Reverse air supply system of hot blast stove after overhaul of blast furnace

Abstract

The reverse air supply system comprises a hot blast stove body, the lower end of the hot blast stove body is connected with a cold air branch pipe, the cold air branch pipe is connected with a first pressurizing pipeline and a second pressurizing pipeline, the first pressurizing pipeline and the second pressurizing pipeline are both communicated with a cold air main pipe, and valve bodies are arranged on the first stamping pipeline and the second stamping pipeline; the cold air branch pipe is communicated with a reverse air supply pipeline through an upwind branch pipe, the outer end of the reverse air supply pipeline is connected with a combustion fan, and a valve I is arranged on the upwind branch pipe; a hot air pipeline is arranged on the upper portion of the hot air furnace body and communicated with the hot air furnace body through a hot air branch pipe, and a hot air valve is arranged on the hot air branch pipe. One end of the hot air pipeline is communicated with the hot air bustle pipe; the other end of the hot air pipeline is communicated with the outside; the reverse air supply system is simple in structure, the temperature of the grate of the blast furnace can be controlled to be lower than 400 DEG C through the reverse air supply system, meanwhile, the temperature of a vault is prevented from being conducted downwards, and it is guaranteed that the temperature of the vault is not lower than 850 DEG C.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply systems, in particular to a reverse air supply system for a hot blast furnace after a blast furnace overhaul. Background Art

[0002] During the shutdown period of the blast furnace for maintenance, the hot blast furnace system is insulated. After a certain period of time, the high temperature area moves down. The hot blast furnace has different heights and brick types. It is not possible to avoid that the heat cannot be released in time after long-term burning. The temperature of the arch drops below 850℃, affecting the working state of the arch. In addition, the temperature of the arch gathers on the lower grate, causing the grate temperature to rise to more than 400℃, which will affect the life of the grate. It also affects the wind temperature level of the hot blast furnace. In order to solve the above problems, a reverse air supply system for the hot blast furnace after blast furnace overhaul is proposed. Summary of the invention

[0003] The utility model aims to solve the above problems and provides a reverse air supply system for a hot blast stove after a blast furnace overhaul.

[0004] The specific scheme of the utility model is: a reverse air supply system for a hot blast furnace after blast furnace overhaul, comprising: a hot blast furnace body, a cold air branch pipe connected to the lower end of the hot blast furnace body, the cold air branch pipe is connected to a pressurizing pipe one and a pressurizing pipe two, the pressurizing pipe one and the pressurizing pipe two are both connected to the cold air main pipe, and valve bodies are provided on the stamping pipe one and the stamping pipe two; the cold air branch pipe is connected to the reverse air supply pipe through the reverse air branch pipe, the outer end of the reverse air supply pipe is connected to a combustion-supporting fan, and a valve one is provided on the reverse air branch pipe; a hot air duct is provided on the upper part of the hot blast furnace body, the hot air duct is connected to the hot blast furnace body through the hot air branch pipe, and a hot air valve is provided on the hot air branch pipe; one end of the hot air duct is connected to the hot air surrounding pipe, and a plurality of surrounding pipe branches are provided on the hot air surrounding pipe, and the surrounding pipe branches are used to provide heat to the blast furnace; a valve two is provided at the other end of the hot air duct, and the valve two is used to control whether the hot air duct is connected to the outside world.

[0005] Furthermore, a pressure charging valve is provided on the pressure charging pipe one, a cold air valve is provided on the pressure charging pipe two, and the cold air main pipe is connected to an external fan.

[0006] Furthermore, there are three hot blast furnace bodies.

[0007] Furthermore, the second valve provided on the hot air duct is a backflow air shut-off valve, and the backflow air shut-off valve is used to control whether the hot air duct is connected to the outside.

[0008] Furthermore, the valve arranged on the reverse wind branch pipe is a reverse air supply electric valve.

[0009] Furthermore, a buffer chamber is provided between the hot air duct and the hot air surrounding pipe.

[0010] The working principle of the utility model is as follows: after the blast furnace is shut down, in order to prevent the high temperature of the arch from being conducted downward, resulting in the arch temperature being lower than 850°C, while the grate temperature is higher than 400°C, the reverse air supply system of the utility model is used to turn on the combustion-supporting fan to provide wind pressure to the bottom of the hot blast stove body, thereby controlling the temperature of the grate of the blast furnace to be lower than 400°C, while preventing the arch temperature from being conducted downward, ensuring that the arch temperature is not lower than 850°C, thereby not affecting the blast furnace or the working state of the blast furnace during overhaul.

[0011] The utility model has the following beneficial effects:

[0012] The utility model has a simple structure and a low manufacturing cost. Through the reverse air supply system of the utility model, the temperature of the grate of the blast furnace can be controlled to be lower than 400°C, while preventing the temperature of the arch from being conducted downward, thereby ensuring that the temperature of the arch is not lower than 850°C. Therefore, the blast furnace is not affected, and the working state of the blast furnace during overhaul is not affected. That is, the service life of the blast furnace is increased while the working state of the blast furnace is maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the working principle of the utility model;

[0014] In the figure: 1. Hot air furnace body; 2. Cold air branch pipe; 3. Pressurized pipe one; 4. Pressurized pipe two; 5. Cold air main pipe; 6. Reverse air supply pipe; 7. Combustion-supporting fan; 8. Hot air pipe; 9. Hot air branch pipe; 10. Hot air surrounding pipe; 11. Pressurized valve; 12. Cold air valve; 13. Reverse air supply electric valve; 14. Backflow air shut-off valve; 15. Hot air valve; 16. Reverse air branch pipe; 17. Buffer chamber; 18. Surrounding pipe branch pipe. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0017] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0018] Please refer to Figure 1 A reverse air supply system for a hot blast furnace after overhaul, comprising: a hot blast furnace body 1, a cold air branch pipe 2 connected to the lower end of the hot blast furnace body 1, the cold air branch pipe 2 connected to a pressurized pipe 1 3 and a pressurized pipe 2 4, the pressurized pipe 1 3 and the pressurized pipe 2 4 are both connected to a cold air main pipe 5, the pressurized pipe 1 and the pressurized pipe 2 are both provided with a valve body; the cold air branch pipe 2 is connected to a reverse air supply pipe 6 through a reverse air branch pipe 16, the outer end of the reverse air supply pipe 6 is connected to a combustion-supporting fan 7, the reverse air branch A valve 1 is provided on the tube 16; a hot air duct 8 is provided on the upper part of the hot blast furnace body 1, and the hot air duct 8 is connected with the hot blast furnace body 1 through a hot air branch pipe 9, and a hot air valve 15 is provided on the hot air branch pipe 9; one end of the hot air duct 8 is connected with a hot air surrounding pipe 10, and a plurality of surrounding pipe branches 18 are provided on the hot air surrounding pipe 10, and the surrounding pipe branches 18 are used to provide heat to the blast furnace; a valve 2 is provided at the other end of the hot air duct 8, and the valve 2 is used to control whether the hot air duct 8 is connected with the outside world.

[0019] Furthermore, a pressure charging valve 11 is provided on the pressure charging pipe 1 3 , a cold air valve 12 is provided on the pressure charging pipe 2 4 , and the cold air main pipe 5 is connected to an external fan.

[0020] Furthermore, there are three hot blast stove bodies 1.

[0021] Furthermore, the second valve provided on the hot air duct 8 is a backflow air stop valve 14, and the backflow air stop valve 14 is used to control whether the hot air duct 8 is connected to the outside.

[0022] Furthermore, the valve disposed on the reverse wind branch pipe 16 is a reverse air supply electric valve 13 .

[0023] Furthermore, a buffer chamber 17 is provided between the hot air duct 8 and the hot air surrounding pipe 10 .

[0024] The working principle of the utility model: after the blast furnace is shut down, in order to prevent the high temperature of the dome from being conducted downward, causing the dome temperature to be lower than 850°C and the grate temperature to be higher than 400°C, the reverse air supply system of the utility model is used to turn on the combustion-supporting fan 7 to provide wind pressure to the bottom of the hot blast furnace body 1, thereby controlling the temperature of the grate of the blast furnace to be lower than 400°C and preventing the dome temperature from being conducted downward, ensuring that the dome temperature is not lower than 850°C, thereby not affecting the blast furnace and the working state of the blast furnace during overhaul. The utility model has the following beneficial effects:

[0025] The utility model has a simple structure and a low manufacturing cost. Through the reverse air supply system of the utility model, the temperature of the grate of the blast furnace can be controlled to be lower than 400°C, while preventing the temperature of the arch from being conducted downward, thereby ensuring that the temperature of the arch is not lower than 850°C. Therefore, the blast furnace is not affected, and the working state of the blast furnace during overhaul is not affected. That is, the service life of the blast furnace is increased while the working state of the blast furnace is maintained.

Claims

1. A hot blast stove reverse air supply system after blast furnace overhaul, comprising: The hot blast furnace body is characterized in that: a cold air branch pipe is connected to the lower end of the hot blast furnace body, and the cold air branch pipe is connected to a pressurizing pipe one and a pressurizing pipe two, and the pressurizing pipe one and the pressurizing pipe two are both connected to the cold air main pipe, and valve bodies are provided on the pressurizing pipe one and the pressing pipe two; the cold air branch pipe is connected to the reverse air supply pipe through a reverse air branch pipe, and the outer end of the reverse air supply pipe is connected to a combustion-supporting fan, and a valve one is provided on the reverse air branch pipe; a hot air duct is provided on the upper part of the hot blast furnace body, and the hot air duct is connected to the hot blast furnace body through a hot air branch pipe, and a hot air valve is provided on the hot air branch pipe; one end of the hot air duct is connected to the hot air surrounding pipe, and a plurality of surrounding pipe branches are provided on the hot air surrounding pipe, and the surrounding pipe branches are used to provide heat to the blast furnace; a valve two is provided at the other end of the hot air duct, and the valve two is used to control whether the hot air duct is connected to the outside world.

2. The reverse air supply system for hot blast stove after blast furnace overhaul according to claim 1 is characterized in that: The first pressure charging pipe is provided with a pressure charging valve, the second pressure charging pipe is provided with a cold air valve, and the cold air main pipe is connected to an external fan.

3. The reverse air supply system for hot blast stove after blast furnace overhaul according to claim 1 is characterized by: The number of the hot blast stove bodies is three.

4. The reverse air supply system for hot blast stove after blast furnace overhaul according to claim 1 is characterized in that: The second valve arranged on the hot air duct is a backflow air shut-off valve, and the backflow air shut-off valve is used to control whether the hot air duct is connected to the outside.

5. The reverse air supply system for hot blast stove after blast furnace overhaul according to claim 1 is characterized by: The first valve arranged on the reverse wind branch pipe is a reverse air supply electric valve.

6. The reverse air supply system for hot blast stove after blast furnace overhaul according to claim 1 is characterized by: A buffer chamber is provided between the hot air duct and the hot air surrounding pipe.

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