A device and system for actively swirling the raceway of a blast furnace tuyere

Abstract

This application relates to a device and system for activating the blast furnace tuyeres swirling zone, belonging to the technical field of blast furnace ironmaking equipment. It includes an oxygen supply loop pipe, an oxygen supply branch pipe, a pulse box, a pulse pipeline, a pulse lance, and an equipment control system. One end of the oxygen supply branch pipe is connected to the oxygen supply loop pipe, and the other end is connected to the inlet end of the pulse box. The pulse box is the core device for pulse generation, internally equipped with pulse generation components and a proprietary valve for high-speed opening and closing. One end of the pulse pipeline is sealed to the output end of the pulse box, and the other end is sealed to the pulse lance. The pulse lance is adapted to be inserted into the blast furnace tuyeres assembly. The equipment control system is electrically connected to the pulse box and used to regulate the pulse generation frequency and pulse pressure. This application effectively eliminates residual carbon accumulation in the blast furnace tuyeres swirling zone and the lower part of the furnace, optimizes the flow field distribution inside the furnace, and improves the blast furnace smelting efficiency and furnace condition stability.

Description

Technical Field

[0001] This application relates to the technical field of blast furnace ironmaking equipment, and in particular to a device and system for activating the blast furnace tuyeres swirling zone. Background Technology

[0002] At present, blast furnace ironmaking is the core basic process of steel production. As a key reaction area in blast furnace smelting, the combustion and reduction reaction state inside the tuyeres directly affects the distribution of gas flow, material flow and heat flow in the furnace, and is also the core factor that determines the blast furnace production efficiency, energy utilization rate and furnace condition stability.

[0003] In existing technologies, oxygen-enriched blast furnace smelting mainly adopts the conventional form of hot blast oxygen enrichment. Some technologies are supplemented with simple tuyeres oxygen enrichment structures. All of these methods involve mixing oxygen into the hot blast at a fixed flow rate or injecting it directly into the blast furnace from the tuyeres. This increases the oxygen concentration inside the blast furnace, promotes the combustion reaction of pulverized coal, and to a certain extent increases the proportion of pulverized coal in the furnace charge. This allows for the partial substitution of coke by the injected material, thereby achieving the basic effect of reducing the coke ratio of the furnace charge.

[0004] The core technical problem with the existing technologies is that the fixed flow rate oxygen enrichment method used in the existing blast furnace oxygen-enriched pulverized coal injection technology has insufficient impact depth and disturbance capability of the oxygen flow. It cannot effectively force disturbance to the tuyeres swirling zone and the lower part of the furnace, which easily causes residual carbon to accumulate and block the gas passage. This leads to uneven distribution of gas flow, material flow and heat flow in the blast furnace, ultimately reducing the smelting efficiency and furnace stability of the blast furnace. Summary of the Invention

[0005] In order to effectively eliminate residual carbon accumulation in the blast furnace tuyeres and the lower part of the furnace, optimize the flow field distribution inside the furnace, and improve the blast furnace smelting efficiency and furnace condition stability, this application provides a device and system for activating the blast furnace tuyeres.

[0006] The device for activating the blast furnace tuyere swirl zone provided in this application adopts the following technical solution: A device for activating the blast furnace tuyeres swirl zone includes an oxygen supply loop, an oxygen supply branch pipe, a pulse box, a pulse pipeline, a pulse lance, and an equipment control system. The oxygen supply loop is arranged around the outer wall of the furnace body. One end of the oxygen supply branch pipe is connected to the oxygen supply loop, and the other end is connected to the inlet end of the pulse box. The pulse box is the core device for pulse generation, and is equipped with a pulse generation component and a proprietary valve for high-speed opening and closing. One end of the pulse pipeline is sealed to the output end of the pulse box, and the other end is sealed to the pulse lance. The pulse lance is adapted to be inserted into the blast furnace tuyeres assembly. The equipment control system is electrically connected to the pulse box and is used to regulate the pulse generation frequency and pulse pressure. The pulse lance can continuously supply a base load oxygen flow to achieve self-cooling. The pulse box generates a high-pressure pulse and superimposes it onto the base load oxygen flow. Through the rapid opening and closing of the proprietary valve, a high-energy supersonic shock wave is formed and delivered to the blast furnace tuyeres swirl zone to forcibly disturb residual carbon and optimize the flow field inside the furnace.

[0007] By adopting the above technical solution, the oxygen supply ring pipe is arranged in a ring along the outer wall of the furnace body, which can realize uniform oxygen supply to multiple pulse boxes and ensure the consistency of pulse oxygen enrichment supply at each tuyer. The pulse box, as the core pulse generating device, superimposes the high-pressure pulse onto the basic load oxygen flow to form a high-energy supersonic shock wave, which is accurately delivered to the tuyer swirl zone to forcibly disturb the accumulation of residual carbon, solve the problem of insufficient disturbance capacity of existing fixed flow oxygen enrichment, optimize the flow field distribution in the furnace, and improve the blast furnace smelting efficiency and furnace condition stability.

[0008] Optionally, the proprietary valve is an electromagnetic on / off valve.

[0009] By adopting the above technical solutions, the electromagnetic high-speed opening and closing valve has a millisecond-level opening and closing response speed, which can accurately control the generation frequency and release timing of pulses, ensure the stable output of high-energy shock waves, improve the controllability and adjustability of disturbance effects, adapt to the needs of different blast furnace production conditions, and further enhance the ability to disturb and eliminate residual carbon in the tuyeres swirling zone.

[0010] This application also provides a system for an active blast furnace tuyere swirl zone, which adopts the following technical solution: The device includes an active blast furnace tuyeres recirculation zone, and also includes a furnace body, a hot blast duct, an air inlet device, and tuyeres assemblies. The hot blast duct and the oxygen supply ring are coaxially arranged around the outer wall of the furnace body. The air inlet device includes a gooseneck pipe and a straight-blowing pipe. One end of the gooseneck pipe is connected to the hot blast duct, and the other end is connected to the straight-blowing pipe. One end of the straight-blowing pipe is inserted into the tuyeres assembly. Multiple tuyeres assemblies are provided and are distributed in a circumferential shape along the lower part of the furnace body, with adjacent tuyeres assemblies spaced apart.

[0011] By adopting the above technical solution, the hot blast duct provides basic high-temperature hot blast to the blast furnace, forming a three-stream confluence structure with the pulverized coal injection lance and pulse injection lance inside the duct. The high-temperature hot blast, pulverized coal flow and pulse oxygen-enriched flow are efficiently mixed in the tuyeres swirling zone, enhancing pulverized coal combustion and residual carbon disturbance. The circumferential distribution of multiple tuyeres components can ensure the uniformity of air supply and oxygen enrichment in all areas of the furnace, avoid flow field segregation in the furnace, further improve furnace stability, and adapt to the production needs of large-scale blast furnaces and multiple tuyeres.

[0012] Optionally, the air outlet assembly includes a large sleeve, a medium sleeve, and a small sleeve. One end of the medium sleeve is inserted into the large sleeve and fixedly connected to the inner wall of the large sleeve, and the other end is wrapped around the outside of one end of the small sleeve and fixedly connected to the outer wall of the small sleeve. All three sleeves are tubular and constricted in the direction of penetration into the furnace body.

[0013] By adopting the above technical solutions, the constriction design can increase the airflow ejection speed, enhance the turbulent mixing effect of pulsed oxygen-enriched flow with pulverized coal flow and hot air, further strengthen the impact and disturbance ability on the tuyere swirl zone, improve the pulverized coal combustion efficiency and residual carbon removal effect, and at the same time, the constriction structure can guide the airflow to accurately point to the core area of ​​the swirl zone, improve the utilization efficiency of oxygen and pulverized coal, and reduce the coke ratio of the furnace charge.

[0014] Optionally, the small sleeve is provided with a pulse airflow channel, which is located within the wall thickness of the small sleeve itself. One end of the pulse airflow channel is opened into the middle sleeve for connection with the pulse spray gun, and the other end is opened through the end face of the small sleeve facing the center of the furnace body; a diameter reduction section is provided at the end of the pulse airflow channel.

[0015] By adopting the above technical solution, the pulse airflow channel is embedded inside the small sleeve wall thickness, without occupying the mainstream channel space of the tuyeres assembly. This avoids interference with the normal delivery of high-temperature hot air and pulverized coal flow, ensuring the stability of the blast furnace foundation air supply and pulverized coal injection conditions. The channel is directly connected to the pulse spray gun, resulting in a short airflow transmission path and low pressure loss. The end diameter reduction section can further reduce the airflow cross-section and increase the injection speed, allowing the high-energy pulse shock wave to act more accurately and powerfully on the core area of ​​the tuyeres swirl zone, enhancing the residual carbon disturbance and flow field optimization effect.

[0016] Optionally, a nitrogen supply loop pipe and a nitrogen supply branch pipe are provided between the furnace body and the pulse box. The nitrogen supply loop pipe and the oxygen supply loop pipe are coaxially wrapped around the outer wall of the furnace body. The nitrogen supply loop pipe is connected to the pulse box through the nitrogen supply branch pipe and is used to introduce nitrogen gas to achieve safety protection when the equipment fails or is under maintenance.

[0017] By adopting the above technical solution, the nitrogen supply loop pipe is used as a safety pipeline. In the event of equipment failure, maintenance or emergency shutdown, nitrogen can be quickly introduced into the pulse box, pulse pipeline and pulse spray gun to purge the inside of the cooling device, prevent high temperature burn-out or oxygen leakage, improve the safety of equipment operation and the convenience of maintenance, and at the same time avoid pipeline deformation or sealing failure caused by high temperature environment, thus extending the overall service life of the device.

[0018] Optionally, a bottom horizontal support is provided on the outer wall of the furnace body. The bottom horizontal support includes a base, a connecting rod, and a support member. The base is fixed to the outer wall of the furnace body. One end of the connecting rod is hinged to the base with the hinge axis set in the horizontal direction. The other end of the connecting rod is hinged to one end of the support member with the hinge axis set in the vertical direction. The end of the support member away from the connecting rod is cantilevered. A bracket is fixed to the outer wall of the direct blowing pipe. A slot is opened at the bottom end of the bracket, and the slot is inserted into the support member.

[0019] By adopting the above technical solution, the hinged structure of the bottom horizontal support can flexibly adjust the horizontal position and angle of the direct blowing pipe, and the insertion and matching of the slot and the support can realize the quick disassembly and positioning of the direct blowing pipe, ensuring the airflow mixing effect.

[0020] Optionally, the support member is threadedly connected with an adjusting cap, which is slidably disposed along the length of the support member, and the end face of the adjusting cap facing the furnace body abuts against the side wall of the bracket away from the furnace body.

[0021] By adopting the above technical solution, the adjusting cap can be flexibly adjusted and positioned along the length of the support and self-locked by the thread. After tightening, it tightly abuts against the bracket on the outer wall of the direct blowing pipe, which can firmly lock the installation position and posture of the direct blowing pipe, prevent the pipeline from shifting due to equipment vibration and thermal expansion displacement during blast furnace production, and ensure that the pulse spray gun, pulverized coal spray gun and tuyeres always maintain precise alignment, ensuring stable and reliable airflow mixing and spraying effect.

[0022] Optionally, a top adjustment bracket is provided on the outer wall of the furnace body. The top adjustment bracket includes a top seat and a telescopic rod. The top seat is fixed on the outer wall of the furnace body. One end of the telescopic rod is hinged to the top seat with the hinge axis set in the horizontal direction. The other end of the telescopic rod is hinged to the outer wall of the gooseneck tube with the hinge axis set in the horizontal direction. Two top adjustment brackets are provided and are arranged vertically and intermittently in the same vertical plane.

[0023] By adopting the above technical solution, the top adjustment brackets distributed vertically can flexibly adjust the position and angle of the gooseneck tube through the telescopic movement of the telescopic rod, adapting to the pipeline stress compensation requirements of hot air delivery under different working conditions, avoiding pipeline breakage or leakage caused by thermal expansion and contraction or equipment vibration, and ensuring the reliable operation of the blast furnace air supply system.

[0024] Optionally, the direct-blowing pipe includes a side interface for connecting a pulverized coal injection gun.

[0025] By adopting the above technical solution, the side interface provides an independent and dedicated installation connection position for the pulverized coal injection gun, which allows the pulverized coal flow, high-temperature hot air, and pulsed oxygen-enriched flow to converge and mix fully in advance inside the direct-blowing pipe, forming a uniform gas-solid mixed airflow. This significantly improves the combustion speed and completeness of pulverized coal in the tuyeres' swirling zone. Combined with the disturbance effect of the pulsed shock wave, it further reduces residual carbon generation and optimizes the reaction environment inside the furnace.

[0026] In summary, this application includes at least one of the following beneficial technical effects: Optimize the flow field inside the furnace, stabilize the furnace conditions and improve efficiency. The three airflows of hot air, pulverized coal and pulse oxygen enrichment are efficiently mixed in the tuyeres, which uniformly improves the distribution of coal flow, material flow and heat flow inside the furnace, improves the air permeability and liquid permeability of the coke bed, ensures the long-term stable operation of the blast furnace, significantly improves smelting efficiency and reduces the coke ratio of the furnace charge. It efficiently disturbs residual carbon and clears gas passages. By superimposing high-pressure pulses with basic oxygen flow to form high-energy supersonic shock waves, it forcibly disturbs and ignites residual carbon in the tuyeres and the lower part of the furnace, eliminating residual carbon accumulation from the source and completely solving the problems of insufficient disturbance capacity and easy blockage of gas passages in traditional fixed-flow oxygen-enriched systems. It features a safe and adaptable structure, convenient maintenance, and long service life. The matching nitrogen supply safety system can provide purging protection during faults and maintenance. The adjustable support system can adapt to thermal expansion displacement and precise installation positioning. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a partial structural diagram of the air intake device; Figure 3 This is an exploded view of the partial structure where the card slot is located; Figure 4 This is a schematic diagram of the constricted shape of the air vent assembly; Figure 5 This is a cross-sectional view of the air vent assembly.

[0028] In the diagram, 1. Oxygen supply loop pipe; 11. Oxygen supply branch pipe; 2. Pulse box; 21. Pulse pipeline; 3. Air inlet device; 31. Gooseneck pipe; 32. Direct blow pipe; 321. Side interface; 4. Furnace body; 41. Support; 42. Slot; 5. Hot air surround pipe; 6. Air outlet assembly; 61. Large sleeve; 62. Medium sleeve; 63. Small sleeve; 631. Pulse airflow channel; 632. Reduction section; 7. Nitrogen supply loop pipe; 71. Nitrogen supply branch pipe; 8. Bottom horizontal support; 81. Base; 82. Connecting rod; 83. Support component; 84. Adjusting cap; 9. Top adjusting support; 91. Top seat; 92. Telescopic rod. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0030] This application discloses a device for activating the blast furnace tuyeres swirling zone.

[0031] refer to Figure 1 and Figure 2 A device for activating the blast furnace tuyeres swirl zone includes an oxygen supply loop 1, an oxygen supply branch pipe 11, a pulse box 2, a pulse pipeline 21, a pulse lance, and an equipment control system. The oxygen supply loop 1 is arranged around the outer wall of the furnace body 4. One end of the oxygen supply branch pipe 11 is connected to the oxygen supply loop 1, and the other end is connected to the inlet end of the pulse box 2. The pulse box 2 serves as the core device for pulse generation, and its interior is equipped with a pulse generation component and a proprietary valve that opens and closes at high speed. The proprietary valve is an electromagnetic valve. One end of the pulse pipeline 21 is connected to the pulse... The output end of the pulse box 2 is sealed and connected, while the other end is sealed and connected to the pulse spray gun. The pulse spray gun is fitted and inserted inside the tuyer assembly 6 of the blast furnace. The equipment control system is electrically connected to the pulse box 2 to regulate the pulse generation frequency and pulse pressure. The pulse spray gun can continuously supply the basic load oxygen flow to achieve its own cooling. The high-pressure pulse generated by the pulse box 2 is superimposed on the basic load oxygen flow and rapidly opened and closed by a dedicated valve to form a high-energy supersonic shock wave, which is delivered to the blast furnace tuyeres swirling zone to forcibly disturb residual carbon and optimize the flow field inside the furnace. In this embodiment, the electromagnetic opening and closing valve and the pulse generation assembly are technologies known to those skilled in the art and are not shown in the figure.

[0032] This application also discloses a system for activating the blast furnace tuyeres vortex zone.

[0033] refer to Figures 1 to 4 A system for an active blast furnace tuyeres recirculation zone includes the device for an active blast furnace tuyeres recirculation zone as described above, and also includes a furnace body 4, a hot blast duct 5, an air inlet device 3, and a tuyeres assembly 6. The hot blast duct 5 is coaxially wrapped around the outer wall of the furnace body 4 with the oxygen supply ring pipe 1. The air inlet device 3 includes a gooseneck pipe 31 and a straight-blowing pipe 32. One end of the gooseneck pipe 31 is connected to the hot blast duct 5, and the other end is connected to the straight-blowing pipe 32. One end of the straight-blowing pipe 32 is inserted into the tuyeres assembly 6.

[0034] refer to Figure 1 , Figure 4 and Figure 5Multiple air vent assemblies 6 are provided, and the multiple air vent assemblies 6 are evenly distributed in a circular shape along the lower part of the furnace body 4. Adjacent air vent assemblies 6 are spaced apart. The air vent assembly 6 includes a large sleeve 61, a middle sleeve 62 and a small sleeve 63. One end of the middle sleeve 62 is inserted into the large sleeve 61 and fixedly connected to the inner wall of the large sleeve 61. The other end is wrapped around the outside of one end of the small sleeve 63 and fixedly connected to the outer wall of the small sleeve 63. The large sleeve 61, the middle sleeve 62 and the small sleeve 63 are all tubular structures and are all set in a constricted shape along the direction of penetrating into the furnace body 4. A pulse airflow channel 631 is opened on the small sleeve 63. The pulse airflow channel 631 is located inside the wall thickness of the small sleeve 63. One end of the pulse airflow channel 631 is opened into the middle sleeve 62 for connection with the pulse spray gun. The other end penetrates the end face of the small sleeve 63 facing the center of the furnace body 4. A constricted section 632 is provided at the end of the pulse airflow channel 631.

[0035] refer to Figure 1 A nitrogen supply loop pipe 7 and a nitrogen supply branch pipe 71 are provided between the furnace body 4 and the pulse box 2. The nitrogen supply loop pipe 7 and the oxygen supply loop pipe 1 are coaxially wrapped around the outer wall of the furnace body 4. The nitrogen supply loop pipe 7 is connected to the pulse box 2 through the nitrogen supply branch pipe 71, and is used to introduce nitrogen gas to achieve safety protection when the equipment fails or is under maintenance.

[0036] refer to Figure 1 , Figure 2 and Figure 3 A bottom horizontal support 8 is provided on the outer wall of the furnace body 4. The bottom horizontal support 8 includes a base 81, a connecting rod 82, and a support member 83. The base 81 is fixedly installed on the outer wall of the furnace body 4. One end of the connecting rod 82 is hinged to the base 81 with the hinge axis set in the horizontal direction. The other end of the connecting rod 82 is hinged to one end of the support member 83 with the hinge axis set in the vertical direction. The end of the support member 83 away from the connecting rod 82 is cantilevered. A bracket 41 is fixed on the outer wall of the direct blow pipe 32. A slot 42 is opened at the bottom end of the bracket 41. The slot 42 is inserted into the support member 83. An adjusting cap 84 is threadedly connected to the support member 83. The adjusting cap 84 can slide along the length direction of the support member 83. The end face of the adjusting cap 84 facing the furnace body 4 abuts against the side wall of the bracket 41 away from the furnace body 4.

[0037] refer to Figure 1 and Figure 2A top adjustment bracket 9 is also provided on the outer wall of the furnace body 4. The top adjustment bracket 9 includes a top seat 91 and a telescopic rod 92. The top seat 91 is fixedly installed on the outer wall of the furnace body 4. One end of the telescopic rod 92 is hinged to the top seat 91 with the hinge axis set in the horizontal direction. The other end of the telescopic rod 92 is hinged to the outer wall of the gooseneck tube 31 with the hinge axis set in the horizontal direction. There are two top adjustment brackets 9, which are arranged vertically and alternately in the same vertical plane. A side interface 321 is provided on the straight blowing pipe 32, which is used to connect the pulverized coal spray gun. In this embodiment, the oxygen supply ring pipe 1, pulse box 2, nitrogen supply ring pipe 7 and hot air surrounding pipe 5 are installed outside the furnace body 4 using conventional fixing methods in the art. The external stable oxygen supply, nitrogen supply and hot air supply equipment and connecting pipelines are common knowledge in the field of blast furnace ironmaking. The pulse spray gun and pulverized coal spray gun adopt conventional high-temperature resistant spray gun structures in the art, and their specific structures are not described in detail here.

[0038] The implementation principle of the system for activating the blast furnace tuyeres swirling zone in this application embodiment is as follows: During normal production, the oxygen supply loop 1 supplies stable oxygen to the pulse box 2 through the oxygen supply branch pipe 11. Part of the oxygen is continuously supplied to the pulse lance as a base load to achieve self-cooling of the pulse lance and avoid burn-out of the lance due to the high temperature environment of the blast furnace. The equipment control system precisely controls the pulse generation frequency and pulse pressure of the pulse box 2 according to the actual smelting conditions of the blast furnace. The electromagnetic valve inside the pulse box 2 opens and closes at high speed, superimposing the high-pressure pulse onto the base load oxygen flow to form a high-energy supersonic shock wave. The shock wave is transported to the pulse lance through the pulse pipeline 21, and then through the pulse in the small sleeve 63. After being accelerated by the airflow channel 631 and the end narrowing section 632, the airflow is injected into the tuyeres swirling zone of the furnace body 4. At the same time, the high-temperature hot air in the hot air casing 5 is transported to the direct blowing pipe 32 through the gooseneck pipe 31. The pulverized coal injection gun injects pulverized coal into the direct blowing pipe 32 through the side interface 321 of the direct blowing pipe 32. The high-temperature hot air and pulverized coal flow are fully mixed in the direct blowing pipe 32. After being further accelerated by the narrowing structure of the tuyeres assembly 6, the pulverized coal is injected into the blast furnace tuyeres swirling zone. The supersonic shock wave forcibly disturbs and ignites the residual carbon in the tuyeres swirling zone and the lower part of the furnace, eliminating the accumulation of residual carbon, clearing the gas passage, optimizing the distribution of gas flow, material flow and heat flow in the furnace, and improving the pulverized coal combustion efficiency and blast furnace smelting stability. When equipment malfunctions or requires maintenance, the oxygen supply system is shut off, and the nitrogen supply loop 7 is opened. Nitrogen gas enters the pulse box 2, pulse pipeline 21, and pulse spray gun through the nitrogen supply branch pipe 71 to purge and cool the inside of the device, preventing high-temperature burn-out or oxygen leakage, thus achieving safety protection. During installation and commissioning, the horizontal position and angle of the direct-blowing pipe 32 can be flexibly adjusted through the double-hinged structure of the bottom horizontal support 8. Tightening the adjusting cap 84 locks the position of the direct-blowing pipe 32, preventing pipeline displacement caused by equipment vibration or thermal expansion and contraction. The position and angle of the gooseneck pipe 31 can be adjusted by extending and retracting the telescopic rod 92 of the top adjusting support 9 to compensate for pipeline thermal expansion stress and vibration displacement, ensuring the stable operation of the hot air conveying system, ensuring precise alignment of the pulse spray gun, pulverized coal spray gun, and air outlet assembly 6, and maintaining stable airflow mixing and spraying effect.

[0039] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for activating the blast furnace tuyeres recirculation zone, characterized in that: The system includes an oxygen supply loop (1), an oxygen supply branch pipe (11), a pulse box (2), a pulse pipeline (21), a pulse spray gun, and an equipment control system. The oxygen supply loop (1) is arranged around the outer wall of the furnace body (4). One end of the oxygen supply branch pipe (11) is connected to the oxygen supply loop (1), and the other end is connected to the air inlet of the pulse box (2). The pulse box (2) is the core device for pulse generation, and is equipped with pulse generation components and a dedicated valve for high-speed opening and closing. One end of the pulse pipeline (21) is connected to the output end of the pulse box (2). The other end is sealed and connected to the pulse spray gun; the pulse spray gun is adapted to be inserted into the tuyer assembly (6) of the blast furnace; the equipment control system is electrically connected to the pulse box (2) to regulate the pulse generation frequency and pulse pressure; the pulse spray gun can continuously introduce the basic load oxygen flow to achieve self-cooling; the pulse box (2) generates high-pressure pulses and superimposes them on the basic load oxygen flow; through the dedicated valve, a high-energy supersonic shock wave is formed and transported to the blast furnace tuyer vortex zone to forcibly disturb the residual carbon and optimize the flow field inside the furnace.

2. The device for activating the blast furnace tuyeres swirl zone according to claim 1, characterized in that: The proprietary valve is an electromagnetic on / off valve.

3. A system for activating the blast furnace tuyeres recirculation zone, characterized in that: The device including the active blast furnace tuyeres swirling zone as described in claim 1 further includes a furnace body (4), a hot blast duct (5), an air inlet device (3), and a tuyeres assembly (6); the hot blast duct (5) and the oxygen supply ring pipe (1) are coaxially surrounding the outer wall of the furnace body (4); the air inlet device (3) includes a gooseneck pipe (31) and a straight blowing pipe (32), one end of the gooseneck pipe (31) is connected to the hot blast duct (5), and the other end is connected to the straight blowing pipe (32), and one end of the straight blowing pipe (32) is inserted into the tuyeres assembly (6); multiple tuyeres assemblies (6) are provided and are distributed in a circumferential shape along the lower part of the furnace body (4), with adjacent tuyeres assemblies (6) spaced apart.

4. The system for activating the blast furnace tuyeres recirculation zone according to claim 3, characterized in that: The air vent assembly (6) includes a large sleeve (61), a medium sleeve (62) and a small sleeve (63). One end of the medium sleeve (62) is inserted into the large sleeve (61) and fixedly connected to the inner wall of the large sleeve (61). The other end is wrapped around one end of the small sleeve (63) and fixedly connected to the outer wall of the small sleeve (63). The large sleeve (61), the medium sleeve (62) and the small sleeve (63) are all tubular and all have a constricted shape along the direction of penetrating into the furnace body (4).

5. The system for activating the blast furnace tuyeres recirculation zone according to claim 4, characterized in that: The small sleeve (63) is provided with a pulse airflow channel (631). The pulse airflow channel (631) is located within the wall thickness of the small sleeve (63). One end of the pulse airflow channel (631) is opened into the middle sleeve (62) for connection with the pulse spray gun, and the other end is opened through the end face of the small sleeve (63) facing the center of the furnace body (4). A diameter reduction section (632) is provided at the end of the pulse airflow channel (631).

6. The system for activating the blast furnace tuyeres recirculation zone according to claim 3, characterized in that: A nitrogen supply loop pipe (7) and a nitrogen supply branch pipe (71) are provided between the furnace body (4) and the pulse box (2). The nitrogen supply loop pipe (7) and the oxygen supply loop pipe (1) are coaxially wrapped around the outer wall of the furnace body (4). The nitrogen supply loop pipe (7) is connected to the pulse box (2) through the nitrogen supply branch pipe (71) and is used to introduce nitrogen gas to achieve safety protection when the equipment fails or is under maintenance.

7. The system for activating the blast furnace tuyeres recirculation zone according to claim 3, characterized in that: The furnace body (4) is provided with a bottom horizontal support (8) on its outer wall. The bottom horizontal support (8) includes a base (81), a connecting rod (82) and a support (83). The base (81) is fixed on the outer wall of the furnace body (4). One end of the connecting rod (82) is hinged to the base (81) and the hinge axis is set in the horizontal direction. The other end of the connecting rod (82) is hinged to one end of the support (83) and the hinge axis is set in the vertical direction. The end of the support (83) away from the connecting rod (82) is cantilevered. The outer wall of the direct blow pipe (32) is fixed with a bracket (41). The bottom end of the bracket (41) is provided with a slot (42) and the slot (42) is inserted into the support (83).

8. The system for activating the blast furnace tuyeres recirculation zone according to claim 7, characterized in that: An adjusting cap (84) is threaded onto the support member (83). The adjusting cap (84) is slidably disposed along the length of the support member (83). The end face of the adjusting cap (84) facing the furnace body (4) abuts against the side wall of the bracket away from the furnace body (4).

9. The system for activating the blast furnace tuyeres recirculation zone according to claim 3, characterized in that: The furnace body (4) is provided with a top adjustment bracket (9) on its outer wall. The top adjustment bracket (9) includes a top seat (91) and a telescopic rod (92). The top seat (91) is fixed on the outer wall of the furnace body (4). One end of the telescopic rod (92) is hinged to the top seat (91) and the hinge axis is set in the horizontal direction. The other end of the telescopic rod (92) is hinged to the outer wall of the gooseneck tube (31) and the hinge axis is set in the horizontal direction. There are two top adjustment brackets (9) and they are arranged in a vertically distributed manner with intervals in the same vertical plane.

10. The system for activating the blast furnace tuyeres recirculation zone according to claim 3, characterized in that: The straight-blowing pipe (32) includes a side port (321) for connecting a pulverized coal spray gun.

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