Rotary reduction furnace

Abstract

The utility model discloses a rotary reduction furnace which comprises a furnace tube, the furnace tube comprises a furnace head end and a furnace tail end, materials enter the furnace tube through the furnace head end, and the materials leave the furnace tube through the furnace tail end; the furnace tube comprises a heating section, and the shoveling plate is arranged on the heating section and connected with the inner wall of the furnace tube; the shoveling plate extends from the furnace tail end in the axial direction of the furnace tube, a gap is formed between the shoveling plate and the furnace head end, and the length of the gap is 5%-20% of the length of the heating section. Hydrogen enters the furnace tube through the furnace tail end, leaves the furnace tube through the furnace head end, and is in contact reduction with materials in the furnace tube. The shoveling plate not only raises materials in the rotating process along with the furnace tube, but also can promote mixing of the materials and hydrogen, the shoveling plate and the furnace end are arranged at an interval, that is, the position, close to the furnace end, of the heating section is not provided with the shoveling plate, the materials are prevented from being raised at the furnace end, and less materials are carried when the hydrogen leaves the furnace tube from the furnace end; therefore, the blocking frequency of the trapping device can be reduced to ensure stable pressure in the reduction furnace.

Description

Technical Field

[0001] This utility model relates to the field of metal recycling equipment technology, and more specifically, to a rotary reduction furnace. Background Technology

[0002] Tungsten powder is the main raw material for processing tungsten products and tungsten alloys into powder metallurgy products. Pure tungsten powder can be made into processed materials such as wires, rods, tubes, and plates, as well as products of certain shapes. When mixed with other metal powders, tungsten powder can be used to make various tungsten alloys, such as tungsten-molybdenum alloys, tungsten-rhenium alloys, tungsten-copper alloys, and high-density tungsten alloys. Another important application of tungsten powder is in the production of tungsten carbide powder, which is then used to manufacture cemented carbide tools, such as lathe tools, milling cutters, drill bits, and molds.

[0003] Currently, both domestically and internationally, the main method for tungsten powder preparation is through a reduction rotary furnace. This high-temperature environment allows tungsten oxide and hydrogen to come into full contact, achieving the reduction process. The material enters from the furnace head, is reduced in the heating zone, then enters the cooling zone, and finally reaches the furnace tail, where it is sieved and discharged. When the material enters from the furnace head, the main hydrogen is preheated to the process temperature before entering the furnace tubes from the furnace tail. It is then reduced by the material in the heating zone and exits from the furnace head outlet into a cooling tower. The cooled hydrogen then enters a dust collector for ash removal. After exiting the dust collector, it is washed in a scrubbing tower before entering the hydrogen purification system.

[0004] However, in the existing technology, during the material feeding process from front to back, due to the large flow of hydrogen from back to front, the airflow carries the material to the furnace head, which can easily bring some material into the dust collection area of ​​the furnace head. As the amount of dust collected increases, the hydrogen can easily clog the filter screen of the tank after passing through the cooling tower and the collection device, causing the hydrogen to be unable to flow back to the hydrogen purification system in time, which in turn leads to an increase in the pressure inside the furnace and increases the risk of equipment explosion.

[0005] Therefore, there is an urgent need to provide a rotary reduction furnace that can reduce the loss of powder with hydrogen. Utility Model Content

[0006] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and provide a rotary reduction furnace, comprising:

[0007] The furnace tube includes a furnace head end and a furnace tail end. Material enters the furnace tube through the furnace head end and exits the furnace tube through the furnace tail end.

[0008] The furnace tube includes a heating section, and a lifting plate is disposed in the heating section. The lifting plate is connected to the inner wall of the furnace tube. The lifting plate extends from the tail end of the furnace along the axial direction of the furnace tube, and there is a gap between the lifting plate and the head end of the furnace. The length of the gap is 5%-20% of the length of the heating section.

[0009] Implementing the embodiments of this utility model will have the following beneficial effects:

[0010] This invention provides a rotary reduction furnace, comprising: a furnace tube, including a furnace head end and a furnace tail end; material enters the furnace tube through the furnace head end and exits the furnace tube through the furnace tail end; the furnace tube includes a heating section, with lifting plates disposed in the heating section and connected to the inner wall of the furnace tube; the lifting plates extend from the furnace tail end along the axial direction of the furnace tube, with a gap between the lifting plates and the furnace head end, the gap being 5%-20% of the length of the heating section. Hydrogen enters the furnace tube through the furnace tail end, and material exits the furnace tube through the furnace head end, with hydrogen and material contacting and reducing each other within the furnace tube. During the rotation of the furnace tube, the lifting plates not only lift the material but also promote mixing between the material and hydrogen. By creating a gap between the lifting plates and the furnace head end—that is, by not placing lifting plates near the furnace head end in the heating section—material is prevented from being lifted at the furnace head end. This reduces the amount of material carried by the hydrogen as it exits the furnace tube from the furnace head end, thereby reducing the frequency of clogging of the collection device and ensuring stable pressure within the reduction furnace. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] in:

[0013] Figure 1 A schematic diagram of the rotary reduction furnace provided by this utility model;

[0014] Figure 2 This is a schematic diagram of a furnace tube in a rotary reduction furnace provided by this utility model.

[0015] Figure 3 for Figure 1 A cross-sectional view along the A-A' direction. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figure 1 , Figure 2This utility model discloses a rotary reduction furnace, characterized in that it includes a furnace tube 1, which includes a furnace head end 11 and a furnace tail end 12. Material enters the furnace tube 1 through the furnace head end 11 and exits the furnace tube 1 through the furnace tail end 12. The furnace tube 1 includes a heating section 13, and a lifting plate 2 is disposed in the heating section 13 and connected to the inner wall of the furnace tube 1. The lifting plate 2 extends from the furnace tail end 12 along the axial direction of the furnace tube 1, and there is a gap between the lifting plate 2 and the furnace head end 11. The length d of the gap is 5%-20% of the length D of the heating section 13.

[0018] Specifically, when the length d of the interval is less than 5% of the length D of the heating section 13, the interval is too short and cannot prevent the material at the furnace head 11 from being lifted; when the length d of the interval is greater than 20% of the length D of the heating section 13, the interval is too long and the length of the lifting plate 2 is too short, resulting in uneven mixing of material and hydrogen in the furnace tube 1, which affects the reduction reaction.

[0019] It should be noted that the material enters the furnace tube 1 through the furnace head end 11, and hydrogen enters the furnace tube 1 through the furnace tail end 12. The hydrogen and material come into contact and are reduced inside the furnace tube 1. Then, the hydrogen continues to exit the furnace tube 1 from the furnace head end 11, and the reduced material exits the furnace tube 1 from the furnace tail end 12. Specifically, the material includes tungsten carbide powder, and the hydrogen reduces the tungsten carbide to pure tungsten powder.

[0020] Understandably, hydrogen enters the furnace tube 1 through the tail end 12, while the material exits the furnace tube 1 through the head end 11. The hydrogen and material are heated and reduced in the heating section 13. The lifting plate 2 not only lifts the material during the rotation of the furnace tube 1 but also promotes the mixing between the material and hydrogen. By spacing the lifting plate 2 from the head end 11 (i.e., not installing the lifting plate 2 near the head end 11 in the heating section 13), material is prevented from being lifted at the head end 11. This reduces the amount of material carried by the hydrogen when it leaves the furnace tube 1 from the head end 11, thereby reducing the clogging frequency of the collection device 7 and ensuring stable pressure inside the reduction furnace.

[0021] Furthermore, the heating section 13 is equipped with two or more lifting plates 2 spaced apart along the circumference of the furnace tube 1. (Refer to...) Figure 3 Taking the setting of four lifting plates 2 as an example, setting multiple lifting plates 2 helps to lift the material, making the material and hydrogen more uniform and mixed.

[0022] In one specific embodiment, reference is made to Figure 1 The rotary reduction furnace also includes a hydrogen preheating device 3, a feeding device 4, a dust collection device 5, a cooling device 6, a collection device 7, and a hydrogen scrubbing device 8.

[0023] The hydrogen preheating device 3 is connected to the tail end 12 of the furnace, and the tail end 12 is also provided with a discharge port 13; the feeding device 4 is connected to the head end 11 of the furnace, and the head end 11 is also provided with a hydrogen outlet 14. The hydrogen outlet 14, the dust collection device 5, the cooling device 6, the collection device 7 and the hydrogen scrubbing device 8 are connected in sequence; the furnace tube 1 also includes a cooling section 13. Along the direction from the head end 11 to the tail end 12 of the furnace, the heating section 13 and the cooling section 12 are connected in sequence.

[0024] In this embodiment, the material enters the furnace tube 1 from the furnace head end 11 and is conveyed into the furnace tube 1 by the screw feeder motor of the feeding device 4. The height of the furnace head end 11 is greater than the height of the furnace tail end 12. That is, the furnace tube 1 is inclined downward from the furnace head end 11 to the furnace tail end 12, with an inclination angle of no more than 10°. The material enters the heating section 13 as the furnace tube 1 rotates. The material is reduced along the inner wall of the furnace tube 1. After passing through the heating section 13, the material enters the cooling section 12. Finally, after the reduction is completed, the material reaches the furnace tail end 12 and is discharged through the discharge port 13 by the screen. When the material enters from the furnace head end 11, the main hydrogen enters the hydrogen preheating device 3 through the hydrogen inlet pipe. One end of the hydrogen preheating device 3 is connected to the furnace tail end 12, and the other end is equipped with a main hydrogen valve 31. The hydrogen temperature is raised to the process temperature, and then enters the furnace tube 1 from the furnace tail end 12. After being heated at high temperature and the material is reduced in the furnace tube 1, the hydrogen comes out from the hydrogen outlet 14 of the furnace head end 11 and enters the dust collection device 5, and then enters the cooling device 6 for cooling. The returned hydrogen after being cooled by the cooling device 6 enters the dust collection device 7 for dust removal. After the hydrogen comes out of the collection device 7, it is washed by the hydrogen scrubbing device 8 and then enters the hydrogen purification system. One end of the hydrogen scrubbing device 8 is connected to the collection device 7, and the other end is equipped with a hydrogen return valve 81.

[0025] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rotary reduction furnace, characterized in that, include: The furnace tube includes a furnace head end and a furnace tail end. Material enters the furnace tube through the furnace head end and exits the furnace tube through the furnace tail end. The furnace tube includes a heating section, and a lifting plate is disposed in the heating section. The lifting plate is connected to the inner wall of the furnace tube. The lifting plate extends from the tail end of the furnace along the axial direction of the furnace tube, and there is a gap between the lifting plate and the head end of the furnace. The length of the gap is 5%-20% of the length of the heating section.

2. The rotary reduction furnace according to claim 1, characterized in that, The heating section is provided with two or more lifting plates spaced apart along the circumference of the furnace tube.

3. The rotary reduction furnace according to claim 1, characterized in that, The furnace tube also includes a cooling section, and the heating section and the cooling section are connected in sequence along the direction from the furnace head end to the furnace tail end.

4. The rotary reduction furnace according to claim 1, characterized in that, The height of the furnace head end is higher than the height of the furnace tail end.

5. The rotary reduction furnace according to claim 4, characterized in that, The inclination angle of the furnace tube is no greater than 10°.

6. The rotary reduction furnace according to claim 1, characterized in that, It also includes a hydrogen preheating device, which is connected to the tail end of the furnace.

7. The rotary reduction furnace according to claim 1, characterized in that, It also includes a feeding device, which is connected to the furnace head end.

8. The rotary reduction furnace according to claim 1, characterized in that, The furnace head end is also equipped with a hydrogen outlet.

9. The rotary reduction furnace according to claim 8, characterized in that, It also includes a dust collection device, a cooling device, a collection device, and a hydrogen scrubbing device connected in sequence, wherein the dust collection device is connected to the hydrogen outlet.

10. The rotary reduction furnace according to claim 1, characterized in that, The furnace tail end is also provided with a discharge port.

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