CN208071737U - Continuous charging arc furnace system - Google Patents
Continuous charging arc furnace system Download PDFInfo
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- CN208071737U CN208071737U CN201820431947.1U CN201820431947U CN208071737U CN 208071737 U CN208071737 U CN 208071737U CN 201820431947 U CN201820431947 U CN 201820431947U CN 208071737 U CN208071737 U CN 208071737U
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- conveyor belt
- arc furnace
- electric arc
- section conveyor
- preheating section
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The utility model provides continuous charging arc furnace system, including electric arc furnaces, conveyor unit, driving unit, closed cell and air-flow adjust unit.Continuous charging arc furnace system described in the utility model, its smelting molten steel has high production capacity, relatively low and adjustable smelting cycle, minimum energy consumption cost, CO conversion is high, utilization rate is high, heat exchange effect is good, production capacity is good, sound level is low, dust emission is few, the advantages that being conducive to environmental protection, meet national requirements for environmental protection.
Description
Technical Field
The utility model belongs to the technical field of electric arc furnace equipment, concretely relates to reinforced electric arc furnace system in succession.
Background
Carbon monoxide can appear in the flue gas, and the flue gas heat is very high moreover, but carbon monoxide low conversion, low-usage, the heat exchange effect is poor, the productivity is low, the noise level is high, the dust discharges abundantly, is unfavorable for the environmental protection, does not accord with national environmental protection requirement.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a continuous feeding electric arc furnace system, overcome above-mentioned defect.
In order to solve the technical problem, the utility model provides a continuous charging electric arc furnace system, which comprises an electric arc furnace, a conveyor belt unit, a driving unit, a sealing unit and an airflow adjusting unit,
the conveyor belt unit comprises a feeding section conveyor belt, a preheating section conveyor belt and a connecting trolley, the feeding section conveyor belt and the preheating section conveyor belt are hung on a plurality of hanging rods, the hanging rods are hung on a base of the supporting mechanism, the tail end of the feeding section conveyor belt is connected with the head end of the preheating section conveyor belt, the tail end of the preheating section conveyor belt is connected with the head end of the connecting trolley, the tail end of the connecting trolley is connected with the electric arc furnace,
the driving unit comprises a tail end driving device and an intermediate driving device, the tail end driving device is arranged at the head end of the feeding section conveyor belt, the tail end driving device drives the feeding section conveyor belt to vibrate, the intermediate driving device is arranged at the joint of the tail end of the feeding section conveyor belt and the head end of the preheating section conveyor belt, the intermediate driving device drives the preheating section conveyor belt to vibrate,
the closed unit comprises a smoke hood and a water-cooling smoke hood, the smoke hood is arranged on the preheating section conveying belt, the water-cooling smoke hood is arranged on the connecting trolley,
the air flow adjusting unit comprises a dust removing device, a dynamic sealing device and a cold air mixing adjusting system, the dust removing device is arranged on the smoke hood and is close to the head end of the preheating section conveying belt, the dynamic sealing device is arranged above the head end of the preheating section conveying belt, and the cold air mixing adjusting system is arranged on the water-cooling smoke hood.
As an optimal scheme of continuous feeding electric arc furnace system, the cross-section of reinforced section conveyer belt and preheating section conveyer belt is trapezoidal, the upper portion of reinforced section conveyer belt and the upper portion of preheating section conveyer belt all are equipped with the shirt rim structure.
As an optimized scheme of the continuous charging electric arc furnace system, the middle driving device and the end driving device are vibration exciters.
As an optimized scheme of continuous charging electric arc furnace system, the water-cooling petticoat pipe with the junction of the import of electric arc furnace is equipped with the baffling board, the baffling board is fixed in the water-cooling petticoat pipe.
As an optimized scheme of the continuous charging electric arc furnace system, the continuous charging electric arc furnace system further comprises a pressure device, and the pressure device is connected with the electric arc furnace.
As an optimized scheme of continuous charging electric arc furnace system, pressure device is from last down divide into the three-layer in proper order, is transformer room, hyperbaric chamber and hydraulic pressure room respectively.
Compared with the prior art, the utility model provides a continuous feeding electric arc furnace system compares with the electric stove that uses traditional technology or other steelmaking technique, and its smelt molten steel has high productivity, relatively lower and adjustable smelting cycle, minimum energy consumption cost, carbon monoxide conversion rate are high, the high-usage, and the heat exchange is effectual, and the productivity is good, and noise level is low, dust emission is few, does benefit to the environmental protection, accords with advantages such as national environmental protection requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced 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 that other drawings can be obtained according to these drawings without inventive labor. Wherein,
fig. 1 is a schematic structural diagram of the continuous charging electric arc furnace system of the present invention.
Wherein: the device comprises an electric arc furnace 1, a charging section conveyor belt 2, a preheating section conveyor belt 3, a connecting trolley 4, a suspender 5, a base 6, a middle driving device 7, a tail end driving device 8, a smoke hood 9, a water-cooling smoke hood 10, a dedusting device 11, a dynamic sealing device 12, a cold air mixing adjusting system 13, a skirt structure 14, a baffle plate 15, a pressure device 16, a transformer chamber 161, a high-pressure chamber 162 and a hydraulic chamber 163.
Detailed Description
Continuous reinforced electric arc furnace system, it includes: an electric arc furnace 1, a conveyor unit (not shown), a drive unit (not shown), a closing unit (not shown) and a gas flow regulating unit (not shown).
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the following embodiments.
First, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Secondly, the utility model discloses utilize structural schematic diagram etc. to carry out the detailed description, when detailing the embodiment of the utility model, for the convenience of explanation, the schematic diagram that shows continuous feeding electric arc furnace system structure can not do local enlargement according to general proportion, moreover the schematic diagram is the example only, and it should not limit here the scope of the protection of the utility model. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
The continuous charging arc furnace smelting process is a process in which an arc furnace can continuously preheat scrap, pig iron and charge, and simultaneously melt and refine these metal materials.
The principle of the smelting process of the continuous charging electric arc furnace is to efficiently use electric furnace flue gas as a heat source to preheat the scrap steel charged into the electric arc furnace. In the continuous scrap steel feeding process, sensible heat of electric furnace flue gas and chemical heat generated by carbon monoxide combustion in the flue gas are optimized and used.
Combustible materials carried by the metal materials are combusted in the preheating area, and heat is provided for preheating the metal materials and maintaining the required purification temperature of the dust falling chamber after the preheating section.
The preheating process is completed in a preheating section. When the flue gas of the electric furnace enters the preheating section conveyor belt 3 from the electric furnace, the heat generated by secondary combustion of carbon monoxide in the preheating section is controlled by controlling the doping of ambient air. Through the research on the mixing of the ambient air and the flue gas, the shape of the preheating section smoke hood 9 is correctly designed to improve and enhance the efficiency of secondary combustion.
The incorporation of ambient air is controlled by the opening of a secondary combustion air flap which is located in the first section of the preheating section near the electric furnace. The opening degree of the turning plate is automatic, and the secondary combustion control unit controls the opening degree according to the temperature of the flue gas and the oxygen content.
The carbon monoxide oxidation reaction produces a large exotherm which increases the temperature of the flue gas and provides the majority of the heat from the electric furnace to the preheating section. The flue gas flow moves along the scrap steel feeding direction, and the scrap steel is conveyed by the water-cooling disc in the preheating section channel. Heat is transferred to the moving scrap by convection and radiation and can heat the scrap to a temperature of about 500 c. Because of the extra heat generated in the preheating section, the temperature of the flue gas leaving the preheating section is about 800-900 ℃.
The carbon source for oxygen blowing in the molten pool is partially from scrap metal material-pig iron, molten iron, cast iron, scrap iron or coke powder added into the molten pool. In the continuous feed arc furnace process, the carbon, except for the carbon carried away by the molten steel, is used entirely for the production of foamy slag or as a preheating stage fuel.
Oxygen blown into the furnace by the furnace wall oxygen lance plays an important role in the continuous charging electric arc furnace process:
the oxygen blast produces a proportion of carbon monoxide which is the primary fuel for the preheating section of the scrap, sufficient carbon is required in the bath to produce the desired proportion of carbon monoxide, and the furnace must be properly sealed to prevent post combustion of the carbon monoxide in the furnace.
The foamed slag is of vital importance and it must be ensured that the vast majority of the heat generated by the electric arc is transferred to the bath. The whole bath is blown with oxygen to generate carbon monoxide and to maintain a balanced foamy slag, which is also essential for protecting the arc from radiation to refractory. Furthermore, the correct composition of the foamed slag can greatly limit corrosion of the refractory lining.
The collision effect of the oxygen jets penetrates the entire bath and promotes the circular movement of the bath and thus increases the bath temperature and chemical composition uniformity. In addition, the new design of the flue gas outlet aims at optimizing the flue gas flow in the preheating section and improving the heat exchange efficiency of the waste steel. A flue gas analyzer was also installed to perform material and energy balance calculations for the entire furnace. The heat quantity transmitted to the scrap steel on the heating conveying belt can be calculated through other measured values such as smoke components, the weight of the molten steel in the electric furnace and the like, and then the temperature of the scrap steel at the inlet of the electric furnace is calculated. Therefore, the temperature of the scrap can be optimized and fed into the electric furnace at as high a temperature as possible, thereby reducing the power consumption to a very low level.
The conveyor system of a continuous-feed electric arc furnace generally consists of several conveyor belts connected in series:
one or more feeding section conveyors 2, a preheating section conveyor 3, a connecting trolley 4, all of which convey the scrap in a slowly forward and rapidly backward oscillating manner, such movement allowing the scrap to move forward with the conveyor and slide over the surface of the conveyor as it oscillates backward. As a result, the scrap moves toward the electric furnace. To achieve vibration, each conveyor belt is suspended from a series of booms 5, and the booms 5 are suspended from the base 6 of the support mechanism.
The belt motion of a continuous-feed electric arc furnace is generated by drive units of two different types: an end drive 8 and an intermediate drive 7. The end driving means 8 may be installed at the beginning of the first stage of the feeding conveyor 2, and the intermediate driving means 7 is typically installed at the connecting position of the feeding conveyor 2 and the preheating conveyor 3. All the conveying belts are trapezoidal in section and made of special wear-resistant carbon steel plates. The preheating zone conveyor 3 and the connecting trolley 4 are water-cooled. The upper part of the feeding section conveyor belt 2 is protected by a skirt structure 14 so that the crown block can feed scrap steel and slide into the conveyor belt. The lower part of the conveyor belt is reinforced by beam frames.
The preheating section conveyor belt 3 is covered by a smoke hood 9 lined with refractory material, the flue gas of the electric furnace is pumped by a dust removal device 11 and flows in the smoke hood 9 in the opposite direction of the electric furnace, thereby preheating the metal material. The lower part of the conveyor belt is reinforced by beam frames. The connection trolley 4 is covered by a water-cooled hood 10, because this region is closer to the electric arc furnace 1 and the flue gas temperature is higher.
The top of the water-cooling smoke hood 10 is provided with a cold air mixing adjusting system 13, and the control operation is carried out through the measurement of the temperature and the oxygen content of the continuous charging electric arc furnace 1: the aim is to completely burn the carbon monoxide in the flue gas and convert it into heat to heat the scrap.
Between the feeding section conveyor 2 and the preheating section conveyor 3 there is usually a dynamic sealing device 12 with a fan to avoid sucking in ambient air from the conveyor openings.
Another notable feature of continuous-feed electric arc furnaces is a baffle 15 along the heating conveyor between the outlet water-cooled hood 10 and the inlet to the electric arc furnace 1, as shown in fig. 1. These baffles 15 enhance the effect of direct "natural" heating of the scrap by the flue gases of the electric furnace. This is true in fact, as the baffles 15 enhance the heat exchange by increasing the convection to the scrap.
Such as: average scrap temperature for a 18 m conveyor belt/section, two different curves show how the baffles allow higher scrap temperatures to enter the furnace. It is noted that this shows the average temperature of the scrap, and in fact the upper layer of scrap is at a higher temperature than the lower layer of scrap, since it is closer to the hot flue gases.
This continuous charging smelting process is in any case more efficient from an economic point of view.
It should be understood by those skilled in the art that one of the features or objects of the present invention is to: the utility model provides a continuous charging electric arc furnace system has following advantage:
1. raw materials. It can be said that the most important advantage of a continuous-feed electric arc furnace is that there are no special requirements for the metal feedstock in terms of economic efficiency. In view of this, users can purchase low-density scrap (without volume limitation) and less scrap (better metal yield), thereby significantly reducing raw material costs.
Continuous feed operation allows a high flexibility, and DRI, HBI, liquid or solid pig iron can be fed.
Generally, scrap and HBI can be charged directly from a continuous charging electric arc furnace, DRI can be charged continuously from the top of the furnace, and molten iron can be charged continuously through a hot metal charging device.
Under the condition of high proportion of raw material molten iron, the continuous charging electric arc furnace can further improve the process performance of the electric furnace.
2. And (4) capacity. The higher capacity per MW of transformer capacity comes from lower energy consumption, higher power rates (power-on/smelt cycles), and a "flatter" power curve. Also, maintenance downtime is minimal due to flat bath operation. Generally, the capacity increase of a "conventional" electric arc furnace modified to a continuous feed electric arc furnace is about 20% to 30% and no modification of the electric and dust removal equipment is required.
3. Consumption and energy conservation. Compared with the electric arc furnace operated in the traditional mode, the continuous charging electric arc furnace has the advantages that the energy is saved because of preheating of scrap steel, refining mode of continuous charging, stable electric arc and covering of foam slag, high heat transfer efficiency from the electric arc to a molten pool, and reduced heat loss to refractory materials and water cooling plates of a furnace wall and a furnace cover.
In addition, because the furnace cover is not opened usually, not only the charging time of the material basket is saved, but also the power loss of heat radiation to the ambient air is saved.
Comparison of two power transfers: direct energy transfer from the electrode to the scrap carries out smelting (top-feed arc furnace) and bath immersion smelting (continuous-feed arc furnace).
4. Electric arc furnace transformer power
In the continuous smelting process of the continuous charging arc furnace, the use of the available transformer power is more efficient: there is no loss of active power due to scrap melting and no loss of time due to charging. Thus, for the same hour capacity, a lower transformer power is required than in a conventional top-fed arc furnace. This means that the transformer investment costs are reduced and the investment costs of the SVC can generally be saved.
5. Consumption of energy kWh
Since the continuous charging arc furnace requires lower installed power and the power consumption is significantly reduced, the unit price is reduced compared to the conventional arc furnace with the same capacity when the electric power company signs the price.
6. Consumption of electrode
The reduction in electrode consumption brought about by continuous-feed electric arc furnaces is due to:
lower electrode current reduces consumption;
more sure that there is no electrode breakage (due to flat bath operation);
due to the reduction atmosphere in the furnace, the thermal electrode is prevented from being exposed to ambient air (compared with the traditional batch charging and furnace cover opening), and the consumption is reduced;
higher productivity.
7. scrap-Steel yield
Continuous feed electric arc furnace production can increase scrap to liquid steel yields by 1.0% to 2.0% due to the reduced FeO concentration in the slag. In continuous feed arc furnace production, the bath is continuously in refining mode and the carbon concentration is appropriate. The direct continuous reaction of molten steel and slag maintains the concentration of FeO in the slag at a lower level to achieve equivalent equilibrium with the carbon concentration of the molten bath.
In conventional electric or shaft furnace operation, the bath is in refining mode for only 10-15 minutes at the end of the heat, which is not sufficient to reduce the FeO in the slag to the same level as in continuous feed electric arc furnace operation.
The total dust reduction is due to the flat bath mode of operation (no basket smelting and oxygen lance cutting scrap), and also due to the low flue gas velocity in the preheating section, a large amount of dust is deposited in the scrap and melted again in the furnace.
8. Nitrogen inclusion
The continuous feed electric arc furnace system can reduce the nitrogen content in the molten steel because the foamed slag prevents air from being ionized by the electric arc.
9. Minimizing grid fluctuations (flicker)
Unlike other conventional batch charging electric arc furnaces, the constant flat bath operation of a continuous charging electric arc furnace avoids electrode shorting and stabilizes the arc. Therefore, there are no reactive power peaks and flicker impact is very low for the grid, and even in relatively weak grid conditions, expensive static var compensators (dynamic compensation SVC) are usually not needed.
Four, the environmental protection advantage of the continuous charging electric arc furnace
The escape of flue gas and dust from the charging basket is eliminated. Because the furnace cover is closed all the time and the negative pressure in the furnace is generated in the whole process during the feeding of the conveyor belt, the working environment is cleaner.
The process of smelting in a flat bath covered with foamy slag minimizes the dust production, while some of the dust produced is deposited in the preheating zone and is returned to the furnace with the scrap. For example, in the Gerdau Charlotte (U.S. plant), using a continuous-feed electric arc furnace system, dust production is reduced from 16kg/t for conventional batch charging to 11kg/t, by about 30%.
Compared to a batch-fed electric furnace, the noise level is significantly reduced since the arc is always on a flat bath and covered by foamy slag.
1. Dust emission
The most significant effect of the continuous charging arc furnace technology is the achievement of a cleaner working environment, since the furnace lid is closed all the time during the continuous charging and the furnace is under negative pressure throughout the process.
The dust and soot during charging of the basket is eliminated and smelting of the bath under the covering of the foamy slag minimizes the generation of dust, and a part of the generated dust is deposited in the preheating section and is charged into the furnace again together with the scrap. Compared with the traditional batch charging process, the continuous charging electric arc furnace system in the existing equipment can reduce about 30% of dust.
Because the furnace cover is rarely opened for charging, the number of dust-removing cloth bags required is small compared with the traditional or batch charging process. The dust removal fan power can be lower.
2. Noise level
Compared to any batch-fed arc furnace, the noise level is extremely low, since the arc is always covered by foamy slag on a flat bath. Thus eliminating the need for kennel for noise control. The reasons for noise reduction are similar to flicker and harmonic reduction (flat bath and foamy slag).
3. Discharge of dyeing material
Due to the inherent characteristics of the continuous charging electric arc furnace process, secondary combustion is carried out in the preheating section, and the flue gas is always in a high-temperature state (800-900 ℃) when leaving the preheating section of the continuous charging electric arc furnace, which is a necessary condition for complete decomposition of dioxin.
Flat bath operation allows a continuous feed electric arc furnace to be subjected to such conditions for the vast majority of tap-to-tap time, which is a significant advantage over other electric arc furnaces with preheating or standard top-loading electric arc furnaces.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. Continuous charging electric arc furnace system, including electric arc furnace, conveyer belt unit, drive unit, closed unit and air current regulation unit, characterized by:
the conveyor belt unit comprises a feeding section conveyor belt, a preheating section conveyor belt and a connecting trolley, the feeding section conveyor belt and the preheating section conveyor belt are hung on a plurality of hanging rods, the hanging rods are hung on a base of the supporting mechanism, the tail end of the feeding section conveyor belt is connected with the head end of the preheating section conveyor belt, the tail end of the preheating section conveyor belt is connected with the head end of the connecting trolley, the tail end of the connecting trolley is connected with the electric arc furnace,
the driving unit comprises a tail end driving device and an intermediate driving device, the tail end driving device is arranged at the head end of the feeding section conveyor belt, the tail end driving device drives the feeding section conveyor belt to vibrate, the intermediate driving device is arranged at the joint of the tail end of the feeding section conveyor belt and the head end of the preheating section conveyor belt, the intermediate driving device drives the preheating section conveyor belt to vibrate,
the closed unit comprises a smoke hood and a water-cooling smoke hood, the smoke hood is arranged on the preheating section conveying belt, the water-cooling smoke hood is arranged on the connecting trolley,
the air flow adjusting unit comprises a dust removing device, a dynamic sealing device and a cold air mixing adjusting system, the dust removing device is arranged on the smoke hood and is close to the head end of the preheating section conveying belt, the dynamic sealing device is arranged above the head end of the preheating section conveying belt, and the cold air mixing adjusting system is arranged on the water-cooling smoke hood.
2. The continuous feed electric arc furnace system as recited in claim 1, wherein: the section of the feeding section conveyor belt and the section of the preheating section conveyor belt are both trapezoidal, and skirt structures are arranged on the upper portion of the feeding section conveyor belt and the upper portion of the preheating section conveyor belt.
3. The continuous feed electric arc furnace system as recited in claim 1, wherein: and the middle driving device and the tail end driving device are vibration exciters.
4. The continuous feed electric arc furnace system as recited in claim 1, wherein: and a baffle plate is arranged at the joint of the water-cooling smoke hood and the inlet of the electric arc furnace, and the baffle plate is fixed in the water-cooling smoke hood.
5. The continuous feed electric arc furnace system as recited in claim 1, wherein: the continuous charging electric arc furnace system further comprises a pressure device, and the pressure device is connected with the electric arc furnace.
6. The continuous feed electric arc furnace system as recited in claim 5, wherein: the pressure device is sequentially divided into three layers from top to bottom, namely a transformer chamber, a high-pressure chamber and a hydraulic chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820431947.1U CN208071737U (en) | 2018-03-29 | 2018-03-29 | Continuous charging arc furnace system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820431947.1U CN208071737U (en) | 2018-03-29 | 2018-03-29 | Continuous charging arc furnace system |
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| Publication Number | Publication Date |
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| CN208071737U true CN208071737U (en) | 2018-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820431947.1U Expired - Fee Related CN208071737U (en) | 2018-03-29 | 2018-03-29 | Continuous charging arc furnace system |
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| CN (1) | CN208071737U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113512623A (en) * | 2021-08-26 | 2021-10-19 | 中冶京诚工程技术有限公司 | Magnetic Scrap Preheating Electric Arc Furnace |
-
2018
- 2018-03-29 CN CN201820431947.1U patent/CN208071737U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113512623A (en) * | 2021-08-26 | 2021-10-19 | 中冶京诚工程技术有限公司 | Magnetic Scrap Preheating Electric Arc Furnace |
| CN113512623B (en) * | 2021-08-26 | 2024-04-16 | 中冶京诚工程技术有限公司 | Magnetic scrap preheating type electric arc furnace |
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Granted publication date: 20181109 |