Energy-saving powder spheroidizing furnace

Abstract

The application provides an energy-saving powder spheroidizing furnace, and relates to the technical field of powder spheroidizing equipment. The energy-saving powder spheroidizing furnace comprises a furnace body, a powder conveying pipe, an inner layer oxygen conveying pipe, a fuel gas conveying pipe, an outer layer oxygen conveying pipe, an exhaust gas recovery pipe, a heat exchanger and a cyclone guide pipe. The flow of the exhaust gas waste heat recovery pipe flows through the heat exchanger as a heat source to preheat the powder, the inner layer oxygen, the fuel gas and the outer layer oxygen. The cyclone guide pipe enables part of the airflow in the exhaust gas recovery pipe to enter the furnace body in a tangential direction of the inner wall of the furnace body, thereby forming a wind field that flows upwards in a spiral shape in the furnace body. The exhaust gas recovery pipe can be communicated with an exhaust fan for discharging exhaust gas, so as to recover exhaust gas with a temperature of up to 200 DEG C and lead the exhaust gas to the heat exchanger as a heat source to preheat the powder, the inner layer oxygen, the fuel gas and the outer layer oxygen, thereby reducing the consumption of oxygen required for fuel gas combustion.

Description

Technical Field

[0001] This invention relates to the field of powder spheroidizing equipment technology, and in particular to an energy-saving powder spheroidizing furnace. Background Technology

[0002] The powder spheroidizing furnace includes a furnace body, with a rectangular or spindle-shaped upper part and an inverted triangular lower part. The upper part of the furnace body is equipped with a feed inlet and a combustion zone connected to an external burner to melt the powder material into a liquid state. The liquid material cools and spheroidizes during its descent. The lower part of the furnace body is equipped with a spheroidized product outlet and an air inlet. The spheroidized product outlet is used to discharge the spheroidized powder, and the air inlet can be used to supply cooling air to the lower part of the furnace body to assist in the cooling of the spheroidized powder. The powder spheroidizing furnace also includes an exhaust fan to discharge the high-temperature exhaust gas from the powder spheroidizing furnace.

[0003] The temperature of the high-temperature exhaust gas discharged by the exhaust fan can reach 200℃. The high-temperature exhaust gas still has a lot of residual heat. However, most of the high-temperature exhaust gas from the current powder spheroidizing furnace is directly discharged without utilizing the residual heat of the high-temperature exhaust gas. Summary of the Invention

[0004] In view of the above situation, the present invention provides an energy-saving powder spheroidizing furnace, which aims to solve the technical problem that most of the high-temperature exhaust gas of existing powder spheroidizing furnaces is directly emitted without utilizing the waste heat of the high-temperature exhaust gas.

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

[0006] This invention provides an energy-saving powder spheroidizing furnace, comprising a furnace body, with a feed inlet at the top and a spheroidized product outlet at the bottom; and further comprising:

[0007] Powder conveying pipe, used to convey powder to the feed inlet;

[0008] The inner oxygen delivery pipe is used to deliver inner oxygen to the feed inlet;

[0009] Gas delivery pipe, used to deliver gas to the feed inlet;

[0010] The outer oxygen delivery pipe is used to deliver outer oxygen to the feed inlet;

[0011] The exhaust gas recovery pipe is used to recover the exhaust gas from the furnace.

[0012] Heat exchangers; and

[0013] If there is a cyclone inlet pipe, one end of which is connected to the exhaust gas recovery pipe and the other end is connected to the furnace body;

[0014] in:

[0015] The streams of the powder conveying pipe, the inner oxygen conveying pipe, the fuel gas conveying pipe, and the outer oxygen conveying pipe all flow through the heat exchanger; the stream of the exhaust gas waste heat recovery pipe flows through the heat exchanger as a heat source to preheat the powder, the inner oxygen, the fuel gas, and the outer oxygen.

[0016] The cyclone inlet pipe allows part of the airflow in the exhaust gas recovery pipe to enter the furnace body tangentially along the inner wall of the furnace body, thereby forming a spiral upward airflow field inside the furnace body.

[0017] In some embodiments of the present invention, multiple cyclone inlet pipes are arranged around the furnace body.

[0018] In some embodiments of the present invention, an air inlet is provided at the bottom of the furnace body.

[0019] In some embodiments of the present invention, the air intake is connected to a gas purification mechanism.

[0020] In some embodiments of the present invention, the energy-saving powder spheroidizing furnace further includes a powder dispersion mechanism, through which the powder enters the powder conveying pipe.

[0021] In some embodiments of the present invention, the powder dispersion mechanism includes a housing, with a feed inlet and a first air inlet on opposite sides of the housing, a second air inlet at the bottom, and a discharge outlet communicating with a powder conveying pipe at the top.

[0022] In some embodiments of the present invention, the powder dispersion mechanism includes:

[0023] shell;

[0024] The powder inlet is located on the side of the outer shell, through which compressed gas can deliver powder into the outer shell;

[0025] The discharge port is located at the top of the outer casing and is connected to the powder conveying pipe;

[0026] The compressed air inlet is located at the bottom of the casing;

[0027] The support shaft is rotatably mounted inside the housing;

[0028] Impact plate, vertically positioned and extending radially along the support axis; and

[0029] Drive component, used to drive the support shaft to rotate;

[0030] The powder enters the outer shell through the powder inlet and collides with the impact plate.

[0031] In some embodiments of the present invention, the driving component includes:

[0032] The drive shaft is connected to the support shaft for transmission; and

[0033] The drive blade is fixed to the drive shaft and positioned near the compressed air inlet;

[0034] The air pressure inside the compressed air inlet is higher than the air pressure inside the powder inlet.

[0035] In some embodiments of the present invention, the support shaft is tubular, the drive shaft is fixed inside the support shaft by a connector, and the upper end of the support shaft is connected to an exhaust pipe.

[0036] The drive assembly also includes a gas splitting assembly. After the compressed gas from the compressed gas inlet drives the drive blade to rotate, it can be split into two streams by the gas splitting assembly. One stream of compressed gas can flow between the housing and the support shaft, and the other stream of compressed gas can enter the interior of the support shaft.

[0037] One end of the exhaust pipe extends outside the outer casing and can communicate with the powder inlet.

[0038] In some embodiments of the present invention, the gas splitting assembly includes:

[0039] The first partition is fixed inside the outer casing, and air guide holes are provided on the first partition; the lower part of the support shaft is rotatably connected to the outer casing.

[0040] The second partition is fixed inside the housing and located between the first partition and the compressed air inlet;

[0041] An outer tube, one end of which is fixed to the lower side of the first partition and connected to the compressed air inlet, and the other end of which passes through the second partition; and

[0042] The inner tube has one end fixed to the lower side of the first partition and is connected to the support shaft;

[0043] The inner tube is located inside the outer tube, and there is a gap between the outer wall of the inner tube and the inner wall of the outer tube; the drive blade is located below the inner tube.

[0044] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0045] 1. The exhaust gas recovery pipe can be connected to the exhaust fan used to discharge exhaust gas to recover exhaust gas with a temperature of up to 200°C, and use the exhaust gas as a heat source to pass to the heat exchanger to preheat the powder, inner oxygen, fuel gas and outer oxygen, thereby reducing the amount of oxygen consumed for fuel gas combustion.

[0046] 2. Using the waste heat of exhaust gas to preheat the powder also helps to improve the spheroidization effect of the powder.

[0047] 3. The cyclone inlet pipe allows part of the airflow in the tail gas recovery pipe to enter the furnace body along the tangential direction of the inner wall of the furnace body, thereby forming a spiral upward airflow field in the furnace body. This causes the spheroidized powder to fall along a spiral path, prolonging the falling time of the spheroidized powder and increasing the time for the spheroidized powder to transform into the α-phase during the falling process.

[0048] 4. Since the exhaust gas introduced into the furnace through the cyclone inlet pipe carries residual heat, it can reduce the impact on the furnace temperature inside the furnace.

[0049] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of an energy-saving powder spheroidizing furnace;

[0052] Figure 2 This is a schematic diagram of the powder dispersion mechanism provided in Example 1;

[0053] Figure 3 This is a schematic diagram of the powder dispersion mechanism provided in Example 2;

[0054] Figure 4 for Figure 3 A sectional view along direction AA.

[0055] icon:

[0056] 1-Furnace body, 11-Feed inlet, 12-Spheroidized product outlet, 13-Make-up air inlet, 14-Gas purification mechanism

[0057] 21-Powder conveying pipe, 22-Inner oxygen conveying pipe, 23-Gas conveying pipe, 24-Outer oxygen conveying pipe, 25-Emergency gas recovery pipe.

[0058] 3-Heat exchanger,

[0059] 4-Cyclone inlet pipe,

[0060] 5-Powder dispersion mechanism, 51-Shell, 52-Inlet, 53-First air inlet, 54-Second air inlet, 55-Outlet.

[0061] 6-Powder dispersion mechanism, 61-Outer shell, 611-Powder inlet, 612-Discharge port, 613-Compressed air inlet, 62-Support shaft, 621-Impact plate, 631-Drive shaft, 632-Drive blade, 633-Connector, 634-Exhaust pipe, 635-First partition, 636-Second partition, 637-Outer pipe, 638-Inner pipe, 639-Air guide hole, 641-Gap. Detailed Implementation

[0062] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention.

[0063] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "counterclockwise", "radial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0066] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0067] Example 1

[0068] Please refer to Figures 1-2This embodiment provides an energy-saving powder spheroidizing furnace, which mainly includes: furnace body 1, powder conveying pipe 21, inner oxygen conveying pipe 22, gas conveying pipe 23, outer oxygen conveying pipe 24, tail gas recovery pipe 25, heat exchanger 3 and cyclone inlet pipe 4.

[0069] The upper part of the furnace body 1 has a feed inlet 11 and the lower part has a spheroidized product outlet 12. Powder enters the furnace body 1 through the feed inlet 11 and is discharged through the spheroidized product outlet 12 after spheroidization.

[0070] The powder conveying pipe 21 is used to convey powder to the feed inlet 11.

[0071] The inner oxygen delivery pipe 22 is used to deliver inner oxygen to the feed inlet 11.

[0072] The gas delivery pipe 23 is used to deliver natural gas or other fuel gas to the feed inlet 11.

[0073] The outer oxygen delivery pipe 24 is used to deliver outer oxygen to the feed inlet 11.

[0074] The exhaust gas recovery pipe 25 can be connected to an exhaust fan (not shown in the figure) used to discharge the exhaust gas of the furnace body 1 to recover the exhaust gas of the furnace body 1 at a temperature of up to 200°C.

[0075] There is at least one cyclone inlet pipe 4, one end of which is connected to the exhaust gas recovery pipe 25 and the other end is connected to the furnace body 1.

[0076] The streams of the powder conveying pipe 21, the inner oxygen conveying pipe 22, the fuel gas conveying pipe 23, and the outer oxygen conveying pipe 24 all flow through the heat exchanger 3; the stream of the exhaust gas waste heat recovery pipe flows through the heat exchanger 3 as a heat source to preheat the powder, the inner oxygen, the fuel gas, and the outer oxygen; the exhaust gas recovery pipe 25 can use the exhaust gas as a heat source to pass through the heat exchanger 3 to preheat the powder, the inner oxygen, the fuel gas, and the outer oxygen, thereby reducing the amount of oxygen consumed for fuel gas combustion.

[0077] The cyclone inlet pipe 4 allows a portion of the airflow from the exhaust gas recovery pipe 25 to enter the furnace body 1 tangentially along the inner wall of the furnace body 1, thereby forming a spiral upward airflow field within the furnace body 1. This causes the spheroidized powder to fall along a spiral path, prolonging the falling time of the spheroidized powder and increasing the time for the spheroidized powder to transform into the α-phase during its fall. Furthermore, since the exhaust gas introduced into the furnace body 1 by the cyclone inlet pipe 4 carries residual heat, it can reduce the impact on the furnace temperature within the furnace body 1.

[0078] The above text has given a general description of the main components and working principle of the energy-saving powder spheroidizing furnace. The following text will provide a more detailed explanation of the energy-saving powder spheroidizing furnace.

[0079] In this embodiment, in order to better form a spiral upward airflow field inside the furnace body 1, preferably, multiple cyclone inlet pipes 4 are arranged around the furnace body 1.

[0080] Similar to existing technologies, in this embodiment, the lower part of the furnace body 1 may also be provided with an air inlet 13 to facilitate the introduction of cooling airflow into the lower part of the furnace body 1 to assist in the cooling of the spheroidized powder.

[0081] The air intake 13 can be connected to a gas purification mechanism 14 to purify the airflow passing through the air intake 13.

[0082] The energy-saving powder spheroidizing furnace may also include a powder dispersion mechanism 5. After passing through the powder dispersion mechanism 5, the powder enters the powder conveying pipe 21 to break up the powder agglomerates and disperse the agglomerated powder into single particles, so as to avoid the uncontrollable or uneven particle size of the spheroidized powder due to agglomeration and adhesion after the powder melts.

[0083] Specifically, in this embodiment, the powder dispersion mechanism 5 mainly includes a housing 51. The housing 51 has a feed inlet 52 on the left side, a first air inlet 53 on the right side, a second air inlet 54 at the bottom, and a discharge outlet 55 at the top that communicates with the powder conveying pipe 21. Powder can enter the housing 51 through the feed inlet 52 under the conveying of compressed gas. Compressed gas is introduced into both the first air inlet 53 and the second air inlet 54. The powder dispersion mechanism 5 uses the airflow counter-current method to break up the powder agglomerates and disperse the agglomerated powder into single particles.

[0084] Example 2

[0085] This embodiment is another implementation of the powder dispersion mechanism 6 (in order to distinguish it from Embodiment 1, the powder dispersion mechanism is referred to as 6 in this embodiment).

[0086] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments of the present invention, the powder dispersion mechanism 6 may mainly include: a shell 61, a powder inlet 611, a discharge port 612, a compressed air inlet 613, a support shaft 62, an impact plate 621, and a drive assembly.

[0087] The powder inlet 611 is located on the side of the housing 61, and compressed gas can be used to send powder into the housing 61 through the powder inlet 611.

[0088] The discharge port 612 is located at the top of the outer shell 61 and is connected to the powder conveying pipe 21 to send the dispersed powder into the furnace body 1.

[0089] The compressed gas inlet 613 is located at the bottom of the housing 61, through which compressed gas can be introduced into the housing 61.

[0090] The support shaft 62 is rotatably disposed within the housing 61.

[0091] The impact plate 621 is vertically arranged and extends radially along the support shaft 62.

[0092] The drive assembly is used to drive the support shaft 62 to rotate.

[0093] The drive component can drive the impact plate 621 to rotate rapidly. After the powder enters the shell 61 through the powder inlet 611, the powder can collide with the impact plate 621 to break up the powder agglomeration and disperse the agglomerated powder into single particles. This avoids the uncontrollable or uneven particle size of the spheroidized powder due to the powder agglomerating and sticking together after melting.

[0094] Specifically, the drive assembly mainly includes a drive shaft 631 and a drive vane 632. The drive shaft 631 is connected to the support shaft 62. The drive vane 632 is fixed to the drive shaft 631 and is located near the compressed gas inlet 613. The compressed gas entering the housing 61 through the compressed gas inlet 613 can drive the drive shaft 631 and the support shaft 62 to rotate rapidly counterclockwise via the drive vane 632. Figure 4 (As shown, counterclockwise direction).

[0095] To avoid excessive obstruction to the rotation of the support shaft 62 due to the impact of the impact plate 621 and the powder, the air pressure in the compressed air inlet 613 is higher than the air pressure in the powder inlet 611.

[0096] To ensure that the air pressure in the compressed air inlet 613 is higher than that in the powder inlet 611, in this embodiment, preferably: the support shaft 62 is tubular, the drive shaft 631 is fixed inside the support shaft 62 by a connector 633, the upper end of the support shaft 62 is connected to an exhaust pipe 634, one end of the exhaust pipe 634 extends outside the housing 61 and can communicate with the powder inlet 611; the drive assembly may also include a gas diversion assembly, so that the compressed gas from the compressed air inlet 613, after driving the drive blade 632 to rotate, can be diverted by the gas... The flow divider splits the gas into two streams. One stream of compressed gas can flow between the outer casing 61 and the support shaft 62, while the other stream of compressed gas can enter the interior of the support shaft 62. That is, the compressed gas in the compressed gas inlet 613 and the powder inlet 611 can use the same gas source. After the compressed gas in the compressed gas inlet 613 drives the drive blade 632 to rotate, part of the compressed gas in the compressed gas inlet 613 can be passed through the support shaft 62 and the exhaust pipe 634 to the powder inlet 611, so as to send the powder into the outer casing 61 through the powder inlet 611.

[0097] Specifically, the gas splitting assembly mainly includes: a first partition 635, a second partition 636, an outer tube 637, and an inner tube 638; the first partition 635 is fixed inside the outer casing 61, and a gas guide hole 639 is provided on the first partition 635; the lower part of the support shaft 62 is rotatably connected to the outer casing 61; the second partition 636 is fixed inside the outer casing 61 and is located between the first partition 635 and the compressed gas inlet 613; one end of the outer tube 637 is fixed to the lower side of the first partition 635 and communicates with the compressed gas inlet 613, and the other end passes through the second partition 636; one end of the inner tube 638 is fixed to the lower side of the first partition 635 and communicates with the support shaft 62; the inner tube 638 is located inside the outer tube 637, and a gap 641 is left between the outer wall of the inner tube 638 and the inner wall of the outer tube 637; the drive blade 632 is located below the inner tube 638.

[0098] After the compressed gas in the compressed gas inlet 613 enters the outer tube 637, it can first drive the drive blade 632 to rotate, and then split into two streams. One stream flows through the gap 641 and the air guide hole 639 in sequence, and then enters the upper part of the outer shell 61 to blow the powder dispersed by collision to the discharge port 612. The other stream flows through the inner tube 638, the support shaft 62 and the exhaust pipe 634 in sequence, and then flows to the powder inlet 611. In this way, the air pressure in the compressed gas inlet 613 is higher than the air pressure in the powder inlet 611.

[0099] It should be noted that the function of the drive assembly is to make the support shaft 62 and the impact plate 621 rotate rapidly. The drive assembly described above is only a preferred embodiment. Other structures can also be used for the drive assembly, as long as they can achieve the above purpose. This embodiment will not list them one by one.

[0100] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving powder spheroidizing furnace, comprising a furnace body, wherein the upper part of the furnace body has a feed inlet and the lower part has a spheroidized product discharge outlet, characterized in that, Also includes: A powder conveying pipe is used to convey powder into the feed inlet; An inner oxygen delivery pipe is used to deliver inner oxygen to the feed inlet; A gas delivery pipe is used to deliver gas to the feed inlet; An outer oxygen delivery pipe is used to deliver outer oxygen to the feed inlet; A tail gas recovery pipe is used to recover the tail gas from the furnace body; Heat exchangers; and If there is a cyclone inlet pipe, one end of which is connected to the exhaust gas recovery pipe and the other end is connected to the furnace body; in: The streams of the powder conveying pipe, the inner oxygen conveying pipe, the fuel gas conveying pipe, and the outer oxygen conveying pipe all flow through the heat exchanger; the stream of the exhaust gas waste heat recovery pipe flows through the heat exchanger as a heat source to preheat the powder, the inner oxygen, the fuel gas, and the outer oxygen. The cyclone inlet pipe allows part of the airflow in the exhaust gas recovery pipe to enter the furnace body along the tangential direction of the inner wall of the furnace body, thereby forming a spiral upward airflow field in the furnace body. The energy-saving powder spheroidizing furnace also includes a powder dispersion mechanism, through which the powder enters the powder conveying pipe; The powder dispersion mechanism includes: shell; A powder inlet is located on the side of the outer casing, through which compressed gas can deliver powder into the outer casing; The discharge port is located at the top of the outer shell and is connected to the powder conveying pipe; A compressed air inlet is located at the bottom of the outer casing; A support shaft is rotatably disposed within the housing; Impact plate, vertically arranged and extending radially along the support axis; and A drive component for driving the support shaft to rotate; The powder enters the outer shell through the powder inlet and is able to collide with the impact plate. The driving component includes: The drive shaft is connected to the support shaft for transmission; and The drive blade is fixed to the drive shaft and positioned near the compressed air inlet; Wherein, the air pressure in the compressed air inlet is higher than the air pressure in the powder inlet; The support shaft is tubular, and the drive shaft is fixed inside the support shaft by a connector. An exhaust pipe is connected to the upper end of the support shaft. The drive assembly also includes a gas splitting assembly. After the compressed gas from the compressed gas inlet drives the drive blade to rotate, the compressed gas can be split into two streams by the gas splitting assembly. One stream of compressed gas can flow between the outer shell and the support shaft, and the other stream of compressed gas can enter the interior of the support shaft. One end of the exhaust pipe extends outside the outer casing and is connected to the powder inlet.

2. The energy-saving powder spheroidizing furnace according to claim 1, characterized in that, Multiple cyclone inlet pipes are arranged around the furnace body.

3. The energy-saving powder spheroidizing furnace according to claim 1, characterized in that, The lower part of the furnace body is provided with an air inlet.

4. The energy-saving powder spheroidizing furnace according to claim 3, characterized in that, The air supply inlet is connected to a gas purification mechanism.

5. The energy-saving powder spheroidizing furnace according to claim 1, characterized in that, The gas splitting assembly includes: The first partition is fixed inside the outer casing, and the first partition has air guide holes; the lower part of the support shaft is rotatably connected to the outer casing. The second partition is fixed inside the outer casing and located between the first partition and the compressed air inlet; An outer tube, one end of which is fixed to the lower side of the first partition and communicates with the compressed air inlet, and the other end of which passes through the second partition; and The inner tube has one end fixed to the lower side of the first partition and is connected to the support shaft; The inner tube is located inside the outer tube, and there is a gap between the outer wall of the inner tube and the inner wall of the outer tube; the drive blade is located below the inner tube.

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