Molten iron slag stopping device for blast furnace

Abstract

The utility model relates to the technical field of blast furnace smelting, and particularly discloses a blast furnace molten iron slag stopping device. The blast furnace molten iron slag stopping device comprises a device main body for limiting an aisle hole; the striker plate is obliquely arranged at the top of the device main body and is used for assisting ramming materials filled at the top of the device main body to form a new skimmer; and the small well mold is communicated with the device main body and is used for discharging the molten iron which is filtered based on the new skimmer and enters the device main body. According to the utility model, the device main body for limiting the passage hole and the small well mold are welded and connected together in advance, so that the stokehole tapping interval time is optimized, the trepanning operation treatment time during vanadium titano-magnetite smelting is greatly shortened, favorable conditions are created for high yield and low consumption of a blast furnace, the labor force is liberated, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace smelting, in particular to a molten iron slag blocking device for a blast furnace. Background Art

[0002] In the field of blast furnace smelting, molten iron from blast furnace is separated from slag by slag skimmer. Although slag and iron can be separated by slag skimmer, when the blast furnace aisle eye is used for nearly two months, the blast furnace aisle eye is enlarged by chemical erosion and physical scouring, causing the slag skimmer to lose its basic slag skimming function. In this case, part of the slag will flow into the molten iron tank with the molten iron, causing the molten iron to carry slag. As the amount of slag in the molten iron increases, it has a huge impact on the iron tank. After the molten iron with slag enters the iron tank, the slag will float on the upper part, and the slag band in the upper area of ​​the iron tank will thicken. The tank capacity is reduced, which reduces the amount of iron in the iron tank, affecting the steelmaking and iron-adding operation. At the same time, once the blast furnace iron is slag-carrying, the slag removal time of the steelmaking process will be increased, the tank repair work will increase, and the efficiency of steelmaking operations will be reduced. Utility Model Content

[0003] The main purpose of the utility model is to provide a blast furnace molten iron slag blocking device to solve the problem in the prior art that slag and iron remain in the furnace for too long, resulting in the formation of coupling objects in the furnace, causing discharge difficulties and passive blast furnace production operation, and even equipment, production and other accidents.

[0004] According to one aspect of the utility model, a blast furnace molten iron slag blocking device is provided, which specifically comprises:

[0005] a device body defining an aisle eye; and

[0006] A material baffle plate obliquely arranged on the top of the device body is used to assist the ramming material filled on the top of the device body to form a new skimmer;

[0007] A small well mold connected to the device body is used to discharge the molten iron after being filtered by the new skimmer and entering the device body.

[0008] According to an embodiment of the utility model, the material blocking plate is inclined at a preset angle at the top of the inlet end close to the device body.

[0009] According to an embodiment of the utility model, an opening connected to the outlet end of the device body is provided below the well wall side of the small well mold.

[0010] According to one embodiment of the utility model, the blast furnace molten iron slag retaining device also includes a ramming material filling area defined by the retaining plate, the upper surface of the device body and the side wall of the small well mold, which is used to fill the ramming material on the top of the device body and compact the ramming material by a rammer to form a new slag skimmer and bury the blast furnace molten iron slag retaining device in the ramming material.

[0011] According to an embodiment of the utility model, the blast furnace molten iron slag blocking device is placed at the original aisle eye that has been blown clean, and the device body is placed at a preset distance between the end of the main groove and the beginning of the iron groove.

[0012] According to an embodiment of the utility model, the height of the small well mold and the height of the material blocking plate are greater than the depth of the end of the main groove.

[0013] According to an embodiment of the utility model, the cross-sectional width of the device body is consistent with the cross-sectional width of the small well mold and is smaller than the width of the end of the main groove.

[0014] According to an embodiment of the utility model, the width of the material baffle plate is greater than the cross-sectional width of the device body and smaller than the width of the end of the main groove.

[0015] According to an embodiment of the utility model, the blast furnace molten iron slag blocking device also includes two support rods, which are arranged at the top near the inlet end of the device body and are used to support the material blocking plate.

[0016] According to an embodiment of the utility model, a round hole is respectively provided on the top of the baffle plate and on both sides of the well wall of the small well mold for cooperating with a crane for lifting.

[0017] In the technical scheme of the utility model, the device body and the small well mold that define the aisle eye are welded and connected in advance, and the blast furnace molten iron slag blocking device is prefabricated in combination with the welded material blocking plate, which greatly reduces the time for installing the mold. The commissioning of the mechanized equipment in front of the furnace changes the stupid and rough operation mode in front of the furnace in the traditional technology, and provides a new operation mode to avoid the slag iron from being in the furnace for too long, resulting in the formation of Ti-N, TiNC and other coupling substances in the furnace, causing discharge difficulties. It optimizes the iron-tapping interval time in front of the furnace, greatly shortens the processing time of the eye operation during the smelting of vanadium-titanium magnetite, creates favorable conditions for high production and low consumption of blast furnaces, liberates labor, and effectively improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A perspective view showing a blast furnace smelting device according to an embodiment of the utility model;

[0020] Figure 2 A schematic diagram showing erosion of an iron storage type main ditch skimmer;

[0021] Figure 3 Another perspective view showing a blast furnace smelting device according to an embodiment of the utility model;

[0022] Figure 4 A schematic diagram showing a blast furnace smelting device according to an embodiment of the utility model placed between the end of the main groove and the beginning of the iron groove;

[0023] Description of reference numerals:

[0024] 1. Device body; 2. Material baffle plate; 3. Small well mold; 20. Support rod; 30. Ramming material filling area; 40. Round hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In order to solve the problems in the prior art that the molten iron carries slag, causing the slag and iron to stay in the furnace for too long, resulting in the formation of coupling objects in the furnace, causing difficulty in discharge, passive blast furnace production operation and reduced smelting efficiency, etc. The utility model proposes a blast furnace molten iron slag blocking device, such as Figure 1As shown, it specifically includes: a device body that defines an aisle eye 1; and a baffle plate 2 obliquely arranged on the top of the device body, which is used to assist the ramming material filled on the top of the device body to form a new skimmer; a small well mold 3 connected to the device body 1, which is used to discharge molten iron after being filtered by the new skimmer and entering the device body 1.

[0028] Figure 2 The schematic diagram of the erosion of the iron storage type main ditch skimmer. For the iron-making plant blast furnace with a single taphole, the main ditch is cast and the non-baking ramming material is used for maintenance. The service life of the entire main ditch is about 110 days, and the iron flow can reach more than 350,000 tons. After the blast furnace aisle eye is used for nearly 2 months, it is enlarged by chemical erosion and physical scouring, and the skimmer basically loses its slag skimming function. Figure 2 As shown, the amount of slag in the molten iron increases, which has a huge impact on the iron tank. The traditional eye operation is to insert the aisle eye mold into the aisle eye that has been eroded and enlarged without destroying the slag skimmer castable, and use a specific tool to insert the ramming groove material into the gap between the mold and the original aisle eye.

[0029] In one example, the traditional eye-catching operation steps include:

[0030] Step 1: Clear the residual iron in the main trench

[0031] Step 2: Insert the aisle eye mold and fill the eroded area with ramming groove material.

[0032] Step 3: Block the residual iron holes in the main iron storage ditch when filling the ramming material.

[0033] The above-mentioned traditional eye-cutting operation steps take about 90 minutes from plugging the residual iron eye to the next burning of the residual iron eye. The long eye-cutting operation time will basically lead to suffocation and reduced air flow in the furnace. Due to the high temperature around the skimmer, the operators are directly exposed to high temperatures when inserting the aisle eye mold and using tools to pound the material. The operators must evacuate the operation point and replace the operators within 5 seconds, so that the pounding groove material fills the entire aisle eye erosion area, which causes the above-mentioned traditional eye-cutting operation to take a long time.

[0034] In one embodiment, as the smelting intensity of the blast furnace increases, the requirements for the work in front of the furnace for the single iron mouth operation also increase accordingly. It is particularly important to control the iron tapping punctuality rate. If the blast furnace eyelet operation time is long, in most cases it will cause a reduction in the air flow in the furnace, which will have a certain impact on normal production operations and enhanced smelting. Different from the traditional eyelet operation, which does not damage the castable under the gate, the mold is stuffed into the original channel and then filled with ramming groove materials. The utility model provides a blast furnace molten iron slag blocking device that welds the device body and the small well mold that define the aisle eye in advance. When the eyelet operation is performed, it is only necessary to use an excavator to beat all the original aisle eye castables, and then put them into the pre-made mold for padding. It avoids the risk of operators directly facing high temperature to install molds and fill ramming groove materials, and effectively improves the efficiency of the eyelet operation.

[0035] In one embodiment, the steps of using the molten iron slag blocking device of the utility model to perform eyelet operation include:

[0036] Step 1: Burn the residual iron hole to drain the slag and iron in the main ditch. When the original passage hole is damaged, first burn a residual iron hole under the retaining wall to drain all the slag and iron in the iron storage ditch;

[0037] Step 2: Use an excavator to quickly knock out the corroded slag skimmer castings, blow clean the original passageway of the main trench with high-pressure air, and install the prefabricated blast furnace molten iron slag retaining device. When the slag and molten iron in the iron storage trench and the main trench are drained through the residual iron eye, the original passageway can be safely dug out and the blast furnace molten iron slag retaining device can be placed in the clean blast furnace main trench.

[0038] The third step: fill the ramming groove material in the ramming material filling area of ​​the blast furnace molten iron slag retaining device, bury the blast furnace molten iron slag retaining device in the main groove of the blast furnace to form a mold, and use a rammer to tamp the ramming groove material in the ramming material filling area layer by layer to form a new slag skimmer.

[0039] Step 4: While filling the ramming material, plug the holes of the residual iron that were burned in the first step.

[0040] In the technical scheme of the utility model, the device body and the small well mold that define the aisle eye are welded and connected in advance, and the blast furnace molten iron slag blocking device is prefabricated in combination with the welded material blocking plate, which greatly reduces the time for installing the mold. The commissioning of the mechanized equipment in front of the furnace changes the stupid and rough operation mode in front of the furnace in the traditional technology, and provides a new operation mode to avoid the slag iron from being in the furnace for too long, resulting in the formation of Ti-N, TiNC and other coupling substances in the furnace, causing discharge difficulties. It optimizes the iron-tapping interval time in front of the furnace, greatly shortens the processing time of the eye operation during the smelting of vanadium-titanium magnetite, creates favorable conditions for high production and low consumption of blast furnaces, liberates labor, and effectively improves production efficiency.

[0041] According to an embodiment of the utility model, the material blocking plate is inclined at a preset angle at the top of the inlet end close to the device body.

[0042] According to an embodiment of the utility model, an opening connected to the outlet end of the device body is provided below the well wall side of the small well mold.

[0043] According to one embodiment of the utility model, the blast furnace molten iron slag retaining device also includes a ramming material filling area 30 defined by a retaining plate, the upper surface of the device body and the side wall of the small well mold, which is used to fill ramming material on the top of the device body and compact the ramming material by a rammer to form a new slag skimmer and bury the blast furnace iron molten iron slag retaining device in the ramming material.

[0044] In one embodiment, Figure 3 Another perspective view of a blast furnace smelting device according to an embodiment of the utility model is shown, Figure 3 The dotted line box portion is the ramming material filling area 30. Figure 4 The schematic diagram of the blast furnace smelting device according to the embodiment of the utility model is placed between the end of the main groove and the beginning of the iron groove. The ramming groove material is filled to the ramming material filling area 30 to fix the blast furnace smelting device to the end of the main groove ( Figure 4 The middle main ditch) and the beginning of the iron ditch ( Figure 4 The ramming material is compacted layer by layer by a tamping machine, so that the ramming material forms a retaining wall in the ramming material filling area 30, that is, a new slag skimmer, which is used to prevent slag iron from flowing into the small well mold and the iron pool in front of the retaining wall, and according to the slag iron density principle, the molten iron enters the device body under the baffle plate and goes out of the small well mold, so as to obtain molten iron after filtering the slag. Figure 4 As shown in the figure, the height of the small well mold and the height of the baffle plate are greater than the depth of the end of the main groove. The main groove nest usually refers to the part before the molten iron and slag flow through the main groove and are ready to enter the next link (such as the iron groove), that is, the end of the main groove, and the bay groove head usually refers to the part where the molten iron flows into the iron groove from the small well and starts to flow, that is, the beginning of the iron groove.

[0045] According to one embodiment of the utility model, the blast furnace molten iron slag blocking device is placed at the original aisle eye that has been cleaned by blowing, and the device body is placed at a preset distance between the end of the main groove and the beginning of the iron groove.

[0046] According to an embodiment of the utility model, the height of the small well mold and the height of the material blocking plate are greater than the depth of the end of the main groove.

[0047] According to an embodiment of the utility model, the cross-sectional width of the device body is consistent with the cross-sectional width of the small well mold and is smaller than the width of the end of the main groove.

[0048] According to an embodiment of the utility model, the width of the material blocking plate is greater than the cross-sectional width of the device body and smaller than the width of the end of the main groove.

[0049] According to an embodiment of the utility model, the blast furnace molten iron slag blocking device also includes two support rods, which are arranged at the top near the inlet end of the device body and are used to support the material blocking plate.

[0050] According to an embodiment of the utility model, a round hole 40 is respectively provided on the top of the baffle plate and on both sides of the well wall of the small well mold for cooperating with a crane for lifting.

[0051] In one embodiment, the traditional eye-catching operation mode is compared with the fast eye-catching operation mode implemented based on the present invention. As shown in Table 1, the entire eye-catching operation process is decomposed into 5 major steps, and the time spent on each step is counted separately.

[0052] Table 1

[0053]

[0054] In one embodiment, based on the above table, it can be seen that in the traditional eye-set operation mode, the skimmer castable is not destroyed, so that the skimmer is surrounded by high temperature, and the time spent when installing the mold is 3 times more than the time spent in the fast eye-set operation mode. And in the traditional eye-set operation mode, when using tools to pound materials, the operator is directly faced with high temperature, and every 5 seconds, the operator is required to evacuate the operation point and change the operation until the ramming groove material is filled with the entire aisle eye erosion area, and the fast eye-set operation mode only needs to directly fill the ramming groove material and tamp it in the ramming material filling area in the blast furnace molten iron slag retaining device of the utility model, without the need for alternating personnel, so the time spent by the fifth step of the traditional eye-set operation mode in Table 1 is 4 times more than the time spent in the fast eye-set operation mode. Although it takes 15 minutes to knock out the original skimmer castable in the fast eye-set operation mode, when the entire skimmer area space is fully opened and the blast furnace molten iron slag retaining device is reinstalled, it is only necessary to directly put the ramming groove material into the ramming material filling area, and the ramming machine tamping can complete the eye-set operation, which is the key to saving a lot of time in the fast eye-set operation. The molten iron slag blocking device of the utility model realizes the use of mechanized equipment in front of the furnace, gradually changing the stupid and rough operation mode in front of the furnace in the traditional eye-cutting operation. The new operation mode can not only liberate labor but also help improve production efficiency. As shown in Table 2, by implementing the rapid eye-cutting operation, a lot of operation time is saved while avoiding the problem of suffocation and wind reduction in the furnace, effectively reducing losses.

[0055] Table 2

[0056] Number of eye drops Number of wind reductions Number of lost batches Before implementation (half year) 4 4 16 After implementation (half year) 4 0 0

[0057] Through the technical solution of the utility model, when vanadium-titanium magnetite smelting, it is possible to avoid the slag iron from being in the furnace for too long, which will lead to the formation of Ti-N, TiNC and other coupling materials in the furnace, causing problems such as difficulty in discharge and passive blast furnace production operation, and reduce equipment or production accidents. Furthermore, the interval time of iron tapping in front of the furnace is effectively optimized, the slag iron is removed in time, and the post-processing time of the fast eye operation mode realized by the utility model is ≤40 minutes, which greatly shortens the processing time and creates favorable conditions for high production and low consumption of blast furnaces.

[0058] In one embodiment, taking the cost of a ton of iron as RMB 2,800 and the batch of iron as 14.20 tons as an example, the direct benefits after adopting the rapid eye operation mode are calculated, and the estimated annual direct benefits of a single blast furnace are 16×14.2×2800×2=127.32 (million yuan). If the rapid eye operation mode is promoted in the five blast furnaces in the plant, the estimated annual direct benefits are 127.32×5=636.16 (million yuan). The production benefits are greatly improved.

[0059] In the technical scheme of the utility model, the device body and the small well mold that define the aisle eye are welded and connected in advance, and the blast furnace molten iron slag blocking device is prefabricated in combination with the welded material blocking plate, which greatly reduces the time for installing the mold. The commissioning of the mechanized equipment in front of the furnace changes the stupid and rough operation mode in front of the furnace in the traditional technology, and provides a new operation mode to avoid the slag iron from being in the furnace for too long, resulting in the formation of Ti-N, TiNC and other coupling substances in the furnace, causing discharge difficulties. It optimizes the iron-tapping interval time in front of the furnace, greatly shortens the processing time of the eye operation during the smelting of vanadium-titanium magnetite, creates favorable conditions for high production and low consumption of blast furnaces, liberates labor, and effectively improves production efficiency.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A blast furnace molten iron slag retaining device, characterized in that: include: The main body of the device defining the eye of the aisle; as well as A material baffle plate obliquely arranged on the top of the device body is used to assist the ramming material filled on the top of the device body to form a new skimmer; A small well mold connected to the device body is used to discharge the molten iron after being filtered by the new skimmer and entering the device body.

2. The device according to claim 1, characterized in that The material blocking plate is arranged at a preset angle and is inclined at the top of the inlet end close to the device body.

3. The device according to claim 1, characterized in that An opening connected to the outlet end of the device body is arranged below the well wall side of the small well mold.

4. The device according to claim 1, characterized in that The blast furnace iron molten slag retaining device also includes a ramming material filling area defined by the retaining plate, the upper surface of the device body and the side wall of the small well mold, which is used to fill the ramming material on the top of the device body and tamp the ramming material by a rammer to form a new slag skimmer and bury the blast furnace iron molten slag retaining device in the ramming material.

5. The device according to claim 1, characterized in that The blast furnace molten iron slag blocking device is placed at the original aisle eye that has been cleaned by blowing, and the main body of the device is placed at a position with a preset distance between the end of the main groove and the beginning of the iron groove.

6. The device according to claim 1, characterized in that The height of the small well mold and the height of the material blocking plate are greater than the depth of the end of the main groove.

7. The device according to claim 1, characterized in that The cross-sectional width of the device body is consistent with the cross-sectional width of the small well mold and is smaller than the width of the end of the main groove.

8. The device according to claim 1, characterized in that The width of the baffle plate is greater than the cross-sectional width of the device body and smaller than the width of the end of the main groove.

9. The device according to claim 1, characterized in that The blast furnace molten iron slag blocking device also includes two support rods, which are arranged at the top near the inlet end of the device body and are used to support the blocking plate.

10. The device according to claim 1, characterized in that A round hole is respectively arranged on the top of the baffle plate and on both sides of the well wall of the small well mold for cooperating with a crane for lifting.

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