Annealing furnace nitrogen cooling device and annealing furnace

Abstract

The present invention relates to the technical field of annealing furnaces, and in particular to a nitrogen cooling device for annealing furnaces and annealing furnaces. It comprises a first cooler, an oil removal filter, an air inlet pipe and an air outlet pipe arranged outside the annealing furnace; the air inlet pipe is used to connect to the first end of the heating zone of the annealing furnace, and the air outlet pipe is used to connect to the second end of the heating zone; wherein the first end of the heating zone is used to connect to the rapid cooling zone of the annealing furnace; the air inlet pipe is connected to the first cooler, the first cooler is connected to the oil removal filter, and the oil removal filter is connected to the air outlet pipe. In the cooling device of the present application, nitrogen enters the cooling device before entering the rapid cooling zone, and the oil removal filter and the first cooler remove part of the oil mist in the nitrogen, thereby reducing the concentration of oil mist in the heating zone and the rapid cooling zone, and further reducing the source of oil spots; at the same time, the recycling of nitrogen can save a large amount of nitrogen directly discharged to discharge oil mist, which can reduce costs.

Description

Technical Field

[0001] The invention relates to the technical field of annealing furnaces, and in particular to a nitrogen cooling device for an annealing furnace and an annealing furnace. Background Art

[0002] During annealing in a roller bottom annealing furnace, the residual oil attached to the inner surface of the copper tube forms oil mist after being heated in the heating zone, and is directly discharged into the furnace through nitrogen purge. During continuous production, more and more oil mist accumulates in the furnace, and when it reaches a certain concentration, it will seriously affect the penetration of the infrared grating, resulting in inaccurate or failure of the positioning function of the rack. In severe cases, the racks will collide with each other, deflect, and get stuck in the furnace and cannot move forward or backward; and a large amount of nitrogen containing oil mist enters the cooling zone and is cooled again to form oil droplets attached to the surface of the copper tube to form oil spots, resulting in poor product quality.

[0003] At present, the general solution is to increase the amount of nitrogen added to the furnace and the amount of waste gas discharged, relying on the discharge of nitrogen to remove the oil mist, but the effect is not good, and there are still a large number of oil spots on the product surface that cannot be solved; and the nitrogen consumption has increased significantly. At the same time, the increase in nitrogen consumption also increases the amount of electricity required to heat the nitrogen, resulting in the annealing furnace process nitrogen and electricity costs remaining high for a long time, and the oil spots on the product surface have not been effectively solved for a long time. Summary of the invention

[0004] The present application provides a nitrogen cooling device for an annealing furnace. Hot nitrogen containing oil mist entering a rapid cooling zone enters a cooling device before entering the rapid cooling zone. An oil removal filter and a first cooler remove part of the oil mist in the nitrogen, thereby reducing the concentration of oil mist in the heating zone and in the rapid cooling zone, thereby reducing the source of oil spots. At the same time, the recycling of nitrogen can save a large amount of nitrogen directly discharged to discharge the oil mist, thereby reducing costs.

[0005] In order to achieve the above-mentioned object, the present application provides a nitrogen cooling device for an annealing furnace, comprising: a first cooler arranged outside the annealing furnace, an oil removal filter, an air inlet pipe and an air outlet pipe;

[0006] The air inlet pipe is used to connect with the first end of the heating zone of the annealing furnace, and the air outlet pipe is used to connect with the second end of the heating zone; wherein the first end of the heating zone is used to connect with the fast cooling zone of the annealing furnace;

[0007] The air inlet pipe is in communication with the first cooler, the first cooler is in communication with the oil removal filter, and the oil removal filter is in communication with the air outlet pipe.

[0008] In the annealing furnace nitrogen cooling device of the present application, the hot nitrogen containing oil mist in the heating zone will enter the outlet pipe before entering the rapid cooling zone, and enter the first cooler through the outlet pipe. The first cooler cools the nitrogen containing oil mist once, so that part of the oil mist can be condensed, and then enters the oil removal filter. The oil removal filter removes part of the oil mist in the nitrogen, and the nitrogen can re-enter the heating zone, thereby reducing the oil mist concentration in the heating zone and the rapid cooling zone, thereby reducing the source of oil spots; at the same time, the recycling of nitrogen can save a large amount of nitrogen directly discharged to discharge oil mist, which can reduce the cost of this process.

[0009] Preferably, it also includes two flanges for connecting the air inlet duct and the air outlet duct in the heating zone.

[0010] Preferably, a second cooler is further included, and the second cooler is respectively connected to the air inlet pipe, the first cooler, the oil removal filter and the air outlet pipe.

[0011] Preferably, the second cooler includes a first pipe and a second pipe sleeved outside the first pipe, the first pipe is connected to the air intake pipe and the first cooler, and the second pipe is connected to the oil removal filter and the air outlet pipe.

[0012] Preferably, the method further comprises a centrifugal fan disposed between the oil removal filter and the second pipeline.

[0013] Preferably, the second cooler comprises a third pipe and a fourth pipe sleeved outside the third pipe;

[0014] The third pipeline is connected to the oil removal filter and the first pipeline, and the fourth pipeline is provided with an inlet and an outlet for entering the coolant.

[0015] Preferably, the inlet is located at the bottom of the fourth conduit, and the outlet is located at the top of the fourth conduit.

[0016] Preferably, the cooling liquid is water.

[0017] The present application also provides an annealing furnace, comprising the above-mentioned annealing furnace nitrogen cooling device, wherein the heating zone may include a plurality of sub-heating zones, and the air inlet and outlet pipes are connected to the sub-heating zones arranged at the end and connected to the rapid cooling zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application;

[0019] Figure 2 This is a front view of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application;

[0020] Figure 3 This is a flow chart of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application.

[0021] Icons: 10-first cooler; 11-inlet; 12-outlet; 20-oil removal filter; 30-inlet pipe; 40-outlet pipe; 50-flange; 60-centrifugal fan; 70-second cooler. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the invention clearer, the technical solution in the embodiments of the invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Generally, the components of the embodiments of the invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the embodiments of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the invention can be understood according to specific circumstances.

[0028] Example 1

[0029] Figure 1 This is a schematic structural diagram of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application; Figure 2 This is a front view of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application; Figure 3 This is a flow chart of a nitrogen cooling device for an annealing furnace according to an embodiment of the present application. Figure 1-3 As shown, the present application provides a nitrogen cooling device for an annealing furnace, comprising: a first cooler 10 arranged outside the annealing furnace, an oil removal filter 20, an air inlet pipe 30 and an air outlet pipe 40;

[0030] The air inlet pipe 30 is used to be connected to the first end of the heating zone of the annealing furnace, and the air outlet pipe 40 is used to be connected to the second end of the heating zone; wherein the first end of the heating zone is used to be connected to the fast cooling zone of the annealing furnace;

[0031] The air intake pipe 30 is in communication with the first cooler 10 , the first cooler 10 is in communication with the oil removal filter 20 , and the oil removal filter 20 is in communication with the air outlet pipe 40 .

[0032] In the annealing furnace nitrogen cooling device of the present application, the hot nitrogen containing oil mist in the heating zone will enter the outlet pipe 40 before entering the rapid cooling zone, and enter the first cooler 10 through the outlet pipe 40. The first cooler 10 cools the nitrogen containing oil mist once, so that part of the oil mist can be condensed, and then enters the oil removal filter 20. The oil removal filter 20 removes part of the oil mist in the nitrogen, and the nitrogen can re-enter the heating zone, thereby reducing the oil mist concentration in the heating zone and the rapid cooling zone, thereby reducing the source of oil spots; at the same time, the recycling of nitrogen can save a large amount of nitrogen directly discharged to discharge oil mist, which can reduce the cost of this process.

[0033] It should be noted that the air inlet pipe 30 is used to introduce the nitrogen containing oil mist in the heating zone into the cooling zone device, and the air outlet pipe 40 is used to re-input the nitrogen with a certain amount of oil mist removed into the heating zone.

[0034] The oil removal filter 20 meets the conditions of nominal flow rate 600m 3 , pressure loss 4000pa, temperature resistance of 100℃, filter model is JMGLQ, nominal flow rate 650m / s, diameter 150mm, pressure loss 4000pa, working temperature ≤100℃, filtration accuracy 2μm, connection method is HG / T20592PN16RF.

[0035] As an optional method, two flanges 50 are also included for connecting the air inlet pipe 30 and the air outlet pipe 40 in the heating area.

[0036] In this embodiment, the flange 50 is used to fix the auxiliary tube flange 50 arranged on the heating zone, and the two flanges 50 are conveniently connected to the air inlet pipe 30 and the air outlet pipe 40. When the two flanges 50 are connected to the heating zone, there is no need to reopen the opening on the heating zone, that is, there is no need to reopen the opening on the annealing furnace.

[0037] As an optional manner, a second cooler 70 is further included, and the second cooler 70 is respectively connected to the intake pipe 30, the first cooler 10, the oil removal filter 20 and the outlet pipe 40.

[0038] In this embodiment, the second cooler 70 is used to cool down the nitrogen containing oil mist that has just entered the intake pipe 30 .

[0039] As an optional method, the second cooler 70 includes a first pipe and a second pipe sleeved outside the first pipe, the first pipe is connected to the intake pipe 30 and the first cooler 10, and the second pipe is connected to the oil removal filter 20 and the outlet pipe 40.

[0040] The lengths of the first pipeline and the second pipeline are selected to be greater than 2.5 m.

[0041] In this embodiment, when the nitrogen containing oil mist in the heating zone enters the first pipe from the air inlet pipe 30, the nitrogen with part of the oil mist removed flows through the second pipe toward the air outlet pipe 40. At this time, the flow direction of the nitrogen containing oil mist is opposite to the flow direction of the nitrogen with part of the oil mist removed, and the temperature of the nitrogen with part of the oil mist removed is lower than the temperature of the nitrogen containing oil mist passing through the first pipe, thereby performing the first cooling of the nitrogen containing oil mist, and this cooling makes the temperature of the nitrogen containing oil mist reach about 150 degrees Celsius.

[0042] As an optional manner, a centrifugal fan 60 is further included and arranged between the oil removal filter 20 and the second pipeline.

[0043] In this embodiment, since the centrifugal fan 60 is connected to the oil removal filter 20 and the second pipeline, when the centrifugal fan 60 is working, after the oil mist is removed by the oil removal filter 20, the nitrogen enters the second pipeline under the action of the centrifuge, so as to ensure the flow of gas in the cooling device and the amount of nitrogen containing oil mist entering the cooling device through the air intake pipe 30. Moreover, this arrangement can increase the temperature of the nitrogen re-entering the heating zone, which not only reduces the temperature of the nitrogen containing oil mist, but also increases the temperature of the nitrogen entering the heating zone, thereby improving the reuse rate of resources.

[0044] It should be noted that the centrifugal fan 60 should meet the fan full pressure of 4600pa, the flow rate of 600 cubic meters per hour, the fan model is 8-09-4.5A, the motor is 3KW-2P, and the heat resistance is 200℃.

[0045] As an optional manner, the second cooler 70 includes a third pipe and a fourth pipe sleeved outside the third pipe;

[0046] The third pipeline is connected to the oil removal filter 20 and the first pipeline, and the fourth pipeline is provided with an inlet 11 and an outlet 12 for the coolant to enter.

[0047] In this embodiment, the third pipe is connected to the first pipe. When the nitrogen containing oil mist passes through the first pipe for the first cooling, it enters the third pipe. When the nitrogen containing oil mist flows in the third pipe, the coolant enters the coolant inlet 11 of the fourth pipe. In the process of flowing out through the outlet 12, the nitrogen containing oil mist in the third pipe is cooled for the second time. The second cooling reduces the temperature of the nitrogen containing oil mist to about 25 degrees Celsius.

[0048] As an optional manner, the inlet 11 is located at the bottom of the fourth pipe, and the outlet 12 is located at the top of the fourth pipe.

[0049] In this embodiment, the coolant inlet 11 is located below the fourth pipe, and the outlet 12 is located above the fourth channel, wherein the direction from bottom to top is the direction of fluid flow in the third channel. In this arrangement, the flow direction of the coolant is opposite to the flow direction of the fluid in the third channel, so as to improve the cooling efficiency of the fluid in the third channel.

[0050] As an optional manner, the coolant is water.

[0051] In this embodiment, water is selected as the coolant to reduce the cooling cost. Moreover, after the water cools the fluid in the third channel, the temperature of the water increases, and the heated water can be reused.

[0052] Example 2

[0053] The present application also provides an annealing furnace, including the annealing furnace nitrogen cooling device as described above, wherein the heating zone may include multiple sub-heating zones, and the air inlet pipe 30 and the air outlet pipe 40 are connected to the sub-heating zones arranged at the end and connected to the fast cooling zone.

[0054] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A nitrogen cooling device for an annealing furnace, characterized in that: include: A first cooler, an oil removal filter, an air inlet pipe and an air outlet pipe arranged outside the annealing furnace; The air inlet pipe is used to connect to the first end of the heating zone of the annealing furnace, and the air outlet pipe is used to connect to the second end of the heating zone; wherein the first end of the heating zone is used to connect to the fast cooling zone of the annealing furnace; The first cooler is connected to the oil removal filter; It also includes a second cooler, which is respectively connected to the air inlet pipe, the first cooler, the oil removal filter and the air outlet pipe; The second cooler includes a first pipe and a second pipe sleeved outside the first pipe, the first pipe is connected to the air inlet pipe and the first cooler at both ends, and the second pipe is connected to the oil removal filter and the air outlet pipe at both ends.

2. The nitrogen cooling device for an annealing furnace according to claim 1, characterized in that: Also included are two flanges for connecting the air inlet duct and the air outlet duct to the heating zone.

3. The nitrogen cooling device for an annealing furnace according to claim 1, characterized in that: It also includes a centrifugal fan disposed between the oil removal filter and the second pipeline.

4. The nitrogen cooling device for an annealing furnace according to claim 1, characterized in that: The first cooler includes a third pipe and a fourth pipe sleeved outside the third pipe; The third pipeline is connected to the oil removal filter and the first pipeline, and the fourth pipeline is provided with an inlet and an outlet for entering the coolant.

5. The nitrogen cooling device for an annealing furnace according to claim 4, characterized in that: The inlet is located at the bottom of the fourth conduit, and the outlet is located at the top of the fourth conduit.

6. The nitrogen cooling device for an annealing furnace according to claim 4, characterized in that: The coolant is water.

7. An annealing furnace, characterized in that: It comprises the nitrogen cooling device for the annealing furnace as described in any one of claims 1 to 6.

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