Nitrogen circulation device for nitrogen atomization spherical aluminum powder production

Abstract

The utility model relates to a nitrogen circulating device for producing nitrogen atomized spherical aluminum powder, which comprises a support, a horizontal nitrogen tank and a vertical filtering tank, and is technically characterized in that a concentric inner container is arranged in the horizontal nitrogen tank, and an annular heat storage cavity is formed between the concentric inner container and the horizontal nitrogen tank; a horizontal partition plate is arranged in the lower portion of the concentric inner container, a gas distribution cavity is formed between the horizontal partition plate and the bottom of the concentric inner container, a plurality of gas distribution holes are evenly formed in the horizontal partition plate, and the gas distribution holes are communicated with the gas distribution cavity. An outlet pipeline of the vertical filtering tank is communicated with the gas distribution cavity, an axial through pipe is arranged in the middle of the concentric inner container, a heating assembly is arranged in the axial through pipe, and an ash discharging structure is arranged on the bottom face of the horizontal nitrogen tank. According to the device, production waste heat is fully utilized, continuity of recycled nitrogen is guaranteed, rapid and uniform mixing of backflow nitrogen and nitrogen in the nitrogen tank is guaranteed, and recycling is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum powder production equipment technical field, concretely relates to a nitrogen gas recycling device for nitrogen gas atomization spherical aluminum powder production. BACKGROUND

[0002] At present, the aluminum powder production equipment generally adopts the nitrogen gas atomization method, and the nitrogen gas atomization method consumes a large amount of nitrogen gas, so that the nitrogen gas recycling system is usually used to realize the recycling of nitrogen gas.

[0003] CN 210023789 U discloses a nitrogen gas recycling device for nitrogen gas atomization spherical aluminum powder production, which comprises a nitrogen tank, a sleeve pipe, a collecting cavity, a hot gas pipe and an air outlet pipe connected to the atomization chamber, and a back gas pipe and an air inlet pipe connected to the storage tank, the nitrogen tank is provided with a heating rod and a high-pressure gas pump, the nitrogen tank is connected with the hot gas pipe through the high-pressure gas pump, the air outlet pipe is communicated to the collecting cavity after penetrating through the inside of the sleeve pipe, the air inlet pipe is communicated with the collecting cavity, and the back gas pipe is communicated to the sleeve pipe. The sleeve pipe is communicated with the inside of the nitrogen tank. The nitrogen gas in the nitrogen tank of the nitrogen gas recycling device is temporarily stored in the storage tank after being used in the atomization chamber, and is returned to the nitrogen tank for reuse when needed, so that the recycling of nitrogen gas is realized, and waste of nitrogen gas is avoided. The heat in the high-temperature nitrogen gas discharged from the atomization chamber can be absorbed by the nitrogen gas returned by the storage tank, on the one hand, the high-temperature nitrogen gas is cooled for easy storage, and on the other hand, the reused nitrogen gas has a certain temperature, so that the energy loss required for heating is reduced.

[0004] However, the device still has the following problems: 1. The sleeve pipe is used for heat exchange, but the sleeve pipe has poor heat storage performance, resulting in low utilization rate of nitrogen gas waste heat; 2. The anti-static filter cloth is arranged at the inlet end of the back gas pipe, which is beneficial to filtering out the residual aluminum powder in the nitrogen gas, but the filter aperture of the anti-static filter cloth is small and is easily blocked by the aluminum powder, resulting in poor ventilation; 3. The backflow nitrogen gas in the sleeve pipe is directly introduced into the nitrogen tank, which is not conducive to uniform mixing with the original nitrogen gas in the nitrogen tank, resulting in uneven temperature and being not conducive to recycling. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a nitrogen gas recycling device for nitrogen gas atomization spherical aluminum powder production, which solves the above problems and has reasonable structure and reliable use. On the one hand, the production waste heat is fully utilized, on the other hand, the continuity of the reused nitrogen gas is ensured, and the rapid and uniform mixing of the backflow nitrogen gas and the nitrogen gas in the nitrogen tank is ensured, which is beneficial to recycling.

[0006] The technical scheme of the utility model is as follows:

[0007] A nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder includes a support, a horizontal nitrogen tank located above the support, and a vertical filter tank located beside the horizontal nitrogen tank. The key technical features are: the horizontal nitrogen tank has a concentric inner liner, forming an annular heat storage cavity between the concentric inner liner and the horizontal nitrogen tank; a reflux nitrogen inlet is located at a lower axial end of the annular heat storage cavity, and a reflux nitrogen outlet is located at a higher axial end of the annular heat storage cavity; the reflux nitrogen outlet utilizes… The vertical filter tank is connected to the inlet of the vertical filter tank via a transition pipe. A horizontal baffle is built into the lower part of the concentric inner tank. An air distribution chamber is formed between the horizontal baffle and the bottom of the concentric inner tank. Multiple air distribution holes are evenly provided on the horizontal baffle. The outlet pipe of the vertical filter tank is connected to the air distribution chamber. An axial through pipe is provided in the middle of the concentric inner tank and a heating component is provided in the axial through pipe. A nitrogen outlet is provided at the high end of the end face of the concentric inner tank. The bottom surface of the horizontal nitrogen tank is provided with an ash discharge structure.

[0008] The aforementioned nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder includes a vertical filter tank with a concentric vertical inner cylinder. An annular gas storage space is formed between the vertical inner cylinder and the vertical filter tank. A group of ventilation holes is evenly provided on the side wall of the vertical inner cylinder. A filter screen layer is wrapped around the outside of the vertical inner cylinder. The end of the transition pipe is inserted into the vertical inner cylinder from the top surface of the vertical filter tank. The outlet pipe of the vertical filter tank is connected to the annular gas storage space.

[0009] The nitrogen circulation device for producing nitrogen-atomized spherical aluminum powder described above is equipped with a flow regulating valve and a check valve on the outlet pipe of the vertical filter tank.

[0010] The nitrogen circulation device for producing nitrogen-atomized spherical aluminum powder described above has a transfer pump installed on the transition pipeline.

[0011] The aforementioned nitrogen circulation device for the production of nitrogen atomized spherical aluminum powder has multiple first annular baffles spaced axially on the outer wall of the concentric inner liner, and multiple second annular baffles spaced axially on the inner wall of the horizontal nitrogen tank. The first and second annular baffles are arranged alternately, and each of the first and second annular baffles forms a heat exchange channel with a continuous S-shaped cross section in the annular heat storage cavity.

[0012] The aforementioned nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder includes an ash removal structure comprising multiple ash removal doors located on the bottom surface of a horizontal nitrogen tank, supporting ribs connected to the bottom surface of the ash removal doors, an integrated support plate connected to each supporting rib, and a lifting cylinder located on the upper surface of the support. The upper end of the cylinder rod of the lifting cylinder is connected and fixed to the lower surface of the integrated support plate. A lower limit support plate for supporting the integrated support plate is also provided inside the support.

[0013] The beneficial effects of this utility model are:

[0014] 1. An annular heat storage chamber is formed between the concentric inner liner and the horizontal nitrogen tank. After the nitrogen involved in aluminum powder production is separated by the separation device, it enters the annular heat storage chamber. The annular heat storage chamber is used to recover waste heat, which is used to assist the nitrogen in the concentric inner liner to be heated to the set process requirements. It also has a heat preservation function. Compared with the existing technology, it significantly improves the utilization rate of nitrogen waste heat.

[0015] 2. Before nitrogen is reused, it is re-filtered using the vertical inner cylinder and filter screen layer in the vertical filter tank. Due to the greatly increased filtration area, it is beneficial to remove residual aluminum powder in the nitrogen, ensuring long-term filtration needs. Smooth ventilation ensures the continuity of nitrogen return.

[0016] 3. After being filtered, the reflux nitrogen first enters the gas distribution chamber, and then enters the concentric inner liner through the gas distribution holes on the horizontal partition. This facilitates uniform mixing with the nitrogen in the concentric inner liner, thereby ensuring the uniformity of the outlet temperature and guaranteeing safe and reliable use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is an external view of the horizontal nitrogen tank of this utility model;

[0019] Figure 3 yes Figure 1 Sectional view along the AA direction.

[0020] In the diagram: 1. Nitrogen outlet, 2. Horizontal nitrogen tank, 3. Second annular baffle, 4. First annular baffle, 5. Concentric inner liner, 6. Transition pipeline, 7. Transfer pump, 8. Vertical filter tank, 9. Filter screen layer, 10. Vertical inner cylinder, 11. Outlet pipeline, 12. Flow regulating valve, 13. Check valve, 14. Horizontal baffle, 15. Integrated support plate, 16. Ash removal door, 17. Support rib, 18. Lower limit support plate, 19. Lifting cylinder, 20. Support, 21. Return nitrogen inlet, 22. Return nitrogen outlet, 23. Axial through pipe. Detailed Implementation

[0021] The present invention will be described in detail with reference to the accompanying drawings.

[0022] like Figures 1-3 As shown, the nitrogen circulation device for the production of nitrogen atomized spherical aluminum powder includes a support 20, a horizontal nitrogen tank 2 located above the support 20, and a vertical filter tank 8 located on the side of the horizontal nitrogen tank 2.

[0023] The horizontal nitrogen tank 2 contains a concentric inner liner 5, forming an annular heat storage cavity between the concentric inner liner 5 and the horizontal nitrogen tank 2. In this embodiment, the outer wall of the concentric inner liner 5 is provided with multiple first annular baffles 4 spaced axially, and the inner wall of the horizontal nitrogen tank 2 is provided with multiple second annular baffles 3 spaced axially. The first annular baffles 4 and second annular baffles 3 are arranged alternately, forming a heat exchange channel with a continuous S-shaped cross-section in the annular heat storage cavity. A reflux nitrogen inlet 21 is provided at the lower end of one axial side of the annular heat storage cavity, and a reflux nitrogen outlet 22 is provided at the higher end of the other axial side of the annular heat storage cavity. The reflux nitrogen outlet 22 is connected to the inlet of the vertical filter tank 8 via a transition pipe 6. In this embodiment, a transfer pump 7 is provided on the transition pipe 6.

[0024] The lower part of the concentric inner liner 5 has a horizontal partition 14, forming an air distribution chamber between the horizontal partition 14 and the bottom of the concentric inner liner 5. The horizontal partition 14 has a plurality of evenly distributed air distribution holes. The outlet pipe 11 of the vertical filter tank 8 is connected to the air distribution chamber. In this embodiment, the vertical filter tank 8 has a vertical inner cylinder 10 concentric with it, forming an annular air storage space between the vertical inner cylinder 10 and the vertical filter tank 8. The side wall of the vertical inner cylinder 10 has evenly distributed groups of ventilation holes. The outer side of the vertical inner cylinder 10 is wrapped with a filter screen layer 9. The end of the transition pipe 6 is inserted into the vertical inner cylinder 10 from the top surface of the vertical filter tank 8. The outlet pipe 11 of the vertical filter tank 8 is connected to the annular air storage space. The outlet pipe 11 of the vertical filter tank 8 is equipped with a flow regulating valve 12 and a one-way valve 13.

[0025] The concentric inner liner 5 has an axial passage pipe 23 in the middle and a heating component (omitted in the figure) in the axial passage pipe 23. The high end of the end face of the concentric inner liner 5 has a nitrogen outlet 1.

[0026] The bottom surface of the horizontal nitrogen tank 2 is provided with an ash discharge structure. In this embodiment, the ash discharge structure includes multiple ash removal doors 16 located on the bottom surface of the horizontal nitrogen tank 2, supporting ribs 17 connected to the bottom surface of the ash removal doors 16, an integrated support plate 15 connected to each supporting rib 17, and a lifting cylinder 19 located on the upper surface of the support 20. The upper end of the cylinder rod of the lifting cylinder 19 is connected and fixed to the lower surface of the integrated support plate 15. The support 20 is further provided with a lower limit support plate 18 for supporting the integrated support plate 15.

[0027] Working principle:

[0028] During operation, the transfer pump 7 is started, and the recycled nitrogen output from the solid-gas separation device enters the annular heat storage chamber through the return nitrogen inlet 21 under the action of the transfer pump 7. The recycled nitrogen flows to the return nitrogen outlet 22 of the annular heat storage chamber through the heat exchange channel. In this process, the waste heat of production is fully utilized.

[0029] Under the action of the transfer pump 7, recycled nitrogen enters the vertical filter tank 8. After being further filtered by the filter screen layer 9 on the outside of the vertical inner cylinder 10, it flows through the outlet pipe 11 to the gas distribution chamber inside the concentric inner liner 5. Finally, it is evenly dispersed in the gas distribution chamber and mixed evenly with the previously stored nitrogen. The mixed nitrogen is then conveyed through the nitrogen outlet 1 of the concentric inner liner 5 to the nitrogen atomization equipment for the production of aluminum powder. During this process, the flow rate of nitrogen can be adjusted by the flow regulating valve 12 to meet the demand for recycled nitrogen, and the one-way valve 13 prevents the reverse flow of nitrogen.

[0030] After long-term operation, some ash will accumulate at the bottom of the annular heat storage chamber. During production maintenance, the lifting cylinder 19 can be used to open each ash cleaning door 16 for cleaning.

[0031] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A nitrogen circulation device for nitrogen atomized spherical aluminum powder production, comprising a support, a horizontal nitrogen tank arranged above the support, and a vertical filter tank arranged at the side of the horizontal nitrogen tank, characterized in that: The horizontal nitrogen tank is provided with a concentric inner container, an annular heat storage cavity is formed between the concentric inner container and the horizontal nitrogen tank, a reflux nitrogen inlet is arranged at a low position on one axial side of the annular heat storage cavity, a reflux nitrogen outlet is arranged at a high position on the other axial side of the annular heat storage cavity, the reflux nitrogen outlet is communicated with the inlet of the vertical filter tank by a transition pipeline, a horizontal partition plate is arranged in the lower part of the concentric inner container, a gas distribution cavity is formed between the horizontal partition plate and the bottom of the concentric inner container, a plurality of gas distribution holes are uniformly arranged on the horizontal partition plate, the outlet pipeline of the vertical filter tank is communicated with the gas distribution cavity, an axial through pipe is arranged in the middle part of the concentric inner container, a heating assembly is arranged in the axial through pipe, a nitrogen outlet is arranged at the high position of the end surface of the concentric inner container, and a dust discharging structure is arranged on the bottom surface of the horizontal nitrogen tank.

2. The nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder according to claim 1, characterized by: The vertical filter tank is provided with a vertical inner cylinder which is concentric with the vertical filter tank, an annular gas storage space is formed between the vertical inner cylinder and the vertical filter tank, a plurality of air vent hole groups are uniformly arranged on the side wall of the vertical inner cylinder, the outer side of the vertical inner cylinder is wrapped with a filter screen layer, the end of the transition pipeline is inserted into the vertical inner cylinder from the top surface of the vertical filter tank, and the outlet pipeline of the vertical filter tank is communicated with the annular gas storage space.

3. The nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder according to claim 1, characterized by: The outlet pipeline of the vertical filter tank is provided with a flow regulating valve and a one-way valve.

4. The nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder according to claim 1, characterized by: The transition pipeline is provided with a transmission pump.

5. The nitrogen circulation device for the production of nitrogen-atomized spherical aluminum powder according to claim 1, characterized by: The outer wall of the concentric inner container is provided with a plurality of first annular baffles which are arranged at intervals along the axial direction, the inner wall of the horizontal nitrogen tank is provided with a plurality of second annular baffles which are arranged at intervals along the axial direction, the first annular baffles and the second annular baffles are arranged alternately, and each first annular baffle and each second annular baffle form a heat exchange channel with a continuous S-shaped cross section in the annular heat storage cavity.

6. The nitrogen circulation device for nitrogen-atomized spherical aluminum powder production according to claim 1, characterized in that: The dust discharging structure comprises a plurality of dust cleaning doors arranged on the bottom surface of the horizontal nitrogen tank, a support rib plate connected to the bottom surface of the dust cleaning door, an integral support plate connected to each support rib plate, and a lifting cylinder arranged on the upper surface of the support base, wherein the upper end of the cylinder rod of the lifting cylinder is connected and fixed to the lower surface of the integral support plate, and the support base is further provided with a lower limiting supporting plate for supporting the integral support plate.

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