Dust removal system and dust removal method for three-tap hole blast furnace equipment

Abstract

The application provides a dust removal system and method for a three-tap hole blast furnace equipment, which comprises a valve assembly, two dust removal units, and three dust removal inlets corresponding to the three tap holes of the blast furnace equipment. Each dust removal inlet is communicated with the two dust removal units through a main passage. The valve assembly is connected to the main passage between the dust removal inlet and the dust removal unit, and can conduct and cut off the main passage between each dust removal inlet and each dust removal unit. The application can meet the dust removal requirements of various working conditions of the three-tap hole blast furnace equipment, such as double-tap hole tapping, single-tap hole tapping, and fault maintenance. Moreover, the two dust removal units are independent of each other in each working condition, avoiding the problem of high system energy consumption caused by parallel connection, so that better dust removal effect can be achieved with lower energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace ironmaking, and in particular to a dust removal system and a dust removal method for a three-taphole blast furnace equipment. Background Art

[0002] During the molten iron production process, blast furnace equipment generates a large amount of dust as the taphole opens and closes, and as the molten iron flows, necessitating a dust removal system. The number of tapholes in a blast furnace varies depending on the specifications of the furnace, with a common blast furnace having three tapholes.

[0003] For blast furnaces with three tapholes, according to ironmaking process requirements, when the blast furnace is operating at high load, a maximum of two tapholes are permitted to tap iron. When the blast furnace is operating at low load, only one taphole is permitted. However, there is no specific requirement for which one or both tapholes are open; this is generally determined based on site conditions. Therefore, the taphole opening situation is subject to random variation. As the taphole opening situation changes, the operating conditions of the dust removal system also need to change accordingly.

[0004] Therefore, how to design a dust removal system for blast furnace equipment with three iron outlets so that the dust removal system can flexibly switch to different operating conditions as the opening conditions of the three iron outlets change, and achieve better dust removal effect with lower energy consumption, is a technical problem that technical personnel in this field need to solve. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a dust removal system for a three-tapout blast furnace equipment, wherein the dust removal system includes a valve assembly, two dust removal units, and three dust removal inlets corresponding to the three tapouts of the blast furnace equipment respectively; each of the dust removal inlets is connected to the two dust removal units through a main passage, and the valve assembly is connected to the main passage between the dust removal inlet and the dust removal unit, and can open and close the main passage between each dust removal inlet and each dust removal unit.

[0006] In one embodiment of a dust removal system for a three-taphole blast furnace device, the valve assembly includes a first valve member, a second valve member, a third valve member, and a fourth valve member for opening and closing the main passage;

[0007] The first valve member is connected to the first dust removal inlet of the first iron outlet of the blast furnace equipment and the main passage of the second dust removal unit. The first dust removal inlet and the main passage of the first dust removal unit are sequentially connected to the first valve member, the second valve member and the third valve member;

[0008] The second dust removal inlet corresponding to the second iron outlet of the blast furnace equipment is connected to the second valve member on the main passage of the second dust removal unit, and the second dust removal inlet is connected to the main passage of the first dust removal unit.

[0009] The third dust removal inlet corresponding to the third iron outlet of the blast furnace equipment is connected to the main passage of the second dust removal unit in sequence with the fourth valve part, the third valve part and the second valve part, and the third dust removal inlet is connected to the main passage of the first dust removal unit with the fourth valve part.

[0010] In one embodiment of a dust removal system for a three-taphole blast furnace device, the valve assembly includes a fifth valve component connected to a bypass passage between the outlet side of the first valve component and the outlet side of the fourth valve component.

[0011] An embodiment of a dust removal system for a three-taphole blast furnace equipment, wherein the valve assembly includes a fifth valve component, and the fifth valve component is connected to the main passage between the second dust removal inlet and the second valve component and to the main passage between the second dust removal inlet and the third valve component.

[0012] An implementation method of a dust removal system for a three-taphole blast furnace device, wherein the dust removal unit includes a dust collector, a fan, a muffler and an exhaust pipe.

[0013] In addition, the present application also provides a dust removal method for a three-taphole blast furnace equipment, which is implemented based on the dust removal system described in any one of the above items, and the dust removal method includes a double-taphole iron-pouring dust removal strategy; the double-taphole iron-pouring dust removal strategy is: let the two dust removal units be in a high-speed operation state, let the main passage between the dust removal inlet of one taphole corresponding to the current iron-pouring and one dust removal unit be in a conductive state, let the main passage between the dust removal inlet of another taphole corresponding to the current iron-pouring and another dust removal unit be in a conductive state, let the main passage between the remaining dust removal units and the dust removal inlets be in a cut-off state, so that the two dust removal units operate independently.

[0014] An implementation method of a dust removal method for a three-taphole blast furnace equipment, the dust removal method includes a single-taphole iron-pouring dust removal strategy, the single-taphole iron-pouring dust removal strategy is: let one dust removal unit be in a high-speed operation state, let the other dust removal unit be in a low-speed idling state, let the main passage between the dust removal inlet corresponding to the current iron-pouring and the high-speed running dust removal unit be in a conducting state, let the main passage between the dust removal inlet corresponding to another iron-pouring and the low-speed idling dust removal unit be in a conducting state, let the main passage between the remaining dust removal units and the dust removal inlets be in a cut-off state, so that the two dust removal units operate independently.

[0015] An implementation method of a dust removal method for a three-tapout blast furnace equipment, the dust removal method includes a single dust removal system fault dust removal strategy, the single dust removal system fault dust removal strategy is: let the normally operating dust removal unit be in a high-speed operation state, let the main path between all dust removal inlets and the faulty dust removal unit be in a cut-off state, and let the main path between the dust removal inlet corresponding to the current tapout and the normally operating dust removal unit be in a conducting state.

[0016] An implementation method of a dust removal method for a three-tapout blast furnace equipment is implemented based on the dust removal system described in the third item above; if the current tapout is the first tapout, and the currently faulty dust removal unit is the second dust removal unit, then the first valve member and the fifth valve member are opened, and the second valve member, the third valve member and the fourth valve member are closed, so that the first dust removal inlet is connected to the normally operating first dust removal unit; if the current tapout is the third tapout, and the currently faulty dust removal unit is the first dust removal unit, then the fourth valve member and the fifth valve member are opened, and the first valve member, the second valve member and the third valve member are closed, so that the third dust removal inlet is connected to the normally operating second dust removal unit.

[0017] An implementation method of a dust removal method for a three-tapout blast furnace equipment is implemented based on the dust removal system described in the fourth item above; if the current tapout is the first tapout, and the currently faulty dust removal unit is the second dust removal unit, then the first valve member, the second valve member and the third valve member are opened, and the fourth valve member and the fifth valve member are closed, so that the first dust removal inlet is connected to the normally operating first dust removal unit; if the current tapout is the third tapout, and the currently faulty dust removal unit is the first dust removal unit, then the second valve member, the third valve member and the fourth valve member are opened, and the first valve member and the fifth valve member are closed, so that the third dust removal inlet is connected to the normally operating second dust removal unit.

[0018] The dust removal system provided in the present application meets the dust removal requirements of the three-taphole blast furnace equipment under the double-taphole iron-pouring conditions and the single-taphole iron-pouring conditions by setting two dust removal units, three dust removal inlets and a valve assembly that can open and close the passage between each dust removal inlet and each dust removal unit. Moreover, under these two conditions, the two dust removal units can operate independently without being connected in parallel by reasonably selecting which main passages to open and close, thereby avoiding the problem of high system energy consumption caused by parallel connection, and thus achieving better dust removal effect with lower energy consumption.

[0019] Furthermore, when the valve assembly is provided with a fifth valve component, the dust removal system can also meet the dust removal requirements under the condition of fault maintenance of three-taphole blast furnace equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an embodiment of a dust removal system provided in this application;

[0021] Figure 2 A schematic diagram of another embodiment of the dust removal system provided in this application;

[0022] Figure 3 A schematic diagram of another embodiment of the dust removal system provided in this application;

[0023] Figure 4 for Figure 1 The operating condition table of the dust removal system shown;

[0024] Figure 5 for Figure 2 The operating condition table of the dust removal system shown;

[0025] Figure 6 for Figure 3 The operating conditions of the dust removal system are shown in the table.

[0026] The following are the descriptions of the reference numerals:

[0027] 101 first valve element, 102 second valve element, 103 third valve element, 104 fourth valve element, 105 fifth valve element;

[0028] 201 second dust removal unit, 202 first dust removal unit, 20a dust collector, 20b fan, 20c muffler, 20d exhaust pipe, 20e ash bin, 20f sending tank;

[0029] 301 is the first dust removal inlet, 302 is the second dust removal inlet, and 303 is the third dust removal inlet. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figure 1 As shown, the present application provides a dust removal system and dust removal method for a three-taphole blast furnace equipment.

[0032] The three tapholes of the three-taphole blast furnace equipment are the first taphole, the second taphole and the third taphole.

[0033] The dust removal system provided in this application includes a valve assembly, two dust removal units, and three dust removal inlets.

[0034] The two dust removal units are a second dust removal unit 201 and a first dust removal unit 202 .

[0035] The three dust removal inlets are the first dust removal inlet 301, the second dust removal inlet 302 and the third dust removal inlet 303. The first dust removal inlet 301, the second dust removal inlet 302 and the third dust removal inlet 303 correspond to the first iron outlet, the second iron outlet and the third iron outlet of the blast furnace equipment respectively.

[0036] Each dust removal inlet is connected to two dust removal units through a main passage.

[0037] The valve assembly is connected to the main passage between the dust removal inlet and the dust removal unit, and can open and close the main passage between each dust removal inlet and each dust removal unit. In other words, the main passage between each dust removal inlet and the second dust removal unit 201, as well as the main passage between each dust removal inlet and the first dust removal unit 202, can be switched to a conducting state or a closed state by the valve assembly.

[0038] The dust removal system provided in this application is provided with two dust removal units. If only one dust removal unit is provided, it is necessary to adjust the rotational speed of the fan of the dust removal unit to adapt to the different dust removal requirements under the single taphole iron-making working condition and the double taphole iron-making working condition of the blast furnace equipment. However, the rotational speed of the fan of the dust removal unit and the dust removal capacity of the dust removal unit are not a simple linear correspondence. Therefore, it is only possible to judge whether the rotational speed of the fan of the dust removal unit is appropriate by experience or with the help of an additionally installed flow metering device. The deviation is large based on experience. The additionally installed flow metering device is affected by the dust particles in the flue gas, and it is difficult to obtain more accurate data. At the same time, the particles easily clog the measuring hole and cause the flow metering device to frequently malfunction. Therefore, by adjusting the rotational speed of the fan of the dust removal unit to adjust the dust removal capacity of the dust removal unit to adapt to the dust removal requirements of different working conditions of the blast furnace, it is not practical and feasible in engineering practice. If three dust removal units are provided, not only will a large amount of layout space be taken up, but the investment cost will also be relatively high.

[0039] In comparison, since the dust removal system provided in the present application is provided with two dust removal units, it can meet the different dust removal requirements under the double-taphole iron-pocket iron-pocketing conditions and the single-taphole iron-pocketing conditions of the blast furnace equipment by activating two dust removal units (that is, letting both dust removal units be in a high-speed operating state) or activating one dust removal unit (the other dust removal unit is in a low-speed idle state or a shutdown state), without the need to adjust the speed of the fan of the dust removal unit to meet the dust removal requirements under different working conditions. Moreover, compared with the dust removal system with three dust removal units, the layout space occupied is smaller and the investment cost is lower.

[0040] In addition, since the main passage between each dust removal inlet and each dust removal unit of the dust removal system provided by this application can be opened and cut off by the valve assembly, it is possible to adapt to the different iron-tapping conditions of the blast furnace equipment by reasonably selecting which main passages to open and cut off and avoid the situation where two dust removal units operate in parallel.

[0041] The parallel operation of two dust removal units means that the two dust removal units extract gas from the same main passage. When two or more dust removal units of a dust removal system are operated in parallel, there is a negative pressure loss, which makes the total air volume of the dust removal system less than the algebraic sum of the air volumes when each dust removal unit is operated independently, which will lead to high energy consumption and low efficiency of the dust removal system. In addition, the operating status of the two or more dust removal units operating in parallel needs to be consistent, that is, they need to be in a high-speed operating state or in a low-speed idling state. If the operating status is inconsistent, the high-speed dust removal unit will have a strong suction effect on the low-speed idling dust removal unit, causing reverse flow in the low-speed idling dust removal unit, resulting in extremely high energy consumption of the dust removal system and unsatisfactory dust removal effect.

[0042] In summary, the dust removal system provided in the present application meets the dust removal requirements of the three-taps blast furnace equipment under double-taps iron-pouring conditions and single-taps iron-pouring conditions by setting two dust removal units, three dust removal inlets, and a valve assembly that can open and close the passage between each dust removal inlet and each dust removal unit. Moreover, under these two conditions, the two dust removal units can be operated independently without being connected in parallel by reasonably selecting which main passages to open and close, thereby avoiding the problem of high system energy consumption and low efficiency caused by parallel connection, and thus achieving better dust removal effect with lower energy consumption.

[0043] In one embodiment, Figure 1 As shown, the valve assembly includes a first valve component 101 , a second valve component 102 , a third valve component 103 and a fourth valve component 104 .

[0044] The first dust removal inlet 301 is connected to the first valve member 101 on the main passage of the second dust removal unit 201 , and the first dust removal inlet 301 is connected to the first valve member 101 , the second valve member 102 and the third valve member 103 in sequence on the main passage of the first dust removal unit 202 .

[0045] The second dust removal inlet 302 is connected to the second valve member 102 on the main passage of the second dust removal unit 201 , and the second dust removal inlet 302 is connected to the third valve member 103 on the main passage of the first dust removal unit 202 .

[0046] The third dust removal inlet 303 and the main passage of the second dust removal unit 201 are connected to the fourth valve component 104, the third valve component 103 and the second valve component 102 in sequence, and the third dust removal inlet 303 and the main passage of the first dust removal unit 202 are connected to the fourth valve component 104.

[0047] With this design, four valves can realize the connection and cutoff of the main passage between each dust removal inlet and each dust removal unit, making the dust removal system simple in structure and easy to operate.

[0048] Of course, the form of the valve assembly is not limited to the above design, and any form of valve assembly that can achieve the connection and cutoff of the main passage between each dust removal inlet and each dust removal unit can be used.

[0049] In one embodiment, Figure 2 and Figure 3 As shown, the valve assembly includes, in addition to the four valve components mentioned above, a fifth valve component 105 .

[0050] In one embodiment, Figure 2 As shown, a bypass passage is connected between the outlet side of the first valve member 101 and the outlet side of the fourth valve member 104 , and the fifth valve member 105 is connected to the bypass passage.

[0051] In one embodiment, Figure 3 As shown, the fifth valve member 105 is connected to the main passage between the second dust removal inlet 302 and the second valve member 102 and to the main passage between the second dust removal inlet 302 and the third valve member 103 .

[0052] By setting the above-mentioned fifth valve component 105, when a dust removal unit of the dust removal system fails, each dust removal inlet can be individually connected to another normally operating dust removal unit, so that dust removal can be performed through another normally operating dust removal unit, so that the dust removal system can meet the dust removal needs under the fault maintenance working condition of the three-iron-mouth blast furnace equipment.

[0053] In one embodiment, the dust removal unit includes a dust collector 20a, a fan 20b, a muffler 20c and an exhaust pipe 20d.

[0054] In one embodiment, the dust collector 20a is a pulse bag dust collector. The pulse bag dust collector uses compressed gas as the cleaning power. The pulse blowing mechanism releases compressed gas in an instant to induce several times the secondary gas to be injected into the filter bag at high speed, causing the filter bag to expand rapidly. The dust is cleaned by impact vibration and reverse airflow.

[0055] In one embodiment, the dust collector 20a has an online maintenance function, that is, each chamber of the dust collector 20a is provided with an independent offline maintenance valve. When an individual chamber is offline for maintenance, it does not affect the normal operation of other chambers. When the offline maintenance valves of all chambers are closed, the entire dust collector can be cut off.

[0056] In one embodiment, the dust collector 20a is provided with an ash bin 20e and a sending tank 20f. The intercepted dust enters the ash bin 20e and is then transported to the sintering batching tank through the sending tank 20f.

[0057] The dust removal method provided in this application includes a double-taphole iron-tapping dust removal strategy, a single-taphole iron-tapping dust removal strategy, and a single-dust removal system failure dust removal strategy.

[0058] Specifically, the dust removal strategy for double iron outlets is: let the two dust removal units run at high speed, let the main passage between the dust removal inlet of one iron outlet corresponding to the current iron outlet and one dust removal unit be in a conductive state, let the main passage between the dust removal inlet of another iron outlet corresponding to the current iron outlet and another dust removal unit be in a conductive state, and let the main passage between the remaining dust removal units and the dust removal inlets be in a cut-off state, so that the two dust removal units operate independently and not in parallel.

[0059] The double-taphole iron-pouring dust removal strategy enables the above-mentioned dust removal system to meet the dust removal requirements under the double-taphole iron-pouring working conditions of the blast furnace equipment, and enables the two dust removal units of the above-mentioned dust removal system to operate independently without being connected in parallel.

[0060] Specifically, the single-taphole dust removal strategy involves operating one dust removal unit at high speed and another at low idle speed. The main passage between the dust removal inlet corresponding to the current taphole and the high-speed dust removal unit is maintained, as is the main passage between the dust removal inlet corresponding to the other taphole and the low-speed dust removal unit. The main passages between the remaining dust removal units and the dust removal inlets are blocked, allowing the two dust removal units to operate independently and not in parallel. By idling the other dust removal unit at low idle speed, reactivating it minimizes the impact on the power grid, thus ensuring system safety.

[0061] The single taphole iron-pouring dust removal strategy enables the dust removal system to meet the dust removal requirements under the single taphole iron-pouring working condition of the blast furnace equipment, and enables the two dust removal units of the dust removal system to operate independently without parallel connection.

[0062] Specifically, the dust removal strategy for a single dust removal unit failure is as follows: The normally functioning dust removal unit is operated at high speed, the main pathways between all dust removal inlets and the faulty dust removal unit are cut off, and the dust removal inlet corresponding to the current tapping point is connected to the normally functioning dust removal unit. More specifically, the dust removal inlet corresponding to the current tapping point can be connected to the normally functioning dust removal unit via the main pathway, or via both the main pathway and a bypass pathway.

[0063] The single dust removal system fault dust removal strategy enables the dust removal system to cut off the main passages between all dust removal inlets and the faulty dust removal unit when one dust removal unit fails, and use another normally operating dust removal unit for dust removal.

[0064] Figure 1 The embodiment shown can realize the above-mentioned double taphole iron-outlet dust removal strategy and single taphole iron-outlet dust removal strategy, but cannot realize the above-mentioned single dust removal unit failure dust removal strategy. Its dust removal working condition table is as follows: Figure 4 As shown, when tapping iron from a double taphole or a single taphole, the second dust removal unit and the first dust removal unit are operated independently and not in parallel.

[0065] Figure 2 The embodiment shown can realize the above-mentioned double taphole iron tapping dust removal strategy, single taphole iron tapping dust removal strategy and single dust removal unit failure dust removal strategy, and its dust removal working condition table is as follows: Figure 5 As shown, when tapping iron from a double taphole or a single taphole, the second dust removal unit and the first dust removal unit operate independently and are not connected in parallel. Moreover, when one dust removal unit fails, the entire dust removal system can continue to operate and rely on the other dust removal unit to continue dust removal.

[0066] Figure 3 The embodiment shown can realize the above-mentioned double taphole iron tapping dust removal strategy, single taphole iron tapping dust removal strategy and single dust removal unit failure dust removal strategy, and its dust removal working condition table is as follows: Figure 6 As shown, when tapping iron from a double taphole or a single taphole, the second dust removal unit and the first dust removal unit operate independently and are not connected in parallel. Moreover, when one dust removal unit fails, the entire dust removal system can continue to operate and rely on the other dust removal unit to continue dust removal.

[0067] In summary, the dust removal system provided by the present application meets the dust removal needs of the three-taphole blast furnace equipment under the double-taphole iron-pouring working condition and the single-taphole iron-pouring working condition by setting two dust removal units, three dust removal inlets, and a valve assembly that can open and close the passage between each dust removal inlet and each dust removal unit. Moreover, under these two working conditions, the two dust removal units can be operated independently and not in parallel by reasonably selecting which main passages to open and close, thus avoiding the problem of high system energy consumption caused by parallel connection, and thus achieving better dust removal effect with lower energy consumption. Furthermore, when the valve assembly is provided with a fifth valve component, the dust removal system can also meet the dust removal needs of the three-taphole blast furnace equipment under the fault maintenance working condition.

[0068] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A dust removal system for a three-taphole blast furnace, characterized in that: The dust removal system includes a valve assembly, two dust removal units, and three dust removal inlets corresponding to the three iron tapping holes of the blast furnace equipment; each of the dust removal inlets is connected to the two dust removal units through a main passage, and the valve assembly is connected to the main passage between the dust removal inlet and the dust removal unit, and can open and close the main passage between each dust removal inlet and each dust removal unit; The valve assembly comprises a first valve component (101), a second valve component (102), a third valve component (103) and a fourth valve component (104) for opening and closing the main passage; The first valve member (101) is connected to a main passage between a first dust removal inlet (301) corresponding to a first iron outlet of the blast furnace equipment and a second dust removal unit (201), and the first valve member (101), the second valve member (102) and the third valve member (103) are sequentially connected to a main passage between the first dust removal inlet (301) and the first dust removal unit (202); The second valve member (102) is connected to the main passage between the second dust removal inlet (302) corresponding to the second iron outlet of the blast furnace equipment and the second dust removal unit (201), and the third valve member (103) is connected to the main passage between the second dust removal inlet (302) and the first dust removal unit (202); The fourth valve member (104), the third valve member (103) and the second valve member (102) are sequentially connected to the main passage between the third dust removal inlet (303) corresponding to the third iron outlet of the blast furnace equipment and the second dust removal unit (201), and the fourth valve member (104) is connected to the main passage between the third dust removal inlet (303) and the first dust removal unit (202); The valve assembly includes a fifth valve member (105), and the fifth valve member (105) is connected to a bypass passage between the outlet side of the first valve member (101) and the outlet side of the fourth valve member (104), or the fifth valve member (105) is connected to a main passage between the second dust removal inlet (302) and the second valve member (102) and to a main passage between the second dust removal inlet (302) and the third valve member (103).

2. The dust removal system for a three-taphole blast furnace according to claim 1, characterized in that: The dust removal unit comprises a dust collector (20a), a fan (20b), a muffler (20c) and an exhaust pipe (20d).

3. A dust removal method for a three-taphole blast furnace, implemented based on the dust removal system according to any one of claims 1 to 2, characterized in that: The dust removal method includes a double-taphole iron-pouring dust removal strategy, which is: let the two dust removal units run at a high speed, let the main passage between the dust removal inlet of one taphole corresponding to the current iron-pouring and one dust removal unit be in a conducting state, let the main passage between the dust removal inlet of another taphole corresponding to the current iron-pouring and another dust removal unit be in a conducting state, let the main passage between the two dust removal units and the remaining dust removal inlets be in a cut-off state, so that the two dust removal units operate independently.

4. The dust removal method for a three-taphole blast furnace according to claim 3, characterized in that: The dust removal method includes a single iron tapping dust removal strategy, which is as follows: one dust removal unit is in a high-speed operation state, the other dust removal unit is in a low-speed idling state, the main passage between the dust removal inlet corresponding to the current iron tapping and the high-speed dust removal unit is in a conducting state, the main passage between the dust removal inlet corresponding to the other iron tapping and the low-speed idling dust removal unit is in a conducting state, the main passage between the two dust removal units and the remaining dust removal inlets is in a cut-off state, and the two dust removal units operate independently.

5. The dust removal method for a three-taphole blast furnace according to claim 3 or 4, characterized in that: The dust removal method includes a single dust removal system fault dust removal strategy, and the single dust removal system fault dust removal strategy is: let the normally operating dust removal unit be in a high-speed operation state, let the main path between all dust removal inlets and the faulty dust removal unit be in a cut-off state, and let the main path between the dust removal inlet corresponding to the current iron outlet and the normally operating dust removal unit be in a conducting state.

6. The dust removal method for a three-taphole blast furnace according to claim 5, characterized in that: The fifth valve member (105) is connected to a bypass passage between the outlet side of the first valve member (101) and the outlet side of the fourth valve member (104); If the current tapping port is the first tapping port and the current faulty dust removal unit is the second dust removal unit (201), the first valve member (101) and the fifth valve member (105) are opened, and the second valve member (102), the third valve member (103) and the fourth valve member (104) are closed, so that the first dust removal inlet (301) is connected to the normally operating first dust removal unit (202); If the current tapping port is the third tapping port and the current faulty dust removal unit is the first dust removal unit (202), the fourth valve member (104) and the fifth valve member (105) are opened, and the first valve member (101), the second valve member (102) and the third valve member (103) are closed, so that the third dust removal inlet (303) is connected to the normally operating second dust removal unit (201).

7. The dust removal method for a three-taphole blast furnace according to claim 5, characterized in that: The fifth valve member (105) is connected to the main passage between the second dust removal inlet (302) and the second valve member (102), and to the main passage between the second dust removal inlet (302) and the third valve member (103); If the current tapping port is the first tapping port and the current faulty dust removal unit is the second dust removal unit (201), the first valve member (101), the second valve member (102) and the third valve member (103) are opened, and the fourth valve member (104) and the fifth valve member (105) are closed, so that the first dust removal inlet (301) is connected to the normally operating first dust removal unit (202); If the current tapping port is the third tapping port and the current faulty dust removal unit is the first dust removal unit (202), the second valve member (102), the third valve member (103) and the fourth valve member (104) are opened, and the first valve member (101) and the fifth valve member (105) are closed, so that the third dust removal inlet (303) is connected to the normally operating second dust removal unit (201).

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