CN113278761B - Furnace iron adding and returning device for closed electric furnace - Google Patents
Furnace iron adding and returning device for closed electric furnace Download PDFInfo
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- CN113278761B CN113278761B CN202110648312.3A CN202110648312A CN113278761B CN 113278761 B CN113278761 B CN 113278761B CN 202110648312 A CN202110648312 A CN 202110648312A CN 113278761 B CN113278761 B CN 113278761B
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- dustproof
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 99
- 238000007789 sealing Methods 0.000 claims abstract description 122
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 91
- 239000011261 inert gas Substances 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 30
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 9
- 231100001261 hazardous Toxicity 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 239000003034 coal gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 235000000396 iron Nutrition 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention provides a charging and returning iron device for a closed electric furnace, which comprises: the dustproof processing unit is arranged at the upper end of the sealing processing unit, the dustproof processing unit comprises a dustproof mechanism and/or an upper cavity, and the dustproof mechanism is arranged at the feeding end of the upper cavity; the sealing treatment unit comprises a lower cavity, a sealing mechanism and a dangerous gas treatment module, wherein the sealing mechanism is arranged at a feeding end and a discharging end of the lower cavity, and the dangerous gas treatment module is connected with the inside of the lower cavity.
Description
Technical Field
The invention relates to the technical field of ferroalloy smelting equipment, in particular to a charging-back furnace iron device for a closed electric furnace.
Background
When tapping in front of a smelting plant, no matter a ladle, a long-distance chute or a pig casting machine scheme is adopted, residual iron remains at the bottom of the ladle and at the two sides of the pig casting machine in the chute in the flowing, transferring and solidifying process of molten iron, so that the pig casting machine is well known as crude iron. Since these unshaped raw irons contain impurities such as sand, the selling price is low in the market, and many smelter owners strongly require coarse crushing of raw irons to a grain size of 300mm or less as return irons, and melting and re-casting them to form by using the furnace temperature.
In the past, a large number of open furnaces or semi-closed furnaces exist in China, and the mode of tapping rough iron is also furnace return, and the method is that a furnace door of a furnace cover of an electric furnace is opened, a worker adopts tools such as a spade or a shovel to scoop the rough iron into the furnace, and the operation mode belongs to manual proximity electric furnace operation. There are the following problems:
1. the amount of crude iron in one day of the electric furnace is close to 10t, the electric furnace is returned by full manual operation, the operation time is long, and the labor intensity of workers is high;
2. when the electric furnace is closed to operation, once incomplete combustion CO overflows in the electric furnace, hidden danger of explosion exists, and the danger is high;
3. The working layer of workers is generally arranged on the second layer of the electric furnace factory building, namely a furnace cover layer, so that the working dust of the artificial shoveling iron is large, the environment of the second layer is seriously polluted, and the harm to the bodies of the workers is large; meanwhile, dust containing iron has a certain influence on the insulation of all components of the electric furnace body;
4. In order to facilitate operation, a furnace door needs to be opened, the air distribution balance of combustion in the original electric furnace is changed, the heat energy value and the heat distribution in the furnace are influenced, and the subsequent preheating utilization link is influenced;
5. The operation depends on the working condition of an open or semi-closed electric furnace, cannot be applied to a closed furnace, and has limitations and lagging. The sealed electric furnace is in a high-temperature reducing atmosphere, contains 50-80% of CO, belongs to a gas environment, and the gas is led to equipment such as a combustion furnace or a sintering kiln after being purified so as to achieve the aim of recycling. Because the gas exists in the furnace, the mode of directly returning the crude iron after the furnace is opened can lead to great potential safety hazards such as gas leakage poisoning, gas combustion explosion and the like, and simultaneously, the gas component in the furnace is changed to influence the recycling of the gas.
Currently, due to the requirements of environmental protection and industrial policies, the country has not allowed the construction of non-closed electric furnace projects, and in recent years, all non-closed electric furnaces must be changed into closed electric furnaces or shut down.
Therefore, in the airtight form of the electric furnace, a new method for treating the returned iron is needed, the equipment level of the submerged arc furnace is improved, and the iron adding and returning device which is reasonable, good in sealing effect, free of influence on the furnace condition, capable of improving the working environment and reducing the labor intensity of workers is a main subject of airtight electric furnace equipment.
Therefore, a furnace iron adding and returning device for a closed electric furnace needs to be designed.
Disclosure of Invention
According to the technical problem that the existing furnace returning operation relies on the full manual operation of the open furnace to have potential safety hazards of harmful gas leakage or explosion, the furnace iron adding and returning device for the closed electric furnace is provided. The invention mainly utilizes the multi-cavity alternate charging and matching dangerous gas return pipeline, thereby playing a role in solving the potential safety hazard problem in the return process of the return iron.
The invention adopts the following technical means:
A return iron charging device for a closed electric furnace, comprising: the dustproof processing unit is arranged at the upper end of the sealing processing unit, the dustproof processing unit comprises a dustproof mechanism and/or an upper cavity, and the dustproof mechanism is arranged at the feeding end of the upper cavity; the sealing treatment unit comprises a lower cavity, a sealing mechanism and a dangerous gas treatment module, wherein the sealing mechanism is arranged at the feeding end and the discharging end of the lower cavity, and the dangerous gas treatment module is connected with the inside of the lower cavity.
Further, the number of the dustproof processing units is one or more, and when the number of the dustproof processing units is one, the dustproof processing units are directly connected to the upper end of the sealing processing unit; when the number of the dustproof processing units is more than one, a plurality of dustproof processing units are connected in series, and a combined module formed by the dustproof processing units is arranged at the upper end of the sealing processing unit.
Further, the dustproof mechanism is a receiving hopper dustproof mechanism and/or a sealing valve dustproof mechanism, the receiving hopper dustproof mechanism comprises a single receiving hopper structure or a receiving hopper structure with a dustproof plate, and the sealing dustproof mechanism is a sealing valve I.
Further, the single receiving hopper structure is receiving hopper I, take dust guard receiving hopper structure includes receiving hopper II, pivot, connection loop bar, counter weight pole and turns over the board, receiving hopper II sets up go up the feed end of cavity, connection loop bar with turn over between the board fixed connection, connection loop bar with it passes through to turn over the board the pivot sets up receiving hopper II's bottom, the pivot sets up connect the loop bar with the junction of turning over the board, the counter weight pole sets up connect the end of loop bar.
Further, the sealing mechanism comprises a sealing valve II and a sealing valve III, the sealing valve II is arranged at the feeding end of the lower cavity, and the sealing valve III is arranged at the discharging end of the lower cavity.
Further, the dangerous gas treatment module comprises an inert gas blowing pipeline, a dangerous gas detection pipeline and a dangerous gas return pipeline, the gas outlet end of the inert gas blowing pipeline is connected with the inner cavity of the lower cavity, the gas inlet end of the dangerous gas detection pipeline is connected with the inner cavity of the lower cavity, the gas outlet end of the dangerous gas return pipeline is connected with the inner cavity of the lower cavity, and a dangerous gas detection device is arranged on the dangerous gas detection pipeline.
Further, the outer end of the cavity of the dangerous gas detection pipeline is connected with an inert gas blowback pipeline I, and the dangerous gas detection pipeline is connected with the inert gas blowback pipeline I through a blowback pipeline control valve I; the external section of the cavity of the dangerous gas back-flushing pipeline is connected with an inert gas back-flushing pipeline II, the inert gas back-flushing pipeline II and the dangerous gas back-flushing pipeline form a Y-shaped pipeline, and a back-flushing pipeline control valve II is arranged on the inert gas back-flushing pipeline II; an overhaul valve is arranged on the hazardous gas return pipeline; and a main pipeline control valve is arranged on the inert gas pipeline.
Compared with the prior art, the invention has the following advantages:
1. The invention provides a furnace iron adding and returning device for a closed electric furnace, which can further perfect the function of the closed electric furnace on the premise of not influencing the furnace condition and solve the industrial problem.
2. The furnace iron adding and returning device for the closed electric furnace provided by the invention has the advantages that furnace gas is not contacted with the atmosphere in the whole furnace returning process, and the heat energy loss is low; meanwhile, the furnace condition, the concentration/heat value of the gas and the recycling of the gas are not influenced.
3. The furnace iron adding and returning device for the closed electric furnace provided by the invention does not need manual feeding, reduces the labor intensity and the danger of workers and has high automation degree.
For the reasons, the invention can be widely popularized in the technical field of ferroalloy smelting equipment and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram I of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 2 is a schematic view of a dust-proof treatment unit of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 3 is a schematic diagram of a sealing treatment unit of a furnace iron adding and returning device for a closed electric furnace.
FIG. 4 is a schematic diagram showing the change of a return iron medium of a return iron adding device for a closed electric furnace.
FIG. 5 is a schematic diagram II of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 6 is a schematic diagram III of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 7 is a schematic view IV of a furnace iron charging-back device for a closed electric furnace according to the present invention.
FIG. 8 is a schematic view V of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 9 is a schematic view VI of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
FIG. 10 is a schematic view VII of a furnace iron charging and returning device for a closed electric furnace according to the present invention.
In the figure: 1. a dust-proof processing unit; 11. a receiving hopper II; 12. a rotating shaft; 13. connecting a loop bar; 14. a weight bar; 15. turning plate; 16. an upper cavity; 17. sealing the valve I; 18. a receiving hopper I; 2. a seal processing unit; 21. sealing a valve II; 22. sealing a valve III; 23. a lower cavity; 24. an inert gas blowing pipe; 241. a main pipeline control valve; 25. a hazardous gas detection pipeline; 251. a blowback pipeline control valve I; 26. a hazardous gas detection device; 27. an inert gas blowback pipeline II; 271. a blowback pipeline control valve II; 28. a hazardous gas return pipeline; 281. and (5) overhauling the valve.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1 to 10, the present invention provides a charging-back iron apparatus for a closed electric furnace, comprising: the dustproof treatment unit 1 and the sealing treatment unit 2, wherein the dustproof treatment unit 1 is arranged at the upper end of the sealing treatment unit 2, the dustproof treatment unit 1 comprises a dustproof mechanism and/or an upper cavity 16, and the dustproof mechanism is arranged at the feeding end of the upper cavity 16; the sealing treatment unit 2 comprises a lower cavity 23, a sealing mechanism and a dangerous gas treatment module, wherein the sealing mechanism is arranged at a feeding end and a discharging end of the lower cavity 23, and the dangerous gas treatment module is connected with the inside of the lower cavity 23; the number of the dustproof processing units 1 is one or more, and when the number of the dustproof processing units 1 is one, the dustproof processing units 1 are directly connected to the upper end of the sealing processing unit 2; when the number of the dustproof processing units 1 is more than one, a plurality of dustproof processing units 1 are mutually connected in series, and a combined module formed by the dustproof processing units 1 is arranged at the upper end of the sealing processing unit 2; the dustproof mechanism is a receiving hopper dustproof mechanism and/or a sealing valve dustproof mechanism, the receiving hopper dustproof mechanism comprises a single receiving hopper structure or a receiving hopper structure with a dustproof plate, and the sealing dustproof mechanism is a sealing valve I17; the single receiving hopper structure is a receiving hopper I18, the receiving hopper structure with the dust guard comprises a receiving hopper II 11, a rotating shaft 12, a connecting sleeve rod 13, a counterweight rod 14 and a turning plate 15, the receiving hopper II 11 is arranged at the feeding end of the upper cavity 16, the connecting sleeve rod 13 is fixedly connected with the turning plate 15, the connecting sleeve rod 13 and the turning plate 15 are arranged at the bottom of the receiving hopper II 11 through the rotating shaft 12, the rotating shaft 12 is arranged at the joint of the connecting sleeve rod 13 and the turning plate 15, and the counterweight rod 14 is arranged at the tail end of the connecting sleeve rod 13; the sealing mechanism comprises a sealing valve II 21 and a sealing valve III 22, the sealing valve II 21 is arranged at the feeding end of the lower cavity 23, and the sealing valve III 22 is arranged at the discharging end of the lower cavity 23; the dangerous gas treatment module comprises an inert gas blowing-in pipeline 24, a dangerous gas detection pipeline 25 and a dangerous gas return pipeline 28, wherein the gas outlet end of the inert gas blowing-in pipeline 24 is connected with the inner cavity of the lower cavity 23, the gas inlet end of the dangerous gas detection pipeline 25 is connected with the inner cavity of the lower cavity 23, the gas outlet end of the dangerous gas return pipeline 28 is connected with the inner cavity of the lower cavity 23, and a dangerous gas detection device 26 is arranged on the dangerous gas detection pipeline 25; the outer end of the cavity of the dangerous gas detection pipeline 25 is connected with an inert gas blowback pipeline I, and the dangerous gas detection pipeline 25 is connected with the inert gas blowback pipeline I through a blowback pipeline control valve I251; an inert gas blowback pipeline II 27 is connected to the outer section of the dangerous gas blowback pipeline 28, the inert gas blowback pipeline II 27 and the dangerous gas blowback pipeline 28 form a Y-shaped pipeline, and a blowback pipeline control valve II 271 is arranged on the inert gas blowback pipeline II 27; a maintenance valve 281 is arranged on the hazardous gas return pipeline 28; the inert gas line is provided with a main line control valve 241.
Example 1
As shown in fig. 1, the device is located above the furnace cover of the electric furnace and mainly comprises the following 2 parts: dustproof processing unit 1 and sealing processing unit 2 as shown in fig. 2, dustproof processing unit 1 is mainly composed of the following parts: the receiving hopper II 11, the rotating shaft 12, the connecting sleeve rod 13, the counterweight rod 14, the turning plate 15 and the upper cavity 16 are formed into a material receiving space by integrating the receiving hopper II 11 and the upper cavity 16 into a structural whole, and are used for receiving return iron; the connecting sleeve rod 13 and the turning plate 15 are integrated into a whole with a fixed angle structure, the turning plate 15 is positioned at the bottom of the receiving hopper II 11 so that the upper cavity 16 forms a sealing structure, the rotating shafts 12 are distributed at the side of the receiving hopper II 11, and the rotating pairs for connecting the sleeve rod 13 and the turning plate 15 are arranged at the tail end of the connecting sleeve rod 13, so that the turning plate 15 is automatically closed;
As shown in fig. 3, the sealing processing unit 2 is mainly composed of the following parts: the device comprises a sealing valve II 21, a sealing valve III 23, a main pipeline control valve 241, a blowback pipeline control valve I251, a dangerous gas detection device 26, a blowback pipeline control valve II 271, an overhaul valve 281 and a lower cavity 23, wherein the dangerous gas detection device 26 is a dangerous gas detection instrument, the sealing valve II 21 and the sealing valve III 23 are arranged up and down, the middle part of the sealing valve II is the lower cavity 23 to form a closed space together, a plurality of connecting pipes are distributed at the middle upper part of the outer wall of the lower cavity 23, an inert gas blowing pipeline 24, an inert gas blowback pipeline I and a dangerous gas blowback pipeline 28 are connected with the connecting pipes, the main pipeline control valve 241 is arranged on the inert gas blowing pipeline 24, the blowback pipeline I is provided with the blowback pipeline control valve I251, the dangerous gas blowback pipeline 28 is provided with an inert gas blowback pipeline II 27 and an overhaul valve 281, and the inert gas blowback pipeline II is provided with the blowback pipeline control valve II 271;
The device for adding the return iron is arranged above the furnace cover of the closed electric furnace, the return iron is processed according to a certain granularity, the return iron can be fed in batches through the hoisting mode of an electric hoist and a hopper, as shown in figure 2, falls onto a turning plate 15 through the guiding action of a receiving hopper II 11, the turning plate 15 is opened by utilizing gravity to overcome the weight of a counterweight rod 14, the length and the weight of the counterweight rod 14 are adjusted according to the weight of the return iron of each batch, the turning plate 15 is opened by rotating around a rotating shaft 12, the return iron of one batch falls into an upper cavity 16 through the receiving hopper II 11, the turning plate 15 returns to the original position due to the action of the counterweight rod 14, the upper cavity 16 is sealed, the dust after feeding is prevented from overflowing from the receiving hopper II, as shown in figure 3, the return iron falls into a lower cavity 23 after the sealing valve II 21 is opened, and the upper sealing valve II 21 is closed, the furnace returning iron is in a closed space, then the sealing valve III 23 is opened, after the furnace returning iron enters the hearth, the lower cavity 23 is closed, at the moment, a large amount of coal gas is sealed in the lower cavity 23, the dangerous gas detection instrument participates in detection, the dangerous gas exceeds the dangerous concentration, the main pipeline control valve 241 is started, inert gas is filled in the lower cavity, nitrogen is generally adopted, the sealed coal gas in the lower cavity 23 is displaced into the hearth of the electric furnace through a pipeline due to the replacement of the inert gas, thus the coal gas circulates between the lower cavity 23 and the hearth of the electric furnace to prevent potential safety hazards caused by the discharge, when the dangerous gas detection instrument (when the dangerous gas concentration is detected to meet the safety requirement, the main pipeline control valve 241 is closed, the furnace returning iron adding circulation is generally performed for 4-5 circulation a day, the blowback pipeline control valve I251 and the blowback pipeline control valve II 271 on the pipeline are used for instrument and pipeline blockage clearing;
As shown in fig. 4, in the process of changing the medium of the upper cavity and the lower cavity of the charging of the return iron, the upper cavity is the return iron and air, the lower cavity is inert gas, and the electric furnace is gas; in the material sealing process, the upper cavity is air, the lower cavity is return iron and inert gas, and the electric furnace is internally provided with coal gas; in the discharging process, the upper cavity is air, the lower cavity is inert gas, and the electric furnace is internally provided with return iron and coal gas; this process is cyclically accompanied by the addition of return iron.
The counterweight turning plate solves the dust emission in the whole process, the double valves are alternately sealed to realize the addition of furnace iron in a sealed environment and the protection of inert gas so that the gas is circulated back to the furnace and does not overflow, and the equipment is reliable and high in automation degree, so that the device solves the industrial problem that the closed furnace cannot be added with the furnace iron, and simultaneously improves the working environment and the labor intensity of workers.
Example 2
As shown in fig. 5, the dust-proof processing unit 1 is composed of a receiving hopper i 18, and the sealing processing unit 2 is mainly composed of the following parts: the device comprises a sealing valve II 21, a sealing valve III 23, a main pipeline control valve 241, a blowback pipeline control valve I251, a dangerous gas detection device 26, a blowback pipeline control valve II 271, an overhaul valve 281 and a lower cavity 23, wherein the dangerous gas detection device 26 is a dangerous gas detection instrument, the sealing valve II 21 and the sealing valve III 23 are arranged up and down, the middle part of the sealing valve II is the lower cavity 23 to form a closed space together, a plurality of connecting pipes are distributed at the middle upper part of the outer wall of the lower cavity 23, an inert gas blowing pipeline 24, an inert gas blowback pipeline I and a dangerous gas blowback pipeline 28 are connected with the connecting pipes, the main pipeline control valve 241 is arranged on the inert gas blowing pipeline 24, the blowback pipeline I is provided with the blowback pipeline control valve I251, the dangerous gas blowback pipeline 28 is provided with an inert gas blowback pipeline II 27 and an overhaul valve 281, the inert gas blowback pipeline II is provided with the blowback pipeline control valve 271, and a receiving hopper I18 is directly arranged above the sealing valve II 21; during feeding, the return iron is processed according to a certain granularity, the return iron can be directly added into the receiving hopper I18 in a lifting mode of the electric hoist and the hopper, after the return iron enters the receiving hopper I18, the sealing valve II 21 is opened, and after the return iron falls into the lower cavity 23, the upper sealing valve II 21 is closed.
Example 3
As shown in fig. 6, the lower cavity 23 is an inclined dumping pipeline, and the hazardous gas treatment module is arranged at the upper end of the lower cavity, so that the hazardous gas state near the sealing valve ii 21 can be effectively detected, and serious safety accidents caused by the leakage of the hazardous gas can be prevented.
Example 4
As shown in fig. 7, the dustproof processing unit 1 is composed of a receiving hopper I18, an upper cavity 16 and a sealing valve I17, wherein the receiving hopper I18 is arranged at the upper end of the sealing valve I17, and the lower end of the sealing valve I17 is connected with the upper cavity 16;
During feeding, the return iron is processed according to a certain granularity, the return iron can be directly added into the receiving hopper I18 in a lifting mode of an electric hoist and a hopper, after the return iron enters the receiving hopper I18, the sealing valve I17 is opened, so that the return iron enters the upper cavity 16, when the return iron completely enters the upper cavity 16, the sealing valve I17 is closed, then the sealing valve II 21 is opened, and after the return iron falls into the lower cavity 23, the upper sealing valve II 21 is closed.
Example 5
As shown in fig. 8, two groups of dustproof processing units 1 are connected in series, the first group of dustproof processing units 1 consists of a receiving hopper I18 and an upper cavity 16, the second group of dustproof processing units 1 consists of an upper cavity 16 and a sealing valve I17, the first group of dustproof processing units 1 are arranged at the upper end of the second group of dustproof processing units 1, the receiving hopper I18 in the first group of dustproof processing units 1 is arranged at the upper end of the sealing valve I17, and the lower end of the sealing valve I17 is connected with the upper cavity 16; the sealing valve I17 in the second group of dustproof processing units 1 is arranged at the upper end of the upper cavity 16;
During feeding, the return iron is processed according to a certain granularity, the return iron can be directly added into the receiving hopper I18 of the first group of dustproof processing units 1 in a lifting mode of an electric hoist and a hopper, after the return iron enters the receiving hopper I18, the sealing valve I17 of the first group of dustproof processing units 1 is opened, the return iron enters the upper cavity 16 of the first group of dustproof processing units 1, when the return iron completely enters the upper cavity 16, the sealing valve I17 is closed, then the sealing valve I17 of the second group of dustproof processing units 1 is opened, the return iron enters the upper cavity 16 of the second group of dustproof processing units 1, when the return iron completely enters the upper cavity 16, the sealing valve I17 is closed, the sealing valve II 21 is opened, the return iron falls into the lower cavity 23, and then the upper sealing valve II 21 is closed.
Example 6
As shown in fig. 9, two groups of the same dustproof treatment units 1 are connected in series, the dustproof treatment units 1 are composed of a receiving hopper II 11, a rotating shaft 12, a connecting sleeve rod 13, a counterweight rod 14, a turning plate 15 and an upper cavity 16, and the receiving hopper II 11 and the upper cavity 16 are formed into a material receiving space for receiving return iron as a structural integral piece; the connecting sleeve rod 13 and the turning plate 15 are integrated into a whole with a fixed angle structure, the turning plate 15 is positioned at the bottom of the receiving hopper II 11 so that the upper cavity 16 forms a sealing structure, the rotating shafts 12 are distributed at the side of the receiving hopper II 11, and the rotating pairs for connecting the sleeve rod 13 and the turning plate 15 are arranged at the tail end of the connecting sleeve rod 13, so that the turning plate 15 is automatically closed;
When the material is processed according to a certain granularity, the furnace returning iron can be directly added in a lifting mode of an electric hoist and a hopper, falls to the turning plate 15 through the guiding effect of the receiving hopper II 11, overcomes the weight of the counterweight rod 14 by utilizing gravity to open the turning plate 15, finally falls into the lower cavity 16 positioned at the lowest end, the turning plates 15 of the two layers are automatically closed due to the action of the counterweight rod 14, and at the moment, the sealing valve II 21 is opened, and the furnace returning iron falls into the lower cavity 23 and then closes the upper sealing valve II 21.
Example 7
As shown in fig. 10, the dustproof processing unit 1 is composed of an upper cavity 16 and two groups of sealing valves i 17, wherein the upper cavity 16 is a T-shaped pipeline, and the two groups of sealing valves i 17 are respectively arranged at two openings at the upper end of the upper cavity 16;
During feeding, the furnace returning iron is processed according to a certain granularity, the two groups of sealing valves I17 are opened, the furnace returning iron can be directly added into the upper cavity 16 in a manual or tipping trolley mode, after the furnace returning iron is completely added into the upper cavity 16, the two groups of sealing valves I17 are closed, then the sealing valves II 21 are opened, and the furnace returning iron falls into the lower cavity 23 and then the upper sealing valves II 21 are closed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. A return iron charging device for a closed electric furnace, comprising: the dustproof processing unit is arranged at the upper end of the sealing processing unit, the dustproof processing unit comprises a dustproof mechanism and/or an upper cavity, and the dustproof mechanism is arranged at the feeding end of the upper cavity; the sealing treatment unit comprises a lower cavity, a sealing mechanism and a dangerous gas treatment module, wherein the sealing mechanism is arranged at a feeding end and a discharging end of the lower cavity, and the dangerous gas treatment module is connected with the inside of the lower cavity;
The number of the dustproof processing units is one or more, and when the number of the dustproof processing units is one, the dustproof processing units are directly connected to the upper end of the sealing processing unit; when the number of the dustproof processing units is more than one, a plurality of dustproof processing units are connected in series, and a combined module formed by the dustproof processing units is arranged at the upper end of the sealing processing unit;
The dustproof mechanism is a receiving hopper dustproof mechanism and/or a sealing valve dustproof mechanism, the receiving hopper dustproof mechanism comprises a single receiving hopper structure or a receiving hopper structure with a dustproof plate, and the sealing dustproof mechanism is a sealing valve I; the single receiving hopper structure is a receiving hopper I, the receiving hopper structure with the dust guard comprises a receiving hopper II, a rotating shaft, a connecting sleeve rod, a counterweight rod and a turning plate, wherein the receiving hopper II is arranged at the feeding end of the upper cavity, the connecting sleeve rod is fixedly connected with the turning plate, the connecting sleeve rod and the turning plate are arranged at the bottom of the receiving hopper II through the rotating shaft, the rotating shaft is arranged at the joint of the connecting sleeve rod and the turning plate, and the counterweight rod is arranged at the tail end of the connecting sleeve rod;
the lower cavity is an inclined dumping pipeline, and the dangerous gas treatment module is arranged at the upper end of the lower cavity;
The sealing mechanism comprises a sealing valve II and a sealing valve III, the sealing valve II is arranged at the feeding end of the lower cavity, and the sealing valve III is arranged at the discharging end of the lower cavity;
When feeding, after the sealing valve II is opened, the iron to be returned falls into the lower cavity, then the upper sealing valve II is closed, the iron to be returned exists in a closed space, then the sealing valve III is opened, after the iron to be returned enters the hearth, the sealing valve III is closed, at the moment, a large amount of gas is sealed in the lower cavity, a dangerous gas detecting instrument participates in detection, the dangerous gas exceeds dangerous concentration, inert gas is filled in the lower cavity, and the sealed gas in the lower cavity is extruded into the hearth of the electric furnace through a pipeline due to replacement of the inert gas, so that the gas circulates between the lower cavity and the hearth of the electric furnace to prevent potential safety hazards caused by external discharge;
when the number of the dust-proof processing units is two:
The two groups of dustproof processing units are connected in series, the first group of dustproof processing units consists of a receiving hopper I and an upper cavity, the second group of dustproof processing units consists of an upper cavity and a sealing valve I, the first group of dustproof processing units are arranged at the upper ends of the second group of dustproof processing units, the receiving hopper I in the first group of dustproof processing units is arranged at the upper ends of the sealing valve I, and the lower ends of the sealing valves I are connected with the upper cavity; the sealing valve I in the second group of dustproof processing units is arranged at the upper end of the upper cavity; when feeding, the return iron is processed according to a certain granularity, the return iron can be directly added into a receiving hopper I of a first group of dustproof processing units in a hoisting mode of an electric hoist and a hopper, after the return iron enters the receiving hopper I, a sealing valve I of the first group of dustproof processing units is opened to enable the return iron to enter an upper cavity of the first group of dustproof processing units, when the return iron completely enters the upper cavity, the sealing valve I is closed, then a sealing valve I of a second group of dustproof processing units is opened to enable the return iron to enter an upper cavity of the second group of dustproof processing units, when the return iron completely enters the upper cavity, the sealing valve I is closed, and when the return iron completely enters the lower cavity, the sealing valve II is opened to enable the return iron to fall into the lower cavity and then the upper sealing valve II is closed;
Or two groups of the same dustproof processing units are connected in series, the dustproof processing units consist of a receiving hopper II, the rotating shaft, the connecting sleeve rod, the counterweight rod, the turning plate and the upper cavity, and the receiving hopper II and the upper cavity are formed into a material receiving space for receiving return iron as a structural integral piece; the connecting sleeve rod and the turning plate are integrated into a whole with a fixed angle structure, the turning plate is positioned at the bottom of the receiving hopper II, so that the upper cavity forms a sealing structure, the rotating shafts are distributed at the side of the receiving hopper II and are rotating pairs of the connecting sleeve rod and the turning plate, and the counterweight rod is arranged at the tail end of the connecting sleeve rod to realize the function of automatically closing the turning plate; during feeding, the returning iron is processed according to a certain granularity, the returning iron can be directly added in a hoisting mode of an electric hoist and a hopper, falls onto a turning plate under the guiding action of a receiving hopper II, overcomes the weight of a counterweight rod by utilizing gravity to open the turning plate, finally falls into a lower cavity at the lowest end completely, the turning plates at two layers are automatically closed under the action of the counterweight rod, and then a sealing valve II is opened until the returning iron falls into the lower cavity and then is closed;
When the dustproof processing unit consists of the upper cavity and two groups of sealing valves I, the upper cavity is a T-shaped pipeline, and the two groups of sealing valves I are respectively arranged at two openings at the upper end of the upper cavity; during feeding, the furnace returning iron is processed according to a certain granularity, the two groups of sealing valves I are opened, the furnace returning iron can be directly added into the upper cavity in a manual or tipping trolley mode, after the furnace returning iron is completely added into the upper cavity, the two groups of sealing valves I are closed, and then the sealing valve II is opened until the furnace returning iron falls into the lower cavity and then the upper sealing valve II is closed.
2. The iron adding and returning device for the closed electric furnace according to claim 1, wherein the dangerous gas treatment module comprises an inert gas blowing pipeline, a dangerous gas detection pipeline and a dangerous gas returning pipeline, the gas outlet end of the inert gas blowing pipeline is connected with the inner cavity of the lower cavity, the gas inlet end of the dangerous gas detection pipeline is connected with the inner cavity of the lower cavity, the gas outlet end of the dangerous gas returning pipeline is connected with the inner cavity of the lower cavity, and the dangerous gas detection device is arranged on the dangerous gas detection pipeline.
3. The iron adding and returning device for the closed electric furnace according to claim 2, wherein the outer end of the cavity of the dangerous gas detection pipeline is connected with an inert gas blowback pipeline I, and the dangerous gas detection pipeline is connected with the inert gas blowback pipeline I through a blowback pipeline control valve I; the external section of the cavity of the dangerous gas back-flushing pipeline is connected with an inert gas back-flushing pipeline II, the inert gas back-flushing pipeline II and the dangerous gas back-flushing pipeline form a Y-shaped pipeline, and a back-flushing pipeline control valve II is arranged on the inert gas back-flushing pipeline II; an overhaul valve is arranged on the hazardous gas return pipeline; and a main pipeline control valve is arranged on the inert gas pipeline.
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| CN202110648312.3A CN113278761B (en) | 2021-06-10 | 2021-06-10 | Furnace iron adding and returning device for closed electric furnace |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0949009A (en) * | 1995-08-08 | 1997-02-18 | Nkk Corp | Vertical furnace |
| CN204752799U (en) * | 2015-05-26 | 2015-11-11 | 江苏建中新材料科技有限公司 | Reducing atmosphere protection system of normalizing annealing stove |
| CN112456154A (en) * | 2020-12-17 | 2021-03-09 | 江门市崖门新财富环保工业有限公司 | Sealing feeding method for sheet and block materials |
| CN112728944A (en) * | 2021-01-26 | 2021-04-30 | 中冶赛迪工程技术股份有限公司 | Automatic start-stop type electric furnace feeding device |
| CN215250992U (en) * | 2021-06-10 | 2021-12-21 | 大连重工机电设备成套有限公司 | Return iron adding device for closed electric furnace |
-
2021
- 2021-06-10 CN CN202110648312.3A patent/CN113278761B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0949009A (en) * | 1995-08-08 | 1997-02-18 | Nkk Corp | Vertical furnace |
| CN204752799U (en) * | 2015-05-26 | 2015-11-11 | 江苏建中新材料科技有限公司 | Reducing atmosphere protection system of normalizing annealing stove |
| CN112456154A (en) * | 2020-12-17 | 2021-03-09 | 江门市崖门新财富环保工业有限公司 | Sealing feeding method for sheet and block materials |
| CN112728944A (en) * | 2021-01-26 | 2021-04-30 | 中冶赛迪工程技术股份有限公司 | Automatic start-stop type electric furnace feeding device |
| CN215250992U (en) * | 2021-06-10 | 2021-12-21 | 大连重工机电设备成套有限公司 | Return iron adding device for closed electric furnace |
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| CN113278761A (en) | 2021-08-20 |
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