Atmosphere protection rotary furnace

Abstract

The utility model relates to the technical field of rotary furnaces, in particular to an atmosphere protection rotary furnace which comprises a furnace frame and a protective shell fixedly arranged on the furnace frame, a base is fixedly arranged in the protective shell, and a spiral coil used for exhausting internal high-temperature gas is arranged on the surface of a furnace body. A heat exchange mechanism used for heating external reducing gas is arranged on one side of the furnace body, the spiral coil is spirally fixed to the surface close to an outlet of the furnace body, a first exhaust channel communicated with the spiral coil is formed in the inner wall of the outlet of the furnace body, and a second exhaust channel is formed in the outer wall of the other end of the furnace body. The high-temperature waste gas is used for preserving heat of the furnace body, and meanwhile, the high-temperature waste gas can be used for heating the reducing gas fed into the large furnace body, so that the problem that the temperature in the furnace is reduced due to the fact that the low-temperature reducing gas is directly fed into the furnace body is avoided, and materials in the furnace body are always in a good heating reaction atmosphere; the material heating reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to an atmosphere protection rotary kiln. Background Art

[0002] The rotary kiln is a thermal equipment for calcining, roasting or drying granular and powdered materials. The movement state of the materials in the furnace is dynamic movement and turning, and the heating is uniform, ensuring the full reaction of the materials.

[0003] The chemical reaction in the rotary kiln requires specific atmospheric conditions to proceed normally, such as high temperature, high pressure, reducing atmosphere, etc. Protecting the atmosphere in the furnace can provide a suitable reaction environment and improve reaction efficiency and yield. In order to prevent external oxygen from entering the rotary kiln and causing oxidation of the metal materials inside, the existing rotary kiln needs to continuously introduce reducing gas into the furnace and discharge the gas generated by heating the materials to keep the atmosphere balance in the furnace at all times, so that the materials in the furnace are always in a state of efficient conversion. However, this method will not only bring out heat during the continuous exhaust process, causing a certain amount of heat loss, but the low-temperature reducing gas that enters the furnace to maintain the atmosphere will also absorb heat, further causing the temperature in the furnace to drop, which is not conducive to the efficient heating reaction of the materials in the rotary kiln. Therefore, an atmosphere-protected rotary kiln is urgently needed. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an atmosphere-protected rotary kiln, comprising a furnace frame, a protective shell fixedly arranged on the furnace frame, a base fixedly arranged inside the protective shell, a spiral coil for discharging the internal high-temperature gas is arranged on the surface of the furnace body, and a heat exchange mechanism for heating the external reducing gas is arranged on one side of the furnace body.

[0005] Preferably, the spiral coil is spirally fixed on the surface close to the furnace body outlet, an exhaust channel 1 connected to the spiral coil is opened on the inner wall of the furnace body outlet, and an exhaust channel 2 is opened inside the outer wall at the other end of the furnace body.

[0006] Preferably, the heat exchange mechanism includes a transfer shell fixedly arranged on one side of the furnace body for transferring exhaust gas, a connecting pipe is arranged between the upper part of the transfer shell and the two ports of the exhaust channel, a spiral heat exchange tube for transporting and heating reducing gas is arranged in the transfer shell, one end of the spiral heat exchange tube is connected to the interior of the furnace body, and the other end of the spiral heat exchange tube is connected to a gas transmission unit for delivering the reducing gas into the spiral heat exchange tube, and a filter for purification during discharge is also arranged on one side of the transfer shell.

[0007] Preferably, the gas delivery unit includes a mounting seat fixedly arranged on the base, an air pump is arranged on the mounting seat, an air delivery pipe is arranged on the air pump, the air delivery pipe is fixedly arranged on the mounting seat, and one end of the air delivery pipe is rotatably connected to one end of the spiral heat exchange tube.

[0008] Preferably, the filter comprises an outer cylinder threadedly arranged on one side of the transfer shell, a primary filter plate and an activated carbon filter plate are sequentially arranged inside the outer cylinder, and a plurality of exhaust holes are opened on the other end surface of the outer cylinder.

[0009] Preferably, a sealing plate is rotatably provided at the inlet and outlet of the furnace body, and two blocking bars for limiting the sealing plate are movably provided on the inlet and outlet end surfaces of the furnace body.

[0010] Preferably, four supporting rollers are symmetrically arranged on the base, two annular rotating tracks are symmetrically fixedly arranged on the surface of the furnace body, the two supporting rollers on the same side are movably abutted against the corresponding rotating tracks, and a gear ring is also arranged on the surface of the furnace body, and a driving motor is arranged on the base, and a gear is connected to the output shaft of the driving motor, and the gear rotates in cooperation with the gear ring.

[0011] By means of the above technical solution, the utility model provides an atmosphere protection rotary kiln, which has at least the following beneficial effects:

[0012] 1. This kind of atmosphere protection rotary kiln has a spiral coil arranged on the outer wall of the furnace body, and the exhaust gas generated by heating the material in the furnace body is sent into the spiral coil through the exhaust channel. The spiral coil is attached to the surface of the furnace body, so that the high-temperature exhaust gas can heat the outer wall of the furnace body and reduce the heat loss of the furnace body itself.

[0013] 2. This kind of atmosphere protection rotary kiln is also equipped with a heat exchange mechanism on one side of the furnace body. While introducing reducing gas into the furnace body to maintain the atmosphere inside the furnace body, the reducing gas entering the furnace body is heated by exhaust gas, thereby avoiding the situation where the low-temperature reducing gas enters the furnace body and absorbs heat, causing the furnace body temperature to drop. This is beneficial to protecting the atmosphere inside the furnace body, thereby improving the efficiency of the high-temperature reaction of the material inside the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0015] In the attached picture:

[0016] Figure 1 This is a front view structural diagram of the utility model

[0017] Figure 2This is a schematic diagram of the external first-view structure of the furnace body in the utility model;

[0018] Figure 3 This is a schematic diagram of the external second viewing angle of the furnace body in the utility model;

[0019] Figure 4 It is a schematic diagram of the main cross-sectional structure of the furnace body in the utility model.

[0020] In the figure: 1. base; 2. furnace body; 3. spiral coil; 4. heat exchange mechanism; 401. transfer shell; 402. connecting pipe; 403. spiral heat exchange tube; 404. gas transmission unit; 4041. mounting base; 4042. air pump; 4043. gas transmission pipe; 405. filter; 5. exhaust channel 1; 6. exhaust channel 2; 7. sealing plate; 8. support roller; 9. rotating track; 10. gear ring; 11. driving motor; 12. gear; 13. furnace frame; 14. protective shell. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Combination Figure 1-Figure 4 As shown, the utility model provides: when processing metal minerals (such as iron materials), an atmosphere-protected rotary furnace is required, wherein a furnace frame 13 carrying the entire rotary furnace is provided, the bottom of the furnace frame 13 is provided with moving wheels, a protective shell 14 is provided on the furnace frame 13, (the protective shell 14 and the furnace frame 13 can cooperate with a tilting mechanism to assist the furnace body 2 to tilt, and the specific structure is not described in detail in this scheme) a base 1 is welded inside the protective shell, a furnace body 2 is installed on the base 1, the furnace body diameter is 2-3m, the inlet and outlet diameters are about 1m, and a spiral coil 3 is welded on the surface of the furnace body 2 The spiral coil 3 can discharge the high-temperature exhaust gas generated inside the furnace body 2. Since the spiral coil 3 is wound on the surface of the furnace body 2, the high-temperature gas will still flow on the outer surface of the furnace body 2 after being discharged, which can heat the outer surface of the furnace body 2 while hindering the heat dissipation of the furnace body 2 itself, playing a certain role in heat preservation. A heat exchange mechanism 4 for heating the external reducing gas is installed on one side of the furnace body 2. The heat exchange mechanism 4 uses the high-temperature exhaust gas to heat the reducing gas introduced into the furnace body 2, thereby reusing the exhaust gas heat, which is beneficial to protecting the atmosphere inside the furnace body 2, thereby improving the efficiency of the high-temperature reaction of the material inside the furnace body 2;

[0023] The spiral coil 3 is welded in a spiral shape on the surface near the outlet of the furnace body 2. An exhaust channel 1 5 connected to the spiral coil 3 is opened on the inner wall of the inlet and outlet of the furnace body 2, which can send the exhaust gas in the furnace body 2 into the spiral coil 3 and slowly transport it along the spiral coil 3. An exhaust channel 2 6 is opened inside the outer wall of the other end of the furnace body 2. The heat exchange mechanism 4 includes a transfer shell 401 welded on one side of the furnace body 2 for transferring the exhaust gas. A connecting pipe 402 is installed between the upper part of the transfer shell 401 and the port of the exhaust channel 2 6. The exhaust gas is sent into the transfer shell 401 through the connecting pipe 402. 1, a filter 405 is installed on one side of the transfer shell 401 to filter out impurities in the exhaust gas and discharge them. At the same time, a spiral heat exchange tube 403 for transporting and heating the reducing gas is installed in the transfer shell 401. The spiral arrangement can make the heat exchange path of the reducing gas longer and can be fully heated by the exhaust gas. One end of the spiral heat exchange tube 403 is connected to the inside of the furnace body 2 to send the reducing gas into the furnace body 2 to maintain the atmosphere in the furnace body 2, and the other end of the spiral heat exchange tube 403 is connected to a gas transmission unit 404 for sending the reducing gas into the spiral heat exchange tube 403;

[0024] The gas delivery unit 404 includes a mounting base 4041 welded on the base 1, an air pump 4042 is welded on the mounting base 4041, the air pump 4042 is externally connected to a reducing gas supply device, a gas delivery pipe 4043 is installed on the air pump 4042, the gas delivery pipe 4043 is welded on the mounting base 4041, and one end of the gas delivery pipe 4043 is rotatably connected to one end of the spiral heat exchange tube 403, a mounting hole is opened on one side of the transfer shell 401, the spiral heat exchange tube 403 is welded in the mounting hole, and one end of the gas delivery pipe 4043 is movably plugged into the mounting hole, and a high temperature resistant sealing ring is set at the connection to deliver the reducing gas into the furnace body 2;

[0025] The filter 405 includes an outer cylinder threadedly mounted on one side of the transfer shell 401, and a sealing gasket is provided at the connection to maintain sealing and facilitate disassembly and assembly. A primary filter plate and an activated carbon filter plate are sequentially installed inside the outer cylinder to filter impurities, and a plurality of exhaust holes are opened on the other end surface of the outer cylinder for filtering and discharging exhaust gas;

[0026] A sealing plate 7 is rotatably installed at the inlet and outlet of the furnace body 2, and two stop bars for limiting the sealing plate 7 are movably installed on the inlet and outlet end surfaces of the furnace body 2 to seal the furnace body 2 during operation to prevent external air from entering and contaminating the internal materials;

[0027] Four supporting rollers 8 are symmetrically installed on the base 1, and the four supporting rollers 8 can rotate on the surface of the furnace body 2. Two annular rotating tracks 9 are symmetrically welded on the surface of the furnace body 2. The two supporting rollers 8 on the same side are movably abutted against the corresponding rotating tracks 9, so that the furnace body 2 is easy to rotate, and a gear ring 10 is also welded on the surface of the furnace body 2. A driving motor 11 is installed on the base 1, and a gear 12 is connected to the output shaft of the driving motor 11. The gear 12 rotates with the gear ring 10 to drive the furnace body 2 to rotate.

[0028] In this scheme, during the heating process of the material in the furnace body 2, the high-temperature exhaust gas generated enters the spiral coil 3 through the exhaust channel 1 5. The coiled spiral coil 3 surrounds the surface of the furnace body 2 with the internal high-temperature gas, heats the surface of the furnace body 2, and reduces the heat loss of the furnace body 2 itself. The exhaust gas is transported along the spiral coil 3 until it is sent into the transfer shell 401 through the exhaust channel 2 6. The transfer shell 401 is equipped with a spiral heat exchange tube 403. The reducing gas in the spiral heat exchange tube 403 is heated by the high-temperature exhaust gas in the transfer shell 401 and then sent into the furnace body 2 to maintain the atmosphere balance in the furnace body 2. The high-temperature exhaust gas is used to keep the furnace body 2 warm. At the same time, the high-temperature exhaust gas can also be used to heat the reducing gas sent into the large furnace body 2, avoiding the problem of low-temperature reducing gas being directly sent into the furnace body 2 to cause the temperature in the furnace to drop, so that the material inside the furnace body 2 is always in a good heating reaction atmosphere, thereby improving the heating reaction efficiency of the material.

[0029] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0030] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An atmosphere protection rotary kiln, comprising a furnace frame (13), a protective shell (14) fixedly arranged on the furnace frame, a base (1) fixedly arranged inside the protective shell (14), a furnace body (2) arranged on the base (1), Features: The surface of the furnace body (2) is provided with a spiral coil (3) for discharging internal high-temperature gas, and one side of the furnace body (2) is provided with a heat exchange mechanism (4) for heating external reducing gas.

2. The atmosphere protection rotary kiln according to claim 1, Features: The spiral coil (3) is fixed in a spiral shape on a surface close to the outlet of the furnace body (2); an exhaust channel (5) communicating with the spiral coil (3) is provided on the inner wall of the outlet of the furnace body (2); and an exhaust channel (6) is provided inside the outer wall at the other end of the furnace body (2).

3. The atmosphere protection rotary kiln according to claim 2, Features: The heat exchange mechanism (4) comprises a transfer shell (401) fixedly arranged on one side of the furnace body (2) for transferring exhaust gas, a connecting pipe (402) is arranged between the upper part of the transfer shell (401) and the second (6) port of the exhaust channel, a spiral heat exchange tube (403) for transporting and heating reducing gas is arranged in the transfer shell (401), one end of the spiral heat exchange tube (403) is connected to the interior of the furnace body (2), and the other end of the spiral heat exchange tube (403) is connected to a gas transmission unit (404) for transporting reducing gas into the spiral heat exchange tube (403), and a filter (405) for purifying during discharge is also arranged on one side of the transfer shell (401).

4. The atmosphere protection rotary kiln according to claim 3, Features: The gas delivery unit (404) comprises a mounting seat (4041) fixedly arranged on the base (1); an air pump (4042) is arranged on the mounting seat (4041); an air delivery pipe (4043) is arranged on the air pump (4042); the air delivery pipe (4043) is fixedly arranged on the mounting seat (4041), and one end of the air delivery pipe (4043) is rotatably connected to one end of the spiral heat exchange pipe (403).

5. The atmosphere protection rotary kiln according to claim 4, Features: The filter (405) comprises an outer cylinder threadedly arranged on one side of the transfer shell (401), a primary filter plate and an activated carbon filter plate are arranged in sequence inside the outer cylinder, and a plurality of exhaust holes are opened on the other end surface of the outer cylinder.

6. The atmosphere protection rotary kiln according to claim 1, Features: A sealing plate (7) is rotatably provided at the inlet and outlet of the furnace body (2), and two retaining bars for limiting the position of the sealing plate (7) are movably provided on the inlet and outlet end surfaces of the furnace body (2).

7. The atmosphere protection rotary kiln according to claim 1, Features: Four supporting rollers (8) are symmetrically arranged on the base (1); two annular rotating tracks (9) are symmetrically fixedly arranged on the surface of the furnace body (2); two supporting rollers (8) on the same side are movably abutted against the corresponding rotating tracks (9); and a gear ring (10) is also arranged on the surface of the furnace body (2); a driving motor (11) is arranged on the base (1); a gear (12) is connected to the output shaft of the driving motor (11); and the gear (12) and the gear ring (10) are rotatably matched.

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