Blast furnace residual iron notch connecting device

Abstract

The utility model relates to a blast furnace residual iron notch connecting device which is applied to a blast furnace, the blast furnace is provided with an iron notch and a residual iron notch lower than the iron notch, the furnace wall of the blast furnace sequentially comprises a furnace shell, a cooling wall and a blast furnace inner ring carbon from outside to inside, and the blast furnace residual iron notch connecting device comprises a connecting piece and a connecting piece, the pouring body is provided with a discharge port; the residual iron runner is arranged outside the residual iron opening and contains the connecting piece, the residual iron runner is provided with a far end and a near end, the residual iron runner is obliquely arranged, the far end is lower than the near end so as to guide residual iron to flow to the far end from the near end, the near end is seamlessly connected with annular carbon in the blast furnace, and the two side walls of the residual iron runner are seamlessly connected with the furnace shell and the cooling wall on the two sides of the residual iron runner; the water baffle is arranged right above the residual iron runner so as to prevent water from dripping into the residual iron runner; the utility model solves the problem that the residual iron leaks along the gap between the residual iron runner and the furnace shell, can prevent the moisture of the blast furnace from falling into the residual iron runner, and eliminates the potential safety hazard.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace residual iron notch, in particular to a connecting device for a blast furnace residual iron notch. Background Art

[0002] When the blast furnace stops for medium repair or major repair, first use water injection to lower the burden surface to stop the furnace. After the furnace is stopped, it is necessary to cut and remove 2-4 cooling stave blocks locally on the furnace shell, and then drain the residual iron that has not been discharged through the iron notch at the bottom of the hearth. The position where the residual iron is drained is called the residual iron notch. The opening position of the residual iron notch and the setting of the residual iron groove are the keys to successfully discharging the residual iron. For large blast furnaces above 5000m 3 grade, the residual iron remaining in the hearth is about 2300-2600 tons. The design and layout of the residual iron notch and the residual iron groove are very important for cleaning up a large amount of residual iron. Otherwise, the residual iron solidifies in the hearth and is difficult to clean up separately, or the residual iron leaks along the cooling stave and the furnace shell of the blast furnace, burning out the cooling stave and water pipes, seriously affecting the entire medium repair or major repair process, and even causing serious safety accidents.

[0003] However, peer patents such as CN103215398B and CN202272894U do not specifically design the connection position between the residual iron groove and the furnace shell. This not only affects the subsequent maintenance progress but also poses serious safety hazards and cannot meet the requirements for discharging residual iron from large blast furnaces above 5000m 3 grade. Content of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the residual iron leaks along the connection position between the residual iron groove and the furnace shell in the prior art, and further provide a connecting device for a blast furnace residual iron notch, which solves the problem of leakage of the residual iron along the gap between the residual iron groove and the furnace shell and eliminates potential safety hazards.

[0005] To solve the above technical problem, the utility model provides a connecting device for a blast furnace residual iron notch, which is applied to a blast furnace. The blast furnace is provided with an iron notch and a residual iron notch arranged below the iron notch. The furnace wall of the blast furnace from outside to inside is successively a furnace shell, a cooling stave, and an inner ring carbon of the blast furnace hearth, including,

[0006] a connecting member, which includes a casting body made of refractory castable located in the residual iron notch, and the casting body is provided with a discharge port;

[0007] a residual iron groove, which is arranged outside the residual iron notch and accommodates the connecting member. The residual iron groove is provided with a distal end and a proximal end. The residual iron groove is inclined and the distal end is arranged lower than the proximal end to guide the residual iron to flow from the proximal end to the distal end. The proximal end is seamlessly connected to the inner ring carbon of the blast furnace hearth, and the two side walls of the residual iron groove are seamlessly connected to the furnace shell and the cooling stave on both sides thereof;

[0008] The water baffle is arranged directly above the residual iron runner to prevent water droplets from dripping into the residual iron runner.

[0009] In an embodiment of the present invention, the connecting member further includes a casting mold, which covers the outside of the tapping hole. The casting mold includes a bottom plate and a vertical plate. The bottom plate extends into the tapping hole to connect with the inner ring carbon of the furnace, and the vertical plate is provided with the discharge port. Refractory castable is poured into the casting mold to form the cast body.

[0010] In an embodiment of the present invention, the casting mold is provided with a casting port.

[0011] In an embodiment of the present invention, the bottom plate is connected to the residual iron runner.

[0012] In an embodiment of the present invention, the residual iron runner includes a metal shell and a refractory castable layer cast in the metal shell. The cross-sections of the refractory castable layer and the metal shell are both "concave" shaped structures.

[0013] In an embodiment of the present invention, the metal shell is welded to the casting mold.

[0014] In an embodiment of the present invention, a refractory brick lining layer is provided between the refractory castable layer and the metal shell.

[0015] In an embodiment of the present invention, the water baffle is connected to the connecting member, and the edges of the water baffle are all inclined downward.

[0016] In an embodiment of the present invention, a residual iron pit is further included, and the distal end extends to the residual iron pit.

[0017] In an embodiment of the present invention, the residual iron pit is sequentially paved with a dry steel slag block layer, a refractory brick layer, and a refractory material layer from bottom to top.

[0018] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0019] For the tapping hole connecting device of the blast furnace of the present invention, by pouring refractory castable in the tapping hole to form a cast body, the structural strength of the blast furnace at the tapping hole is strengthened. The cast body also connects the residual iron runner and the tapping hole, preventing molten iron from leaking downward along the gap between the cooling wall and the furnace shell, and avoiding potential safety hazards; by arranging a water baffle above the residual iron runner, it is avoided that the moisture in the blast furnace falls into the residual iron runner and contacts the residual iron to cause an explosion phenomenon, eliminating potential safety hazards; the residual iron runner is inclined, which is beneficial to accelerating the flow of residual iron and avoiding the solidification of residual iron; the proximal end of the residual iron runner is seamlessly connected to the inner ring carbon of the furnace, and the two side walls of the residual iron runner are seamlessly connected to the furnace shell and the cooling wall on both sides, further preventing the residual iron from penetrating into the gap between the furnace shell and the cooling wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the accompanying drawings, wherein

[0021] Figure 1 is a schematic structural diagram of a blast furnace residual iron notch connecting device except for the water baffle in a preferred embodiment of the present utility model.

[0022] Figure 2 For Figure 1 is a schematic structural diagram of a top view sectional view of the blast furnace residual iron notch connecting device shown.

[0023] Figure 3 For Figure 1 is a schematic structural diagram of a side view sectional view of the blast furnace residual iron notch connecting device shown.

[0024] Figure 4 For Figure 1 is a schematic structural diagram of the blast furnace residual iron notch connecting device with a water baffle shown.

[0025] Explanation of reference numerals in the specification drawings: 1. Connecting piece; 11. Discharge port; 2. Residual iron groove; 21. Brick lining layer of the residual iron groove; 22. Metal shell; 23. Refractory castable layer; 24. Proximal end; 25. Distal end; 3. Inner ring carbon of the blast furnace; 31. Cooling stave; 32. Furnace shell; 4. Water baffle; 41. Inclined surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0027] Embodiment

[0028] Referring to Figure 1 、 2 and Figure 4, in an embodiment of the present utility model, a blast furnace residual iron notch connecting device is applied to a blast furnace. The blast furnace is provided with an iron notch and a residual iron notch arranged below the iron notch. The furnace wall of the blast furnace is successively composed of a furnace shell 32, a cooling stave 31, and an inner ring carbon 3 of the blast furnace from outside to inside. The connecting device includes

[0029] Connecting piece 1, which includes a cast body made of refractory castable located in the slag notch. The cast body is embedded in the slag notch. It can be understood that part of the cast body is embedded in the slag notch and the other part is located outside the slag notch. The cast body is provided with a discharge port 11 that penetrates inside and outside the furnace. During casting, vibration compaction is used to ensure that the refractory castable is in close contact with the furnace shell 32, the cooling stave 31, and the inner ring carbon 3 of the blast furnace. Through casting, the gap between the slag notch and the cast body can be eliminated, preventing the leakage of residual iron from this gap. The discharge port 11 can be left by pre-burying a pipeline. Specifically, the lower length of the connecting piece 1 is 538 mm, the upper length is 300 mm, the lower width is 722 mm, the upper width is 400 mm, and the overall height is 1175 mm;

[0030] Slag runner 2, which is arranged outside the slag notch for guiding the residual iron. The cross-section of the slag runner 2 is in a "concave" shape to accommodate the connecting piece 1. The slag runner 2 is provided with a distal end 25 and a proximal end 24. The slag runner 2 is inclined and the distal end 25 is lower than the proximal end 24 to guide the residual iron to flow from the proximal end 24 to the distal end 25. The proximal end 24 is seamlessly connected to the inner ring carbon 3 of the blast furnace to eliminate the gap between the inner ring carbon 3 of the blast furnace and the slag runner 2, and the two side walls of the slag runner 2 are seamlessly connected to the furnace shell 32 and the cooling stave 31 on both sides to eliminate the gap between the furnace shell 32, the cooling stave 31, and the slag runner 2;

[0031] Water baffle 4, which is arranged directly above the slag runner 2 to block the moisture and sundries above from falling into the slag runner 2. The overall width of the lower part of the water baffle 4 is 455 mm, and the overall width of the upper part is 1300 mm. Since the blast furnace is stopped by spraying water to reduce the burden surface, there is more moisture in the furnace body. When the moisture contacts the residual iron, it may explode violently.

[0032] In an embodiment of the present invention, referring to Figure 1 and 3 As shown, in order to facilitate the casting of refractory castable, the connecting piece 1 further includes a casting mold. The casting mold covers outside the slag notch. The casting mold is a mold formed by a bottom plate and a plurality of 8-mm-thick vertical plates welded to the bottom plate. The bottom plate is set in a "T" shape structure. The extending part of the bottom plate extends into the slag notch to connect with the inner ring carbon 3 of the furnace. The vertical plate is provided with the discharge port 11. Refractory castable is poured into the casting mold and the slag notch area to form the cast body.

[0033] In an embodiment of the present invention, the casting mold is reserved with a casting opening, and the slag notch area is integrally cast with refractory castable, and vibration compaction is carried out during casting.

[0034] In an embodiment of the present invention, referring to Figure 3As shown, the bottom plate abuts against the residual iron groove 2 and is fixedly connected thereto.

[0035] In one embodiment of the present invention, referring to Figure 1 As shown, the residual iron ditch 2 includes a metal shell 22 and a refractory castable layer 23 cast in the metal shell 22. The refractory castable layer 23 is composed of refractory castables. The cross-sections of the refractory castable layer 23 and the metal shell 22 are both "concave" shaped structures. The metal shell 22 is preferably set as a steel shell.

[0036] In one embodiment of the present invention, the metal shell 22 is welded to the casting mold.

[0037] In one embodiment of the present invention, referring to Figure 1 As shown, a residual iron ditch brick lining 21 is provided between the refractory castable layer 23 and the metal shell 22, and the residual iron ditch brick lining 21 is formed by paving bricks.

[0038] In one embodiment of the present invention, referring to Figure 4 As shown, the water retaining plate 4 is connected to the casting mold of the connecting member 1, and the edges of the water retaining plate 4 are all arranged as inclined surfaces 41 inclined downward to guide water to flow to the ground.

[0039] In one embodiment of the utility model, it also includes an accident emergency scrap iron pit, and the distal end 25 extends to the scrap iron pit, which is used to cache scrap iron in accident emergency situations. Since the amount of scrap iron reaches about 2316t, in order to prevent a large amount of high-temperature scrap iron from gushing out after the scrap iron mouth is opened, the scrap iron groove 2 is not drained in time, resulting in scrap iron overflow.

[0040] In one embodiment of the utility model, the residual iron pit is paved with a dry steel slag block layer, a refractory brick layer, and a refractory material layer from bottom to top. Specifically, the pillars are used as the outer frame of the residual iron pit for the accident emergency pit. The east and west pillars are connected and reinforced with three rows of 200 channel steels. The overall width of the upper part is 6000mm, the lower width is 3080mm, the depth of the residual iron pit is 1500mm, and the two sides of the residual iron pit are set as isosceles dams. The lower angle of the isosceles dam is 55-60°, the bottom height of the dam base is 700-800mm, and the overall height is 2300mm. Dry steel slag blocks with a particle size of 5-20mm are laid at the bottom of the dam base, which are compacted and patted firmly with an excavator. A layer of refractory bricks is laid on the upper part, and then 15-20mm thick refractory material is laid. After the laying is completed, it is baked and dried 3 days in advance. Finally, 38-50mm thick dry coke powder is laid on the filling part of the residual iron pit one day before the residual iron is placed.

[0041] The working principle of the blast furnace residual iron mouth connecting device described in the utility model is:

[0042] During connection, first modify the water pipe at the position of the residual iron notch in advance. After the furnace is stopped by lowering the burden surface with water injection and the furnace shell 32 and the cooling stave 31 are cut, after removing the furnace shell 32 and the cooling stave 31 in the residual iron notch area, clean the residual ramming material between the original cooling stave 31 and the inner ring carbon 3 of the blast furnace. Weld a vertical plate with a thickness of 8 mm outside the furnace shell 32, and the bottom plate extends into the furnace to connect with the inner ring carbon 3 of the blast furnace. The bottom plate is connected to the residual iron trough 2. After the metal shells 22 of the connecting piece 1 and the residual iron trough 2 are welded, reserve a pouring port, and use refractory castable to integrally pour the residual iron notch area to form a poured body, which plays a role in connecting the residual iron notch and the residual iron trough 2. During pouring, vibrate it densely to ensure that the molten iron does not leak downward along the gaps between the cooling stave 31 and the furnace shell 32. Then, set a water baffle 4 above the connecting piece 1 to prevent sundries from falling above, affecting the construction safety, and to prevent the phenomenon of explosion when water falls on the molten iron after the residual iron notch is opened to discharge the residual iron.

[0043] During use, open the residual iron notch, and the residual iron that has not been discharged through the iron notch is discharged through the discharge port 11 and flows into the residual iron trough 2 and is discharged into the residual iron pit along the residual iron trough 2.

[0044] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A blast furnace residual iron mouth connection device, which is applied to a blast furnace, wherein the blast furnace is provided with an iron mouth and a residual iron mouth provided below the iron mouth, and the furnace wall of the blast furnace is sequentially a furnace shell, a cooling wall and an inner ring carbon of the blast furnace from the outside to the inside, characterized in that: include, A connecting piece, comprising a casting body formed by casting refractory castable material and located in the residual iron opening, wherein the casting body is provided with a discharge port; A residual iron groove is arranged outside the residual iron opening and accommodates the connecting piece. The residual iron groove is provided with a distal end and a proximal end. The residual iron groove is arranged obliquely and the distal end is arranged lower than the proximal end to guide the residual iron to flow from the proximal end to the distal end. The proximal end is seamlessly connected to the ring carbon in the blast furnace, and the two side walls of the residual iron groove are seamlessly connected to the furnace shell and the cooling wall on both sides thereof. A water retaining plate is arranged just above the residual iron groove to prevent water from dripping into the residual iron groove.

2. A blast furnace residual iron mouth connection device according to claim 1, characterized in that: The connecting piece also includes a casting mold, which is sealed outside the residual iron opening. The casting mold includes a bottom plate and a vertical plate. The bottom plate extends into the residual iron opening to connect with the ring carbon in the furnace. The vertical plate is provided with the discharge port, and refractory castables are poured into the casting mold to form the casting body.

3. A blast furnace residual iron mouth connection device according to claim 2, characterized in that: The casting mold is provided with a casting port.

4. A blast furnace residual iron mouth connection device according to claim 2, characterized in that: The bottom plate is connected to the residual iron groove.

5. A blast furnace residual iron mouth connection device according to claim 2, characterized in that: The residual iron ditch comprises a metal shell and a refractory castable layer cast in the metal shell, and the cross-sections of the refractory castable layer and the metal shell are both "concave" shaped structures.

6. A blast furnace residual iron mouth connection device according to claim 5, characterized in that: The metal shell is welded to the casting mold.

7. A blast furnace residual iron mouth connection device according to claim 5, characterized in that: A residual iron ditch brick lining is provided between the refractory castable layer and the metal shell.

8. A blast furnace residual iron mouth connection device according to claim 1, characterized in that: The water baffle is connected to the connecting piece, and the edges of the water baffle are all arranged to be inclined downward.

9. A blast furnace residual iron mouth connection device according to claim 1, characterized in that: It also includes a residual iron pit, and the distal end extends to the residual iron pit.

10. A blast furnace residual iron mouth connection device according to claim 9, characterized in that: The residual iron pit is sequentially paved with a dry steel slag block layer, a refractory brick layer and a refractory material layer from bottom to top.

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