CN209783294U - prefabricated block for reinforcing radiation heat transfer of steel rolling heating furnace - Google Patents
prefabricated block for reinforcing radiation heat transfer of steel rolling heating furnace Download PDFInfo
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- CN209783294U CN209783294U CN201920391612.6U CN201920391612U CN209783294U CN 209783294 U CN209783294 U CN 209783294U CN 201920391612 U CN201920391612 U CN 201920391612U CN 209783294 U CN209783294 U CN 209783294U
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Abstract
The utility model relates to a reinforce prefabricated section of steel rolling heating furnace radiation heat transfer, including the base block, a side of base block is concave-convex structure, and it has one deck high radiation material layer to cover on the surface of concave-convex face. The concave-convex structure comprises a plurality of pits, and the joints of the pits and the surface of the base block are all arc chamfers. The utility model discloses the prefabricated block structure is unique, realizes the institutional advancement of furnace inner wall, directly pours the operation as the furnace inner wall with the prefabricated block at the furnace building in-process, increases the radiant heat transfer area and the emissivity of furnace inner wall, compares radiant heat transfer capacity with traditional furnace inner wall and increases more than 20%, and increase of production has reduced fuel consumption. Meanwhile, the supporting of the template on the inner side of the hearth can be omitted in the furnace building process, and the template and the furnace wall are cast into a whole in the furnace building process, so that the structure is stable. The furnace building process integrates the advantages of a prefabricated structure and integral casting, and has good integrity, air tightness and stability; the site operation is convenient and fast, and the service life is long.
Description
Technical Field
The utility model relates to a reinforce prefabricated section of steel rolling heating furnace radiation heat transfer belongs to steel rolling heating furnace and makes technical field.
Background
in the cost composition of metallurgical products in China, a steel rolling procedure accounts for 10% of the energy consumption of the whole metallurgical industry, and a heating furnace, as an important device of the steel rolling procedure, accounts for 75-80% of the energy consumption of the steel rolling procedure. The heating temperature in the hearth of the steel rolling heating furnace is 800-1300 ℃, and the heat transfer mode mainly takes radiation heat transfer, which accounts for more than 80% of the total heat transfer quantity. Practice proves that the heat efficiency of the heating furnace can be effectively improved and energy conservation is realized by enhancing radiation heat transfer. There are generally two methods of enhancing radiative heat transfer: the heating furnace hearth is internally provided with protrusions and bulges to increase the heat transfer area of the hearth; or the high-radiation coating material is sprayed on the inner wall of the hearth, so that the surface emissivity of the inner wall is improved.
in the traditional process, a method of pouring a furnace body and installing a heat radiating body in a built or operated hearth again is adopted to increase the radiation heat transfer area, and the radiating body is connected with the inner wall of the hearth into a whole by rivet riveting or high-temperature bonding and other modes. However, under the influence of thermal expansion and contraction of the furnace body, high-temperature flue gas scouring in the hearth and the like, the heat radiating body is easy to fall off from the furnace wall, and the inner wall of the hearth is damaged after falling off.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a precast block for strengthening the radiation heat transfer of a steel rolling heating furnace, wherein the surface of the precast block facing the interior of a furnace chamber is in a concavo-convex shape, so that the heat transfer area of the furnace chamber can be increased; meanwhile, when the precast block is manufactured, high emissivity materials can be added on the concave-convex surface or a high radiation coating layer is coated on the concave-convex surface, so that the precast block has high emissivity; the radiation heat transfer efficiency of the hearth and the working efficiency of the furnace kiln are improved.
the technical scheme of the utility model as follows:
a prefabricated block for strengthening the radiation heat transfer of a steel rolling heating furnace comprises a base block, wherein the side surface of the base block facing the inside of a hearth is of a concave-convex structure, and a high-radiation material layer is covered on the surface of the concave-convex structure.
preferably, the relief structure comprises a plurality of dimples.
Preferably, the depth of the pits is 10-250mm, and the maximum diameter of the opening is 300 mm.
Preferably, the junction of the pit and the surface of the base block is an arc chamfer.
preferably, the pits are multi-step pits, and step connection positions of the multi-step pits are of arc structures.
preferably, the high-radiation material layer comprises one or more of zirconia, chromium oxide, brown corundum, ferric oxide, silicon carbide and titanium dioxide.
Preferably, the outer shape of the base block includes a square shape and a hexagonal shape.
Preferably, the thickness of the base block is 50-800 mm.
Preferably, the base block is a cuboid or a hexagon, and the length, the width and the thickness of the cuboid are respectively 0.5-2m, 0.5-1.5m and 50-500 mm; the hexagonal surface of the hexagon faces the inner side and the outer side of the hearth, the side length of the hexagon is 0.3-1.2m, and the thickness of the hexagon is 50-500 mm.
Preferably, the base block comprises, by mass, 60% -90% of high-alumina cement, 2% -10% of phosphoric acid or phosphate, 1% -5% of water glass, and 5% -25% of low-cement.
preferably, the base block comprises high-temperature resistant fibers, and the mass fraction of the high-temperature resistant fibers is 0-1%. The advantage of this design is that the high temperature resistant fiber is added during the manufacturing process of the base block to enhance the bonding force.
preferably, the outer side surface of the base block is provided with embedded bolts, the distance between the bolts is larger than 200mm, and the embedding depth is 100-200 mm. The advantage of this design is, adopts the strong coarse thread bolt of lock female power, and the prefabricated section hoist and mount pass through the buried bolt in advance at the furnace roof and install on the girder of headwall, and the installation is simple and efficient.
preferably, the peripheral side edges of the base block are inclined planes, and the inclination angle is 0-45 degrees. The advantage of this design is, at the in-process of installation prefabricated section, the inclined plane can form V-arrangement wedge mouth between the adjacent prefabricated section for the pouring material, can make more firm that the prefabricated section is connected, and the furnace body leakproofness is stronger.
The precast block provided by the utility model is used for directly replacing the inner wall of the furnace chamber of the steel rolling heating furnace, is produced and manufactured by a special mould with a convex structure in the earlier stage, and can ensure the integrity of the precast block and prolong the service life by adopting an integral forming structural design; one surface facing the inner side of the hearth is coated with a layer of high-radiation material with emissivity larger than that of the base block, so that the emissivity of the inner wall of the hearth can be improved.
The beneficial effects of the utility model reside in that:
1. The utility model discloses a prefabricated section structure is unique, realizes the institutional advancement of furnace inner wall, increases the radiant heat transfer area and the emissivity of furnace inner wall. Compared with the traditional hearth inner wall, the utility model can increase the radiant heat transfer by more than 20 percent, improve the output and reduce the fuel consumption.
2. The utility model discloses a prefabricated section practicality is strong, can save the propping up of the inboard template of furnace and establish at the in-process of building the stove, and the in-process of building the stove becomes a whole with the pouring of furnace wall, and the structure is firm.
3. the furnace building process designed by the utility model has the advantages of comprehensive prefabricated structure and integral casting, and has good integrity, air tightness and stability; the site operation is convenient and fast, and the service life is long.
drawings
FIG. 1 is a perspective view of the precast block of the present invention;
FIG. 2 is a front cross-sectional view of the precast block of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
Fig. 4 is a top view of the precast block of the present invention (the pits are arranged in order);
FIG. 5 is a top view of the precast block of the present invention (with the pits staggered);
FIG. 6 is a front cross-sectional view of the precast block of the present invention (multi-step pit);
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a perspective view of the precast block of the present invention;
FIG. 9 is a top view of FIG. 8;
FIG. 10 is a front cross-sectional view of the precast block of the present invention (pre-embedded bolts);
FIG. 11 is a schematic view of the precast block of the present invention during construction and installation;
FIG. 12 is a schematic view of the bottom stable support of the present invention when the prefabricated section is installed on the top of the hearth;
FIG. 13 is a top view of the prefabricated section of the present invention in a hexagonal shape;
wherein: 1. a base block; 2. a pit; 3. a protrusion; 4. and (6) embedding the bolts.
Detailed Description
The present invention will be further described, but not limited to, by the following examples in conjunction with the accompanying drawings.
Example 1:
As shown in fig. 1 to 4, the embodiment provides a precast block for enhancing the radiation heat transfer of a steel rolling heating furnace, which comprises a base block 1, wherein one side surface of the base block 1 is of a concave-convex structure, and a high radiation material layer is arranged on the surface of the concave-convex structure.
Wherein, the thickness of the base block is 50-350mm, and the selection of the specific thickness is determined according to different design schemes. The base block is in a square shape, hexagonal shape and other polygons, and the square shape is preferably selected, so that the production of refractory material manufacturing enterprises is facilitated, and meanwhile, the construction is also facilitated. In this embodiment, the base block is a square base block, and the length, width and thickness thereof are 0.5m, 0.5m and 50 mm.
the concave-convex structure is specifically in a form of a plurality of pits, in the embodiment, the pits are independent from each other and are not connected, and the pits 2 can be arranged in rows and columns (as shown in fig. 4), can also be arranged in a transverse row and staggered manner (as shown in fig. 5), and can also be arranged irregularly. The depth of the pit is 10-250mm, the maximum diameter of the opening is 200mm, and the joints of the edges of the pit and the base block are all arc chamfers (as shown in figures 2 and 3).
The material composition of the whole precast block is the same as that of the inner wall of the hearth, the precast block directly replaces the inner wall of the hearth, the inner wall of the hearth and an inner side template are omitted, the precast block is produced and manufactured in advance in a refractory material manufacturing enterprise by using a special mold, and then the precast block is transported to a furnace building site for construction operation. The base block in the precast block comprises, by mass, 60% -90% of high-alumina cement, 2% -10% of phosphoric acid or phosphate, 1% -5% of water glass, and 5% -25% of low-cement.
The base block comprises high-temperature resistant fibers, and the mass fraction of the high-temperature resistant fibers is less than or equal to 1%. High-temperature resistant fibers are added in the manufacturing process of the base block, so that the binding force of the base block can be enhanced.
the surface of the concave surface structure of the base block is coated with a high-radiation material layer, the high-radiation material layer is uniformly coated on the base block and the concave surface structure, and the high-radiation material layer comprises one or more of zirconia, chromium oxide, brown corundum, ferric oxide, silicon carbide and titanium dioxide, and can be selected according to different use requirements. The concave body is used for enlarging the radiation area, and the high-radiation material layer is used for improving the emissivity.
Example 2:
the precast block for reinforcing the radiation heat transfer of the steel rolling heating furnace as in embodiment 1 is structurally different in that: in this embodiment, the base block is a rectangular parallelepiped base block having a length, width and thickness of 2m, 1.5m and 350 mm.
the pits 2 are multi-step pits, and as shown in fig. 6 and 7, are three-step pits in this embodiment. The radiation area is further increased compared with the pits of embodiment 1 by adopting the structural form of the multi-step pits.
Example 3:
The precast block for reinforcing the radiation heat transfer of the steel rolling heating furnace as in embodiment 1 is structurally different in that: in this embodiment, the edges of the pits are non-circular, similar to a quincunx, and are connected by zigzag arcs, as shown in fig. 8 and 9, so that the radiation heat transfer area can be further increased.
example 4:
The precast block for reinforcing the radiation heat transfer of the steel rolling heating furnace as in embodiment 1 is structurally different in that: the other side surface of the base block is provided with embedded bolts, the distance between the bolts is larger than 200mm, and the embedding depth is 100-200 mm. The precast block provided with the embedded bolt can be hung on the furnace top and is installed on a crossbeam of the top wall through the embedded bolt, and the installation process is simple, convenient and quick. As shown in fig. 10.
Example 5:
the precast block for reinforcing the radiation heat transfer of the steel rolling heating furnace as in embodiment 1 is structurally different in that: the side edges of the periphery of the base block are inclined planes (as shown in figure 10), the inclination angle is 0-45 degrees, and the selection of the specific inclination angle is determined according to the construction requirement. In the process of installing the precast blocks, V-shaped wedge openings can be formed between the adjacent precast blocks by virtue of the inclined planes, and after pouring is carried out, the precast blocks can be connected more firmly.
Example 6:
A process for pouring the inner wall of the hearth of a steel rolling heating furnace by utilizing the precast blocks in the embodiment 1 comprises the following specific operation processes:
(1) Preparing a precast block according to a design scheme, wherein the precast block is produced and manufactured in a refractory material manufacturing enterprise in advance according to the working procedures of proportioning, casting molding, curing, spraying a high-radiation material on one surface, baking and the like, and then is transported to a furnace building site for later use;
(2) Constructing the inner wall of a hearth, replacing an inner furnace building template with a prepared precast block, wherein the concave-convex surface of the precast block faces to the inside of the hearth and is erected and fixed together with an outer template in a mode of a split bolt and a steel pipe support, and a layer of release agent is coated before the outer template is erected;
When the prefabricated blocks are installed, the gaps between the two prefabricated blocks in the upper row and the two prefabricated blocks in the lower row need to be staggered, as shown in fig. 11, the gap between the two prefabricated blocks in the second row is positioned in the middle of the single prefabricated block in the first row, and the gap is tightly filled with a high-temperature adhesive;
(3) The precast blocks with the embedded bolts are sequentially hung on a girder of a top wall of a hearth, stable supports are arranged on the precast blocks in the hearth, the stirred castable is poured from a V-shaped wedge opening (as shown in figure 12), the top wall of the hearth is poured to cover the embedded bolts, the side wall of the hearth is poured from one side far away from the precast blocks, namely, the side wall of the hearth is close to an outer side template, the outer side template is removed after the castable is solidified for 24 hours, and the precast blocks become the inner wall of the hearth and are simultaneously solidified with a furnace wall into a whole.
Construction of a certain iron and Steel works 1#、2#Two walking beam type heating furnaces 1#The heating furnace adopts the utility model discloses the construction of furnace building technology, 2#the heating furnaces are constructed by adopting a traditional furnace building process, and other design parameters of the two heating furnaces are the same. After normal production, the production data of the two heating furnaces are as follows:
From the above data it follows that: 1#The heating furnace not only reduces the hot charging and hot delivery rate, but also reduces the unit consumption of coal gas. Comprehensively considering the hot charging heat transfer rate and the unit consumption of coal gas, 1#Heating furnace ratio 2#The heating furnace can save energy by 10.7 percent. Compared with the inner wall of the traditional hearth, the steel rolling heating furnace obtained by the furnace building process can increase the radiant heat transfer quantity by more than 20 percent, improve the yield and reduce the fuel consumption.
Claims (8)
1. A prefabricated block for strengthening the radiation heat transfer of a steel rolling heating furnace comprises a base block and is characterized in that the side surface of the base block facing the interior of a hearth is of a concave-convex structure, and a high-radiation material layer is covered on the surface of the concave-convex structure.
2. The preform block of claim 1, wherein the relief structure comprises a plurality of dimples.
3. The precast block of claim 2 wherein the junction of the dimple and the surface of the base block is a rounded chamfer.
4. The precast block according to claim 2 or 3, wherein the pit is a multi-step pit, and a step connection part of the multi-step pit has an arc-shaped structure.
5. The precast block of claim 1 wherein the thickness of the base block is 50-800 mm.
6. The precast block according to claim 1, wherein the base block is a rectangular parallelepiped or a hexagonal parallelepiped, and the length, width and thickness of the rectangular parallelepiped are 0.5 to 2m, 0.5 to 1.5m and 50 to 500mm, respectively; the hexagonal surface of the hexagon faces the inner side and the outer side of the hearth, the side length of the hexagon is 0.3-1.2m, and the thickness of the hexagon is 50-500 mm.
7. The precast block according to claim 1, wherein the outer side surface of the base block is provided with embedded bolts, the distance between the bolts is greater than 200mm, and the embedding depth is 100-200 mm.
8. The precast block of claim 1 wherein the peripheral sides of the base block are beveled at an angle of 0-45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920391612.6U CN209783294U (en) | 2019-03-26 | 2019-03-26 | prefabricated block for reinforcing radiation heat transfer of steel rolling heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920391612.6U CN209783294U (en) | 2019-03-26 | 2019-03-26 | prefabricated block for reinforcing radiation heat transfer of steel rolling heating furnace |
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| CN209783294U true CN209783294U (en) | 2019-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945655A (en) * | 2019-03-26 | 2019-06-28 | 山东慧敏科技开发有限公司 | A kind of prefabricated section and furnace building process for strengthening heater for rolling steel radiant heat transfer |
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2019
- 2019-03-26 CN CN201920391612.6U patent/CN209783294U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945655A (en) * | 2019-03-26 | 2019-06-28 | 山东慧敏科技开发有限公司 | A kind of prefabricated section and furnace building process for strengthening heater for rolling steel radiant heat transfer |
| CN109945655B (en) * | 2019-03-26 | 2024-05-24 | 山东慧敏科技开发有限公司 | Prefabricated block for reinforcing radiation heat transfer of steel rolling heating furnace and furnace building process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Prefabricated block for strengthening radiation heat transfer of steel rolling heating furnace Effective date of registration: 20220310 Granted publication date: 20191213 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: SHANDONG HUIMIN SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2022980002330 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230221 Granted publication date: 20191213 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: SHANDONG HUIMIN SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2022980002330 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A prefabricated block for strengthening radiation heat transfer of steel rolling heating furnace Effective date of registration: 20230224 Granted publication date: 20191213 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: SHANDONG HUIMIN SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2023980033303 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |