Blast furnace muffling structure

Abstract

The utility model discloses a blast furnace structure of smothering, including blast furnace and high pressure nitrogen gas main, the upper portion of blast furnace is equipped with the furnace throat nitrogen gas hole, and the middle part is equipped with the nodular detection hole, and the lower part is equipped with the lance, one end of high pressure nitrogen gas main is high pressure nitrogen gas entrance, and the other end of high pressure nitrogen gas main is connected distribution pipe, and the export of distribution pipe realizes pipeline connection with furnace throat nitrogen gas hole, nodular detection hole respectively again, the pipe wall of high pressure nitrogen gas main still is connected with the branch pipe, and the branch pipe is connected with a blast furnace distributor again, and the export of blast furnace distributor realizes pipeline connection with the inlet of lance again, and the top of blast furnace is connected with the gas sampling tube, and the gas sampling tube is connected with carbon monoxide testing arrangement again, the utility model discloses utilize furnace throat nitrogen gas hole, nodular detection hole and the lance together and pass into nitrogen gas to the furnace, is favorable to the quick stop of the combustion reaction in the furnace, and through the real -time detection and initiative control to the combustion in the furnace, to ensure the combustion in the furnace to stop, guarantee smothering material's integrity.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking equipment, and in particular to a blast furnace shut-off structure. Background Technology

[0002] To minimize the cost of resuming production, companies commonly employ a "charging and shutting down" process: when shutting down the furnace, the burden is not emptied, but rather a portion of coke and ore is retained in order to shorten the subsequent furnace drying and ignition cycle. However, this process requires extremely high levels of airtightness within the furnace. Even the slightest air infiltration will cause the remaining coke to continue smoldering until it is completely burned off, resulting not only in coke waste but also the need for additional coke replenishment and furnace re-drying, thus prolonging the resumption time and increasing costs.

[0003] Current furnace sealing measures remain at a rudimentary level, relying on "covering the material surface with slag / ore and lining the tuyeres with bricks and applying grease." This approach fails to reliably isolate the coke from the air, resulting in slow burn-off of the coke inside the furnace. Therefore, the industry urgently needs a furnace sealing technology and supporting structure that can actively control the combustion state inside the furnace to ensure that coke completely stops burning during long-term shutdowns, thereby truly achieving the goals of "low cost, zero burn-off, and immediate resumption of production." Utility Model Content

[0004] The purpose of this utility model is to provide a blast furnace shut-off structure.

[0005] The technical solution to achieve the purpose of this utility model is: a blast furnace shut-off structure, including a blast furnace and a high-pressure nitrogen main pipe; the upper part of the blast furnace is provided with a throat nitrogen hole, the middle part with a nodule detection hole, and the lower part with a spray gun; one end of the high-pressure nitrogen main pipe is a high-pressure nitrogen inlet, and the other end of the high-pressure nitrogen main pipe is connected to a distribution pipe, the outlet of the distribution pipe is then connected to the throat nitrogen hole and the nodule detection hole respectively; a branch pipe is also connected to the wall of the high-pressure nitrogen main pipe, the branch pipe is then connected to a blast furnace distributor, and the outlet of the blast furnace distributor is then connected to the inlet of the spray gun; a gas sampling pipe is connected to the top of the blast furnace, and the gas sampling pipe is then connected to a carbon monoxide testing device.

[0006] This invention utilizes nitrogen vents in the furnace throat, nodule detection vents, and spray guns to introduce nitrogen into the furnace, which helps to quickly stop the combustion reaction inside the furnace. Furthermore, it uses a gas sampling pipe and carbon monoxide testing device on the top of the blast furnace to detect the carbon monoxide (CO) content inside the furnace. When the CO content drops to 0, it proves that combustion inside the furnace has completely stopped. This allows for real-time detection and active control of the combustion situation inside the furnace, thereby ensuring that combustion stops and guaranteeing the integrity of the furnace charge.

[0007] Furthermore, an ascending pipe for drawing gas from the top of the blast furnace is connected above the furnace top, and the gas sampling pipe is located near the furnace top of the ascending pipe and is connected to the furnace top through the ascending pipe.

[0008] Introducing high-pressure nitrogen will increase the pressure inside the furnace. To prevent the pressure at the furnace top from exceeding its design pressure, a pressure detector is installed at the top of the blast furnace. An electrically controlled regulating valve is installed near the inlet end of the high-pressure nitrogen main pipe, and this valve is electrically connected to the pressure detector. The pressure detector monitors the furnace pressure in real time and, in conjunction with the electrically controlled regulating valve, controls the amount of high-pressure nitrogen introduced, thereby preventing the furnace top pressure from exceeding its design pressure.

[0009] Furthermore, there are multiple spray guns, which are evenly distributed along the circumference of the blast furnace; the blast furnace distributor has multiple outlets, and each outlet is connected to a spray gun in a one-to-one correspondence.

[0010] Furthermore, there are three nodule detection holes, which are arranged at intervals along the height direction of the blast furnace; the outlet of the distribution pipe is set in a one-to-one correspondence with the nodule detection holes.

[0011] Furthermore, a gas valve is provided on the high-pressure nitrogen main pipe between the branch pipe and the distribution pipe. When the gas valve is open, the high-pressure nitrogen in the high-pressure nitrogen main pipe can reach the furnace throat nitrogen hole and the nodule detection hole through the distribution pipe and then enter the furnace. When the gas valve is closed, the supply of high-pressure nitrogen to the furnace throat nitrogen hole and the nodule detection hole is stopped.

[0012] Furthermore, the spray gun is a conventional blast furnace pulverized coal spray gun. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the blast furnace shut-down structure described in an embodiment of the present invention. Detailed Implementation

[0014] The preferred embodiment of the blast furnace shut-off structure of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] like Figure 1As shown, a blast furnace shut-down structure includes a blast furnace 10 and a high-pressure nitrogen main pipe 20; the upper part of the blast furnace 10 is provided with a throat nitrogen port 11, the middle part with a nodule detection port 12, and the lower part with a spray gun 13; one end of the high-pressure nitrogen main pipe 20 is a high-pressure nitrogen inlet 21, and the other end of the high-pressure nitrogen main pipe 20 is connected to a distribution pipe 30, the outlet of the distribution pipe 30 is then connected to the throat nitrogen port 11 and the nodule detection port 12 respectively; the high-pressure nitrogen main pipe 20... A branch pipe 40 is connected to the wall of the blast furnace 10, and the branch pipe 40 is connected to a blast furnace distributor 50. The outlet of the blast furnace distributor 50 is then connected to the inlet of the injection lance. A gas sampling pipe 70 is connected to the top of the blast furnace 10, and the gas sampling pipe 70 is connected to a carbon monoxide testing device 80. The nitrogen port 11 in the furnace throat, the nodule detection port 12, and the injection lance 13 of the blast furnace 10 are all conventional blast furnace structures, and the injection lance 13 is a conventional blast furnace pulverized coal injection lance. In this embodiment of the present invention, the original pulverized coal injection lance of the blast furnace is used as a device for injecting nitrogen.

[0016] This invention utilizes the nitrogen vent 11 in the furnace throat, the nodule detection vent 12, and the spray gun 13 to introduce nitrogen into the furnace, which helps to quickly stop the combustion reaction inside the furnace. The CO content inside the furnace is detected by the gas sampling pipe 70 and the carbon monoxide testing device 80 at the top of the blast furnace. When the CO content drops to 0, it proves that combustion inside the furnace has completely stopped. This enables real-time detection and active control of the combustion situation inside the furnace, thereby ensuring that combustion inside the furnace stops and guaranteeing the integrity of the furnace charge.

[0017] Furthermore, such as Figure 1 As shown, a riser pipe 90 for drawing gas upwards from the top of the blast furnace is connected above the furnace top. The gas sampling pipe 70 is located near the top of the riser pipe 90 and is connected to the top of the blast furnace 10 through the riser pipe 90. Of course, the gas sampling pipe 70 can be, but is not limited to, located on the riser pipe 90; it can be located at any position on the top of the furnace along the gas emission path.

[0018] Introducing high-pressure nitrogen will increase the pressure inside the furnace. To prevent the pressure at the furnace top from exceeding its design pressure, a pressure detector 100 is installed at the top of the blast furnace 10. An electric regulating valve 110 is installed near the inlet 21 of the high-pressure nitrogen main pipe 20, and the electric regulating valve 110 is electrically connected to the pressure detector 100. The pressure detector monitors the pressure inside the furnace in real time and, in conjunction with the electric regulating valve, controls the intake of high-pressure nitrogen, thereby preventing the pressure at the furnace top from exceeding its design pressure. In specific implementation, the pressure detector 100 is also installed near the furnace top of the riser pipe 90. Of course, the installation position of the pressure detector 100 can be, but is not limited to, near the furnace top of the riser pipe 90; it can be installed at any position on the furnace top.

[0019] Furthermore, there are multiple spray guns, evenly distributed along the circumference of the blast furnace 10; the blast furnace distributor 50 has multiple outlets, and each outlet is connected to a spray gun in a one-to-one correspondence (e.g., Figure 1 (As shown). Since the spray gun 13 and its distribution structure both adopt the conventional structure of blast furnace pulverized coal injection guns, they will not be described in detail.

[0020] Furthermore, such as Figure 1 As shown, there are three nodule detection holes 12, which are arranged at intervals along the height direction of the blast furnace 10; the outlet of the distribution pipe 30 is set in a one-to-one correspondence with the nodule detection holes 12.

[0021] Furthermore, such as Figure 1 As shown, a gas valve 120 is provided on the high-pressure nitrogen main pipe 20 between the branch pipe 40 and the distribution pipe 30. When the gas valve 120 is open, the high-pressure nitrogen in the high-pressure nitrogen main pipe 20 can reach the furnace throat nitrogen hole 11 and the nodule detection hole 12 through the distribution pipe 30, and then enter the furnace. When the gas valve 120 is closed, the high-pressure nitrogen is stopped from being supplied to the furnace throat nitrogen hole 11 and the nodule detection hole 12.

[0022] The blast furnace distributor 50 is a conventional device, and valves are usually installed at its inlet and outlet.

[0023] The working method of this utility model's blast furnace shut-off structure is as follows: After blast furnace 10 is shut down, the furnace top vent valve 60 is closed, and then the furnace throat nitrogen port 11 and the nodule detection port 12 are opened. High-pressure nitrogen gas is sequentially introduced into the nodule detection port 12 and the furnace throat nitrogen port 11 through the high-pressure nitrogen main pipe 20 and the distribution pipe 30. At the same time, high-pressure nitrogen gas is also sequentially introduced into the spray gun 13 through the high-pressure nitrogen main pipe 20, the branch pipe 40, and the blast furnace distributor 50. Nitrogen gas is introduced into the furnace through the furnace throat nitrogen port 11, the nodule detection port 12, and the spray gun 13. Combustible gases such as coal gas in the furnace rise and are discharged from the furnace top, realizing the replacement of combustible gases such as coal gas in the furnace by nitrogen gas, so that combustion in the furnace stops. After combustion in the furnace stops, the gas valve 120 and the valve of the spray gun 13 are closed, and the furnace enters the shut-off state.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent process transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A blast furnace shut-off structure, characterized in that: The system includes a blast furnace and a high-pressure nitrogen main pipe. The blast furnace has a nitrogen inlet at the top (throat), a nodule detection hole in the middle, and a spray lance at the bottom. One end of the high-pressure nitrogen main pipe is a high-pressure nitrogen inlet, and the other end is connected to a distribution pipe. The outlet of the distribution pipe is then connected to the nitrogen inlet at the throat and the nodule detection hole, respectively. A branch pipe is also connected to the wall of the high-pressure nitrogen main pipe, which is then connected to a blast furnace distributor. The outlet of the blast furnace distributor is then connected to the inlet of the spray lance. A gas sampling pipe is connected to the top of the blast furnace, and this gas sampling pipe is connected to a carbon monoxide testing device.

2. The blast furnace shut-down structure according to claim 1, characterized in that: The top of the blast furnace is connected to a riser pipe for drawing the blast furnace top gas upwards. The gas sampling pipe is located near the top of the riser pipe and is connected to the top of the blast furnace through the riser pipe.

3. The blast furnace shut-down structure according to claim 1, characterized in that: A pressure detector is installed on the top of the blast furnace, and an electric regulating valve is provided near the inlet end of the high-pressure nitrogen main pipe. The electric regulating valve is electrically connected to the pressure detector to transmit the pressure detection signal inside the furnace and regulate the high-pressure nitrogen intake.

4. The blast furnace shut-down structure according to claim 1, characterized in that: The spray guns are multiple and are evenly distributed along the circumference of the blast furnace; the blast furnace distributor has multiple outlets, and each outlet is connected to a spray gun in a one-to-one correspondence.

5. The blast furnace shut-down structure according to claim 1, characterized in that: There are three nodule detection holes, which are arranged at intervals along the height direction of the blast furnace; the outlet of the distribution pipe is set in a one-to-one correspondence with the nodule detection holes.

6. The blast furnace shut-down structure according to claim 1, characterized in that: A gas valve is provided on the high-pressure nitrogen main pipe between the branch pipe and the distribution pipe.

7. The blast furnace shut-down structure according to claim 1, characterized in that: The spray gun is a blast furnace pulverized coal injection gun.

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