Ironmaking system and tapping control method

Abstract

The application discloses an iron-making system and an iron tapping control method, and belongs to the technical field of iron-making. The iron-making system comprises an iron-making furnace, iron tapping channels and a communication channel. The iron-making furnace is provided with a plurality of iron tapping openings. The number of the iron tapping channels is the same as that of the iron tapping openings. The plurality of iron tapping channels are arranged at intervals around the iron-making furnace. One end of each iron tapping channel is connected to one iron tapping opening in a one-to-one correspondence. The iron tapping channel comprises a first iron tapping section and a second iron tapping section which are connected in sequence along the direction from one end of the iron tapping opening to the other end. The communication channel is provided with at least one, and two ends of the communication channel are connected to two adjacent first iron tapping sections. The length of the communication channel is less than that of the second iron tapping section. The application utilizes the heat of the second iron tapping section corresponding to the previous iron tapping opening by the communication channel, reduces the heat loss of the multi-bag molten iron, improves the temperature stability of the multi-bag molten iron, and reduces the labor intensity and production cost of the steel-making process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ironmaking, and particularly relates to an ironmaking system and an iron tapping control method. BACKGROUND

[0002] Ironmaking is a process of obtaining molten iron by placing iron ore, sintered ore and pellet ore and other auxiliary materials containing iron raw materials into an ironmaking furnace for smelting. At present, a blast furnace is usually used as the ironmaking furnace, and the molten iron formed by smelting in the blast furnace is discharged from the iron tapping hole of the blast furnace through the iron tapping channel to the iron container (such as a ladle or a torpedo tank), and then the iron container is sent to the steelmaking for further smelting.

[0003] The blast furnace is generally provided with a plurality of iron tapping holes at the bottom of the body, and one iron tapping channel is arranged corresponding to each iron tapping hole. At present, the blast furnace generally uses multiple iron tapping holes to rotate and tap iron, and the molten iron is discharged from the iron tapping hole corresponding to the iron tapping channel and filled into the iron container. In this way of iron tapping, when the iron tapping of a certain iron tapping hole is finished, the corresponding iron channel is waiting for the next iron tapping of the iron tapping hole, and due to the heat dissipation effects such as radiation, convection and conduction with the environment, the temperature of the channel lining is continuously reduced. When the iron tapping hole is opened again, the discharged molten iron absorbs a large amount of heat when flowing through the already cooled iron tapping channel, thereby causing the molten iron filled into the iron container in different iron tapping stages to have a large difference in temperature. This will further cause the operation parameters of the subsequent steelmaking process to be adjusted frequently, thereby increasing the labor intensity of workers and the production cost. SUMMARY

[0004] To solve the above technical problems, the present application provides an ironmaking system and an iron tapping control method, which realize that multiple iron tapping holes of an ironmaking furnace share part of the iron tapping channels, thereby reducing the heat loss in the iron tapping process, improving the temperature of the molten iron, reducing the temperature fluctuation of the multiple ladles of molten iron, and reducing the cost of steelmaking.

[0005] The technical scheme of the present application is as follows:

[0006] In one aspect, the present application provides an ironmaking system, comprising:

[0007] an ironmaking furnace provided with a plurality of iron tapping holes;

[0008] an iron tapping channel, the number of the iron tapping channels is the same as that of the iron tapping holes, the plurality of iron tapping channels are spaced around the ironmaking furnace, one end of each of the iron tapping channels is connected to one of the iron tapping holes in a one-to-one correspondence, and the iron tapping channel comprises a first iron tapping section and a second iron tapping section connected in sequence in the direction from one end to the other end of the iron tapping hole;

[0009] at least one connecting channel, both ends of the connecting channel are connected to two adjacent first iron tapping sections, and the length of the connecting channel is less than the length of the second iron tapping section.

[0010] In some embodiments, the first tapping section has a length of 3-30 m, the second tapping section has a length of 5-100 m, and the communication channel has a length of 5-50 m.

[0011] In some embodiments, the communication channel is provided with a communication cavity having a first communication opening and a second communication opening at two ends thereof, a bottom wall of the communication cavity gradually decreases in height from the first communication opening to the second communication opening, and the first communication opening and the second communication opening of the communication channel are switchably communicated with two adjacent first tapping sections, respectively.

[0012] In some embodiments, the ironmaking system further comprises:

[0013] A rotating mechanism is arranged to rotate the communication channel so that the first communication opening and the second communication opening of the communication channel are switchably communicated with two adjacent first tapping sections, respectively.

[0014] In some embodiments, the ironmaking system comprises a first fixed channel and a second fixed channel, each communication channel corresponds to two first fixed channels and two second fixed channels, the two first fixed channels are communicated with two adjacent first tapping sections, respectively, the two second fixed channels are communicated with two adjacent first tapping sections, respectively, the first communication opening is switchably communicated with two first fixed channels between two adjacent first tapping sections, and the second communication opening is switchably communicated with two second fixed channels between two adjacent first tapping sections.

[0015] The bottom wall of the first fixed channel gradually decreases in height from the connected first tapping section to the communication channel, and the bottom wall of the second fixed channel gradually increases in height from the connected first tapping section to the communication channel.

[0016] In some embodiments, the first fixed channel and the second fixed channel each have a fixed opening communicated with the communication channel, the bottom wall at the fixed opening is provided with a first stepped surface, and the bottom wall of the first communication opening and the second communication opening each is provided with a second stepped surface matched with the first stepped surface.

[0017] In some embodiments, the tapping opening is provided with four tapping openings, and the communication channel is provided with four communication channels, one communication channel being arranged between every two adjacent tapping channels.

[0018] In some embodiments, the communication channel comprises:

[0019] A channel body is provided with a communication cavity having an opening at a top portion thereof.

[0020] A heat-insulating cover is connected to the channel body to cover the opening.

[0021] In another aspect, the present application also provides a tapping control method suitable for the aforementioned iron-making system, comprising the following steps:

[0022] determining a first tapping section connected with the tapping hole to be tapped;

[0023] obtaining the remaining life t, temperature T and position of the plurality of second tapping sections;

[0024] under the condition that the second tapping section with the remaining life t>0 and temperature T>T0 belongs to two adjacent tapping channels with the determined first tapping section, and a connecting channel is connected between the two adjacent tapping channels, opening the connecting channel to tap the second tapping section with the remaining life t>0 and temperature T>T0, T0 being a set value.

[0025] The beneficial effects of the present application at least include:

[0026] The present invention provides an ironmaking system, which includes an ironmaking furnace, an iron outlet ditch and a connecting ditch, wherein the ironmaking furnace is provided with multiple iron outlets; the number of the iron outlet ditch is the same as the number of the iron outlets, and the multiple iron outlet ditch is spaced apart and surrounded by the ironmaking furnace, one end of the iron outlet ditch is connected to the iron outlet in a one-to-one correspondence, and the iron outlet ditch includes a first iron outlet section and a second iron outlet section connected in sequence along the direction from one end to the other end of the iron outlet; there is at least one connecting ditch, and the two ends of the connecting ditch are respectively connected to two adjacent first iron outlet sections, and the length of the connecting ditch is less than the length of the second iron outlet section. When a blast furnace is first put into operation or after an overhaul, the temperature of each tapping channel is significantly lower than the molten iron. After a tapping channel in the furnace finishes tapping, the first and second tapping sections of that tapping channel, having absorbed heat from the hot molten iron during the tapping process, remain at elevated temperatures. The opening of the connecting channel between the tapping channel corresponding to the next tapping channel and the previous tapping channel changes the molten iron's path from the traditional "first tapping section + second tapping section" of the corresponding tapping channel to "first tapping section + connecting channel + second tapping section corresponding to the previous tapping channel." Analysis of these two paths reveals that: 1. Both before and after the improvement, the molten iron must pass through the cooler first tapping section; 2. The connecting channel is shorter than the second tapping section, meaning that the molten iron transfers less heat to the tapping channel than to the second tapping section; and 3. The second tapping section of the previous tapping channel is hotter, resulting in very low heat exchange between the molten iron and the hotter second tapping section. Therefore, the improved molten iron path provided by the present application has less heat loss than before the improvement, which can increase the temperature of the first ladle of molten iron discharged from the next taphole, thereby improving the temperature stability of multiple ladles of molten iron discharged from the ironmaking furnace. In addition, the length of the first tapping section is very short, generally 3-30 meters, the length of the second tapping section is longer, 5-100 meters, and the length of the connecting groove is usually 5-50 meters. This can maximize the use of the heat of the second tapping section corresponding to the previous taphole, further reducing the heat loss of multiple ladles of molten iron and improving the temperature stability of multiple ladles of molten iron. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of an ironmaking system according to an embodiment of the present application is shown;

[0028] Figure 2 for Figure 1 The process structure diagram of the ironmaking control method of the ironmaking system.

[0029] Description of reference numerals:

[0030] 10 - iron furnace; 11 - tapping hole; 20 - iron runner, 21 - first iron tapping section, 22 - second iron tapping section, 23 - main runner, 24 - branch runner, 30 - connecting runner; 40 - first fixed runner; 50 - second fixed runner; 60 - track. DETAILED DESCRIPTION

[0031] In order to make the skilled in the art to which the present application belongs more clearly understand the present application, the technical solutions of the present application are described in detail below with specific embodiments combined with the accompanying drawings.

[0032] During the tapping of the blast furnace, the tapping hole is determined according to the production organization, and once the tapping hole is determined, 3-6 ladles of molten iron are continuously tapped from the tapping hole, and after the tapping from the tapping hole is completed, the next tapping hole is determined according to the smelting situation, and the next tapping hole is generally different from the previous tapping hole. Therefore, the temperature of the molten iron runner before tapping is about 600-800℃, which is much lower than the temperature of the molten iron. Therefore, when the 1500℃ molten iron flows in the molten iron runner, it will transfer heat to the molten iron runner until the temperature of the molten iron is consistent with the temperature of the molten iron runner. Therefore, the temperature of the first ladle of molten iron tapped from the determined molten iron runner is very low, generally below 1400℃, the temperature of the second ladle of molten iron is higher than that of the first ladle, the temperature of the third ladle of molten iron is higher than that of the second ladle, and so on, until the temperature of the molten iron in the ladle stabilizes at a certain temperature. From the above content, it can be seen that the temperature of the molten iron in the multiple ladles tapped from one tapping hole increases in turn according to the tapping order and gradually tends to be stable. The multiple ladles tapped from the next tapping hole also show the above-mentioned temperature increasing in turn and then tending to be stable. Thus, the molten iron raw material sent to the steelmaking process has a large temperature fluctuation and poor stability, which affects the operation parameter adjustment frequency of the subsequent steelmaking process, the labor intensity of workers, the smelting production rhythm, the product quality qualification rate and the production cost.

[0033] In order to solve the problem of large temperature fluctuation and low stability of the molten iron raw material in the steelmaking process, the present application provides an ironmaking system. The setting of the connecting runner can reduce the heat loss of the molten iron from the iron furnace to the molten iron device, improve the temperature and temperature stability of the tapped molten iron, and reduce the cost of the steelmaking process.

[0034] Referring to Figure 1The iron-making system provided by the embodiments of the present application comprises an iron-making furnace 10, a tapping channel 20 and a communication channel 30, wherein the iron-making furnace 10 is provided with a plurality of tapping holes 11; the number of the tapping channels 20 is the same as that of the tapping holes 11, and the plurality of tapping channels 20 are arranged around the iron-making furnace 10 at intervals, one end of each of the tapping channels 20 is communicated with one of the tapping holes 11, and the tapping channel 20 comprises a first tapping section 21 and a second tapping section 22 which are communicated in sequence along the direction from the end close to the tapping hole 11 to the other end; the communication channel 30 is provided with at least one, and the two ends of the communication channel 30 are respectively communicated with two adjacent first tapping sections 21, and the length of the communication channel 30 is less than that of the second tapping section 22.

[0035] Any two adjacent tapholes 20 can be distributed with one communication channel 30, or two communication channels 30, or no communication channel 30, and the specific mode is not limited by the application. When two communication channels 30 are arranged between two adjacent tapholes 20, one can be used and the other can be reserved to improve production efficiency. The iron-making furnace 10 is used to smelt iron-containing raw materials into molten iron, and the iron-making furnace 10 can be a blast furnace or other iron-making furnace 10, and the specific type is not limited. The taphole 20 is used to discharge the molten iron smelted by the iron-making furnace 10 into a molten iron ladle, a torpedo tank or other molten iron container. When the iron-making furnace 10 is first used or after major repair, the temperature of each taphole 20 is relatively low. After the molten iron is discharged from a taphole 20, the first taphole section 21 and the second taphole section 22 of the taphole 20 are relatively high in temperature because they obtain heat from the high-temperature molten iron during the molten iron discharge process. Under the action of the communication channel 30 between the next taphole 11 corresponding to the taphole and the taphole that has just finished discharging molten iron, the communication channel 30 can be opened, so that the running path of the molten iron discharged from the next taphole 11 changes from the traditional first taphole section 21+second taphole section 22 of the corresponding taphole to the first taphole section 21 of the corresponding taphole+communication channel 30+second taphole section 22 corresponding to the next taphole 11. Analyzing the above two paths: 1. Both before and after the improvement, the first taphole section 21 needs to pass through a taphole section with a relatively low temperature; 2. The length of the communication channel 30 is less than the length of the second taphole section 22, that is, compared with the second taphole section 22, the heat transferred to the taphole from the communication channel 30 is relatively small, and preferably, the length of the communication channel 30 is less than two-thirds of the length of the second taphole section 22; 3. The temperature of the second taphole section 22 of the previous taphole 11 is relatively high, and the heat exchange amount between the molten iron and the second taphole section 22 with a relatively high temperature is very low. Therefore, the heat loss of the improved molten iron running path provided by the application is smaller than that before the improvement, so that the temperature of the first ladle of molten iron discharged from the next taphole 11 can be increased, thereby improving the temperature stability of the multiple ladles of molten iron discharged from the iron-making furnace 10. In addition, the length of the first taphole section 21 is very short, generally 3-10 m, the length of the second taphole section 22 is relatively long, generally 20-30 m, and the length of the communication channel 30 is generally 10-20 m. In this way, the heat of the second taphole section 22 corresponding to the previous taphole 11 can be utilized as much as possible, thereby further reducing the temperature stability of the multiple ladles of molten iron and improving the temperature stability of the multiple ladles of molten iron.

[0036] In some embodiments, the length of the first taphole section 21 is 3-30 m, the length of the second taphole section 22 is 5-100 m, and the length of the communication channel 30 is 5-50 m.

[0037] In some embodiments, the communication groove 30 is provided with a communication cavity having a first communication port and a second communication port at two ends respectively, the bottom wall height of the communication cavity decreases in turn along the direction from the first communication port to the second communication port, and the first communication port and the second communication port of the communication groove 30 are switchably communicated with two adjacent first tapping sections 21 respectively. The flow of molten iron in the communication groove 30 relies on gravity without adding external power. The bottom wall height of the communication cavity decreases in turn along the direction from the first communication port to the second communication port, and the molten iron can automatically flow from the first communication port to the second communication port, that is, from one first tapping section 21 to the adjacent first tapping section 21 through the communication groove 30. The communication groove 30 is switchably communicated with two adjacent first tapping sections 21, so that the molten iron can automatically flow from one first tapping section 21 to another first tapping section 21, or automatically flow from another first tapping section 21 to the first tapping section 21, meeting the different flow direction requirements of the two adjacent tapping channels 20.

[0038] In some embodiments, the tapping system further comprises a rotating mechanism for rotating the communication groove 30 so that the first communication port and the second communication port of the communication groove 30 are switchably communicated with two adjacent first tapping sections 21 respectively. The rotating mechanism is located below the communication groove 30, and comprises a motor and a support. The output shaft of the motor is arranged in the vertical direction, and the support is connected to the output shaft and the communication groove 30. The rotation of the motor directly drives the rotation of the communication groove 30. In other embodiments, the rotating mechanism can also be a crown block. The crown block is located above the communication groove 30, and the rotation of the communication groove 30 is realized by hoisting the crown block. The above two means for realizing the rotation of the communication groove 30 are only listed, and the crown block is a prior art. More details of the crown block can be referred to the prior art, and are not limited in particular.

[0039] In some embodiments, the ironmaking system comprises a first fixed channel 40 and a second fixed channel 50, each communication channel 30 corresponds to two first fixed channels 40 and two second fixed channels 50, the two first fixed channels 40 are respectively connected to two adjacent first tapping sections 21, and the two second fixed channels 50 are respectively connected to two adjacent first tapping sections 21, the first communication port is switchably connected to the two first fixed channels 40 between the two adjacent first tapping sections 21, and the second communication port is switchably connected to the two second fixed channels 50 between the two adjacent first tapping sections 21; the bottom wall height of the first fixed channel 40 decreases in the direction from the connected first tapping section 21 to the communication channel 30, and the bottom wall of the second fixed channel 50 increases in the direction from the connected first tapping section 21 to the communication channel 30. The design of the first fixed channel 40 and the second fixed channel 50 can reduce the rotation angle of the communication channel 30 and has low space requirements; for example, for two adjacent tapping channels 20 and two first fixed channels 40 and two second fixed channels 50 between the two adjacent tapping channels 20, the first fixed channel 40 is close to the tapping hole 11, the second fixed channel 50 is away from the tapping hole 11, the first communication port of the communication channel 30 is connected to one of the first fixed channels 40, and the second communication port of the communication channel 30 is connected to one of the second fixed channels 50. When the communication channel 30 needs to be rotated, the first communication port can be connected to the other first fixed channel 40 and the second communication port can be connected to the other second fixed channel 50 by rotating the communication channel 30 at an angle less than 180°.

[0040] In some embodiments, the first fixed channel 40 and the second fixed channel 50 each have a fixed port connected to the communication channel 30, the bottom wall at the fixed port is provided with a first stepped surface, and the bottom wall of the first communication port and the second communication port is provided with a second stepped surface matched with the first stepped surface. The first stepped surface and the second stepped surface improve the connection strength and sealing performance between the communication channel 30 and the first fixed channel 40 and the second fixed channel 50.

[0041] Specifically, the tapping hole 11 can be provided with four, and the communication channel 30 is provided with four, one communication channel 30 is arranged between every two adjacent tapping channels 20. The ironmaking system comprises a track 60 for the operation of the ladle, the track 60 is provided with two, one track 60 is arranged on each side of the blast furnace, two tapping holes 11 are arranged on each side of the blast furnace, the two tapping holes 11 arranged on the same side are arranged at intervals, and the tapping channels 20 connected by the two tapping holes 11 arranged on the same side are also arranged on the same side of the blast furnace.

[0042] In some embodiments, the communication channel 30 comprises a channel body and a heat preservation cover, the channel body is provided with a communication cavity with an opening at the top, and the heat preservation cover is connected to the channel body to cover the opening. The structure comprises a shell and a heat preservation layer, the shell is provided with an inner cavity with an opening at the top, and the heat preservation layer covers the inner wall of the inner cavity to form a communication cavity. The shell can be obtained by welding a steel plate, and the heat preservation layer can be obtained by masonry or pouring refractory material, and the specific method is not limited. The bottom of both ends of the shell is provided with a first stepped surface. Generally, when the heat preservation layer inside the communication channel 30 is eroded by molten iron and cannot be used, the heat preservation layer inside the communication channel 30 is masonry. When the heat preservation layer is re-masonry, the communication channel 30 can be rotated by using a rotating mechanism, and then the heat preservation layer is masonry.

[0043] In some embodiments, the tapping channel 20 comprises a main channel 23 and a branch channel sequentially communicated from one end close to the tapping hole 11 to the other end. The main channel 23 comprises a first tapping section 21 and at least part of a second tapping section 22, and the branch channel comprises the remaining second tapping section 22. The main channel 23 is used for flowing molten iron covered with slag, and the molten iron and slag are separated at the branch channel, so that the molten iron flows into the iron holding device along the branch channel.

[0044] The use process of the ironmaking system provided by the embodiments of the present application is as follows: when the blast furnace is first put into use or the first tapping is performed after the overhaul, the first tapping hole 11 for the first tapping is opened, the molten iron is discharged from the first tapping hole 11 and the tapping channel 20 communicated with the first tapping hole 11 to the ladle, and the tapping is ended when the first tapping hole 11 discharges five ladles; when the tapping hole 11 needs to be replaced for the second tapping, the second tapping hole 11 for the second tapping is determined first. If the tapping channel 20 corresponding to the second tapping hole 11 is adjacent to the tapping channel 20 corresponding to the first tapping hole 11, the tapping channel 20 corresponding to the first tapping hole 11 and the second tapping hole 11 is communicated by the communication channel 30, the remaining life of the tapping channel 20 corresponding to the first tapping hole 11 is greater than 0, and the temperature T is greater than T0, the tapping channel 20 corresponding to the second tapping hole 11 is blocked by refractory material, so that the molten iron flows out from the second tapping hole 11, the first tapping section 21 corresponding to the second tapping hole 11, the communication channel 30 and the second tapping section 22 corresponding to the first tapping hole 11 in sequence, and the tapping is ended when the second tapping hole 11 discharges five ladles; when the tapping hole 11 needs to be replaced for the third tapping, the third tapping hole 11 for the third tapping is determined first. If the tapping channel 20 corresponding to the third tapping hole 11 is not adjacent to the first tapping hole 11, the third tapping hole 11 is opened, and the molten iron is discharged from the tapping channel 20 corresponding to the third tapping hole 11.

[0045] In addition, the iron-making system further comprises a slag channel for discharging slag and a residual iron channel for discharging residual iron, the number of the slag channels is the same as the number of the tapping channels 20, the slag channels are communicated with the first tapping sections 21 of the corresponding tapping channels 20, the number of the residual iron channels is the same as the number of the tapping channels 20, the residual iron channels are communicated with the first tapping sections 21 of the corresponding tapping channels 20, the communication point of the first tapping section 21 and the slag channel is closer to the iron-making furnace 10 than the communication point of the first tapping section 21 and the residual iron channel, in some embodiments, the communication channel 30 can be communicated with the communication point of the slag channel and the first tapping section 21, the communication channel 30 can also be communicated with the communication point of the residual iron channel and the first tapping section 21, which is not limited in the present application. In other embodiments, the first tapping section 21 is provided with a slag-iron separator for separating molten iron and slag, and the slag-iron separator is located between the communication point of the residual iron channel and the first tapping section 21 and the communication point of the slag channel and the first tapping section 21.

[0046] The iron-making system provided by the embodiments of the present application realizes smooth tapping of molten iron, improves the temperature uniformity of molten iron in different ladles, and ensures the temperature uniformity of molten iron raw materials for steelmaking.

[0047] On the other hand, the present application also provides a tapping control method suitable for the aforementioned iron-making system, please refer to Figure 2 The tapping control method comprises the following steps:

[0048] S1, determining the first tapping section 21 communicated with the tapping hole of the iron-making furnace to be tapped;

[0049] Generally, the plurality of tapping holes are distributed at intervals around the iron-making furnace, and the molten iron in the iron-making furnace is tapped through the plurality of tapping holes to completely tap the molten iron dispersed in the iron-making furnace.

[0050] S2, obtaining the remaining life t, the temperature T and the position of the plurality of second tapping sections;

[0051] The remaining life t of the second tapping section can be determined by the residual thickness of the inner wall of the second tapping section, the thicker the residual thickness of the second tapping section, the fewer the number of uses of the second tapping section, and the greater the remaining life t of the second tapping section, the thinner the residual thickness of the second tapping section, the more the number of uses of the second tapping section, and the smaller the remaining life t of the second tapping section. The remaining life t of the second tapping section can also be determined by the over-iron amount of the second tapping section, the greater the over-iron amount of the second tapping section, the smaller the remaining life t of the second tapping section, and the smaller the over-iron amount of the second tapping section, the greater the remaining life t of the second tapping section. The temperature T of the second tapping section can be obtained by measuring with a temperature measuring instrument.

[0052] S3, under the condition that the second tapping section with the remaining life t>0 and temperature T>T0 belongs to two adjacent tapping channels with the determined first tapping section 21, and the two adjacent tapping channels are communicated with a communication channel, the communication channel is opened to tap from the second tapping section with the remaining life t>0 and temperature T>T0, wherein T0 is a set value.

[0053] The setting of T0 can be determined according to actual conditions, for example, T0 can be set to 0-1000℃.

[0054] When the second tapping section with the remaining life t>0 and temperature T>T0 does not belong to two adjacent tapping channels with the determined first tapping section 21, then the tapping is selected to be directly from the second tapping section corresponding to the tapping hole to be tapped. When the second tapping section with the remaining life t>0 and temperature T≤T0 belongs to two adjacent tapping channels with the determined first tapping section 21, then the tapping is selected to be directly from the second tapping section corresponding to the tapping hole to be tapped.

[0055] The tapping control method provided by the application makes full use of the high temperature characteristics of the tapping channel of the last tapping, so that the next tapping is from the high temperature tapping channel of the last tapping, reduces the heat loss of the molten iron, improves the temperature of the tapped molten iron, reduces the input of the temperature raising agent in the steelmaking process, reduces the steelmaking cost, reduces the temperature fluctuation of the multi-bag molten iron, and stabilizes the steelmaking process.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art who are familiar with the basic inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An ironmaking system, characterized in that: include: Ironmaking furnace, equipped with multiple tapholes; a plurality of tapping grooves, the number of which is the same as the tapping holes, the plurality of tapping grooves being spaced apart and surrounding the ironmaking furnace, one end of each tapping groove being connected to the tapping holes in a one-to-one correspondence, the tapping grooves comprising a first tapping section and a second tapping section being connected in sequence from one end close to the tapping holes to the other end; At least one connecting groove, the two ends of which are respectively connected to the two adjacent first iron-out sections, and the length of the connecting groove is less than the length of the second iron-out section; the connecting groove is provided with a connecting cavity having a first connecting port and a second connecting port at both ends respectively, and the bottom wall height of the connecting cavity decreases successively in the direction from the first connecting port to the second connecting port.

2. The ironmaking system according to claim 1, characterized in that The length of the first iron-outlet section is 3-30 m, the length of the second iron-outlet section is 5-100 m, and the length of the connecting ditch is 5-50 m.

3. The ironmaking system according to claim 1, characterized in that The ironmaking system further comprises: The rotating mechanism is used to rotate the communicating groove so that the first communicating port and the second communicating port of the communicating groove can be respectively and switchably connected to two adjacent first iron-out sections.

4. The ironmaking system according to claim 1, characterized in that The ironmaking system includes a first fixed groove and a second fixed groove, each connecting groove corresponds to two first fixed grooves and two second fixed grooves, the two first fixed grooves are respectively connected to two adjacent first iron-out sections, and the two second fixed grooves are respectively connected to two adjacent first iron-out sections, the first connecting port is switchably connected to the two first fixed grooves located between the two adjacent first iron-out sections, and the second connecting port is switchably connected to the two second fixed grooves located between the two adjacent first iron-out sections; The bottom wall height of the first fixed groove decreases in sequence along the direction from the connected first iron tapping section to the connecting groove, and the bottom wall height of the second fixed groove increases in sequence along the direction from the connected first iron tapping section to the connecting groove.

5. The ironmaking system according to claim 4, characterized in that The first fixing groove and the second fixing groove both have a fixing port communicating with the communicating groove, the bottom wall of the fixing port is provided with a first step surface, and the bottom wall of the first communicating port and the second communicating port are both provided with a second step surface matching the first step surface.

6. The ironmaking system according to any one of claims 1 to 5, characterized in that: There are four iron outlets, four connecting grooves, and one connecting groove is provided between every two adjacent iron outlet grooves.

7. The ironmaking system according to any one of claims 1 to 5, characterized in that: The connecting groove comprises: The ditch body is provided with a communicating cavity with an opening at the top; A heat-insulating cover is connected to the ditch body to cover the opening.

8. The ironmaking system according to any one of claims 1 to 5, characterized in that: The iron tapping ditch includes a main ditch and a branch ditch connected in sequence from one end close to the iron tapping hole to the other end. The main ditch includes the first iron tapping section and part of the second iron tapping section, and the branch ditch includes the remaining second iron tapping section.

9. A method for controlling iron tapping in an ironmaking system according to any one of claims 1 to 8, characterized in that: The steps include: Determine a first tapping section connected to a tapping port of a blast furnace where iron is to be tapped; Obtaining the remaining life t, temperature T, and position of multiple second tapping sections; Under the condition that the second iron-out segment with the remaining life t>0 and the temperature T>T0 and the determined first iron-out segment belong to two adjacent iron-out grooves, and the two adjacent iron-out grooves are connected by a connecting groove, the connecting groove is opened and iron is tapped from the second iron-out segment with the remaining life t>0 and the temperature T>T0, and T0 is the set value.

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