Blast furnace stokehole swing groove baking device
By designing a swing groove baking device in front of a blast furnace and adopting a uniformly arranged combustion nozzle and regulating valve system, the problem of poor baking effect in the existing technology is solved, the service life of the swing groove is increased and the use of coke oven gas is reduced.
Patent Information
- Application Number
- CN202422648922.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing blast furnace front swing groove baking device and baking method is relatively rough, it is difficult to ensure the baking effect, resulting in refractory cracking and other quality defects, increasing safety hazards and economic losses.
A blast furnace front swing groove baking device was designed, which included a baking main pipe, combustion nozzles, supports, pressure gauges, regulating valves, check valves and gas sources. The swing grooves were efficiently baked by evenly arranged combustion nozzles, thus reducing the use of coke oven gas.
It realizes fast and convenient swing groove baking, prolongs the service life of the swing groove in front of the furnace, increases the iron throughput from 60,000 tons to 100,000-120,000 tons, and reduces the use of coke oven gas.
Smart Images
Figure CN223412482U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a swing groove baking device in front of a blast furnace, belonging to the technical field of ironmaking in the metallurgical industry. Background Art
[0002] The swing ditch in front of a blast furnace is a temporary "transfer link" connecting the support ditch in front of the blast furnace and the molten iron ladle below the furnace. It is a key equipment in the furnace front. Its main functions are as follows: molten iron from the blast furnace flows into the swing ditch through the support ditch. The swing ditch adjusts the angle of the swing ditch to allow the molten iron to flow smoothly into the molten iron ladle below the railway. Once the molten iron ladle is full, the angle of the swing ditch is adjusted to allow the molten iron to flow into the molten iron ladle on the railway in the other direction. The swing ditch not only serves as a link between the blast furnace's front ditch and the molten iron ladle below the furnace, but also has the function of allocating molten iron between ladles. The importance of the swing ditch is self-evident. Furthermore, the swing ditch operates in a harsh environment, withstanding not only the erosion and scouring of high-temperature molten iron but also the vibration and impact of the molten iron flow. Cracks, adhesion, and uneven deformation of the lining refractory material can cause molten iron to "leak" or "diverge," spilling onto the ground, potentially leading to safety accidents such as burning railway tracks and other equipment on the furnace foundation, or explosions in the presence of water. Failure of the swing nozzle prevents molten iron from being transported, forcing the blast furnace to operate at a single taphole. This can easily lead to environmental accidents and production accidents such as reduced airflow and oxygen consumption caused by blast furnace slag and iron discharge, resulting in economic losses. Therefore, improving the quality of the swing ditch in front of the blast furnace is crucial.
[0003] The swing groove in front of the blast furnace is baked by burning coke oven gas. The current baking device and baking method are relatively crude and simple, and the baking effect is difficult to guarantee. The swing groove quality defects caused by baking problems such as cracking of the swing mouth refractory often occur. Utility Model Content
[0004] The purpose of the utility model is to provide a blast furnace front swing groove baking device, which can quickly and conveniently realize the baking of the swing groove, reduce the use of coke oven gas, improve the baking effect, and solve the problems existing in the background technology.
[0005] The technical solution of the utility model is:
[0006] A blast furnace swing groove baking device comprises a swing groove, a baking main pipe, a combustion nozzle, a baking support, a pressure gauge, a regulating valve, a check valve, an air source and a baking branch pipe. The baking main pipe is fixed to the swing groove by two baking supports. The two ends of the baking main pipe are respectively connected to the baking branch pipes. The pressure gauge, the regulating valve and the check valve are installed on the baking branch pipes. The baking main pipe and the baking branches at both ends of the baking main pipe are provided with a plurality of evenly arranged combustion nozzles facing the wall of the swing groove.
[0007] The two baking supports are respectively fixed on the swing groove, and the baking main pipe is rotatably connected to the two baking supports.
[0008] The baking main pipe is a special-shaped pipe that is thick in the middle and thin at both ends, and the thick part in the middle is located between the two baking supports.
[0009] The outer contour of the thick part in the middle of the baking main pipe matches the shape of the swing groove.
[0010] A hanging lug is provided on the thick middle part of the baking main pipe.
[0011] The beneficial effects of the utility model are: it can quickly and conveniently realize the baking of the swing groove, reduce the use of coke oven gas, improve the baking effect, and increase the service life of the swing groove in front of the furnace from an average of 60,000 tons to 100,000-120,000 tons of iron flow. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is the main view of the utility model;
[0013] Figure 2 This is a top view of the utility model;
[0014] In the figure: 1-swing groove, 2-baking main pipe, 3-combustion nozzle, 4-baking support, 5-lifting ear, 6-pressure gauge, 7-regulating valve, 8-check valve, 9-gas source, 10-baking branch pipe. DETAILED DESCRIPTION
[0015] The present invention will be further described below with reference to the accompanying drawings and examples.
[0016] Refer to the attached Figure 1-2 A blast furnace swing groove baking device includes a swing groove 1, a baking main pipe 2, a combustion nozzle 3, a baking support 4, a pressure gauge 6, a regulating valve 7, a check valve 8, a gas source 9 and a baking branch pipe 10. The baking main pipe 2 is fixed to the swing groove 1 through two baking supports 4. The two ends of the baking main pipe 2 are respectively connected to the baking branch pipes 10. The baking branch pipes 10 are installed with a pressure gauge 6, a regulating valve 7 and a check valve 8. The baking main pipe 2 and the baking branches 10 at both ends of the baking main pipe 2 are provided with a plurality of evenly arranged combustion nozzles 3 facing the wall of the swing groove 1.
[0017] In this embodiment, the baking branch pipe 10 has a diameter of 30-50 mm, and the baking main pipe 2 is a special-shaped pipe with a thick middle part and thin ends. The thick middle part is located between the two baking supports 4, and the outer contour matches the shape of the swing groove 1, and is fixed with a lifting ear 5.
[0018] The aperture of the multiple evenly arranged combustion nozzles 3 on the baking main pipe 2 and the baking branch pipes 10 at both ends of the baking main pipe 2 and facing the groove wall of the swing groove 1 is 5mm-8mm, and the interval is 100mm.
[0019] Refer to the attached Figure 1-2, the swing groove baking method is as follows:
[0020] 1. Inspection before operation
[0021] 1) Check that the material in the swing groove has no cracks, collapses, or deformations, that the nozzle of the swing groove baking device is unobstructed and unblocked, that the regulating valve is tightly closed, and that the pressure gauge index is zero;
[0022] 2) Hold the lifting lug 5 and hang the baking device into the center of the swing groove, aligned with the center line of the long side of the swing groove. Connect one end of the baking device to the air source and keep the other end in reserve.
[0023] 3) Cover the swing groove roaster support 4 with a dust cover;
[0024] 2. Operation
[0025] 1) Open the regulating valve at the air inlet of the baking device and check whether there is pressure on the pressure gauge;
[0026] 2) After ignition, gradually open the baking regulating valves on both sides and bake on low heat for 1-3 days. At this time, the pressure on the pressure gauge increases;
[0027] 3) Increase the device adjustment valve and bake on medium heat for 1-3 days;
[0028] 4) Continue to increase the regulating valve of the device and bake it at high heat for 1-3 days to reach the standard of baking completion of the swing groove.
[0029] 5) After baking is completed, close the device regulating valve, that is, the flame of the baking device is extinguished, close all regulating valves, and check that the pressure gauge index drops to zero.
Claims
1. A blast furnace front swing groove baking device, characterized in that: The invention comprises a swing groove (1), a baking main pipe (2), a combustion nozzle (3), a baking support (4), a pressure gauge (6), a regulating valve (7), a check valve (8), an air source (9) and a baking branch pipe (10). The baking main pipe (2) is fixed to the swing groove (1) through two baking supports (4). Both ends of the baking main pipe (2) are connected to the baking branch pipes (10). The pressure gauge (6), the regulating valve (7) and the check valve (8) are installed on the baking branch pipes (10). The baking main pipe (2) and the baking branch pipes (10) at both ends of the baking main pipe (2) are provided with a plurality of evenly arranged combustion nozzles (3) facing the groove wall of the swing groove (1).
2. A blast furnace front swing groove baking device according to claim 1, characterized in that: The two baking supports (4) are respectively fixed on the swing groove (1), and the baking main pipe (2) is rotatably connected to the two baking supports (4).
3. A blast furnace front swing groove baking device according to claim 2, characterized in that: The baking main pipe (2) is a special-shaped pipe that is thick in the middle and thin at both ends, and the thick part in the middle is located between the two baking supports (4).
4. The blast furnace front swing groove baking device according to claim 3, characterized in that: The outer contour of the thick middle portion of the baking main pipe (2) matches the shape of the swing groove (1).
5. The blast furnace front swing groove baking device according to claim 4, characterized in that: A hanging lug (5) is provided on the thick middle portion of the baking main pipe (2).