CN116179775A

CN116179775A - Method for repairing root of gooseneck for blast furnace

Info

Publication number: CN116179775A
Application number: CN202211575485.8A
Authority: CN
Inventors: 刘继朝; 郑旭; 郑强; 苗龙; 张式宝; 王振东; 徐挺; 王渐灵; 高超; 吴优
Original assignee: Ansteel Group Chaoyang Steel Co ltd
Current assignee: Ansteel Group Chaoyang Steel Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-05-30

Abstract

The invention provides a method for repairing the root of a gooseneck for a blast furnace, which comprises the following steps: after the blast furnace is in damping down, the communication between the gas pipeline, the hot blast furnace pipeline and the waste gas pipeline of the hot blast furnace and the hot blast furnace is cut off; removing a short pipe of the gooseneck, and removing the original refractory material at the root of the gooseneck; manufacturing a mold, wherein the mold is divided into a mold flange and a mold steel pipe; the die is installed, the die flange is fixedly connected with the flange of the gooseneck, and the die steel pipe penetrates into the gooseneck and is in close contact with the hot air surrounding pipe refractory material; pouring, namely pouring into the gooseneck through the pouring holes to form a pouring body; baking and curing the pouring body after pouring is completed; and (5) removing the die, and putting the die into use after the die is qualified by inspection. According to the invention, the gooseneck is repaired by manufacturing the simple mould, the repair cost is low, the repair time is shorter, the repair is convenient, the root of the gooseneck is not required to be removed, the pouring is performed again on the basis of the original gooseneck, and the operation is convenient.

Description

Method for repairing root of gooseneck for blast furnace

Technical Field

The invention relates to the technical field of gooseneck repair, in particular to a method for repairing the root of a gooseneck for a blast furnace.

Background

The high blast temperature is one of the most important technologies of the production progress of the modern large blast furnace, the heat brought by the hot blast accounts for more than 30% of the total heat demand of the blast furnace, and the hot air provided by the hot blast furnace is distributed to the blast furnace through a hot air surrounding pipe of the blast furnace, and a certain number of gooseneck pipes, air supply straight pipes and air inlets connected with the surrounding pipe are distributed to the blast furnace, so that the normal smelting of the blast furnace is ensured.

The gooseneck is composed of two parts, one part is a detachable short pipe, the other part is a root part directly connected with the surrounding pipe skin, the root part cannot be replaced during normal maintenance, because the external armor of the root part is welded with the hot-blast surrounding pipe armor, and the lining is built together with the surrounding pipe when the newly-built blast furnace is built. When high-temperature and high-pressure hot air enters the bustle pipe and passes through the root of the gooseneck, the hot air is suddenly redirected, has large scouring effect, is poor in quality of the refractory material or is subjected to long-term scouring, so that the crack and the falling of the refractory material in the bustle pipe are extremely easy to cause the temperature of an external armor to exceed the standard, even burn through, and the safe and stable production of the blast furnace is seriously influenced. Therefore, the root of the gooseneck is one of the weakest links of the blast furnace air supply system, and the temperature abnormality of the root of the traditional gooseneck adopts wind cooling or water cooling, but the root problem is not solved, and after the refractory material is dropped, the gooseneck must be repaired.

Disclosure of Invention

The invention provides a method for repairing the root of a gooseneck for a blast furnace, which is used for solving the problems that the crack or the falling of a brick lining at the root of the gooseneck for the blast furnace causes abnormal temperature of an external steel and even burning-through, and seriously affects the safe and stable operation of the blast furnace.

The invention adopts the following technical means:

a method for repairing the root of a gooseneck for a blast furnace comprises the following steps:

(1) After the blast furnace is in damping down, the communication between the gas pipeline, the hot blast furnace pipeline and the waste gas pipeline of the hot blast furnace and the hot blast furnace is completely cut off;

(2) Removing a short pipe of the gooseneck, removing the original refractory material at the root of the gooseneck, and roughening the surface of the refractory material connected with the gooseneck and the bustle into a saw-tooth shape;

(3) Manufacturing a die, wherein the die is divided into two parts, one part is a die flange matched with the flange of the gooseneck, the die flange is manufactured by using a 10mm thick steel plate, the lower part of the die flange is provided with a pouring hole, the other part is a die steel pipe with the same inner diameter as the root of the gooseneck, after the two parts are manufactured, the die flange and the die steel pipe are assembled (an assembling seam is less than or equal to 5 mm), the die steel pipe is fixed with the center of the die flange by adopting a welding method, and the die steel pipe is required to be long enough to be in tight contact with the hot air surrounding pipe resistant material.

(4) The die is installed, the working face is wetted by a bonding agent before the die is installed, the die flange is fixedly connected with the flange of the gooseneck through bolts, the die steel pipe penetrates into the gooseneck and is in tight contact with the refractory material of the bustle pipe, and the injection pressing short pipe and the ball valve are installed at the pouring hole after the die is fixed.

(5) Pouring, namely pouring the pouring holes into the gooseneck to form a pouring body, wherein the pouring material is pouring materials combined with high-strength heat-insulating wear-resisting sol.

(6) Baking and curing the pouring body after pouring, and baking the pouring body by using combustion mediums such as coal gas, wherein the baking temperature is 700-1200 ℃ and the baking time is 10-15 hours.

(7) And (3) removing the die, putting the gooseneck into use after the gooseneck is inspected to be qualified, and carrying out the steps (2), (4), (5) and (6) again after the gooseneck is unqualified until the gooseneck is qualified.

Compared with the prior art, the invention has the following advantages:

according to the invention, the gooseneck is repaired by manufacturing the simple mould, the repair cost is low, the repair time is shorter, the repair is convenient, the root of the gooseneck is not required to be removed, the pouring is performed again on the basis of the original gooseneck, and the operation is convenient. The temperature of the root of the gooseneck repaired by the method is recovered to be normal, and forced cooling is not needed.

Based on the reasons, the invention can be widely popularized in the fields of gooseneck repair and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the mold connection in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a flange structure in an embodiment of the present invention.

Fig. 3 is a schematic view of a structure of a mold steel pipe in an embodiment of the present invention.

In the figure: 1. a gooseneck; 2. a hot air surrounding pipe; 3. a flange; 4. a die flange; 5. a die steel tube; 6. pressing and injecting a short pipe and a ball valve; 7. and (5) pouring the body.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

As shown in fig. 1 to 3, a method for repairing a root of a gooseneck for a blast furnace comprises the following steps:

(2) Removing a short pipe of the gooseneck 1, removing the original refractory material at the root of the gooseneck 1, and roughening the surface of the refractory material connected with the gooseneck 1 and the bustle 2 into a saw-tooth shape;

(3) Manufacturing a die, wherein the die is divided into two parts, one part is a die flange 4 matched with a flange 3 of the gooseneck 1, the die flange 4 is manufactured by using a 10mm thick steel plate, a pouring hole is formed in the lower part of the die flange 4, the other part is a die steel pipe 5 with the same inner diameter as the root of the gooseneck 1, after the two parts are manufactured, the die flange 4 and the die steel pipe 5 are assembled (an assembling seam is less than or equal to 5 mm), the die steel pipe 5 is fixed with the center of the die flange 4 by adopting a welding method, and the die steel pipe 5 is required to be long enough to be in tight contact with the refractory material of the hot air surrounding pipe 2.

(4) The die is installed, the working face is wetted by a bonding agent before the die is installed, the die flange 4 is fixedly connected with the flange 3 of the gooseneck 1 through bolts, the die steel pipe 5 penetrates into the gooseneck 1 and is in tight contact with the refractory material of the bustle pipe 2, and after the die is fixed, the injection pressing short pipe and the ball valve 6 are installed at the pouring hole.

(5) Pouring, namely pouring the pouring body 7 into the gooseneck 1 through the pressure pouring short pipe and the ball valve 6, wherein the pouring material for pouring is a pouring material combined with high-strength heat-insulating wear-resisting sol, and the pouring material can be a pouring material combined with corundum mullite by adopting silica sol.

(6) And after pouring, baking and curing the pouring body 7, and baking the pouring body 7 by using combustion mediums such as gas, wherein the baking temperature is 700-1200 ℃ and the baking time is 10-15 hours.

(7) And (3) removing the die, putting the die into use after the die is qualified, and repeating the steps (2), (4), (5) and (6) after the die is unqualified until the die is qualified.

The temperature of the root of the gooseneck 1 repaired by the method is recovered to be normal, and forced cooling is not needed. After a period of production, the repair part is inspected, the refractory is found to be perfect, the quality is reliable, the energy waste is eliminated, and the safe production is ensured.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The method for repairing the root of the gooseneck for the blast furnace is characterized by comprising the following steps of:

(1) After the blast furnace is in damping down, the communication between the gas pipeline, the hot blast furnace pipeline and the waste gas pipeline of the hot blast furnace and the hot blast furnace is cut off;

(2) Removing a short pipe of the gooseneck, and removing the original refractory material at the root of the gooseneck;

(3) Manufacturing a mould, wherein the mould is divided into two parts, one part is a mould flange matched with the flange of the gooseneck, the lower part of the mould flange is provided with a pouring hole, the other part is a mould steel pipe with the same inner diameter as the root of the gooseneck, and the mould steel pipe is fixed with the center of the flange;

(4) The die is installed, the die flange is fixedly connected with the flange of the gooseneck, and the die steel pipe penetrates into the gooseneck and is in close contact with the hot air surrounding pipe refractory material;

(5) Pouring, namely pouring into the gooseneck through the pouring holes to form a pouring body;

(6) Baking and curing the pouring body after pouring is completed;

2. The method for repairing a root of a gooseneck for a blast furnace according to claim 1, wherein in the step (2), the surface of the refractory to which the gooseneck and the bustle pipe are connected is roughened in a zigzag shape.

3. The method for repairing the root of the gooseneck for the blast furnace according to claim 1, wherein the pouring hole is provided with a pressing pouring short pipe and a ball valve.

4. The method for repairing the root of a gooseneck for a blast furnace according to claim 1, wherein in the step (6), the casting body is baked by using gas as a combustion medium, and the baking temperature is 700-1200 ℃ and the baking time is 10-15 hours.