Sealing structure of blast furnace body air inlet system

Abstract

The utility model discloses a sealing structure of an air inlet system of a blast furnace body, which belongs to the field of blast furnace gas treatment and comprises a tuyere large sleeve connected on a furnace shell flange through a large sleeve flange, a tuyere medium sleeve embedded on the tuyere large sleeve and a tuyere small sleeve embedded on the tuyere medium sleeve. High-aluminum anhydrous press-in grouting material is injected into the iron sheet shroud ring; two circular seams are arranged at the outermost edge of the joint of the small tuyere sleeve and the middle tuyere sleeve, and sealing rings are arranged in the circular seams; a first sealant layer is smeared at a gap where the tuyere small sleeve is connected with the tuyere medium sleeve; and a second sealant layer is smeared at a gap where the tuyere middle sleeve is connected with the tuyere large sleeve. According to the utility model, the original gas leakage value of more than 2000ppm under the normal production condition can be directly reduced to 0-50ppm, so that the potential safety hazard of the working site is greatly eliminated, and the safety coefficient of the site environment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace gas treatment, in particular to a sealing structure of a blast furnace body air intake system. Background Art

[0002] In accordance with the national safety inspection requirements for special gas treatment, steel mills must conduct a comprehensive inspection of blast furnaces, gas pipelines and ancillary equipment, and clear out safety hazards such as gas leakage at the roots of blast furnace cooling wall water pipes, air intake systems, gas pipelines, metal compensators, etc. due to stress deformation and rust at welds caused by long-term use.

[0003] Due to the long-term high-temperature thermal stress and structural stress changes, the tuyere sleeves of the blast furnace body will slowly deform, which in turn affects the deformation of the conical surface of the rigid seal. In the normal production process, the outer end face of the middle sleeve of the blast furnace tuyere often undergoes a small displacement deformation from the lower side to the furnace, and a small displacement deformation from the upper side to the outside of the furnace. This causes problems such as weld cracking and loose sealing between sleeves. Gas leakage to varying degrees will occur in the gap between the large sleeve and the middle sleeve of the blast furnace tuyere, and the gap between the middle sleeve and the small sleeve. In serious places, the gas value will explode, causing major safety hazards of gas leakage. Daily repair welding, grouting and other processes cannot completely solve the leakage problem. Conventional welding repair processes have poor gas control effects and cannot eliminate hidden dangers. Therefore, there is an urgent need for a sealing structure for the blast furnace body air inlet system that can effectively solve the gas leakage problem of the blast furnace tuyere in steel plants. Utility Model Content

[0004] In view of the problems of many gas leakage points, high concentration, erratic and strong harmfulness in the tuyere area, the utility model provides a sealing structure for the air inlet system of the blast furnace body, which can directly reduce the original gas leakage value of more than 2000ppm (off the scale) under normal production conditions to 0-50ppm, greatly eliminating the safety hazards at the work site and improving the safety factor of the on-site environment.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A sealing structure for a blast furnace body air inlet system comprises a large tuyere sleeve connected to a furnace shell flange of a blast furnace shell by a large sleeve flange, a middle tuyere sleeve embedded in the large tuyere sleeve and a small tuyere sleeve embedded in the middle tuyere sleeve, iron sheet hoops are welded outside the large sleeve flange and the furnace shell flange, and high-aluminum anhydrous pressure injection grouting material is injected into the iron sheet hoops; two annular seams are arranged at the outermost edge of the connection between the small tuyere sleeve and the middle tuyere sleeve, and sealing rings are arranged in the annular seams; a first sealing glue layer is applied to the gap connecting the small tuyere sleeve and the middle tuyere sleeve; a second sealing glue layer is applied to the gap connecting the middle tuyere sleeve and the large tuyere sleeve.

[0007] A further improvement of the technical solution of the utility model is that the depth of the annular seam is 5 mm and the width is 5 mm.

[0008] A further improvement of the technical solution of the utility model is that the sealing ring is a compressed and compacted graphite packing.

[0009] A further improvement of the technical solution of the utility model is that the first sealant layer and the second sealant layer are both high-density ion structure glue.

[0010] A further improvement of the technical solution of the utility model is that before applying the first sealant layer and the second sealant layer, the outer edges of the small air vent sleeve and the middle air vent sleeve are polished cleanly with a polishing machine, and moisture and dust are blown away.

[0011] A further improvement of the technical solution of the utility model is that the annular seam is machined by a lathe.

[0012] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0013] 1. The utility model has iron sheet hoops welded outside the large sleeve flange and the furnace shell flange, and high-aluminum waterless pressure injection grouting material is injected into the iron sheet hoops; two annular seams are arranged at the outermost edge of the connection between the small tuyere sleeve and the middle tuyere sleeve, and sealing rings are arranged in the annular seams; a first sealing glue layer is applied to the gap between the small tuyere sleeve and the middle tuyere sleeve; a second sealing glue layer is applied to the gap between the middle tuyere sleeve and the large tuyere sleeve; no changes are made to the equipment process, the quality and performance of the equipment are not affected, and the production process is not affected in any way in daily production, so the sealing effect of 95-99% of the blast furnace air inlet system is well achieved.

[0014] 2. The utility model aims at the characteristics of many gas leakage points, high concentration, erratic and strong harmfulness in the tuyere area of ​​the blast furnace air inlet system, and achieves the remarkable effect of full sealing of the gas in the tuyere area, so that the original gas leakage value of more than 2000ppm (bursting the scale) under normal production conditions is directly reduced to 0-50ppm, which greatly eliminates the safety hazards at the work site and improves the safety factor of the on-site environment.

[0015] 3. The utility model turns the annular seam of the built-in sealing ring at the end of the small tuyere sleeve, applies high-density ion structural adhesive at the connecting gap, and welds the iron sheet hoop outside the flange of the large tuyere sleeve and injects grout. It is simple and easy to operate, with low transformation cost and good effect. It not only improves the working environment of the workers and meets the rigid requirements of safety inspection, but also solves the problem of poor sealing of the blast furnace air inlet system and achieves good social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of the blast furnace air inlet system of the utility model;

[0018] Figure 2 This is a structural schematic diagram of the small sleeve of the wind port in the utility model;

[0019] Among them, 1. Large tuyere sleeve; 2. Medium tuyere sleeve; 3. Small tuyere sleeve; 3-1. First annular gap; 3-2. Second annular gap. DETAILED DESCRIPTION

[0020] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0024] like Figure 1 ,2 As shown, a sealing structure of a blast furnace body air inlet system comprises a large tuyere sleeve 1 connected to a furnace shell flange of a blast furnace shell by a large sleeve flange, a middle tuyere sleeve 2 embedded in the large tuyere sleeve 1 and a small tuyere sleeve 3 embedded in the middle tuyere sleeve 2, iron sheet hoops are welded outside the large sleeve flange and the furnace shell flange, and high-aluminum anhydrous pressure-injection grouting material is injected into the iron sheet hoops; two annular seams are arranged at the outermost edge of the connection between the small tuyere sleeve 3 and the middle tuyere sleeve 2, and sealing rings are arranged in the annular seams; a first sealing glue layer is applied at the gap where the small tuyere sleeve 3 and the middle tuyere sleeve 2 are connected; a second sealing glue layer is applied at the gap where the middle tuyere sleeve 2 and the large tuyere sleeve 1 are connected.

[0025] Furthermore, the annular seam has a depth of 5 mm and a width of 5 mm.

[0026] Furthermore, the sealing ring is a graphite packing that is compacted and rammed.

[0027] Furthermore, the first sealant layer and the second sealant layer are both high-density ion structure adhesives.

[0028] Furthermore, before applying the first sealant layer and the second sealant layer, the outer edges of the small tuyere sleeve 3 and the middle tuyere sleeve 2 are polished clean with a polishing machine, and the moisture and dust are blown away.

[0029] Furthermore, the annular seam is turned by lathe.

[0030] Specific:

[0031] (1) The large sleeve flange of the tuyere large sleeve 1 is also one of the main parts of gas leakage. The large sleeve flange and the furnace shell flange are directly welded with iron sheet hoops, and then high-aluminum anhydrous pressure injection grouting material is injected. The iron sheet hoop can cover the large sleeve flange and the furnace shell flange tightly, which can play an excellent sealing role.

[0032] (2) If Figure 2 As shown, two (5mm high*5mm wide) annular gaps (first annular gap 3-1 and second annular gap 3-2) are turned on the outermost edge of the tuyere small sleeve 3, and the annular gaps are compressed and compacted with graphite packing to form a sealing ring. When the tuyere small sleeve 3 is installed, the tuyere small sleeve 3 and the tuyere middle sleeve 2 are sealed, isolating the gap between the tuyere middle sleeve 2 and the tuyere small sleeve 3, thereby playing a role in sealing the coal gas.

[0033] (3) After the middle air vent sleeve 2 and the small air vent sleeve 3 are installed in place, use a polisher to grind the outer edges of the middle air vent sleeve 2 and the small air vent sleeve 3 clean, blow away the moisture and dust, and use a high-density ion structural glue to glue the gaps between the small air vent sleeve 3, the middle air vent sleeve 2, and the large air vent sleeve 1. Let them dry naturally. If individual leaks occur, re-apply the glue to seal them.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A sealing structure for a blast furnace main body air inlet system, comprising a large tuyere sleeve (1) connected to a furnace shell flange of a blast furnace shell by a large sleeve flange, a middle tuyere sleeve (2) embedded in the large tuyere sleeve (1), and a small tuyere sleeve (3) embedded in the middle tuyere sleeve (2), characterized in that: Iron hoops are welded outside the large sleeve flange and the furnace shell flange, and high-aluminum water-free pressure injection grouting material is injected into the iron hoops; two annular seams are arranged at the outermost edge of the connection between the small tuyere sleeve (3) and the middle tuyere sleeve (2), and sealing rings are arranged in the annular seams; a first sealing glue layer is applied to the gap between the small tuyere sleeve (3) and the middle tuyere sleeve (2); and a second sealing glue layer is applied to the gap between the middle tuyere sleeve (2) and the large tuyere sleeve (1).

2. The sealing structure of the blast furnace main body air intake system according to claim 1, characterized in that: The depth of the annular seam is 5 mm and the width is 5 mm.

3. The sealing structure of the blast furnace main body air inlet system according to claim 1 is characterized in that: The sealing ring is a graphite packing that is compacted and rammed.

4. The sealing structure of the blast furnace main body air inlet system according to claim 1 is characterized in that: The first sealant layer and the second sealant layer are both high-density ion structure glue.

5. The sealing structure of the blast furnace main body air inlet system according to claim 1 is characterized in that: Before applying the first sealant layer and the second sealant layer, the outer edges of the small air vent sleeve (3) and the middle air vent sleeve (2) are polished clean with a grinder, and moisture and dust are blown away.

6. The sealing structure of the blast furnace main body air inlet system according to claim 1, characterized in that: The annular seam is machined by lathe.

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