Central throat pipe protection device

Abstract

The invention provides a central throat pipe protection device, and relates to the technical field of blast furnaces, the central throat pipe protection device comprises a first protection section and a second protection section, the first protection section is a cone of a hollow structure, the small-diameter end of the two ends of the first protection section is connected with the second protection section, and the second protection section is a hollow cylinder; the length of the second protection section is smaller than that of the central throat pipe, the outer diameter of the second protection section is consistent with the inner diameter of the central throat pipe, and when the central throat pipe protection device is placed in the central throat pipe, the outer wall of the central throat pipe protection device is attached to the inner wall of the central throat pipe. The central throat pipe can be protected through the central throat pipe protection device, and the central throat pipe protection device can be replaced after being abraded, so that the service life of the central throat pipe is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnaces, and in particular to a central throat protection device. Background Art

[0002] The central throat is set at the center of the gearbox on the top of the blast furnace. Its main function is to prevent the ironmaking raw materials from directly contacting the inner shell of the gearbox, wearing through the gearbox, causing leakage and damage to the internal gear structure. The central throat is the only passage for the ironmaking raw materials from the material tank to the furnace. It has been subjected to the impact wear of the ironmaking raw materials and the erosion of the high temperature of the furnace top for a long time, and the wear is relatively large.

[0003] At present, the service life of the center throat is generally increased by surfacing hard alloy or spraying wear-resistant alloy inside the center throat. In actual use, the center throat will inevitably be damaged by the erosion of raw materials, and the center throat needs to be replaced. Although this method can increase the service life of the center throat, once the center throat is severely worn, it needs to be replaced. Therefore, it is urgent to set up a center throat protection device to protect the center throat. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the related technology, the present application provides a central throat protection device to solve the above-mentioned technical problems.

[0005] The present application provides a central throat protection device, comprising:

[0006] a first protection segment and a second protection segment;

[0007] The first protection segment is a cone with a hollow structure, and one end with a smaller diameter among the two ends of the first protection segment is connected to the second protection segment;

[0008] The second protection section is a hollow cylinder, the length of the second protection section is less than the length of the central throat pipe, and the outer diameter of the second protection section is consistent with the inner diameter of the central throat pipe;

[0009] When the central throat pipe protection device is placed in the central throat pipe, the outer wall of the central throat pipe protection device fits with the inner wall of the central throat pipe.

[0010] In one embodiment of the present application, the central throat protection device includes a protection member body and a protection layer disposed on the inner wall of the protection member body.

[0011] In one embodiment of the present application, the protective layer is a high chromium wear-resistant layer.

[0012] In one embodiment of the present application, the thickness of the protective layer is 6 mm.

[0013] In one embodiment of the present application, the material of the protection member body is steel.

[0014] In one embodiment of the present application, the thickness of the protective member body is 16 mm.

[0015] In one embodiment of the present application, three lifting ears are evenly arranged on the inner wall of the first protection section.

[0016] As described above, the central throat protection device provided by the present application has the following beneficial effects:

[0017] A central throat protection device in the present application includes a first protection section and a second protection section. The first protection section is a cone with a hollow structure. The end with a smaller diameter at both ends of the first protection section is connected to the second protection section. The second protection section is a hollow cylinder. The length of the second protection section is less than the length of the central throat. The outer diameter of the second protection section is consistent with the inner diameter of the central throat. When the central throat protection device is placed in the central throat, the outer wall of the central throat protection device fits the inner wall of the central throat. The central throat protection device can be used to protect the central throat, and the central throat protection device can be replaced after being worn to extend the service life of the central throat.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a central throat pipe shown in an exemplary embodiment of the present application;

[0021] Figure 2 It is a schematic structural diagram of a central throat protection device shown as an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0024] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0025] At present, the service life of the center throat is generally increased by surfacing hard alloy or spraying wear-resistant alloy inside the center throat. In actual use, the center throat will inevitably be damaged by the scouring of raw materials, and the center throat needs to be replaced. There are two ways to replace the center throat of this structure: one is to remove the lower valve box above the center throat and lift out the center throat, but removing the lower valve box is laborious and requires related hydraulic pipes, lubrication pipes and air pipes to be removed, and reinstallation is also difficult, which will reduce the performance of related devices. Therefore, it requires a considerable amount of work, consumes a lot of manpower, takes a long time, and has many safety hazards. The second is to use the lifting point of the lower valve box door to lower the center throat into the furnace, and then lift it out through the road door. The above two replacement methods are difficult to replace, have a high risk factor, and need to be replaced with the airtight box or the road door and chute. Therefore, it is necessary to set a center throat protection device to protect the center throat and facilitate replacement.

[0026] See also Figure 1 , which is a schematic diagram of the structure of a central throat pipe shown in an exemplary embodiment of the present application. The central throat pipe may include a hollow cylinder located at the bottom and a hollow cone connected to the upper end of the hollow cylinder. The edge of the cone may also be provided with a protruding structure so that the central throat pipe is hung in the center of the blast furnace top gear box.

[0027] See also Figure 2 , Figure 2 is a schematic diagram of the structure of a central throat protection device shown in an exemplary embodiment of the present application. Figure 2 It can be seen that the central throat protection device may include:

[0028] The first protection segment 110 and the second protection segment 120 .

[0029] The first protection segment 110 is a cone with a hollow structure, and one end with a smaller diameter among the two ends of the first protection segment 110 is connected to the second protection segment 120 .

[0030] The second protection section 120 is a hollow cylinder. The length of the second protection section 120 is less than the length of the central throat pipe. The outer diameter of the second protection section 120 is consistent with the inner diameter of the central throat pipe. The central throat pipe can be Figure 1 Center throat shown.

[0031] When the central throat pipe protection device is placed in the central throat pipe, the outer wall of the central throat pipe protection device fits with the inner wall of the central throat pipe.

[0032] In a possible implementation, the central throat protection device includes a protection member body 130 and a protection layer 140 disposed on the inner wall of the protection member body 130. The protection layer 140 may be welded to the inner wall of the protection member body 130.

[0033] In a possible implementation, the protective layer is a high-chromium wear-resistant layer. The protective layer can be welded to the protective member body by full-crack welding.

[0034] In a possible implementation, the thickness of the protective layer is 6 mm.

[0035] In a possible implementation, the material of the protective member body is steel.

[0036] In a possible implementation, the thickness of the protective element body is 16 mm.

[0037] In a possible implementation, the inner wall of the first protection section is evenly provided with three lifting ears ( Figure 2 (not shown). The provision of a lifting lug can assist operators in replacing the central throat protection device.

[0038] Exemplarily, the protection of the central throat can be carried out in the following steps:

[0039] (1) Regularly inspect the top material chute valve guard plate and the valve plate seal of the lower valve box of each blast furnace.

[0040] 1. Wear of the chute valve guard plate: Check the wear of the chute valve guard plates on the top of each blast furnace. Wear of the guard plates, especially the chute valve mouth guard plates, may cause changes in the material flow flushing point during the unloading process, directly flushing the wear-resistant layer of the center throat pipe. The chute guard plates should be replaced during scheduled maintenance.

[0041] 2. Check the sealing condition of the valve plate of the lower valve box: ensure the integrity of the sealing ring of the lower valve box. After the sealing ring leaks, an air flow channel is formed between the furnace cylinder and the discharge tank, resulting in abnormal temperature rise of the central throat pipe, etc. The central throat pipe may burst due to abnormal temperature.

[0042] 3. Temperature control of the lower valve box: Ensure that the temperature of the lower valve box is within the controllable range. On the basis of fully balancing the energy cost, use nitrogen to cool the lower valve box and the center throat.

[0043] (2) Improve and optimize the central throat.

[0044] 1. The central throat pipe is used as the discharge channel between the blast furnace hearth and the discharge tank. The wear of each blast furnace is affected by the airflow in the furnace, the wear degree of the material flow valve, etc. The flushing points of the central throat pipe during the discharge process are inconsistent. The inspection party can regularly adjust the central throat pipe according to the flushing points of the central throat pipe. When the flushing points remain unchanged, adjust its angle according to the wear of the central throat pipe, that is, adjust it 90 degrees. This adjustment can ensure that the service life of the central throat pipe is extended by 4 times (90 degrees each time).

[0045] 2. By arranging the central throat pipe protection device provided in the embodiment of the present application above the central throat pipe, the scouring of the central throat pipe during the raw material feeding process can be effectively reduced. The central throat pipe protection device is simple to process and easy to replace. It can be replaced through the inspection door of the lower valve box. After the material chute valve is opened, the raw materials entering the furnace pass through the cone ring and then enter the furnace cylinder through the central throat pipe, thereby avoiding the central throat pipe from being scoured by the raw materials and extending its service life.

[0046] (3) Strengthen the temperature control of the airtight box and the lower valve box.

[0047] 1. Monitor the temperature of the airtight box and the lower valve box, and ensure that the cooling water circulation system of the airtight box is unobstructed and there is no pipe blockage through maintenance. In the high temperature season in summer, strengthen the water temperature and flow control of the cooling water system to ensure that the temperature of the airtight box is within the controllable range.

[0048] 2. The temperature control of the lower valve box is mainly carried out by nitrogen. Because the temperature of the lower valve box may rise due to the influence of the top temperature of the blast furnace, the operator needs to adjust the nitrogen volume in time according to the requirements to ensure that the temperature of the lower valve box is within the controllable range.

[0049] By ensuring that the temperature of the furnace top unloading equipment is controllable through the above methods, the service life of the center throat can be effectively improved, and problems such as the center throat bursting due to excessive temperature can be prevented.

[0050] In summary, the embodiment of the present application provides a central throat protection device, which includes a first protection section and a second protection section. The first protection section is a cone with a hollow structure. The end with a smaller diameter at both ends of the first protection section is connected to the second protection section. The second protection section is a hollow cylinder. The length of the second protection section is less than the length of the central throat. The outer diameter of the second protection section is consistent with the inner diameter of the central throat. When the central throat protection device is placed in the central throat, the outer wall of the central throat protection device fits the inner wall of the central throat. The central throat protection device can be used to protect the central throat, and the central throat protection device can be replaced after being worn to extend the service life of the central throat.

[0051] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Including" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to".

[0052] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A central throat protection device, characterized in that: include: a first protection segment and a second protection segment; The first protection segment is a cone with a hollow structure, and one end with a smaller diameter among the two ends of the first protection segment is connected to the second protection segment; The second protection section is a hollow cylinder, the length of the second protection section is less than the length of the central throat pipe, and the outer diameter of the second protection section is consistent with the inner diameter of the central throat pipe; When the central throat pipe protection device is placed in the central throat pipe, the outer wall of the central throat pipe protection device fits with the inner wall of the central throat pipe.

2. The central throat protection device according to claim 1, characterized in that: The central throat protection device comprises a protection member body and a protection layer arranged on the inner wall of the protection member body.

3. The central throat protection device according to claim 2, characterized in that: The protective layer is a high-chromium wear-resistant layer.

4. The central throat protection device according to claim 3, characterized in that: The thickness of the protective layer is 6 mm.

5. The central throat protection device according to claim 2, characterized in that: The material of the protective member body is steel.

6. The central throat protection device according to claim 5, characterized in that: The thickness of the protective member body is 16 mm.

7. The central throat protection device according to claim 1, characterized in that: The inner wall of the first protection section is evenly provided with three lifting ears.

Images