Rotary kiln

Abstract

The rotary kiln 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 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 beneficial effects that roasting of different materials and metal recovery can be achieved, the production bottleneck restricting company productivity improvement is solved, meanwhile, coke powder or anthracite is replaced with natural gas, the productivity of the rotary kiln can be greatly improved, energy consumption is reduced, and the metal recovery rate is increased. 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] The invention relates to the technical field of metal recovery, in particular to a rotary kiln. Background Art

[0002] Hydrometallurgy is a major method of modern zinc smelting, and its output accounts for more than 85% of the world's total zinc output. In this process, zinc concentrate undergoes roasting, leaching, leachate purification and electrolysis to finally obtain metallic zinc or zinc compounds. However, the leaching residue produced during the acid leaching process contains high levels of valuable metals such as zinc and lead. If it is not recycled, it will not only cause a waste of resources, but also pollute the environment. Therefore, the effective treatment and resource utilization of leaching residue is particularly important.

[0003] At present, most companies use a rotary kiln to roast leached slag to recover valuable metals. During roasting, the materials (leached slag, added coke powder) move from the kiln tail to the kiln head under the rotation and tilt of the kiln body, and the materials begin to undergo oxidation reaction as they move. The industry's existing traditional self-heating roasting rotary kiln is a one-stage type. The entire rotary kiln cylinder is divided into two areas: the preheating section and the reaction section during operation. Due to the influence of the cylinder speed, the effective inner diameter of the cylinder and the feed amount during operation, the flue gas heat in the preheating section and the reaction section restricts and interferes with each other, the thermal energy is not well utilized, the added coke powder is not fully burned, the equipment has a low output, and the energy consumption is high. With the increase in the company's production capacity, the traditional rotary kiln 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 current research focuses. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a rotary kiln, which is suitable for the oxidation roasting of zinc ore, the roasting of intermediate materials of zinc hydrometallurgy (copper slag, cobalt slag, lead slag, acid leaching slag) and the roasting of lithium metal, and is also suitable for cement roasting.

[0005] The technical solution of the present invention to solve the above 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 the fixed section is respectively provided with a hot air supply device and a natural gas supply device;

[0006] A feeding device is provided at one end of the preheating section rotating drum away from the fixed section;

[0007] The end of the reaction section rotary drum away from the fixed section is provided with a kiln tail slag box and a heat source natural gas ignition device.

[0008] The beneficial effects of the present invention are: the new three-stage rotary kiln can realize the roasting of different materials and metal recovery, which not only solves the production bottleneck that restricts the company's capacity increase, but also uses natural gas to replace coke powder or anthracite, which can greatly increase the capacity of the rotary kiln, reduce energy consumption, and improve the metal recovery rate. At the same time, due to the increase in metal recovery rate, the improvement of processing capacity and the reduction of energy consumption, the production cost is significantly reduced and the energy utilization efficiency is improved.

[0009] Based on the above technical solution, the present invention can also be 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 stage driving device and the reaction stage driving device have the same structure.

[0012] The beneficial effects of adopting the above further scheme 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 is conducive to the standardized production and maintenance of the equipment; the preheating section rotor and the reaction section rotor are driven by the transmission system, thereby achieving efficient and stable driving of the preheating section rotor and the reaction section rotor, which is conducive to improving production efficiency and product quality.

[0013] Furthermore, a plurality of preheating section support devices are arranged at intervals along the axial direction of the preheating section drum, and a plurality of reaction section support devices are arranged at intervals along the axial direction of the reaction section drum;

[0014] The fixed segment is supported by a fixed segment support foundation;

[0015] The preheating section rotary drum, the fixed section rotary drum and the reaction section rotary drum are arranged along the same inclination angle.

[0016] The beneficial effect of adopting the above further solution is that the setting of the inclination angle helps the material to be evenly distributed and flow in the preheating section drum and the reaction section drum. A plurality of support devices arranged at intervals along the axial direction provide stable support for the preheating section drum and the reaction section drum, which is conducive to the stable rotation of the preheating section drum and the reaction section drum, and enhances the structural stability of the entire device.

[0017] Furthermore, the preheating section support device and the reaction section support device have the same structure, and the preheating section support device comprises: a support base and a pair of supporting wheels, wherein the pair of supporting wheels are arranged on the support base at intervals, and the axes of the supporting wheels are parallel to the axis of the preheating section rotating drum, and the pair of supporting wheels are used to support the preheating section rotating drum from both sides below the preheating section rotating drum and rotate together with the preheating section rotating drum.

[0018] The beneficial effect of adopting the above further scheme is that the preheating section support device and the reaction section support device provide stable support for the preheating section rotary drum and the reaction section rotary drum through a support base and a pair of supporting wheels which are parallel to each other and installed at intervals, thereby ensuring that the preheating section rotary drum can rotate smoothly and reducing vibration and noise caused by unstable support.

[0019] Furthermore, a pair of stop wheels is also provided on the preheating section support device or the reaction section support device close to the fixed section, and the pair of stop wheels are arranged between the pair of support wheels along the axial direction of the preheating section drum or the reaction section drum, and the pair of stop wheels are arranged in a colinear manner;

[0020] Annular convex rings are circumferentially arranged on the outer circumferences of the preheating stage drum and the reaction stage drum, and a pair of stop wheels are respectively arranged on both sides of the annular convex rings, and the axes of the stop wheels are arranged perpendicular to the axes of the supporting wheels.

[0021] The beneficial effect of adopting the above-mentioned further scheme is that the cooperation between the stop wheel and the annular convex ring ensures that the drum always runs along the predetermined trajectory during the rotation process. The setting of the stop wheel further limits the axial movement of the preheating section drum or the reaction section drum during operation, prevents vibration and instability caused by axial movement, helps to maintain the smooth operation of the equipment, and improves production efficiency and product quality.

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

[0023] The beneficial effect of adopting the above further scheme is that the hydraulic wheel stop system can achieve precise control of heavy equipment such as the kiln body through the precise supply and release of hydraulic oil, making the wheel stop more stable during operation, thereby improving the operating stability and production efficiency of the entire equipment.

[0024] Furthermore, the working inner diameters of the preheating section rotor, the fixed section and the reaction section rotor are the same, the preheating section rotor has the same structure as the reaction section rotor, and the preheating section rotor includes: a preheating section cylinder body and a preheating section castable layer arranged inside the preheating section cylinder body.

[0025] The beneficial effects of adopting the above further scheme are: the preheating section rotor and the reaction section rotor adopt the same structure, which helps to achieve standardization and interchangeability of equipment and 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 easy to install and maintain.

[0026] Furthermore, the fixed section comprises: a fixed section cylinder and a fixed section casting material layer arranged inside the fixed section cylinder;

[0027] The two ends of the fixed section cylinder connected to the preheating section cylinder and the reaction section cylinder are respectively provided with sealing devices, and the sealing devices include: fish scales, steel wire ropes and counterweights, and a plurality of the fish scales are arranged in a ring shape in the circumferential direction at 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 sheet close to the fixed section cylinder, and one end of the fish scale sheet away from the fixed section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder;

[0029] Both ends of the steel wire rope are respectively connected with the counterweight.

[0030] The beneficial effect of adopting the above further scheme is: by arranging a fish-scale type sealing device at the connection between the fixed section cylinder, the preheating section cylinder and the reaction section cylinder, these fish-scales can be tightly arranged in a ring shape in the circumferential direction, cooperate with the steel wire rope and connect the counterweights at both ends of the steel wire rope, so as to have good sealing performance and ensure the stability and efficiency of the process.

[0031] Further, the steel wire rope is connected to the fish scale through a connector, the connector is arranged in parallel with the fish scale, one end of the connector is fixed to the preheating section cylinder or the reaction section cylinder together with an end of the fish scale away from the fixed section, and the other end of the connector is arranged in a hook shape for hooking the steel wire rope;

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

[0033] The beneficial effects of adopting the above further scheme are: by arranging the connecting piece in parallel with the fish scales and fixing them together on the preheating section cylinder or the reaction section cylinder, a tight connection between the two is ensured, which is not easy to loosen or fall off, thereby improving the firmness of the entire structure; the other end of the connecting piece is designed to be hook-shaped, making the connection and removal of the wire rope more convenient. The setting of the pulley makes the wire rope move more smoothly, so that the counterweight can maintain balance when moving, thereby ensuring the stable operation of the entire system.

[0034] Further, it also includes: a kiln shell spray cooling device, the kiln shell spray cooling device is arranged above the reaction section drum, the kiln shell spray cooling device includes: a spray pipe, a water pump, a water pump and a water collecting device, the spray pipe is arranged above the reaction section drum along the length direction of the reaction section drum, and a plurality of spray ports are opened on the spray pipe for spraying cooling water to the periphery of the reaction section drum;

[0035] The water collecting device is arranged below the reaction section drum, and the water collecting device is used to collect the cooling water flowing down along the periphery of the reaction section drum;

[0036] The water collecting device is connected with the spray pipe through the water pump and the water pump pipe.

[0037] The beneficial effects of adopting the above-mentioned further scheme are as follows: the spray pipe is arranged along the length direction 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, and multiple evenly distributed spray ports further enhance the uniformity and coverage area of ​​the spray, thereby achieving more comprehensive and efficient cooling of the reaction section drum; a water collection device is provided to collect the spray water flowing along the periphery of the reaction section drum, and it is re-transported to the spray pipe through a water pump and a water pump pipe for re-spraying, thereby achieving the recycling of cooling water and reducing the operating cost during the cooling process, which is in line with the current green and environmentally friendly production concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0039] Figure 2 It is a structural schematic diagram of a preheating section support device without a blocking wheel in an embodiment of the present invention;

[0040] Figure 3 The figure is a schematic structural diagram of a preheating section support device with a retaining wheel in one embodiment of the present invention.

[0041] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0042] 1. Preheating section drum; 2. Fixed section; 3. Reaction section drum; 4. Preheating section driving device; 5. Reaction section driving device; 6. Preheating section supporting device; 7. Reaction section supporting device; 8. Feeding device; 9. Heat source natural gas ignition device; 10. Hot air supply device; 11. Natural gas supply device; 61. Support base; 62. Support wheel; 63. Stop wheel. DETAILED DESCRIPTION

[0043] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0044] like Figure 1As shown, the present invention provides a rotary kiln, comprising: a preheating section rotary drum 1, a fixed section 2 and a reaction section rotary drum 3 connected in sequence from high to low, the preheating section rotary drum 1, the fixed section 2 and the reaction section rotary drum 3 are connected in sequence to form a three-stage rotary kiln with an inclined arrangement, the preheating section rotary drum 1 and the reaction section rotary drum 3 are rotatably mounted at both ends of the fixed section 2, wherein a feeding device 8 is connected to the kiln tail end of the preheating section rotary drum 1 away from the fixed section 2, specifically, the feeding device 8 can be a disc feeder, and the disc feeder is connected to the inside of the preheating section rotary drum 1 through a feeding pipe. A kiln tail slag box and a heat source natural gas ignition device 9 are connected to the kiln head end of the reaction section rotary drum 3 away from the fixed section 2. In order to optimize the volatilization process of the rotary kiln, improve the production capacity of the rotary kiln, 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] The materials processed by the rotary kiln include, but are not limited to, leached slag, copper slag, lead slag, cobalt slag, zinc oxide and zinc oxide ore, lithium ore, etc., which are produced by zinc smelting. These materials are pre-roasted in the first rotary kiln, i.e., the preheating section drum 1. Natural gas and air or oxygen are introduced into the fixed section 2 to raise the temperature of the materials again. After that, the materials are sent into the second rotary kiln, i.e., the reaction section drum 3, to complete the secondary roasting of the materials and the enrichment and recovery of the valuable elements of the materials. By introducing hot air and natural gas into the fixed section 2, the materials entering the furnace are quickly dried and heated and decomposed in the preheating section, which is conducive to the full contact between the roasted materials and the oxygen-containing flue gas, and the oxidation reaction is sufficient, so that the valuable elements in the materials can be more fully enriched and recovered; with the oxygen concentration and temperature detection means, the temperature and reaction atmosphere in the kiln can be flexibly adjusted to achieve precise control, which can not only greatly reduce energy consumption, increase production capacity, save costs, but also improve the metal recovery rate. According to on-site verification, the improved rotary kiln can increase the recovery rate of the above metal elements by more than 15% compared with the ordinary rotary kiln treatment, increase the processing capacity by more than 10%, reduce energy consumption by 20%, and save more than 10 million yuan in costs annually.

[0046] In this embodiment, the new three-stage rotary kiln can realize the roasting of different materials and metal recovery, which not only solves the production bottleneck that restricts the company's capacity expansion, but also uses natural gas instead of coke powder or anthracite, which can greatly increase the capacity of the rotary kiln, reduce energy consumption, and increase the metal recovery rate. At the same time, due to the increase in metal recovery rate, the improvement of processing capacity and the reduction of energy consumption, the production cost is significantly reduced and the energy utilization efficiency is improved.

[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, and the preheating section drive device 4 and the reaction section drive device 5 have the same structure, and the preheating section drum 1 and the reaction section drum 3 are driven to rotate in the same direction by the preheating section drive device 4 and the reaction section drive device 5 respectively. Specifically, the preheating section drive device 4 and the reaction section drive device 5 are respectively composed of a set of transmission systems. The transmission system contains a main transmission system and an auxiliary transmission system. The main transmission system is composed of a main motor, a coupling, a main reducer, a pinion, etc. The auxiliary transmission system is composed of an auxiliary motor, a coupling, a helical clutch, an auxiliary reducer, etc. A large gear ring device is fixed on the cylinder of the preheating section drum 1 and the reaction section drum 3 to transmit torque. The large gear ring is connected to the cylinder through a tangential spring plate and meshes with the large gear ring through a pinion. The pinion is installed 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 cylinder to rotate step by step. The structures of the preheating section drive device 4 and the reaction section drive device 5 have been widely disclosed and will not be elaborated 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 preheating section rotor 1 and the reaction section rotor 3 are driven by the transmission system, thereby achieving efficient and stable driving of the preheating section rotor 1 and the reaction section rotor 3, which is beneficial to improving production efficiency and product quality.

[0049] like Figure 1 As shown, a plurality of preheating section support devices 6 are arranged at intervals along the axial direction of the preheating section drum 1, and a plurality of reaction section support devices 7 are arranged at intervals 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, the fixed section 2 can be supported by the fixed section support base. 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 setting of the inclination angle helps the material to be evenly distributed and flow in the preheating section drum 1 and the reaction section drum 3. A plurality of support devices arranged at intervals along the axial direction provide stable support for the preheating section drum 1 and the reaction section drum 3, which is conducive to the stable rotation of the preheating section drum 1 and the reaction section drum 3 and enhances the structural stability of the entire device.

[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 takes the preheating section support device 6 as an example for description, and the preheating section support device 6 comprises: a support base 61 and a pair of supporting wheels 62, wherein the pair of supporting wheels 62 are installed on the support base 61 at intervals, the pair of supporting wheels 62 are arranged parallel to each other, and the interval between the pair of supporting wheels 62 ensures that the pair of supporting wheels 62 can support the preheating section rotating drum 1 from both sides close to the bottom of the preheating section rotating drum 1 and rotate with the preheating section rotating drum 1. In the specific setting, the axis of the supporting wheel 62 is arranged parallel to the axis of the preheating section rotating 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 a support base 61 and a pair of supporting wheels 62 which are parallel to each other and installed at intervals, thereby 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 solution, since the fixed section 2 remains fixed and does not rotate during operation, a pair of stop 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, and the pair of stop wheels 63 are arranged between a pair of supporting wheels 62. Specifically, the stop wheels 63 are arranged in a colinear manner along the axial spacing of the preheating section drum 1 or the reaction section drum 3, and the axis of the stop wheel 63 is arranged perpendicular to the axis of the supporting wheel 62. In addition, an annular convex ring is formed on the outer periphery of the preheating section drum 1 and the outer periphery of the reaction section drum 3, and the annular convex ring is arranged around the outer periphery of the preheating section drum 1 or the reaction section drum 3. The pair of stop wheels 63 are respectively arranged on both sides of the annular convex ring on the outer periphery of the preheating section drum 1 or the reaction section drum 3, thereby further limiting that the annular convex ring is always kept between the pair of stop wheels 63 during operation.

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

[0055] In some preferred embodiments, the stopper wheel 63 can be a hydraulic stopper wheel, which is mainly composed of an oil cylinder, a stopper wheel 63, a stopper wheel shaft, a slide seat, a guide shaft, a rolling bearing, and a stopper wheel lubrication device. When the pressure oil of the stopper wheel hydraulic station enters the oil cylinder, it pushes the piston and piston rod in the oil cylinder to drive the stopper wheel 63, thereby driving the associated cylinder part to move upward. When it moves to a certain distance, the upper limit position triggers the upper limit switch, causing the valve parts in the hydraulic oil station to change direction, and the oil pump motor to stop; the oil in the oil cylinder slowly flows to the oil tank under the weight of the kiln body, and the kiln body and the stopper wheel 63 slowly move downward; when it moves to the lower limit position, it triggers the lower limit switch, the valve parts change direction, the oil pump motor starts, and the pressure oil is slowly injected into the oil cylinder, and the stopper wheel 63 drives the kiln body to move upward. This is repeated repeatedly to make the kiln body float up and down within the specified stroke. Since the existing technology is relatively complete, it will not be elaborated here.

[0056] In this embodiment, the hydraulic wheel stopper system can achieve precise control of heavy equipment such as the kiln body through the precise supply and release of hydraulic oil, so that the wheel stopper 63 is more stable during operation, thereby improving the operating stability and production efficiency of the entire 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 the same. The preheating section drum 1 has the same structure as the reaction section drum 3. The preheating section drum 1 includes: a preheating section drum body and a preheating section castable layer arranged on the inner side of the preheating section drum body. Similarly, the reaction section drum 3 includes: a reaction section drum body and a reaction section castable layer arranged on the inner side of the reaction section drum body. The castable layer can be made of refractory material. The preheating section drum 1 and the reaction section drum 3 adopt the same structure, which helps to achieve standardization and interchangeability of equipment 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 easy to install and maintain.

[0058] In this embodiment, the fixed section 2 includes: a fixed section cylinder and a fixed section casting material layer arranged inside the fixed section cylinder. In addition, sealing devices are respectively arranged at both ends of the fixed section cylinder connected to the preheating section cylinder and the reaction section cylinder. The sealing device adopts fish scales. A plurality of fish scales are closely arranged in a ring-shaped sealing device 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 close to the preheating section cylinder or the reaction section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder. The end of the fish scale close to the fixed section cylinder is wrapped with a steel wire rope around the sealing device. Specifically, the steel wire rope can be arranged around the sealing device through a connecting piece. One end of the connecting piece and the end of the fish scale away from the fixed section 2 are fixed on the preheating section rotating drum 1 or the reaction section rotating drum 3. The other end of the connecting piece is arranged in a hook shape so that the steel wire rope can be hooked. It can be imagined that a plurality of connecting pieces are arranged circumferentially on the sealing device to install the steel wire rope. At the same time, the two ends of the steel wire rope are respectively connected with counterweights. 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 tail end of the wire rope is connected to the counterweight after the wire rope passes through the pulley.

[0059] In this embodiment, a fish-scale sealing device is provided at the connection between the fixed section cylinder, the preheating section cylinder and the reaction section cylinder. These fish-scales can be tightly arranged in a ring shape in the circumferential direction, cooperate with the steel wire rope and connect the counterweights at both ends of the steel wire rope, so as to have good sealing performance and ensure the stability and efficiency of the process.

[0060] In some feasible embodiments, a kiln shell spray cooling device is further provided above the reaction section drum 3, and the kiln shell spray cooling device specifically comprises: a spray pipe, a water pump, a water pump and a water collecting device, wherein the spray pipe is provided above the reaction section drum 3 along the length direction of the reaction section drum 3, and the spray pipe is provided along the central axis of the reaction section drum 3, and the spray cooling effect is better. A plurality of spray ports are evenly provided on the spray pipe, and cooling water is sprayed to the periphery of the reaction section drum 3 through the spray ports, so as to cool the reaction section drum 3.

[0061] In addition, a water collecting device is also provided below the reaction section drum 3. The water collecting device may be a water collecting tank body, through which the cooling water flowing down along the periphery of the reaction section drum 3 is collected. In order to realize the recycling of cooling water, a water pump is also installed in the water collecting 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 provided to provide cooling water for cooling the peripheral wall of the reaction section drum 3. When sufficient cooling water is stored in the water collecting device, the water collected in the water collecting device is used to cool the reaction section drum 3 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 direction of the reaction section 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 drum 3, and a plurality of evenly distributed spray ports further enhance the uniformity and coverage area of ​​the spray, thereby achieving more comprehensive and efficient cooling of the reaction section drum 3; a water collecting device is provided to collect the spray water flowing along the periphery of the reaction section drum 3, and the water is re-transported to the spray pipe through a water pump and a water pump pipe for re-spraying, thereby achieving the recycling of cooling water and reducing the operating cost during the cooling process, which is in line with the current green and environmentally friendly production concept.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A rotary kiln, characterized in that: include: A preheating section rotary drum (1), a fixed section (2) and a reaction section rotary drum (3) are connected in sequence from high to low, wherein the fixed section (2) is provided 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 end of the reaction section rotary drum (3) facing away from the fixed section (2) is provided with a kiln tail slag box and a heat source natural gas ignition device (9).

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

3. A rotary kiln according to claim 1 or 2, characterized in that: A plurality of preheating section support devices (6) are arranged at intervals along the axial direction of the preheating section drum (1), and a plurality of reaction section support devices (7) are arranged at intervals along the axial direction of the reaction section drum (3); The fixed section (2) is supported by a fixed section supporting foundation; The preheating section rotary drum (1), the fixed section (2) and the reaction section rotary drum (3) are arranged along the same inclination 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) comprises: a support base (61) and a pair of supporting wheels (62). The pair of supporting wheels (62) are arranged on the support base (61) at intervals. The axes of the supporting wheels (62) are parallel to the axis of the preheating section drum (1). The pair of supporting wheels (62) are used to support the preheating section drum (1) from both sides below the preheating section drum (1) and rotate together with the preheating section drum (1).

5. A rotary kiln according to claim 4, characterized in that: A pair of stop wheels (63) is also provided on the preheating section support device (6) or the reaction section support device (7) near the fixed section (2), and the pair of stop wheels (63) are arranged between the pair of support wheels (62) at intervals along the axial direction of the preheating section rotary drum (1) or the reaction section rotary drum (3), and the pair of stop wheels (63) are arranged in a colinear manner; Annular convex rings are circumferentially arranged on the outer circumferences of the preheating stage drum (1) and the reaction stage drum (3), and a pair of stop wheels (63) are respectively arranged on both sides of the annular convex rings, and the axes of the stop wheels (63) are arranged perpendicular to the axes of the supporting wheels (62).

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

7. A rotary kiln according to claim 1, characterized in that: 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 the same structure. The preheating section drum (1) comprises: a preheating section drum body and a preheating section castable layer arranged inside the preheating section drum body.

8. A rotary kiln according to claim 7, characterized in that: The fixed section (2) comprises: a fixed section cylinder and a fixed section casting material layer arranged inside the fixed section cylinder; The two ends of the fixed section cylinder connected to the preheating section cylinder and the reaction section cylinder are respectively provided with sealing devices, and the sealing devices include: fish scales, steel wire ropes and counterweights, and a plurality of the fish scales are arranged in a ring shape in the circumferential direction at 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 sheet close to the fixed section cylinder, and one end of the fish scale sheet away from the fixed section cylinder is fixedly connected to the preheating section cylinder or the reaction section cylinder; Both ends of the steel wire rope are respectively connected with the counterweight.

9. A rotary kiln according to claim 8, characterized in that: The steel wire rope is connected to the fish scale through a connecting piece, the connecting piece is arranged in parallel with the fish scale, one end of the connecting piece is fixed to the preheating section cylinder or the reaction section cylinder together with the end of the fish scale away from the fixing section (2), and the other end of the connecting piece is arranged in a hook shape for hooking the steel wire rope; A pulley is installed at the connection between the fixed section (2) and the preheating section cylinder or the connection between the fixed section (2) and the reaction section cylinder through a bracket, and the steel wire rope passes through the tail end of the pulley to connect to the counterweight.

10. A rotary kiln according to claim 1, characterized in that: Also includes: A kiln shell spray cooling device, the kiln shell spray cooling device is arranged above the reaction section drum (3), the kiln shell spray cooling device comprises: a spray pipe, a water pump, a water pump and a water collecting device, the spray pipe is arranged above the reaction section drum (3) along the length direction of the reaction section drum (3), and a plurality of spray ports are provided on the spray pipe for spraying cooling water to the periphery of the reaction section drum (3); The water collecting device is arranged below the reaction section drum (3), and is used to collect the cooling water flowing down along the periphery of the reaction section drum (3); The water collecting device is connected with the spray pipe through the water pump and the water pump pipe.

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