Online repair construction method for hot blast branch pipe of hot blast stove

Abstract

The invention relates to an online repair construction method for a hot blast branch pipe of a hot blast stove. The method comprises the following steps: damping down the hot blast stove connected with the hot blast branch pipe to be repaired; a hot air valve at the joint of the hot air branch pipe to be repaired and the hot air main pipe side branch pipe is removed, and a primary heat insulation blocking plate is installed on the hot air main pipe side branch pipe; a heat insulation wall is built on the to-be-repaired hot air branch pipe close to the hot air outlet of the air mixing chamber; dismantling the primary heat insulation plugging plate, and installing a simulation hot blast valve; the hot air branch pipe to be repaired is dismantled, and a new hot air branch pipe is installed; dismounting the simulation hot blast valve, and installing a secondary heat insulation plugging plate; the heat insulation wall and the secondary heat insulation plugging plate are removed, and a formal hot air valve is installed at the joint of the new hot air branch pipe and the hot air main pipe side branch pipe; by means of the arrangement, the hot air branch pipe can be repaired in a short time to meet the production condition while the high-temperature and stable state of the hot blast stove is maintained, the construction period is shortened while construction safety is ensured, and the construction efficiency of the hot blast stove is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot blast stove, in particular to a hot blast stove hot blast branch pipe online repair construction method. BACKGROUND

[0002] At present, the refractory material in the hot sealing branch pipe on both sides of the hot blast stove will age, fall off and other problems after long time working of the hot blast stove, which will seriously affect the hot blast branch pipe. In the process of repairing the hot blast branch pipe, the hot blast stove needs to be stopped running, and the operator needs to wear heat insulation clothes to repair when the temperature drops to a certain temperature. In the process of cooling the hot blast stove, the temperature needs to be lowered according to the temperature drop curve of the hot blast stove refractory material, which leads to long cooling cycle of the hot blast stove, increases the repair company and reduces the construction efficiency of the hot blast stove. SUMMARY

[0003] In view of the defects in the prior art, the present application aims to provide a hot blast stove hot blast branch pipe online repair construction method, which has the advantages of online hot-state repair of the hot blast stove hot blast branch pipe, maintenance of high temperature and stable state of the hot blast stove, repair of the hot blast branch pipe, avoidance of the risk of damage to the hot blast stove refractory material caused by large temperature change, shortening of the repair period and improvement of the construction efficiency of the hot blast stove.

[0004] The above application object of the present application is realized by the following technical scheme: a hot blast stove hot blast branch pipe online repair construction method, comprising the following steps:

[0005] Stopping the hot blast stove connected with the hot blast branch pipe to be repaired;

[0006] Removing the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe, and installing a primary heat insulation blocking plate at the hot blast main pipe side branch pipe;

[0007] Building a heat insulation wall at the position of the hot blast branch pipe to be repaired close to the hot blast outlet of the air mixing chamber;

[0008] Removing the primary heat insulation blocking plate and installing a simulated hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe;

[0009] Removing the hot blast branch pipe to be repaired and installing a new hot blast branch pipe;

[0010] Removing the simulated hot blast valve and installing a secondary heat insulation blocking plate at the hot blast main pipe side branch pipe;

[0011] Removing the heat insulation wall and the secondary heat insulation blocking plate, and installing an official hot blast valve at the connection between the new hot blast branch pipe and the hot blast main pipe side branch pipe.

[0012] Preferably, the hot blast stove hot blast branch pipe online repair construction method provided by the present application comprises the following steps of: removing a hot blast valve at a connection between a hot blast branch pipe to be repaired and a hot blast main pipe side branch pipe, and installing a one-time heat insulation blocking plate at the hot blast main pipe side branch pipe.

[0013] Opening a flue valve to form a negative pressure in the air mixing chamber.

[0014] Removing the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe.

[0015] Installing a one-time heat insulation blocking plate at a flange of the hot blast main pipe side branch pipe.

[0016] Preferably, the hot blast stove hot blast branch pipe online repair construction method provided by the present application comprises the following steps of: building a heat insulation wall at a position close to a hot blast outlet of the hot blast branch pipe to be repaired.

[0017] Opening a manhole of the air mixing chamber opposite to the hot blast branch pipe to be repaired, and building a pre-built wall by rolling a ceramic fiber blanket in one end of the hot blast branch pipe to be repaired close to the hot blast outlet of the air mixing chamber through the manhole of the air mixing chamber.

[0018] Forcedly cooling the hot blast branch pipe to be repaired by compressed air or water mist.

[0019] When the temperature in the hot blast branch pipe to be repaired reaches a preset temperature, a worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by sticking to the pre-built wall.

[0020] Preferably, the hot blast stove hot blast branch pipe online repair construction method provided by the present application comprises the following steps of: when the temperature in the hot blast branch pipe to be repaired reaches a preset temperature, a worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by sticking to the pre-built wall.

[0021] When the temperature in the hot blast branch pipe to be repaired reaches a preset temperature, a worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by sticking to the pre-built wall.

[0022] Strengthening the heat insulation wall by a steel structure at the outermost side of the heat insulation wall.

[0023] Preferably, the hot blast stove hot blast branch pipe online repair construction method provided by the present application, wherein the preset temperature ranges from 0 to 50 degrees.

[0024] Preferably, the hot blast stove hot blast branch pipe online repair construction method provided by the present application comprises the following steps of: removing the hot blast branch pipe to be repaired, and installing a new hot blast branch pipe.

[0025] Enter the hot air branch pipe to be repaired through the manhole on the simulated hot air valve, and remove the pipeline bricks and sprayed materials that need to be removed;

[0026] After the pipeline bricks and sprayed materials are removed, the steel structure of the hot air branch pipe to be repaired is cut off and a new hot air branch pipe is replaced;

[0027] Enter the new hot air branch pipe through the manhole on the simulated hot air valve, and spray the refractory bricks in the new hot air branch pipe.

[0028] Preferably, the hot blast stove hot air branch pipe online repair construction method provided by the application comprises the following steps:

[0029] Open the flue valve to form a negative pressure in the air mixing chamber, and remove the heat insulation wall at the same time;

[0030] After the new hot air branch pipe is cleaned, the secondary heat insulation blocking plate is removed, and a formal hot air valve is installed at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe.

[0031] Preferably, the hot blast stove hot air branch pipe online repair construction method provided by the application further comprises the following steps before the hot blast stove connected with the hot air branch pipe to be repaired is blown down:

[0032] Determine the refractory repair range according to the high-temperature abnormal area of the hot air branch pipe to be repaired and the refractory construction drawing;

[0033] According to the production requirements and the abnormal comprehensive situation of the hot air branch pipe to be repaired, determine the maintenance hot blast stove to ensure that three production hot blast stoves are repaired in turn while one hot blast stove is blown down.

[0034] Preferably, the hot blast stove hot air branch pipe online repair construction method provided by the application further comprises the following steps after the heat insulation wall and the secondary heat insulation blocking plate are removed and a formal hot air valve is installed at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe:

[0035] Blow up the hot blast stove blown down and produce.

[0036] Preferably, the hot blast stove hot air branch pipe online repair construction method provided by the application comprises the following steps of opening the manhole of the air mixing chamber opposite to the hot air branch pipe to be repaired, and building a pre-built wall with a ceramic fiber blanket roll in one end of the hot air branch pipe to be repaired close to the hot air outlet of the air mixing chamber:

[0037] S1031, open the manhole of the air mixing chamber opposite to the hot air branch pipe to be repaired;

[0038] S1032, clamp the ceramic fiber blanket roll through the mounting clip, and pass the end of the mounting clip provided with the ceramic fiber blanket roll through the air mixing chamber manhole into the hot air branch pipe to be repaired;

[0039] S1033, place the ceramic fiber blanket roll at one end of the hot air branch pipe to be repaired close to the hot air outlet of the air mixing chamber;

[0040] Repeat S1032-S1033 until the multiple ceramic fiber blanket rolls are built into a pre-built wall, and the air mixing chamber manhole is closed.

[0041] To sum up, the beneficial technical effects of the present application are: the hot air branch pipe online repair construction method of the hot blast furnace provided by the present application, comprising the following steps: stopping the hot blast furnace connected with the hot air branch pipe to be repaired; removing the hot air valve at the connection between the hot air branch pipe to be repaired and the hot air main pipe side branch pipe, and installing a primary heat insulation blocking plate at the hot air main pipe side branch pipe; building a heat insulation wall at the position of the hot air branch pipe to be repaired close to the hot air outlet of the air mixing chamber; removing the primary heat insulation blocking plate, and installing a simulated hot air valve at the connection between the hot air branch pipe to be repaired and the hot air main pipe side branch pipe; removing the hot air branch pipe to be repaired, and installing a new hot air branch pipe; removing the simulated hot air valve, and installing a secondary heat insulation blocking plate at the hot air main pipe side branch pipe; removing the heat insulation wall and the secondary heat insulation blocking plate, and installing an official hot air valve at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe; such arrangement can repair the hot air branch pipe in a short time to meet the production conditions while maintaining the high temperature and stable state of the hot blast furnace, ensuring the safety of construction and shortening the construction period, thereby improving the construction efficiency of the hot blast furnace. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a flowchart of the hot air branch pipe online repair construction method of the hot blast furnace provided by the embodiment of the present application.

[0043] Figure 2 is a schematic diagram of the connection structure of the hot blast furnace and the hot air branch pipe in the hot air branch pipe online repair construction method of the hot blast furnace provided by the embodiment of the present application.

[0044] Figure 3 is a schematic diagram of the structure of the heat insulation blocking plate installed at the hot air main pipe side in the hot air branch pipe online repair construction method of the hot blast furnace provided by the embodiment of the present application. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below with reference to the accompanying drawings.

[0046] Reference Figure 1 and Figure 2The application discloses a hot blast furnace hot blast branch pipe online repair construction method, wherein the hot blast furnace comprises a regenerator, a combustion chamber and a mixed air chamber, the regenerator is communicated with the combustion chamber through a connecting pipe, and the combustion chamber is communicated with the mixed air chamber through a hot blast outlet connecting pipe.

[0047] An outer wall close to the bottom end of the mixed air chamber is provided with a mixed air chamber manhole, the mixed air chamber manhole is communicated with the inner cavity of the mixed air chamber, one end of the hot blast branch pipe to be repaired is communicated with the mixed air chamber, the other end of the hot blast branch pipe to be repaired is communicated with a hot blast main pipe side branch pipe through a hot blast valve, the hot blast branch pipe to be repaired is arranged opposite to the mixed air chamber manhole, and the mixed air chamber manhole is communicated with the hot blast branch pipe to be repaired through the inner cavity of the mixed air chamber.

[0048] When the hot blast furnace is in a working state, the mixed air chamber manhole is in a closed state.

[0049] The hot blast furnace hot blast branch pipe online repair construction method comprises the following steps.

[0050] S101, performing air cooling on the hot blast furnace connected with the hot blast branch pipe to be repaired;

[0051] S102, removing the hot blast valve at the connection position of the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe, and installing a primary heat insulation blocking plate at the hot blast main pipe side branch pipe;

[0052] S103, building a heat insulation wall at the position of the hot blast branch pipe to be repaired close to the hot blast outlet of the mixed air chamber;

[0053] S104, removing the primary heat insulation blocking plate and installing a simulated hot blast valve at the connection position of the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe;

[0054] S105, removing the hot blast branch pipe to be repaired and installing a new hot blast branch pipe;

[0055] S106, removing the simulated hot blast valve and installing a secondary heat insulation blocking plate at the hot blast main pipe side branch pipe;

[0056] S107, removing the heat insulation wall and the secondary heat insulation blocking plate and installing an official hot blast valve at the connection position of the new hot blast branch pipe and the hot blast main pipe side branch pipe; compared with a traditional hot blast furnace hot blast branch pipe repair method, the hot blast branch pipe can be repaired to reach the production condition in a short time, the high blast temperature for the blast furnace is continuously provided, the construction safety is ensured, the construction period is shortened, and the construction efficiency of the hot blast furnace is improved.

[0057] Before S101, performing air cooling on the hot blast furnace connected with the hot blast branch pipe to be repaired, the method further comprises the following steps.

[0058] According to the high-temperature abnormal area of the hot blast branch pipe to be repaired and the refractory construction drawing, the refractory repair range is determined; and according to the production requirements and the comprehensive situation of the abnormality of the hot blast branch pipe to be repaired, the hot blast furnace is repaired to ensure that three production and one rest are alternately repaired.

[0059] It should be noted that the comprehensive situation of the abnormality of the hot blast branch pipe to be repaired refers to the repair of the high-temperature abnormality of the hot blast branch pipe.

[0060] With reference to the foregoing description of the first embodiment, Figure 3 In this embodiment, S102, the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe is removed, and a one-time heat insulation plugging plate is installed at the hot blast main pipe side branch pipe, including:

[0061] S1021, opening the flue valve to form negative pressure in the air mixing chamber; in this way, the heat radiation in the air mixing chamber is avoided to cause damage to the construction personnel.

[0062] Specifically, after the flue valve is opened, the hot air in the air mixing chamber is extracted to the outside until the air mixing chamber forms negative pressure, and then the flue valve is closed.

[0063] S1022, removing the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe.

[0064] S1023, installing a one-time heat insulation plugging plate at the flange of the hot blast main pipe side branch pipe; in this way, the heat radiation generated in the hot blast main pipe is avoided to cause damage to the construction personnel.

[0065] With reference to the foregoing description of the first embodiment, Figure 2 In this embodiment, S103, a heat insulation wall is built at the position close to the hot blast outlet of the air mixing chamber of the hot blast branch pipe to be repaired, including:

[0066] S1031, opening the manhole of the air mixing chamber opposite to the hot blast branch pipe to be repaired, and building a pre-built wall by using a ceramic fiber blanket roll in one end of the hot blast branch pipe to be repaired close to the hot blast outlet of the air mixing chamber through the manhole of the air mixing chamber; by building the pre-built wall, conditions are created for building the heat insulation wall.

[0067] S1031, opening the manhole of the air mixing chamber opposite to the hot blast branch pipe to be repaired, and building a pre-built wall by using a ceramic fiber blanket roll in one end of the hot blast branch pipe to be repaired close to the hot blast outlet of the air mixing chamber through the manhole of the air mixing chamber; by building the pre-built wall, conditions are created for building the heat insulation wall.

[0068] S1031, opening the manhole of the air mixing chamber opposite to the hot blast branch pipe to be repaired;

[0069] S1032, clamping the ceramic fiber blanket roll by the installation clamp, and passing the end of the installation clamp provided with the ceramic fiber blanket roll through the manhole of the air mixing chamber into the hot blast branch pipe to be repaired;

[0070] S1033, place the ceramic fiber blanket roll in the hot air branch pipe to be repaired near one end of the hot air outlet of the air mixing chamber;

[0071] Repeat S1032-S1033 until the multiple ceramic fiber blanket rolls are built into a pre-built wall, and then close the manhole of the air mixing chamber.

[0072] S1032, forced cooling is performed on the hot air branch pipe to be repaired by using compressed air or water mist.

[0073] S1033, when the temperature in the hot air branch pipe to be repaired decreases to a preset temperature, the construction personnel enter the hot air branch pipe to be repaired, and build the wall body along the pre-built wall to form the heat insulation wall.

[0074] S1033, when the temperature in the hot air branch pipe to be repaired decreases to a preset temperature, the construction personnel enter the hot air branch pipe to be repaired, and build the wall body along the pre-built wall to form the heat insulation wall.

[0075] S10331, when the temperature in the hot air branch pipe to be repaired decreases to a preset temperature, the construction personnel enter the hot air branch pipe to be repaired, and build the wall body along the pre-built wall to form the heat insulation wall.

[0076] Specifically, the preset temperature range is 0-50°. That is, when the temperature in the hot air branch pipe to be repaired decreases to 50° or below, the construction personnel enter the hot air branch pipe to be repaired, and build the wall body along the pre-built wall to form the heat insulation wall.

[0077] S10332, the heat insulation wall is reinforced by a steel structure at the outermost side of the heat insulation wall.

[0078] In this embodiment, S105, the hot air branch pipe to be repaired is removed, and a new hot air branch pipe is installed, including:

[0079] S1051, enter the hot air branch pipe to be repaired through the manhole on the simulated hot air valve, and remove the pipeline bricks and sprayed materials that need to be removed;

[0080] S1052, after the pipeline bricks and sprayed materials are removed, the steel structure of the hot air branch pipe to be repaired is cut off, and a new hot air branch pipe is installed;

[0081] S1053, enter the new hot air branch pipe through the manhole on the simulated hot air valve, and spray the refractory bricks in the new hot air branch pipe.

[0082] In this embodiment, S107, the heat insulation wall and the secondary heat insulation plugging plate are removed, and a formal hot air valve is installed at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe, including:

[0083] S1071, open the flue valve to form negative pressure in the mixing chamber, and remove the heat insulation wall.

[0084] Specifically, after opening the flue valve, hot gas in the mixing chamber is extracted to the outside until the mixing chamber forms negative pressure, and then the flue valve is closed. Then the construction personnel enters the new hot air branch pipe to remove the heat insulation wall.

[0085] S1072, after the new hot air branch pipe is cleaned, the secondary heat insulation blocking plate is removed, and the formal hot air valve is installed at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe.

[0086] In the embodiment, after S107, the heat insulation wall and the secondary heat insulation blocking plate are removed, and the formal hot air valve is installed at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe, the method further includes: restarting the hot blast stove and producing.

[0087] The hot blast stove hot air branch pipe online repair construction method provided by the application includes the following steps: stopping the hot blast stove connected with the hot air branch pipe to be repaired; removing the hot air valve at the connection between the hot air branch pipe to be repaired and the hot air main pipe side branch pipe, and installing a primary heat insulation blocking plate at the hot air main pipe side branch pipe; building a heat insulation wall at the position of the hot air branch pipe to be repaired close to the hot air outlet of the mixing chamber; removing the primary heat insulation blocking plate, and installing a simulated hot air valve at the connection between the hot air branch pipe to be repaired and the hot air main pipe side branch pipe; removing the hot air branch pipe to be repaired, and installing a new hot air branch pipe; removing the simulated hot air valve, and installing a secondary heat insulation blocking plate at the hot air main pipe side branch pipe; removing the heat insulation wall and the secondary heat insulation blocking plate, and installing a formal hot air valve at the connection between the new hot air branch pipe and the hot air main pipe side branch pipe; in this way, compared with the traditional hot blast stove hot air branch pipe repair method, the hot air branch pipe can be repaired to reach the production condition in a short time while maintaining the high temperature and stable state of the hot blast stove, the construction period is shortened while ensuring the construction safety, and the construction efficiency of the hot blast stove is improved.

[0088] It should be noted that, in this text, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0089] It should be pointed out finally that the above embodiments are merely examples for clearly illustrating the present application and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. It is unnecessary and impossible to enumerate all the embodiments. The changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A hot blast stove hot blast branch pipe online repair construction method, characterized in that: The method comprises the following steps: a hot blast stove connected with a hot blast branch pipe to be repaired is blown down; a hot blast valve at a connection between the hot blast branch pipe to be repaired and a hot blast main pipe side branch pipe is removed, and a primary heat insulation blocking plate is installed at the hot blast main pipe side branch pipe; a heat insulation wall is built at a position of the hot blast branch pipe to be repaired close to a hot blast outlet of a mixing chamber; the primary heat insulation blocking plate is removed, and a simulated hot blast valve is installed at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe; the hot blast branch pipe to be repaired is removed, and a new hot blast branch pipe is installed; the simulated hot blast valve is removed, and a secondary heat insulation blocking plate is installed at the hot blast main pipe side branch pipe; the heat insulation wall and the secondary heat insulation blocking plate are removed, and an official hot blast valve is installed at a connection between the new hot blast branch pipe and the hot blast main pipe side branch pipe.

2. The method according to claim 1, wherein: The step of removing the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe, and installing the primary heat insulation blocking plate at the hot blast main pipe side branch pipe comprises the following steps: a flue valve is opened to form negative pressure in the mixing chamber; the hot blast valve at the connection between the hot blast branch pipe to be repaired and the hot blast main pipe side branch pipe is removed; the primary heat insulation blocking plate is installed at a flange of the hot blast main pipe side branch pipe.

3. The method according to claim 1, wherein the method is characterized by: The step of building the heat insulation wall at the position of the hot blast branch pipe to be repaired close to the hot blast outlet of the mixing chamber comprises the following steps: a manhole of the mixing chamber opposite to the hot blast branch pipe to be repaired is opened, a pre-built wall is built in one end of the hot blast branch pipe to be repaired close to the hot blast outlet of the mixing chamber by using a ceramic fiber blanket roll through the manhole of the mixing chamber; compressed air or water mist is used to forcibly cool the hot blast branch pipe to be repaired; when the temperature in the hot blast branch pipe to be repaired reaches a preset temperature, a worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by abutting against the pre-built wall.

4. The method according to claim 3, wherein the method is characterized by: When the temperature in the hot blast branch pipe to be repaired reaches the preset temperature, the worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by abutting against the pre-built wall, which comprises the following steps: When the temperature in the hot blast branch pipe to be repaired reaches the preset temperature, the worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by abutting against the pre-built wall, which comprises the following steps: When the temperature in the hot blast branch pipe to be repaired reaches the preset temperature, the worker enters the hot blast branch pipe to be repaired, and builds a wall body to form the heat insulation wall by abutting against the pre-built wall, which comprises the following steps:

5. The method according to claim 4, wherein the method is characterized by: steel structures are used to reinforce the heat insulation wall at the outermost side of the heat insulation wall.

6. The method according to claim 1, wherein: The preset temperature ranges from 0 to 50 degrees. The step of removing the hot blast branch pipe to be repaired, and installing the new hot blast branch pipe comprises the following steps: the worker enters the hot blast branch pipe to be repaired through a manhole of the simulated hot blast valve, and removes pipeline bricks and sprayed materials; after the pipeline bricks and the sprayed materials are removed, the steel structure of the hot blast branch pipe to be repaired is cut off, and the new hot blast branch pipe is installed; 7. The method according to claim 1, wherein the method is characterized by: the worker enters the new hot blast branch pipe through the manhole of the simulated hot blast valve, and sprays refractory bricks in the new hot blast branch pipe. The step of removing the heat insulation wall and the secondary heat insulation blocking plate, and installing the official hot blast valve at the connection between the new hot blast branch pipe and the hot blast main pipe side branch pipe comprises the following steps: the flue valve is opened to form negative pressure in the mixing chamber, and the heat insulation wall is removed at the same time; after the new hot blast branch pipe is cleaned, the secondary heat insulation blocking plate is removed, and the official hot blast valve is installed at the connection between the new hot blast branch pipe and the hot blast main pipe side branch pipe.

8. The method according to claim 1, wherein the method is characterized by: Before the hot blast stove connected with the hot blast branch pipe to be repaired is blown down, the method further comprises: determining the refractory repair range according to the high-temperature abnormal area of the hot blast branch pipe to be repaired and the refractory construction drawing; determining the maintenance hot blast stove according to the production requirements and the abnormal comprehensive situation of the hot blast branch pipe to be repaired, and ensuring that three production hot blast stoves are repaired in turn.

9. The method according to claim 1, wherein the method is characterized by: After the heat insulation wall and the secondary heat insulation blocking plate are removed, and the formal hot blast valve is installed at the connection between the new hot blast branch pipe and the hot blast main pipe side branch pipe, the method further comprises: restoring the blown-down hot blast stove to production.

10. The method according to claim 3, wherein the method is characterized by: opening the mixing chamber manhole opposite to the hot blast branch pipe to be repaired, and building a pre-built wall by using ceramic fiber blanket rolls in the end of the hot blast branch pipe to be repaired close to the hot blast outlet of the mixing chamber through the mixing chamber manhole, comprising: S1031, opening the mixing chamber manhole opposite to the hot blast branch pipe to be repaired; S1032, clamping the ceramic fiber blanket roll by using the installation clamp, and passing the end of the installation clamp provided with the ceramic fiber blanket roll through the mixing chamber manhole into the hot blast branch pipe to be repaired; S1033, placing the ceramic fiber blanket roll in the end of the hot blast branch pipe to be repaired close to the hot blast outlet of the mixing chamber; repeating S1032-S1033 until the multiple ceramic fiber blanket rolls are built into a pre-built wall, and then closing the mixing chamber manhole.

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