Device for solving high-temperature collapse of three-way opening of hot air pipeline
By adopting a combination of T-shaped structure and multi-layer refractory bricks at the three forks of the hot air furnace, combined with refractory fiber cotton and spray coating layer, the vertical and horizontal two-way interlocking structure is formed, the problems of uneven temperature and uneven expansion at the three forks are solved, the service life is extended, the wind temperature and output are improved, and the energy saving and production are achieved is achieved.
Patent Information
- Application Number
- CN202421816948.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-30
AI Technical Summary
Due to uneven internal and external temperatures, uneven vertical and horizontal expansion and concentrated stress at the three forks of the hot air furnace, the brick body collapses and the tube shells turn red, shortens the service life, affecting the high wind temperature transportation and the reduction of iron smelting costs.
The T-shaped three-fork structure is adopted, and the inner ring is built with heavy refractory bricks, the middle ring is light bricks, and the outer ring is light bricks. The semi-ring refractory fiber cotton and spray coating layer are installed on the outside to form a vertical and horizontal bidirectional interlocking structure, and the expansion joint is filled with refractory fiber cotton.
It effectively solves the problems of uneven temperature, uneven expansion and stress concentration at the three forks, extends the service life, increases wind temperature and output, saves energy and increases production, and reduces the rest rate of the ironworks.
Smart Images
Figure CN222846751U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of hot blast furnaces, in particular to a device for solving the high-temperature collapse of a hot blast pipeline three-way junction. Background Art
[0002] The hot blast outlet and the hot blast pipe junction of the hot blast furnace are subjected to high temperatures above 1200℃ and high pressures of 0.3-0.5MPa, and they frequently move under stress during the combustion and air supply working cycle of the hot blast furnace. The working environment is extremely harsh. The hot blast outlet and the hot blast branch pipe junction are prone to high temperatures, brick lining collapse, red tube shells, and even explosion accidents. This will greatly shorten the service life of the pipeline, which will limit the transportation of high blast temperatures and become a stumbling block to increasing production, saving coke, and reducing ironmaking costs. It is the key control part of the hot blast furnace and also the control difficulty.
[0003] Generally, hot air furnaces and hot air duct junctions are built in the form of composite bricks or semi-combined and semi-casting during design and construction. 1. The junction is built in the form of composite bricks: Due to the effect of the longitudinal and transverse bidirectional expansion force of the hot air duct junction during operation, and the traditional intersecting line structure of the junction, in the long-term operation process, the composite bricks of the junction are prone to fall off under the bidirectional force, and the composite bricks on the upper part of the pipeline sag, resulting in too large gaps between the composite bricks, forming a high-temperature channel, and making the outer shell of the pipeline red, forcing the use of grouting for maintenance. In severe cases, it is necessary to rest for a long time and wait for the pipeline to cool down before re-building with composite bricks.
[0004] 2. Use castables for pouring: castables are generally used in the upper half of the hot air duct with a relatively poor stress structure, and the lower half is also built in the form of combined bricks. This will solve the stress concentration problem caused by the intersection line. However, if the thickness of the castable is too thin during the pouring process, the inside and outside will be heated evenly during the oven baking process, and the expansion is balanced, but the supporting strength is insufficient. Under the impact of high temperature and high wind pressure, it is easy to collapse. If the castable is too thick, the inside and outside temperatures will be different during the oven baking process, resulting in uneven expansion inside and outside, which is easy to cause the castable to break and form cracks, reducing the overall service life. The general service life is within 3 years.
[0005] Blast furnaces are generally baked directly with hot blast furnaces. After the hot blast furnace is finished baking, the hot air is directly transported to the blast furnace from the hot blast duct. Generally, baking the blast furnace is a process of slowly rising temperature, while the temperature of the hot blast furnace is constant, which requires a large amount of cold air to be mixed in the early stage. As the amount of cold air decreases, the temperature of the hot air transported to the blast furnace rises. This is a process. Generally, the mixed air duct is after the hot blast duct fork, which causes the fork after masonry or pouring to directly contact the high air temperature of more than 1000℃ transported from the hot blast furnace without a slow heating process. This will cause the temperature of the brick body to be uneven from the inside to the outside, the longitudinal and transverse expansion to be uneven, and the stress to be concentrated at the fork. Therefore, the hot blast furnace fork will generally have high temperature within 2 years of use, and will collapse in severe cases, and the tube shell will turn red. In this way, the service life of the pipeline will be greatly shortened, which has become a major obstacle to reducing ironmaking costs such as increasing air temperature, increasing production, and saving coke. Therefore, improving the refractory brick structure of the hot air duct three-way junction to meet the requirements of high pressure and high air temperature is a technical issue related to longevity, energy saving, increased production and reduced consumption. Summary of the invention
[0006] In view of the above situation, in order to solve the defects of the prior art, the purpose of the utility model is to provide a hot blast furnace three-way junction device, which can effectively solve the problems of uneven temperature from the inside to the outside, uneven longitudinal and lateral expansion, and stress concentration at the three-way junction, which leads to collapse of the three-way junction, reddening of the tube shell, and reduced service life.
[0007] The technical solution solved by the utility model is that it comprises a T-shaped three-way intersection, the inner ring of the three-way intersection is built with heavy refractory bricks, the outer side of the heavy refractory bricks is built with a middle ring of lightweight bricks, the outer side of the middle ring of lightweight bricks is built with an outer ring of lightweight bricks, a half ring of refractory fiber cotton is arranged on the outer side of the outer ring of lightweight bricks, and a whole ring of spray coating layer is applied on the outer side of the refractory fiber cotton.
[0008] The utility model has novel structure, reasonable design and good use effect, which reduces the wind stop rate of the blast furnace in the iron-making plant, improves the wind temperature and output, and at the same time makes certain contributions to the energy saving, production increase and consumption reduction of the iron-making plant, and is an innovation in the three-way structure of the hot blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram of the utility model.
[0010] Figure 2 This is the internal refractory material structure distribution diagram of the utility model.
[0011] Figure 3 It is a schematic diagram of the structural cross section of the utility model (only the inner ring is shown).
[0012] Figure 4 For this utility model Figure 3Schematic diagram of the AA cross-section structure.
[0013] Figure 5 For this utility model Figure 3 Schematic diagram of the BB cross-section structure.
[0014] Figure 6 This is a schematic diagram of the vertical and horizontal bidirectional integrated brick structure of the utility model.
[0015] Figure 7 This is a schematic diagram of the first interlocking brick structure of the utility model.
[0016] Figure 8 This is a schematic diagram of the second interlocking brick structure of the utility model.
[0017] Fig. 9 This is a schematic diagram of the third interlocking brick structure of the present utility model.
[0018] Fig.10 This is a schematic diagram of the fourth interlocking brick structure of the present utility model. DETAILED DESCRIPTION
[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.
[0020] Depend on Figure 1-10 The utility model comprises a T-shaped three-way intersection structure 1, the inner ring of the three-way intersection structure 1 is built with heavy refractory bricks 4, the outer side of the heavy refractory bricks 4 is built with a middle ring of lightweight bricks 5, the outer side of the middle ring of lightweight bricks 5 is built with an outer ring of lightweight bricks 6, the outer side of the outer ring of lightweight bricks 6 is provided with a half ring of refractory fiber cotton 7, and the outer side of the refractory fiber cotton 7 is coated with a full ring of spray coating layer 8.
[0021] In order to ensure the use effect, the three-way structure 1 is sealed and connected to the original pipe shell 2 through the flange 3. This connection form is convenient for maintenance and replacement during the long-term use of the hot air pipe.
[0022] The upper part of the hot air duct inner ring heavy refractory brick structure 4 is composed of a longitudinal and transverse bidirectional integrated brick 9, a first interlocking brick 10, a second interlocking brick 11, a third interlocking brick 12 and a fourth interlocking brick 13. The longitudinal and transverse bidirectional integrated brick 9 forms a Z-shaped structure 14 with the first interlocking brick 10 and the second interlocking brick 11 in the longitudinal direction to interlock them into a whole, and the transverse direction of the longitudinal and transverse bidirectional integrated brick 9 forms a Z-shaped structure 14 with the third interlocking brick 12 and the fourth interlocking brick 13 in the transverse direction to interlock them into a whole.
[0023] The vertical and horizontal bidirectional integrated brick 9 is composed of two arc-shaped bodies, one large and one small, with inclined end faces in the vertical and horizontal directions, which are centered and staggered in the longitudinal and transverse directions as an integral structure. The arc-shaped body of the lower layer is proportionally smaller than the arc-shaped body of the upper layer. The protrusions and grooves on the two longitudinal end faces formed by the staggered connection respectively match the grooves and protrusions of the first interlocking brick 10 and the second interlocking brick 11; the protrusions and grooves on the two transverse end faces formed by the staggered connection respectively match the grooves and protrusions of the third interlocking brick 12 and the fourth interlocking brick 13.
[0024] The first interlocking brick 10 and the second interlocking brick 11 are both composed of two wedge-shaped bodies of the same size with inclined end faces in the vertical and horizontal directions, which are staggered front to back in the longitudinal direction and staggered left to right in the horizontal direction, and connected as a whole. The inclined sides of the wedge-shaped bodies are concave arcs, and the protrusions and grooves formed by the staggered positions match the grooves and protrusions of the vertical and horizontal bidirectional integrated bricks 9 respectively.
[0025] The third interlocking brick 12 is composed of two arc-shaped bodies of the same size with inclined end faces in the longitudinal and transverse directions, which are staggered longitudinally front to back and horizontally left to right and connected as a whole. The protrusions and grooves formed by the staggered connection match the grooves and protrusions of the longitudinal and transverse bidirectional integrated brick 9 respectively.
[0026] The fourth interlocking brick 13 is composed of two arc-shaped bodies with four inclined end faces, one wide and one narrow, of equal length, which are longitudinally centrally offset and laterally offset to the left and right to be connected as one body. The width of the arc-shaped body of the lower layer is smaller than that of the arc-shaped body of the upper layer. The protrusions and grooves formed by the offset match the grooves and protrusions of the longitudinal and transverse bidirectional integrated brick 9 respectively.
[0027] The hot air duct inner ring heavy brick structure 4 is provided with a first Z-shaped expansion joint 15 in the longitudinal direction, the first Z-shaped expansion joint 15 is filled with refractory fiber cotton and is Z-shapedly butt-jointed with the existing traditional hot air duct bricks, and a second Z-shaped expansion joint 16 is provided in the transverse direction, the second Z-shaped expansion joint 16 is filled with refractory fiber cotton and is Z-shapedly butt-jointed with the existing traditional hot air duct bricks.
[0028] In the description of the present invention, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. If the terms "upper", "lower", "inner", "outer", "front", "back", "right", "lateral", "longitudinal", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.
[0029] The use of the utility model is that the three-way junction 1 is a T-shaped structure, which is to pick out the complex structural part of the hot air duct three-way junction separately, and the flange 3 is used to seal the three-way junction equipment 1 with the original pipe shell 2. The flange 3 connection form is to facilitate the maintenance and replacement of the hot air duct during long-term use, and is easy to operate. The interior is refractory masonry, and the heavy refractory bricks 4 in the inner ring of the three-way junction adopt a combined brick structure that eliminates the stress of the intersection line. All brick types of the combined bricks are machine-pressed. The refractory bricks that are subjected to stress in both the longitudinal and transverse directions are optimized from the original two bricks to a combined brick form that can solve the bidirectional stress effect - the longitudinal and transverse bidirectional integrated brick 9. In the longitudinal direction: the longitudinal and transverse bidirectional integrated brick 9 and the first interlocking brick 10 and the second interlocking brick 11 form a Z-shaped structure 14 in the longitudinal direction to interlock them into a whole; in the transverse direction: the longitudinal and transverse bidirectional integrated brick 9 and The third interlocking brick 12 and the fourth interlocking brick 13 form a Z-shaped structure 14 in the transverse direction to interlock them into a whole; in this way, the vertical and horizontal bidirectional integrated brick 9 and the first interlocking brick 10, the second interlocking brick 11, the third interlocking brick 12, and the fourth interlocking brick 13 simultaneously form a Z-shaped interlocking structure on the four surfaces in the vertical and horizontal directions. In such a combined brick structure, each refractory brick in the combined brick is simultaneously interlocked with the refractory bricks on the four surfaces in two directions close to it. This structure makes the entire three-way intersection structure form a whole, and according to the expansion coefficient of the material, a first Z-shaped expansion joint 15 is provided in the longitudinal direction of the inner ring heavy brick structure 4 of the hot air duct, and is filled with refractory fiber cotton to be connected with the existing traditional hot air duct bricks in a Z-shaped manner; a second Z-shaped expansion joint 16 is provided in the transverse direction of the inner ring heavy brick structure 4, and is filled with refractory fiber cotton to be connected with the existing traditional hot air duct bricks in a Z-shaped manner.
[0030] The utility model of the three-way combined brick form not only solves the problem of brick falling at the intersection line that cannot be avoided when using refractory bricks in the hot air duct, but also solves the problem of high temperature of the furnace shell caused by cracking of the spray material due to uneven heating of the inside and outside expansion when using castables. The improved three-way stable structure reduces the wind-off rate of the blast furnace of the ironmaking plant, improves the wind temperature and output, and at the same time makes certain contributions to energy saving, production increase and consumption reduction of the ironmaking plant. It is an innovation in the three-way structure of the hot blast furnace and has good economic and social benefits.
[0031] It should be pointed out that the above is only a preferred embodiment of the utility model, and does not impose any form of limitation on the utility model. Any technician familiar with the profession can use the technical content disclosed above to make changes or modify it into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model, which all fall within the protection scope of the utility model.
Claims
1. A device for solving the high-temperature collapse of a hot air duct fork, comprising a T-shaped fork, characterized in that: The inner ring of the three-way intersection (1) is built with heavy refractory bricks (4), the outer side of the heavy refractory bricks (4) is built with a middle ring of lightweight bricks (5), the outer side of the middle ring of lightweight bricks (5) is built with an outer ring of lightweight bricks (6), the outer side of the outer ring of lightweight bricks (6) is provided with a half ring of refractory fiber cotton (7), and the outer side of the refractory fiber cotton (7) is coated with a full ring of spray coating material layer (8).
2. The device for solving the high temperature collapse of the hot air duct three-way junction according to claim 1 is characterized in that: The three-way junction (1) is sealed and connected to the original pipeline shell (2) via a flange (3).
3. The device for solving high temperature collapse of hot air duct three-way junction according to claim 1 is characterized in that: The heavy refractory brick (4) is composed of a vertical and horizontal bidirectional integrated brick (9), a first interlocking brick (10), a second interlocking brick (11), a third interlocking brick (12) and a fourth interlocking brick (13). The vertical and horizontal bidirectional integrated brick (9) forms a Z-shaped structure (14) with the first interlocking brick (10) and the second interlocking brick (11) in the longitudinal direction to interlock them into a whole; the vertical and horizontal bidirectional integrated brick (9) forms a Z-shaped structure (14) with the third interlocking brick (12) and the fourth interlocking brick (13) in the transverse direction to interlock them into a whole.
4. The device for solving high temperature collapse of hot air duct three-way junction according to claim 3 is characterized in that: The vertical and horizontal bidirectional integrated brick (9) is composed of two arc-shaped bodies, one large and one small, with inclined end faces in the vertical and horizontal directions, which are staggered and connected to form an integral body in the longitudinal and horizontal directions. The arc-shaped body of the lower layer is proportionally smaller than the arc-shaped body of the upper layer. The protrusions and grooves on the two longitudinal end faces formed by the staggered connection respectively match the grooves and protrusions of the first interlocking brick (10) and the second interlocking brick (11); the protrusions and grooves on the two transverse end faces formed by the staggered connection respectively match the grooves and protrusions of the third interlocking brick (12) and the fourth interlocking brick (13).
5. The device for solving high temperature collapse of hot air duct three-way junction according to claim 3 is characterized in that: The first interlocking brick (10) and the second interlocking brick (11) are both composed of two wedge-shaped bodies of the same size with inclined surfaces at the four longitudinal and transverse end faces, which are staggered longitudinally front to back and transversely left to right and connected as one body. The inclined sides of the wedge-shaped bodies are in the shape of an inwardly concave arc, and the protrusions and grooves formed by the staggering match the grooves and protrusions of the longitudinal and transverse bidirectional integrated brick (9) respectively.
6. The device for solving high temperature collapse of hot air duct three-way junction according to claim 3 is characterized in that: The third interlocking brick (12) is composed of two arc-shaped bodies of the same size with inclined end faces in the longitudinal and transverse directions, which are staggered longitudinally front to back and horizontally left to right and connected as one body. The protrusions and grooves formed by the staggered connection respectively match the grooves and protrusions of the longitudinal and transverse bidirectional integrated brick (9).
7. The device for solving high temperature collapse of hot air duct three-way junction according to claim 3 is characterized in that: The fourth interlocking brick (13) is composed of two arc-shaped bodies with four inclined end faces, one wide and one narrow, of equal length, which are longitudinally centrally offset and laterally offset to the left and right to be connected as a whole. The width of the arc-shaped body in the lower layer is smaller than that of the arc-shaped body in the upper layer. The protrusions and grooves formed by the offset match the grooves and protrusions of the longitudinal and transverse bidirectional integrated brick (9) respectively.
8. The device for solving high temperature collapse of hot air duct three-way junction according to claim 3 is characterized in that: The heavy refractory brick (4) is provided with a first Z-shaped expansion joint (15) in the longitudinal direction, and the first Z-shaped expansion joint (15) is filled with refractory fiber cotton; and a second Z-shaped expansion joint (16) is provided in the transverse direction, and the second Z-shaped expansion joint (16) is filled with refractory fiber cotton.