Dust removal system of four-tap-hole blast furnace equipment

Abstract

The utility model provides a dust removal system of four-tap-hole blast furnace equipment, which is characterized in that each dust removal inlet is communicated with two dust removal units through a valve assembly module, and the valve assembly module comprises a plurality of valves; when the valves are in different working states, the passages between the corresponding dust removal inlets and the corresponding dust removal units are closed or opened; valves arranged on passages between the two dust removal units and the same dust removal inlet are different; that is to say, any one or two dust removal inlets can be selected to be communicated with the corresponding dust removal units by controlling the on-off state of each valve, so that the dust removal inlets can be communicated with the corresponding dust removal units under any working condition that any two or any one iron outlet of the four-iron-outlet blast furnace equipment discharges iron. The dust removal system provided by the utility model can meet the dust removal requirement of the four-tap-hole blast furnace equipment; the two dust removal units operate independently under various working conditions, negative pressure loss of air volume does not exist, the dust removal flexibility of the dust removal system is improved, and the constraint of process operation conditions is got rid of.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace ironmaking, and more specifically, particularly relates to a dust removal system for a blast furnace equipment with four tapholes. Background Art

[0002] In iron and steel metallurgy enterprises, a blast furnace is a key process facility for smelting iron ore into molten iron. However, during the production process, the opening of the taphole and the flow of molten iron will generate a large amount of flue gas. In order to meet the hygiene requirements and keep the production environment clean, a taphole yard dust removal system must be set up to collect this flue gas.

[0003] For a large blast furnace with four tapholes, a diagonal tapping system is usually adopted, that is, two opposite tapholes are taken as a group. A large blast furnace can be regarded as two medium-sized blast furnaces with double tapholes. Therefore, two sets of dust removal systems can be set up, with each set corresponding to a medium-sized blast furnace with double tapholes.

[0004] However, when two tapholes in the same group tap iron simultaneously, the existing dust removal system may not be able to provide sufficient dust removal capacity, resulting in the flue gas not being effectively captured, thus affecting the on-site environment. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a dust removal system for a blast furnace equipment with four tapholes, which can meet the dust removal requirements of the blast furnace equipment under any working conditions, such as when any two tapholes or any one taphole of the blast furnace equipment are working.

[0006] The present application discloses a dust removal system for a blast furnace equipment with four tapholes, including: a valve assembly module, two dust removal units, and four dust removal inlets;

[0007] The first taphole of the blast furnace equipment is communicated with the first dust removal inlet;

[0008] The second taphole of the blast furnace equipment is communicated with the second dust removal inlet;

[0009] The third taphole of the blast furnace equipment is communicated with the third dust removal inlet;

[0010] The fourth taphole of the blast furnace equipment is communicated with the fourth dust removal inlet;

[0011] Each of the dust removal inlets is communicated with the two dust removal units through the valve assembly module. The valve assembly module includes a plurality of valves; when the valves are in different working states, the passage between the corresponding dust removal inlet and the corresponding dust removal unit is cut off or conducted; the valves provided on the passage between the two dust removal units and the same dust removal inlet are different.

[0012] Optionally, at least one of the valves is provided on the path between each dust removal inlet and each dust removal unit.

[0013] Optionally, the valve assembly module includes: a first valve, a second valve, a third valve, a fourth valve, and a fifth valve;

[0014] The first end of the first valve communicates with the fourth dust removal inlet;

[0015] The second end of the first valve communicates with the first end of the second valve and the first dust removal unit respectively;

[0016] The second end of the second valve communicates with the first dust removal inlet and the first end of the third valve respectively;

[0017] The second end of the third valve communicates with the second dust removal inlet and the first end of the fourth valve respectively;

[0018] The second end of the fourth valve communicates with the second dust removal unit and the second end of the fifth valve respectively;

[0019] The first end of the fifth valve communicates with the third dust removal inlet.

[0020] Optionally, the valve assembly module further includes a sixth valve;

[0021] The sixth valve is provided at the common point of the second valve and the third valve, and between the first dust removal inlet.

[0022] Optionally, the valve assembly module further includes: a seventh valve;

[0023] The seventh valve is provided at the common point of the third valve and the fourth valve, and between the second dust removal inlet.

[0024] Optionally, the dust removal unit includes a dust collector, a fan, and an exhaust stack.

[0025] Optionally, the dust removal unit further includes a silencer.

[0026] Optionally, the dust collector is a pulse bag filter.

[0027] Optionally, each valve is a remotely controllable valve.

[0028] Optionally, the remotely controllable valve includes: an electric valve or a pneumatic valve.

[0029] As can be seen from the above technical solution, a dust removal system for a four-tuyere blast furnace equipment provided by the present utility model is as follows: Each dust removal inlet is connected to two dust removal units through a valve assembly module, and the valve assembly module includes a plurality of valves; when the valves are in different working states, the passage between the corresponding dust removal inlet and the corresponding dust removal unit is cut off or conducted; the valves provided on the passage between the two dust removal units and the same dust removal inlet are different; that is to say, by controlling the on-off states of the respective valves in the valve assembly module, it is possible to select any one or any two dust removal inlets to be conducted with the corresponding dust removal units, so that in any working conditions such as when any two tuyeres or any one tuyere of the four-tuyere blast furnace equipment are working, the dust removal system provided by the present application can meet the dust removal requirements of the four-tuyere blast furnace equipment; at the same time, the two dust removal units operate independently under each working condition, and there is no negative pressure loss of air volume; the tapping flexibility of the four-tuyere blast furnace equipment and the dust removal flexibility of the dust removal system are improved, and the constraints of the process operating conditions are eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 FIG. 9 is a schematic diagram of a dust removal system for a four-tuyere blast furnace equipment provided by an embodiment of the present utility model;

[0032] Figures 2 - 19 FIG. 13 is a working schematic diagram related to a dust removal system for a four-tuyere blast furnace equipment provided by an embodiment of the present utility model.

[0033] The description of the reference numerals is as follows:

[0034] 21 is the first valve, 22 is the second valve, 23 is the third valve, 24 is the fourth valve, 25 is the fifth valve; 26 is the sixth valve; 27 is the seventh valve; 311 is the first dust removal unit, 312 is the second dust removal unit, 31 is the dust collector, 32 is the fan, 33 is the silencer, 34 is the exhaust stack; 11 is the first dust removal inlet, 12 is the second dust removal inlet, 13 is the third dust removal inlet; 14 is the fourth dust removal inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] In this application, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article, or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element. In addition, the terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above accompanying drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0037] It should be noted that blast furnaces are provided with 1 to 4 tapholes according to their scale. The operation process of each taphole is completely independent; specifically, small blast furnaces generally have one taphole; medium-sized blast furnaces generally have two tapholes; large blast furnaces generally have three or four tapholes.

[0038] When the molten iron in the blast furnace needs to be discharged, the taphole is drilled open by a taphole drilling machine, and a large amount of dust is generated during the drilling process. After the taphole is drilled through, with the gushing out of the molten iron, dust begins to be generated at the iron runner, slag-iron separation mechanism, swing nozzle, etc. Therefore, from the moment the taphole drilling machine starts working, the supporting dust removal system needs to enter a high-speed operation state to suck harmful dust. When the molten iron storage in the blast furnace is lower than the lower limit value, the taphole needs to be blocked to prevent the continuous gushing out of the molten iron. At this time, a clay gun near the taphole injects special gun clay into the taphole to block the taphole. A large amount of dust still escapes during the operation of the clay gun. However, when the taphole is completely blocked, as the residual iron in the runner drains out, the dust gradually dissipates. The dust removal system stops running or enters a low-speed operation state, waiting for the next tapping operation.

[0039] The blast furnace taphole operates on an intermittent working system, and the corresponding dust removal system also operates in an intermittent and discontinuous state.

[0040] For a large blast furnace with four tapping holes, the ironmaking process requires a diagonal tapping system. That is, every two of the four tapping holes that are opposite to each other form a group, and the two tapping holes within each group do not tap iron simultaneously. Thus, a large blast furnace with four conventional tapping holes can be regarded as two medium-sized blast furnaces with double tapping holes, and two sets of dust removal systems can be set up in the tapping yard according to the mode of a medium-sized blast furnace with double tapping holes.

[0041] However, in some special cases, there may be a working condition where two tapping holes in the same tapping yard tap iron simultaneously. Although the frequency of this situation is not high, once this working condition occurs, the existing four-tapping-hole dust removal system will not be able to meet the dust removal capacity required for two tapping holes to tap iron simultaneously, resulting in serious spillage of on-site smoke and dust, which cannot be effectively captured. Therefore, the dust removal system in the closest technical solution lacks flexibility.

[0042] Based on this, the embodiment of the present application discloses a dust removal system for a blast furnace device with four tapping holes, which can effectively remove dust under the working condition that any two tapping holes tap iron simultaneously, meet the dust removal requirements for the working condition that any two tapping holes tap iron simultaneously, and has good flexibility.

[0043] Technical terms:

[0044] Blast furnace: A smelting furnace for extracting pig iron from iron ore, which is a vertical cylindrical shape with its inner wall lined with refractory materials.

[0045] Blast furnace tapping yard: The place where iron is tapped during the smelting process of a blast furnace, including the places where production facilities such as tapping holes, main troughs, sand mouths, iron troughs, slag troughs, ladle positions, and swinging spouts are located, also known as the front of the blast furnace.

[0046] Pulse jet bag filter: A bag filter that uses compressed gas as the dust cleaning power, utilizes the compressed gas released instantaneously by the pulse jet mechanism to induce several times of secondary gas to shoot into the filter bag at high speed, causing the filter bag to expand sharply, and cleaning the dust by relying on impact vibration and reverse air flow. Large pulse jet bag filters all have an on-line maintenance function, that is, each chamber is provided with an independent off-line maintenance valve. When an individual chamber is under off-line maintenance, it does not affect the normal operation of other chambers. When all the off-line maintenance valves of all chambers are closed, the entire dust collector passage can be cut off.

[0047] Parallel fan negative pressure loss: When two or more fans operate in parallel in a system, the total system air volume is less than the algebraic sum of the air volumes of each fan when operating independently. The higher the fan negative pressure, the greater the impact on other fans after parallel connection, and the smaller the total system air volume.

[0048] See Figure 1 , The dust removal system for the blast furnace device with four tapping holes includes: a valve component module, two dust removal units, and four dust removal inlets.

[0049] The first tapping hole of the blast furnace device is connected to the first dust removal inlet 11.

[0050] The second tapping hole of the blast furnace equipment is connected to the second dust removal inlet 12.

[0051] The third tapping hole of the blast furnace equipment is connected to the third dust removal inlet 13.

[0052] The fourth tapping hole of the blast furnace equipment is connected to the fourth dust removal inlet 14.

[0053] That is to say, the four dust removal inlets of the dust removal system correspond one by one to the four tapping holes of the blast furnace equipment, and each dust removal inlet is connected to its corresponding tapping hole, so that each tapping hole enters the dust removal system through its corresponding dust removal inlet.

[0054] The first tapping hole and the fourth tapping hole can both be arranged in the first tapping yard, and the third tapping hole and the second tapping hole are both arranged in the second tapping yard.

[0055] Each dust removal inlet is connected to two dust removal units through a passage, valves are arranged on each passage, and each valve constitutes a valve assembly module.

[0056] This dust removal system plays a crucial role in the blast furnace smelting process. It is mainly used to collect the dust contained in the blast furnace flue gas to reduce environmental pollution.

[0057] Each dust removal inlet is connected to two dust removal units through a valve assembly module. The valve assembly module includes multiple valves; when the valves are in different working states, the passage between the corresponding dust removal inlet and the corresponding dust removal unit is cut off or conducted; the valves arranged on the passages between the two dust removal units and the same dust removal inlet are different.

[0058] That is to say, any dust removal inlet can be connected to two dust removal units through a valve assembly module, and thus the conduction or truncation between the dust removal inlet and the two dust removal units can be controlled. The valve assembly is connected to the passage between the dust removal inlet and the dust removal unit and can conduct and cut off the passage between each dust removal inlet and each dust removal unit. That is to say, the passage between each dust removal inlet and the first dust removal unit 311 and the passage between each dust removal inlet and the second dust removal unit 312 can both be switched to the conduction state through the valve assembly module, or can be switched to the truncation state through the valve assembly respectively.

[0059] It should be noted that since the valves arranged on the passages between the two dust removal units and the same dust removal inlet are different; that is, the two dust removal units are not directly connected; that is to say, the two dust removal units are independent of each other and there will be no air volume negative pressure loss.

[0060] Specifically, the number of valves is not specifically limited here, as long as any one dust removal inlet can work independently, or any two dust removal inlets can work independently, any one dust removal unit or two units can perform dust removal, so that when each tapping hole works independently or any two tapping holes work, the dust removal system can meet the dust removal requirements.

[0061] In this embodiment, the first tapping hole of the blast furnace equipment is communicated with the first dust removal inlet; the second tapping hole of the blast furnace equipment is communicated with the second dust removal inlet; the third tapping hole of the blast furnace equipment is communicated with the third dust removal inlet; the fourth tapping hole of the blast furnace equipment is communicated with the fourth dust removal inlet; each dust removal inlet is communicated with two dust removal units through a valve assembly module, and the valve assembly module includes a plurality of valves; when the valves are in different working states, the passage between the corresponding dust removal inlet and the corresponding dust removal unit is cut off or conducted; the valves arranged on the passage between two dust removal units and the same dust removal inlet are different; that is to say, by controlling the on-off states of the valves in the valve assembly module, any one or any two dust removal inlets can be selected to be conducted with the corresponding dust removal units, so that in any working conditions such as any two or any one of the four tapping holes of the four-tapping-hole blast furnace equipment are working, the dust removal system provided by the present application can meet the dust removal requirements of the four-tapping-hole blast furnace equipment; at the same time, the two dust removal units operate independently in each working condition, and there is no negative pressure loss of air volume; the tapping flexibility of the four-tapping-hole blast furnace equipment and the dust removal flexibility of the dust removal system are improved, and the constraints of the process operation conditions are eliminated.

[0062] Optionally, at least one valve is arranged on the passage between each dust removal inlet and each dust removal unit.

[0063] The valves arranged on the passage between any one dust removal inlet and two dust removal units are different; the valves arranged on the passage between each dust removal inlet and any one dust removal unit are also different; of course, there can be shared valves, as long as the passage between each dust removal inlet and each dust removal unit can be independently controlled, so that any dust removal unit can work independently.

[0064] Specifically, at least one valve is provided on the passage between the first dust removal inlet 11 and the first dust removal unit 311; at least one valve is provided on the passage between the first dust removal inlet 11 and the second dust removal unit 312; at least one valve is provided on the passage between the second dust removal inlet 12 and the first dust removal unit 311; at least one valve is provided on the passage between the second dust removal inlet 12 and the second dust removal unit 312; at least one valve is provided on the passage between the third dust removal inlet 13 and the first dust removal unit 311; at least one valve is provided on the passage between the third dust removal inlet 13 and the second dust removal unit 312; at least one valve is provided on the passage between the fourth dust removal inlet 14 and the first dust removal unit 311; at least one valve is provided on the passage between the fourth dust removal inlet 14 and the second dust removal unit 312.

[0065] All the valves between the first dust removal inlet 11 and the first dust removal unit 311 are different from all the valves between the first dust removal inlet 11 and the second dust removal unit 312. Of course, there can be shared valves. For example, all the valves between the first dust removal inlet 11 and the first dust removal unit 311 are valve A; all the valves between the first dust removal inlet 11 and the second dust removal unit 312 are valve B; it can also be that all the valves between the first dust removal inlet 11 and the first dust removal unit 311 are valve A; all the valves between the first dust removal inlet 11 and the second dust removal unit 312 are valve A and valve B, and there is a situation where valve A is shared here; the same applies to other dust removal inlets and dust removal units, and details will not be elaborated here.

[0066] All the valves between the first dust removal unit 311 and the first dust removal inlet 11, all the valves between the first dust removal unit 311 and the second dust removal inlet 12, all the valves between the first dust removal unit 311 and the third dust removal inlet 13, and all the valves between the first dust removal unit 311 and the fourth dust removal inlet 14 are different. Of course, there can also be shared valves. The same applies to the second dust removal unit 312, and details will not be elaborated here.

[0067] Generally, when two tapping holes are tapping, two dust removal units are required for dust removal; when one tapping hole is tapping, one dust removal unit is required for dust removal. Furthermore, when the two tapping holes are working, the corresponding relationship between the tapping holes and the dust removal units can be selected. For example, the valve between the first dust removal unit 311 and the first dust removal inlet 11 is opened, and the first dust removal unit 311 removes dust from the corresponding flue gas of the first tapping hole; the valve between the second dust removal unit 312 and the third dust removal inlet 13 is opened, and the first dust removal unit 311 removes dust from the corresponding flue gas of the third tapping hole; of course, the second dust removal unit 312 and the first dust removal unit 311 can also be swapped. When one tapping hole changes its operation, any one of the two dust removal units can be selected to work independently.

[0068] In this embodiment, the connection relationship between each dust removal unit and each dust removal inlet can be independently controlled, so that it can be applied to the operation of any one or any two tapping holes, and at the same time, the corresponding dust removal unit can be selected for dust removal; it is also possible to select the corresponding dust removal unit to work independently, and the two dust removal units operate independently without generating the negative pressure loss of the parallel operation of high-pressure blowers.

[0069] Optionally, the valve assembly module includes: a first valve 21, a second valve 22, a third valve 23, a fourth valve 24, and a fifth valve 25.

[0070] The first end of the first valve 21 is communicated with the fourth dust removal inlet 14.

[0071] The second end of the first valve 21 is respectively communicated with the first end of the second valve 22 and the first dust removal unit 311.

[0072] The second end of the second valve 22 is respectively communicated with the first dust removal inlet 11 and the first end of the third valve 23.

[0073] The second end of the third valve 23 is respectively communicated with the second dust removal inlet 12 and the first end of the fourth valve 24.

[0074] The second end of the fourth valve 24 is respectively communicated with the second dust removal unit 312 and the second end of the fifth valve 25.

[0075] The first end of the fifth valve 25 is communicated with the third dust removal inlet 13.

[0076] That is to say, a first valve 21 is provided on the passage between the first dust removal inlet 11 and the first dust removal unit 311; a first valve 21, a second valve 22, a third valve 23, and a fourth valve 24 are sequentially provided on the passage between the first dust removal inlet 11 and the second dust removal unit 312.

[0077] A second valve 22 is provided on the passage between the second dust removal inlet 12 and the first dust removal unit 311, and a third valve 23 and a fourth valve 24 are provided on the passage between the second dust removal inlet 12 and the second dust removal unit 312.

[0078] A third valve 23 and a second valve 22 are sequentially provided on the passage between the third dust removal inlet 13 and the first dust removal unit 311, and a fourth valve 24 is provided on the passage between the third dust removal inlet 13 and the second dust removal unit 312.

[0079] A fifth valve 25, a fourth valve 24, a third valve 23, and a second valve 22 are sequentially provided on the passage fan between the fourth dust removal inlet 14 and the first dust removal unit 311; a fifth valve 25 is provided on the passage between the fourth dust removal inlet 14 and the second dust removal unit 312.

[0080] That is to say, five valves can realize the conduction and cut-off of the passage between each dust removal inlet and each dust removal unit, making the structure of the dust removal system simple and easy to control.

[0081] Of course, the form of the valve assembly module is not limited to the above design, and any form of valve assembly that can realize the conduction and cut-off of the passage between each dust removal inlet and each dust removal unit is acceptable.

[0082] Optionally, the valve assembly module further includes a sixth valve 26.

[0083] The sixth valve 26 is arranged at the common point of the second valve 22 and the third valve 23, and between the first dust removal inlet 11.

[0084] Specifically, the first end of the first valve 21 is communicated with the fourth dust removal inlet 14.

[0085] The second end of the first valve 21 is respectively communicated with the first end of the second valve 22 and the first dust removal unit 311.

[0086] The second end of the second valve 22 is respectively communicated with the first end of the third valve 23 and the second end of the sixth valve 26.

[0087] The first end of the sixth valve 26 is communicated with the first dust removal inlet 11.

[0088] The second end of the third valve 23 is respectively communicated with the second dust removal inlet 12 and the first end of the fourth valve 24.

[0089] The second end of the fourth valve 24 is respectively communicated with the second dust removal unit 312 and the second end of the fifth valve 25.

[0090] The first end of the fifth valve 25 is communicated with the third dust removal inlet 13.

[0091] Optionally, the valve assembly module further includes: a seventh valve 27.

[0092] The seventh valve 27 is arranged at the common point of the third valve 23 and the fourth valve 24, and between the second dust removal inlet 12.

[0093] Specifically, the first end of the first valve 21 is communicated with the fourth dust removal inlet 14.

[0094] The second end of the first valve 21 is respectively communicated with the first end of the second valve 22 and the first dust removal unit 311.

[0095] The second end of the second valve 22 is respectively communicated with the first dust removal inlet 11 and the first end of the third valve 23.

[0096] The second end of the third valve 23 is communicated with the first end of the fourth valve 24 and the second end of the seventh valve 27 respectively.

[0097] The first end of the seventh valve 27 is communicated with the second dust removal inlet 12.

[0098] The second end of the fourth valve 24 is communicated with the second dust removal unit 312 and the second end of the fifth valve 25 respectively.

[0099] The first end of the fifth valve 25 is communicated with the third dust removal inlet 13.

[0100] By setting the above-mentioned sixth valve 26 and seventh valve 27, when a dust removal unit of the dust removal system fails, each dust removal inlet can be independently communicated with another normally operating dust removal unit, so that dust removal can be carried out through another normally operating dust removal unit, enabling the dust removal system to meet the dust removal requirements under the working conditions of equipment failure maintenance of a blast furnace with four tapholes.

[0101] The above-mentioned first valve 21 to seventh valve 27 can all be remotely controllable valves.

[0102] The remotely controllable valve includes an electric valve or a pneumatic valve. Of course, it can also be other remotely controllable valves, which will not be elaborated here one by one.

[0103] This application does not adopt a summary pipeline, which can ensure that under any working conditions, the two dust removal systems are in an independent working state, eliminating the negative pressure loss generated by the parallel operation of high-pressure fans, improving the operation efficiency of the dust removal system, and reducing the energy consumption of the dust removal system.

[0104] In this embodiment, the dust removal system has a unique pipeline connection method, a unique valve setting method, and a unique operation mode under various working conditions. The dust removal system provided by this application does not need to consider the process conditions of whether two tapholes in the same tapping yard are tapping simultaneously. When any two of the four tapholes are tapping, the dust removal system provided by this application can independently carry out dust removal operations on each tapping taphole.

[0105] By adjusting the different opening and closing states of the above 7 valves, a complete operation mode of the tapping yard dust removal system is formed, which is applicable to the dust removal operations of a four-taphole blast furnace equipment under various working conditions.

[0106] The dust removal method provided by this application includes a dust removal strategy for double taphole tapping, a dust removal strategy for single taphole tapping, and a dust removal strategy for single dust removal system failure.

[0107] Specifically, the tapping dust removal strategy for two tapping holes is as follows: keep the two dust removal units running at high speed, keep the passage between the dust removal inlet corresponding to one tapping hole for the current tapping and one dust removal unit in a conducting state, keep the passage between the dust removal inlet corresponding to the other tapping hole for the current tapping and the other dust removal unit in a conducting state, and keep the passages between the remaining dust removal units and the dust removal inlets in a cut-off state, so that the two dust removal units operate independently without being connected in parallel.

[0108] The tapping dust removal strategy for two tapping holes can enable the above dust removal system to meet the dust removal requirements under the tapping conditions of the blast furnace equipment with two tapping holes. Moreover, it can enable the two dust removal units of the above dust removal system to operate independently without being connected in parallel.

[0109] The tapping dust removal strategy for a single tapping hole is as follows: keep one dust removal unit running at high speed and the other dust removal unit running at low speed or idling. Keep the passage between the dust removal inlet corresponding to the tapping hole for the current tapping and the dust removal unit running at high speed in a conducting state, and keep the passage between the dust removal inlet corresponding to the other tapping hole and the dust removal unit running at low speed in a conducting state. Keep the passages between the remaining dust removal units and the dust removal inlets in a cut-off state, so that the two dust removal units operate independently without being connected in parallel. Keeping the other dust removal unit running at low speed or idling results in a small impact on the power grid when this unit is restarted, which is beneficial to ensuring system safety.

[0110] The tapping dust removal strategy for a single tapping hole can enable the above dust removal system to meet the dust removal requirements under the tapping conditions of the blast furnace equipment with a single tapping hole. Moreover, it can enable the two dust removal units of the above dust removal system to operate independently without being connected in parallel.

[0111] The dust removal strategy for a single faulty dust removal unit is as follows: keep the normally operating dust removal unit running at high speed, keep all the passages between the dust removal inlets and the faulty dust removal unit in a cut-off state, and keep the passage between the dust removal inlet corresponding to the tapping hole for the current tapping and the normally operating dust removal unit in a conducting state. More specifically, the passage between the dust removal inlet corresponding to the tapping hole for the current tapping and the normally operating dust removal unit can be made to conduct through a passage.

[0112] The dust removal strategy for a single faulty dust removal system can enable the above dust removal system, when one dust removal unit is faulty, to cut off all the passages between the dust removal inlets and the faulty dust removal unit and use the other normally operating dust removal unit for dust removal.

[0113] It should be noted that any passage being in a conducting state means that all the valves on that passage are in a conducting state, and any passage being in a cut-off state means that at least one valve on that passage is in a cut-off state.

[0114] Its dust removal working conditions are shown in Table 1. When tapping from double tapping holes or single tapping hole, the first dust removal unit 311 and the second dust removal unit 312 operate independently and are not in parallel. Moreover, when one dust removal unit fails, the entire dust removal system can continue to operate, relying on the other dust removal unit to continue dust removal.

[0115] Table 1: Dust removal working conditions

[0116]

[0117] In Table 1, 1# represents the first tapping hole, 2# represents the second tapping hole, 3# represents the third tapping hole, and 4# represents the fourth tapping hole. Closed means the valve is closed, that is, the passage controlled by the valve is cut off; Open means the valve is opened, that is, the passage controlled by the valve is conducted.

[0118] In summary, the dust removal system provided by this application meets the dust removal requirements under the double tapping hole tapping condition and single tapping hole tapping condition of the four-tapping-hole blast furnace equipment by setting two dust removal units, four dust removal inlets, and valve components that can conduct and cut off the passages between each dust removal inlet and each dust removal unit. And, under these working conditions, the two dust removal units can operate independently without being in parallel by reasonably selecting which passages to conduct and cut off, thus avoiding the problem of high system energy consumption caused by parallel connection, and thus achieving a good dust removal effect with lower energy consumption. Further, when the valve component module is provided with a sixth valve and a seventh valve, the dust removal system can also meet the dust removal requirements under the fault repair condition of the four-tapping-hole blast furnace equipment.

[0119] The following is an illustration of each working condition with reference to the accompanying drawings:

[0120] As Figure 2 shown, in the single tapping hole dust removal mode, the operation process of the dust removal system when tapping from the first tapping hole: Tapping from the first tapping hole, and no tapping from other tapping holes; The flue gas from the first tapping hole is transmitted to the first dust removal unit 311 through the sixth valve 26 and the second valve 22 in sequence; That is, the pipeline between the first dust removal inlet 11 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the fourth dust removal inlet 14 and the second dust removal inlet 12 are flue gas-free pipelines; The pipeline between the third tapping hole and the second dust removal unit 312 is a low-speed flue gas pipeline. It should be noted that the motor of the large fan has a large electric power, and the starting and stopping process has a large impact on the power grid. To reduce the impact on the power grid, when the fan exits the working state, the electric power is reduced by reducing the frequency and speed, while saving energy and reducing consumption and avoiding frequent starting and stopping from impacting the power grid. Since the fan is not completely shut down during low-speed operation, the corresponding dust removal pipeline still needs to be conducted to form a low-speed flue gas pipeline. If all the corresponding pipelines are cut off during the low-speed operation of the fan, the negative pressure value at the dust collector is too large, which may cause the collapse of the box body. For the pipe sections that do not affect the penetration of the high-speed or low-speed fan pipelines, they are cut off to form flue gas-free pipelines.

[0121] As Figure 3 shown, under the single tuyere dust removal mode, the operation process of the dust removal system when the second tuyere discharges iron: the second tuyere discharges iron while other tuyeres do not; the flue gas from the second tuyere is transmitted to the second dust removal unit 312 through the seventh valve 27 and the fourth valve 24 in sequence; that is, the pipeline between the second dust removal inlet 12 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the third dust removal inlet 13 and the second dust removal inlet 12 are flue gas-free pipelines; the pipeline between the fourth tuyere and the first dust removal unit 311 is a low-speed flue gas pipeline.

[0122] As Figure 4 shown, under the single tuyere dust removal mode, the operation process of the dust removal system when the third tuyere discharges iron: the third tuyere discharges iron while other tuyeres do not; the flue gas from the third tuyere is transmitted to the second dust removal unit 312 through the fifth valve 25; that is, the pipeline between the third dust removal inlet 13 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12 and the first dust removal inlet 11 are flue gas-free pipelines; the pipeline between the fourth tuyere and the first dust removal unit 311 is a low-speed flue gas pipeline.

[0123] As Figure 5 shown, under the single tuyere dust removal mode, the operation process of the dust removal system when the fourth tuyere discharges iron: the fourth tuyere discharges iron while other tuyeres do not; the flue gas from the fourth tuyere is transmitted to the first dust removal unit 311 through the first valve 21; that is, the pipeline between the fourth dust removal inlet 14 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the first dust removal inlet 11 and the second dust removal inlet 12 are flue gas-free pipelines; the pipeline between the third tuyere and the second dust removal unit 312 is a low-speed flue gas pipeline.

[0124] As Figure 6 shown, under the double tuyere dust removal mode, the operation process of the dust removal system when the first and second tuyeres discharge iron: the first and second tuyeres discharge iron while other tuyeres do not; the flue gas from the first tuyere is transmitted to the first dust removal unit 311 through the sixth valve 26 and the second valve 22 in sequence; the flue gas from the second tuyere is transmitted to the second dust removal unit 312 through the seventh valve 27 and the fourth valve 24 in sequence; that is, between the first dust removal inlet 11 and the first dust removal unit 311, and between the second dust removal inlet 12 and the second dust removal unit 312, are both high-speed flue gas pipelines, and the pipelines corresponding to the third dust removal inlet 13 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0125] As Figure 7As shown in the figure, under the double-tuyere dust removal mode, the operation process of the dust removal system when the first and third tuyeres are tapping: The first and third tuyeres are tapping, and the other tuyeres are not tapping; The flue gas from the first tuyere is sequentially transmitted to the first dust removal unit 311 through the sixth valve 26 and the second valve 22; The flue gas from the third tuyere is transmitted to the second dust removal unit 312 through the fifth valve 25; That is, between the first dust removal inlet 11 and the first dust removal unit 311, and between the third dust removal inlet 13 and the second dust removal unit 312, are high-speed flue gas pipelines, and the pipelines corresponding to the second dust removal inlet 12 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0126] As Figure 8 shown in the figure, under the double-tuyere dust removal mode, the operation process of the dust removal system when the second and third tuyeres are tapping: The second and third tuyeres are tapping, and the other tuyeres are not tapping; The flue gas from the second tuyere is sequentially transmitted to the first dust removal unit 311 through the seventh valve 27, the third valve 23 and the second valve 22; The flue gas from the third tuyere is transmitted to the second dust removal unit 312 through the fifth valve 25; That is, between the second dust removal inlet 12 and the first dust removal unit 311, and between the third dust removal inlet 13 and the second dust removal unit 312, are high-speed flue gas pipelines, and the pipelines corresponding to the first dust removal inlet 11 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0127] As Figure 9 shown in the figure, under the double-tuyere dust removal mode, the operation process of the dust removal system when the first and fourth tuyeres are tapping: The first and fourth tuyeres are tapping, and the other tuyeres are not tapping; The flue gas from the first tuyere is sequentially transmitted to the second dust removal unit 312 through the sixth valve 26, the third valve 23 and the fourth valve 24; The flue gas from the fourth tuyere is transmitted to the first dust removal unit 311 through the first valve 21; That is, between the fourth dust removal inlet 14 and the first dust removal unit 311, and between the first dust removal inlet 11 and the second dust removal unit 312, are high-speed flue gas pipelines, and the pipelines corresponding to the third dust removal inlet 13 and the second dust removal inlet 12 are flue gas-free pipelines.

[0128] As Figure 10 shown in the figure, under the double-tuyere dust removal mode, the operation process of the dust removal system when the second and fourth tuyeres are tapping: The second and fourth tuyeres are tapping, and the other tuyeres are not tapping; The flue gas from the fourth tuyere is transmitted to the first dust removal unit 311 through the first valve 21; The flue gas from the second tuyere is sequentially transmitted to the second dust removal unit 312 through the seventh valve 27 and the fourth valve 24; That is, between the fourth dust removal inlet 14 and the first dust removal unit 311, and between the second dust removal inlet 12 and the second dust removal unit 312, are high-speed flue gas pipelines, and the pipelines corresponding to the third dust removal inlet 13 and the first dust removal inlet 11 are flue gas-free pipelines.

[0129] As Figure 11As shown in the figure, in the double-tuyere dust removal mode, the operation process of the dust removal system when tapping from the third and fourth tuyeres: Tapping from the third and fourth tuyeres, and no tapping from other tuyeres; The flue gas from the fourth tuyere is transmitted to the first dust removal unit 311 through the first valve 21; The flue gas from the third tuyere is transmitted to the second dust removal unit 312 through the fifth valve 25; That is, between the fourth dust removal inlet 14 and the first dust removal unit 311, and between the third dust removal inlet 13 and the second dust removal unit 312, are high-speed flue gas pipelines, and the pipelines corresponding to the second dust removal inlet 12 and the first dust removal inlet 11 are flue gas-free pipelines.

[0130] As Figure 12 shown, in the failure mode of the first dust removal unit 311, the operation process of the dust removal system when tapping from the first tuyere: Tapping from the first tuyere, and no tapping from other tuyeres; The flue gas from the first tuyere is sequentially transmitted to the second dust removal unit 312 through the sixth valve 26, the third valve 23 and the fourth valve 24; That is, between the first dust removal inlet 11 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12, the third dust removal inlet 13 and the fourth dust removal inlet 14 are flue gas-free pipelines. It should be noted that in the failure mode of the first dust removal unit 311, the inlet valve of the first dust removal fan is closed, and all the off-line lift valves of the first dust collector are closed.

[0131] As Figure 13 shown, in the failure mode of the first dust removal unit 311, the operation process of the dust removal system when tapping from the second tuyere: Tapping from the second tuyere, and no tapping from other tuyeres; The flue gas from the second tuyere is sequentially transmitted to the second dust removal unit 312 through the seventh valve 27 and the fourth valve 24; That is, between the second dust removal inlet 12 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the first dust removal inlet 11, the third dust removal inlet 13 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0132] As Figure 14 shown, in the failure mode of the first dust removal unit 311, the operation process of the dust removal system when tapping from the third tuyere: Tapping from the third tuyere, and no tapping from other tuyeres; The flue gas from the third tuyere is transmitted to the second dust removal unit 312 through the fifth valve 25; That is, between the third dust removal inlet 13 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12, the first dust removal inlet 11 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0133] As Figure 15As shown in the figure, the operation process of the dust removal system when the fourth tapping hole is tapping under the fault mode of the first dust removal unit 311: The fourth tapping hole is tapping, and the other tapping holes are not tapping; The flue gas from the fourth tapping hole is sequentially transmitted to the second dust removal unit 312 through the first valve 21, the second valve 22, the third valve 23 and the fourth valve 24; That is, the pipeline between the fourth dust removal inlet 14 and the second dust removal unit 312 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12, the third dust removal inlet 13 and the first dust removal inlet 11 are flue gas-free pipelines.

[0134] As Figure 16 shown in the figure, the operation process of the dust removal system when the first tapping hole is tapping under the fault mode of the second dust removal unit 312: The first tapping hole is tapping, and the other tapping holes are not tapping; The flue gas from the first tapping hole is sequentially transmitted to the first dust removal unit 311 through the sixth valve 26 and the second valve 22; That is, the pipeline between the first dust removal inlet 11 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12, the third dust removal inlet 13 and the fourth dust removal inlet 14 are flue gas-free pipelines. It should be noted that under the fault mode of the second dust removal unit 312, the inlet valve of the second dust removal fan is closed, and all the off-line lift valves of the second dust collector are closed.

[0135] As Figure 17 shown in the figure, the operation process of the dust removal system when the second tapping hole is tapping under the fault mode of the second dust removal unit 312: The first tapping hole is tapping, and the other tapping holes are not tapping; The flue gas from the second tapping hole is sequentially transmitted to the first dust removal unit 311 through the seventh valve 27, the third valve 23 and the second valve 22; That is, the pipeline between the second dust removal inlet 12 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the first dust removal inlet 11, the third dust removal inlet 13 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0136] As Figure 18 shown in the figure, the operation process of the dust removal system when the third tapping hole is tapping under the fault mode of the second dust removal unit 312: The third tapping hole is tapping, and the other tapping holes are not tapping; The flue gas from the third tapping hole is sequentially transmitted to the first dust removal unit 311 through the fifth valve 25, the fourth valve 24, the third valve 23 and the second valve 22; That is, the pipeline between the first dust removal inlet 11 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust removal inlet 12, the first dust removal inlet 11 and the fourth dust removal inlet 14 are flue gas-free pipelines.

[0137] As Figure 19As shown, in the failure mode of the second dust removal unit 312, the operation process of the dust removal system during tapping from the fourth tapping hole: Tapping occurs from the fourth tapping hole while no tapping occurs from other tapping holes; the flue gas from the fourth tapping hole is transmitted to the first dust removal unit 311 through the first valve 21; that is, the pipeline between the fourth dust inlet 14 and the first dust removal unit 311 is a high-speed flue gas pipeline, and the pipelines corresponding to the second dust inlet 12, the third dust inlet 13, and the first dust inlet 11 are flue gas-free pipelines.

[0138] Optionally, the dust removal unit includes a dust collector 31, a fan 32, and an exhaust stack 34.

[0139] The dust collector 31 is used to capture and remove dust particles in the flue gas. Common types of dust collectors 31 include electrostatic precipitators 31, bag filters 31, and wet scrubbers 31, etc.

[0140] The dust collector 31 can be a pulse bag filter 31. The pulse bag filter 31 uses compressed gas as the dust cleaning power, and uses the compressed gas released instantaneously by the pulse injection mechanism to induce several times of secondary gas to shoot into the filter bag at high speed, causing the filter bag to expand sharply, and relying on impact vibration and reverse air flow to clean the dust.

[0141] The dust collector 31 has an on-line maintenance function, that is, each chamber of the dust collector 31 is provided with an independent off-line maintenance valve. When an individual chamber is under off-line maintenance, it does not affect the normal operation of other chambers. When the off-line maintenance valves of all chambers are closed, the entire dust collector 31 can be cut off.

[0142] The dust collector 31 can be provided with a dust bin and a sending tank. The intercepted dust enters the dust bin and is then transported to the sintering batching tank through the sending tank.

[0143] The fan 32 is used to extract the dust-containing gas from the blast furnace and transport it to the dust collector 31 for treatment. The selection of the fan 32 needs to consider factors such as the gas flow rate, pressure, and temperature.

[0144] The exhaust stack 34 is used to discharge the cleaned gas after dust removal treatment. The design of the exhaust stack 34 needs to meet environmental protection standards to ensure that the discharged gas reaches the specified emission concentration.

[0145] Optionally, the dust removal unit further includes a silencer 33.

[0146] In some cases, the operation of the blast furnace will generate relatively large noise, so it may be necessary to install a silencer 33 to reduce noise pollution. The silencer 33 can effectively reduce the noise generated by the fan 32 and the exhaust system.

[0147] The features described in the various embodiments in this specification may be replaced or combined with each other. For the parts that are the same or similar among the embodiments, reference may be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for a system or a system embodiment, since it is basically similar to a method embodiment, the description is relatively simple. For the relevant parts, reference may be made to the partial description of the method embodiment. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative work.

[0148] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0149] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dust removal system for a four-taphole blast furnace, characterized in that: include: Valve assembly module, two dust removal units, four dust removal inlets; The first iron outlet of the blast furnace equipment is connected to the first dust removal inlet; The second iron outlet of the blast furnace equipment is connected to the second dust removal inlet; The third iron outlet of the blast furnace equipment is connected to the third dust removal inlet; The fourth iron outlet of the blast furnace equipment is connected to the fourth dust removal inlet; Each of the dust removal inlets is connected to the two dust removal units through the valve assembly module, and the valve assembly module includes multiple valves; when the valve is in different working states, the passage between the corresponding dust removal inlet and the corresponding dust removal unit is cut off or connected; the valves arranged on the passage between the two dust removal units and the same dust removal inlet are different.

2. The dust removal system for a four-tap hole blast furnace according to claim 1, characterized in that: At least one valve is arranged on the passage between each dust removal inlet and each dust removal unit.

3. The dust removal system for a four-taphole blast furnace according to claim 2, characterized in that: The valve assembly module includes: a first valve, a second valve, a third valve, a fourth valve and a fifth valve; The first end of the first valve is connected to the fourth dust removal inlet; The second end of the first valve is respectively connected to the first end of the second valve and the first dust removal unit; The second end of the second valve is communicated with the first dust removal inlet and the first end of the third valve respectively; The second end of the third valve is communicated with the second dust removal inlet and the first end of the fourth valve respectively; The second end of the fourth valve is communicated with the second dust removal unit and the second end of the fifth valve respectively; The first end of the fifth valve is communicated with the third dust removal inlet.

4. The dust removal system for a four-taphole blast furnace according to claim 3, characterized in that: The valve assembly module also includes a sixth valve; The sixth valve is disposed between a common point of the second valve and the third valve and the first dust removal inlet.

5. The dust removal system for a four-taphole blast furnace according to claim 3, characterized in that: The valve assembly mold further includes: a seventh valve; The seventh valve is disposed between a common point of the third valve and the fourth valve and the second dust removal inlet.

6. The dust removal system for a four-tap hole blast furnace according to any one of claims 1 to 5, characterized in that: The dust removal unit comprises a dust collector, a fan and an exhaust pipe.

7. The dust removal system for a four-taphole blast furnace according to claim 6, characterized in that: The dust removal unit further includes a muffler.

8. The dust removal system for a four-taphole blast furnace according to claim 6, characterized in that: The dust collector is a pulse bag dust collector.

9. The dust removal system for a four-tap hole blast furnace according to any one of claims 1 to 5, characterized in that: Each valve can be remotely controlled.

10. The dust removal system for a four-taphole blast furnace according to claim 9, characterized in that: The remotely controllable valve includes an electric valve or a pneumatic valve.

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