Device and method for improving blast furnace charge level detection precision

Abstract

The invention discloses a device and method for improving blast furnace charge level detection precision, and the device comprises a blast furnace top which is in a frustum shape and is provided with a top cavity and a feed opening communicating with the top cavity; the plurality of ascension pipes are arranged around the axis of the discharging opening at intervals, and the ascension pipes are used for discharging blast furnace gas; the thermal imaging piece is used for obtaining a charge level image or video of a blast furnace body, the thermal imaging piece is installed on the top of the blast furnace, and the thermal imaging piece and the ascending pipe are arranged in a staggered mode in the circumferential direction of the top of the blast furnace; the flow guide plate is located in the top cavity and is arranged in the circumferential direction of the blast furnace top, the thermal imaging piece and the flow guide plate are correspondingly arranged, and the ascending pipe, the flow guide plate, the thermal imaging piece and the discharging opening are sequentially arranged in the generatrix direction of the blast furnace top.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnaces, and specifically relates to a device and method for improving the detection accuracy of blast furnace charge levels. Background Art

[0002] Modern blast furnaces produce a large amount of flammable, high-temperature, high-pressure, and dusty byproduct—crude gas. This crude gas is drawn from the blast furnace's riser and initially undergoes gravity dust removal (30%-40% efficiency), followed by secondary dust removal in a cyclone (85%-90% efficiency), and finally undergoes dry bag dust removal, becoming clean, high-temperature, high-pressure gas. It then enters the TRT unit, where it expands and reduces pressure to recover electricity. The low-pressure gas, reduced to network pressure, is then fed into the company's gas network for use as fuel. The recovered blast furnace dust is then returned to the agglomeration plant as raw material for agglomerated ore.

[0003] The closed, high-temperature, high-pressure and dusty environment inside the blast furnace makes it extremely difficult to detect and measure the charge surface. Therefore, the accuracy of the blast furnace charge surface flatness, temperature and flame detection is not high. Summary of the Invention

[0004] In order to solve the current technical problem of low accuracy in blast furnace charge level detection, the present application provides a device and method for improving the accuracy of blast furnace charge level detection.

[0005] In a first aspect of the present application, there is provided a device for improving the detection accuracy of a blast furnace charge level, comprising:

[0006] A blast furnace roof, wherein the blast furnace roof is in a frustum shape and is provided with a top cavity and a discharge port connected to the top cavity;

[0007] There are multiple riser pipes, which are arranged around the axis of the discharge port at intervals, and are used to discharge blast furnace gas;

[0008] A thermal imaging element for acquiring an image or video of a blast furnace shaft charge surface, wherein the thermal imaging element is mounted on the blast furnace roof and staggered with respect to the riser along the circumference of the blast furnace roof;

[0009] The guide plate is located in the top cavity. The thermal imaging element is arranged corresponding to the guide plate along the circumference of the blast furnace top. The riser, the guide plate, the thermal imaging element and the discharge port are arranged in sequence along the busbar direction of the blast furnace top.

[0010] In some embodiments, the guide plate is provided with a first guide surface and a second guide surface arranged at an angle, the first guide surface is parallel to the axis of the blast furnace top, and the second guide surface is parallel to the axis of the riser.

[0011] In some embodiments, two thermal imaging elements and two guide plates are provided, the thermal imaging elements and the guide plates are provided in one-to-one correspondence, and the two thermal imaging elements are respectively located on both sides of the discharge port in a radial direction;

[0012] Both ends of the guide plate along the circumference of the blast furnace roof extend out of the corresponding thermal imaging component.

[0013] In some embodiments, the thermal imaging element is provided with a gas cooling channel, the inlet of the gas cooling channel is used to communicate with an external gas source, and the outlet of the gas cooling channel is located in the top cavity.

[0014] In some embodiments, the invention further comprises a material distribution chute located in the top cavity, wherein the material distribution chute comprises a material receiving end, a connecting section, and a material discharge end connected in sequence, wherein the material receiving end is rotatably connected to the body and corresponds to the position of the material discharge port;

[0015] The material distribution chute is provided with a cover plate covering the connecting section and the material discharge end.

[0016] In a second aspect of the present application, a method for improving the accuracy of blast furnace charge level detection is provided, which is implemented based on the device for blast furnace charge level detection accuracy of the first aspect, and is characterized in that the method comprises:

[0017] During the blast furnace smelting process, blast furnace gas rises from the blast furnace to the top chamber, and the gas pressure in the top chamber is controlled to 260Kpa~280Kpa to reduce the dust flow rate in the riser. The guide plate reduces the amount of upward dust to ensure the clarity of the pictures or videos output by the thermal imaging element.

[0018] In some embodiments, the method further comprises:

[0019] During the blast furnace smelting process, materials are fed through the discharge port, with the amount of materials fed each time being 115 to 125 tons.

[0020] In some embodiments, the method further comprises:

[0021] During the blast furnace smelting process, the blast furnace is blasted with air at a blast temperature of 1220°C to 1240°C.

[0022] In some embodiments, the blast pressure is 440 KPa to 460 KPa.

[0023] In some embodiments, the blast furnace blast is performed through a tuyere of the blast furnace, and the inner diameter of the tuyere is 120 mm to 130 mm.

[0024] According to an embodiment of the present application, a device for improving the detection accuracy of blast furnace material surface is provided, which includes a blast furnace roof, a riser, a thermal imaging element and a guide plate. The blast furnace roof is a frustum and is provided with a top cavity and a discharge port connected to the top cavity; there are multiple risers, and the multiple risers are arranged at intervals around the axis of the discharge port, and the risers are used to discharge blast furnace gas; the thermal imaging element is used to obtain an image or video of the blast furnace body material surface, and the thermal imaging element is installed on the blast furnace roof, and the thermal imaging element and the riser are staggered along the circumference of the blast furnace roof; the guide plate is located in the top cavity, and the thermal imaging element and the guide plate are arranged correspondingly along the circumference of the blast furnace roof, and the riser, the guide plate, the thermal imaging element and the discharge port are arranged in sequence along the busbar direction of the blast furnace roof. Generally speaking, there is a lot of dust in the air flow. The device provided in this application can guide the flow field of the coal gas flow due to the provision of a guide plate. There is no direct convection between the air flow and the thermal imaging element. There is less dust in front of the thermal imaging element, the clarity of the video is higher, and a clearer material surface and flame distribution can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a blast furnace taken along the axis of the thermal imaging element is shown.

[0026] Figure 2 A cross-sectional view of a blast furnace taken along the axis of an ascending tube is shown.

[0027] Figure 3 A top view of the furnace roof is shown.

[0028] Figure 4 The figure shows a schematic structural diagram of a thermal imaging element.

[0029] Description of reference numerals:

[0030] 10-blast furnace top, 11-top cavity, 12-discharging port; 20-blast furnace body; 30-rising pipe; 40-thermal imaging element, 41-gas cooling channel; 50-guide plate, 51-first guide surface, 52-second guide surface; 60-distribution chute, 70-material surface. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0032] The first embodiment of the present application provides a device for improving the detection accuracy of blast furnace material surface, which can reduce the amount of dust in the top cavity, improve the imaging quality of the thermal imaging element, and thus improve the detection accuracy of temperature, material surface flatness and flame.

[0033] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0034] See also Figure 1 、 Figure 2 as well as Figure 3 The device for improving the detection accuracy of the blast furnace charge surface 70 provided in the embodiment of the present application includes a blast furnace roof 10, a riser 30, a thermal imaging element 40, and a guide plate 50.

[0035] Generally speaking, a blast furnace is provided with a blast furnace roof 10 and a blast furnace body 20 arranged in sequence from top to bottom. The body contains a material column composed of ore, coke, etc. The blast furnace roof 10 is a frustum-shaped, small at the top and large at the bottom. The furnace roof is provided with a top cavity 11 and a discharge port 12 connected to the top cavity 11. Ore, coke, etc. can be distributed into the blast furnace through the discharge port 12.

[0036] Multiple riser tubes 30 are provided, spaced apart and arranged around the axis of the discharge port 12. These riser tubes 30 are used to discharge blast furnace gas. Ore reduction reactions occur within the blast furnace, producing blast furnace gas containing carbon monoxide. This gas gradually rises, escapes the charge column, and enters the top chamber 11. It is then discharged through the riser tubes 30 for subsequent dust removal and recovery processes.

[0037] The thermal imaging element 40 can be a thermal imager or thermal imaging device that can capture images or videos of the charge surface 70 of the blast furnace shaft 20. Generally, the thermal imager can capture real-time video of the charge surface 70, allowing direct observation of the charge surface 70's flatness, flame distribution, and temperature. Based on the flame distribution, the gas flow distribution and temperature at various locations on the charge surface 70 can be inferred. The gas flow distribution, temperature, and charge surface 70 flatness can then be used to guide charge placement. The thermal imaging element 40 is mounted on the blast furnace roof 10, conveniently capturing the charge surface 70 below. Along the circumference of the blast furnace roof 10, the thermal imaging element 40 and the riser 30 are staggered. The coal gas in the material column will be discharged through the riser 30 after rising. The riser 30 and the thermal imaging element 40 are staggered along the circumference. The airflow will reduce the erosion of the thermal imaging element 40 and increase the service life of the thermal imaging element 40. Generally speaking, there is more dust in the airflow, and there is no direct convection between the airflow and the thermal imaging element 40. There is less dust in front of the thermal imaging element 40, the clarity of the video is higher, and a clearer material surface 70 and flame distribution can be obtained.

[0038] The guide plate 50 is located within the top cavity 11 and guides the gas flow field within the top cavity 11. The thermal imaging element 40 is positioned corresponding to the guide plate 50 along the circumference of the blast furnace roof 10. This allows the airflow to be guided by the guide plate as it moves upward, reducing erosion of the thermal imaging element 40. There is no direct convection between the airflow and the thermal imaging element 40, resulting in less dust in front of the thermal imaging element 40, higher-definition video, and a clearer view of the material surface 70 and flame distribution. The riser 30, guide plate 50, thermal imaging element 40, and discharge port 12 are positioned sequentially along the busbar of the blast furnace roof 10.

[0039] The present application sets a thermal imaging element 40 to obtain real-time pictures or videos of the material surface 70, sets a flow guide, improves the gas flow field in the top cavity 11, reduces the erosion of the air flow on the thermal imaging element 40, reduces the dust concentration in front of the thermal imaging element 40, and improves the clarity of the picture or video, so as to accurately obtain the flatness, temperature and flame distribution of the material surface 70.

[0040] The thermal imaging element 40 utilizes an infrared detector and an optical imaging lens to detect the infrared radiation energy distribution pattern on the material surface 70. This pattern is reflected on the infrared detector's photosensitive element, thereby producing an infrared thermal image or video. This thermal image or video corresponds to the thermal distribution field of the material surface 70. Simply put, varying temperatures on the material surface 70 result in different infrared radiation intensities being emitted to the outside world. The thermal imaging element 40 captures this infrared radiation to create an image.

[0041] The thermal imaging element 40 may be provided with a gas cooling channel 41. The inlet of the gas cooling channel 41 is connected to an external air source, and the outlet of the gas cooling channel 41 is located within the top cavity 11. The provision of the gas cooling channel 41 allows the use of a lower-temperature external air source to cool the thermal imaging element 40, thereby improving heat dissipation. Furthermore, when the gas in the gas cooling channel 41 is ejected from the outlet, it can also disperse dust at the front end of the thermal imaging element 40, thereby improving imaging accuracy.

[0042] In specific implementation, the cooling gas used can be nitrogen, which is cheap and available in large quantities. Of course, other gases can also be used, such as argon and air.

[0043] The guide plate 50 serves as a gas guide structure. In some embodiments, see Figure 1The deflector 50 includes a first deflector surface 51 and a second deflector surface 52 arranged at an angle. The first deflector surface 51 is parallel to the axis of the blast furnace roof 10, thereby reducing obstruction to the thermal imager and increasing the imaging range of the thermal imager. The second deflector surface 52 is parallel to the axis of the riser 30. The second deflector surface 52 suppresses the upward flow of the air below, reduces the impact of the airflow on the thermal imaging element 40, reduces the dust concentration in front of the thermal imaging element 40, and improves the clarity of images or videos, thereby accurately determining the flatness, temperature, and flame distribution of the material surface 70. In other embodiments, the deflector 50 may also be a conventional deflector 50 having two parallel surfaces, which can also suppress the upward flow of the air below, reduce the impact of the airflow on the thermal imaging element 40, reduce the dust concentration in front of the thermal imaging element 40, and improve the clarity of images or videos, thereby accurately determining the flatness, temperature, and flame distribution of the material surface 70.

[0044] In some embodiments, two thermal imaging elements 40 and two guide plates 50 are provided, and the thermal imaging elements 40 and the guide plates 50 are arranged in a one-to-one correspondence, and the two thermal imaging elements 40 are respectively located on both sides of the radial direction of the discharge port 12; the guide plates 50 extend out of the corresponding thermal imaging elements 40 at both ends along the circumference of the blast furnace top 10.

[0045] The guide plate 50 can be applied to the guide shell and the refractory part located in the guide shell to increase the service life of the guide plate 50.

[0046] Two thermal imaging elements 40 are provided, located on either side of the material discharge port 12 in the radial direction, to capture images or videos of various locations on the material surface 70, thereby increasing the capture range and determining the flatness, temperature, and flame distribution of the entire material surface 70. Two guide plates 50 are provided to suppress the rise of airflow below the corresponding thermal imaging element 40, thereby reducing the impact of airflow on the thermal imaging element 40 and reducing dust concentration in front of the thermal imaging element 40. This improves the clarity of the images or videos, allowing for accurate determination of the flatness, temperature, and flame distribution of the material surface 70.

[0047] In other embodiments, four thermal imaging elements 40 and four guide plates 50 may be provided, and pictures or videos of various parts of the material surface 70 may be taken to determine the flatness, temperature and flame distribution of the entire material surface 70 .

[0048] In some embodiments, the device may further include a material distribution chute 60 located in the top cavity 11 , wherein the material distribution chute 60 is provided with a material receiving end, a connecting section and a material discharge end connected in sequence, and the material receiving end is rotatably connected to the main body and corresponds to the position of the material discharge port 12 .

[0049] The distribution chute 60 is a device for distributing material to the blast furnace. The discharge end of the distribution process rotates around the receiving end, allowing the material to be distributed to any position on the material surface 70. Generally, the distribution chute 60 is tilted, with the receiving end at a higher height than the discharge end, and the receiving end is located on the axis of the blast furnace.

[0050] In some embodiments, the material distribution chute 60 is provided with a cover plate covering the connecting section and the discharge end, so as to reduce the dust flying upward from the material in the material distribution process and improve the clarity of the picture or video formed by the thermal imaging element 40 above the discharge end, so as to accurately understand the flatness, temperature and flame distribution of the material surface 70.

[0051] The cover plate and the body of the material distribution chute 60 can be fixedly connected by bolts, which can improve the strength of the material distribution chute 60.

[0052] The blast furnace roof 10 is provided with a throat pipe, the lumen of the throat pipe constitutes a discharge port 12. In some embodiments, the inner diameter of the discharge port 12 may be 630 mm to 660 mm to reduce the distribution segregation caused by tank merging.

[0053] Based on the same technical concept as the first aspect, the second embodiment of the present application provides a method for improving the detection accuracy of the blast furnace material surface 70. This method can improve the clarity of the picture or video formed by the thermal imaging element 40 to accurately obtain the flatness, temperature and flame distribution of the material surface 70.

[0054] The method provided in the embodiments of the present application is implemented based on any implementation method of the first aspect. The method provided in the present application includes:

[0055] During the blast furnace smelting process, blast furnace gas rises from the blast furnace to the top chamber 11, and the gas pressure in the top chamber 11 is controlled to 260Kpa~280Kpa to reduce the dust flow rate in the riser 30. The guide plate 50 reduces the amount of upward dust to ensure the clarity of the pictures or videos output by the thermal imaging element 40.

[0056] In the present application, the gas pressure in the top chamber 11 is controlled to be 260Kpa~280Kpa, which can also be referred to as the controlled top pressure of 260Kpa~280Kpa, for example, 263Kpa, 265Kpa, 268Kpa, 270Kpa, 272Kpa, 275Kpa, 230Kpa, 234Kpa, 245Kpa, 248Kpa, 251Kpa, 256Kpa, 259Kpa, 262Kpa, 270Kpa or 273Kpa, etc. A reduction reaction will occur in the blast furnace charge column to produce coal gas, which will rise into the top chamber 11. By controlling the coal gas pressure in the top chamber 11, the flow rate of the coal gas can be kept low, thereby reducing the flow rate of dust, reducing the amount of dust in the coal gas in the top chamber 11, and reducing the interference of dust on the thermal imaging element 40, so as to ensure the clarity of the pictures or videos output by the thermal imaging element 40; at the same time, the coal gas flow rate is reduced, which can increase the coal gas concentration, accelerate the iron ore reduction process, shorten the smelting cycle and reduce silicon reduction. In addition, the gas pressure in the top cavity 11 is 260KPa~280KPa, which has the following advantages: ① The kinetic energy of the blast furnace air is reduced, the fuel combustion speed is accelerated, and the combustion zone in the blast furnace tuyere area is reduced, which is beneficial to the reasonable distribution of the gas flow, can increase the air volume, and improve the pig iron production; ② The development of direct reduction of iron ore is inhibited, and the direct reduction is pushed to the high temperature zone, which is beneficial to CO reduction of iron ore and improves the utilization of the chemical energy of the gas; ③ High-pressure operation is not conducive to the reduction of Si in the charge, and strengthens the smelting carburizing process; ④ After high-pressure operation, the resistance of the material column to the gas decreases; on average, for every 100kPa increase in the furnace top pressure, the material column resistance loss decreases by 3kPa; production practice has proved that for every 10kPa increase in the furnace top pressure, the blast furnace air volume can be increased by 200m3 / min~250m3 / min; ⑤ After high-pressure operation, the gas flow rate in the blast furnace is reduced, the particle size of the furnace dust blown out in the gas becomes smaller, and the amount is reduced. When the top pressure reaches 150kPa to 250kPa, the amount of dust blown into the coal gas is less than 10kg / ton of iron. ⑥ For every 10kPa increase in blast furnace top pressure, the ironmaking fuel ratio decreases by 0.2% to 1.5%. ⑦ High-pressure operation improves the smooth operation of the blast furnace, reduces overhanging and material collapse, increases output, reduces heat loss per unit of pig iron, and creates conditions for increasing blast temperature. ⑧ Increasing the top pressure is beneficial for increasing the power generation of TRT equipment. ⑨ When the blast furnace adopts high top pressure operation, the wind pressure level increases while the pressure differential at the bottom remains relatively unchanged, causing the blast furnace blast to be "compressed," shrinking the combustion zone and promoting the development of airflow at the bottom edge of the blast furnace. Simultaneously, the pressure differential in the blocky zone above the soft melting zone decreases significantly due to the increase in top pressure, significantly improving furnace permeability. This results in the upper coal gas flow distribution being more controlled by the distribution of the upper charge. Adjustments to the charging system will play a greater role in optimizing the distribution of coal gas flow.

[0057] Under the premise of keeping the gas volume constant, increasing the furnace top pressure reduces the gas volume and slows the gas rise rate, increasing the contact time between the ore and the gas, which is more conducive to ore preheating and reduction. With the gas volume reduced, the CO content per unit volume increases significantly, significantly improving the kinetic conditions for CO reduction of iron oxide, allowing indirect reduction to fully develop and reducing the degree of direct reduction. This not only improves the productivity of the blast furnace but also effectively reduces its energy consumption. In other words, increasing the furnace top pressure causes the reaction (2CO=CO2+C) to develop in the direction of reducing volume, accelerating the reaction and thus reducing coke consumption. As the furnace top pressure gradually increases, the coke load increases from 5.4 to 5.9, reaching a maximum of 6.19, and the coke rate in the furnace decreases from 328kg / t to 314kg / t. According to calculations, the top pressure of Shougang Co., Ltd.'s No. 3 blast furnace increased from 235KPa to 270KPa, the gas flow rate decreased by 21%, and the residence time of the gas in the furnace was extended by 3s, which effectively promoted the development of the indirect reduction reaction. The gas utilization level increased by nearly 1.5%, and the fuel ratio decreased by 10kg / t.

[0058] Increasing the top gas pressure reduces the gas flow rate, prolonging the pulverized coal combustion time within the furnace and reducing the gas pressure differential. According to calculations, the pulverized coal combustion time within the furnace hearth is between 0.01 and 0.04 seconds, with a heating rate of 103 to 106 kph. This reduced gas flow rate allows for more complete pulverized coal combustion, which helps increase the coal ratio and reduce the coke ratio. Furthermore, the increased pressure improves the permeability of the charge column, allowing it to accommodate a larger volume of coal, also contributing to an increase in the coal ratio and a decrease in the coke ratio. Increasing the top pressure from 2.35 kg / cm² to 2.7 kg / cm² reduces the coke ratio from approximately 350 kg / t to approximately 310 kg / t, while increasing the coal ratio from approximately 170 kg / t to approximately 190 kg / t. In summary, operating a blast furnace with high top pressure can achieve better technical and economic performance, higher efficiency, and greater ironmaking benefits.

[0059] The reduced gas velocity within the furnace reduces the resistance loss of the charge column, and the buoyancy of the rising gas flow on the charge column also decreases accordingly, increasing the effective gravity of the charge column, facilitating the downward movement of the charge and promoting stable and smooth furnace conditions. These smooth furnace conditions create favorable conditions for further increasing the coke load, allowing the blast furnace to receive more air volume, and thus increasing pig iron production. As the top pressure increases from 2.35 kg / cm² to 2.7 kg / cm², the utilization factor rises from approximately 2.3 t / (m³·d) to over 2.5 t / (m³·d).

[0060] If the gas pressure in the top chamber 11 is too high, the gas flow rate will increase, stirring the dust on the charge surface 70, increasing the dust concentration in the top chamber 11, and reducing the clarity of the image or video output by the thermal imaging element 40. If the gas pressure in the top chamber 11 is too low, the gas flow rate will increase, shortening the gas residence time in the blast furnace, slowing the reduction reaction in the charge column and reducing blast furnace output.

[0061] In certain embodiments, the method further includes: during the blast furnace smelting process, distributing material through the discharge port 12, with the amount of material distributed each time being 115 to 125 tons. Specifically, material can be distributed through the distribution chute 60, with the amount of material distributed each time being 116 tons, 118 tons, 120 tons, 122 tons, 123 tons, or 124 tons, etc. The distribution amount is controlled at 115 to 125 tons, which is an improvement compared to the original state. This can increase the thickness of the material layer and help reduce the gas temperature at the furnace top from the original 200°C to approximately 130°C. The reduction in the top temperature effectively reduces the amount of dust at the furnace top, thereby effectively ensuring the imaging accuracy of the thermal imaging element 40.

[0062] The material in the blast furnace charging process is delivered by a feeder belt to the discharge port 12 and then discharged into the charging chute 60. The belt charging sequence can be optimized: 1) High-alkalinity sintered ore is placed adjacent to acidic materials (acidic pellets or blocks) to ensure mixing and interaction between the acidic and alkaline materials; 2) the head and tail of the charge are primarily composed of sintered ore, controlling the rolling of pellets toward the edge and center of the blast furnace throat; 3) coke chops are placed at the head of the charge and distributed as close to the edge as possible to improve edge permeability. Good edge permeability helps reduce dust levels near the thermal imaging device and improves observation accuracy within the furnace.

[0063] Blast furnace charge distribution can adopt a center-coke charging mode, with the center coke accounting for approximately 15-20% of the total coke load. Ore distribution is generally maintained at level 5, and coke distribution at level 6. During production, the center coke load should be gradually reduced, and the angle difference increased, following the principle of "center coke + large ore batches + large ore angles + wide platform." At the same time, the ore position should be increased based on the throttle valve opening, and the ore angle should be tilted outward, increasing the charge distribution from level 5 to level 6. The angle difference increases from 7.5° to a maximum of 11°, from K34.5°333°331°329°227°2 to K36.5°334.5°332.5°230°227.5°225.5°2. Adjustments are made during production based on temperature and gas conditions. Currently, the angle difference is around 10°, from K36°334.5°332.5°230°228°226°2, resulting in a relatively reasonable platform width.

[0064] In some embodiments, the method further comprises: during the smelting process in the blast furnace, blowing air to the blast furnace, wherein the blast air temperature is 1220° C. to 1240° C. The blast air temperature may be 1223° C., 1224° C., 1226° C., 1228° C., 1230° C., 1231° C., 1233° C., 1235° C., 1236° C., 1237° C., 1238° C., or 1239° C.

[0065] Generally, a blast furnace is equipped with a tuyeres at the bottom. Hot air is heated by a hot blast furnace and blown into the tuyeres. Controlling the blast air temperature allows for rapid penetration of the charge column. Combined with a top chamber 11 gas pressure of 260 kPa to 280 kPa, this improves smelting efficiency, increases charging rates, and lowers top chamber temperatures, thereby reducing dust concentration within the top chamber 11 and ensuring clarity in images or videos output by the thermal imaging element 40. Furthermore, high blast temperatures shift the high-temperature zone downward, increasing heat input to the furnace hearth. Furthermore, they increase blast air kinetic energy, improve the working condition of the furnace hearth, and contribute to its activation.

[0066] Air is primarily composed of oxygen and nitrogen. The purpose of using high-oxygen enrichment in smelting is to reduce nitrogen content within the furnace and maximize the concentration of reducing gases. This improves reduction efficiency, increases gas utilization, reduces the blast furnace fuel ratio, and increases the theoretical combustion temperature at the tuyere, ultimately reducing carbon emissions. Generally, every 1% increase in oxygen enrichment reduces the fuel ratio by approximately 1%. For Blast Furnace No. 3, the oxygen enrichment was gradually increased from 4.7% to 7.7%, focusing on stabilizing the theoretical combustion temperature. The theoretical combustion temperature was controlled between 2200°C and 2400°C. The coal injection rate was stabilized, with the injection ratio gradually increased from 175kg / t to 190kg / t.

[0067] Typically, multiple tuyeres are provided, with gaps between them arranged around the blast furnace. The inner diameter of the tuyere can range from 120 mm to 130 mm, such as 121 mm, 123 mm, 124 mm, 125 mm, 126 mm, 127 mm, 128 mm, or 129 mm. The reduced inner diameter of the tuyere compared to the original design increases the wind pressure at the tuyere, allowing for faster blowing through of the material column, improving production efficiency, accelerating material discharge, and lowering the top temperature, thereby reducing the dust concentration within the top chamber 11 and ensuring the clarity of the images or videos output by the thermal imaging element 40.

[0068] In some embodiments, the blast pressure may be 440 Kpa to 460 Kpa, for example, 442 Kpa, 443 Kpa, 444 Kpa, 445 Kpa, 446 Kpa, 447 Kpa, 448 Kpa, 449 Kpa, 450 Kpa, 451 Kpa, 452 Kpa, 453 Kpa, 454 Kpa, 455 Kpa, 456 Kpa, 457 Kpa, 458 Kpa or 459 Kpa, etc.

[0069] The blast pressure is controlled at 440Kpa~460Kpa. If the hot air pressure is too high, higher than 460kpa, it may increase the pressure of the hot air furnace, hot air duct and the entire air supply system. The maximum designed pipeline air supply pressure is 470kpa. Too high a design will cause the construction cost to increase exponentially. If the blast pressure is too low, lower than 440kpa, the top pressure will not be able to reach 270kpa.

[0070] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0072] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A device for improving the detection accuracy of blast furnace charge level, characterized in that: include: A blast furnace roof, wherein the blast furnace roof is in a frustum shape and is provided with a top cavity and a discharge port connected to the top cavity; There are multiple riser pipes, which are arranged around the axis of the discharge port at intervals, and are used to discharge blast furnace gas; A thermal imaging element for acquiring an image or video of the material surface of a blast furnace shaft, wherein the thermal imaging element is installed on the roof of the blast furnace and is staggered with respect to the riser along the circumference of the roof of the blast furnace; The guide plate is located in the top cavity. The thermal imaging element is arranged corresponding to the guide plate along the circumference of the blast furnace top. The riser, the guide plate, the thermal imaging element and the discharge port are arranged in sequence along the busbar direction of the blast furnace top.

2. The device for improving the detection accuracy of blast furnace charge level according to claim 1, characterized in that: The guide plate is provided with a first guide surface and a second guide surface which are arranged at an angle. The first guide surface is parallel to the axis of the blast furnace top, and the second guide surface is parallel to the axis of the riser.

3. The device for improving the detection accuracy of blast furnace charge level according to claim 2, characterized in that: There are two thermal imaging elements and two guide plates, and the thermal imaging elements are arranged in a one-to-one correspondence with the guide plates. The two thermal imaging elements are respectively located on both sides of the radial direction of the discharge port; Both ends of the guide plate along the circumference of the blast furnace roof extend out of the corresponding thermal imaging component.

4. The device for improving the detection accuracy of blast furnace charge level according to any one of claims 1 to 3, characterized in that: The thermal imaging element is provided with a gas cooling channel, the inlet of the gas cooling channel is used to communicate with an external gas source, and the outlet of the gas cooling channel is located in the top cavity.

5. The device for improving the detection accuracy of blast furnace charge level according to any one of claims 1 to 3, characterized in that: The blast furnace also includes a distribution chute located in the top cavity, the distribution chute is provided with a material receiving end, a connecting section and a material discharge end connected in sequence, the material receiving end is rotatably connected to the blast furnace roof and corresponds to the position of the material discharge port; The material distribution chute is provided with a cover plate covering the connecting section and the material discharge end.

6. A method for improving the detection accuracy of blast furnace charge level, implemented based on the device for detecting the detection accuracy of blast furnace charge level according to any one of claims 1 to 5, characterized in that: The method comprises: During the blast furnace smelting process, blast furnace gas rises from the blast furnace body to the top chamber, and the gas pressure in the top chamber is controlled to 260Kpa~280Kpa to reduce the dust flow rate in the riser. The guide plate reduces the amount of upward dust to ensure the clarity of the pictures or videos output by the thermal imaging element.

7. The method for improving blast furnace charge level detection accuracy according to claim 6, characterized in that: The method further comprises: During the blast furnace smelting process, materials are fed through the discharge port, with the amount of materials fed each time being 115 to 125 tons.

8. The method for improving blast furnace charge level detection accuracy according to claim 6, characterized in that: The method further comprises: During the blast furnace smelting process, air is blown into the blast furnace, and the air temperature of the blast is 1220°C to 1240°C.

9. The method for improving blast furnace charge level detection accuracy according to claim 8, characterized in that: The blast pressure is 440Kpa to 460Kpa.

10. The method for improving the detection accuracy of blast furnace charge level according to claim 8, characterized in that: The blast furnace blast is carried out through the tuyere of the blast furnace, and the inner diameter of the tuyere is 120mm to 130mm.

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