CN112146450A - Tilting continuous charging electric arc furnace scrap steel preheating device with baffle - Google Patents
Tilting continuous charging electric arc furnace scrap steel preheating device with baffle Download PDFInfo
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- CN112146450A CN112146450A CN202011036485.1A CN202011036485A CN112146450A CN 112146450 A CN112146450 A CN 112146450A CN 202011036485 A CN202011036485 A CN 202011036485A CN 112146450 A CN112146450 A CN 112146450A
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- section body
- preheating
- preheating section
- flue gas
- electric arc
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D13/002—Preheating scrap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
- F27B3/085—Arc furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/18—Arrangements of devices for charging
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses an inclined continuous feeding electric arc furnace scrap steel preheating device with baffles, wherein a preheating section body is arranged in an inclined mode, the inclination angle of the preheating section body can be adjusted, a feed inlet is higher than a flue gas inlet, a plurality of baffles are arranged on the upper inner wall of the preheating section body, and a conveying roller way is arranged on the lower inner wall of the preheating section body. When the invention is adopted for preheating, materials are conveyed through the conveying roller way, so that continuous feeding is realized; the preheating section body is obliquely arranged, so that the use area of a workshop is reduced; the angle of the preheating section body can be adjusted, and the preheating section can flexibly deal with the addition of different types of steel scraps; high-temperature flue gas is introduced through a lower flue gas inlet, and materials enter through a higher feed inlet, so that the heat exchange time of the high-temperature flue gas and the materials is prolonged; the high-temperature flue gas moves towards the material under the action of the baffle, so that the contact area of the high-temperature flue gas and the material is increased, and the preheating temperature of the material is greatly increased.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a scrap steel preheating device of an inclined continuous charging electric arc furnace with a baffle.
Background
It is well known that electric arc furnace steelmaking has many advantages in terms of environmental protection, investment, and efficiency. At present, more than 95% of the electric steel yield in the full-sphere range is produced and prepared by an electric arc furnace. The modern electric arc furnace steel making mostly adopts scrap steel preheating-continuous feeding operation, and the scrap steel is preheated by high-temperature flue gas, theoretically, the electric energy is saved by 20kWh/t when the scrap steel preheating temperature is increased by 100 ℃, and if the effective utilization rate of the energy is considered, generally, the electric energy is saved by about 15kWh/t when the scrap steel preheating temperature is increased by 100 ℃. Therefore, scrap steel preheating is one of important development directions of the energy-saving technology of the electric arc furnace, and has important significance for improving the scrap steel preheating temperature and saving energy and reducing consumption in short steelmaking process. Meanwhile, the furnace cover of the traditional electric arc furnace is opened for feeding for many times in the smelting process, so that waste can be brought away by waste gas due to large heat in the electric arc furnace, according to measurement and calculation, the heat loss of the traditional electric arc furnace is about 10-20 kWh/t every time the electric arc furnace is fed, the furnace cover of the continuous feeding electric arc furnace can be closed in the whole process of smelting, the problems of smoke dust and heat loss in the smelting process of the traditional electric arc furnace can be effectively solved, the smelting period of the electric arc furnace is shortened, the power consumption is reduced, the energy is saved, and the. Thus, continuous-feed electric arc furnaces are one of the important directions in the future development of electric arc furnaces.
At present, the scrap preheating device of the electric arc furnace mainly has two forms: vertical and horizontal. The vertical scrap steel preheating efficiency is higher, but the equipment is huge and complex, the requirement on the elevation of a factory building is high, and the vertical scrap steel preheating equipment is difficult to adapt to the transformation of an old electric arc furnace steelmaking workshop, so that the one-time investment is huge. The horizontal scrap steel preheating device has the advantages of low requirement on the height of a factory building, good smooth production condition, small power grid impact, reliable and controllable feeding and the like, is widely applied industrially at present, and is most representative of a Consteel electric arc furnace. But the scrap steel preheating temperature of the horizontal electric arc furnace is lower, the preheating channel is longer, and higher requirements are provided for the area of a factory building, and the practical production shows that the temperature of the scrap steel at the position 600-700 mm away from the surface of the Consteel electric arc furnace is less than 100 ℃, the energy-saving effect is poor, and the heat transfer efficiency is low. The chinese patent publication No. CN101545724B discloses an electric arc furnace scrap preheating system, which utilizes the residual heat of high-temperature flue gas to preheat the steelmaking raw materials, but adopts a basket to feed in batches, and is difficult to realize continuous feeding. Chinese patent publication No. CN108396100A discloses a scrap preheating device for a horizontal continuous-feed electric arc furnace, which aims to solve the problem of low preheating temperature of the horizontal continuous-feed scrap, and adopts an igniter to burn coal and natural gas to release heat so as to increase the preheating temperature of the scrap.
Disclosure of Invention
The invention aims to provide a scrap steel preheating device of an inclined continuous charging electric arc furnace with a baffle, which is used for solving the problems of low preheating temperature, uneven preheating effect and high requirement on plant area of horizontally and continuously charging scrap steel.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an inclined continuous-feeding electric arc furnace scrap steel preheating device with baffles, which comprises a preheating section body, a conveying roller way and a plurality of baffles, wherein a feeding port is formed in the front end of the preheating section body, a flue gas inlet is formed in the rear end of the preheating section body, the preheating section body is arranged in an inclined mode, the inclination angle of the preheating section body can be adjusted, the feeding port is higher than the flue gas inlet, a plurality of the baffles are arranged on the upper inner wall of the preheating section body, and the conveying roller way is arranged on the lower inner wall of the preheating section body.
Preferably, the plurality of baffles are uniformly distributed along the length direction of the preheating section body, and the heights of the plurality of baffles are sequentially increased along the moving direction from the flue gas inlet to the feed inlet.
Preferably, the height of the preheating section body is h, the number of the baffles is five, and the heights of the five baffles along the direction from the flue gas inlet to the feed inlet are 0.1h, 0.2h, 0.3h, 0.4h and 0.5h in sequence.
Preferably, the baffle is curved towards the flue gas inlet, and the radian of the baffle is 30-60 degrees.
Preferably, a plurality of vent holes are uniformly formed in the conveying roller way, the size of each vent hole is smaller than that of the material, a cavity is formed between the conveying roller way and the inner wall of the preheating section body below the conveying roller way, the preheating section body is provided with a bottom exhaust port communicated with the cavity, and bottom air draft equipment is arranged at the position of the bottom exhaust port.
Preferably, a top exhaust port is arranged between the two baffles close to the feeding port, and a top air exhaust device is arranged at the top exhaust port.
Preferably, the preheating section further comprises an angle adjusting mechanism, and the preheating section body is arranged on the angle adjusting mechanism.
Preferably, the inclination angle of the preheating section body is A, and A is B-C (5-8 degrees), wherein B is the friction angle of the material to the conveying roller way, and C is the porosity of the material.
Compared with the prior art, the invention has the following technical effects:
when the invention is adopted for preheating, materials are conveyed through the conveying roller way, so that continuous feeding is realized; the angle of the preheating section body can be adjusted, and the preheating section can flexibly deal with the addition of different types of steel scraps; the preheating section body is obliquely arranged, so that the use area of a factory building is reduced; high-temperature flue gas is introduced through a lower flue gas inlet, and materials enter through a higher feed inlet, so that the natural movement direction is utilized, and the heat exchange time of the high-temperature flue gas and the materials is prolonged; the high-temperature flue gas moves towards the material under the action of the baffle, so that the contact area between the high-temperature flue gas and the material is increased, meanwhile, the baffle is favorable for downward movement of the high-temperature flue gas, and the preheating temperature of the bottom material is greatly increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a scrap preheating apparatus for a tilting continuous feed electric arc furnace with baffles according to the present invention;
FIG. 2 is a schematic illustration of the position of the baffle, material, cavity and bottom vent of the present invention;
FIG. 3 is a schematic view of a transport table according to the present invention;
wherein, 1: a preheating section body; 2: a conveying roller way; 3: a feed inlet; 4: a flue gas inlet; 5: material preparation; 6: a baffle plate; 7: a cavity; 8-a: a top air extraction device; 8-b: a bottom air extraction device; 9-a: a top exhaust port; 9-b: a bottom exhaust port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The invention aims to provide a scrap steel preheating device of an inclined continuous charging electric arc furnace with a baffle, which is used for solving the problems of low preheating temperature, uneven preheating effect and high requirement on plant area of horizontally and continuously charging scrap steel.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-3: the embodiment provides a continuous reinforced electric arc furnace scrap steel preheating device of tilting of taking baffle, including preheating section body 1, transportation roll table 2 and a plurality of baffle 6, the front end of preheating section body 1 is provided with feed inlet 3, the rear end of preheating section body 1 is provided with flue gas entry 4, the inclination that preheats section body 1 slope setting and preheating section body 1 can be adjusted, feed inlet 3 is higher than flue gas entry 4, a plurality of baffles 6 set up on the inner wall that preheating section body 1 is located the top, transportation roll table 2 sets up on the inner wall that preheating section body 1 is located the below. When the embodiment is adopted for preheating, the materials 5 are conveyed through the conveying roller way 2, so that continuous feeding is realized; the preheating section body 1 is obliquely arranged, so that the use area of a factory building is reduced; high temperature flue gas lets in through lower flue gas entry 4, and material 5 gets into through higher feed inlet 3, has utilized natural direction of motion, has increased the heat transfer time of high temperature flue gas and material 5, and the high temperature flue gas moves to material 5 under the effect of baffle 6, has increased the area of contact of high temperature flue gas with material 5, and baffle 6 has delayed the motion of high temperature flue gas simultaneously, has increased the heat transfer time of high temperature flue gas once more, has improved the preheating temperature of bottom material 5 greatly.
Specifically, in this embodiment, a plurality of baffles 6 are evenly distributed along the length direction of the preheating section body 1, and the heights of the plurality of baffles 6 increase progressively in sequence along the moving direction from the flue gas inlet 4 to the feed inlet 3. The height of the preheating section body 1 is h, the baffle 6 is preferably five, and the heights of the five baffles 6 along the direction from the flue gas inlet 4 to the feed inlet 3 are 0.1h, 0.2h, 0.3h, 0.4h and 0.5h in sequence.
In this embodiment, the baffle 6 is curved toward the flue gas inlet 4, the radian of the baffle 6 is 30-60 degrees, preferably 30 degrees, and the baffle 6 curved toward the flue gas inlet 4 enables the high-temperature flue gas to scatter when encountering the baffle 6 and fall on the material 5 along the curved direction of the baffle 6.
In the embodiment, a plurality of vent holes are uniformly formed in the conveying roller way 2, the size of each vent hole is smaller than that of the material 5, a cavity 7 is formed between the conveying roller way 2 and the inner wall of the preheating section body 1 below the conveying roller way, the preheating section body 1 is provided with a bottom exhaust port 9-b communicated with the cavity 7, and a bottom air draft device 8-b is arranged at the bottom exhaust port 9-b. Under the action of the bottom air suction equipment 8-b, high-temperature flue gas enters the gap of the material 5 and is discharged from the bottom air outlet 9-b, and the arrangement of the conveying roller table 2, the cavity 7 and the bottom air suction equipment 8-b avoids the problem that only the upper material 5 is preheated, so that the material 5 is fully and uniformly preheated. And, the diameter of each transport roller is far greater than the size of material 5 on the transportation roll table 2 for material 5 is transporting the in-process, and the motion of transport roller can play certain upset effect to material 5, has produced beneficial effect to the abundant even preheating of material 5 equally.
In the embodiment, a top exhaust port 9-a is arranged between the two baffles 6 close to the feed inlet 3, and a top air draft device 8-a is arranged at the top exhaust port 9-a.
In this embodiment, still include angle adjustment mechanism, preheat section body 1 and set up on angle adjustment mechanism. Specifically, angle adjustment mechanism sets up in the below of the preheating section body 1 that is close to feed inlet 3, and angle adjustment mechanism is the pneumatic cylinder, accomplishes the regulation to preheating section body 1 inclination through the flexible of pneumatic cylinder. In this embodiment, the inclination angle of the preheating section body 1 is a, where a is B-C (5 ° to 8 °), where B is the friction angle of the material 5 to the conveying roller table 2, and C is the porosity of the material 5.
When the preheating is carried out by adopting the embodiment, high-temperature flue gas generated by the electric arc furnace enters from the flue gas inlet 4, the natural movement direction of the high-temperature flue gas is upward, the preheating section body 1 with the inclination angle of 30 degrees can increase the heat exchange time between the high-temperature flue gas and the material 5 (scrap steel), the high-temperature flue gas moves towards the material under the action of the baffle 6 and the top air-pumping device 8-a, the contact area between the high-temperature flue gas and the material is increased, meanwhile, the bottom air-pumping device 8-b and the baffle 6 cooperatively act to force part of the high-temperature flue gas to penetrate through the material layer to move downwards, the contact area between the flue gas and the bottom material 5 and the heat exchange time can be effectively increased, the preheating efficiency of the material 5 is greatly improved, the preheating temperature of the bottom material 5 is improved, part of the high-temperature flue gas is discharged through the bottom air-pumping device 8-b after preheating the scrap steel, the preheated material 5 enters the electric arc furnace through a flue gas inlet 4 to be melted. In the embodiment, the operation of preheating the material 5 and continuously feeding is adopted, so that the production and smelting rhythm of a modern electric arc furnace is met; only depending on the high-temperature flue gas to preheat the material 5, no auxiliary energy is needed to be input; the device has no over-high requirements on the elevation and the overground area of a factory building, has simple structure and less investment, and is suitable for the transformation of a horizontal material 5 preheating-continuous feeding device; the preheating efficiency of the material 5 is high and uniform, the preheating temperature of the material 5 can reach 430-450 ℃, the production rhythm of the electric arc furnace is accelerated, and the production cost is effectively reduced.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, the specific embodiments and the application range may be changed according to the idea of the present invention. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a take tilting continuous charging electric arc furnace scrap steel preheating device of baffle which characterized in that: including preheating section body, transportation roll table and a plurality of baffle, the front end of preheating section body is provided with the feed inlet, the rear end of preheating section body is provided with the flue gas entry, the slope of preheating section body sets up just the inclination of preheating section body can be adjusted, the feed inlet is higher than the flue gas entry is a plurality of the baffle sets up preheating section body is located on the inner wall of top, the transportation roll table sets up preheating section body is located on the inner wall of below.
2. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: the plurality of baffles are uniformly distributed along the length direction of the preheating section body, and the heights of the plurality of baffles are sequentially increased along the movement direction from the flue gas inlet to the feed inlet.
3. The scrap preheating apparatus for a tilting continuous-charging electric arc furnace having a baffle according to claim 2, wherein: the height of the preheating section body is h, the number of the baffles is five, and the heights of the five baffles along the direction from the flue gas inlet to the feed inlet are 0.1h, 0.2h, 0.3h, 0.4h and 0.5h in sequence.
4. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: the baffle is bent towards the flue gas inlet, and the radian of the baffle is 30-60 degrees.
5. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: the conveying roller way is uniformly provided with a plurality of vent holes, the size of each vent hole is smaller than that of a material, a cavity is arranged between the conveying roller way and the inner wall of the preheating section body below the conveying roller way, the preheating section body is provided with a bottom exhaust port communicated with the cavity, and a bottom air draft device is arranged at the position of the bottom exhaust port.
6. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: and a top exhaust port is arranged between the two baffles close to the feed inlet, and a top air pumping device is arranged at the position of the top exhaust port.
7. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: the preheating section body is arranged on the angle adjusting mechanism.
8. The scrap preheating apparatus for an inclined continuous-charging electric arc furnace with a baffle according to claim 1, wherein: the inclination angle of the preheating section body is A, A is B-C (5-8 degrees), wherein B is the friction angle of the material to the conveying roller way, and C is the porosity of the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011036485.1A CN112146450A (en) | 2020-09-28 | 2020-09-28 | Tilting continuous charging electric arc furnace scrap steel preheating device with baffle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011036485.1A CN112146450A (en) | 2020-09-28 | 2020-09-28 | Tilting continuous charging electric arc furnace scrap steel preheating device with baffle |
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| CN112146450A true CN112146450A (en) | 2020-12-29 |
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| CN202011036485.1A Pending CN112146450A (en) | 2020-09-28 | 2020-09-28 | Tilting continuous charging electric arc furnace scrap steel preheating device with baffle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115595399A (en) * | 2022-09-07 | 2023-01-13 | 中冶长天国际工程有限责任公司（Cn） | Process and system for hot charging of scrap steel in cooperation with direct reduced iron |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090066A (en) * | 2000-09-19 | 2002-03-27 | Daido Steel Co Ltd | Scrap preheating type electric steel making furnace |
| CN101825396A (en) * | 2010-05-12 | 2010-09-08 | 中冶赛迪工程技术股份有限公司 | Device for preheating and conveying scrap steel |
| EP2270240A2 (en) * | 2009-07-03 | 2011-01-05 | SMS Siemag Aktiengesellschaft | Charging device and method for a melting furnace |
| CN202393244U (en) * | 2011-12-23 | 2012-08-22 | 河南太行全利重工股份有限公司 | Efficient material preheating conveyor |
| CN206656609U (en) * | 2017-02-16 | 2017-11-21 | 中冶赛迪工程技术股份有限公司 | A kind of hopper |
| CN108396100A (en) * | 2018-03-19 | 2018-08-14 | 东北大学 | A kind of horizontal continuity charging steel scrap preheating device of electric arc furnace and application method |
-
2020
- 2020-09-28 CN CN202011036485.1A patent/CN112146450A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002090066A (en) * | 2000-09-19 | 2002-03-27 | Daido Steel Co Ltd | Scrap preheating type electric steel making furnace |
| EP2270240A2 (en) * | 2009-07-03 | 2011-01-05 | SMS Siemag Aktiengesellschaft | Charging device and method for a melting furnace |
| CN101825396A (en) * | 2010-05-12 | 2010-09-08 | 中冶赛迪工程技术股份有限公司 | Device for preheating and conveying scrap steel |
| CN202393244U (en) * | 2011-12-23 | 2012-08-22 | 河南太行全利重工股份有限公司 | Efficient material preheating conveyor |
| CN206656609U (en) * | 2017-02-16 | 2017-11-21 | 中冶赛迪工程技术股份有限公司 | A kind of hopper |
| CN108396100A (en) * | 2018-03-19 | 2018-08-14 | 东北大学 | A kind of horizontal continuity charging steel scrap preheating device of electric arc furnace and application method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115595399A (en) * | 2022-09-07 | 2023-01-13 | 中冶长天国际工程有限责任公司（Cn） | Process and system for hot charging of scrap steel in cooperation with direct reduced iron |
| CN115595399B (en) * | 2022-09-07 | 2023-11-14 | 中冶长天国际工程有限责任公司 | Process and system for hot charging of scrap steel by cooperation of preheating and direct reduction of iron |
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