Safety early warning device for main iron runner
By pre-embedding permeable prefabricated components and connecting them to an air source in the lining of the main iron trough, and using air bubbles to monitor refractory erosion, the problem of difficulty in predicting the residual thickness of refractory was solved, and automatic early warning when refractory consumption reached its limit was achieved, thus improving the safety and production stability of blast furnace ironmaking.
Patent Information
- Application Number
- CN202520008214.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-03
AI Technical Summary
Existing technologies make it difficult to accurately predict the residual thickness of the refractory lining inside the main iron trough during blast furnace ironmaking, especially in the iron drop area, which leads to rapid refractory erosion and potential safety hazards.
A permeable prefabricated component is pre-embedded in the lining of the main iron trough. It is connected to the air supply channel and air source, and uses compressed air to generate bubbles in the molten iron to monitor the corrosion of the refractory material. Combined with pressure monitoring gauges and sensors, automatic early warning is achieved.
It enables timely warnings when refractory material is consumed to the safety limit, improving the safety and production stability of the main iron ditch and reducing the uncertainty of manual inspection.
Smart Images
Figure CN223607306U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of blast furnace ironmaking, in particular to a main iron runner safety early warning device. BACKGROUND
[0002] The main iron runner is the main channel for conveying high-temperature molten iron and slag in the blast furnace ironmaking process and is composed of a steel shell and a refractory lining. In the slag-iron drop point area of the main iron runner, the slag-iron flow rate is fast and vortexes are prone to occurring. The fast flow rate and vortexes of the slag-iron result in a relatively fast erosion rate of the refractory lining in the drop point area, which is the most concerned part of the entire main iron runner. The refractory lining in the iron line and slag line positions of this part is eroded particularly fast, so accurately warning the safe residual thickness of the refractory lining in the iron line and slag line positions of the drop point area is the key to the safe production of the blast furnace main iron runner. At present, the residual thickness of the refractory lining is estimated by two methods, i.e., manual exploration with a metal tube and monitoring the lining temperature with a thermocouple.
[0003] Most of the main iron runners are currently iron storage type main iron runners, so when manually exploring the residual thickness of the main iron runner, the main iron runner stores high-temperature molten iron and slag, the environment is very harsh, and the operating personnel cannot observe the residual thickness of the iron line and slag line positions with the naked eye. They can only explore the refractory lining by inserting a metal tube below the molten iron liquid surface, so the exploration result may have deviations, and the key exploration position is the drop point area.
[0004] Monitoring the lining temperature of the main iron runner by arranging a thermocouple in the permanent layer of the main iron runner or on the steel shell and inversely deducing the residual thickness of the working lining of the main iron runner through the temperature is the mainstream method currently used in modern blast furnaces. However, the lining of the main iron runner expands during the working process and vibrates during the disintegration of the old refractory lining, so the thermocouple is easily damaged and thus cannot play a monitoring role, and it is difficult to replace, so the final result still depends on manual exploration. UTILITY MODEL CONTENTS
[0005] Therefore, the technical problem to be solved by the utility model is to provide a main iron runner safety early warning device that is embedded in the lining of the main iron runner and can timely warn when the refractory lining of the working layer of the main iron runner is consumed to the limit of the safe residual thickness.
[0006] In order to solve the above technical problems, the utility model provides technical scheme as follows: A kind of main iron channel safety early warning device, including working layer refractory, permanent layer refractory and air-permeable prefabricated part, the working layer refractory is shaped on the inner side wall surface of the permanent layer refractory, molten iron runner is arranged in the working layer refractory, the first end of the air-permeable prefabricated part is inserted into the working layer refractory and extends towards the direction of the molten iron runner, and the first end of the air-permeable prefabricated part is located at the minimum residual thickness position of the working layer refractory;Air supply channel is arranged in the air-permeable prefabricated part, one end of the air supply channel penetrates the first end of the air-permeable prefabricated part, and the other end of the air supply channel penetrates the second end of the air-permeable prefabricated part and is in fluid communication with the gas source;When the working layer refractory is eroded by molten iron to the minimum residual thickness, compressed air is discharged into the molten iron from the first end of the air-permeable prefabricated part through the air supply channel.
[0007] The air supply channel is a spiral channel, and linear channels are connected to both ends of the spiral channel.
[0008] The inner diameter of the air supply channel is 5-50 mm, and the number of spiral turns of the spiral channel is 5-30.
[0009] The air supply channel is a spiral copper pipe, a capillary tube, a diffusion core or a slit strip.
[0010] A first sealing shell is arranged on the first end of the air-permeable prefabricated part, the edge of the first sealing shell is sealingly attached to the first end of the air-permeable prefabricated part and is fixedly connected thereto, a first gas storage chamber is arranged between the first sealing shell and the end face of the first end of the air-permeable prefabricated part, and the first end of the air supply channel is in fluid communication with the first gas storage chamber. By arranging the first gas storage chamber, gas leakage occurs when any position of the top gas storage chamber is in contact with molten iron and is melted, so that the monitoring area is wider.
[0011] A second sealing shell is arranged on the second end of the air-permeable prefabricated part, the edge of the second sealing shell is sealingly attached to the second end of the air-permeable prefabricated part and is fixedly connected thereto, a second gas storage chamber is arranged between the second sealing shell and the end face of the second end of the air-permeable prefabricated part, the second end of the air supply channel is in fluid communication with the second gas storage chamber, and the second gas storage chamber is in fluid communication with the gas source.
[0012] The second sealing shell is fixedly connected with a tail pipe, one end of the tail pipe is in fluid communication with the second gas storage chamber, the other end of the tail pipe is connected with a gas supply pipe, the gas supply pipe is connected with a gas source, the gas supply pipe is sequentially provided with a flow monitoring meter, an automatic pressure boosting pump and a pressure monitoring meter along the gas flow direction, and the pressure monitoring meter is connected with a sensor in parallel.
[0013] The first gas storage chamber has a thickness of 5-30 mm in the horizontal direction, and the second gas storage chamber has a thickness of 5-30 mm in the horizontal direction.
[0014] The side edge shell is fixedly connected with the edge of the first sealing shell at one end and the edge of the second sealing shell at the other end, and the side edge shell, the first sealing shell and the second sealing shell are all made of stainless steel plates. By setting the first sealing shell made of stainless steel plates, the first gas storage chamber can be reformed by welding stainless steel plates in the future, and can be reused.
[0015] The side edge shell is fixedly connected with the edge of the first sealing shell at one end and the edge of the second sealing shell at the other end, and the side edge shell, the first sealing shell and the second sealing shell are all made of stainless steel plates. By setting the first sealing shell made of stainless steel plates, the first gas storage chamber can be reformed by welding stainless steel plates in the future, and can be reused.
[0016] The technical scheme of the utility model has the following beneficial technical effects:
[0017] By setting the gas permeable prefabricated part, when the working layer refractory is eroded to the minimum residual thickness, the compressed air is continuously discharged to generate bubbles in the molten iron, and the pressure monitoring meter can quickly play a safety warning role. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The sectional structure schematic diagram of the gas permeable prefabricated part installed in the main iron runner is shown in the utility model.
[0019] Figure 2 The sectional structure schematic diagram of the gas permeable prefabricated part is shown in the utility model.
[0020] The reference signs in the drawing are shown as follows: 1 - working layer refractory; 2 - permanent layer refractory; 3 - gas permeable prefabricated part; 4 - gas conveying passage; 5 - tail pipe; 6 - side edge shell; 61 - first sealing shell; 62 - second sealing shell; 7 - groove; 8 - second gas storage chamber; 9 - first gas storage chamber; 10 - gas supply pipe; 11 - gas source; 12 - flow monitoring meter; 13 - automatic pressure boosting pump; 14 - pressure monitoring meter; 15 - sensor; 16 - molten iron flow channel. DETAILED DESCRIPTION
[0021] The main iron runner safety early warning device in the embodiment comprises a working layer refractory 1, a permanent layer refractory 2 and a gas-permeable prefabricated part 3, the working layer refractory 1 is formed on the inner side wall surface of the permanent layer refractory 2, a molten iron flow channel 16 is arranged in the working layer refractory 1, the first end of the gas-permeable prefabricated part 3 is inserted into the working layer refractory 1 and extends towards the direction of the molten iron flow channel 16, the first end of the gas-permeable prefabricated part 3 is located at the position of the lowest residual thickness of the working layer refractory 1, the second end of the gas-permeable prefabricated part 3 penetrates through the permanent layer refractory 2 and is connected with the steel shell of the outermost layer of the main iron runner; a gas conveying channel 4 is arranged in the gas-permeable prefabricated part 3, one end of the gas conveying channel 4 penetrates through the first end of the gas-permeable prefabricated part 3, the other end of the gas conveying channel 4 penetrates through the second end of the gas-permeable prefabricated part 3 and is in fluid communication with the gas source 11; when the molten iron erodes the working layer refractory 1 to the lowest residual thickness, the compressed air is discharged into the molten iron from the first end of the gas-permeable prefabricated part 3 through the gas conveying channel 4, the gas source gas is argon, and the gas-permeable prefabricated part 3 is embedded at the slag-iron junction in the main iron runner drop point area.
[0022] The outer layer of the gas-permeable prefabricated part 3 is wrapped with a shell made of a stainless steel plate, specifically, a first sealing shell 61 is arranged on the first end of the gas-permeable prefabricated part 3, the edge of the first sealing shell 61 is sealingly and fixedly connected with the first end of the gas-permeable prefabricated part 3, a first gas storage chamber 9 is arranged between the first sealing shell 61 and the first end face of the gas-permeable prefabricated part 3, and the first end of the gas conveying channel 4 is in fluid communication with the first gas storage chamber 9; a second sealing shell 62 is arranged on the second end of the gas-permeable prefabricated part 3, the edge of the second sealing shell 62 is sealingly and fixedly connected with the second end of the gas-permeable prefabricated part 3, a second gas storage chamber 8 is arranged between the second sealing shell 62 and the second end face of the gas-permeable prefabricated part 3, the second end of the gas conveying channel 4 is in fluid communication with the second gas storage chamber 8, and the second gas storage chamber 8 is in fluid communication with the gas source 11; side edge shells 6 are wrapped and fixedly connected around the gas-permeable prefabricated part 3, one end of the side edge shell 6 is fixedly connected with the edge of the first sealing shell 61, the other end of the side edge shell 6 is fixedly connected with the edge of the second sealing shell 62, grooves 7 are formed in the side edge shell 6, and the side edge shell 6, the first sealing shell 61 and the second sealing shell 62 are all made of a stainless steel plate. The thickness of the first gas storage chamber 9 in the horizontal direction is 5-30 mm, and is preferably 6 mm; the thickness of the second gas storage chamber 8 in the horizontal direction is 5-30 mm, and is preferably 6 mm.
[0023] In actual manufacturing process, the stainless steel plates at each position on the surface of the gas-permeable preform 3 are connected to each other by welding to form a shape, and the gas-permeable preform 3 is preformed by using Al2O3-SiO2-SiC refractory castable material, and the length of the gas-permeable preform 3 is 50-1000 mm and the width is 50-1000 mm.
[0024] The middle part of the gas delivery channel 4 is a spiral channel, and a straight channel is connected to each end of the spiral channel, the straight channel at one end of the spiral channel penetrates the first end of the gas-permeable preform 3, and the straight channel at the other end of the spiral channel penetrates the second end of the gas-permeable preform 3 and is in fluid communication with the gas source 11; the inner diameter of the gas delivery channel 4 is 5-50 mm; the number of spiral turns of the spiral channel is 5-30 turns; and the gas delivery channel 4 is a spiral copper pipe, a capillary tube, a diffusion core or a slit strip. In this embodiment, the gas-permeable preform 3 is a spiral copper pipe with an inner diameter of 30 mm and 10 turns.
[0025] The second sealing shell 62 is fixedly connected with a tail pipe 5, one end of the tail pipe 5 is in fluid communication with the second gas storage chamber 8, the other end of the tail pipe 5 is connected with a gas supply pipe 10, the gas supply pipe 10 is connected with a gas source 11, the gas supply pipe 10 is sequentially provided with a flow monitoring meter 12, an automatic pressure boosting pump 13 and a pressure monitoring meter 14 along the gas flow direction, and the pressure monitoring meter 14 is connected in parallel with a sensor 15. When the working layer refractory 1 is eroded to the minimum residual thickness, the molten stainless steel first sealing shell 61 leaks, the pressure decreases, and the sensor 15 detects the decrease in pressure and outputs a signal to the automatic pressure boosting pump 13, which boosts the gas pressure to prevent the molten metal from leaking due to excessively low gas pressure.
[0026] Obviously, the above embodiments are only examples for clearly illustrating the application, and are not intended to limit the application. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the patent application claims.
Claims
1. A main runner safety early warning device, comprising a working layer refractory (1) and a permanent layer refractory (2), the working layer refractory (1) is shaped on the inner side wall surface of the permanent layer refractory (2), and a molten iron runner (16) is arranged in the working layer refractory (1), characterized in that, Also included is a gas-permeable preform (3) which is inserted into the working layer refractory (1) and extends towards the direction of the runner (16), with the first end of the gas-permeable preform (3) located at the position of the lowest residual thickness of the working layer refractory (1); a gas delivery channel (4) is arranged in the gas-permeable preform (3), with one end of the gas delivery channel (4) penetrating through the first end of the gas-permeable preform (3) and the other end of the gas delivery channel (4) penetrating through the second end of the gas-permeable preform (3) and being in fluid communication with a gas source (11); when the working layer refractory (1) is eroded by molten iron to the lowest residual thickness, compressed air is discharged from the first end of the gas-permeable preform (3) into the molten iron through the gas delivery channel (4).
2. The main ironway safety warning device according to claim 1, characterized in that, The middle part of the gas delivery channel (4) is a spiral channel, with a straight channel connected to each end of the spiral channel, the straight channel at one end of the spiral channel penetrating through the first end of the gas-permeable preform (3), and the straight channel at the other end of the spiral channel penetrating through the second end of the gas-permeable preform (3) and being in fluid communication with the gas source (11).
3. The main ironway safety warning device according to claim 2, characterized in that, The inner diameter of the gas delivery channel (4) is 5-50 mm; the number of spiral turns of the spiral channel is 5-30 turns.
4. The main ironway safety warning device according to any one of claims 1-3, characterized in that, The gas delivery channel (4) is a spiral copper pipe, a capillary tube, a diffusion core or a slit strip.
5. The main ironway safety warning device according to claim 1, characterized in that, A first sealing shell (61) is arranged on the first end of the gas-permeable preform (3), with the edge of the first sealing shell (61) sealingly and fixedly connected to the first end of the gas-permeable preform (3), a first gas storage chamber (9) being arranged between the first sealing shell (61) and the end face of the first end of the gas-permeable preform (3), and the first end of the gas delivery channel (4) being in fluid communication with the first gas storage chamber (9).
6. The main ironway safety warning device according to claim 5, characterized in that, A second sealing shell (62) is arranged on the second end of the gas-permeable preform (3), with the edge of the second sealing shell (62) sealingly and fixedly connected to the second end of the gas-permeable preform (3), a second gas storage chamber (8) being arranged between the second sealing shell (62) and the end face of the second end of the gas-permeable preform (3), the second end of the gas delivery channel (4) being in fluid communication with the second gas storage chamber (8), and the second gas storage chamber (8) being in fluid communication with the gas source (11).
7. The main ironway safety warning device according to claim 6, characterized in that, The second sealing shell (62) is fixedly connected with a tail pipe (5), one end of the tail pipe (5) is in fluid communication with the second gas storage chamber (8), the other end of the tail pipe (5) is connected with a gas supply pipe (10), the gas supply pipe (10) is connected with the gas source (11), a flow monitoring meter (12), an automatic booster pump (13) and a pressure monitoring meter (14) are arranged on the gas supply pipe (10) in sequence along the direction of gas flow, and a sensor (15) is connected in parallel to the pressure monitoring meter (14).
8. The main ironway safety warning device according to claim 6, characterized in that, The thickness of the first gas storage chamber (9) in the horizontal direction is 5-30 mm; the thickness of the second gas storage chamber (8) in the horizontal direction is 5-30 mm.
9. The main ironway safety warning device according to claim 6, characterized in that, The air-permeable preform (3) is wrapped and fixedly connected with a side edge shell (6) on all sides, one end of the side edge shell (6) is fixedly connected with the edge of the first sealing shell (61), the other end of the side edge shell (6) is fixedly connected with the edge of the second sealing shell (62), and the side edge shell (6), the first sealing shell (61) and the second sealing shell (62) are all stainless steel plates.
10. The main ironway safety warning device according to claim 9, characterized in that, The side edge shell (6) is formed with a groove (7).