A blast furnace front three-way junction molten slag flow guide structure and a flow guide method

Abstract

The present application relates to the technical field of blast furnace slag discharge, and discloses a blast furnace front three-way junction molten slag confluence guide structure and a guide method; the molten slag confluence guide structure comprises a first dry slag channel, a second dry slag channel and a water slag channel which are connected to form a Y-shaped three-way junction in a confluence area; a guide plowshare is arranged at the end of a partition body between the two dry slag channels and protrudes towards the confluence area; a first guide surface and a second guide surface on the two sides of the guide plowshare are connected to the first side wall and the second side wall of the confluence area, respectively, to form a first guide channel and a second guide channel corresponding to the dry slag channel and the water slag channel; the two guide surfaces gradually approach each other in the direction towards the water slag channel and are connected at the downstream end to form a plowshare end; when the slag is discharged, the corresponding molten slag flows through the corresponding guide channel and is deflected towards the water slag channel before reaching the opposite channel wall, thereby reducing the concentrated impact and wear of the opposite channel wall of the three-way junction.

Description

Technical Field

[0001] This invention relates to the field of blast furnace slag discharge technology, specifically to a blast furnace front three-way slag confluence and guiding structure and guiding method. Background Technology

[0002] During continuous blast furnace production, two dry slag ditches are usually set up in front of the furnace, corresponding to the two tapholes respectively. The two dry slag ditches merge into the same water slag ditches downstream, and the junction of the two dry slag ditches and the water slag ditches forms a three-way intersection in front of the furnace.

[0003] In the existing three-way junction at the furnace front, the separation section between the two dry slag channels usually ends at the front end of the confluence zone. The end of the separation section facing the water slag channel lacks a guiding structure that can continue the boundary of the molten slag flow. When slag is discharged from one of the dry slag channels, the molten slag flow is affected by the original direction of movement and inertia, and is likely to cross the middle of the confluence zone and concentrate on impacting the opposite side wall of the channel connected to the other dry slag channel. When slag is discharged from the other dry slag channel, there is also an impact from the opposite side in the opposite direction. The above-mentioned alternating concentrated impacts will accelerate the erosion and wear of the working lining of the three-way junction channel wall, increase the frequency of maintenance of the three-way junction, and may affect the normal iron tapping of the blast furnace due to the long maintenance time. Summary of the Invention

[0004] The technical objective of this invention is to constrain the movement path of the molten slag flow output from either of the two dry slag channels within the confluence area of ​​the three-way junction in front of the furnace, so that the molten slag flow turns to the water slag channel before reaching the opposite channel wall, thereby reducing the concentrated impact and wear on the opposite channel wall.

[0005] To achieve the above-mentioned technical objectives, the present invention provides the following technical solution: This invention provides a blast furnace front three-way slag confluence and guiding structure, including a first dry slag ditch, a second dry slag ditch, and a water slag ditch. The downstream ends of the first and second dry slag ditches are connected to the upstream end of the water slag ditch in the confluence area to form a Y-shaped three-way intersection. A separator is provided between the first and second dry slag ditches. The confluence area has a first sidewall connected to the first dry slag ditch and a second sidewall connected to the second dry slag ditch. The end of the separator facing the water slag ditch is provided with a guide tip protruding into the confluence area. The guide tip has a first guide surface and a second guide surface adjacent to the first and second dry slag ditches, respectively. A first guide channel connecting the first dry slag ditch and the water slag ditch is formed between the first guide surface and the first sidewall. A second guide channel connecting the second dry slag ditch and the water slag ditch is formed between the second guide surface and the second sidewall. The first and second guide surfaces gradually approach each other in the direction towards the water slag ditch and connect at the downstream end to form a tip.

[0006] Furthermore, the guide plow tip is triangular in plan view, with the side of the triangle facing the separator forming a connection end that connects with the end of the separator, and the apex of the triangle facing the slag ditch forming the plow tip.

[0007] Furthermore, the two ends of the connecting end are respectively connected to the two sides of the partition, and the first guide surface and the second guide surface extend from the corresponding end of the connecting end to the tip of the plowshare, so that the two sides of the partition extend continuously downstream through the corresponding guide surfaces.

[0008] Furthermore, the first and second guiding channels are separated by a guiding beacon tip upstream of the beacon tip, and are interconnected downstream of the beacon tip and together connected to the upstream end of the slag ditch. The beacon tip is located between the two side walls of the slag ditch and faces the extension direction of the slag ditch.

[0009] Furthermore, the first dry slag ditch and the second dry slag ditch are respectively connected to the first and second tapholes of the same blast furnace to adapt to the slag discharge arrangement of the double tapholes in front of the blast furnace.

[0010] The present invention also provides a method for guiding molten slag at the three-way junction of a blast furnace. The end of the separator facing the slag ditch is provided with a guide tip protruding towards the confluence area. The first guide surface of the guide tip and the first sidewall form a first guide channel, and the second guide surface of the guide tip and the second sidewall form a second guide channel. The two guide surfaces gradually approach each other along the direction towards the slag ditch and connect at the downstream end to form a tip. When slag is discharged from the first dry slag ditch, the first molten slag flow output from the first dry slag ditch is allowed to enter the slag ditch through the first guide channel. When slag is discharged from the second dry slag ditch, the second molten slag flow output from the second dry slag ditch is allowed to enter the slag ditch through the second guide channel.

[0011] Furthermore, when slag is discharged from the first dry slag ditch, the first molten slag flow is constrained by the first guiding surface and deflected towards the water slag ditch before reaching the second sidewall, and enters the water slag ditch along the extension direction of the water slag ditch after passing the plow tip. When slag is discharged from the second dry slag ditch, the second molten slag flow is constrained by the second guiding surface and deflected towards the water slag ditch before reaching the first sidewall, and enters the water slag ditch along the extension direction of the water slag ditch after passing the plow tip.

[0012] Furthermore, the first dry slag ditch and the second dry slag ditch are respectively connected to the first and second tapholes of the same blast furnace. When the first taphole taps out iron alone, the first molten slag flow output from the first dry slag ditch enters the water slag ditch through the first guide channel. When the second taphole taps out iron alone, the second molten slag flow output from the second dry slag ditch enters the water slag ditch through the second guide channel.

[0013] The beneficial effects of this invention are as follows: 1. The present invention extends the flow boundary between two dry slag channels by extending the guide tip protruding from the end of the separator towards the confluence area, so that the molten slag flow output from any dry slag channel enters the corresponding guide channel and deflects into the water slag channel before reaching the opposite channel wall, thereby structurally reducing the concentrated impact of the molten slag flow on the opposite channel wall.

[0014] 2. The first and second guiding surfaces of the present invention are respectively provided with a first guiding channel and a second guiding channel upstream of the plowshare tip, and the two guiding channels are connected to the same water slag ditch downstream of the plowshare tip, so as to maintain the relatively independent guiding of the two dry slag ditches and not change the overall process layout in which the two converge into the same water slag ditch downstream.

[0015] 3. The guide tip of the present invention can be set at the end of the existing separator during the maintenance of the three-way junction in front of the furnace. It is suitable for the working conditions where the two dry slag channels corresponding to the double iron tap are discharged alternately or separately. It helps to reduce the local erosion of the working lining of the three-way junction channel wall and extend the maintenance interval. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] The above and other aspects of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Figure 1 This is a top view of the overall structure of the present invention; Figure 2 This is a partially enlarged schematic diagram of the guide plowshare tip and the guide channels on both sides of the present invention; Figure 3 This is a schematic diagram showing the flow guidance of the first molten slag flow when the first dry slag ditch is discharged according to the present invention; Figure 4 This is a schematic diagram showing the flow guidance of the second molten slag flow during the discharge of slag from the second dry slag ditch according to the present invention.

[0018] In the diagram: 1. First dry slag ditch; 2. Second dry slag ditch; 3. Water slag ditch; 4. Confluence zone; 5. Separator; 6. Guide plow tip; 61. First guide surface; 62. Second guide surface; 63. Plow tip; 7. First sidewall; 8. Second sidewall; 9. First guide channel; 10. Second guide channel; 11. First molten slag flow; 12. Second molten slag flow. Detailed Implementation

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] The dry slag ditch referred to in this invention is a ditch in front of the blast furnace used to transport molten slag before it enters the water quenching process to the water slag ditch. The medium being guided in the dry slag ditch is molten slag that has not yet been water quenched, and therefore the flow state of this medium is called molten slag flow.

[0021] In this invention, the direction in which molten slag flows from the first dry slag ditch 1 or the second dry slag ditch 2 to the water slag ditch 3 is taken as the downstream direction, and the opposite direction is taken as the upstream direction. The first and second are only used to distinguish the corresponding ditch body, sidewall, guide surface, guide channel and molten slag flow, and do not indicate the order or importance.

[0022] like Figure 1 and Figure 2 As shown, the blast furnace front three-way slag confluence guiding structure of this embodiment includes a first dry slag ditch 1, a second dry slag ditch 2 and a water slag ditch 3. The downstream end of the first dry slag ditch 1 and the downstream end of the second dry slag ditch 2 are connected to the confluence area 4 from two directions. The upstream end of the water slag ditch 3 extends downstream from the confluence area 4. The three are connected to form a Y-shaped three-way intersection.

[0023] A separator 5 is provided between the first dry slag ditch 1 and the second dry slag ditch 2. The separator 5 extends along the area between the two dry slag ditches and has an end facing the water slag ditch 3. The outer boundary of the confluence area 4 includes a first sidewall 7 connected to the first dry slag ditch 1 and a second sidewall 8 connected to the second dry slag ditch 2.

[0024] The end of the separator 5 facing the slag ditch 3 is provided with a guide tip 6 protruding towards the confluence area 4. The guide tip 6 is triangular in the top view. The side of the triangle facing the separator 5 serves as the connecting end and connects with the end of the separator 5. The vertex of the triangle facing the slag ditch 3 forms the tip 63.

[0025] The guide tip 6 forms a first guide surface 61 on the side adjacent to the first dry slag ditch 1 and a second guide surface 62 on the side adjacent to the second dry slag ditch 2. The two ends of the connecting end are respectively connected to the two sides of the separator 5. The first guide surface 61 and the second guide surface 62 extend from the corresponding end of the connecting end in the direction toward the water slag ditch 3 and gradually approach each other, and connect at the downstream end to form a guide tip 63, so that the two sides of the separator 5 continue to extend downstream of the confluence area 4 through the guide tip 6.

[0026] A first guiding channel 9 is formed between the first guiding surface 61 and the first side wall 7, and the first guiding channel 9 connects the first dry slag ditch 1 and the water slag ditch 3. A second guiding channel 10 is formed between the second guiding surface 62 and the second side wall 8, and the second guiding channel 10 connects the second dry slag ditch 2 and the water slag ditch 3.

[0027] The first guide channel 9 and the second guide channel 10 are separated by the guide beacon tip 6 upstream of the beacon tip 63, and are interconnected downstream of the beacon tip 63 and jointly connected to the upstream end of the slag ditch 3. The beacon tip 63 is located between the two side walls of the slag ditch 3 and faces the extension direction of the slag ditch 3.

[0028] In the furnace front arrangement of a double taphole blast furnace, the first dry slag ditch 1 and the second dry slag ditch 2 can be connected to the first taphole and the second taphole of the same blast furnace respectively. The guide plow tip 6 is set at the end of the separator 5 shared by the two dry slag ditches, so that the two dry slag ditches have a constrained channel leading to the same water slag ditch 3.

[0029] In this embodiment, the first dry slag ditch 1 and the second dry slag ditch 2 are respectively connected to the first taphole and the second taphole of the same blast furnace. When the first taphole taps out iron alone, the first molten slag flow 11 is output from the first dry slag ditch 1, and when the second taphole taps out iron alone, the second molten slag flow 12 is output from the second dry slag ditch 2.

[0030] like Figure 3 As shown, when the first dry slag ditch 1 discharges slag alone, the first molten slag flow 11 output from the first dry slag ditch 1 enters the first guide channel 9 between the first side wall 7 and the first guide surface 61. The first guide surface 61 restricts the first molten slag flow 11 from continuing to cross the confluence area 4 laterally before it reaches the second side wall 8, and gradually guides its movement direction toward the water slag ditch 3.

[0031] The first molten slag flow 11 bypasses the plow tip 63 along the first guide channel 9 and enters the downstream connected area of ​​the plow tip 63, and then flows along the extension direction of the slag ditch 3, thereby avoiding the first molten slag flow 11 directly impacting the second sidewall 8 according to its original inertial path.

[0032] like Figure 4 As shown, when the second dry slag ditch 2 discharges slag alone, the second molten slag flow 12 output from the second dry slag ditch 2 enters the second guide channel 10 between the second side wall 8 and the second guide surface 62. The second guide surface 62 restricts the second molten slag flow 12 from continuing to cross the confluence area 4 laterally before it reaches the first side wall 7, and gradually guides its movement direction toward the water slag ditch 3.

[0033] The second molten slag flow 12 bypasses the plow tip 63 along the second guide channel 10 and enters the downstream connected area of ​​the plow tip 63, and then flows along the extension direction of the slag ditch 3, thereby avoiding the second molten slag flow 12 directly impacting the first sidewall 7 according to the original inertial path.

[0034] Based on the above correspondence, when the first dry slag ditch 1 discharges slag, the first guide channel 9 undertakes the guiding function of the first molten slag flow 11, and when the second dry slag ditch 2 discharges slag, the second guide channel 10 undertakes the guiding function of the second molten slag flow 12. The two working conditions respectively utilize the guide surface on one side of the guide plow tip 6 to complete the turning and merge into the same water slag ditch 3 downstream of the plow tip 63.

[0035] This embodiment can be implemented during the maintenance of the three-way junction in front of the furnace. While maintaining the overall positional relationship between the first dry slag ditch 1, the second dry slag ditch 2, the water slag ditch 3 and the existing separator 5, a guide tip 6 protruding towards the confluence area 4 is formed at the end of the separator 5 facing the water slag ditch 3, and a first guide channel 9 and a second guide channel 10 are left on both sides to allow the corresponding molten slag flow to pass through.

[0036] The actual length, width, vertical height, and included angle between the two guide surfaces of the guide tip 6 can be matched by technicians in the relevant technical field based on the existing three-way intersection's trench width, separator dimensions, normal slag flow range, and maintenance and construction conditions, so as to meet the requirements that the guide tip 63 is located between the two side walls of the slag ditch 3, the two guide channels remain connected, and the guide tip can effectively constrain the normal molten slag flow.

[0037] In actual production, the flow diversion scheme of the present invention has been used for the maintenance of the three-way junctions in front of two blast furnaces. After application, the maintenance frequency of the relevant parts has been reduced from about once a day to about once a week. Field results show that by changing the movement path of the molten slag flow in the confluence zone 4, the local erosion of the side channel wall can be slowed down. The specific maintenance interval will vary depending on the furnace condition, slag volume, working lining condition and maintenance standards.

[0038] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

[0039] Although one or more exemplary embodiments of this disclosure have been described with reference to the accompanying drawings, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims.

[0040] The foregoing description is merely illustrative of this disclosure, and modifications may be made to the invention in light of the above detailed description. The terminology used in the appended claims should not be construed as limiting the invention to the specific embodiments disclosed in the specification. Rather, the scope of the invention will be fully defined by the appended claims, which will be interpreted according to established principles of claim interpretation.

Claims

1. A blast furnace front three-way slag confluence and guiding structure, comprising a first dry slag ditch, a second dry slag ditch, and a water slag ditch, wherein the downstream ends of the first dry slag ditch and the second dry slag ditch are connected to the upstream end of the water slag ditch in a confluence area to form a Y-shaped three-way intersection, a separator is provided between the first dry slag ditch and the second dry slag ditch, and the confluence area has a first sidewall connected to the first dry slag ditch and a second sidewall connected to the second dry slag ditch, characterized in that, The end of the separator facing the slag ditch is provided with a guide tip protruding into the confluence area. The guide tip has a first guide surface and a second guide surface that are respectively adjacent to the first dry slag ditch and the second dry slag ditch. A first flow channel is formed between the first flow guide surface and the first sidewall, connecting the first dry slag ditch and the water slag ditch. A second flow channel is formed between the second flow guide surface and the second sidewall, connecting the second dry slag ditch and the water slag ditch; The first guide surface and the second guide surface gradually approach each other along the direction toward the slag ditch and meet at the downstream end to form a plowshare tip.

2. The slag confluence and guiding structure at the three-way junction of the blast furnace as described in claim 1, characterized in that, The guide plow tip is triangular in plan view. The side of the triangle facing the separator forms a connection end that connects with the end of the separator, and the vertex of the triangle facing the slag ditch forms the plow tip.

3. The blast furnace front three-way slag confluence and guiding structure according to claim 2, characterized in that, The two ends of the connecting end are respectively connected to the two sides of the separator, and the first guide surface and the second guide surface extend from the corresponding end of the connecting end to the tip of the plowshare.

4. The slag confluence and guiding structure at the three-way junction of the blast furnace as described in claim 3, characterized in that, The first flow channel and the second flow channel are separated by the flow guiding beacon tip upstream of the beacon tip, and are interconnected downstream of the beacon tip and are connected together to the upstream end of the slag ditch. The beacon tip is located between the two side walls of the slag ditch and faces the extension direction of the slag ditch.

5. The slag confluence and guiding structure at the three-way junction of the blast furnace as described in claim 1, characterized in that, The first dry slag ditch and the second dry slag ditch are respectively connected to the first and second tapholes of the same blast furnace.

6. A method for guiding molten slag flow at a three-way junction in front of a blast furnace, wherein the three-way junction includes a first dry slag ditch, a second dry slag ditch, and a water slag ditch, wherein the downstream ends of the first dry slag ditch and the downstream ends of the second dry slag ditch are connected to the upstream end of the water slag ditch in a confluence area to form a Y-shaped junction, and a separator is provided between the first dry slag ditch and the second dry slag ditch, characterized in that, The separator has a guide tip protruding towards the confluence area at its end facing the slag ditch. A first guide surface of the guide tip forms a first guide channel connecting the first dry slag ditch and the slag ditch between the first guide surface and the first sidewall in the confluence area that connects to the first dry slag ditch. A second guide channel connecting the second dry slag ditch and the slag ditch between the second guide surface and the second sidewall in the confluence area that connects to the second dry slag ditch between the first guide surface and the slag ditch. The first guide surface and the second guide surface gradually approach each other along the direction towards the slag ditch and meet at the downstream end to form a tip. When slag is discharged from the first dry slag ditch, the first molten slag flow output from the first dry slag ditch enters the slag ditch through the first guide channel. When slag is discharged from the second dry slag ditch, the second molten slag flow output from the second dry slag ditch enters the slag ditch through the second guide channel.

7. The slag diversion method at the three-way junction in front of the blast furnace according to claim 6, characterized in that, When slag is discharged from the first dry slag ditch, the first molten slag flow is constrained by the first guide surface and deflected towards the water slag ditch before reaching the second sidewall, and enters the water slag ditch along the extension direction of the water slag ditch after passing the plowshare tip; when slag is discharged from the second dry slag ditch, the second molten slag flow is constrained by the second guide surface and deflected towards the water slag ditch before reaching the first sidewall, and enters the water slag ditch along the extension direction of the water slag ditch after passing the plowshare tip.

8. The slag diversion method at the three-way inlet of the blast furnace according to claim 7, characterized in that, The first dry slag ditch and the second dry slag ditch are respectively connected to the first taphole and the second taphole of the same blast furnace; when the first taphole taps out iron alone, the first molten slag flow output from the first dry slag ditch is allowed to enter the water slag ditch through the first guide channel; when the second taphole taps out iron alone, the second molten slag flow output from the second dry slag ditch is allowed to enter the water slag ditch through the second guide channel.

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