An induction-heated continuous dehydrogenation crusher

Abstract

This invention belongs to the field of rare earth permanent magnet hydrogen treatment technology, specifically a hydrogen crushing furnace, namely an induction-heated continuous dehydrogenation crushing furnace, comprising a hydrogen-containing material silo and a dehydrogenation unit. The dehydrogenation unit includes a rotatable dehydrogenation furnace chamber. The inlet of the dehydrogenation furnace chamber is connected to a feeding box, which feeds material into the furnace chamber via a feeder. The inlet of the feeder is connected to the bottom outlet of the hydrogen-containing material silo. The dehydrogenation furnace chamber is inclined, with its inlet higher than its outlet. The outlet of the dehydrogenation furnace chamber is connected to a discharge box, which discharges material from the furnace chamber via a discharge device. The outlet of the discharge box is connected to a discharge tank. The dehydrogenation furnace chamber is heated by a heating unit. The dehydrogenation furnace chamber is under vacuum during feeding, dehydrogenation, and discharging. The external temperature of the dehydrogenation furnace chamber is below 100 degrees Celsius, and there is no open flame, meeting the standards. This invention is rationally designed and has significant practical application value.

Description

Technical Field

[0001] This invention belongs to the field of rare earth permanent magnet hydrogen treatment technology, and relates to a hydrogen crushing furnace, specifically an induction heating continuous dehydrogenation crushing furnace, used for dehydrogenation treatment in industries such as titanium alloy powder, rare earth permanent magnet powder, and hydrogen storage powder. Background Technology

[0002] Currently, the dehydrogenation of titanium alloy powder faces the following problems: 1. In the field of titanium powder, dehydrogenation furnaces are used to load hydrogen-containing powder into small boats and dehydrogenate it in a vacuum sintering furnace. A large amount of hydrogen gas is removed, carrying away the titanium powder. Some of it condenses on the heated molybdenum belt, and each cleaning takes a lot of time. At the same time, titanium metal and molybdenum form a brittle alloy, which shortens the life of the heated belt.

[0003] 2. The hydrogen-containing powder accumulates in the feed boat. The powder is stationary. After dehydrogenation, diffusion occurs between the powder particles, which will agglomerate into clumps. Further crushing is required after dehydrogenation.

[0004] 3. For single-furnace operation, each furnace requires processes such as feeding, vacuuming, hydrogen charging, heating and dehydrogenation, cooling, inert gas charging, and unloading. The operation is complex and labor costs are high. In addition, the electric furnace is constantly heating and cooling, which increases energy consumption. It is necessary to improve the existing technology. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, an induction heating continuous dehydrogenation crushing furnace is provided.

[0006] This invention is achieved using the following technical solution: An induction-heated continuous dehydrogenation crusher includes a hydrogen-containing material bin and a dehydrogenation unit; The dehydrogenation unit includes a rotatable dehydrogenation furnace chamber. The inlet of the dehydrogenation furnace chamber is connected to a feed box, which feeds material into the dehydrogenation furnace chamber via a feeder. The inlet of the feeder is connected to the bottom outlet of the hydrogen-containing material silo. The dehydrogenation furnace chamber is inclined, with its inlet higher than its outlet. The outlet of the dehydrogenation furnace chamber is connected to a discharge box, which discharges material from the dehydrogenation furnace chamber via a discharge device. The outlet of the discharge box is connected to a discharge tank. The dehydrogenation furnace chamber is heated by a heating unit. The dehydrogenation furnace chamber is under vacuum during the feeding, dehydrogenation, and discharging processes.

[0007] During operation, the dehydrogenation furnace is fed through a feeder, maintaining a vacuum throughout the process. As the magnetic powder slides forward in the heating section of the furnace, the powder layer gradually thins and eventually enters the outlet, where it is discharged through a discharge device into a vacuum discharge tank.

[0008] More preferably, a feeding pipe is provided between the inlet of the feeder and the bottom outlet of the hydrogen-containing silo, and a clamp valve is installed on the feeding pipe. A vacuuming and gas filling interface is provided between the bottom valve of the feeding pipe and the clamp valve of the hydrogen-containing silo, so as to realize feeding under vacuum.

[0009] More preferably, the feed box is equipped with a vacuum port to achieve dehydrogenation under vacuum conditions.

[0010] More preferably, the heating section of the dehydrogenation furnace is covered with an insulation layer; the insulation layer is composed of a composite of an aluminum silicate fiber layer and an aerogel layer; the insulation layer rotates with the dehydrogenation furnace.

[0011] The heating unit is an induction coil arranged outside the dehydrogenation furnace chamber. The induction coil is connected to a medium-frequency induction power supply, and the induction coil is fitted with the insulation layer with a gap. Employing induction heating, the dehydrogenation furnace chamber serves as both a vacuum container and a heating element. The outer insulation material reduces heat radiation, saves energy, and effectively solves the problem of open flames in existing technologies. The furnace chamber cooling section is equipped with a cooling unit. Rain-type cooling ensures continuous heating and dehydrogenation in the dehydrogenation section, while the cooling section continuously cools the furnace.

[0012] More preferably, to better assemble the feeding box and achieve feeding into the dehydrogenation furnace chamber, a first sealed bearing is fitted outside the inlet of the dehydrogenation furnace chamber, and the feeding box is sealed to the outer ring of the first sealed bearing; the feeder seal passes through the feeding box and extends into the inlet of the dehydrogenation furnace chamber; the inlet of the feeder is connected to the outlet of the feeding box through a feeding pipe, and a clamping valve is installed on the feeding pipe; the feeding box is provided with a vacuum interface to keep the feeding process in a vacuum state.

[0013] More preferably, in order to better assemble the discharge box and realize discharge, a second sealed bearing is assembled on the outside of the outlet of the dehydrogenation furnace, and the discharge box is sealed to the outer ring of the second sealed bearing; The discharge device is a spiral discharge device, and a spiral blade segment is provided on the central shaft of the spiral discharge device. The spiral blade segment is located in the outlet of the dehydrogenation furnace. The discharge end of the dehydrogenation furnace is provided with a discharge inclined plate. The central shaft is sealed through the discharge box and connected to the output end of the reducer through a coupling.

[0014] More preferably, in order to achieve discharge under vacuum, a clamping valve and a tank valve are sequentially provided between the outlet of the discharge box and the discharge tank; a vacuum and inert gas connection is provided between the clamping valve and the tank valve.

[0015] More preferably, in order to control the distance between two batches of material, a material level sensor is provided on the dehydrogenation furnace at least 1m away from its inlet; the furnace body heating section of the dehydrogenation furnace is provided with multiple thermocouple sensors.

[0016] More preferably, to achieve slow sliding of the material from the inlet to the outlet within the dehydrogenation furnace, the horizontal inclination angle of the dehydrogenation furnace is 1-5°, and the material movement speed within the dehydrogenation furnace is 1-3 meters per hour. To achieve stable discharge, the diameter of the outlet of the dehydrogenation furnace is more than 1 / 4 of the furnace body diameter.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art: First, the device uses intermittent feeding and intermittent discharging to achieve continuous production and improve production efficiency.

[0018] Secondly, the powder absorbed by the device falls through pipes and clamp valves to the feeder below and is then fed into the dehydrogenation furnace, reducing the size of the device and saving costs.

[0019] Third, the device wraps the heating part of the furnace with insulation material and fixes the induction coil on the outside to achieve heating; a water spray cooling device and a water receiving tank are installed on the side near the discharge device; it not only solves the problem of open flame in the existing technology, but also ensures that the dehydrogenation section is always heated for dehydrogenation and the cooling section is always cooled.

[0020] Fourth, in this device, the powder is heated and cooled, and when it reaches the end of the dehydrogenation furnace, it is sent to the outlet of the furnace through the discharge ramp. After being discharged by the discharge device, it falls into the discharge tank, and vacuum discharge is achieved.

[0021] This invention is reasonably designed and has great practical application value. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram showing the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the front part of the hydrogen absorption unit in this invention.

[0026] Figure 3 This is a schematic diagram showing the feeding structure of the hydrogen absorption unit in this invention.

[0027] Figure 4 This diagram shows the internal support plate and external support of the dehydrogenation furnace.

[0028] Figure 5 This is a schematic diagram of the rear of the dehydrogenation unit.

[0029] Figure 6 This is a magnified view showing the position of the level sensor in the dehydrogenation unit.

[0030] In the diagram: 100-Hydrogen-containing silo, 101-Bottom valve, 102-Vacuuming and gas-filling interface, 103-Vacuum valve; 200-Dehydrogenation unit, 201-Dehydrogenation furnace chamber, 202-Inlet section, 203-Outlet section, 204-Feed box, 205-Feeder, 206-Discharge box, 207-Discharger, 208-Discharge tank, 209-Alumina silicate fiber layer, 210-Aerogel layer, 211-Induction coil, 212-Spray pipe, 213-Water receiving tank 214-First sealed bearing, 215-Feeding pipe, 216-Pin clamp valve, 217-Vacuum interface, 218-Central shaft, 219-Helical blade segment, 220-Discharge inclined plate, 221-Reducer, 222-Motor, 223-Tank valve, 224-Vacuum and inert gas connection pipe, 225-Level sensor, 226-Thermocouple sensor, 227-Second sealed bearing, 228-Support ring, 229-Support wheel assembly, 230-Lifting plate. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0032] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0034] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] An induction-heated continuous dehydrogenation crusher includes a sealed hydrogen-containing silo 100 and a dehydrogenation unit 200.

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the dehydrogenation unit 200 includes a rotatable dehydrogenation furnace 201. The inlet 202 of the dehydrogenation furnace 201 is connected to a feed box 204. The feed box 204 feeds material into the dehydrogenation furnace 201 through a feeder 205. The inlet of the feeder 205 is connected to the bottom outlet of the hydrogen-containing silo 100. The dehydrogenation furnace 201 is inclined, and its inlet 202 is higher than its outlet 203. The outlet 203 of the dehydrogenation furnace 201 is connected to a discharge box 206. The discharge box 206 discharges material from the dehydrogenation furnace 201 through a discharger 207. The outlet of the discharge box 204 is connected to a discharge tank 208. The dehydrogenation furnace 201 is heated by a heating unit. The dehydrogenation furnace 201 is in a vacuum state during the feeding, dehydrogenation, and discharging processes.

[0037] In this embodiment, the dehydrogenation furnace liner 201 adopts a conventional rotation method. For example, support rings 228 are set on at least the front and rear parts of the dehydrogenation furnace liner 201 and supported on the support wheel assembly 229. Then, a sprocket is coaxially provided on the front or rear end of the dehydrogenation furnace liner 201. The rotation of the dehydrogenation furnace liner 201 is driven by a motor through chain transmission.

[0038] like Figure 3 As shown, a first sealed bearing 214 is externally mounted on the inlet 202 of the dehydrogenation furnace 201. The feed box 204 is sealed to the outer ring of the first sealed bearing 214, thus communicating with the inlet 202 of the dehydrogenation furnace 201. A vacuum port 217 is provided on the feed box 204. The feeder 205 is a screw feeder, which is existing technology. The screw feeder passes through the feed box 204 in a sealed manner (a sealing plate is provided at the passage) and extends into the inlet of the dehydrogenation furnace 201. The inlet of the feeder 205 is connected to the outlet of the hydrogen-containing silo 100 through the feed pipe 215 (a bottom valve 101 is installed at the outlet, and a clamp valve 216 is installed on the feed pipe 205). A vacuum and gas filling port 102 is provided between the bottom valve 101 and the clamp valve 216 in the hydrogen-containing silo 100, and a vacuum valve 103 is installed thereon.

[0039] like Figure 4As shown, the inner wall of the dehydrogenation furnace chamber 201 is equipped with lifting plates 230, which lift the powder and expose it to the vacuum better.

[0040] like Figure 5 As shown, a second sealed bearing 227 is fitted externally to the outlet 203 of the dehydrogenation furnace 201. The discharge box 206 is sealed to the outer ring of the second sealed bearing 227, thus communicating with the outlet 203 of the dehydrogenation furnace 201. The discharge device 207 is a screw discharge device. A spiral blade segment 219 is provided on the central shaft 218 of the screw discharge device. This spiral blade segment 219 is located inside the outlet 203 of the dehydrogenation furnace 201. The discharge end of the dehydrogenation furnace 201 is provided with a discharge inclined plate 220, which cooperates with the spiral blade segment 219 to achieve discharge, solving the problem of powder agglomeration. The central shaft 218 is sealed through (a sealing plate is provided at the passage) the discharge box 206 and is connected to the output end of the reducer 221 via a coupling. The reducer 221 is connected to the motor 222. By designing an independently driven motor and reducer at the discharge end, the diameter of the outlet section (spiral blade segment 219) of the dehydrogenation furnace 201 is more than 1 / 4 of the furnace body diameter, achieving a discharge speed greater than the feeding speed. A clamp valve 216 and a tank valve 223 are sequentially installed between the outlet of the discharge box 206 and the discharge tank 208; a vacuum and inert gas connection pipe 224 is located between the clamp valve 216 and the tank valve 223.

[0041] like Figure 1 , Figure 2 As shown, the heating section of the dehydrogenation furnace 201 is covered with an insulation layer. This insulation layer is composed of an aluminum silicate fiber layer 209 and an aerogel layer 210, with cloth strips wrapped around the outermost layer, rotating with the furnace. The heating unit is an induction coil 211 located outside the furnace of the dehydrogenation furnace 201. The induction coil 211 is connected to a medium-frequency induction power supply, and its position is fixed with a gap fit to the insulation layer, which rotates with the furnace. The heating area is tightly wrapped with insulation material, and the temperature of the exposed metal parts of the furnace is below 100 degrees Celsius, far below the ignition temperature of hydrogen (570 degrees Celsius). The temperature of the entire equipment does not exceed 100 degrees Celsius, meeting the requirements of GB50058 "Design Code for Electrical Installations in Explosive Atmospheres".

[0042] like Figure 1 As shown, the furnace cooling section of the dehydrogenation furnace 201 is equipped with a cooling unit, including a spray pipe 212 located above the furnace and a water receiving tank 213 located below the furnace, which achieves continuous cooling by spraying water.

[0043] like Figure 6 As shown, a material level sensor 225 is installed on the dehydrogenation furnace liner 201 at least 1m away from its inlet.

[0044] like Figure 1As shown, the furnace heating section of the dehydrogenation furnace 201 is equipped with multiple thermocouple sensors 226 for measuring temperature.

[0045] The horizontal tilt angle of the dehydrogenation furnace chamber 201 is 1-5°, and the actual design in this embodiment is 3 degrees. The rotation speed is 10 revolutions per hour. During rotation, the material slides downward slowly. The actual design moving speed is 1-3 meters per hour.

[0046] The specific working process is as follows: The vacuum unit is started, and a vacuum is created using the vacuum port 217 on the feed box 204. Once the vacuum level reaches 0.5 Pa, the feeder 205 is started, the rotary kiln motor is started, the dehydrogenation furnace 201 rotates, the induction heating power supply is started, and the spray cooling system is started. The vacuum valve 103 is opened, the vacuum generator is started, and feeding begins in a vacuum state through the vacuum and gas filling port 102 via the feed pipe 215. The bottom valve 101 is opened, and the feeder 205 completes the feeding of the dehydrogenation furnace 201. After feeding is completed, the bottom valve 101 is closed, and the hydrogen-containing material silo 100 is filled to atmospheric pressure through the vacuum and gas filling port 102, preparing for the next dehydrogenation. The feeding speed is controlled so that the material layer height is approximately equal to the radius of the furnace silo. The vacuum unit is connected to the feed box 204 via the vacuum port 217, and a vacuum state is maintained throughout the operation, with a vacuum level between 100-500 Pa. As the magnetic powder slides forward in the heating section of the furnace, the powder layer gradually thins. In the heating zone, the lifting plate 230 lifts the powder, and because the rotary furnace tube is inclined, it moves slowly downwards during rotation. Due to the thin material layer, the powder experiences minimal force, and being in constant motion, powder adhesion is reduced. The powder, lifted by the lifting plate, is better exposed to the vacuum, resulting in a much faster dehydrogenation rate compared to dehydrogenation within a crucible. After dehydrogenation, the powder enters the cooling section for diffusion cooling, where it is cooled by water spray. Finally, it passes through the discharge inclined plate 220 into the spiral blade segment 219 of the outlet section 203. Driven by the motor 222 and reducer 221, the powder passes through the discharge box 206, clamp valve 216, and material tank valve 223 into the vacuum discharge tank 208. The motor 222 and reducer 221 are located on a moving trolley, which moves along a guide rail. The spiral discharger has an independent rotation drive, with a rotation speed greater than the ratio of furnace diameter to discharge spiral diameter. Because the diameter of the rotary kiln chamber (1000mm) is much larger than that of the discharge outlet (260mm), the rotational speed of the central shaft 218 must be greater than 10*1000 / 260=38 revolutions per minute, with an actual operating speed of 200 revolutions per hour. Since the dehydrogenation unit operates under vacuum throughout the entire process, the discharge process also takes place under vacuum. Therefore, when changing the discharge tank 208, after connecting the discharge pipe, open the tank valve 223, connect the vacuum system via the vacuum pump and inert gas connection 224, and once the vacuum reaches 10Pa, open the clamp valve 216 to begin discharge. After discharge is complete, close the clamp valve 216, fill the tank with argon or nitrogen via the vacuum pump and inert gas connection 224, and then remove the discharge tank 208.

[0047] Because the feeding and discharging are intermittent, and to handle magnetic powders of different compositions, a sufficient interval must be maintained between the two batches to prevent mixing and allow enough time for discharging and changing the discharge bucket. The minimum distance between the two batches is controlled at 1m. A level sensor 225 is installed 1m from the inlet of the dehydrogenation furnace chamber 201. Before the next feeding, it is verified that there is no material at this point.

[0048] Based on specific application examples, with an average powder particle size of 20 micrometers and an initial hydrogen content of 40,000 ppm, and a heating temperature of 700 degrees Celsius, the dehydrogenation time in the dehydrogenation furnace is 48 hours. After dehydrogenation, the powder has a hydrogen content of 150 ppm and almost no adhesion, so secondary crushing is not required.

[0049] Furthermore, regarding valves, conventional ball valves and butterfly valves have extremely short lifespans due to the presence of metal powder. This invention employs a clamp valve tube and a ball-domed valve, resulting in a longer lifespan. A clamp valve is essentially a rubber tube of a certain thickness with clamping rods or blocks on the outside, closing the tube wall and preventing both powder and gas from passing through.

[0050] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. An induction-heated continuous dehydrogenation crusher, comprising a hydrogen-containing material bin (100) and a dehydrogenation unit (200). Its features are: The dehydrogenation unit (200) includes a rotatable dehydrogenation furnace chamber (201). The inlet (202) of the dehydrogenation furnace chamber (201) is connected to a feed box (204). The feed box (204) feeds material into the dehydrogenation furnace chamber (201) through a feeder (205). The inlet of the feeder (205) is connected to the bottom outlet of the hydrogen-containing silo (100). The dehydrogenation furnace chamber (201) is inclined, and its inlet (202) is higher than the inlet of the furnace chamber. Outlet section (203); the outlet section (203) of the dehydrogenation furnace (201) is connected to the discharge box (206), the discharge box (206) completes the discharge of the dehydrogenation furnace (201) through the discharge device (207), and the outlet of the discharge box (204) is connected to the discharge tank (208); the dehydrogenation furnace (201) is heated by the heating unit; the dehydrogenation furnace (201) is in a vacuum state during the feeding, dehydrogenation and discharge process.

2. The induction heating continuous dehydrogenation crusher according to claim 1, characterized in that: A feeding pipe (215) is provided between the inlet of the feeder (205) and the bottom outlet of the hydrogen-containing silo (100). A clamp valve (216) is installed on the feeding pipe (215). A vacuuming and gas filling interface (102) is provided between the bottom valve (101) and the clamp valve (216) of the feeding pipe (215). The feed box (204) is equipped with a vacuum port (217).

3. The induction heating continuous dehydrogenation crusher according to claim 1 or 2, characterized in that: The furnace heating section of the dehydrogenation furnace (201) is covered with an insulation layer; the insulation layer is composed of an aluminum silicate fiber layer (209) and an aerogel layer (210).

4. The induction heating continuous dehydrogenation crusher according to claim 3, characterized in that: The heating unit is an induction coil (211) arranged outside the furnace shell of the dehydrogenation furnace (201). The induction coil (211) is connected to a medium-frequency induction power supply, and the induction coil (211) is fitted with the insulation layer with a gap. The dehydrogenation furnace liner (201) is equipped with a cooling unit in the furnace liner cooling section; The external temperature of the dehydrogenation furnace chamber (201) is below 100 degrees Celsius.

5. The induction heating continuous dehydrogenation crusher according to claim 4, characterized in that: The inlet (202) of the dehydrogenation furnace (201) is equipped with a first sealed bearing (214), and the feed box (204) is sealed to the outer ring of the first sealed bearing (214); the feeder (205) passes through the feed box (204) and extends into the inlet of the dehydrogenation furnace (201).

6. The induction heating continuous dehydrogenation crusher according to claim 5, characterized in that: The outlet (203) of the dehydrogenation furnace (201) is equipped with a second sealed bearing (227), and the discharge box (206) is sealed to the outer ring of the second sealed bearing (227). The discharge device (207) is a spiral discharge device. The spiral discharge device has a spiral blade segment (219) on its central shaft (218). The spiral blade segment (219) is located in the outlet (203) of the dehydrogenation furnace (201). The discharge end of the dehydrogenation furnace (201) is provided with a discharge inclined plate (220). The central shaft (218) passes through the discharge box (206) and is connected to the output end of the reducer (221) through a coupling.

7. The induction heating continuous dehydrogenation crusher according to claim 6, characterized in that: The outlet of the discharge box (206) and the discharge tank (208) are connected in sequence by a clamp valve (216) and a tank valve (223); a vacuum and inert gas connection pipe (224) is provided between the clamp valve (216) and the tank valve (223).

8. The induction heating continuous dehydrogenation crusher according to claim 7, characterized in that: A level sensor (225) is provided on the dehydrogenation furnace (201) at least 1m away from its inlet; multiple thermocouple sensors (226) are provided in the furnace heating section of the dehydrogenation furnace (201).

9. The induction heating continuous dehydrogenation crusher according to claim 8, characterized in that: The inner wall of the dehydrogenation furnace (201) is provided with a lifting plate (230).

10. The induction heating continuous dehydrogenation crusher according to claim 9, characterized in that: The horizontal tilt angle of the dehydrogenation furnace (201) is 1-5°; the diameter of the outlet of the dehydrogenation furnace (201) is more than 1 / 4 of the diameter of its furnace body; the moving speed of the material inside the dehydrogenation furnace (201) is 1-3 meters / hour.

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