CN114277207B - Method for quickly jointing hot air pipelines of newly-built hot-blast stove of blast furnace - Google Patents
Method for quickly jointing hot air pipelines of newly-built hot-blast stove of blast furnace Download PDFInfo
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- CN114277207B CN114277207B CN202111606479.XA CN202111606479A CN114277207B CN 114277207 B CN114277207 B CN 114277207B CN 202111606479 A CN202111606479 A CN 202111606479A CN 114277207 B CN114277207 B CN 114277207B
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Abstract
The invention discloses a method for quickly jointing hot air pipelines of a newly-built hot-blast stove of a blast furnace, which comprises the following steps: step 1: and (3) when the vault temperature and the waste flue gas temperature of the tail-end hot blast stove reach preset temperatures, step 2: damping down the iron-making blast furnace, plugging an air inlet of a hot blast bustle pipe of the iron-making blast furnace, and step 3: dismantling the steel shell of the original plug of the hot air main pipe to be maintained, and step 4: opening a backflow damping valve of a hot air main pipe to be maintained, dismantling a refractory brick in the inner cavity of the plug to form a butt joint, and performing step 5: generating negative pressure, step 6: plugging, step 7: closing the high-temperature fan, the tail end hot-blast valve and the backflow damping-down valve, and step 8: carrying out linking, and step 9: closing the high-temperature fan and the backflow damping-down valve to complete the jointing; the invention realizes the safe and fast butt joint of the hot air pipeline of the newly-built hot air furnace, simultaneously does not need to greatly reduce the temperature of the hot air pipeline of the original system, and meets the requirement of safe and efficient operation of the newly-built hot air furnace of the blast furnace.
Description
Technical Field
The invention belongs to the field of blast furnace technology, and particularly relates to a method for quickly jointing stubbles of hot air pipelines of a newly-built hot air furnace of a blast furnace.
Background
The large-scale of modern iron-making blast furnace, the requirement to hot-blast furnace wind temperature is higher and higher, along with the extension of service life, the check brick slagging of hot-blast furnace is blockked up, the crown brick damages, and it is big to influence the blast furnace production index, must carry out the overhaul to the hot-blast furnace. The hot blast stove for overhaul needs to be stopped for maintenance, the construction period is long, the use level of the air temperature of the hot blast stove can be greatly reduced, the safe operation and the production cost of the blast furnace are greatly influenced, in order to realize the economic maintenance and improve the economic index of the maintained hot blast stove, a newly-built hot blast stove is generally adopted, and then the hot blast stove with problems is alternately overhauled; the construction and operation of the newly-built hot blast stove need to be in butt joint with all pipelines of the hot blast stove of the original system, wherein the hot blast pipe butt joint stubble is the largest in construction difficulty and the highest in risk, the butt joint construction of the common hot blast pipe needs 6-7 days, the construction time is long, the temperature of the hot blast pipe of the original system is greatly reduced, and the influence on the structural stability of the hot blast pipe of the original system is huge.
Disclosure of Invention
The invention aims to provide a method for quickly jointing a hot air pipeline of a newly-built blast furnace, which aims to solve the problems that the existing method for jointing the hot air pipeline has long construction time, greatly reduces the temperature of the hot air pipeline of the original system and has great influence on the structural stability of the hot air pipeline of the original system.
The invention adopts the following technical scheme: a method for quickly jointing hot air pipelines of a newly-built hot blast stove of a blast furnace comprises the following steps:
step 1: when the vault temperature and the waste flue gas temperature of the tail end hot blast stove reach preset temperatures,
step 2: damping down the iron-making blast furnace, plugging the air inlet of the bustle pipe of the iron-making blast furnace,
and 3, step 3: the steel shell of the original plug of the hot blast main pipe to be maintained is removed, wherein the plug consists of the steel shell positioned at the periphery and refractory bricks which surround the inner wall of the steel shell for a circle,
and 4, step 4: opening a backflow damping valve of a hot air main pipe to be maintained, removing refractory bricks in the inner cavity of the plug to form a butt joint port,
and 5: a negative pressure hole is arranged at the position of the lower end of the tail end hot blast stove close to the waste smoke valve, the tail end hot blast stove is communicated with the high temperature fan through the negative pressure hole and a pipeline, the tail end hot blast stove is opened to lead to a tail end hot blast valve of a hot blast main pipe to be maintained, so that high temperature air of the tail end hot blast stove passes through the negative pressure hole from top to bottom, negative pressure is generated under the suction force of the high temperature fan,
step 6: the butt joint is plugged by high-temperature cellucotton, then is plugged by a refractory brick,
and 7: the high temperature fan, the tail end hot blast valve and the back flow damping-down valve are closed,
and 8: connecting a hot air main pipe to be maintained with a newly-built hot air main pipe,
and step 9: and closing the high-temperature fan and the backflow damping-down valve to complete the jointing of the stubbles.
Further, in step 1, the preset temperature of the vault temperature of the tail end hot blast stove is 1200 ℃, and the preset temperature of the waste flue gas temperature is 380 ℃.
Further, in step 3, a heat source inlet of the iron-making blast furnace is communicated with a heat source outlet of the tail end hot blast furnace through a hot blast main pipe to be maintained, a connection point of the hot blast main pipe to be maintained and a newly built hot blast main pipe is a butt joint, and a plug is arranged at the tail end of the hot blast main pipe to be maintained.
Further, in the step 5, a gas inlet valve, an air inlet valve, a waste flue gas valve and a cold air valve of the tail end hot blast stove are closed, and hot blast valves of other hot blast stoves leading to a hot blast main pipe to be maintained are closed.
Further, the ligation method in step 8 consists of the following steps:
step 801: welding the steel shell at the tail end of the hot air main pipe to be maintained and the steel shell of the newly-built hot air main pipe, reserving a construction hole at the top of the newly-built hot air main pipe,
the steps of 802: spraying refractory material at the interface between the main hot blast pipe to be maintained and the newly built main hot blast pipe, laying bricks from bottom to top around the interface until reaching the position of the construction hole,
step 803: opening the high temperature fan, the tail end hot blast valve and the back flow damping-down valve,
step 804: the high-temperature cellucotton and the refractory bricks blocked at the butt joint are removed,
step 805: and placing an arc-shaped plate with the same aperture as the construction hole on a refractory brick positioned at the butt joint, pouring high-temperature refractory concrete on the arc-shaped plate, and then sealing the top of the concrete by using a steel plate.
The invention has the beneficial effects that: the invention realizes the safe and fast butt joint of the hot air pipeline of the newly-built hot air furnace, simultaneously does not need to greatly reduce the temperature of the hot air pipeline of the original system, and meets the requirement of safe and efficient operation of the newly-built hot air furnace of the blast furnace; the invention has low on-site construction difficulty and small risk, and the hot air pipeline has high speed and good effect on the joint stubbles.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a tail end hot blast stove; 2. an iron-making blast furnace; 3. a hot air surrounding pipe; 4. a hot air main pipe to be maintained; 5. a back flow damping-down valve; 6. a butt joint port; 7. a tail end hot air valve; 8. and (5) newly building a hot air main pipe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a method for quickly jointing stubble of a hot air pipeline of a newly-built blast furnace, which comprises the following steps of:
step 1: when the vault temperature of the tail end hot blast stove 1 is more than 1200 ℃, the temperature of the waste flue gas is more than 380 ℃.
Step 2: the method comprises the steps of damping down the iron-making blast furnace 2 and plugging an air inlet of a hot blast bustle pipe 3 of the iron-making blast furnace 2.
And step 3: the steel shell of the original plug of the hot air main pipe 4 to be maintained is removed, wherein a heat source inlet of the iron-making blast furnace 2 is communicated with a heat source outlet of the tail end hot air furnace 1 through the hot air main pipe 4 to be maintained, a connection point of the hot air main pipe 4 to be maintained and a newly-built hot air main pipe 8 is a butt joint port 6, the tail end of the hot air main pipe 4 to be maintained is provided with the plug, and the plug is composed of a steel shell positioned on the periphery and refractory bricks which surround the inner wall of the steel shell for one circle.
And 4, step 4: and opening a backflow damping-down valve 5 of the hot air main pipe 4 to be maintained, and removing refractory bricks in the inner cavity of the plug to form a butt joint port 6.
And 5: set up the negative pressure hole in the position that the lower extreme at terminal hot-blast furnace 1 is close to the waste flue gas valve, terminal hot-blast furnace 1 is linked together with high temperature fan through negative pressure hole and pipeline, open terminal hot-blast furnace 1 and accesss to the terminal hot-blast valve 7 of waiting to maintain hot-blast house steward 4, make the high temperature air of terminal hot-blast furnace 1 from the top down through the negative pressure hole, produce the negative pressure under the suction of high temperature fan, when producing the negative pressure, close the coal gas admission valve of terminal hot-blast furnace 1, the air admission valve, waste flue gas valve and cold air valve, close other hot-blast furnaces and accesss to the hot-blast valve of waiting to maintain hot-blast house steward 4.
Step 6: the interface 6 is plugged by high temperature fiber cotton, and then plugged by firebrick.
And 7: and closing the high-temperature fan, the tail end hot-blast valve 7 and the backflow damping-down valve 5.
And 8: and connecting the hot air main pipe 4 to be maintained with the newly-built hot air main pipe 8.
And step 9: the high-temperature fan and the backflow damping-down valve 5 are closed, and then the stubble jointing can be completed.
Wherein the linking method in step 8 comprises the following steps:
step 801: welding the steel shell at the tail end of the hot air main pipe 4 to be maintained and the steel shell of the newly-built hot air main pipe 8, reserving a construction hole at the top of the newly-built hot air main pipe 8,
the steps of 802: refractory material is sprayed at the interface of the hot blast main pipe 4 to be maintained and the newly-built hot blast main pipe 8, bricks are laid around the interface from bottom to top until reaching the position of a construction hole,
step 803: the high temperature fan, the tail end hot blast valve 7 and the backflow damping-down valve 5 are opened,
step 804: the high-temperature cellucotton and the refractory bricks plugged at the butt joint port 6 are removed,
step 805: placing the arc-shaped plate with the same aperture as the construction hole on the refractory brick positioned at the butt joint port 6, pouring high-temperature refractory concrete on the arc-shaped plate, and sealing the top of the concrete by using a steel plate.
The invention takes measures aiming at the local butt joint construction part of the hot air pipeline, utilizes the backflow damping valve 5 and the high-temperature fan to produce strong negative pressure at the butt joint port 6, controls the high-temperature environment in the hot air main pipe 4 to be maintained, and adopts high-temperature cellucotton and light insulating brick treatment for the butt joint port 6, creates safe operation environment for the butt joint port 6 of the hot air main pipe 4 to be maintained, and does not use the conventional thinking to take the integral cooling measure for the hot air main pipe 4 to be maintained, thereby consuming a long time, causing great influence on the stability of the hot air main pipe 4 to be maintained and burying hidden danger for the future hot air furnace production.
In order to improve the drawing force of the backflow damping down valve 5, the air inlet of the hot blast bustle pipe 3 of the iron-making blast furnace 2 is blocked, so that the influence of the air inlet at the part on the negative pressure generating efficiency of the backflow damping down valve 5 is avoided; in order to avoid the influence on the structural stability of the silica brick masonry of the hot blast stove due to large vault crown temperature reduction amplitude caused by large heat consumption of the vault crown of the hot blast stove, the invention utilizes the high-temperature fan and the tail end hot blast stove 1 to produce negative pressure, fully stores the heat of the tail end hot blast stove 1 before the blast stove stops blowing, and avoids the influence on the tail end hot blast stove 1 after the back blowing.
The method aims at the last construction step in the butt joint of the hot air main pipe, and the most key construction hole part adopts a steel plate suspended formwork pouring process, and compared with the traditional bricklaying process, the method has the characteristics of high efficiency, safety and capability of ensuring the quality requirement of butt joint pipelines; the invention uses high-temperature cellucotton and light insulating bricks as heat insulation layers at the butt joint port 6 of the maintenance hot blast main pipe 4, and has the characteristics of convenient construction and good heat insulation.
The construction position of the joint stubble between the newly-built hot air pipeline of the hot air furnace and the hot air main pipe 4 to be maintained is high in safety, the butt joint construction time is greatly shortened, the brick lining structure of the hot air main pipe 4 to be maintained is protected from being greatly cooled, and valuable production time and safety guarantee are provided for the blast furnace.
In order to form strong negative pressure at the construction part of the interface 6 of the hot air pipeline, the invention selects the hot air furnace 1 at the tail end closest to the maintenance hot air main pipe 4 and the high-temperature fan to manufacture negative pressure, the suction force generated naturally by the maintenance hot air main pipe 4 is combined with the mechanical work of the high-temperature fan to generate the suction force, the strong negative pressure effect formed at the construction part of the interface 6 is improved, and the invention is favorable for plugging the hot air main pipe 4 to be maintained.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for quickly jointing hot air pipelines of a newly-built hot blast stove of a blast furnace is characterized by comprising the following steps: step 1: when the vault temperature and the waste smoke temperature of the tail end hot blast stove (1) reach preset temperatures, step 2: damping down the iron-making blast furnace (2), plugging an air inlet of a hot blast bustle pipe (3) of the iron-making blast furnace (2), and performing step 3: dismantling a steel shell of an original plug of a hot air main pipe (4) to be maintained, wherein the plug consists of a steel shell positioned on the periphery and refractory bricks surrounding the inner wall of the steel shell for one circle, and the step 4: opening a backflow damping valve (5) of the hot air main pipe (4) to be maintained, and removing refractory bricks in the inner cavity of the plug to form a butt joint port (6), and 5: set up the negative pressure hole in the position that the lower extreme of terminal hot-blast furnace (1) is close to the waste flue gas valve, terminal hot-blast furnace (1) is linked together with high temperature fan through negative pressure hole and pipeline, opens terminal hot-blast furnace (1) and accesss to terminal hot-blast valve (7) of waiting to maintain hot-blast house steward (4) for the high temperature air of terminal hot-blast furnace (1) is from the top down through the negative pressure hole, produces the negative pressure under the suction of high temperature fan, step 6: plugging the interface (6) by using high-temperature cellucotton, and then plugging by using refractory bricks, wherein the step 7: closing the high-temperature fan, the tail end hot-blast valve (7) and the backflow damping-down valve (5), and step 8: connecting a hot air main pipe (4) to be maintained with a newly-built hot air main pipe (8), wherein the connecting method in the step 8 comprises the following steps: step 801: mutually welding a steel shell at the tail end of a hot air main pipe (4) to be maintained and a steel shell of a newly-built hot air main pipe (8), reserving a construction hole at the top of the newly-built hot air main pipe (8), and performing 802: spraying refractory materials at the interface of the hot blast main pipe (4) to be maintained and the newly-built hot blast main pipe (8), building bricks from bottom to top around the interface until the position of a construction hole is reached, and performing the following steps of 803: opening the high-temperature fan, the tail end hot-blast valve (7) and the backflow damping-down valve (5), and step 804: removing the high-temperature cellucotton and the refractory bricks plugged in the butt joint port (6), and step 805: placing an arc-shaped plate with the same aperture as the construction hole on a refractory brick positioned at the butt joint, pouring high-temperature refractory concrete on the arc-shaped plate, and then sealing the top of the concrete by using a steel plate; and step 9: the high-temperature fan and the backflow damping-down valve (5) are closed to complete the jointing of the stubbles.
2. The method for quickly jointing the stubbles of the hot-blast pipes of the newly-built blast furnace of the blast furnace according to the claim 1, characterized in that in the step 1, the preset temperature of the vault temperature of the tail end hot-blast furnace (1) is 1200 ℃, and the preset temperature of the waste flue gas temperature is 380 ℃.
3. The method for quickly jointing the hot air pipelines of the newly-built blast furnace of the blast furnace according to the claim 1, characterized in that in the step 3, the heat source inlet of the ironmaking blast furnace (2) is communicated with the heat source outlet of the tail blast furnace (1) through the hot air main pipe (4) to be maintained, the joint point of the hot air main pipe (4) to be maintained and the newly-built hot air main pipe (8) is the jointing port (6), and the tail end of the hot air main pipe (4) to be maintained is provided with a plug.
4. The method for quickly jointing the hot air pipelines of the newly-built blast furnace according to claim 1, wherein in the step 5, a gas inlet valve, an air inlet valve, a waste flue gas valve and a cold air valve of the tail end hot blast furnace (1) are closed, and hot air valves of other hot blast furnaces leading to a hot air main pipe (4) to be maintained are closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111606479.XA CN114277207B (en) | 2021-12-26 | 2021-12-26 | Method for quickly jointing hot air pipelines of newly-built hot-blast stove of blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111606479.XA CN114277207B (en) | 2021-12-26 | 2021-12-26 | Method for quickly jointing hot air pipelines of newly-built hot-blast stove of blast furnace |
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| CN114277207A CN114277207A (en) | 2022-04-05 |
| CN114277207B true CN114277207B (en) | 2022-11-29 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1235970A (en) * | 1984-05-04 | 1988-05-03 | Fred Bawel | Flue pipe connection |
| CN103374356B (en) * | 2012-04-25 | 2014-06-25 | 五冶集团上海有限公司 | Flue arch crown online opening pipe connecting method for smoke waste-heat utilization of coke oven |
| CN102703634A (en) * | 2012-06-11 | 2012-10-03 | 中冶南方工程技术有限公司 | Terminal compensation device for hot air pipeline of hot blast stove |
| CN211170733U (en) * | 2019-10-29 | 2020-08-04 | 张家港宏昌钢板有限公司 | Negative pressure device for overhauling blast furnace hot blast stove |
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