CN114580680B - Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system - Google Patents
Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system Download PDFInfo
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Abstract
The invention relates to the technical field of hot blast stove maintenance, and particularly discloses a method for maintaining a temperature field system of an external combustion type hot blast stove vault connecting pipe. The method comprises the following steps: acquiring the expansion joint widths of a heavy working layer, a first insulating layer, a second insulating layer and a third insulating layer; then detaching all layers of the hot blast furnace vault interconnecting pipe except the two supporting port sections, and repairing the spraying layer on the surface of the interconnecting pipe steel shell; adjusting the expansion ratio of each layer, and limiting the ratio of the total expansion joint width of the layer to the original expansion joint width after adjusting each expansion joint to a certain multiple of the original expansion joint; and finally, building a third heat-insulating layer, a second heat-insulating layer, a first heat-insulating layer and a heavy working layer in a layered manner again, and filling all expansion gaps with filling fibers. The method performs accounting optimization on the expansion gap structure and the expansion amount of each layer, controls the total expansion gap and the blow-by gas channel, realizes stable control on the hot blast stove vault connecting pipe, and prolongs the service life of the hot blast stove vault connecting pipe.
Description
Technical Field
The invention relates to the technical field of hot blast stove maintenance, in particular to a method for maintaining a temperature field system of an external combustion type hot blast stove vault connecting pipe.
Background
The vault interconnecting pipe belongs to the most special and weak structure of an external combustion hot blast stove, has the stress of expanding during air supply and contracting twenty-four times a day during non-air supply (burning), and acts repeatedly and periodically day after day and year after year. In order to absorb the stress, besides the corrugated expansion joint is arranged on the steel shell, an expansion gap is also arranged at the position of a refractory brick structure in the steel shell.
If the single expansion gap is arranged in the transverse stress field of the connecting pipe to be too narrow, the expansion space is easy to be insufficient, refractory bricks on two sides of the expansion gap are mutually extruded, peeled or damaged, even the refractory material of the arch crown connecting pipe is seriously displaced and inclined in the transverse direction, the refractory material structure in the arch crown connecting pipe is collapsed, the service life of the hot blast stove is shortened if the refractory material structure is light, and malignant accidents such as burning-through of the arch crown connecting pipe, explosion of the hot blast stove and the like occur if the refractory material structure is heavy. If the single expansion gap is too wide, the expansion spaces of the refractory bricks on two sides of the expansion gap are easily too large, and if the defects of low refractoriness, large contractibility and the like of the filled refractory fibers are overcome, the burning loss of the insulating bricks and the overhigh surface temperature of the dome crown connecting pipe steel shell can be caused by the movement of high-temperature and high-pressure air flow during air supply. If the number of expansion joints arranged on the arch crown connecting pipe refractory material in the transverse direction is too small, the connecting pipe middle part refractory material is enabled to be transversely displaced and dislocated towards the arch crown ports at the two ends, and the arch crown refractory material is poor in structural stability and even can collapse. If the number of expansion joints arranged on the refractory material of the arch crown connecting pipe in the transverse direction is too large, the possibility of high-temperature and high-pressure airflow channeling during air supply is increased, so that the burning loss of the insulating brick is aggravated, and even the surface temperature of the steel shell of the arch crown connecting pipe is uncontrollable.
The reasons for causing the external combustion stove crown connecting pipe temperature field to override the control standard are as follows:
1) The single expansion gap of each layer of refractory bricks is too wide and is larger than the maximum expansion amount of the refractory bricks on the two sides;
2) The performance of the filling fiber in the expansion joint (especially the working temperature, the heat conductivity coefficient, the shrinkage rate of a heating wire and the like) cannot meet the working condition requirement.
The problems of unreasonable arrangement of internal refractory materials, structural defects and the like of the external combustion type hot blast stove cannot be solved in daily operation, once the insulating brick is seriously burnt due to overlong delay time, serious accidents such as redness or burnthrough of a connecting pipe can occur, and serious loss is caused. Therefore, when the external combustion type hot blast stove has a maintenance opportunity, a method for controlling a system of the temperature field of the connecting pipe at the vault of the external combustion type hot blast stove is urgently needed, and systematic optimization is carried out from the source and the structural design.
Disclosure of Invention
The invention aims to provide a method for maintaining a temperature field system of an external combustion type hot blast stove vault connecting pipe so as to control the hot blast stove vault connecting pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a maintenance method for a temperature field system of an external combustion type hot blast stove vault connecting pipe comprises the following steps:
s10, acquiring the width of a first heat-insulating layer expansion joint, the width of a second heat-insulating layer expansion joint, the width of a third heat-insulating layer expansion joint, the width of a sliding joint, the width of two edge expansion joints and the width of two middle expansion joints of a hot blast stove vault connecting pipe;
s20, disassembling a heavy working layer, a first heat-insulating layer, a second heat-insulating layer and a third heat-insulating layer of the contact pipe of the vault of the hot blast stove except two supporting port sections, and repairing a spraying layer on the surface of a steel shell of the contact pipe;
s30, adjusting the expansion ratio of the heavy working layer to be within a first expansion threshold range; enabling the width of the edge expansion joint to be K times of the original width, enabling K to be within a first width threshold range, enabling the width of the middle expansion joint to be L times of the original width, enabling L to be within a second width threshold range, and enabling the width of the sliding joint to be kept unchanged;
s39, calculating the ratio M of the total expansion joint width of the heavy working layer to the original width, judging whether the M is in a first ratio threshold range, if so, continuing to step S40, and if not, returning to step S30;
s40, adjusting the expansion ratio of the first heat-preservation layer to be within a second expansion threshold range; enabling the width of the expansion joint of the first heat preservation layer to be N times of the original width, wherein N is within a third width threshold range;
s49, calculating the ratio P of the total expansion joint width of the first heat-preservation layer to the original ratio, judging whether P is in the range of a second ratio threshold value, if so, continuing to step S50, and if not, returning to step S40;
s50, adjusting the expansion ratio of the second heat-insulating layer to be within a third expansion threshold range; enabling the width of the expansion joint of the second insulating layer to be Q times of the original width, wherein Q is within a fourth width threshold range;
s59, calculating the ratio R of the total expansion joint width of the second heat-insulating layer to the original ratio, judging whether R is in the range of a third ratio threshold, if so, continuing to step S60, otherwise, returning to step S50;
s60, adjusting the expansion ratio of the third heat-insulating layer to be within a fourth expansion threshold range; enabling the width of the expansion joint of the third insulating layer to be T times of the original width, wherein T is within a fifth width threshold range;
s69, calculating the ratio U of the total expansion joint width of the third heat-insulating layer to the original ratio, judging whether U is in the range of a fourth ratio threshold value, if so, continuing to step S70, and if not, returning to step S60;
s70, building the third insulating layer, the second insulating layer, the first insulating layer and the heavy working layer by layer again, and filling fibers in all expansion gaps.
As a preferred technical scheme of the maintenance method of the external combustion type hot blast stove vault interconnecting pipe temperature field system, the step S40 comprises the following detailed steps:
s41, changing the number of the expansion joints of the first heat-preservation layer into four.
As a preferred technical scheme of the maintenance method of the external combustion type hot blast stove vault interconnecting pipe temperature field system, the step S50 comprises the following detailed steps:
s51, changing the number of the expansion joints of the second insulating layer into four.
As a preferred technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the step S60 comprises the following detailed steps:
s61, changing the number of the expansion joints of the third insulating layer into four.
As the preferable technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the first expansion threshold range is 4.2% -4.7%, and the first ratio threshold range is 89% -92%.
As a preferable technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the first width threshold range is 89% -93%, and the second width threshold range is 84% -86%.
As the preferable technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the second expansion threshold range is 3.1% -3.3%, and the second ratio threshold range is 59% -61%.
As a preferable technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the third width threshold range is 89% -91%.
As a preferable technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the third expansion threshold range and the fourth expansion threshold range are both 2.6% -2.7%, and the third ratio threshold range and the fourth ratio threshold range are both 58% -59%.
As an optimal technical scheme of the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system, the fourth width threshold range and the fifth width threshold range are both 89% -91%.
The invention has the beneficial effects that:
the maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system calculates the hot blast stove vault connecting pipe temperature field, specifically calculates and optimizes the arrangement structure and the expansion amount of each layer of expansion joint of the hot blast stove vault connecting pipe, and controls the total expansion joint and the air blow-by channel on the premise of ensuring that the hot blast stove vault connecting pipe can work normally and the performance is unchanged. The method is implemented when the hot blast stove is maintained, so that the accurate maintenance of the hot blast stove vault connecting pipe can be realized, and the purpose of prolonging the service life of the hot blast stove vault connecting pipe is further achieved. The method fills the gap of the prior art, reduces the workload of constructors, can effectively finish the maintenance of the crown connecting pipe of the external combustion hot blast stove, and is convenient to be applied in engineering practice.
Drawings
Fig. 1 is a flow chart of a method for maintaining a temperature field system of a communication pipe of an external combustion type hot blast stove vault according to an embodiment of the invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the external combustion type hot blast stove vault interconnecting pipe temperature field system, the pipe wall of the external combustion type hot blast stove vault interconnecting pipe comprises a heavy working layer, a first heat preservation layer, a second heat preservation layer, a third heat preservation layer and an interconnecting pipe steel shell which are sequentially arranged from inside to outside; a spraying layer is arranged on the surface of the repaired connecting pipe steel shell; the outer surface of the heavy working layer is built by heavy seam-pressing bricks, the layer formed by the heavy seam-pressing bricks is sleeved with an inner layer, the inner layer is built by sliding seam-pressing bricks, and the heavy seam-pressing bricks and the sliding seam-pressing bricks are usually made of low-creep DRL-145. The first heat preservation layer is built by the insulating brick of first material and is built, and the second heat preservation layer is built by the insulating brick of second material and is built by the insulating brick of third material and form, and the third heat preservation is built by the insulating brick of third material and is built.
The heavy working layer is provided with two edge expansion joints respectively close to the two support port sections, a sliding joint in the middle and two middle expansion joints respectively arranged on two sides of the sliding joint. The total expansion joint width of the heavy working layer is defined as the sum of the width of the slip joint, the width of the two edge expansion joints and the width of the two middle expansion joints. According to the analysis of the stress field of the connecting pipe at the vault of the external combustion hot blast stove, the deformation quantity of the two middle expansion joints is the largest, and the sliding joint is a stressed part.
The first insulation layer is provided with a plurality of first insulation layer expansion joints, and the total expansion joint width of the first insulation layer is defined as the sum of the widths of all first insulation layer expansion joints. The second insulating layer is provided with a plurality of second insulating layer expansion joints, and the total expansion joint width of the second insulating layer is defined as the sum of the widths of all the second insulating layer expansion joints. The third insulating layer is provided with a plurality of third insulating layer expansion joints, and the total expansion joint width of the third insulating layer is defined as the sum of the widths of all the third insulating layer expansion joints. In the prior art, six expansion joints of the first insulation layer, the second insulation layer and the third insulation layer are generally arranged.
The ratio of the width of the dilatation joint to the length of the corresponding tube in which the refractory bricks are laid is defined as the expansion ratio of the layer.
When the heavy working layer has the problems of over width and poor quality of filling fibers, high-temperature and high-pressure air flows to the periphery of the expansion joint to move during air supply, so that the temperature field of the arch crown connecting pipe is increased. Analysis is carried out according to the longitudinal temperature field of the vault interconnecting pipe, and therefore the heavy working layer is in direct contact with high-temperature fluid and has the highest requirement on high-temperature performance adaptability, and then the heavy working layer is lowered layer by layer according to the sequence from the first heat preservation layer, the second heat preservation layer to the third heat preservation layer. The overall expansion amount of each layer is in direct proportion with the temperature gradient, so that the expansion amount of the connecting pipe in the transverse direction is gradually reduced according to the sequence from the working layer, the first heat-insulating layer, the second heat-insulating layer to the third heat-insulating layer.
Under the normal working condition of the external combustion type hot blast stove, the total expansion amount of the connecting pipe in the transverse direction is controlled in a mode of optimizing the setting position and the number of expansion joints while the width of a single expansion joint is controlled in the longitudinal direction of the dome crown connecting pipe insulating brick structure.
As shown in fig. 1, the present embodiment provides a method for maintaining a temperature field system of an external combustion type hot blast stove vault connecting pipe, which includes the following steps:
the method comprises the following steps: the method comprises the steps of obtaining the width of a first heat-insulating layer expansion joint, the width of a second heat-insulating layer expansion joint, the width of a third heat-insulating layer expansion joint, the width of a sliding joint, the width of two edge expansion joints and the width of two middle expansion joints of a hot blast stove arch crown connecting pipe.
Step two: and (3) disassembling the heavy working layer, the first heat-insulating layer, the second heat-insulating layer and the third heat-insulating layer of the hot blast furnace vault connecting pipe except for the two supporting port sections, and repairing the spraying layer on the surface of the steel shell of the connecting pipe.
Step three: adjusting the expansion ratio of the heavy working layer to be within a first expansion threshold range; the width of the edge expansion joint is K times of the original width, K is within the range of the first width threshold value, the width of the middle expansion joint is L times of the original width, L is within the range of the second width threshold value, and the width of the sliding joint is kept unchanged.
Step four: and calculating the ratio M of the total expansion gap width of the heavy working layer to the original width, judging whether the M is in the range of a first ratio threshold, if so, continuing the step five, and if not, returning to the step three.
Step five: adjusting the expansion ratio of the first heat-preserving layer to be within a second expansion threshold range; and enabling the width of the expansion joint of the first heat-preservation layer to be N times of the original width, wherein N is within the range of a third width threshold value.
Step six: and calculating the ratio P of the total expansion joint width of the first heat preservation layer to the original width, judging whether P is in a second ratio threshold range, if so, continuing the step seven, and if not, returning to the step five.
Step seven: adjusting the expansion ratio of the second insulating layer to be within a third expansion threshold range; the width of the expansion joint of the second insulating layer is Q times of the original width, and Q is within the range of a fourth width threshold value.
Step eight: and calculating the ratio R of the total expansion joint width of the second heat-insulating layer to the original ratio, judging whether R is in the range of a third ratio threshold value, if so, continuing the step nine, and if not, returning to the step seven.
Step nine: adjusting the expansion ratio of the third insulating layer to be within a fourth expansion threshold range; the width of the expansion joint of the third insulating layer is T times of the original width, and T is within the range of a fifth width threshold value.
Step ten: and calculating the ratio U of the total expansion joint width of the third heat-insulating layer to the original ratio, judging whether U is in the range of a fourth ratio threshold value, if so, continuing the step eleven, and if not, returning to the step nine.
Step eleven: and building a third heat-insulating layer, a second heat-insulating layer, a first heat-insulating layer and a heavy working layer in a layered manner again, and filling fibers in all expansion gaps.
The maintenance method of the external combustion type hot blast stove vault connecting pipe temperature field system calculates the hot blast stove vault connecting pipe temperature field, specifically calculates and optimizes the arrangement structure and the expansion amount of each layer of expansion joint of the hot blast stove vault connecting pipe, and controls the total expansion joint and the air blow-by channel on the premise of ensuring that the hot blast stove vault connecting pipe can work normally and the performance is unchanged. The method is implemented when the hot blast stove is maintained, so that the accurate maintenance of the hot blast stove vault connecting pipe can be realized, and the purpose of prolonging the service life of the hot blast stove vault connecting pipe is further achieved. The method fills the gap of the prior art, reduces the workload of constructors, can effectively finish the maintenance of the connecting pipe of the vault of the external combustion hot blast stove, and is convenient to be applied in engineering practice.
The design of not demolishing firebrick of each layer of two support port sections of hot-blast furnace vault interconnecting pipe has ensured the stability of the resistant material structure of vault, has reduced the risk that external combustion formula hot-blast furnace vault interconnecting pipe bursts apart and damages by a wide margin, has ensured the safety of constructor when carrying out maintenance operation. Through the mode of restoreing the spraying layer on contact pipe box hat surface, reduced contact pipe box hat damage and ruptured risk, guaranteed that the contact pipe box hat can work smoothly, and then prolonged the life of hot-blast furnace vault contact pipe. By filling the fiber in the expansion gap, the stability of the control of the temperature field of the connecting pipe of the vault of the external combustion type hot blast stove can be improved.
In this embodiment, the width of the first heat preservation layer expansion joint, the width of the second heat preservation layer expansion joint, the width of the third heat preservation layer expansion joint, the width of the sliding joint, the widths of the two edge expansion joints and the widths of the two middle expansion joints of the hot blast stove vault interconnecting pipe are determined by the original design institute, and specific data are directly obtained from the design institute.
Preferably, when the re-layering is performed, the laying is performed from the non-vault opening and closing door bricks side to the closing door bricks side. The method considers the difference characteristic of whether each layer of the re-built refractory bricks are re-burnt or not with the original undetached refractory bricks at two supporting port sections of the crown connecting pipe of the hot blast stove. The new and old connector parts are arranged according to the expansion gaps, so that the structural stability of the new and old connector refractory materials in the transverse direction of the hot blast stove vault connecting pipe can be guaranteed. Specifically, other expansion gaps are transversely arranged on the connecting pipe of the dome of the hot blast stove in an alternately staggered mode.
Preferably, when the heavy working layer is built in a layering way, the materials of the heavy seam pressing bricks and the sliding seam pressing bricks are replaced by the materials with low creep deformation, and the specific model is DRL-150. The stability of the control of the temperature field of the connecting pipe at the vault of the external combustion hot blast stove can be further improved by adjusting the materials of the heavy seam pressing bricks and the sliding seam pressing bricks.
Preferably, the material of the filling fiber should satisfy the following requirements: the temperature of the long-term working is more than or equal to 1400 ℃, the content of zirconium dioxide is more than or equal to 15.0 percent, the heat conductivity coefficient is less than or equal to 0.153W/m.K under the condition of 500 +/-10 ℃, and the shrinkage rate of a heating wire is less than or equal to-3.0 percent under the condition of 1350 ℃ multiplied by 24 h.
In this embodiment, step five includes the following detailed steps: the number of expansion joints of the first heat preservation layer is changed into four. The seventh step comprises the following detailed steps: the number of the expansion joints of the second insulating layer is changed into four. The ninth step comprises the following detailed steps: the number of the expansion joints of the third insulating layer is changed into four. Become the design of four with the quantity of the expansion joint of each heat preservation expansion joint, can reduce the quantity of heat preservation expansion joint under the prerequisite of guaranteeing that hot-blast stove vault connecting pipe can normally work and the performance is unchangeable, can reduce constructor's work load from this by a wide margin, and then can promote the efficiency of maintaining the operation.
In other embodiments of this embodiment, the number of the expansion joints of the insulating layer is other positive integers not equal to four. The selection of the number of the expansion joints of the heat insulation layer is determined by the total expansion joint width of the corresponding heat insulation layer and the maximum value of the width of the expansion joint of the single heat insulation layer, and the number of the expansion joints of the heat insulation layer is reduced as much as possible on the premise of avoiding the width of the expansion joint of the heat insulation layer from exceeding the maximum value. The specific determination method is common knowledge in the art, and is well known to those skilled in the art, and will not be described herein.
In this embodiment, the first expansion threshold range is 4.2% -4.7%, and the first ratio threshold range is 89% -92%; the first width threshold range is 89% -93%, and the second width threshold range is 84% -86%; the second expansion threshold range is 3.1% -3.3%, and the second ratio threshold range is 59% -61%; the third width threshold range is 89% -91%; the third expansion threshold range and the fourth expansion threshold range are both 2.6% -2.7%, and the third ratio threshold range and the fourth ratio threshold range are both 58% -59%; the fourth width threshold range and the fifth width threshold range are both 89% -91%.
The method can be widely applied to the control of the temperature field system of the crown connecting pipe of the external combustion hot blast stove in the large, medium and small blast furnaces in the iron-making industry, and can be implemented by the opportunity of shutdown maintenance of the hot blast stove, thereby realizing the accurate maintenance of the crown connecting pipe of the hot blast stove and prolonging the service life of the crown connecting pipe of the hot blast stove. The method has the advantages of less maintenance workload, good maintenance effect and good popularization significance.
Taking 2200 cubic meters of blast furnace external combustion type hot blast stove vault interconnecting pipe maintenance as an example:
the width of the two edge expansion joints is adjusted from 53 mm to 48 mm, the width of the sliding joint is kept unchanged, and the width of the two middle expansion joints is adjusted from 20 mm to 17 mm. The expansion ratio of the heavy working layer is adjusted to 4.2-4.7%.
The width of the expansion joint of the first heat preservation layer is adjusted from 30 mm to 27 mm, and the expansion ratio of the expansion joint of the first heat preservation layer is adjusted to 3.1% -3.3%.
The expansion joints of the second heat-insulating layer and the third heat-insulating layer are changed into four from six, the width of the expansion joints of the second heat-insulating layer and the third heat-insulating layer is adjusted to 22 mm from 25 mm, and the expansion ratio of the second heat-insulating layer to the third heat-insulating layer is adjusted to 2.6% -2.7%.
The heavy seam-pressing bricks and the sliding seam-pressing bricks are changed from the low-creep material of DRL-145 model to the low-creep material of DRL-150 model.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A maintenance method for a temperature field system of an external combustion type hot blast stove vault connecting pipe is characterized by comprising the following steps:
s10, acquiring the width of a first heat-insulating layer expansion joint, the width of a second heat-insulating layer expansion joint, the width of a third heat-insulating layer expansion joint, the width of a sliding joint, the width of two edge expansion joints and the width of two middle expansion joints of a connecting pipe of the vault of the hot blast stove;
s20, disassembling a heavy working layer, a first insulating layer, a second insulating layer and a third insulating layer of the hot blast stove vault connecting pipe except for two supporting port sections, and repairing a spraying layer on the surface of a steel shell of the connecting pipe;
s30, adjusting the expansion ratio of the heavy working layer to be within a first expansion threshold range; enabling the width of the edge expansion joint to be K times of the original width, wherein K is within a first width threshold range, the width of the middle expansion joint is L times of the original width, L is within a second width threshold range, and the width of the sliding joint is kept unchanged;
s39, calculating the ratio M of the total expansion joint width of the heavy working layer to the original width, judging whether the M is in the range of a first ratio threshold, if so, continuing to step S40, otherwise, returning to step S30;
s40, adjusting the expansion ratio of the first heat-preservation layer to be within a second expansion threshold range; enabling the width of the expansion joint of the first heat preservation layer to be N times of the original width, wherein N is within a third width threshold range;
s49, calculating the ratio P of the total expansion joint width of the first heat preservation layer to the original width, judging whether P is in a second ratio threshold range, if so, continuing to step S50, otherwise, returning to step S40;
s50, adjusting the expansion ratio of the second heat-insulating layer to be within a third expansion threshold range; enabling the width of the expansion joint of the second insulating layer to be Q times of the original width, wherein Q is within a fourth width threshold range;
s59, calculating the ratio R of the total expansion joint width of the second heat-insulating layer to the original ratio, judging whether R is in the range of a third ratio threshold, if so, continuing to step S60, otherwise, returning to step S50;
s60, adjusting the expansion ratio of the third heat-insulating layer to be within a fourth expansion threshold range; enabling the width of the expansion joint of the third insulating layer to be T times of the original width, wherein T is within a fifth width threshold range;
s69, calculating the ratio U of the total expansion joint width of the third heat-insulating layer to the original ratio, judging whether U is in the range of a fourth ratio threshold value, if so, continuing to step S70, and if not, returning to step S60;
s70, building the third insulating layer, the second insulating layer, the first insulating layer and the heavy working layer by layer again, and filling fibers in all expansion gaps.
2. The method for maintaining the temperature field system of the external combustion hot blast stove vault interconnection pipe of claim 1, wherein step S40 includes the following detailed steps:
s41, changing the number of the expansion joints of the first heat preservation layer into four.
3. The method for maintaining the external combustion type hot blast stove vault communication pipe temperature field system according to claim 1, wherein the step S50 includes the following detailed steps:
s51, changing the number of the expansion joints of the second insulating layer into four.
4. The method for maintaining the external combustion type hot blast stove vault communication pipe temperature field system according to claim 1, wherein the step S60 includes the following detailed steps:
s61, changing the number of the expansion joints of the third insulating layer into four.
5. The method for maintaining the temperature field system of the external combustion type hot blast stove vault interconnection pipe according to claim 1, wherein the first expansion threshold range is 4.2% -4.7%, and the first ratio threshold range is 89% -92%.
6. The method of claim 1, wherein the first width threshold range is 89% -93% and the second width threshold range is 84% -86%.
7. The method of claim 1, wherein the second expansion threshold is in a range of 3.1% -3.3%, and the second ratio threshold is in a range of 59% -61%.
8. The method of claim 1, wherein the third width threshold is in a range of 89% -91%.
9. The method of claim 1, wherein the third expansion threshold range and the fourth expansion threshold range are both 2.6% -2.7%, and the third ratio threshold range and the fourth ratio threshold range are both 58% -59%.
10. The method of claim 1, wherein the fourth width threshold range and the fifth width threshold range are both 89% -91%.
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| CN202210320385.4A CN114580680B (en) | 2022-03-29 | 2022-03-29 | Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system |
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| CN202210320385.4A CN114580680B (en) | 2022-03-29 | 2022-03-29 | Maintenance method for external combustion type hot blast stove vault connecting pipe temperature field system |
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| CN114580680A CN114580680A (en) | 2022-06-03 |
| CN114580680B true CN114580680B (en) | 2023-01-06 |
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| US5494026A (en) * | 1993-06-23 | 1996-02-27 | Kawasaki Steel Corporation | Dome connecting structure of external combustion hot stove for blast furnace |
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| CN103409573A (en) * | 2013-08-16 | 2013-11-27 | 北京首钢国际工程技术有限公司 | Masonry structure of refractory material in hot-blast stove warm-air pipe ripple compensator |
| CN212315913U (en) * | 2020-09-22 | 2021-01-08 | 吴江南玻玻璃有限公司 | Expansion joint processing structure for melting furnace arch top |
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| EP2534269B1 (en) * | 2010-02-12 | 2016-04-20 | Allied Mineral Products, Inc. | Hot blast stove dome and hot blast stove |
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| CN103409573A (en) * | 2013-08-16 | 2013-11-27 | 北京首钢国际工程技术有限公司 | Masonry structure of refractory material in hot-blast stove warm-air pipe ripple compensator |
| CN212315913U (en) * | 2020-09-22 | 2021-01-08 | 吴江南玻玻璃有限公司 | Expansion joint processing structure for melting furnace arch top |
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