Device for prolonging service life of pulverized coal pipeline
By installing wear-resistant steel pipes and wear-resistant coatings at the bends of coal pulverized pipes and setting up a coal pulverized scraping mechanism, the direction of movement of coal pulverized pipes is solved, the wear problem of coal pulverized pipes is extended, and the service life is reduced and the impact on blast furnace is reduced. .
Patent Information
- Application Number
- CN202421153947.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-24
AI Technical Summary
During the blast furnace iron smelting process, the coal pulverized pipeline is easily worn by the coal pulverized particles during the transportation process, especially in the bent parts, resulting in a shortening of service life.
Design a device, including the first and second coal pulverized steel pipes, installed at the bend of the coal pulverized pipe by welding, and a wear-resistant coating and a coal pulverized scraping mechanism are provided on the inner wall to change the direction of the coal pulverized motion to avoid Directly wash.
It effectively extends the service life of the pulverized coal pipeline, reduces the impact of pipeline leakage points on the blast furnace caused by coal shutdown treatment, and reduces wear and cleaning difficulty through wear-resistant coating and scraping mechanism.
Smart Images
Figure CN222455073U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ironmaking technology, in particular to a device for extending the service life of a coal powder pipeline. Background Art
[0002] Blast furnace ironmaking is a metallurgical process that reduces iron from iron ore. It is the main method of modern ironmaking. The main raw materials for blast furnace ironmaking include iron ore, coke and flux (such as limestone). These raw materials are loaded into the blast furnace from the top of the furnace according to the specified ratio. In the blast furnace, the carbon in the coke burns with the oxygen in the high-temperature air blown in, producing carbon monoxide and hydrogen. During the rising process, these gases remove the oxygen in the iron ore, thereby reducing the iron. The smelted liquid iron is released from the iron mouth at the top of the furnace and eventually solidifies into pig iron. The unreduced impurities in the iron ore combine with the flux to form slag, which is discharged from the bottom of the furnace. The generated coal gas is discharged from the top of the furnace and can be used as fuel for hot blast stoves, heating furnaces, coke ovens and boilers after dust removal. Blast furnace ironmaking has good technical and economic indicators, simple process, large production volume, high labor productivity and low energy consumption. Therefore, the iron produced by this method accounts for the vast majority of the world's total iron production.
[0003] Pulverized coal injection is an important technical means to reduce the cost of blast furnace ironmaking. Generally, the pulverized coal preparation workshop is more than 1,000 meters away from the blast furnace. The pulverized coal needs to be transported to the blast furnace distributor through a pipeline. Since pulverized coal is a granular material, it will cause wear to the pipeline during transportation, especially the bends of the pipeline, where the wear is more serious. Therefore, we propose a device to extend the service life of the pulverized coal pipeline. Utility Model Content
[0004] The utility model aims to provide a device for extending the service life of a pulverized coal pipeline, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for extending the service life of a pulverized coal pipeline, comprising a pulverized coal injection tank, a first pulverized coal redirecting steel pipe, a second pulverized coal redirecting steel pipe and a blast furnace, wherein the first pulverized coal redirecting steel pipe is arranged on one side of the pulverized coal injection tank, the second pulverized coal redirecting steel pipe is arranged on one side of the first pulverized coal redirecting steel pipe, the blast furnace is arranged on one side of the second pulverized coal redirecting steel pipe, a first lower steel plate is welded to the bottom end of the first pulverized coal redirecting steel pipe, and a first upper steel plate is welded to the top end of the first pulverized coal redirecting steel pipe, a first inlet hole is arranged on the outer wall of one side of the first pulverized coal redirecting steel pipe, and a first outlet hole is arranged on the outer wall of the other side of the first pulverized coal redirecting steel pipe, a second lower steel plate is welded to the bottom end of the second pulverized coal redirecting steel pipe, and a second upper steel plate is welded to the top end of the second pulverized coal redirecting steel pipe, A second inlet hole is provided on the outer wall of one side of the second coal powder changing steel pipe, and a second outlet hole is provided on the outer wall of the other side of the second coal powder changing steel pipe, a first coal powder conveying pipeline is provided between the coal powder injection tank and the first coal powder changing steel pipe, and one end of the first coal powder conveying pipeline is welded to the coal powder injection tank, and the other end of the coal powder injection tank is welded to the first inlet hole, a second coal powder conveying pipeline is provided between the first coal powder changing steel pipe and the second coal powder changing steel pipe, and one end of the second coal powder conveying pipeline is welded to the first outlet hole, and the other end of the second coal powder conveying pipeline is welded to the second inlet hole, a third coal powder conveying pipeline is provided between the second coal powder changing steel pipe and the blast furnace, and one end of the third coal powder conveying pipeline is welded to the second outlet hole, and the other end of the third coal powder conveying pipeline is welded to the blast furnace.
[0006] Preferably, the first coal powder changing direction steel pipe and the second coal powder changing direction steel pipe are both made of 16MnCr3.
[0007] Preferably, the first coal powder changing direction steel pipe and the second coal powder changing direction steel pipe are 120 mm long and DN 200 mm.
[0008] Preferably, the first inlet hole, the first outlet hole, the second inlet hole and the second outlet hole are respectively arranged in the circumferential direction of the first coal powder changing direction steel pipe and the second coal powder changing direction steel pipe to facilitate changing the movement direction of the coal powder.
[0009] Preferably, the inner surfaces of the first coal powder changing steel pipe and the second coal powder changing steel pipe are both provided with a first wear-resistant coating by chemical vapor deposition, and the first wear-resistant coating is a silicon carbide coating, which can further enhance the hardness, toughness and wear resistance of the first coal powder changing steel pipe and the second coal powder changing steel pipe.
[0010] Preferably, the first coal powder changing direction steel pipe and the second coal powder changing direction steel pipe are both provided with a coal powder scraping mechanism, and the coal powder scraping mechanism includes a rotating rod and a handle. The rotating rod is installed at the center position inside the first upper steel plate and the second upper steel plate through a bearing, and the handle is welded to the top of the rotating rod to facilitate the rotation of the arc-shaped scraper strip.
[0011] Preferably, the coal powder scraping mechanism also includes a cross bar and an arc-shaped scraping strip. The cross bar is welded to the bottom end of the rotating rod, and the arc-shaped scraping strips are welded to both sides of the bottom end of the cross bar. The arc-shaped scraping strips are tightly fitted to the inner walls of the first coal powder changing steel pipe and the second coal powder changing steel pipe, so as to facilitate scraping off the coal powder attached to the inner walls of the first coal powder changing steel pipe and the second coal powder changing steel pipe.
[0012] Preferably, the surface of the first wear-resistant coating is sprayed with a second wear-resistant coating, and the second wear-resistant coating is a molybdenum disulfide coating, which can reduce the friction coefficient of the first coal powder changing steel pipe and the second coal powder changing steel pipe and reduce wear.
[0013] Compared with the prior art, the utility model has the following beneficial effects: the device for extending the service life of the pulverized coal pipeline can not only avoid the direct scouring of the pipeline by pulverized coal particles, extend the service life of the pipeline, eliminate the influence on the blast furnace caused by the pipeline leakage point caused by coal stoppage treatment, and has a long service life, but also facilitates the scraping of pulverized coal particles attached to the inside of the device;
[0014] (1) A first coal powder redirecting steel pipe, a first lower steel plate, a first upper steel plate, a first inlet hole, a first outlet hole, a second coal powder redirecting steel pipe, a second lower steel plate, a second upper steel plate, a second inlet hole, and a second outlet hole are provided. The first coal powder redirecting steel pipe and the second coal powder redirecting steel pipe are welded and installed at the bend of the coal powder pipeline. The coal powder injection tank, the first coal powder redirecting steel pipe, the second coal powder redirecting steel pipe, and the blast furnace are connected through the first coal powder conveying pipeline, the second coal powder conveying pipeline, and the third coal powder conveying pipeline. After the coal powder enters the first coal powder redirecting steel pipe and the second coal powder redirecting steel pipe, due to the sudden change in movement direction, it will accumulate on the inner wall of the first coal powder redirecting steel pipe and the second coal powder redirecting steel pipe. The subsequent coal powder will impact the coal powder accumulated in the previous stage, avoiding direct scouring of the pipeline, thereby extending the service life of the pipeline. The method can avoid direct scouring of the pipeline by coal powder particles, extend the service life of the pipeline, and eliminate the impact on the blast furnace due to the suspension of coal treatment of pipeline leakage points;
[0015] (2) By providing the first wear-resistant coating and the second wear-resistant coating, since the first wear-resistant coating is deposited on the inner wall of the first coal powder turning steel pipe and the second coal powder turning steel pipe by chemical vapor deposition, and the first wear-resistant coating is a silicon carbide coating, the hardness, toughness and wear resistance of the first coal powder turning steel pipe and the second coal powder turning steel pipe can be further enhanced, and the second wear-resistant coating sprayed on the surface of the first wear-resistant coating can reduce the friction coefficient and reduce wear, thereby extending the service life of the device;
[0016] (3) A rotating rod, a handle, a cross bar, and an arc-shaped scraper are provided. The rotating rod is rotated by the handle, and the rotating rod drives the cross bar to rotate. The cross bar drives the arc-shaped scraper to rotate. The arc-shaped scraper scrapes off the coal powder particles attached to the inner walls of the first coal powder changing direction steel pipe and the second coal powder changing direction steel pipe, thereby facilitating the scraping of the coal powder particles attached to the inside of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the main structure of the utility model;
[0018] Figure 2 It is a partial enlarged structural schematic diagram of the utility model;
[0019] Figure 3 It is a schematic diagram of a partially enlarged top view of the cross section of the utility model;
[0020] Figure 4 This is a schematic diagram of the enlarged cross-sectional structure of the first coal powder changing direction steel pipe of the utility model;
[0021] Figure 5 It is a schematic diagram of a partial cross-section and enlarged structure of the side wall of the first coal powder redirection steel pipe of the utility model.
[0022] In the figure: 1. pulverized coal injection tank; 2. first pulverized coal redirecting steel pipe; 201. first lower steel plate; 202. first upper steel plate; 203. first inlet hole; 204. first outlet hole; 3. second pulverized coal redirecting steel pipe; 301. second lower steel plate; 302. second upper steel plate; 303. second inlet hole; 304. second outlet hole; 4. blast furnace; 5. first pulverized coal conveying pipeline; 6. second pulverized coal conveying pipeline; 7. third pulverized coal conveying pipeline; 8. pulverized coal scraping mechanism; 801. rotating rod; 802. handle; 803. cross bar; 804. arc scraping strip; 9. first wear-resistant coating; 10. second wear-resistant coating. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the utility model shall fall within the scope of protection of the utility model.
[0024] See also Figure 1-5The utility model provides an embodiment: a device for extending the service life of a pulverized coal pipeline, comprising a pulverized coal injection tank 1, a first pulverized coal redirecting steel pipe 2, a second pulverized coal redirecting steel pipe 3 and a blast furnace 4, wherein the first pulverized coal redirecting steel pipe 2 is arranged on one side of the pulverized coal injection tank 1, the second pulverized coal redirecting steel pipe 3 is arranged on one side of the first pulverized coal redirecting steel pipe 2, the blast furnace 4 is arranged on one side of the second pulverized coal redirecting steel pipe 3, the bottom end of the first pulverized coal redirecting steel pipe 2 is welded with a first lower steel plate 201, and the top end of the first pulverized coal redirecting steel pipe 2 is welded with a first lower steel plate 201. A first upper steel plate 202 is connected, a first inlet hole 203 is provided on the outer wall of one side of the first coal powder changing steel pipe 2, and a first outlet hole 204 is provided on the outer wall of the other side of the first coal powder changing steel pipe 2, a second lower steel plate 301 is welded to the bottom end of the second coal powder changing steel pipe 3, and a second upper steel plate 302 is welded to the top end of the second coal powder changing steel pipe 3, a second inlet hole 303 is provided on the outer wall of one side of the second coal powder changing steel pipe 3, and a second outlet hole 304 is provided on the outer wall of the other side of the second coal powder changing steel pipe 3;
[0025] A first pulverized coal conveying pipeline 5 is provided between the pulverized coal injection tank 1 and the first pulverized coal redirecting steel pipe 2, and one end of the first pulverized coal conveying pipeline 5 is welded to the pulverized coal injection tank 1, and the other end of the pulverized coal injection tank 1 is welded to the first inlet hole 203, a second pulverized coal conveying pipeline 6 is provided between the first pulverized coal redirecting steel pipe 2 and the second pulverized coal redirecting steel pipe 3, and one end of the second pulverized coal conveying pipeline 6 is welded to the first outlet hole 204, and the other end of the second pulverized coal conveying pipeline 6 is welded to the second inlet hole 303, a third pulverized coal conveying pipeline 7 is provided between the second pulverized coal redirecting steel pipe 3 and the blast furnace 4, and one end of the third pulverized coal conveying pipeline 7 is welded to the second outlet hole 304, and the other end of the third pulverized coal conveying pipeline 7 is welded to the blast furnace 4;
[0026] The first coal powder changing direction steel pipe 2 and the second coal powder changing direction steel pipe 3 are both made of 16MnCr3;
[0027] The first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3 are 120mm long and DN200mm;
[0028] The first inlet hole 203, the first outlet hole 204, the second inlet hole 303, and the second outlet hole 304 are respectively arranged in the circumferential direction of the first coal powder changing direction steel pipe 2 and the second coal powder changing direction steel pipe 3, so as to change the movement direction of the coal powder;
[0029] The first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3 are both provided with a first wear-resistant coating 9 by chemical vapor deposition on their inner surfaces, and the first wear-resistant coating 9 is a silicon carbide coating, which can further enhance the hardness, toughness and wear resistance of the first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3;
[0030] The first coal powder redirecting steel pipe 2 and the second coal powder redirecting steel pipe 3 are both provided with a coal powder scraping mechanism 8, the coal powder scraping mechanism 8 comprises a rotating rod 801 and a handle 802, the rotating rod 801 is installed at the center position inside the first upper steel plate 202 and the second upper steel plate 302 through a bearing, and the handle 802 is welded to the top of the rotating rod 801 to facilitate the rotation of the arc scraping strip 804;
[0031] The coal powder scraping mechanism 8 also includes a cross bar 803 and an arc scraping strip 804. The cross bar 803 is welded to the bottom end of the rotating rod 801. The arc scraping strips 804 are welded to both sides of the bottom end of the cross bar 803. The arc scraping strips 804 are tightly fitted to the inner walls of the first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3, so as to facilitate scraping off the coal powder attached to the inner walls of the first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3.
[0032] The surface of the first wear-resistant coating 9 is sprayed with a second wear-resistant coating 10, and the second wear-resistant coating 10 is a molybdenum disulfide coating, which can reduce the friction coefficient of the first coal powder turning steel pipe 2 and the second coal powder turning steel pipe 3 and reduce wear.
[0033] When the embodiment of the present application is used: first, the device is mainly composed of a first coal powder changing steel pipe 2 and a second coal powder changing steel pipe 3. The first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3 are welded and installed at the bend of the coal powder pipeline. The first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3 are wear-resistant steel pipes with a length of 120 mm and a DN of 200 mm. The material is 16MnCr3. The first lower steel plate 201, the first upper steel plate 202, the second lower steel plate 301, and the second upper steel plate 302 are welded at the lower and upper ports of the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3. In the circumferential direction of the pipe 3, the first inlet hole 203, the first outlet hole 204, the second inlet hole 303, and the second outlet hole 304 are respectively opened according to the angle of the coal powder conveying pipeline. Then, one end of the first coal powder conveying pipeline 5 is welded to the coal powder injection tank 1, and the other end is welded to the first inlet hole 203. One end of the second coal powder conveying pipeline 6 is welded to the first outlet hole 204, and the other end is welded to the second inlet hole 303. One end of the third coal powder conveying pipeline 7 is welded to the second outlet hole 304, and the other end is welded to the blast furnace 4. The inlet and outlet pipes are welded respectively, so that the coal powder injection tank 1, the first coal powder turning steel pipe 2, the second coal powder turning steel pipe 3, and the blast furnace 4 are welded through the first coal powder conveying The pipeline 5, the second coal powder conveying pipeline 6, and the third coal powder conveying pipeline 7 are connected. After the coal powder enters the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3, the coal powder will gather on the inner wall of the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3 due to the sudden change in the direction of movement. The subsequent coal powder will impact the coal powder gathered in the early stage to avoid direct scouring of the pipeline, thereby extending the service life of the pipeline. The method can avoid the direct scouring of the pipeline by coal powder particles, extend the service life of the pipeline, and eliminate the impact on the blast furnace caused by stopping coal to deal with pipeline leakage. Since the inner walls of the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3 are coated with the third coal powder conveying pipeline 7 by chemical vapor deposition, the second coal powder conveying pipeline 7 can be used to prevent the coal powder from being directly eroded by coal powder particles. A wear-resistant coating 9, wherein the first wear-resistant coating 9 is a silicon carbide coating, can further enhance the hardness, toughness and wear resistance of the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3, and the second wear-resistant coating 10 sprayed on the surface of the first wear-resistant coating 9 can reduce the friction coefficient and reduce wear, thereby extending the service life of the device, and by rotating the rotating rod 801 through the handle 802, the rotating rod 801 drives the cross bar 803 to rotate, and the cross bar 803 drives the arc scraper bar 804 to rotate, and the arc scraper bar 804 scrapes off the coal powder particles attached to the inner walls of the first coal powder changing steel pipe 2 and the second coal powder changing steel pipe 3, thereby facilitating the scraping of the coal powder particles attached to the inside of the device.
Claims
1. A device for extending the service life of a pulverized coal pipeline, characterized in that: The invention comprises a pulverized coal injection tank (1), a first pulverized coal redirecting steel pipe (2), a second pulverized coal redirecting steel pipe (3) and a blast furnace (4), wherein the first pulverized coal redirecting steel pipe (2) is arranged on one side of the pulverized coal injection tank (1), the second pulverized coal redirecting steel pipe (3) is arranged on one side of the first pulverized coal redirecting steel pipe (2), the blast furnace (4) is arranged on one side of the second pulverized coal redirecting steel pipe (3), a first lower steel plate (201) is welded to the bottom end of the first pulverized coal redirecting steel pipe (2), and the first pulverized coal redirecting steel pipe (2) is welded to the bottom end of the first pulverized coal redirecting steel pipe (2). A first upper steel plate (202) is welded to the top of the first coal powder redirecting steel pipe (2), a first inlet hole (203) is provided on the outer wall of one side of the first coal powder redirecting steel pipe (2), and a first outlet hole (204) is provided on the outer wall of the other side of the first coal powder redirecting steel pipe (2), a second lower steel plate (301) is welded to the bottom end of the second coal powder redirecting steel pipe (3), and a second upper steel plate (302) is welded to the top of the second coal powder redirecting steel pipe (3), and a second inlet hole (203) is provided on the outer wall of one side of the second coal powder redirecting steel pipe (3). A hole (303) is formed on the outer wall of the second coal powder redirecting steel pipe (3), and a second outlet hole (304) is provided on the outer wall of the other side of the second coal powder redirecting steel pipe (3). A first coal powder conveying pipeline (5) is provided between the coal powder injection tank (1) and the first coal powder redirecting steel pipe (2), and one end of the first coal powder conveying pipeline (5) is welded to the coal powder injection tank (1), and the other end of the coal powder injection tank (1) is welded to the first inlet hole (203). A first coal powder redirecting steel pipe (2) and a second coal powder redirecting steel pipe (3) are provided between the first coal powder redirecting steel pipe (2) and the second coal powder redirecting steel pipe (3). A second pulverized coal conveying pipeline (6), one end of which is welded to the first outlet hole (204), and the other end of which is welded to the second inlet hole (303); a third pulverized coal conveying pipeline (7) is provided between the second pulverized coal redirecting steel pipe (3) and the blast furnace (4), one end of which is welded to the second outlet hole (304), and the other end of which is welded to the blast furnace (4).
2. The device for extending the service life of a pulverized coal pipeline according to claim 1, characterized in that: The first coal powder changing direction steel pipe (2) and the second coal powder changing direction steel pipe (3) are both made of 16MnCr3.
3. The device for extending the service life of a pulverized coal pipeline according to claim 1, characterized in that: The first coal powder changing direction steel pipe (2) and the second coal powder changing direction steel pipe (3) are 120 mm long and DN 200 mm.
4. The device for extending the service life of a pulverized coal pipeline according to claim 1, characterized in that: The first inlet hole (203), the first outlet hole (204), the second inlet hole (303), and the second outlet hole (304) are respectively arranged in the circumferential direction of the first coal powder changing direction steel pipe (2) and the second coal powder changing direction steel pipe (3).
5. The device for extending the service life of a pulverized coal pipeline according to claim 1, characterized in that: A first wear-resistant coating (9) is formed on the inner surfaces of the first coal powder changing direction steel pipe (2) and the second coal powder changing direction steel pipe (3) by chemical vapor deposition, and the first wear-resistant coating (9) is a silicon carbide coating.
6. The device for extending the service life of a pulverized coal pipeline according to claim 1, characterized in that: A coal powder scraping mechanism (8) is provided inside the first coal powder redirecting steel pipe (2) and the second coal powder redirecting steel pipe (3). The coal powder scraping mechanism (8) comprises a rotating rod (801) and a handle (802). The rotating rod (801) is installed at the center position inside the first upper steel plate (202) and the second upper steel plate (302) through a bearing, and the handle (802) is welded to the top end of the rotating rod (801).
7. The device for extending the service life of a pulverized coal pipeline according to claim 6, characterized in that: The coal powder scraping mechanism (8) further comprises a cross bar (803) and an arc-shaped scraping strip (804), wherein the cross bar (803) is welded to the bottom end of the rotating rod (801), and the arc-shaped scraping strip (804) is welded to both sides of the bottom end of the cross bar (803), and the arc-shaped scraping strip (804) is tightly fitted to the inner walls of the first coal powder redirecting steel pipe (2) and the second coal powder redirecting steel pipe (3).
8. The device for extending the service life of a pulverized coal pipeline according to claim 5, characterized in that: A second wear-resistant coating (10) is sprayed on the surface of the first wear-resistant coating (9), and the second wear-resistant coating (10) is a molybdenum disulfide coating.