CN118057108A - Treatment method for high temperature of shell of connecting pipe ripple compensator of external combustion type hot blast stove - Google Patents
Treatment method for high temperature of shell of connecting pipe ripple compensator of external combustion type hot blast stove Download PDFInfo
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- CN118057108A CN118057108A CN202211459680.4A CN202211459680A CN118057108A CN 118057108 A CN118057108 A CN 118057108A CN 202211459680 A CN202211459680 A CN 202211459680A CN 118057108 A CN118057108 A CN 118057108A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 239000010425 asbestos Substances 0.000 claims abstract description 37
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 230000006378 damage Effects 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 229920000742 Cotton Polymers 0.000 claims abstract description 12
- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 208000014674 injury Diseases 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000003672 processing method Methods 0.000 claims abstract description 3
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000011449 brick Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000005465 channeling Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
The invention relates to a processing method for high temperature of an outer shell of a connecting pipe ripple compensator of an external combustion type hot blast stove, which comprises the following steps: the first step: preparing process conditions, stopping air supply and burning of the hot blast stove to be repaired, exhausting the pressure in the stove, and performing the second step: determining a surface cutting position, cutting off a shell steel plate of a high-temperature part of the connecting pipe ripple compensator above the maze, and the third step: checking the injury degree of the inner connecting pipe, and a fourth step: and (3) maze repair, namely: filling common ceramic fiber cotton, and a sixth step: and recovering the outer layer steel plate. According to the scheme, the asbestos rope in the labyrinth can be effectively prevented from being blown out, the surface temperature of the corrugated compensator steel plate is increased, and the burning-through accident of the connecting pipe corrugated compensator shell is avoided.
Description
Technical Field
The invention relates to a treatment method, in particular to a treatment method for high shell temperature of a connecting pipe ripple compensator of an external combustion type hot blast stove, and belongs to the technical field of iron making.
Background
The hot blast stove is an auxiliary equipment for blast furnace iron making, and is used for providing high-temperature hot air for the blast furnace. Common external combustion type hot blast stoves are of the copy type, the floor type, the Martin type and the new japanese type. The connecting pipeline between the combustion chamber of the new japanese iron type hot blast stove and the spherical roof of the regenerator is shown in the circle part of the figure 1. The uneven expansion between the combustion chamber and the regenerator is absorbed by a corrugated compensator (consisting of a corrugated pipe, a shell steel plate, an inner connecting pipe and a labyrinth) arranged on the connecting pipe. In order to prevent the temperature of the corrugated compensator from rising due to the channeling of high-temperature gas, a simple labyrinth is generally arranged in the corrugated compensator, as shown in the circle part of fig. 2, a labyrinth stop plate is arranged below the upper cover plate, and asbestos ropes are generally stuffed in the labyrinth for heat insulation protection. Because of the uneven displacement of the combustion chamber and the regenerator, the connecting pipe and the labyrinth upper cover plate between the combustion chamber and the regenerator can move. A certain gap is reserved between the traditional hot-blast stove stop plate and the upper cover plate, so that the upper cover plate is prevented from moving downwards to squeeze the stop plate, and the surface of the inner connecting pipe is prevented from being damaged. However, when the labyrinth upper cover plate moves upwards or moves rightwards, the gap between the upper cover plate and the stop plate is increased, when the gap is larger than the diameter of the asbestos rope, high-pressure gas in the hot blast stove passes through the expansion gap and the labyrinth, the asbestos rope in the labyrinth can be blown out, so that the corrugated compensator and the hot blast stove pipeline are communicated, and the temperature of the shell steel plate of the corrugated compensator of the connecting pipe is increased. If the temperature is higher than 280 ℃ for a long period of time, the steel plate is fatigued and deformed to burn through.
For the high temperature of the connecting pipe ripple compensator housing steel plate caused by gas channeling, the method adopted at present is mainly to recoating the ripple compensator, namely, recoating a layer of steel pipe outside the connecting pipe ripple compensator housing steel plate after the temperature of the connecting pipe ripple compensator housing steel plate is found to be high. The method has high cost and long construction period, generally needs about one week, covers the problematic compensator inside, has poor heat dissipation of the inner steel plate, is easier to raise the temperature and is difficult to find, and can lead to high temperature of the clad connecting pipe ripple compensator shell steel plate, thereby generating burning-through accidents.
The Chinese patent of the authorized bulletin number CN101008553A discloses a lining structure of an expansion joint of a hot air pipeline of a hot air furnace, which comprises a corrugated pipe, a shell, an inner container, an expansion joint, a refractory spraying material layer, a heat insulation brick layer and a refractory brick layer which are arranged from outside to inside, wherein the corrugated pipe is welded on the shell, the expansion joint is connected with one section of the inner container of the corrugated pipe, the refractory spraying material layer is sprayed between the inner container and the heat insulation brick layer, the refractory brick layer is built on the inner side of Wen Zhuanceng by a working surface, at least one sliding seam is arranged on the refractory brick layer, and the sliding seam is positioned below the corrugated pipe. The method mainly reduces the phenomenon of gas blow-by through the treatment of refractory materials, and can not solve the problem of high temperature of the shell steel plate of the connecting pipe ripple compensator of the hot blast stove caused by gas blow-by. The expansion joint in the content of the patent is the ripple compensator in the patent.
Disclosure of Invention
The invention aims at the problems in the prior art, and provides a treatment method for the high temperature of the shell of the ripple compensator of the connecting pipe of the external combustion type hot blast stove, which mainly solves the technical problem of high surface temperature of the ripple compensator caused by gas channeling in the prior art, and the elastic stop piece cannot damage the surface of the connecting pipe when the upper cover plate of the maze moves downwards because the combustion chamber and the regenerator can shift unevenly; when the labyrinth upper cover plate moves upwards or moves left and right, the diameter of the asbestos rope and the size of the elastic stop piece are selected and reasonably arranged, so that the asbestos rope in the labyrinth can be effectively prevented from being blown out, the surface temperature of the corrugated compensator steel plate is increased, and the burning-through accident of the connecting pipe corrugated compensator shell is avoided.
In order to achieve the above purpose, the technical scheme of the invention is as follows, and the processing method for the high temperature of the shell of the ripple compensator of the connecting pipe of the external combustion type hot blast stove comprises the following steps:
the first step: preparing process conditions, stopping air supply and burning of the hot blast stove to be repaired, and exhausting the pressure in the stove;
And a second step of: determining the surface cutting position, cutting off the shell steel plate at the high temperature part of the connecting pipe ripple compensator above the maze,
And a third step of: checking the injury degree of the inner connecting pipe, checking the injury degree and the injury range of the inner connecting pipe of the ripple compensator, cleaning the cut pipeline, covering an arc-shaped steel plate if the inner connecting pipe is damaged,
Fourth step: the maze is repaired by the method,
Resetting the blown asbestos ropes in the original maze;
4.2 adding new asbestos ropes to fill the maze, and removing the original stop plate;
4.3, an elastic stop piece a is welded downwards on an upper cover plate in the labyrinth and is contacted with the inner contact but not welded;
4.4, welding an elastic stop piece b upwards from the inner connecting pipe at the outer side of the elastic stop piece a;
4.5 the elastic stopper pieces a and b are maintained at a certain distance, and a pair of elastic stopper pieces b and a are installed at a certain distance in the circumferential direction.
4.6 Critical data selection
Assuming that the design of the connecting pipe allows the maximum axial displacement + -x, setting positive rightward and negative leftward; designing the maximum allowable radial displacement + -y, and setting positive upwards and negative downwards; the labyrinth upper cover plate is separated from the inner connecting pipe by Y, the diameter of the asbestos rope is d, the height of the elastic stop piece a in the vertical direction is Y1, and the filled asbestos rope is compressible under external pressure.
The vertical height of the elastic stop piece a is y1=Y, the arc length of the elastic stop piece a is 1/4 multiplied by pi multiplied by 2 multiplied by Y1, and the distance between the tail end of the elastic stop piece b and the elastic stop piece a is smaller than or equal to the diameter d of the asbestos rope.
4.6.1 Asbestos rope diameter d is selected
The following inequality can be obtained from the maximum displacement in the radial direction:
y≤1/4×π×2×y1+d-Y；(1)
When the upper cover plate is displaced upwards, the diameter d of the asbestos rope is more than or equal to Y-0.57Y, so that the asbestos rope can be prevented from being blown out of the labyrinth.
When the upper cover plate is displaced downwards, the damage of the inner connecting pipe can not be caused in the deformation range of the elastic stop piece a and the elastic stop piece b.
In order to ensure the packing compactness and convenient packing of the maze, the diameter d of the asbestos rope is in the range of Y-0.57Y which is not less than d and not more than 1/2Y.
4.6.2 The length k in the horizontal direction of the elastic stop tab b is selected
The following inequality can be obtained from the maximum displacement axially to the left:
∣-x∣≤d+k；(3)
If the axial direction is displaced to the right, the elastic stop piece a can stop,
4.6.3 The distance m between the end of the elastic stop piece b and the inner connecting pipe is selected,
The distance m between the tail end of the elastic stop piece b and the inner connecting pipe is less than or equal to d,
Fifth step: and filling common ceramic fiber cotton, and filling the common ceramic fiber cotton between the inner connecting pipe and the outer shell.
Sixth step: and recovering the outer layer steel plate, welding the outer layer steel plate with the original steel plate, properly reinforcing the welded joint part, and cleaning the surface and detecting leakage.
Compared with the prior art, the invention has the advantages that the invention can prevent the asbestos rope from being blown out, fundamentally solves the problem of high surface temperature of the connecting pipe ripple compensator caused by gas blow-by, and experiments are carried out on the connecting pipe of the 4070m 3、3200m3 blast furnace hot blast stove of Bao-steel company; the method has the advantages of short treatment time and low cost, and the treatment time is only 15 hours; the method is also suitable for manufacturing a new connecting pipe ripple compensator by processing the labyrinth in the connecting pipe ripple compensator.
Drawings
FIG. 1 is a schematic diagram of a new day iron external combustion type hot blast stove;
FIG. 2 is a schematic diagram of a conventional hot blast stove dome tie pipe ripple compensator;
FIG. 3 is a schematic diagram of an improved blast furnace dome tie pipe ripple compensator;
FIG. 4 is a schematic diagram of a portion of a maze in detail.
In the figure: 1-shell, 2-inner connecting pipe, 3-maze, 4-expansion joint, 5-spray coating, 6-zirconium-containing ceramic fiber cotton, 7-refractory brick, 8-common ceramic fiber cotton, 9-elastic stop piece a, 10-elastic stop piece b, 11-asbestos rope, 12-stop plate and 13-upper cover plate.
Detailed Description
In order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.
Example 1: referring to fig. 1-4, a method for treating high temperature of an outer shell of a connecting pipe ripple compensator of an external combustion type hot blast stove comprises the following steps:
the first step: preparing process conditions, stopping air supply and burning of the hot blast stove to be repaired, and exhausting the pressure in the stove;
And a second step of: determining the surface cutting position, cutting off the shell steel plate at the high temperature part of the connecting pipe ripple compensator above the maze,
And a third step of: checking the injury degree of the inner connecting pipe, checking the injury degree and the injury range of the inner connecting pipe of the ripple compensator, cleaning the cut pipeline, covering an arc-shaped steel plate if the inner connecting pipe is damaged,
Fourth step: maze repair, see FIGS. 3 and 4
Resetting the blown asbestos ropes in the original maze;
4.2 adding new asbestos ropes to fill the maze, and removing the original stop plate;
4.3, an elastic stop piece a is welded downwards on an upper cover plate in the labyrinth and is contacted with the inner contact but not welded;
4.4, welding an elastic stop piece b upwards from the inner connecting pipe at the outer side of the elastic stop piece a;
4.5 the elastic stopper pieces a and b are maintained at a certain distance, and a pair of elastic stopper pieces b and a are installed at a certain distance in the circumferential direction.
4.6 Critical data selection
Assuming that the design of the connecting pipe allows the maximum axial displacement + -x, setting positive rightward and negative leftward; designing the maximum allowable radial displacement + -y, and setting positive upwards and negative downwards; the labyrinth upper cover plate is separated from the inner connecting pipe by Y, the diameter of the asbestos rope is d, the height of the elastic stop piece a in the vertical direction is Y1, and the filled asbestos rope is compressible under external pressure.
The vertical height of the elastic stop piece a is y1=Y, the arc length of the elastic stop piece a is 1/4 multiplied by pi multiplied by 2 multiplied by Y1, and the distance between the tail end of the elastic stop piece b and the elastic stop piece a is smaller than or equal to the diameter d of the asbestos rope.
4.6.1 Asbestos rope diameter d is selected
The following inequality can be obtained from the maximum displacement in the radial direction:
y≤1/4×π×2×y1+d-Y；(1)
When the upper cover plate is displaced upwards, the diameter d of the asbestos rope is more than or equal to Y-0.57Y, so that the asbestos rope can be prevented from being blown out of the labyrinth.
When the upper cover plate is displaced downwards, the damage of the inner connecting pipe can not be caused in the deformation range of the elastic stop piece a and the elastic stop piece b.
In order to ensure the packing compactness and convenient packing of the maze, the diameter d of the asbestos rope is in the range of Y-0.57Y which is not less than d and not more than 1/2Y.
4.6.2 The length k in the horizontal direction of the elastic stop tab b is selected
The following inequality can be obtained from the maximum displacement axially to the left:
∣-x∣≤d+k；(3)
If the axial direction is displaced to the right, the elastic stop piece a can stop,
4.6.3 The distance m between the end of the elastic stop piece b and the inner connecting pipe is selected,
The distance m between the tail end of the elastic stop piece b and the inner connecting pipe is less than or equal to d,
Fifth step: and filling common ceramic fiber cotton, and filling the common ceramic fiber cotton between the inner connecting pipe and the outer shell.
Sixth step: and recovering the outer layer steel plate, welding the outer layer steel plate with the original steel plate, properly reinforcing the welded joint part, and cleaning the surface and detecting leakage.
Example 2: referring to fig. 1-4, the following steps of the method are combined with examples Mei Gang, 4070m 3 to repair the high temperature of the connecting pipe of the blast furnace hot blast stove:
The first step: preparation of process conditions
The blast furnace is utilized to repair the machine, the hot blast furnace is stopped to burn, and the furnace is under slight negative pressure.
And a second step of: determining surface cutting position
Cutting off a steel plate of a high-temperature part shell of the connecting pipe ripple compensator above the maze, wherein the cutting radian of the upper part of the compensator shell 1 is 30 degrees, and the arc length is about 1000mm. The skylight with the width of 300mm can be properly enlarged according to practical situations.
And a third step of: checking the extent of injury of the inner connecting tube 2
Checking the damage degree, namely the range, of the inner connecting pipe 2 of the compensator, cleaning the cut area range, and covering a temperature-resistant material arc-shaped plate with the area larger than the 321 grade of the original size on the damaged part, wherein the inner connecting pipe is only cleaned if the inner connecting pipe is not damaged.
Fourth step: maze repair
Resetting the asbestos ropes 11 in the blown original maze 3;
Filling the maze 3 with new asbestos ropes 11 with a diameter of 15mm, and removing the old stop plates 12;
The height of the maze is 50mm, the upper cover plate 13 is welded with an elastic stop piece a 9 downwards, the structure is as shown in figure 4, the width is 25mm, the height is 50mm, the thickness is 2mm, the maze has certain elasticity, the maze is made of stainless steel 316L, and the lower part is contacted with the inner connecting pipe 2 but is not welded;
And an elastic stop piece b 10 is welded on the outer side of the elastic stop piece a 9 upwards from the inner connecting pipe, and the distance d between the tail end of the elastic stop piece b 10 and the elastic stop piece a 9 is 15mm. The width of the elastic stop piece b 10 is 25mm, the height is 50mm, the thickness is 2mm, and the elastic stop piece b is made of stainless steel 316L;
a pair of elastic stop pieces b 10 and a 9 are installed every 100mm in the circumferential direction, and in ideal cases, the elastic stop pieces b 10 and a 9 should stop all round, and a certain interval is needed between each pair in consideration of the elasticity of the stop pieces. Production practice proves that each pair of the separation distances are about 100 mm.
Fifth step: filling common ceramic fiber cotton 8
A window opening part and four Zhou Tianshi common ceramic vicat 8 are arranged between the inner connecting pipe 2 and the shell 1.
Sixth step: recovery of outer layer steel sheet
And recovering the outer layer steel plate, properly reinforcing the welded seam part, and performing surface cleaning and leak detection.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (5)
1. The processing method for the high temperature of the shell of the ripple compensator of the connecting pipe of the external combustion type hot blast stove is characterized by comprising the following steps:
the first step: preparing process conditions, stopping air supply and burning of the hot blast stove to be repaired, exhausting the pressure in the stove,
And a second step of: determining the surface cutting position, cutting off the shell steel plate at the high temperature part of the connecting pipe ripple compensator above the maze,
And a third step of: the extent of the injury of the inner connecting tube is checked,
Fourth step: the maze is repaired by the method,
Fifth step: filling the common ceramic fiber cotton into the ceramic fiber cotton,
Sixth step: and recovering the outer layer steel plate.
2. The method for treating high temperature of outer shell of corrugated compensator of connecting pipe of external combustion type hot blast stove according to claim 1, comprising the third step of: and (3) checking the injury degree of the inner connecting pipe, checking the injury degree and the injury range of the inner connecting pipe of the corrugated compensator, cleaning the cut pipeline, and covering an arc-shaped steel plate if the inner connecting pipe is damaged.
3. The method for processing high temperature of outer shell of corrugated compensator of connecting pipe of external combustion type hot blast stove according to claim 2, characterized by the fourth step: the maze is repaired by the method,
Resetting the blown asbestos ropes in the original maze;
4.2 adding new asbestos ropes to fill the maze, and removing the original stop plate;
4.3, an elastic stop piece a is welded downwards on an upper cover plate in the labyrinth and is contacted with the inner contact but not welded;
4.4, welding an elastic stop piece b upwards from the inner connecting pipe at the outer side of the elastic stop piece a;
4.5 the elastic stop piece a and the elastic stop piece b keep a certain distance, and a pair of elastic stop pieces b and elastic stop pieces a are arranged at intervals along the circumferential direction;
4.6, selecting key data,
Assuming that the design of the connecting pipe allows the maximum axial displacement + -x, setting positive rightward and negative leftward; designing the maximum allowable radial displacement + -y, and setting positive upwards and negative downwards; the distance between the labyrinth upper cover plate and the inner connecting pipe is Y, the diameter of the asbestos rope is d, the height of the elastic stop piece a in the vertical direction is Y1, the filled asbestos rope is compressible under external pressure,
The vertical height of the elastic stop piece a is y1=Y, the arc length of the elastic stop piece a is 1/4 multiplied by pi multiplied by 2 multiplied by Y1, the distance between the tail end of the elastic stop piece b and the elastic stop piece a is less than or equal to the diameter d of the asbestos rope,
4.6.1 Asbestos rope diameter d is chosen,
The following inequality can be obtained from the maximum displacement in the radial direction:
y≤1/4×π×2×y1+d-Y； (1)
when the upper cover plate is displaced upwards, the diameter d of the asbestos rope is more than or equal to Y-0.57Y, so that the asbestos rope can be prevented from being blown out of the maze,
When the upper cover plate is displaced downwards, the damage of the inner connecting pipe can not be caused in the deformation range of the elastic stop piece a and the elastic stop piece b,
In order to ensure the packing compactness and convenient packing of the maze, the diameter d of the asbestos rope is in the range of Y-0.57Y which is not less than d and not more than 1/2Y,
4.6.2 The length k of the elastic stop tab b in the horizontal direction is chosen,
The following inequality can be obtained from the maximum displacement axially to the left:
∣-x∣≤d+k； (3)，
If the axial direction is displaced to the right, the elastic stop piece a can stop,
4.6.3 The distance m between the end of the elastic stop piece b and the inner connecting pipe is selected,
The distance m between the tail end of the elastic stop piece b and the inner connecting pipe is less than or equal to d.
4. A method of treating a high temperature external combustion stove connecting tube corrugated compensator housing according to claim 3, characterized by the fifth step: and filling common ceramic fiber cotton, and filling the common ceramic fiber cotton between the inner connecting pipe and the outer shell.
5. The method for treating high temperature of outer shell of corrugated compensator for connecting pipe of external combustion type hot blast stove according to claim 3 or 4, characterized by the sixth step: and recovering the outer layer steel plate, welding the outer layer steel plate with the original steel plate, properly reinforcing the welded joint part, and cleaning the surface and detecting leakage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211459680.4A CN118057108A (en) | 2022-11-21 | 2022-11-21 | Treatment method for high temperature of shell of connecting pipe ripple compensator of external combustion type hot blast stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211459680.4A CN118057108A (en) | 2022-11-21 | 2022-11-21 | Treatment method for high temperature of shell of connecting pipe ripple compensator of external combustion type hot blast stove |
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| CN118057108A true CN118057108A (en) | 2024-05-21 |
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| CN202211459680.4A Pending CN118057108A (en) | 2022-11-21 | 2022-11-21 | Treatment method for high temperature of shell of connecting pipe ripple compensator of external combustion type hot blast stove |
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