CN112430705A - Full scrap steel smelting method and equipment based on electric arc furnace - Google Patents
Full scrap steel smelting method and equipment based on electric arc furnace Download PDFInfo
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- 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
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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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
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Abstract
The embodiment of the invention provides a full scrap steel smelting method and equipment based on an electric arc furnace. The method comprises the following steps: determining working current according to a power supply model, and determining power supply schemes in different stages according to the wear index of a refractory material in an arcing stage, the arc length of a submerged arc of the foamed slag in a final melting stage and an oxidation heating stage; determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in a final melting period and an oxidation heating period according to the slagging process. The method and the equipment for smelting the full scrap steel based on the electric arc furnace change the manual experience operation mode of the traditional electric furnace smelting process, realize the visualization of the steelmaking process, and can avoid the problems of severe radiation of a furnace lining, overlong smelting period, high electric energy consumption and the like caused by the manual experience operation.
Description
Technical Field
The embodiment of the invention relates to the technical field of electric arc furnace steelmaking, in particular to a full scrap steel smelting method and equipment based on an electric arc furnace.
Background
The short-flow steelmaking process taking electric arc furnace steelmaking as a core has the advantages that the engineering investment, the ton steel resource consumption, the energy consumption, the occupied area, the carbon dioxide emission and other pollutant emissions are greatly reduced compared with the long-flow steelmaking process, and the requirements of scientific development and low-carbon economic development of the steel industry are met. Since the advent of electric furnace steelmaking, there has been a growing trend and the development of electric arc furnace steelmaking is well-established.
Related power supply research is difficult to be really used for guiding smelting power supply of the electric arc furnace, some power supply methods are mainly summarized by manual experience, and the electric arc furnace with specific tonnage is not widely applicable. Other methods mainly use a certain specific type of scrap steel as a raw material, and are not effectively applicable to electric furnace smelting of other raw material structures in process. And other methods can not guide the whole electric furnace smelting process and only play a role in guiding local operation. Therefore, the development of a method and an apparatus for smelting all scrap steel based on an electric arc furnace, which can effectively overcome the above-mentioned drawbacks in the related art, has become a technical problem to be solved in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a full scrap steel smelting method and equipment based on an electric arc furnace.
In a first aspect, an embodiment of the present invention provides a full scrap steel smelting method based on an electric arc furnace, including: determining working current according to a power supply model, and determining power supply schemes in different stages according to the wear index of a refractory material in an arcing stage, the arc length of a submerged arc of the foamed slag in a final melting stage and an oxidation heating stage; determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in a final melting period and an oxidation heating period according to the slagging process.
On the basis of the content of the embodiment of the method, the method for smelting the full scrap steel based on the electric arc furnace provided by the embodiment of the invention comprises the following steps of: the set value of the power consumption of each ton of steel at the end of the main melting period is 200-250kWh/t, and the power consumption of each ton of steel at the end of the melting period and the power consumption of each ton of steel at the end of the oxidation period are determined according to the steelmaking heat balance result of the electric arc furnace.
On the basis of the content of the embodiment of the method, the method for smelting the full scrap steel based on the electric arc furnace provided by the embodiment of the invention comprises the following steps of: and determining the power consumption of each ton of steel at the end of the main melting period according to the power consumption of the scrap steel with the melting proportion of 70-85%.
On the basis of the content of the embodiment of the method, the method for smelting the full scrap steel based on the electric arc furnace provided by the embodiment of the invention comprises the following steps of determining the supply mode of natural gas and oxygen in a burner mode in the main melting period: and (3) blowing natural gas and oxygen by using a burner, wherein the ratio of natural gas to oxygen is 2: 1-3: 1, and the natural gas blowing duration and flow are obtained according to the natural gas demand provided in the material balance and heat balance model.
On the basis of the content of the embodiment of the method, the carbon supply process of the full scrap steel smelting method based on the electric arc furnace provided by the embodiment of the invention comprises the following steps: and obtaining the carbon powder injection amount according to the saturated carbon powder injection amount of the slag in the final melting stage and the oxidation temperature rise stage.
On the basis of the content of the embodiment of the method, the oxygen supply process of the full scrap steel smelting method based on the electric arc furnace provided by the embodiment of the invention comprises the following steps: and determining oxygen supply quantity according to the components of the foamed slag and the expected oxygen demand quantity, wherein the oxygen supply quantity is changed along with the smelting stage.
Based on the content of the above method embodiments, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiments of the present invention includes: the ratio of oxygen supply amount in the main melting period to the natural gas is 2:1 to 3: 1; the oxygen supply amount at the final melting stage is the oxygen amount required by the main melting stage minus the oxygen amount consumed in the burner mode of the main melting stage; and the oxygen supply amount in the oxidation period is calculated according to a material balance and heat balance model.
In a second aspect, an embodiment of the present invention provides an electric arc furnace-based all-scrap steel smelting device, including: the power supply scheme module is used for determining working current according to the power supply model and determining power supply schemes in different stages according to the wear index of the refractory material in the arcing stage, the arc length of the submerged arc of the foam slag in the final melting stage and the oxidation heating stage; the gas supply mode module is used for determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and the process module is used for determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in the final melting stage and the oxidation heating stage according to the slagging process.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the electric arc furnace-based all-scrap steel smelting method provided by any one of the various implementation manners of the first aspect.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium storing computer instructions for causing a computer to perform an electric arc furnace-based all-scrap steel smelting process as provided in any one of the various implementations of the first aspect.
According to the method and the equipment for smelting the full scrap steel based on the electric arc furnace, provided by the embodiment of the invention, through determining the working current, the power supply scheme, the power supply duration, the supply mode of natural gas and oxygen and the carbon supply process and the oxygen supply process, the manual experience operation mode of the traditional electric furnace smelting process is changed, the visualization of the steelmaking process is realized, the whole course guidance on the process flow of the full scrap steel smelting is facilitated, and the problems of severe radiation of a furnace lining, overlong smelting period, high electric energy consumption and the like caused by depending on manual experience operation can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for smelting all scrap steel based on an electric arc furnace according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an energy input control flow of the full scrap steel smelting in the electric arc furnace according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electric arc furnace-based all-scrap steel smelting device provided by the embodiment of the invention;
fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution, and such combination is not limited by the sequence of steps and/or the structural composition mode, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, such a technical solution combination should not be considered to exist and is not within the protection scope of the present invention.
The problems of poor economy, large refractory material loss, high power consumption of each ton of steel and the like caused by unreasonable smelting method due to manual experience are solved. The reasonable smelting method and power supply system are favorable for improving smelting efficiency, saving energy and reducing consumption, and play a certain role in protecting the furnace lining of the electric arc furnace. The electric furnace smelting mainly comprises power supply, carbon supply, oxygen supply, natural gas supply, slagging and the like, and a reasonable power supply, carbon supply, oxygen supply, natural gas supply and slagging operation need to be provided. Based on the thought, the embodiment of the invention provides a full scrap steel smelting method based on an electric arc furnace, and the method comprises the following steps: determining working current according to a power supply model, and determining power supply schemes in different stages according to the wear index of a refractory material in an arcing stage, the arc length of a submerged arc of the foamed slag in a final melting stage and an oxidation heating stage; determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in a final melting period and an oxidation heating period according to the slagging process.
It should be noted that the optimization goal of the power supply model is to minimize the product of the steel making time and the power consumption per ton of steel as the optimization goal. The electric arc furnace smelting can be divided into 4 stages: the arc striking period, the main melting period, the final melting period and the oxidation period, and the specific electric arc furnace steelmaking process system is operated according to the 4 stages.
Based on the content of the above method embodiment, as an optional embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention, wherein the determining of the power supply schemes at different stages includes: the set value of the power consumption of each ton of steel at the end of the main melting period is 200-250kWh/t, and the power consumption of each ton of steel at the end of the melting period and the power consumption of each ton of steel at the end of the oxidation period are determined according to the steelmaking heat balance result of the electric arc furnace.
Based on the content of the above method embodiment, as an optional embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention, wherein the determining of the power supply schemes at different stages includes: and determining the power consumption of each ton of steel at the end of the main melting period according to the power consumption of the scrap steel with the melting proportion of 70-85%. Specifically, for the condition that the raw material contains more impurities and the power consumption is obviously increased (such as the raw material contains sponge iron, direct reduced iron and the like), the power consumption set value of each ton of steel at the end of the main melting period can be determined by the power consumption consumed when the melting proportion of the scrap steel is between 70% and 85%. The scrap melting proportion may be specifically 75%, 80% or 83%.
Based on the content of the above method embodiment, as an optional embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention, wherein the determining of the supply modes of natural gas and oxygen in the burner mode in the main melting period includes: and (3) blowing natural gas and oxygen by using a burner, wherein the ratio of natural gas to oxygen is 2: 1-3: 1, and the natural gas blowing duration and flow are obtained according to the natural gas demand provided in the material balance and heat balance model.
Based on the content of the above method embodiment, as an optional embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention includes: and obtaining the carbon powder injection amount according to the saturated carbon powder injection amount of the slag in the final melting stage and the oxidation temperature rise stage. The blowing amount of the carbon powder can be 8 to 15 g/(min)-1kg·slag-1)。
Based on the content of the above method embodiment, as an optional embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention includes: and determining oxygen supply quantity according to the components of the foamed slag and the expected oxygen demand quantity, wherein the oxygen supply quantity is changed along with the smelting stage.
Based on the content of the above method embodiment, as an alternative embodiment, the method for smelting full scrap steel based on an electric arc furnace provided in the embodiment of the present invention, where the oxygen supply amount varies with smelting stages, includes: the ratio of oxygen supply amount in the main melting period to the natural gas is 2:1 to 3: 1; the oxygen supply amount at the final melting stage is the oxygen amount required by the main melting stage minus the oxygen amount consumed in the burner mode of the main melting stage; and the oxygen supply amount in the oxidation period is calculated according to a material balance and heat balance model. Wherein, the required oxygen amount of the main melting period is calculated according to a material balance model and a heat balance model.
According to the full scrap steel smelting method based on the electric arc furnace, provided by the embodiment of the invention, through the determination of the working current, the power supply scheme, the power supply duration, the supply mode of natural gas and oxygen and the carbon supply process and the oxygen supply process, the manual experience operation mode of the traditional electric furnace smelting process is changed, the visualization of the steel-making process is realized, the full-process guidance of the full scrap steel smelting process flow is facilitated, and the problems of severe radiation of a furnace lining, overlong smelting period, high electric energy consumption and the like caused by the manual experience operation can be avoided.
The energy input control flow of the full scrap smelting of the electric arc furnace can be seen in fig. 2. Inputting raw material components and raw material structures into a material balance and heat balance model; inputting transformer parameters, reactor parameters and short network parameters into a power supply model; the power supply model obtains power factors, power consumption, smelting period and rated current, the optimal current is determined according to the power factors, the power consumption, the smelting period and the rated current, the voltage, the reactance gear and the current are obtained according to the arc length of the electric arc furnace, the abrasion coefficient of refractory materials and the power consumption in different stages, the power factors and the electric efficiency are obtained on the basis of the secondary and combining the power supply duration, the power factors and the electric efficiency are input into the material balance and heat balance model, the power consumption in different stages can be obtained, and finally the carbon supply process, the oxygen supply process, the natural gas supply amount and the slag making amount are obtained.
According to the full scrap steel smelting method based on the electric arc furnace, the starting and stopping time of power supply, the carbon powder consumption, the oxygen consumption and the slag charge quantity of each stage are obtained through closed-loop operation between a material balance and heat balance model and a power supply control model. The consistency of a power supply system with carbon supply, oxygen supply, gas supply, slagging and the like is ensured, the visualization of the steelmaking process flow of the electric arc furnace can be realized, and the problems of violent radiation of electric arcs to a furnace lining, overlong smelting period, high electric energy consumption and the like caused by manual experience operation are reduced.
The method for smelting full scrap steel based on an electric arc furnace provided by the embodiment of the invention is described in detail by referring to two application examples, which are merely illustrative of the practical application of the technical scheme of the invention, and the method for smelting full scrap steel based on an electric arc furnace provided by the embodiment of the invention is proved to have practicability and is not taken as a limitation on the protection scope of the patent.
Example 1
The electric furnace is smelted by adopting all scrap steel in a 120t electric furnace of a steel mill, is provided with a 90MVA transformer, and compared with power supply schemes before and after optimization, the smelting period of the electric furnace is reduced by 3.4min after a new power supply system is adopted, the power consumption per ton of steel is reduced by 18kWh, the power factor and the electric efficiency are improved, and the utilization rate of the transformer is obviously improved.
TABLE 1 comparison of economic indicators
| Item | Raw material structure | Period of smelting | Electricity consumption | Power factor | Electric efficiency | Amount of tapping |
| Before optimization | All scrap steel | 59.8 | 406 | 0.79 | 0.92 | 90.5 |
| After optimization | All scrap steel | 56.4 | 388 | 0.82 | 0.93 | 90.2 |
Example 2
The smelting process is carried out by adopting a scrap steel-direct reduced iron raw material structure in a 100t electric furnace of a steel plant, the electric furnace is provided with an 80MVA transformer, and compared with power supply schemes before and after optimization, the smelting period of the electric furnace is reduced by 5.5min, the power consumption per ton of steel is reduced by 26.4kWh after a new power supply system is adopted, the power factor and the electric efficiency are improved, and the utilization rate of the transformer is obviously improved.
TABLE 2 optimized dosing protocol and cost analysis
| Item | Raw material structure | Period of smelting | Electricity consumption | Power factor | Electric efficiency | Amount of tapping |
| Before optimization | 70% scrap-30% DRI | 66.3 | 466.6 | 0.78 | 0.92 | 80.6 |
| After optimization | 70% scrap-30% DRI | 60.8 | 440.2 | 0.82 | 0.93 | 80.5 |
The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on the actual situation, on the basis of the above embodiments, the embodiment of the invention provides an electric arc furnace-based all-scrap steel smelting device, which is used for executing the electric arc furnace-based all-scrap steel smelting method in the above method embodiment. Referring to fig. 3, the apparatus includes: the power supply scheme module is used for determining working current according to the power supply model and determining power supply schemes in different stages according to the wear index of the refractory material in the arcing stage, the arc length of the submerged arc of the foam slag in the final melting stage and the oxidation heating stage; the gas supply mode module is used for determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and the process module is used for determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in the final melting stage and the oxidation heating stage according to the slagging process.
The all-scrap-steel smelting device based on the electric arc furnace provided by the embodiment of the invention adopts various modules in the figure 3, changes the manual experience operation mode of the traditional electric furnace smelting process by determining the working current, the power supply scheme, the power supply duration, the supply mode of natural gas and oxygen and the carbon supply process and the oxygen supply process, realizes the visualization of the steel-making process, is beneficial to performing the whole-process guidance on the process flow of all-scrap-steel smelting, and can avoid the problems of severe radiation of a furnace lining, overlong smelting period, high electric energy consumption and the like caused by depending on manual experience operation.
It should be noted that, the apparatus in the apparatus embodiment provided by the present invention may be used for implementing methods in other method embodiments provided by the present invention, except that corresponding function modules are provided, and the principle of the apparatus embodiment provided by the present invention is basically the same as that of the apparatus embodiment provided by the present invention, so long as a person skilled in the art obtains corresponding technical means by combining technical features on the basis of the apparatus embodiment described above, and obtains a technical solution formed by these technical means, on the premise of ensuring that the technical solution has practicability, the apparatus in the apparatus embodiment described above may be modified, so as to obtain a corresponding apparatus class embodiment, which is used for implementing methods in other method class embodiments. For example:
based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: and the second module is used for determining the power consumption of each ton of steel at the end of the melting period and the power consumption of each ton of steel at the end of the oxidation period according to the steelmaking heat balance result of the electric arc furnace, wherein the set value of the power consumption of each ton of steel at the end of the main melting period is 200-250 kWh/t.
Based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: and the third module is used for determining the power consumption of each ton of steel at the end of the main melting period according to the power consumption of the scrap steel with the melting proportion of 70-85%.
Based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: and the fourth module is used for injecting natural gas and oxygen by adopting the burner, the ratio of the natural gas to the oxygen is 2:1 to 3:1, and the time length and the flow rate of the injected natural gas are obtained according to the natural gas demand provided in the material balance and heat balance model.
Based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: and the fifth module is used for obtaining the carbon powder injection amount according to the saturated carbon powder injection amount of the slag in the final melting stage and the oxidation temperature rising stage.
Based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: and the sixth module is used for determining oxygen supply amount according to the components of the foamed slag and the expected oxygen demand amount, and the oxygen supply amount changes along with the smelting stage.
Based on the content of the embodiment of the device, as an optional embodiment, the full scrap steel smelting device based on the electric arc furnace provided in the embodiment of the invention further comprises: a seventh module, which is used for controlling the ratio of the oxygen supply amount in the main melting period to the natural gas to be 2: 1-3: 1; the oxygen supply amount at the final melting stage is the oxygen amount required by the main melting stage minus the oxygen amount consumed in the burner mode of the main melting stage; and the oxygen supply amount in the oxidation period is calculated according to a material balance and heat balance model.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 4, including: at least one processor (processor)401, a communication Interface (Communications Interface)404, at least one memory (memory)402 and a communication bus 403, wherein the at least one processor 401, the communication Interface 404 and the at least one memory 402 are configured to communicate with each other via the communication bus 403. The at least one processor 401 may invoke logic instructions in the at least one memory 402 to perform all or a portion of the steps of the methods provided by the various method embodiments described previously.
Furthermore, the logic instructions in the at least one memory 402 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Based on this recognition, each block in the flowchart or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In this patent, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A full scrap steel smelting method based on an electric arc furnace is characterized by comprising the following steps: determining working current according to a power supply model, and determining power supply schemes in different stages according to the wear index of a refractory material in an arcing stage, the arc length of a submerged arc of the foamed slag in a final melting stage and an oxidation heating stage; determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in a final melting period and an oxidation heating period according to the slagging process.
2. The electric arc furnace-based all scrap steel making process according to claim 1, wherein said determining the power supply scheme for the different phases comprises: the set value of the power consumption of each ton of steel at the end of the main melting period is 200-250kWh/t, and the power consumption of each ton of steel at the end of the melting period and the power consumption of each ton of steel at the end of the oxidation period are determined according to the steelmaking heat balance result of the electric arc furnace.
3. The electric arc furnace-based all scrap steel making process according to claim 1, wherein said determining the power supply scheme for the different phases comprises: and determining the power consumption of each ton of steel at the end of the main melting period according to the power consumption of the scrap steel with the melting proportion of 70-85%.
4. The electric arc furnace-based all-scrap steel smelting method according to claim 1, wherein the determining of the supply of natural gas and oxygen in the main melting period burner mode comprises: and (3) blowing natural gas and oxygen by using a burner, wherein the ratio of natural gas to oxygen is 2: 1-3: 1, and the natural gas blowing duration and flow are obtained according to the natural gas demand provided in the material balance and heat balance model.
5. The electric arc furnace-based full scrap steel making process according to claim 1, wherein the carbon supply process comprises: and obtaining the carbon powder injection amount according to the saturated carbon powder injection amount of the slag in the final melting stage and the oxidation temperature rise stage.
6. The electric arc furnace-based full scrap steel making process according to claim 1, wherein the oxygen supply process comprises: and determining oxygen supply quantity according to the components of the foamed slag and the expected oxygen demand quantity, wherein the oxygen supply quantity is changed along with the smelting stage.
7. The electric arc furnace-based full scrap steel making process according to claim 1, wherein the oxygen supply is varied from one smelting stage to another, including: the ratio of oxygen supply amount in the main melting period to the natural gas is 2:1 to 3: 1; the oxygen supply amount at the final melting stage is the oxygen amount required by the main melting stage minus the oxygen amount consumed in the burner mode of the main melting stage; and the oxygen supply amount in the oxidation period is calculated according to a material balance and heat balance model.
8. The utility model provides a device is smelted to full steel scrap based on electric arc furnace which characterized in that includes: the power supply scheme module is used for determining working current according to the power supply model and determining power supply schemes in different stages according to the wear index of the refractory material in the arcing stage, the arc length of the submerged arc of the foam slag in the final melting stage and the oxidation heating stage; the gas supply mode module is used for determining the power supply duration of each stage according to the heat balance model and the power supply model, and determining the supply mode of natural gas and oxygen in the burner mode of the main melting period according to the power supply duration of each stage; and the process module is used for determining a slagging process according to the components of the foamed slag, and determining a carbon supply process and an oxygen supply process in the final melting stage and the oxidation heating stage according to the slagging process.
9. An electronic device, comprising:
at least one processor, at least one memory, and a communication interface; wherein the content of the first and second substances,
the processor, the memory and the communication interface are communicated with each other;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 7.
10. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 7.
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| CN114438284A (en) * | 2022-01-05 | 2022-05-06 | 中冶南方工程技术有限公司 | Electric furnace smelting method for hot charging direct reduced iron |
| CN114540574A (en) * | 2022-01-05 | 2022-05-27 | 中冶南方工程技术有限公司 | Electric furnace smelting method for cold charging direct reduced iron |
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