Flow guide and control system for blast furnace molten iron

Abstract

The invention provides a blast furnace molten iron flow guide and control system which comprises a branch channel, a molten iron collecting area is arranged at the tail end of the branch channel, at least one first-order flow guide hole is formed in the bottom of the molten iron collecting area, the center line of the first-order flow guide hole is perpendicular to the horizontal plane, and a fixed flow groove is formed under the first-order flow guide hole. A flow stabilizer precast block is arranged in the fixed launder; the fixed runner is reasonable in design structure and convenient to use, the runner head of the branch runner is blocked, and the first-order flow guide hole for vertically and downwards guiding flow is formed in the tail of the branch runner, so that molten iron flows out vertically and downwards along the first-order flow guide hole all the time when being guided out, on one hand, point positions falling on the fixed runner can be consistent, and on the other hand, the molten iron is prevented from falling off; the flushing control of different point positions of the fixed launder can be realized through different flow guide holes, the service life of the fixed launder below the fixed launder is prolonged, on the other hand, the problems of residual drainage and dripping at the tail end of the ditch head can be avoided, the overhaul frequency of the branch ditch head is reduced, and the overhaul cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of molten iron circulation channel structure design, and in particular relates to a flow guiding and controlling system for molten iron in a blast furnace. Background Art

[0002] At present, the flow route of molten iron after it is discharged from the blast furnace usually follows a series of equipment and operating steps to ensure the efficient and safe transportation and handling of molten iron. After the molten iron flows out of the iron outlet of the blast furnace, it enters the iron outlet ditch, and then enters the branch ditch through the iron outlet hook, and finally flows from the branch ditch to the swinging chute below. The swinging chute is controlled by a mechanical or hydraulic system to evenly distribute the molten iron and avoid the molten iron from concentrating on a certain position, thereby extending the service life of the chute. The swing angle and frequency of the swinging chute can be adjusted to ensure that the molten iron flows to the ladle or ladle. After entering the ladle or ladle, the molten iron is finally formed into a billet, ingot or other steel products after desulfurization, transportation, converter, casting and other processes.

[0003] In the process of molten iron flowing from the branch ditch to the swing ladle, and then from the swing ladle to the ladle or ladle, there are certain defects, such as Figure 3 As shown, the molten iron flows out from the end of the branch ditch, falls on the swinging flow trough, and then flows downward from one end of the swinging flow trough. In this process, there are different pressure stages when the molten iron is discharged from the blast furnace (the pressure inside the blast furnace is high in the initial stage, and the pressure gradually decreases over time), and the different pressures will cause the flow speed of the molten iron in the branch ditch to be different, which eventually causes the impact point on the swinging flow trough to change continuously, making it impossible to determine the installation position of the stabilizer prefabricated block on the swinging flow trough, and then the stabilizer prefabricated block cannot be installed, resulting in the problem of reduced service life of the swinging flow trough; in addition, when the molten iron flows out of the branch ditch, the molten iron at the ditch head continues to flow, or the molten iron drains downward, resulting in frequent damage to the ditch head position, which requires continuous maintenance and affects normal iron tapping. Similarly, since the swinging trough also uses a principle similar to the ditch head structure of the branch ditch to discharge the molten iron to the lower molten iron ladle, the iron outlet position of the swinging trough also has the problem of difficult to control the iron tapping speed and easy damage. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a flow diversion and control system for blast furnace molten iron, the head position of the branch ditch is blocked, and a first-order diversion hole for vertically downward diversion is set at the tail of the branch ditch, so that the molten iron always flows vertically downward along the first-order diversion hole when it is discharged. On the one hand, the points falling on the fixed flow trough can be made consistent, and the scouring control of different points of the fixed flow trough can be achieved through different diversion holes, thereby extending the service life of the fixed flow trough below. On the other hand, the problems of residual water and dripping at the end of the ditch head can be avoided, the frequency of renovation of the branch ditch head is reduced, and the renovation cost is reduced. In addition, since the molten iron discharged downward from the head position of the branch ditch can fall on the specified position of the fixed flow trough, a stabilizer prefabricated block can be installed on the fixed flow trough to improve the scouring and erosion resistance of the surface of the fixed flow trough and extend the service life of the fixed flow trough. In addition, a second-order diversion hole can be opened on the fixed flow trough to achieve the purpose of stable molten iron flow rate and high service life.

[0005] The technical solution adopted by the present invention is: a flow diversion and control system for molten iron in a blast furnace, comprising a branch ditch, a molten iron collection area is arranged at the end of the branch ditch, at least one first-order diversion hole is arranged at the bottom of the molten iron collection area, the center line of the first-order diversion hole is perpendicular to the horizontal plane, a fixed flow trough is arranged directly below the first-order diversion hole, a stabilizer prefabricated block is arranged inside the fixed flow trough, and the molten iron flowing out from the upper molten iron diversion hole can flow to the surface of the stabilizer prefabricated block.

[0006] A molten iron blocking block is provided at the end of the branch groove.

[0007] The cross-sectional shape of the molten iron blocking block is a semi-arc structure.

[0008] The upper plane of the molten iron collection area is lower than the bottom plane of the branch ditch.

[0009] At least one first seat brick is fixed at the bottom of the molten iron collection area, and a first-order guide hole is opened at the center position of the seat brick.

[0010] The first brick is machine pressed or cast prefabricated.

[0011] The fixed flow channel is a central concave structure, the stabilizer prefabricated block is installed at the center of the fixed flow channel, and second bricks are installed on both sides of the fixed flow channel. The center of the second brick is provided with a second-order guide hole.

[0012] Molten iron flow control mechanisms for achieving flow control and on-off effects are installed at the positions of the first-order guide holes and the second-order guide holes.

[0013] The beneficial effects of the present invention are: (1) The present invention has a reasonable design structure and is easy to use. The head of the branch ditch is blocked, and a first-order guide hole for vertically guiding downward is set at the tail of the branch ditch, so that the molten iron always flows vertically downward along the first-order guide hole when it is discharged. On the one hand, the points where the molten iron falls on the fixed flow trough can be made consistent, and the flushing control of different points of the fixed flow trough can be achieved through different guide holes, thereby extending the service life of the fixed flow trough below. On the other hand, the problem of residual dripping and dripping at the end of the ditch head can be avoided, thereby reducing the frequency of renovation of the branch ditch head and reducing the renovation cost.

[0014] (2) In the present invention, the molten iron guided downward from the head of the branch ditch can fall into the specified position of the fixed flow trough. Therefore, a flow stabilizer prefabricated block can be installed on the fixed flow trough to improve the scouring and erosion resistance of the surface of the fixed flow trough and extend the service life of the fixed flow trough. In addition, a second-order guide hole can be opened on the fixed flow trough to achieve the purpose of stable molten iron flow rate and long service life.

[0015] (3) The present invention utilizes a fixed launder to replace the traditional swinging launder structure. On the one hand, it can avoid driving the swinging launder, save electricity resources, and reduce the difficulty of work. On the other hand, it can enable the fixed launder to store a certain amount of molten iron when in use, so that the upper molten iron can contact the lower molten iron when it falls, avoiding direct impact on the fixed launder, which is beneficial to extending the service life of the fixed launder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present invention; Figure 2 It is a three-dimensional diagram of the branch ditch of the present invention; Figure 3 It is a flow route map of molten iron in the prior art.

[0017] Markings in the figure: 1. branch ditch; 2. collection area; 3. first brick; 4. first-order diversion hole; 5. molten iron blocking block; 6. fixed flow channel; 7. stabilizer prefabricated block; 8. second brick; 9. second-order diversion hole. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0019] As shown in the figure, a flow control system for molten iron in a blast furnace includes a branch ditch 1, a molten iron collection area 2 is provided at the end of the branch ditch 1, and the upper plane of the molten iron collection area 2 is lower than the bottom plane of the branch ditch 1. Specifically, a molten iron blocking block 5 is provided at the end of the branch ditch 1, and the molten iron blocking block 5 is sealed and connected to the branch ditch 1. The cross-sectional shape of the molten iron blocking block 5 is a semi-arc structure, which is mainly used to prevent the molten iron from flowing downward from the edge of the ditch head and avoid different speed differences of the molten iron in the horizontal direction. The molten iron blocking block 5 can be set to make the molten iron first concentrated in the collection area 2, so that a certain amount of molten iron can be stored at the ditch head position, and the "steel ladle" of the ditch head position is realized.

[0020] At least one first-order guide hole 4 is provided at the bottom of the molten iron collection area 2, and the center line of the first-order guide hole 4 is perpendicular to the horizontal plane. Specifically, at least one first seat brick 3 is fixed at the bottom of the molten iron collection area 2, and the first-order guide hole 4 is opened at the center position of the seat brick. The first seat brick 3 is machine-pressed or cast prefabricated.

[0021] A fixed flow chute 6 is provided directly below the first-order guide hole 4, and a stabilizer prefabricated block 7 is provided inside the fixed flow chute 6, wherein the fixed flow chute 6 is a "ladle"-like structure, that is, it is closed on all sides. After the molten iron falls into the fixed flow chute 6, a certain amount of storage can be carried out, replacing the structure of the traditional swinging flow chute, and the molten iron flowing out of the upper molten iron guide hole can flow to the surface of the stabilizer prefabricated block 7. The stabilizer prefabricated block 7 can also be called an impact plate, which is used to receive the molten iron falling from above.

[0022] Such an arrangement is used to replace the original groove head position where the molten iron flows out horizontally with a horizontal velocity, so that the molten iron can flow downward from the first-order guide hole 4 and fall on the specified position of the fixed flow channel 6 below, so that the impact point on the fixed flow channel 6 will not change. In this way, the stabilizer prefabricated block 7 can be installed at the impact position of the fixed flow channel 6. The stabilizer prefabricated block 7 can be made of machine-pressed bricks or silicon nitride combined with silicon carbide bricks to achieve the erosion resistance effect of the stabilizer. In addition, since the fixed flow channel 6 replaces the structure of the traditional swinging flow channel, a certain amount of molten iron can be stored inside it. When the molten iron falls, the falling molten iron can fall on the surface of the molten iron inside the fixed flow channel 6, thereby further reducing the erosion of the stabilizer prefabricated block 7, thereby further extending the service life of the fixed flow channel 6.

[0023] In practice, the number of the first bricks 3 can be set to multiple, and different first-order diversion holes 4 can be selected according to different needs to achieve diversion work. Other first-order diversion holes 4 can be blocked with gun mud when not in use, and then opened when in use. In another embodiment, a molten iron flow control mechanism is set at the position of each diversion hole to achieve the blocking of the diversion hole.

[0024] Specifically, the fixed flow trough 6 is a central concave structure, the flow stabilizer prefabricated block 7 is installed at the center position of the fixed flow trough 6, and the second bricks 8 are respectively installed on both sides of the inside of the fixed flow trough 6. A second-order guide hole 9 is opened in the center of the second brick 8. This arrangement is to eliminate the horizontal flow velocity when the molten iron falls from the fixed flow trough 6, so as to make the molten iron fall into the ladle or molten iron tank below in the vertical direction, so as to keep the impact point in the ladle or molten iron tank unchanged, thereby extending the service life of the ladle or molten iron tank.

[0025] In order to achieve the on-off and flow control effects of molten iron, molten iron flow control mechanisms for achieving flow control and on-off effects are installed at the positions of the first-order guide holes 4 and the second-order guide holes 9, wherein the molten iron flow control mechanism is a slide plate mechanism for the sliding water inlet of the ladle, and there is a through hole on the slide plate, whose center line is parallel to the center lines of the first-order guide holes 4 and the second-order guide holes 9. When in use, the slide plate is located above each guide hole, and the horizontal movement of the slide plate is controlled by hydraulic means, thereby achieving the on-off of the first-order guide holes 4 and the second-order guide holes 9, effectively controlling the molten iron flow rate, and achieving the flow control effect. The specific structure and principle of this movable slide plate mechanism to control the on-off of molten iron belong to conventional technical means in the prior art and will not be elaborated here.

[0026] When this flow diversion and control system for blast furnace molten iron is in use, the molten iron first gathers in the gathering area 2 at the ditch head position during the process of flowing from the branch ditch 1 to the fixed flow channel 6 below, and then flows downward through the first-order diversion hole 4 below the gathering area 2. The downward flow of the molten iron can flush the designated position on the fixed flow channel 6, thereby facilitating the installation of the stabilizer prefabricated block 7 at the impact point position of the fixed flow channel 6, thereby extending the service life of the fixed flow channel 6. In addition, since the fixed flow channel 6 replaces the traditional swinging flow channel, on the one hand, it can save electricity resources used to drive the swinging flow channel to swing, reduce the difficulty and complexity of the work, and on the other hand, it can store a certain amount of molten iron inside the fixed flow channel 6, and the molten iron above can fall on the surface of the stored molten iron when it falls, thereby reducing the pressure on the stabilizer prefabricated block. The impact of the block 7 is beneficial to further extend the service life of the fixed flow channel; and one or more of the first-order guide holes 4 can be selected to be blocked according to needs, so that the first-order guide holes 4 at the designated position remain unobstructed, which is convenient for targeted control and adjustment of the flushing point of the fixed flow channel 6 below; since the first brick 3 and the molten iron blocking block 5 are set at the groove head position instead of the traditional open structure, the problem of erosion of the groove head position by molten iron can be avoided, and the damage to the groove head caused by residual dripping and dripping can be avoided, reducing the frequency of renovation of the groove head position; the fixed flow channel 6 also adopts the method of downward discharge of molten iron through the second-order guide hole 9, so that the fixed flow channel 6 is used as a "middle bag" in actual use, which has the advantages of stabilizing the molten iron flow rate, convenient and quick replacement and extending the service life.

Claims

1. A flow control system for molten iron in a blast furnace, characterized in that: It includes a branch ditch, a molten iron collection area is arranged at the end of the branch ditch, at least one first-order guide hole is arranged at the bottom of the molten iron collection area, the center line of the first-order guide hole is perpendicular to the horizontal plane, a fixed flow groove is arranged directly below the first-order guide hole, a stabilizer prefabricated block is arranged inside the fixed flow groove, and the molten iron flowing out of the upper molten iron guide hole can flow to the surface of the stabilizer prefabricated block.

2. The flow guiding and controlling system for molten iron in a blast furnace according to claim 1, characterized in that: A molten iron blocking block is provided at the end of the branch ditch.

3. The flow guiding and controlling system for molten iron in a blast furnace according to claim 2, characterized in that: The cross-section shape of the molten iron blocking block is a semi-arc structure.

4. The flow guiding and controlling system for molten iron in a blast furnace according to claim 1, characterized in that: The upper plane of the molten iron collection area is lower than the bottom plane of the branch ditch.

5. The flow guiding and controlling system for molten iron in a blast furnace according to claim 1, characterized in that: At least one first seat brick is fixed at the bottom of the molten iron collection area, and a first-order guide hole is opened at the center position of the seat brick.

6. A flow guiding and controlling system for molten iron in a blast furnace according to claim 5, characterized in that: The first brick is machine pressed or cast prefabricated.

7. The flow guiding and controlling system for molten iron in a blast furnace according to claim 1, characterized in that: The fixed flow channel is a central concave structure, the flow stabilizer prefabricated block is installed at the center of the fixed flow channel, and second bricks are installed on both sides of the interior of the fixed flow channel, and a second-order guide hole is opened in the center of the second brick.

8. The flow guiding and controlling system for molten iron in a blast furnace according to claim 7, characterized in that: Molten iron flow control mechanisms for achieving flow control and on-off effects are installed at the positions of the first-order guide holes and the second-order guide holes.

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