Spheroidizing furnace capable of utilizing exhaust heat

Abstract

The application relates to the technical field of spheroidizing furnaces, in particular to a spheroidizing furnace capable of utilizing tail gas heat, which comprises a bearing seat, a furnace body is assembled on the bearing seat, a furnace cover is covered on the furnace body, a feeding door for feeding is arranged on the furnace cover, an observation window for observing the spheroidizing degree of a workpiece is arranged on the furnace cover, and a waste heat utilization device is arranged on the outer surface of the furnace body to recycle and utilize the waste heat in tail gas in the spheroidizing furnace. The pump body in the waste heat utilization device absorbs high-temperature tail gas in the furnace body through a pipeline, then the high-temperature tail gas is introduced into spiral heat preservation pipes surrounding the furnace wall interlayer, the high-temperature tail gas releases heat in the heat preservation pipes to preserve the furnace wall interlayer, the temperature in the furnace body is maintained stable, a large amount of energy is not consumed additionally to supplement heat, the equipment operation energy consumption is remarkably reduced, and the waste heat of the tail gas of the existing spheroidizing furnace is effectively solved.

Description

Technical Field

[0001] This application relates to the field of spheroidizing furnace technology, and more particularly to a spheroidizing furnace that can utilize the heat of exhaust gas. Background Technology

[0002] In the field of spheroidizing furnace technology, the spheroidizing furnace is a key piece of equipment in the spheroidizing process of workpieces. It generates a high-temperature environment through gas combustion, so that the workpieces can complete the spheroidizing process inside the furnace.

[0003] There are still some problems that need to be solved in the actual operation of existing spheroidizing furnaces: during the processing of spheroidizing furnaces, a large amount of exhaust gas carrying high temperature heat is generated. Existing technologies usually directly discharge these exhaust gases to the outside, which not only wastes a lot of residual heat in the exhaust gas and cannot be effectively recovered and utilized, but also requires additional energy to maintain the processing temperature inside the furnace, which significantly increases the energy consumption of the equipment. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of the prior art by proposing a spheroidizing furnace that can utilize the heat of exhaust gas.

[0005] To achieve the above objectives, this application adopts the following technical solution: a spheroidizing furnace that can utilize the heat of exhaust gas, comprising a support base, a furnace body mounted on the support base, a furnace cover covering the furnace body, a feeding door for feeding material on the furnace cover, an observation window for observing the degree of spheroidization of the workpiece on the furnace cover, a waste heat utilization device on the outer surface of the furnace body for recovering and utilizing the waste heat in the exhaust gas inside the spheroidizing furnace, and a control panel on the top of the support base.

[0006] Preferably, the waste heat recovery device includes a pump body installed on a support base. The pump body is provided with an air inlet and an air outlet. Solenoid valves are provided at both the air inlet and the air outlet. The pump body recovers and reuses exhaust gas through the air inlet and the air outlet connected to the pipeline assembly.

[0007] Preferably, the piping assembly includes a pipe communicating with the furnace cover and an insulation pipe surrounding the furnace wall partition in the furnace body. The end of the pipe away from the furnace cover is connected to the air inlet of the pump body. The insulation pipe is spirally wound inside the furnace wall partition of the furnace body. One end of the insulation pipe is connected to the air outlet of the pump body. When the pump body is started, the exhaust gas inside the spheroidizing furnace is absorbed into the air inlet through the pipe, and the high-temperature exhaust gas is introduced into the interior of the insulation pipe through the air outlet. The high-temperature exhaust gas insulates the furnace wall partition in the furnace body through the insulation pipe.

[0008] Preferably, the support is provided with a purification box for purifying the exhaust gas. The top of the purification box is connected to the end of the insulation pipe away from the air outlet of the pump body. The top of the purification box is provided with a filling port. The outer surface of the purification box is provided with a discharge pipe and a solenoid valve is provided on the discharge pipe.

[0009] Preferably, the furnace body is equipped with a gas connection pipe, a gas igniter is installed inside the furnace body, and a material loading assembly is installed inside the furnace body above the gas igniter to support the workpiece.

[0010] Preferably, the material carrier assembly includes a first substrate and a second substrate. The second substrate is placed above the gas igniter, and the first substrate is fixed to the second substrate by means of a plug rod inserted into a hole on the second substrate for supporting and placing the workpiece.

[0011] Preferably, a central cylinder is provided at the middle position of the second substrate, the central cylinder is connected to the gas connection pipe, and the top of the central cylinder is provided with several slots for engaging several arc-shaped support pieces.

[0012] Preferably, the inner wall of the central cylinder has an air outlet that communicates with the internal area of ​​the arc-shaped support plate. When combustion gas is input into the gas connection pipe, it is delivered to each arc-shaped support plate area through the air outlet of the central cylinder. When the gas igniter ignites the introduced gas, it can burn evenly in each arc-shaped support plate area, ensuring the uniformity of workpiece spheroidization.

[0013] In summary, the beneficial effects of this application are as follows: 1. In this application, by installing a waste heat utilization device outside the furnace body, the problem of waste heat from the tail gas of existing spheroidizing furnaces is effectively solved. The pump in the waste heat utilization device absorbs the high-temperature tail gas inside the furnace body through a pipeline, and then passes the high-temperature tail gas into a spiral insulation pipe surrounding the furnace wall partition. The high-temperature tail gas releases heat in the insulation pipe to insulate the furnace wall partition, keeping the temperature inside the furnace stable. There is no need to consume a large amount of additional energy to supplement the heat, which significantly reduces the energy consumption of the equipment operation, realizes the efficient recovery and reuse of tail gas waste heat, and improves the energy efficiency of the spheroidizing furnace.

[0014] 2. In this application, the material-carrying assembly inside the furnace adopts an insertion structure of a first substrate and a second substrate. The first substrate is fixed by interlocking with the insertion holes of the second substrate using a plug rod. Operators can flexibly adjust the installation position and number of layers of the first substrate according to the size and quantity of the workpieces to be processed. This not only meets diverse load-bearing requirements but also facilitates the removal of the first substrate along with the workpiece after processing, making operation convenient and effectively improving processing efficiency. The central cylinder in the middle of the second substrate is connected to the gas connection pipe, and the gas outlet on the inner wall of the central cylinder is connected to the arc-shaped support plate area. Gas can be evenly delivered to each arc-shaped support plate area through the gas outlet, and then ignited by the gas igniter to form a uniform flame. This structure makes the gas combustion more uniform, and the heat can be transferred to the workpiece surface from all directions, avoiding spheroidization quality problems caused by uneven heating of the workpiece in certain areas, significantly improving the spheroidization qualification rate and processing quality of the workpiece. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present application; Figure 2 For this application Figure 1 A schematic diagram of the three-dimensional structure below; Figure 3 This is a three-dimensional structural diagram of the mobile device of this application; Figure 4 For this application Figure 3 A partial internal three-dimensional structural diagram.

[0016] Legend: 1. Support base; 2. Control panel; 3. Furnace body; 4. Furnace cover; 5. Feed door; 6. Observation window; 7. Waste heat recovery device; 71. Pump body; 72. Air inlet; 73. Air outlet; 74. Pipe; 75. Insulation pipe; 76. Purification box; 761. Filling port; 762. Discharge pipe; 8. Material loading assembly; 81. Base plate 1; 82. Insert rod; 83. Base plate 2; 84. Insertion hole; 85. Central cylinder; 86. Air outlet; 87. Slot; 88. Arc-shaped support plate. Detailed Implementation

[0017] Reference Figure 1As shown, this application provides a technical solution: a spheroidizing furnace that can utilize the heat of exhaust gas. The support base 1 is made entirely of corrosion-resistant and high-temperature-resistant alloy metal material, and the bottom is evenly provided with several anti-slip rubber pads, which can effectively prevent the spheroidizing furnace from shifting due to vibration during operation. The furnace body 3 is stably mounted on the support base 1. The furnace body 3 is also made of high-temperature-resistant stainless steel to ensure that it is not easily deformed or damaged under long-term high-temperature environment. The furnace cover 4 is closed on the top of the furnace body 3. The edge of the furnace cover 4 in contact with the furnace body 3 is surrounded by a high-temperature-resistant sealing strip, which can greatly improve the sealing performance of the furnace body 3 and reduce the loss of internal heat to the outside. The furnace cover 4 has a feeding door 5 for feeding materials. The feeding door 5 is rotatably connected to the furnace cover 4 by a hinge, and the outside of the feeding door 5 is provided with a handle for easy opening and closing. The operator can smoothly put the workpiece to be spheroidized into the furnace body 3 by opening the feeding door 5. The furnace cover 4 is also equipped with an observation window 6 for observing the degree of spheroidization of the workpiece. The observation window 6 is made of high-transmittance, high-temperature resistant quartz glass, which can withstand the high temperature inside the furnace and allow the staff to clearly and in real time observe the spheroidization state of the workpiece inside the furnace body 3 and keep track of the processing progress.

[0018] The outer surface of the furnace body 3 is equipped with a waste heat recovery device 7, which is specifically designed to recover and reuse the waste heat contained in the exhaust gas inside the spheroidizing furnace, thereby reducing energy waste. A control panel 2 is fixedly installed on the top of the support base 1. The control panel 2 has clear operation buttons and a display screen. The display screen can show parameters such as furnace temperature, pump body 71 operating status, and gas flow rate in real time. Operators can precisely control various operating functions of the spheroidizing furnace through the operation buttons, such as controlling the start and stop of the waste heat recovery device 7, adjusting the gas supply flow rate, and setting the spheroidizing processing time.

[0019] The waste heat recovery device 7 includes a pump body 71 installed on one side of the support base 1. The pump body 71 is a high-temperature and wear-resistant centrifugal air pump, and its internal impeller is made of wear-resistant ceramic material to ensure that it is not prone to wear failure when transporting high-temperature exhaust gas for a long time. One end of the pump body 71 is provided with an air inlet 72, and the other end is provided with an air outlet 73. Solenoid valves are installed on the pipes of the air inlet 72 and the air outlet 73. The solenoid valves adopt an electromagnetic pilot structure, which has a fast response speed and good sealing performance, and can accurately control the airflow at the air inlet 72 and the air outlet 73, effectively preventing exhaust gas leakage when not in operation. The pump body 71 is connected to the pipe assembly through the air inlet 72 and the air outlet 73, respectively, thereby realizing the efficient recovery and reuse of exhaust gas in the furnace body 3.

[0020] The piping assembly consists of a pipe 74 communicating with the furnace cover 4 and an insulation pipe 75 encircling the furnace wall partition within the furnace body 3. The pipe 74 communicating with the furnace cover 4 is made of a high-temperature resistant alloy, and its inner wall is polished, resulting in a smooth and flat surface that reduces resistance to the flow of exhaust gas. The end of the pipe 74 furthest from the furnace cover 4 is sealed to the air inlet 72 of the pump body 71 via a flange. A high-temperature resistant sealing gasket is installed at the flange connection to prevent exhaust gas leakage, ensuring that the high-temperature exhaust gas generated within the furnace body 3 can smoothly and without loss enter the pump body 71. The insulation pipe 75 is also made of a high-temperature resistant metal pipe with good thermal conductivity. The insulation pipe 75 is spirally and tightly wound within the furnace wall partition of the furnace body 3. This spiral winding maximizes the contact area between the insulation pipe 75 and the furnace wall partition, allowing the heat released by the high-temperature exhaust gas to be more fully transferred to the furnace wall partition. One end of the insulation pipe 75 is fixedly connected to the air outlet 73 of the pump body 71 via a clamp, and the connection is also sealed. When pump 71 is started, the negative pressure generated by pump 71 draws the high-temperature exhaust gas from inside the spheroidizing furnace into the air inlet 72 through pipe 74 from the furnace cover 4. The high-temperature exhaust gas is then pressurized by pump 71 and transported to the interior of the insulation pipe 75 through the air outlet 73. As the high-temperature exhaust gas flows slowly within the insulation pipe 75, it continuously releases heat to the furnace wall partition, thus insulating the furnace body 3, maintaining the stability of the processing temperature within the furnace body 3, and reducing additional energy consumption.

[0021] A purification box 76 for purifying exhaust gas is fixedly installed on the support 1 near the pump body 71. The purification box 76 is made of corrosion-resistant fiberglass, and its internal capacity is designed according to the exhaust gas emission of the spheroidizing furnace to ensure that the exhaust gas has sufficient residence time to complete purification. The top of the purification box 76 is connected to the end of the insulation pipe 75 away from the air outlet 73 of the pump body 71 through a pipe. The exhaust gas, after being insulated and cooled, will enter the purification box 76 through this pipe. The top of the purification box 76 also has a filling port 761 with a threaded cap. The operator can add alkaline absorbent liquid into the purification box 76 by opening the threaded cap to neutralize the acidic harmful components in the exhaust gas. A filter screen is installed inside the filling port 761 to prevent impurities from being mixed in when adding absorbent liquid. A discharge pipe 762 is welded to the lower part of the outer surface of the purification box 76. The discharge pipe 762 is made of PVC and is equipped with a solenoid valve electrically connected to the control panel 2. After the exhaust gas has been purified in the purification chamber 76 for a sufficient period of time, the staff can control the solenoid valve to open through the control panel 2, so that the purified and qualified exhaust gas can be discharged from the discharge pipe 762. The end of the discharge pipe 762 can also be connected to an extension pipe as needed to guide the exhaust gas to the designated emission area.

[0022] A gas connection pipe, made of stainless steel, is welded to the lower side of one side of the furnace body 3. One end of the gas connection pipe connects to an external gas supply device, and the other end extends into the furnace body 3. A flow regulating valve, controlled by a control panel 2, is installed on the gas connection pipe. Operators can adjust the opening of the flow regulating valve via the control panel 2 to control the gas flow rate into the furnace body 3, thereby adjusting the combustion intensity. A gas igniter is fixedly installed inside the furnace body 3 near the outlet of the gas connection pipe. The gas igniter uses electronic ignition, and the ignition electrode is made of high-temperature resistant metal, ensuring a high ignition success rate. The gas igniter also integrates a flameout detection sensor. When an accidental flameout is detected, the flameout detection sensor immediately sends a signal to the control panel 2, which then controls the valve on the gas connection pipe to close, cutting off the gas supply and preventing gas leaks that could cause safety accidents. Inside the furnace body 3, above the gas igniter, is a material carrier assembly 8. This assembly is specifically designed to support the workpiece to be spheroidized, ensuring the workpiece remains within the high-temperature zone generated by gas combustion and guaranteeing the spheroidizing effect.

[0023] The material carrier assembly 8 includes a first substrate 81 and a second substrate 83. Both substrates 81 and 83 are made of high-temperature resistant ceramic material, which has good high-temperature resistance and thermal stability, and its smooth surface makes it less likely to stick to the workpiece. The second substrate 83 is fixedly placed above the gas igniter by a bracket made of metal, which is fixedly connected to the bottom of the furnace body 3 to ensure the stability of the second substrate 83. Several insertion rods 82 are vertically fixed to the bottom of the first substrate 81. The insertion rods 82 have a cylindrical structure, are rust-proofed, and their diameter matches the diameter of the insertion holes 84 on the second substrate 83. The second substrate 83 has multiple insertion holes 84 evenly distributed according to the workpiece placement requirements. The inner walls of the insertion holes 84 are polished smooth to facilitate the insertion and removal of the insertion rods 82. The operator can fix the first substrate 81 onto the second substrate 83 by inserting the insertion rods 82 into the corresponding insertion holes 84 on the second substrate 83, according to the size and quantity of the workpieces to be processed. If a large number of workpieces need to be processed, multiple No. 1 substrates 81 can be installed on the No. 2 substrate 83 to achieve multi-layer support and improve processing efficiency. At the same time, this plug-in structure also makes it easy to remove the No. 1 substrate 81 together with the workpiece after processing, making the operation convenient.

[0024] A central cylinder 85 is vertically fixed at the center of the second substrate 83. The central cylinder 85 is made of high-temperature resistant metal, and its bottom is sealed to one end of the gas connecting pipe extending into the furnace body 3, ensuring that the gas can smoothly enter the interior of the central cylinder 85. Several slots 87 are evenly distributed around the top of the central cylinder 85 along its circumference. The shape of the slots 87 matches the end shape of the arc-shaped support pieces 88, used to engage several arc-shaped support pieces 88. The arc-shaped support pieces 88 are made of thin, heat-resistant metal and have a certain degree of elasticity. Their ends can be tightly engaged in the slots 87, forming a stable support structure. The number of arc-shaped support pieces 88 is the same as the number of slots 87, and there is a uniform gap between adjacent arc-shaped support pieces 88. This does not affect the gas flow and provides auxiliary support to the first substrate 81 above, preventing the first substrate 81 from deforming due to excessive weight of the workpiece.

[0025] The inner wall of the central cylinder 85 is evenly provided with several sets of vent holes 86 along its height. The number of vent holes 86 in each set is the same as the number of arc-shaped support plates 88, and each vent hole 86 is connected to the internal area of ​​the corresponding arc-shaped support plate 88, ensuring that the gas can be accurately delivered to each arc-shaped support plate 88 area. When the gas connecting pipe introduces combustion gas into the central cylinder 85, the gas will be evenly distributed to each arc-shaped support plate 88 area through the vent holes 86 on the inner wall of the central cylinder 85. At this time, the gas igniter is activated, igniting the gas in each area simultaneously. The flame will burn evenly in the gaps between the arc-shaped support plates 88, and the heat generated can be transferred to the surface of the workpiece on the first substrate 81 in all directions, ensuring that all parts of the workpiece are heated evenly, effectively avoiding spheroidization quality problems caused by uneven local heating, and improving the spheroidization qualification rate of the workpiece.

[0026] Working principle: Before using the spheroidizing furnace, the operator first checks the condition of each component to ensure that the anti-slip pad at the bottom of the support seat 1 is placed stably, the sealing strip of the furnace cover 4 is undamaged, and sufficient alkaline absorbent liquid has been added to the purification box 76 through the filling port 761 and the threaded cap is tightened. Then, the main power of the equipment is turned on through the control panel 2, and the display screen lights up and displays the initial parameters.

[0027] Next, the workpiece placement operation is carried out. The staff opens the feed door 5 on the furnace cover 4 and, according to the size and quantity of the workpiece to be processed, inserts and fixes the No. 1 substrate 81 into the corresponding insertion hole 84 on the No. 2 substrate 83 through the bottom insertion rod 82. If there are many workpieces, multiple No. 1 substrates 81 are installed on the No. 2 substrate 83. Then, the workpiece to be spheroidized is placed stably on the No. 1 substrate 81. After placement, the feed door 5 is closed. The sealing strip on the edge of the feed door 5 ensures that the furnace body 3 is sealed.

[0028] The processing flow is then initiated via control panel 2. Control panel 2 first opens the valve on the gas connecting pipe and simultaneously adjusts the flow regulating valve to the set opening. External gas enters the central cylinder 85 through the gas connecting pipe and is then evenly distributed to each arc-shaped support plate 88 area through the gas outlet 86 on the inner wall of the central cylinder 85. Next, control panel 2 activates the gas igniter. The electronic ignition electrode generates a spark to ignite the gas in each arc-shaped support plate 88 area. The flame burns evenly in the gaps between the arc-shaped support plates 88, and the generated high-temperature heat is transferred to the workpiece surface through substrate 81, initiating spheroidization. During processing, operators can monitor the spheroidization status of the workpiece inside the furnace body 3 in real time through the high-temperature resistant quartz glass observation window 6 on the furnace cover 4. The display screen simultaneously shows parameters such as furnace temperature and gas flow rate, facilitating timely adjustments by the operators.

[0029] After the spheroidizing process generates exhaust gas, the control panel 2 automatically starts the pump 71 of the waste heat recovery device 7, and simultaneously opens the solenoid valves at the air inlet 72 and air outlet 73 of the pump 71. The negative pressure generated by the pump 71 draws the high-temperature exhaust gas from the furnace body 3 into the air inlet 72 through the high-temperature alloy pipe 74 from the furnace cover 4. After being pressurized by the pump 71, the exhaust gas is transported through the air outlet 73 to the insulation pipe 75 inside the furnace body 3 wall partition. The insulation pipe 75 is spirally wound and in full contact with the furnace wall partition. As the high-temperature exhaust gas flows slowly inside the insulation pipe 75, it continuously releases heat, heating and insulating the furnace body 3 wall partition, maintaining a stable processing temperature inside the furnace body 3, and reducing additional energy consumption.

[0030] After being insulated and cooled, the exhaust gas enters the purification chamber 76 through a pipe. The alkaline absorbent liquid inside the purification chamber 76 neutralizes the acidic and harmful components in the exhaust gas. Furthermore, the multi-layered filter plates inside the purification chamber 76 extend the residence time of the exhaust gas, ensuring thorough purification. When the control panel 2 detects that the residence time of the exhaust gas in the purification chamber 76 has reached the set value, it automatically opens the solenoid valve on the discharge pipe 762. The purified and compliant exhaust gas is then discharged through the discharge pipe 762, and an extension pipe at the end of the discharge pipe 762 can guide the exhaust gas to a designated area.

[0031] Throughout the processing, the flameout detection sensor on the gas igniter monitors the combustion status in real time. If an accidental flameout is detected, a signal is immediately sent to control panel 2. Control panel 2 then quickly closes the valve on the gas connection pipe, cutting off the gas supply and issuing an alarm. After processing is complete, the operator first shuts off the gas igniter and gas supply via control panel 2. Once the temperature inside the furnace 3 has dropped to a safe range, the feed door 5 is opened, and the first substrate 81, along with the processed workpiece, is removed. Subsequently, the solenoid valves on pump body 71 and the exhaust pipe 762 of purification chamber 76 are closed, completing one spheroidizing process.

Claims

1. A spheroidizing furnace that can utilize the heat of exhaust gas, comprising a support base (1), characterized in that: The support base (1) is equipped with a furnace body (3), the furnace body (3) is covered with a furnace cover (4), the furnace cover (4) is provided with a feeding door (5) for feeding materials, the furnace cover (4) is provided with an observation window (6) for observing the degree of spheroidization of the workpiece, the outer surface of the furnace body (3) is provided with a waste heat utilization device (7) for recovering and utilizing the waste heat in the tail gas inside the spheroidizing furnace, and the top of the support base (1) is provided with a control panel (2).

2. The spheroidizing furnace that can utilize the heat of exhaust gas according to claim 1, characterized in that: The waste heat utilization device (7) includes a pump body (71) installed on a support (1). The pump body (71) is provided with an air inlet (72) and an air outlet (73). Solenoid valves are provided at both the air inlet (72) and the air outlet (73). The pump body (71) recovers and reuses exhaust gas through the air inlet (72) and the air outlet (73) connected pipe assembly.

3. A spheroidizing furnace capable of utilizing tail gas heat according to claim 2, characterized in that: The piping assembly includes a pipe (74) connected to the furnace cover (4) and an insulation pipe (75) surrounding the furnace wall partition in the furnace body (3). The end of the pipe (74) away from the furnace cover (4) is connected to the air inlet (72) of the pump body (71). The insulation pipe (75) is spirally wound inside the furnace wall partition of the furnace body (3). One end of the insulation pipe (75) is connected to the air outlet (73) of the pump body (71). The pump body (71) absorbs the exhaust gas inside the spheroidizing furnace into the air inlet (72) through the pipe (74) and passes the high-temperature exhaust gas into the interior of the insulation pipe (75) through the air outlet (73). The high-temperature exhaust gas insulates the furnace wall partition in the furnace body (3) through the insulation pipe (75).

4. A spheroidizing furnace that can utilize the heat of exhaust gas according to claim 3, characterized in that: The support base (1) is provided with a purification box (76) for purifying exhaust gas. The top of the purification box (76) is connected to the end of the insulation pipe (75) away from the air outlet (73) of the pump body (71). The top of the purification box (76) is provided with a filling port (761). The outer surface of the purification box (76) is provided with a discharge pipe (762). The discharge pipe (762) is provided with a solenoid valve.

5. A spheroidizing furnace that can utilize the heat of exhaust gas according to claim 1, characterized in that: The furnace body (3) is equipped with a gas connection pipe, and a gas igniter is installed inside the furnace body (3). A material loading assembly (8) is installed inside the furnace body (3) above the gas igniter to carry the workpiece.

6. A spheroidizing furnace capable of utilizing tail gas heat according to claim 5, characterized in that: The material carrier assembly (8) includes a first substrate (81) and a second substrate (83). The second substrate (83) is placed above the gas igniter. The first substrate (81) is fixed on the second substrate (83) by inserting a rod (82) into the insertion hole (84) on the second substrate (83) to support and place the workpiece.

7. A spheroidizing furnace capable of utilizing tail gas heat according to claim 6, characterized in that: A central cylinder (85) is provided in the middle of the second substrate (83). The central cylinder (85) is connected to the gas connection pipe. Several slots (87) are provided on the top of the central cylinder (85) for engaging several arc-shaped support pieces (88).

8. A spheroidizing furnace that can utilize the heat of exhaust gas according to claim 7, characterized in that: The inner wall of the central cylinder (85) is provided with an air vent (86) which communicates with the internal area of ​​the arc-shaped support plate (88).

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