Rotary reduction furnace capable of reducing dust

Abstract

The utility model discloses a dust fall type 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 blocking structure is arranged in the furnace tube and connected with the inner wall of the furnace tube, the blocking structure is arranged close to the furnace head end, and a through hole for materials to pass through is formed in the blocking structure. 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 blocking structure can block part of materials on the inner wall of the blocking structure, and the materials can slide to the inner wall of the furnace tube from the inner wall of the blocking structure through rotation of the furnace. A part of materials can be retained on the outer wall of the blocking structure, the falling process of the materials is delayed, the hang time of the materials is prolonged, and the materials are more uniform; the blocking structure is arranged to block materials, so that less materials are carried when hydrogen leaves the furnace tube, the blocking frequency of the trapping device can be reduced, and stable pressure in the reduction furnace is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of metallurgy more particularly, relate to a dust fall formula rotary reduction furnace. BACKGROUND

[0002] Tungsten powder is the main raw material for processing powder metallurgy tungsten products and tungsten alloys. Pure tungsten powder can be made into wire, rod, tube, plate and other processing materials and certain shape products. Tungsten powder mixed with other metal powder can be made into various tungsten alloys, such as tungsten molybdenum alloy, tungsten rhenium alloy, tungsten copper alloy and high density tungsten alloy. Another important application of tungsten powder is to make tungsten carbide powder, and then to prepare hard alloy tools such as turning tools, milling tools, drill bits and molds. Therefore, tungsten powder not only occupies an important position in strategic resources, but also plays a key role in military industry and high-tech manufacturing industry, which embodies its irreplaceable strategic value. Therefore, higher requirements are put forward for the quality of tungsten powder.

[0003] At present, the main method for preparing tungsten powder at home and abroad is to make the oxide of tungsten and hydrogen gas fully contact in a high temperature environment by using a reduction rotary furnace. The material enters from the head of the reduction rotary furnace, is reduced in the heating zone, then enters the cooling zone, and finally reaches the tail of the furnace through the screening machine to screen out the material. When the material enters from the head, the main hydrogen is preheated to the process temperature, then enters the furnace tube from the tail, is reduced in the heating zone and the material, and then comes out from the discharge port of the head into the cooling tower for cooling. The hydrogen gas cooled in the cooling tower enters the trapping device for dust removal, and then enters the hydrogen purification system after being washed in the washing tower.

[0004] However, in the existing technology, during the feeding process from front to back, a large amount of hydrogen gas is transported from back to front, which easily carries part of the material into the dust collection area of the head, increases the amount of dust collection, and blocks the filter screen of the tank after the hydrogen gas passes through the cooling tower and the trapping device, causing the hydrogen gas to be unable to return to the hydrogen purification system in time, thereby increasing the risk of explosion of the equipment.

[0005] Therefore, it is urgent to provide a dust fall formula rotary reduction furnace capable of reducing the accumulation of dust at the head. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the above-mentioned defects in the prior art, and provides a dust fall formula rotary reduction furnace, which comprises:

[0007] A furnace tube, which comprises a head end and a tail end, the material enters the furnace tube through the head end, and the material leaves the furnace tube through the tail end.

[0008] A blocking structure is arranged in the furnace tube and connected with the inner wall of the furnace tube, the blocking structure is arranged close to the furnace head end, and the blocking structure is provided with a through hole for the material to pass through.

[0009] The embodiment of the utility model is implemented, will have following beneficial effect:

[0010] The utility model provides a dust reduction type rotary reduction furnace, include: furnace tube, furnace tube includes furnace head end and furnace tail end, material passes through furnace head end and enters the furnace tube, and material passes through furnace tail end and leaves the furnace tube, blocking structure is arranged in the furnace tube and is connected with the inner wall of the furnace tube, and the blocking structure is arranged close to the furnace head end, and the blocking structure is provided with a through hole for the material to pass through. Hydrogen enters the furnace tube through the furnace tail end, hydrogen leaves the furnace tube through the furnace head end, and hydrogen and the material contact and reduce in the furnace tube. The blocking structure can block part of the material in the inner wall of the blocking structure, and the rotating material of the furnace itself can slide from the inner wall of the blocking structure to the inner wall of the furnace tube. The outer wall of the blocking structure can retain part of the material, delay the process of the material falling, increase the air retention time of the material, and make the material more uniformly heated; by blocking the material by the blocking structure, the material carried by hydrogen when leaving the furnace tube is less, so that the clogging frequency of the trapping device can be reduced to ensure the stability of the pressure in the reduction furnace. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0012] Among them:

[0013] Figure 1 A schematic view of the dust reduction type rotary reduction furnace provided by the utility model;

[0014] Figure 2 For Figure 1 A sectional view in A-A' direction;

[0015] Figure 3 A schematic view of the furnace tube in the dust reduction type rotary reduction furnace provided by the utility model. DETAILED DESCRIPTION

[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 2 This utility model discloses a dust-reducing rotary reduction furnace, comprising: a furnace tube 1 and a blocking structure 2 disposed inside the furnace tube 1 and connected to the inner wall of the furnace tube 1. The furnace tube 1 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 blocking structure 2 is disposed near the furnace head end 11 and has a through hole 21 for material to pass through.

[0018] 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. Along the direction from the furnace head end 11 to the furnace tail end 12, the furnace tube 1 is sequentially provided with a heating section 13 and a cooling section 14. The hydrogen is heated at a high temperature in the heating section 13 and undergoes a reduction reaction with the material. The blocking structure 2 is set in the heating section 13.

[0019] Understandably, the blocking structure 2 can block some material on its inner wall. Through the rotation of the furnace tube 1 itself, the material can slide from the inner wall of the blocking structure 2 to the inner wall of the furnace tube 1. The outer wall of the blocking structure 2 can also retain some material, slowing down the falling process and increasing the material's residence time, making the material more evenly heated. By setting the blocking structure 2 to block the material, less material is carried when hydrogen leaves the furnace tube 1, thereby reducing the frequency of dust blockage in the dust collection device 9 and ensuring stable pressure inside the reduction furnace.

[0020] Furthermore, referring to Figure 1 The dust-reducing rotary reduction furnace also includes a hydrogen preheating device 5, a feeding device 6, a dust collection device 7, a cooling device 8, a collection device 9, and a hydrogen scrubbing device 10.

[0021] The hydrogen preheating device 5 is connected to the tail end 12 of the furnace, and the tail end 12 is also provided with a discharge port 15; the feeding device 6 is connected to the head end 11 of the furnace, and the head end 11 is also provided with a hydrogen outlet 16. The hydrogen outlet 16, the dust collection device 7, the cooling device 8, the collection device 9 and the hydrogen scrubbing device 10 are connected in sequence.

[0022] 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 6. 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 14. Finally, after the reduction is completed, the material reaches the furnace tail end 12 and is discharged through the discharge port 15 by the screen. When the material enters from the furnace head end 11, the main hydrogen enters the hydrogen preheating device 5 through the hydrogen inlet pipe. One end of the hydrogen preheating device 5 is connected to the furnace tail end 12, and the other end is equipped with a main hydrogen valve 51. 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 exits from the hydrogen outlet 16 of the furnace head end 11 and enters the dust collection device 7, and then enters the cooling device 8 for cooling. The returned hydrogen after being cooled by the cooling device 8 enters the dust collection device 9 for dust removal. After the hydrogen exits from the dust collection device 9, it is washed by the hydrogen scrubbing device 10 and then enters the hydrogen purification system. One end of the hydrogen scrubbing device 10 is connected to the dust collection device 9, and the other end is equipped with a hydrogen return valve 101.

[0023] In one specific embodiment, reference is made to Figure 2 The blocking structure 2 has an opening 22 on its side wall. The blocking structure 2 can block some of the material on its inner side wall. By rotating the rotary reduction furnace itself, the material can slide down to the side wall of the furnace tube 1 through the opening 22 on the side wall of the blocking structure 2.

[0024] Furthermore, referring to Figure 3 The furnace tube 1 is provided with two or more blocking structures 2 arranged sequentially along the axial direction of the furnace tube 1 to improve the blocking effect of materials. Figure 3 The example shown uses 7 blocking structures.

[0025] Furthermore, referring to Figure 3 Along the direction from the furnace head end 11 to the furnace tail end 12, the diameter of the through hole 21 gradually increases. That is, in the direction from the furnace head end 11 to the furnace tail end 12, the inner wall of the blocking structure 2 is inclined downward, which facilitates the material to slide from the inner wall of the blocking structure 2 to the inner wall of the furnace tube 1.

[0026] In one specific embodiment, reference is made to Figure 2 , Figure 3 The dust-reducing rotary reduction furnace also includes a support member 3, which connects the blocking structure 2 to the inner wall of the furnace tube 1. The support member 3 includes a support bar 31. Figure 2 The example shown uses only three support bars 31. By setting the support bars 31 to connect the blocking structure 2 and the inner wall of the furnace tube 1, the support bars 31 will not block the furnace tube 1, facilitating the movement of hydrogen and materials.

[0027] In one specific embodiment, reference is made toFigure 2 , Figure 3 The inner wall of the furnace tube 1 is also provided with lifting plates 4 arranged along the axial direction of the furnace tube 1. When the lifting plates 4 rotate with the furnace tube 1, they can lift up the material and loosen the material during the lifting and falling process, which helps the material to come into fuller contact with hydrogen, thereby improving the heat exchange efficiency.

[0028] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, 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 dust-reducing 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. A blocking structure is provided inside the furnace tube and connected to the inner wall of the furnace tube. The blocking structure is located near the furnace head end and has through holes for the material to pass through.

2. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, The blocking structure has openings on its sidewalls.

3. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, The diameter of the through hole gradually increases along the direction from the furnace head end to the furnace tail end.

4. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, The furnace tube is provided with two or more blocking structures arranged sequentially along the axial direction of the furnace tube.

5. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, It also includes a support member that connects the blocking structure to the inner wall of the furnace tube, and the support member includes a support bar.

6. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, The inner wall of the furnace tube is also provided with a lifting plate arranged along the axial direction of the furnace tube.

7. The dust-reducing 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.

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

9. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, Along the direction from the furnace head end to the furnace tail end, the furnace tube is provided with a heating section and a cooling section in sequence; the furnace tail end is also provided with a discharge port.

10. The dust-reducing rotary reduction furnace according to claim 1, characterized in that, It also includes a dust collection device, a cooling device, a collection device, and a hydrogen scrubbing device connected in sequence; The furnace head end is also provided with a hydrogen outlet, and the dust collection device is connected to the hydrogen outlet.

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