Negative pressure adjusting device of blast furnace hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, and provides a blast furnace hot blast stove negative pressure adjusting device which comprises a chimney, a smoke exhaust fan, a main pipeline and at least three hot blast stoves, the smoke exhaust fan is arranged between the main pipeline and the chimney and used for pumping smoke in the main pipeline into the chimney, and branch pipelines are arranged between the main pipeline and the hot blast stoves; a smoke exhaust valve, a flue gate plate and a first pressure gauge are arranged on the branch pipeline, and the flue gate plate is located between the smoke exhaust valve and the first pressure gauge. The method is applied to control over the furnace pressure of the vertically-crossed pre-mixing top combustion type hot-blast stove, during use, at least two hot-blast stoves conduct combustion, the other hot-blast stoves supply air, the smoke exhaust valves on the branch pipelines corresponding to the hot-blast stoves in the combustion state are opened, the smoke exhaust fan is used for conducting smoke exhaust on the main pipeline, and the first pressure gauge detects the internal smoke pressure of the branch pipelines; according to different readings of the first pressure gauge, the opening degree of the flue gate plate is changed, so that the pressure of a combustion area is accurately adjusted, and the combustion requirements under different working conditions are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot blast stove, in particular to a blast furnace hot blast stove negative pressure adjusting device. BACKGROUND

[0002] The hot blast stove is the main equipment for providing hot blast in the blast furnace ironmaking, and the heat provided by the hot blast stove accounts for about 1 / 4 of the heat consumption in the blast furnace ironmaking, and the blast furnace gas consumed by the hot blast stove accounts for about 1 / 3 of the blast furnace gas produced, so the hot blast stove plays a crucial role in the blast furnace ironmaking.

[0003] Generally, 3-4 vertical cross premixing top combustion type hot blast stoves are arranged to form a hot blast stove group, and a mother pipe is used for exhaust gas, after the hot blast stove group is modified for desulfurization and denitrification, the exhaust gas mode is changed from "chimney exhaust gas" to "forced exhaust gas by fan", however, in actual operation, due to different combustion states of different hot blast stoves, the consumed blast furnace gas and the generated flue gas are also different, and the forced exhaust gas by mother pipe will cause the same negative pressure of each hot blast stove, and the negative pressure of the hot blast stove in the initial combustion stage is too large, the air and gas flow intensity is low, and the mixed gas flow is not fully combusted and is discharged through the heat storage body, which causes energy waste and safety hazards. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiment of the present application is to provide a blast furnace hot blast stove negative pressure adjusting device, which is applied to the control of the pressure of the vertical cross premixing top combustion type hot blast stove, can adjust the pressure and flow of the hot blast stove, and meets the combustion requirements under different working conditions.

[0005] The embodiment of the present application provides a blast furnace hot blast stove negative pressure adjusting device, which adopts the following technical scheme:

[0006] A blast furnace hot blast stove negative pressure adjusting device, comprising a chimney, an exhaust gas fan, a main pipeline and at least three hot blast stoves, the exhaust gas fan is arranged between the main pipeline and the chimney, the exhaust gas fan is used for drawing the flue gas in the main pipeline to the chimney, a branch pipeline is arranged between the main pipeline and the hot blast stove, an exhaust gas valve, a flue damper and a first pressure gauge are arranged on the branch pipeline, the flue damper is located between the exhaust gas valve and the first pressure gauge, and the first pressure gauge is located between the flue damper and the main pipeline.

[0007] Preferably, a desulfurization and denitrification device is arranged on the main pipeline.

[0008] Preferably, a burner platform is arranged in the hot blast stove, a plurality of groups of burners are arranged on the burner platform, the plurality of groups of burners are arranged in a ring array, the burner comprises a gas nozzle, an air nozzle and an S-shaped baffle, and the S-shaped baffle is located between the gas nozzle and the air nozzle.

[0009] Preferably, the hot blast stove is provided with a second pressure gauge.

[0010] Preferably, the smoke exhaust valve is an electric smoke exhaust valve.

[0011] Preferably, the smoke damper is an electric smoke damper.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] The application is applied to the control of the pressure of a vertical cross pre-mixed top combustion hot blast stove. When in use, at least two hot blast stoves are combusted, and the rest of the hot blast stoves are supplied with air. The smoke exhaust valve on the branch pipeline corresponding to the hot blast stove in the combustion state is opened, and the main pipeline is exhausted by the smoke exhaust fan. In the smoke exhaust process, the first pressure gauge detects the smoke pressure in the branch pipeline. According to the different readings of the first pressure gauge, the opening degree of the smoke damper is changed, so that the pressure of the combustion area is accurately adjusted to meet the combustion requirements under different working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0015] Figure 1 It is a structural schematic view of the application;

[0016] Figure 2 It is a top view of the hot blast stove burner in the application;

[0017] Figure 3 It is a structural schematic view of a single group of burners in the application. Figure 2

[0018] The reference signs are respectively:

[0019] 1, chimney; 2, smoke exhaust fan; 3, main pipeline; 4, hot blast stove; 5, branch pipeline; 6, smoke exhaust valve; 7, smoke damper; 8, first pressure gauge; 9, desulfurization and denitrification device; 10, burner platform; 11, burner; 12, coal gas nozzle; 13, air nozzle; 14, S-shaped partition; 15, second pressure gauge; 16, air pipeline; 17, coal gas pipeline. DETAILED DESCRIPTION

[0020] ​To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Example

[0027] likeFigures 1-3 As shown in the embodiment of this application, the blast furnace hot blast stove negative pressure regulating device includes a chimney 1, a flue gas fan 2, a main pipe 3, and at least three hot blast stoves 4. The flue gas fan 2 is installed between the main pipe 3 and the chimney 1. The flue gas fan 2 is used to draw the flue gas inside the main pipe 3 into the chimney 1. A branch pipe 5 is installed between the main pipe 3 and the hot blast stove 4. A flue gas valve 6, a flue damper 7, and a first pressure gauge 8 are installed on the branch pipe 5. The flue damper 7 is located between the flue gas valve 6 and the first pressure gauge 8. The first pressure gauge 8 is located between the flue damper 7 and the main pipe 3.

[0028] In use, at least two hot air furnaces 4 are burning, while the remaining hot air furnaces 4 supply air. The exhaust valve 6 on the branch pipe 5 corresponding to the hot air furnace 4 in the burning state is opened, and the exhaust fan 2 is used to exhaust smoke from the main pipe 3. During the exhaust process, the first pressure gauge 8 detects the flue gas pressure inside the branch pipe 5. According to the different readings of the first pressure gauge 8, the opening degree of the flue damper 7 on the corresponding branch pipe 5 is changed, thereby achieving precise adjustment of the pressure in the combustion area to meet the combustion requirements under different working conditions. The exhaust fan draws the flue gas to the chimney 1, and the flue gas is discharged through the chimney 1.

[0029] In this embodiment, a desulfurization and denitrification device 9 is installed on the main pipeline 3. The desulfurization and denitrification device 9 performs desulfurization and denitrification treatment on the flue gas to improve environmental protection benefits.

[0030] In this embodiment, a burner platform 10 is provided inside the hot air furnace 4. Several sets of burners 11 are provided on the burner platform 10. The several sets of burners 11 are arranged in a ring array. Each burner 11 includes a gas nozzle 12, an air nozzle 13, and an S-shaped baffle 14. The S-shaped baffle 14 is located between the gas nozzle 12 and the air nozzle 13. The arrangement of the S-shaped baffle 14 can change the blowing direction of the gas and air, which helps to distribute the gas more evenly and reduce the problems of local overheating or incomplete combustion.

[0031] In this embodiment, a second pressure gauge 15 is provided on the hot blast stove 4, which is used to detect the furnace pressure of the hot blast stove 4.

[0032] In this embodiment, the smoke exhaust valve 6 is an electric smoke exhaust valve, which realizes automatic control without human intervention.

[0033] In this embodiment, the flue damper 7 is an electric flue damper, which realizes automatic control without human intervention.

[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A negative pressure regulating device for a blast furnace hot blast stove, characterized in that: The system includes a chimney, an exhaust fan, a main duct, and at least three hot air furnaces. The exhaust fan is located between the main duct and the chimney and is used to draw flue gas from inside the main duct into the chimney. A branch duct is provided between the main duct and the hot air furnaces. The branch duct is equipped with an exhaust valve, a flue damper, and a first pressure gauge. The flue damper is located between the exhaust valve and the first pressure gauge, and the first pressure gauge is located between the flue damper and the main duct.

2. The negative pressure regulating device for a blast furnace hot blast stove according to claim 1, characterized in that: The main pipeline is equipped with a desulfurization and denitrification device.

3. The negative pressure regulating device for a blast furnace hot blast stove according to claim 1, characterized in that: The hot air furnace is equipped with a burner platform inside, and several sets of burners are arranged on the burner platform in a ring array. Each burner includes a gas nozzle, an air nozzle, and an S-shaped baffle, with the S-shaped baffle located between the gas nozzle and the air nozzle.

4. The negative pressure regulating device for a blast furnace hot blast stove according to claim 1, characterized in that: A second pressure gauge is installed on the hot air furnace.

5. The negative pressure regulating device for a blast furnace hot blast stove according to claim 1, characterized in that: The smoke exhaust valve is an electric smoke exhaust valve.

6. The negative pressure regulating device for a blast furnace hot blast stove according to claim 1, characterized in that: The flue damper is an electric flue damper.

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