Roller hearth furnace nitrogen recovery filtering device

Abstract

The utility model relates to gas recovery filter technical field, concretely relates to a roller hearth furnace nitrogen recovery filter device, and the top side of filter jar is connected with the air inlet pipe, and the top of filter jar is connected with the air outlet pipe, and the filter jar is equipped with filter bowl, and the one end of air inlet pipe is connected in filter jar is connected in the top side of filter bowl, and the outside of filter bowl and the inside of filter jar leave the gap between, and the recovery nitrogen enters the top portion in filter bowl along air inlet pipe, and filters through filter unit, and the oil mist in recovery nitrogen is mainly filtered and removed, and solid impurities, volatile organic compounds and odor etc. are intercepted, and the filtered recovery nitrogen flows out along filter bowl bottom end, and converges upwards through the gap, and finally converges to the air outlet pipe at the top of filter jar and is discharged, and part of residual oil mist condenses and flows down along the tank wall, realize the efficient filtration of recovery nitrogen, avoid the failure or misalignment of oxygen detection instrument in the rear end due to the heavy oil mist in recovery nitrogen.

Description

Technical Field

[0001] This utility model relates to the field of gas recovery and filtration technology, and in particular to a nitrogen recovery and filtration device for a roller hearth furnace. Background Technology

[0002] In the current copper tube production process, after various processing steps, when the tube is finally wound into a semi-finished product ready for shipment by a winding machine, it needs to be heated in a roller hearth furnace to remove the oil inside and outside the tube and change the hardness of the material. During the heating process, considering the oxidation reaction that occurs when oxygen reacts with the copper tube, nitrogen is used as a protective gas. However, the heated nitrogen, mixed with oil from the copper tube, needs to be discharged. Since the nitrogen can also be recycled, a nitrogen recovery system could be installed. This system would need to be connected to oxygen detection instruments such as an oxygen controller to ensure that no oxygen is mixed in when the nitrogen is recycled. However, in actual use, the oxygen controller often fails or becomes inaccurate due to the heavy oil mist in the recovered nitrogen. Furthermore, the replacement cost of oxygen controllers and other oxygen detection instruments is high, maintenance is troublesome, and frequent monthly malfunctions render the nitrogen recovery system unusable, thus affecting production efficiency and costs. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a nitrogen recovery and filtration device for a roller hearth furnace to solve one or more of the problems mentioned above.

[0004] To achieve the above objectives, this utility model provides a nitrogen recovery and filtration device for a roller hearth furnace, comprising a filter tank:

[0005] An air inlet pipe is connected to one side of the top of the filter canister, and an air outlet pipe is connected to the top of the filter canister. A filter cylinder is installed inside the filter canister. One end of the air inlet pipe that enters the filter canister is connected to the top side of the filter cylinder. The top of the filter cylinder is initially closed, and the bottom of the filter cylinder is open. A gap is left between the outer side of the filter cylinder and the inner side of the filter canister.

[0006] The filter cartridge is equipped with a filter unit. The recovered nitrogen enters the top of the filter cartridge through the inlet pipe and is filtered by the filter unit. The filtered recovered nitrogen flows out through the bottom of the filter cartridge, and then flows upward through the gap and is cooled before flowing out through the outlet pipe.

[0007] Preferably, the filter tank is designed as a vertical cylindrical shape.

[0008] Preferably, the outer side of the air intake pipe is covered with an insulation layer.

[0009] Preferably, a jacket is provided on the outer side of the middle part of the filter tank, and a cooling medium is circulated in the jacket to cool the recovered nitrogen flowing in the gap.

[0010] Preferably, an oil drain pipe is connected to the bottom of the filter tank.

[0011] Preferably, the top of the filter canister is detachably connected to a canister cover. The filter cylinder includes a fixed outer cylinder fixedly connected to one end of the air inlet pipe and an inner cylinder vertically inserted into the fixed outer cylinder. The top side of the inner cylinder has an opening communicating with the air inlet pipe. Both the fixed outer cylinder and the inner cylinder are designed as vertical cylinders. The top and bottom ends of the fixed outer cylinder and the bottom end of the inner cylinder are all open. The top of the inner cylinder is closed and connected to a canister cover.

[0012] Preferably, a through groove communicating with the air intake pipe is provided on one side of the top of the fixed outer cylinder. A sealing plate is vertically inserted into the through groove. A connecting rod is connected to the top of the sealing plate. The bottom of the sealing plate is elastically connected to the through groove. When the inner cylinder is inserted into the fixed outer cylinder, the cylinder cover pushes the connecting rod downward, causing the sealing plate to move downward along the through groove so that the air intake pipe, the through groove, and the through port are connected in sequence. When the inner cylinder is taken out upward, the sealing plate springs up and seals one end of the air intake pipe.

[0013] Preferably, a limiting groove is provided at the bottom of the cylinder cover. When the inner cylinder is inserted and installed, the top end of the connecting rod is inserted into the limiting groove, with the opening facing the end of the air intake pipe.

[0014] Preferably, the filter unit includes multiple layers of activated carbon plates arranged at intervals along the inside of the inner cylinder to remove oil mist from the recovered nitrogen.

[0015] The beneficial effects of this utility model are as follows: An air inlet pipe is connected to one side of the top of the filter tank, and an air outlet pipe is connected to the top of the filter tank. A filter cylinder is installed inside the filter tank. One end of the air inlet pipe is connected to the top side of the filter cylinder. A gap is left between the outer side of the filter cylinder and the inner side of the filter tank. The recovered nitrogen enters the top of the filter cylinder along the air inlet pipe and is filtered by the filter unit. The filter mainly removes oil mist from the recovered nitrogen and intercepts solid impurities, volatile organic compounds, and odors. The filtered recovered nitrogen flows out along the bottom of the filter cylinder and flows upward through the gap. Finally, it flows out through the air outlet pipe at the top of the filter tank. During the flow, the recovered nitrogen comes into contact with the tank wall of the filter tank over a large area. The tank wall naturally dissipates heat and cools the nitrogen, causing some residual oil mist to condense and flow down the tank wall. This achieves efficient filtration of the recovered nitrogen, especially efficient removal of oil mist. This prevents the oxygen detection instrument at the downstream end from failing or becoming inaccurate due to heavy oil mist in the recovered nitrogen and is beneficial for the heating protection of the copper tube. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0018] Figure 2 This is a schematic diagram of the internal structure of the filter tank of this utility model;

[0019] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure when the inner cylinder is removed upwards in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the inner cylinder of this utility model when it is completely removed.

[0022] Figure 6 This is a schematic diagram of the inner cylinder of this utility model;

[0023] Figure 7 This is a schematic diagram of the opening structure of this utility model.

[0024] The diagram is marked as follows:

[0025] 1. Filter canister; 2. Inlet pipe; 3. Outlet pipe; 4. Filter cylinder; 41. Fixed outer cylinder; 42. Inner cylinder; 43. Port; 44. Cylinder cover; 45. Through groove; 5. Gap; 6. Oxygen detector; 7. Activated carbon plate; 8. Oil drain pipe; 9. Canister cover; 10. Sealing plate; 11. Connecting rod; 12. Limiting groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] A nitrogen recovery and filtration device for a roller hearth furnace includes a filter tank 1. An inlet pipe 2 is connected to one side of the top of the filter tank 1, and an outlet pipe 3 is connected to the top of the filter tank 1. A filter cylinder 4 is provided inside the filter tank 1. One end of the inlet pipe 2, which passes through the filter tank 1, is connected to the top side of the filter cylinder 4. The top of the filter cylinder 4 is initially closed, while the bottom of the filter cylinder 4 is open. A gap 5 is left between the outer side of the filter cylinder 4 and the inner side of the filter tank 1. A filtration unit is provided inside the filter cylinder 4. The recovered nitrogen enters the top of the filter cylinder 4 along the inlet pipe 2 and is filtered by the filtration unit. The filtered recovered nitrogen flows out along the bottom of the filter cylinder 4, and then flows upward and is cooled through the gap 5 before flowing out through the outlet pipe 3.

[0029] like Figure 1 , Figure 2 As shown, this utility model is based on an existing gas recovery filtration system, including a filter tank 1. Preferably, due to space limitations, the filter tank 1 can be designed as a vertical cylindrical shape. An air inlet pipe 2 is connected to one side of the top of the filter tank 1, and an air outlet pipe 3 is connected to the top of the filter tank 1. One end of the air outlet pipe 3 can be connected in sequence to a conventional air pump for pumping out the filtered recovered nitrogen, and an oxygen detector 6 for detecting the oxygen content in the filtered recovered nitrogen to ensure reliable protection gas when the copper tube is heated. A filter cylinder 4 is provided inside the filter tank 1. One end of the air inlet pipe 2, which enters the filter tank 1, is connected to the top side of the filter cylinder 4. The top of the filter cylinder 4 is initially closed, and the bottom of the filter cylinder 4 is open. A gap 5 is left between the outer side of the filter cylinder 4 and the inner side of the filter tank 1. The filter cylinder 4 is equipped with... The system includes a filtration unit, which can be made of conventional materials such as activated carbon. The recovered nitrogen enters the top of the filter cylinder 4 through the inlet pipe 2 and is filtered by the filtration unit. This filtration primarily removes oil mist from the recovered nitrogen, as well as intercepts solid impurities, volatile organic compounds, and odors. The filtered recovered nitrogen flows out from the bottom of the filter cylinder 4 and converges upwards through gap 5, ultimately flowing out through the outlet pipe 3 at the top of the filter tank 1. During this convergence, the recovered nitrogen makes extensive contact with the tank wall of the filter tank 1, allowing for natural heat dissipation and cooling. This condenses some residual oil mist, which then flows down the tank wall, achieving highly efficient filtration of the recovered nitrogen, especially effectively removing oil mist. This prevents the downstream oxygen detector 6 from malfunctioning or becoming inaccurate due to heavy oil mist in the recovered nitrogen, and also provides heating protection for the copper tubes.

[0030] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2As shown, the outer side of the air intake pipe 2 can also be covered with a heat insulation layer. The heat insulation layer can adopt existing conventional structures such as heat insulation cotton wrapped with tin foil or heat insulation heating belt wrapped with tin foil. Considering that activated carbon has a high removal rate for volatile organic compounds, oil mist and other gaseous substances, but a low removal rate for liquid oil droplets, the recovered nitrogen gas maintains its own temperature in the initial air intake stage of the air intake pipe 2 and filter cartridge 4, avoiding the oil mist from naturally cooling and condensing during the filtration stage, which is conducive to further improving the filtration efficiency.

[0031] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 As shown, a jacket can also be provided on the outer side of the middle part of the filter tank 1. Cooling medium is circulated in the jacket to cool the recovered nitrogen flowing at the gap 5, thereby further facilitating the upward flow of the filtered recovered nitrogen. Some residual oil mist condenses and flows down, thereby further improving the filtration efficiency.

[0032] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 As shown, the bottom of the filter tank 1 is connected to an oil drain pipe 8, which is used to collect the oil mist condensate flowing down from the filter tank 1.

[0033] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, a lid 9 is detachably connected to the top of the filter canister 1. Specifically, the lid 9 and the filter canister 1 can be fixedly connected via a flange. The filter cylinder 4 includes a fixed outer cylinder 41 fixedly connected to one end of the air inlet pipe 2 and an inner cylinder 42 vertically inserted into the fixed outer cylinder 41. Figure 7 As shown, the top side of the inner cylinder 42 is provided with an opening 43 that communicates with the air inlet pipe 2. The outer cylinder 41 and the inner cylinder 42 are both designed as vertical cylinders. The top end of the outer cylinder 41, the bottom end of the outer cylinder 41 and the bottom end of the inner cylinder 42 are all open. The top end of the inner cylinder 42 is closed and connected with a cylinder cover 44.

[0034] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, a through groove 45 communicating with the air inlet pipe 2 is provided on one side of the top of the fixed outer cylinder 41. A sealing plate 10 is vertically inserted into the through groove 45. A connecting rod 11 is connected to the top of the sealing plate 10. The bottom of the sealing plate 10 is elastically connected to the through groove 45. Specifically, the through groove 45, the through port 43, and the sealing plate 10 can be designed in an arc shape to adapt to the filter cylinder 4. The connecting rod 11 can be in the shape of a vertical straight rod. The top of the can lid 9 and the cylinder lid 44 can also be provided with lifting lugs.

[0035] Thus, when the inner cylinder 42 is inserted into the fixed outer cylinder 41, as Figure 2 , Figure 3 As shown, the cylinder cover 44 pushes the connecting rod 11 downwards, causing the sealing plate 10 to move downwards along the through groove 45, so that the air inlet pipe 2, through groove 45, and through port 43 are connected in sequence. When the filter device needs to be replaced or maintained after a certain period of use, it can be lifted by hooking the lifting lugs of the can cover 9 with a crane or other hoisting equipment in the workshop, and then hooking the lifting lugs of the cylinder cover 44 to lift the inner cylinder 42. When the inner cylinder 42 is taken out upwards, as shown... Figure 4 , Figure 5 As shown, the sealing plate 10 pops up and seals one end of the air inlet pipe 2, thereby preventing a large amount of recovered nitrogen in the air inlet pipe 2 from leaking directly into the workshop environment. Even if one end of the air inlet pipe 2 is equipped with an on / off valve, there is an unavoidable gap between the on / off valve and the port 43, which also prevents the recovered nitrogen at the front end of the port 43 from leaking directly into the workshop environment. The recovered nitrogen in the filter tank 1 has already been filtered by the filter cartridge 4, so it has little impact on the workshop environment.

[0036] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, a limiting groove 12 is provided at the bottom of the cylinder cover 44. When the inner cylinder 42 is inserted and installed, the top end of the connecting rod 11 is inserted into the limiting groove 12, and the port 43 faces one end of the air intake pipe 2. Thus, when installed in place, the port 43 automatically faces one end of the air intake pipe 2, avoiding misalignment between the port 43 and one end of the air intake pipe 2 during installation / maintenance.

[0037] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the filter unit includes multiple layers of activated carbon plates 7 arranged at intervals along the inside of the inner cylinder 42. It is mainly used to remove oil mist from the recovered nitrogen, as well as to intercept solid impurities, volatile organic compounds and odors.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

Claims

1. A nitrogen recovery and filtration device for a roller hearth furnace, comprising a filter tank (1), characterized in that: An air inlet pipe (2) is connected to the top side of the filter canister (1), and an air outlet pipe (3) is connected to the top of the filter canister (1). A filter cylinder (4) is provided inside the filter canister (1). One end of the air inlet pipe (2) that enters the filter canister (1) is connected to the top side of the filter cylinder (4). The top of the filter cylinder (4) is initially closed, and the bottom of the filter cylinder (4) is open. A gap (5) is left between the outer side of the filter cylinder (4) and the inner side of the filter canister (1). The filter cylinder (4) is equipped with a filter unit. The recovered nitrogen enters the top of the filter cylinder (4) through the inlet pipe (2) and is filtered by the filter unit. The filtered recovered nitrogen flows out through the bottom of the filter cylinder (4), and flows upward through the gap (5) for cooling, and then flows out through the outlet pipe (3).

2. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 1, characterized in that, The filter tank (1) is designed as a vertical cylindrical shape.

3. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 1, characterized in that, The outer side of the air intake pipe (2) is covered with a heat insulation layer.

4. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 1, characterized in that, The filter tank (1) is provided with a jacket on the outer side of the middle part, and a cooling medium is circulated in the jacket to cool the recovered nitrogen flowing in the gap (5).

5. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 1, characterized in that, The bottom end of the filter tank (1) is connected to an oil drain pipe (8).

6. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 1, characterized in that, The top of the filter canister (1) is detachably connected to a canister cover (9). The filter cylinder (4) includes a fixed outer cylinder (41) fixedly connected to one end of the air inlet pipe (2) and an inner cylinder (42) vertically inserted into the fixed outer cylinder (41). The top side of the inner cylinder (42) is provided with a port (43) communicating with the air inlet pipe (2). The fixed outer cylinder (41) and the inner cylinder (42) are both designed as vertical cylinders. The top end of the fixed outer cylinder (41), the bottom end of the fixed outer cylinder (41) and the bottom end of the inner cylinder (42) are all open. The top end of the inner cylinder (42) is closed and connected to a cylinder cover (44).

7. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 6, characterized in that, The top side of the fixed outer cylinder (41) is provided with a through groove (45) that communicates with the air inlet pipe (2). A sealing plate (10) is vertically inserted into the through groove (45). A connecting rod (11) is connected to the top of the sealing plate (10). The bottom end of the sealing plate (10) is elastically connected to the through groove (45). When the inner cylinder (42) is inserted into the fixed outer cylinder (41), the connecting rod (11) is pushed down by the cylinder cover (44), which drives the sealing plate (10) to move down along the through groove (45) so that the air inlet pipe (2), the through groove (45), and the through port (43) are connected in sequence. When the inner cylinder (42) is taken out upward, the sealing plate (10) springs up and seals one end of the air inlet pipe (2).

8. The nitrogen recovery and filtration device for a roller hearth furnace according to claim 7, characterized in that, The bottom end of the cylinder cover (44) is provided with a limiting groove (12). When the inner cylinder (42) is inserted and installed, the top end of the connecting rod (11) is inserted into the limiting groove (12), and the opening (43) faces the end of the air inlet pipe (2).

9. A nitrogen recovery and filtration device for a roller hearth furnace according to claim 6, characterized in that, The filter unit includes multiple layers of activated carbon plates (7) arranged at intervals along the inside of the inner cylinder (42) to remove oil mist from the recovered nitrogen.

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