Energy-saving magnesite calcining rotary kiln

Abstract

The utility model relates to the technical field of metal smelting, and specifically discloses an energy-saving magnesite calcination rotary kiln, which comprises a rotary kiln main body for magnesite calcination, and an installation cylinder is connected to the air intake of the rotary kiln main body, two rotating rings are rotatably arranged on the inner wall of the cylinder body of the installation cylinder, and a main vane is arranged inside the rotating ring; in the utility model, the high-temperature waste gas is sent into the corresponding long cylinder and short cylinder through the secondary vane, and then the long cylinder and hot air pipe and the short cylinder and cold air pipe are used to provide high-temperature preheating gas and low-temperature cooling gas in the rotary kiln main body; that is, in the present scheme, the high-temperature waste gas is used multiple times, which on the one hand strengthens the preheating effect of the rotary kiln main body on the material, and on the other hand saves the need for additional fans during material cooling, reduces the energy consumption of the rotary kiln main body, improves the energy utilization efficiency of the rotary kiln main body, and thus makes the present scheme more energy-saving than the traditional scheme.

Description

Technical Field

[0001] This utility model relates to the field of metal smelting technology, and in particular to an energy-saving rotary kiln for calcining magnesite. Background Technology

[0002] An existing Chinese patent application with application number 202120566007.5 discloses an energy-saving rotary calcining device for light calcination of magnesite, comprising a preheating zone, a calcining zone, and a cooling zone. The calcining zone is located within an inclined rotary cylinder. The high end of the rotary cylinder is connected to a vertically fixed preheating zone cylinder via a first rotary sealing joint and a first elbow. The low end of the rotary kiln is connected to a vertically fixed cooling zone cylinder via a second rotary sealing joint and a second elbow. The rotary cylinder is provided with several support rings, the bottom of which rolls in contact with two left and right support rollers. The support rollers are mounted on a support frame, and at least one support roller is connected to a transmission device. The top of the preheating zone cylinder has a feed inlet, and the bottom of the cooling zone cylinder has a discharge outlet. A discharge machine is located inside the discharge outlet.

[0003] The above-mentioned technology provides cooling gas by adding an extra cooling fan, but this method increases energy consumption and reduces the energy efficiency of the equipment. Therefore, to address these technical shortcomings, we propose an energy-saving rotary kiln for calcining magnesite. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an energy-saving rotary kiln for calcining magnesite.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An energy-saving rotary kiln for calcining magnesite includes a main body for calcining magnesite. An installation cylinder is connected to the air inlet of the main body. Two rotating rings are rotatably arranged on the inner wall of the installation cylinder. A main blade fan is arranged inside the rotating ring. A rotating cylinder is arranged on the outer wall of the installation cylinder corresponding to the rotating ring. Magnetic plates are arranged on the outer wall of the rotating ring and the inner wall of the rotating cylinder. A secondary blade fan is installed on the outer wall of the rotating cylinder. A long cylinder and a short cylinder are respectively arranged on the outer wall of the installation cylinder corresponding to the secondary blade fan. A hot air pipe is connected between the end of the long cylinder away from the secondary blade fan and the preheating zone cylinder of the main body of the rotary kiln. A cold air pipe is connected between the short cylinder and the cooling zone cylinder of the main body of the rotary kiln.

[0007] Preferably, the outer circumference of the mounting cylinder is provided with heat exchange fins on the body wall inside the long cylinder, and a plurality of heat exchange fins are arranged alternately.

[0008] Preferably, the cold air duct is equipped with several heat dissipation fins, and the hot air duct and the long cylinder are provided with an insulation sleeve.

[0009] Preferably, the mounting cylinder wall is provided with a receiving groove corresponding to the rotating ring and the rotating cylinder, and the rotating ring and the rotating cylinder are connected to the mounting cylinder through the receiving groove.

[0010] Preferably, the receiving groove is provided with annular grooves on both sides, and the annular grooves are provided with matching limiting rings corresponding to the rotating ring and the rotating cylinder.

[0011] Preferably, the magnetic attracting pieces are in several groups, with each group consisting of two magnetic attracting pieces respectively disposed on the outer wall of the rotating ring and the inner wall of the rotating cylinder.

[0012] Preferably, the main blades are provided with a guide column in the middle, and the two ends of the guide column are arc-shaped.

[0013] The energy-saving rotary kiln for calcining magnesite proposed in this utility model has the following advantages:

[0014] 1. In this invention, high-temperature exhaust gas flows sequentially through two main fan blades inside the mounting cylinder. As the main fan blades rotate, they draw fresh air from the outside into the corresponding long and short cylinders via auxiliary fan blades. The fresh air then flows back into the rotary kiln body from the long and short cylinders through hot and cold air pipes. Subsequently, the long cylinder and hot air pipe, and the short cylinder and cold air pipe provide high-temperature preheating gas and low-temperature cooling gas to the rotary kiln body. In other words, by utilizing the high-temperature exhaust gas multiple times, this solution enhances the preheating effect of the rotary kiln body on the material and eliminates the need for additional fans for material cooling. This reduces the energy consumption of the rotary kiln body and improves its energy utilization efficiency, making this solution more energy-efficient than traditional solutions.

[0015] 2. The heat exchange fins in this invention allow heat inside the mounting cylinder to be transferred to the heat exchange fins, thereby increasing the efficiency of heat exchange between the mounting cylinder and the gas blown out by the auxiliary fan blades, effectively reducing the heat generated when the exhaust gas flows through the short cylinder. The heat dissipation fins also help reduce the heat of the gas flowing through the cold air duct, resulting in a lower gas temperature introduced into the rotary kiln body, which facilitates cooling of the material in the cooling zone of the rotary kiln body. The receiving groove helps reduce the distance between the rotating ring and the rotating cylinder, thereby improving the strength of the attraction between the magnetic plates. The limiting ring improves the stability of the rotating ring and the rotating cylinder when they rotate around the mounting cylinder. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an energy-saving rotary kiln for calcining magnesite proposed in this utility model;

[0017] Figure 2 This is a schematic diagram showing the fit between the long cylinder, short cylinder, and mounting cylinder of an energy-saving rotary kiln for calcining magnesite according to this utility model.

[0018] Figure 3 This is a schematic diagram of the cooperation between the rotating ring and the rotating cylinder of an energy-saving rotary kiln for calcining magnesite proposed in this utility model.

[0019] Figure 4 This is a schematic diagram showing the disassembly of the rotating ring and rotating cylinder of an energy-saving rotary kiln for calcining magnesite, as proposed in this utility model.

[0020] In the diagram: 1. Rotary kiln body; 2. Mounting cylinder; 3. Rotating ring; 4. Rotating cylinder; 5. Secondary blade fan; 6. Long cylinder; 7. Short cylinder; 8. Hot air duct; 9. Cold air duct; 10. Heat exchange fins; 11. Heat dissipation fins; 12. Main blade fan; 13. Magnetic suction plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1

[0023] Reference Figure 1-4 An energy-saving rotary kiln for calcining magnesite includes a rotary kiln body 1 for calcining magnesite. An installation cylinder 2 is connected to the air inlet of the rotary kiln body 1. Two rotating rings 3 are rotatably arranged on the inner wall of the installation cylinder 2. A main blade fan 12 is arranged inside the rotating ring 3. A rotating cylinder 4 is arranged on the outer wall of the installation cylinder 2 corresponding to the rotating ring 3. Magnetic suction plates 13 are arranged on the outer wall of the rotating ring 3 and the inner wall of the rotating cylinder 4. A secondary blade fan 5 is installed on the outer wall of the rotating cylinder 4. A long cylinder 6 and a short cylinder 7 are arranged on the outer wall of the installation cylinder 2 corresponding to the secondary blade fan 5. A hot air pipe 8 is connected between the end of the long cylinder 6 away from the secondary blade fan 5 and the preheating zone cylinder of the rotary kiln body 1. A cold air pipe 9 is connected between the short cylinder 7 and the cooling zone cylinder of the rotary kiln body 1.

[0024] Example 2

[0025] Reference Figure 1-4 While all other parts are the same as in Example 1, the difference between this example and Example 1 is that:

[0026] Heat exchange fins 10 are provided on the outer ring surface of the mounting cylinder 2, located on the inner wall of the long cylinder 6. Several heat exchange fins 10 are staggered, allowing heat inside the mounting cylinder 2 to be transferred to the heat exchange fins 10, thereby increasing the efficiency of heat exchange between the mounting cylinder 2 and the gas blown out by the auxiliary fan 5, effectively reducing the heat generated when the exhaust gas passes through the short cylinder 7. Several heat dissipation fins 11 are installed on the body of the cold air duct 9, and the hot air duct 8 and the long cylinder 6 are covered with an insulation sleeve. The setting of 11 facilitates the reduction of heat in the gas flowing through the cold air duct 9, thereby making the gas temperature introduced into the rotary kiln body 1 by the cold air duct 9 lower, and making it easier to cool the material in the cooling zone cylinder inside the rotary kiln body 1; the wall of the mounting cylinder 2 is provided with a receiving groove corresponding to the rotating ring 3 and the rotating cylinder 4. The rotating ring 3 and the rotating cylinder 4 are connected to the mounting cylinder 2 through the receiving groove. The setting of the receiving groove facilitates the reduction of the distance between the rotating ring 3 and the rotating cylinder 4, thereby improving the firmness of the attraction between the magnetic plates 13.

[0027] The receiving groove has annular grooves on both sides, and corresponding limiting rings are provided in the annular grooves to the rotating ring 3 and the rotating cylinder 4. The setting of the limiting rings improves the stability of the rotating ring 3 and the rotating cylinder 4 when they rotate around the mounting cylinder 2. There are several groups of magnetic suction plates 13, and each group has two magnetic suction plates 13, which are respectively set on the outer wall of the rotating ring 3 and the inner wall of the rotating cylinder 4. Since the magnetic suction plates 13 are set in pairs, the rotating ring 3 can drive the rotating cylinder 4 to rotate more stably when it rotates. The main blade fan 5 has a common guide column in the middle. The two ends of the guide column are arc-shaped. The setting of the guide column facilitates the guidance of the exhaust gas flow inside the mounting cylinder 2 to the main blade fan 12.

[0028] Operating principle and advantages: In the process of using this utility model, the installation cylinder 1 can be installed in an inclined upward state to facilitate the use of the chimney effect. The rotary kiln body 1 is the existing technology used for calcining magnesite. The high-temperature exhaust gas discharged from the rotary kiln body 1 enters the interior of the installation cylinder 2. Then, the high-temperature exhaust gas flows through the two main blade fans 12 in sequence inside the installation cylinder 2. When the main blade fans 12 rotate, they drive the rotating ring 3 to rotate. At this time, under the action of the magnetic suction plate 13, the rotating ring 3 drives the rotating cylinder 4 to rotate. When the rotating cylinder 4 rotates, it sends fresh air from the outside into the corresponding long cylinder 6 and short cylinder 7 through the auxiliary blade fan 5. Then, the fresh air flows back from the long cylinder 6 and short cylinder 7 to the rotary kiln body 1 through the hot air pipe 8 and the cold air pipe 9.

[0029] Furthermore, in the above process, due to the longer length of the long cylinder 6, the heat of the high-temperature exhaust gas is transferred to the long cylinder 6 through the mounting cylinder 2. The fresh air flowing through this cylinder then exchanges heat with it and, after absorbing heat and increasing its temperature, enters the preheating zone of the rotary kiln body 1 through the hot air pipe 8. This hot air preheats the material inside the preheating zone, thus improving the preheating effect of the material in the preheating zone of the rotary kiln body 1. Because the short cylinder 7 is shorter, the fresh air does not linger there, resulting in less heat absorption. Simultaneously, heat is dissipated through the heat dissipation fins 11 on the cold air pipe 9, and the high-temperature exhaust gas inside the mounting cylinder 2 passes through… The heat absorption and cooling at the long cylinder 6 prevents the air flowing through the cold air duct 9 from experiencing a significant temperature rise. This allows the fresh air at room temperature to flow back into the cooling zone of the rotary kiln body 1 to cool the calcined material. In summary, this scheme utilizes the high-temperature exhaust gas multiple times, fully leveraging the heat and kinetic energy in the exhaust gas discharged from the rotary kiln body 1. This enhances the preheating effect of the rotary kiln body 1 on the material and eliminates the need for an additional fan during material cooling, thus reducing the energy consumption of the rotary kiln body 1 and improving its energy efficiency. Therefore, this scheme is more energy-efficient than traditional schemes.

[0030] It should be further explained that the heat exchange fins 10 allow heat inside the mounting cylinder 2 to be transferred to the heat exchange fins 10, thereby increasing the efficiency of heat exchange between the mounting cylinder 2 and the gas blown out by the auxiliary fan 5, effectively reducing the heat when the exhaust gas flows through the short cylinder 7; the heat dissipation fins 11 facilitate the reduction of heat in the gas flowing through the cold air duct 9, resulting in a lower gas temperature introduced into the rotary kiln body 1 by the cold air duct 9, which is more convenient for cooling the material in the cooling zone of the rotary kiln body 1; the receiving groove facilitates the reduction of the distance between the rotating ring 3 and the rotating cylinder 4, thereby improving the firmness of the attraction between the magnetic plates 13; the limiting ring improves the stability of the rotating ring 3 and the rotating cylinder 4 when rotating around the mounting cylinder 2; since the magnetic plates 1 are arranged in pairs, the rotating ring 3 can more stably drive the rotating cylinder 4 to rotate; the guide column facilitates the guidance of the exhaust gas flow inside the mounting cylinder 2 to the main fan 12.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An energy-saving rotary kiln for calcining magnesite, comprising a rotary kiln body (1) for calcining magnesite, characterized in that, The rotary kiln body (1) is connected to an installation cylinder (2) at the air inlet. The inner wall of the installation cylinder (2) is provided with two rotating rings (3). The rotating rings (3) are provided with main blades (12). The outer wall of the installation cylinder (2) is provided with a rotating cylinder (4) corresponding to the rotating rings (3). The outer wall of the rotating rings (3) and the inner wall of the rotating cylinder (4) are provided with magnetic plates (13). The outer wall of the rotating cylinder (4) is provided with auxiliary blades (5). The outer wall of the installation cylinder (2) is provided with a long cylinder (6) and a short cylinder (7) corresponding to the auxiliary blades (5). The end of the long cylinder (6) away from the auxiliary blades (5) is connected to the preheating zone cylinder of the rotary kiln body (1) by a hot air pipe (8). The short cylinder (7) is connected to the cooling zone cylinder of the rotary kiln body (1) by a cold air pipe (9).

2. The energy-saving rotary kiln for calcining magnesite according to claim 1, characterized in that, The outer ring of the mounting cylinder (2) is provided with heat exchange fins (10) on the body wall inside the long cylinder (6), and several heat exchange fins (10) are arranged alternately.

3. The energy-saving rotary kiln for calcining magnesite according to claim 1, characterized in that, The cold air duct (9) is equipped with several heat dissipation fins (11), and the hot air duct (8) and the long cylinder (6) are provided with heat insulation sleeves.

4. The energy-saving rotary kiln for calcining magnesite according to claim 1, characterized in that, The mounting cylinder (2) has a receiving groove on its body wall corresponding to the rotating ring (3) and the rotating cylinder (4). The rotating ring (3) and the rotating cylinder (4) are connected to the mounting cylinder (2) through the receiving groove.

5. The energy-saving rotary kiln for calcining magnesite according to claim 4, characterized in that, The receiving groove is provided with annular grooves on both sides, and the annular grooves are provided with matching limiting rings corresponding to the rotating ring (3) and the rotating cylinder (4).

6. The energy-saving rotary kiln for calcining magnesite according to claim 1, characterized in that, The magnetic absorbing pieces (13) are in several groups, and each group of magnetic absorbing pieces (13) consists of two pieces, which are respectively arranged on the outer wall of the rotating ring (3) and the inner wall of the rotating cylinder (4).

7. The energy-saving rotary kiln for calcining magnesite according to claim 1, characterized in that, The main blade (12) is provided with a guide column in the middle, and the two ends of the guide column are arc-shaped.

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