bracket, and the steel wire rope passes through the tail end of the pulley and connects to the counterweight.

10. A rotary kiln according to claim 1, characterized in that, Also includes: A kiln shell spray cooling device is provided above the reaction section rotating drum (3). The kiln shell spray cooling device includes a spray pipe, a water pump, a water pump and a water collection device. The spray pipe is provided above the reaction section rotating drum (3) along the length direction of the reaction section rotating drum (3). The spray pipe has multiple spray nozzles for spraying cooling water onto the outer periphery of the reaction section rotating drum (3). The water collection device is provided below the reaction section rotating drum (3), and the water collection device is used to collect the cooling water flowing down along the outer periphery of the reaction section rotating drum (3); The water collection device is connected to the spray pipe via the water pump and the water pumping pipe.

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