Hydrogen pipeline device for reducing oxygen content of molybdenum powder and improving thermal efficiency of reduction furnace

Abstract

According to the hydrogen pipeline device capable of reducing the oxygen content of the molybdenum powder and improving the thermal efficiency of the reduction furnace, before hydrogen is introduced into an inlet of a furnace tube heating furnace, waste heat of the inlet of the furnace tube is utilized, the heat exchanger is combined to preliminarily heat the hydrogen in the first pipeline, and the hydrogen can be generally heated to about 300 DEG C; and after primary heating, hydrogen is introduced into an outlet of the furnace tube, and then the multi-tube heating furnace is used for heating. At the moment, as the hydrogen has obtained waste heat, when the hydrogen is heated again, the capital cost is saved while the heating efficiency is greatly improved. In addition, the cooling device is arranged at the outlet of the furnace tube, the prepared molybdenum powder is rapidly cooled, the molybdenum powder is prevented from being oxidized, and the purity of the molybdenum powder is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of molybdenum powder preparation, and particularly relates to a hydrogen pipeline device which can reduce the oxygen content of molybdenum powder and improve the thermal efficiency of a reduction furnace. Background Art

[0002] At present, the production of molybdenum powder generally adopts the reverse hydrogen high-temperature reduction process, generally using room temperature hydrogen to enter from the outlet of the multi-tube heating furnace, and after passing through the high-temperature zone, return to the hydrogen recovery system from the inlet. In order to further reduce the oxygen content in the product molybdenum powder, in production, it is sometimes necessary to place the reduced molybdenum powder in a multi-tube heating furnace and replenish it with dry hydrogen at a certain temperature and then reduce it. When using high-purity molybdenum dioxide raw materials, strictly controlling the powder making conditions and impurity pollution can produce high-purity molybdenum powder.

[0003] In the prior art, when preparing molybdenum powder, the required temperature is relatively high, and the corresponding energy consumption itself is also relatively high. Hydrogen at room temperature directly enters the multi-tube heating furnace, and the hydrogen is directly heated from room temperature, which further leads to heat loss, resulting in low thermal efficiency of the multi-tube heating furnace and waste of resource costs. In addition, after the preparation of molybdenum powder is completed, the prior art usually allows the molybdenum powder to cool at room temperature. However, due to the high residual temperature at the outlet pipe of the heating furnace, if it cannot be cooled in time, the molybdenum powder is likely to be oxidized again, resulting in an increase in the oxygen content of the molybdenum powder and insufficient purity. Utility Model Content

[0004] The purpose of the utility model is to provide a hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace, so as to solve the problems of low thermal efficiency of the reduction furnace, high resource cost and high purity of the molybdenum powder when preparing molybdenum powder in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace comprises a multi-tube heating furnace, characterized in that the input end of a first pipeline is connected to the hydrogen output end of an external device, and the output end of the first pipeline is connected to the input end of a second pipeline through a heat exchanger; the heat exchanger is arranged on the heating furnace inlet pipeline of the multi-tube heating furnace; the output end of the second pipeline is connected to the heating furnace outlet pipeline of the multi-tube heating furnace;

[0007] The outlet pipe of the heating furnace is provided with a cooling device.

[0008] The utility model also has the following features:

[0009] Furthermore, a branch pipeline is provided on the input end of the first pipeline through a two-way valve, and the output end of the branch pipeline is connected to the heating furnace outlet pipeline of the multi-tube heating furnace.

[0010] Furthermore, the heat exchanger includes a heat exchange pipe surrounding the inlet pipe of the heating furnace.

[0011] Furthermore, the cooling device comprises a cooling water jacket surrounding the outlet pipe of the heating furnace.

[0012] Furthermore, the cooling water jacket seals the cooling water jacket surrounding the outlet pipe of the heating furnace.

[0013] Furthermore, the connection point between the second pipeline and the outlet pipeline of the heating furnace is arranged between the cooling device and the multi-tube heating furnace.

[0014] Compared with the prior art, the utility model has the following technical effects:

[0015] (I) The utility model discloses a hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace. Before the hydrogen is introduced into the inlet of the furnace tube heating furnace, the residual heat at the inlet of the furnace tube is first used to preliminarily heat the hydrogen in the first pipeline in combination with a heat exchanger, which can usually be heated to about 300°C. After the preliminary heating, the hydrogen is introduced into the outlet of the furnace tube and then heated by a multi-tube heating furnace. At this time, since the hydrogen has obtained the residual heat, the heating efficiency is greatly improved when it is heated again, and the capital cost is saved. In addition, a cooling device is provided at the outlet of the furnace tube to quickly cool the prepared molybdenum powder to prevent the molybdenum powder from being oxidized and to ensure the purity of the molybdenum powder.

[0016] (II) The utility model of the hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of the reduction furnace, at the output end of the first pipeline, a two-way valve is used to simultaneously connect the furnace tube outlet and the heat exchanger. Before heat exchange, a small amount of hydrogen is first input into the multi-tube heating furnace to ensure the safe operation of the entire device. At the same time, the cooling device is improved, and a sealed circulating cooling water jacket is used to cool the molybdenum powder, further preventing the molybdenum powder from being oxidized again, which is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace.

[0018] The meanings of the numbers in the figure are: 1. first pipeline; 2. heat exchanger; 3. second pipeline; 4. heating furnace inlet pipeline; 5. heating furnace outlet pipeline; 6. cooling device; 7. two-way valve. DETAILED DESCRIPTION

[0019] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the multi-tube heating furnace is a commonly known multi-tube heating furnace.

[0020] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0021] A hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace comprises a multi-tube heating furnace, wherein the input end of a first pipeline 1 is connected to the hydrogen output end of an external device, and the output end of the first pipeline 1 is connected to the input end of a second pipeline 3 through a heat exchanger 2; the heat exchanger 2 is arranged on a heating furnace inlet pipeline 4 of the multi-tube heating furnace; and the output end of the second pipeline 3 is connected to a heating furnace outlet pipeline 5 of the multi-tube heating furnace.

[0022] A cooling device 6 is provided at the outlet pipe 5 of the heating furnace.

[0023] When in use, first put molybdenum dioxide into a multi-tube heating furnace; connect the input end of the first pipe 1 to the hydrogen output end of the external device, and the hydrogen output from the external device is heated to about 300°C by the heat exchanger using the residual temperature of the heating furnace inlet pipe 4, and then enters the heating furnace outlet pipe 5. When the molybdenum dioxide is reduced by the multi-tube heating furnace to about 1000°C, the gas flows out from the heating furnace inlet pipe 4 and enters the external gas collection device. After the molybdenum dioxide is reduced and becomes molybdenum powder, it is cooled by the cooling device 6 and taken out from the heating furnace outlet pipe 5.

[0024] As a preferred solution of this embodiment, a branch pipeline is provided on the input end of the first pipeline 1 through a two-way valve 7, and the output end of the branch pipeline is connected to the heating furnace outlet pipeline 5 of the multi-tube heating furnace.

[0025] When in use, firstly pass a small amount of hydrogen into the outlet pipe 5 of the heating furnace to allow the hydrogen to enter the multi-tube heating furnace, thereby further ensuring the safe operation of the device.

[0026] Specifically, the heat exchanger 2 includes a plurality of heat exchange pipes surrounding the heating furnace inlet pipe 4 .

[0027] As a preferred solution of this embodiment, the cooling device 6 includes a cooling water jacket surrounding the outlet pipe 5 of the heating furnace.

[0028] Further preferably, the cooling device 6 includes a cooling water jacket sealed around the outlet pipe 5 of the heating furnace to prevent cooling water from leaking out and affecting the normal reaction.

[0029] As a preferred solution of this embodiment, the connection point between the second pipeline and the heating furnace outlet pipeline 5 is set between the cooling water jacket and the multi-tube heating furnace to prevent the hydrogen that has been preliminarily heated from being cooled by the cooling water jacket, thereby improving the thermal efficiency of the device.

Claims

1. A hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace, comprising a multi-tube heating furnace, characterized in that: The input end of the first pipeline (1) is connected to the hydrogen output end of the external device, and the output end of the first pipeline (1) is connected to the input end of the second pipeline (3) through a heat exchanger (2); the heat exchanger (2) is arranged on the heating furnace inlet pipeline (4) of the multi-tube heating furnace; the output end of the second pipeline (3) is connected to the heating furnace outlet pipeline (5) of the multi-tube heating furnace; The heating furnace outlet pipe (5) is provided with a cooling device (6).

2. The hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace as claimed in claim 1, characterized in that: A branch pipeline is provided at the input end of the first pipeline (1) via a two-way valve (7), and the output end of the branch pipeline is connected to the heating furnace outlet pipeline (5) of the multi-tube heating furnace.

3. The hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace as claimed in claim 2, characterized in that: The heat exchanger (2) comprises a heat exchange pipe surrounding the heating furnace inlet pipe (4).

4. The hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace as claimed in claim 2, characterized in that: The cooling device (6) comprises a cooling water jacket surrounding the outlet pipe (5) of the heating furnace.

5. The hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of the reduction furnace as claimed in claim 4, characterized in that: The cooling device (6) comprises a cooling water jacket which is sealed around the outlet pipe (5) of the heating furnace.

6. The hydrogen pipeline device for reducing the oxygen content of molybdenum powder and improving the thermal efficiency of a reduction furnace according to any one of claims 1 to 5, characterized in that: The connection point between the second pipeline (3) and the heating furnace outlet pipeline (5) is arranged between the cooling device (6) and the multi-tube heating furnace.

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