Furnace-front tapping channel of blast furnace
By setting up temporary slag ditch and sand dam structures at the small wells in front of the blast furnace, problems such as blockage of debris, slag inlet of iron tanks, freezing of slag aisle and excessive molten outflow in the existing technology have been solved, and the efficiency and safety of iron output have been improved.
Patent Information
- Application Number
- CN202422030560.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-21
AI Technical Summary
After repair, the iron drainage in front of the existing blast furnace is prone to problems such as debris blockage, slag inlet of the iron tank, freezing of the slag slipper corridor, and excessive molten outflow of the iron, which affects the efficiency of iron output.
A kind of iron trench was designed in front of blast furnace furnace. By setting up temporary slag trench at the small well, a second sand dam was dug when the slag was first brought to make the slag flow into the temporary slag trench to ensure the unobstructed passage of the slag skimmer; when the slag came, the third sand dam was dug to overflow the iron into the ridge ditch to prevent slag from freezing and overslag.
It effectively solves the problem of slag coming first when opening the mouth, prevents the slag from freezing through the ridge ditch and small well slag, and improves the efficiency and safety of iron production.
Smart Images
Figure CN223033406U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of iron and steel smelting, in particular to a tapping trough in front of a blast furnace. Background Art
[0002] The tapping trough is an important part of the blast furnace ironmaking system. It is cast with refractory materials, and its structure mainly includes a main trough, a skimmer and a runner. The main trough is used to transport the mixture of high-temperature molten iron and slag away from the blast furnace. When reaching the end of the main trough, this mixture will be divided into upper-layer slag and lower-layer molten iron due to different densities. At this time, the molten iron flows out from below the skimmer and enters the runner, and the slag flows into the slag trough from above the skimmer. Due to the mechanical scouring, chemical erosion and high-temperature action of the molten iron, when the amount of molten iron passing through reaches a certain level, the refractory material will be eroded by the molten iron and become thinner, cracked, etc., and then it needs to be cast again. Due to the long time without tapping, when tapping again, the iron notch is prone to spatter, and there are many challenges for the first furnace of the new trough to pass through the skimmer: 1. There are many sundries in the trough after repairing the trough, which may block the passage of the skimmer during tapping; 2. If slag comes to the iron notch first, it may cause the slag to enter the molten iron ladle; 3. If the iron notch is blocked and the tapping is intermittent, be careful that the passage of the skimmer freezes; 4. If the iron notch is too shallow and the flow is large, due to the narrowness of the new trough, be careful that the molten iron flows onto the furnace platform.
[0003] In view of this, it is necessary to improve the existing structure of the tapping trough in front of the furnace to improve the tapping efficiency. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a tapping trough in front of a blast furnace.
[0005] The technical solution to achieve the purpose of the utility model is: a tapping trough in front of a blast furnace, which includes a main trough, a skimmer and a runner. The main trough has a front end and a rear end. The front end is communicated with the tapping notch. The skimmer is installed in the main trough and is arranged close to the rear end. A small well is formed between the skimmer and the rear end. The small well is communicated with the runner. A first slag outlet is opened on the side of the main trough, and the first slag outlet is located at the front end of the skimmer. The first slag outlet is communicated with the main slag trough; a second slag outlet is opened above the side of the small well, and a temporary slag trough is arranged between the second slag outlet and the main slag trough. A first sand dam for blocking the first slag outlet is piled at the first slag outlet, a second sand dam for blocking the second slag outlet is piled at the second slag outlet, and a third sand dam for isolating the main trough from the runner is piled between the rear end and the runner.
[0006] Furthermore, a fourth sand dam is piled on the top of the groove wall of the main trough. To prevent the molten iron from flowing out of the main trough too much and causing accidents.
[0007] The blast furnace front trough realized by the present utility model is provided with a temporary slag trough at the small well. When slag comes first, the second sand dam above the small well can be dug open, and the slag flows out through the temporary slag trough to ensure the smooth passage of the skimmer aisle. When the molten iron comes, the third sand dam is dug open again, and the molten iron overflows into the ridge trough. Thus, the problem of slag coming first when opening the mouth is effectively solved, preventing slag from flowing through the ridge trough and preventing the slag on the small well from freezing due to the long time without molten iron. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 is a top view structural schematic diagram of the blast furnace front tapping trough according to an embodiment of the present utility model;
[0009] Figure 2 is a right-side partial perspective structural schematic diagram of the blast furnace front tapping trough according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0010] The following will describe in detail the preferred embodiments of the present utility model with reference to the accompanying drawings.
[0011] As Figure 1 shown, a blast furnace front tapping trough includes a main trough 1, a skimmer 2 and a ridge trough 3. The main trough 1 has a front end 11 and a rear end 12. The front end 11 is communicated with a tapping hole (not shown). The skimmer 3 is installed in the main trough 1 and is arranged close to the rear end 12. A small well 13 is formed between the skimmer 3 and the rear end 12. The small well 13 is communicated with the ridge trough 3. A first slag outlet 14 is opened on the side surface of the main trough 1. The first slag outlet 14 is located at the front end of the skimmer 2. The first slag outlet 14 is communicated with a main slag trough 4. A second slag outlet 15 is opened above the side surface of the small well 13. A temporary slag trough 5 is arranged between the second slag outlet 15 and the main slag trough 4. A first sand dam 6 for blocking the first slag outlet is piled at the first slag outlet 14. A second sand dam 7 for blocking the second slag outlet is piled at the second slag outlet 15. A third sand dam 8 for isolating the main trough 1 from the ridge trough 3 is piled between the rear end 12 and the ridge trough 3. A fourth sand dam 9 is piled on the top 16 of the groove wall of the main trough 1.
[0012] The working principle of the blast furnace front tapping trough realized in this embodiment is as follows:
[0013] 1) If the molten iron comes first, after the molten iron in the small well is full, use an iron rake to dig open the third sand dam from the small well to the ridge trough;
[0014] 2) When slag comes first, the second sand dam above the small well is dug first. The slag flows into the main slag ditch through the temporary slag ditch from the second slag discharge port to ensure the smooth passage of the skimmer. When iron comes, the third sand dam is dug, and the molten iron overflows into the trough. Thus, the problem of slag coming first when opening is effectively solved, preventing slag from flowing through the trough and preventing the slag on the small well from freezing due to no iron coming for a long time.
[0015] The temporary slag ditch described in the present utility model is formed by piling yellow sand; the fourth sand dam is set as required, and the height of the fourth sand dam is about 15 cm, which can increase the molten iron capacity of the main ditch to prevent the molten iron from flowing out of the main ditch due to being too large and causing accidents; in the present utility model, the terms "first", "second", "third", and "fourth" are only used to distinguish the same structural parts in different positions and cannot be understood as indicating or implying relative importance.
[0016] The above is only the embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent process transformation made by using the content of the specification of the present utility model, or directly or indirectly applied in other related technical fields, is similarly included in the patent protection scope of the present utility model.
Claims
1. A blast furnace front iron tapping channel, characterized in that: It includes a main ditch, a slag skimmer and a ridge ditch. The main ditch has a front end and a rear end. The front end is connected to the iron outlet. The slag skimmer is installed in the main ditch and is arranged close to the rear end. A small well is formed between the slag skimmer and the rear end, and the small well is connected to the ridge ditch. A first slag outlet is opened on the side of the main ditch, and the first slag outlet is located at the front end of the slag skimmer, and the first slag outlet is connected to the main slag ditch; a second slag outlet is opened above the side of the small well, and a temporary slag ditch is opened between the second slag outlet and the main slag ditch. A first sand dam for blocking the first slag outlet is piled at the first slag outlet, and a second sand dam for blocking the second slag outlet is piled at the second slag outlet. A third sand dam is piled between the rear end and the ridge ditch to isolate the main ditch from the ridge ditch.
2. The blast furnace front iron tapping channel according to claim 1, characterized in that: A fourth sand dam is piled on the top of the ditch wall of the main ditch.