CN111621615A - Device and method for shortening electric furnace steelmaking smelting period - Google Patents

Device and method for shortening electric furnace steelmaking smelting period Download PDF

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Publication number
CN111621615A
CN111621615A CN202010523429.4A CN202010523429A CN111621615A CN 111621615 A CN111621615 A CN 111621615A CN 202010523429 A CN202010523429 A CN 202010523429A CN 111621615 A CN111621615 A CN 111621615A
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oxygen
electric furnace
station
pressure
argon
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Inventor
吴绍刚
荀凤超
王继州
黄敏
武脡鹰
李伟
张乐双
刘洋
潘静
李卫刚
赵运廷
路杰
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Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
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Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
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Priority to CN202010523429.4A priority Critical patent/CN111621615A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/011—Oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention provides a device and a method for shortening an electric furnace steelmaking smelting period. The device for shortening the smelting period of electric furnace steel making comprises: the system comprises an oxygen generation system, a compression system, a storage system, an oxygen station valve chamber and an electric furnace valve station; the electric furnace valve station is communicated with the electric furnace. The method for shortening the smelting period of electric furnace steelmaking comprises the following steps: the oxygen generation system produces oxygen and then conveys the oxygen to the compression system to compress the oxygen; inputting the oxygen processed by the compression system into a storage system for storage, and then regulating the oxygen pressure from the storage system once through an oxygen station valve chamber; and then the pressure is secondarily regulated through an electric furnace valve station, and then the electric furnace is fed for use. The device and the method provided by the application can shorten the steelmaking smelting period of the large-scale electric furnace.

Description

Device and method for shortening electric furnace steelmaking smelting period
Technical Field
The invention relates to the field of steel smelting, in particular to a device and a method for shortening an electric furnace steelmaking smelting period.
Background
The energy for modern electric furnace steel making consists of electric energy, chemical heat and physical heat, wherein the electric energy accounts for 34 percent, the chemical heat accounts for 40 percent and the physical heat accounts for 26 percent. The energy of the traditional electric furnace steel making is mainly electric energy, the smelting period is shortened, the rated power of a transformer is mainly increased, and high voltage is adopted for power supply. The core technology of electric furnace steelmaking is to shorten the smelting period to enable the smelting period to be matched and operated with a high-efficiency continuous casting machine and a continuous rolling machine. Particularly, the problem of controlling the smelting period of the electric furnace is solved because only when the smelting period is shortened to a critical value, the intermittent steel-making operation with high speed and fast pace can be coordinated with the continuous casting-steel rolling operation to form a stable steel manufacturing production flow, so that the electric furnace steel-making becomes a novel large-scale steel production method mainly aiming at recycling of steel scrap resources.
Therefore, how to shorten the smelting period of large-scale electric furnace steelmaking becomes a problem to be solved urgently in electric furnace steelmaking.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to provide a device and a method for shortening the smelting period of electric furnace steelmaking so as to solve the problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a device for shortening the smelting period of electric furnace steelmaking comprises an oxygen making system, a compression system, a storage system, an oxygen station valve chamber and an electric furnace valve station;
the oxygen generation system is used for producing oxygen, the compression system is used for compressing the oxygen from the oxygen generation system, the storage system is used for storing the oxygen from the compression system, the oxygen station valve chamber is used for regulating the pressure of the oxygen from the storage system for the first time, and the electric furnace valve station is used for regulating the pressure of the oxygen after the oxygen is regulated for the second time through the oxygen station valve chamber;
the electric furnace valve station is communicated with the electric furnace
Preferably, the oxygen generation system comprises an air separation oxygen generation system, and is also used for producing nitrogen and liquid argon;
preferably, the gas production rate of the oxygen generation system is 18000-20000m3/h。
The air separation oxygen generation has the advantages that: can produce high-purity oxygen, nitrogen, argon and liquid oxygen, liquid nitrogen and liquid argon products, can operate safely and stably for a long time, and has low failure rate. The purity of oxygen required by electric furnace steelmaking is more than or equal to 98 percent, and no special requirement is made on the balance of 2 percent.
Preferably, the compression system comprises an oxygen compressor, a nitrogen compressor and a liquid argon pump; the oxygen compressor is used for compressing the oxygen that comes from empty system oxygen system that divides of dividing, the nitrogen compressor is used for compressing and comes from empty nitrogen gas that divides system oxygen system divides, liquid argon pump is used for the vaporization to come from empty liquid argon that divides system oxygen system divides.
Preferably, the storage system comprises an oxygen tank, a nitrogen tank, and an argon tank, all in communication with the compression system.
Preferably, the device further comprises an LF furnace-ladle-continuous casting machine valve station, wherein the LF furnace-ladle-continuous casting machine valve station is used for secondarily regulating the pressure of the argon gas subjected to primary regulation through the oxygen station valve chamber.
Preferably, the electric furnace is provided with a plurality of oxygen lances which are in communication with the electric furnace valve station.
A method for shortening an electric furnace steelmaking smelting period comprises the following steps:
the oxygen generation system produces oxygen and then conveys the oxygen to the compression system to compress the oxygen;
inputting the oxygen processed by the compression system into a storage system for storage, and then regulating the oxygen pressure from the storage system once through an oxygen station valve chamber;
and then the pressure is secondarily regulated through an electric furnace valve station, and then the electric furnace is fed for use.
Preferably, the method further comprises:
conveying nitrogen produced by the oxygen production system to a compression system for compression, conveying liquid argon to the compression system for vaporization, and then inputting the liquid argon to a storage system for storage;
and the pressure of the nitrogen and argon from the storage system is adjusted through an oxygen station valve chamber for the first time, then the nitrogen is sent to carbon powder injection, purging and instrument user points for use, and the argon is used after the pressure is adjusted through an LF furnace-ladle-continuous casting machine valve station for the second time.
Preferably, after the primary adjustment through a valve chamber of an oxygen station, the oxygen pressure is 1.4-1.6MPa, the nitrogen pressure is 0.4-0.6MPa, and the argon pressure is 1.4-1.6 MPa;
preferably, after the secondary adjustment of the valve station of the LF furnace-ladle-continuous casting machine, the pressure of argon is 0.8-1.2 MPa;
preferably, the oxygen pressure is 0.8-1.4MPa after the secondary adjustment through the electric furnace valve station.
Preferably, the oxygen consumption per ton steel of the electric furnace is 55-65m3/t。
Compared with the prior art, the invention has the beneficial effects that:
the device and the method for shortening the smelting period of the electric furnace steel making increase the chemical heat of the electric furnace through the matching of the oxygen generation system, the compression system, the storage system, the oxygen station valve chamber and the electric furnace valve station, effectively shorten the smelting period of the large electric furnace by more than 5 minutes, improve the efficiency and the production and reduce the production cost.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
FIG. 1 is a schematic view of an apparatus for shortening a smelting period in electric steelmaking provided in example 1.
Detailed Description
The terms as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be construed to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.
"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).
Embodiments of the present invention will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
As shown in fig. 1, an apparatus for shortening a smelting period in electric steelmaking includes: the system comprises an oxygen generation system, a compression system, a storage system, an oxygen station valve chamber and an electric furnace valve station; the oxygen generation system is used for producing oxygen, the compression system is used for compressing the oxygen from the oxygen generation system, the storage system is used for storing the oxygen from the compression system, the oxygen station valve chamber is used for regulating the pressure of the oxygen from the storage system for the first time, and the electric furnace valve station is used for regulating the pressure of the oxygen subjected to the first regulation through the oxygen station valve chamber for the second time; the electric furnace valve station is communicated with the electric furnace.
When in use, the oxygen generation system produces oxygen and then conveys the oxygen to the compression system to compress the oxygen; inputting the oxygen processed by the compression system into a storage system for storage, and then regulating the oxygen pressure from the storage system once through an oxygen station valve chamber; and then the pressure is secondarily regulated through an electric furnace valve station, and then the electric furnace is fed for use.
Example 2
In order to improve the comprehensive utilization efficiency of the system, the integration level of equipment is increased, and the production cost is further reduced. The embodiment of the application also provides a device for shortening the smelting period of electric furnace steelmaking, which comprises: the system comprises an oxygen generation system, a compression system, a storage system, an oxygen station valve chamber and an electric furnace valve station; the system oxygen system is including empty system oxygen system that divides for production oxygen, nitrogen gas and liquid argon, compression system includes oxygen compressor, nitrogen compressor and liquid argon pump, and oxygen compressor is used for the compression to come from the empty oxygen system that divides, and nitrogen compressor is used for the compression to come from the empty nitrogen gas that divides system oxygen system, and the liquid argon pump is used for the vaporization to come from the empty liquid argon that divides system oxygen system that divides. The storage system comprises an oxygen tank, a nitrogen tank and an argon tank which are communicated with the compression system and are used for storing oxygen, nitrogen and argon from the compression system, the oxygen station valve chamber is used for regulating the pressure of the oxygen, the nitrogen and the argon from the storage system for the first time, and the electric furnace valve chamber is used for regulating the pressure of the oxygen subjected to the first regulation through the oxygen station valve chamber for the second time; the electric furnace valve station is communicated with the electric furnace.
When the device is used, the oxygen generation system produces oxygen, nitrogen and liquid argon, then the oxygen and the nitrogen are conveyed to the compression system for compression, and the liquid argon is conveyed to the compression system for vaporization and then is input into the storage system for storage; the pressure of oxygen, nitrogen and argon from a storage system is adjusted once through an oxygen station valve chamber; then the oxygen is subjected to secondary pressure regulation through an electric furnace valve station and is sent into an electric furnace for use; and (3) sending the nitrogen to carbon powder injection, blowing and instrument user points for use, and using the argon after secondary pressure regulation through an LF furnace-ladle-continuous casting machine valve station.
In a preferred embodiment, in order to ensure that the gas consumption of the large-scale electric furnace reaches the expected target value, the gas production of the oxygen generation system needs to reach 18000-3H, may be, for example, 18000m3/h、19000m3/h、20000m3H and 18000-3Any value between/h.
The nitrogen with the pressure of about 0.4-0.6MPa coming from the valve chamber of the oxygen station is directly used for carbon powder injection, blowing and instrument user points.
In another preferred embodiment, the system further comprises an LF furnace-ladle-continuous casting machine valve station, wherein the LF furnace-ladle-continuous casting machine valve station is used for secondarily regulating the pressure of the argon gas after the primary regulation through the oxygen station valve chamber. For example, after secondary adjustment of the valve station of the LF furnace-ladle-continuous casting machine, the pressure of argon is 0.8-1.4 MPa.
For example, a carbon powder injection system of a 220t electric furnace is an important component of an external heat source, and nitrogen gas is required to be used as a carrier when carbon powder is injected, and the nitrogen gas with the pressure of about 0.6MPa is required to be provided. 2X220tLF furnace (ladle refining furnace), ladle on-line argon blowing, as the refining argon blowing, the argon gas with the pressure of about 0.8-1.2MPa needs to be provided. The continuous casting machine needs about 0.8-1.4MPa of oxygen for cutting the steel billet. The continuous casting machine blows argon to protect casting, and argon with the pressure of about 0.8-1.2MPa needs to be provided. Auxiliary oxygen is used for maintenance, and oxygen with the pressure of about 0.8-1.4MPa needs to be provided. And setting an oxygen user point valve box at each oxygen point user, and adjusting according to the use pressure of the user. Purging, nitrogen for instruments, and providing nitrogen with the pressure of about 0.4-0.6 MPa.
The supply of a large amount of oxygen nitrogen argon ensures that the modern large-scale electric furnace steel-making workshop can produce high-quality low-alloy steel and microalloyed steel with high efficiency, energy conservation, environmental protection and resource conservation.
In other embodiments, an air separation oxygen generation system and a pressure swing adsorption oxygen generation system may be used in combination. For example, in order to ensure the long-term safe and stable production of the steel-making workshop, if one electric furnace is built in the steel-making workshop, one air separation oxygen generation device is matched, and if two electric furnaces are built in the steel-making workshop, one air separation oxygen generation device is matched, and then one pressure swing adsorption oxygen generation device is matched, which are mutually spare and make up for the deficiencies.
Example 3
On the basis of example 2, the oxygen consumption per ton of steel of the electric furnace is controlled to be 55-65m3T is calculated. For example, 4 oxygen lances provided in the side wall of a 220t electric furnace were used to blow the oxygen into the electric furnace. Oxygen supply characteristics of the electric furnace valve station: each oxygen lance is provided with two sets of oxygen regulating systems, the main regulating system supplies oxygen of about 0.8-1.4MPa for oxygen blowing of the furnace, and the flow of one oxygen lance is as follows: 400 to 4000m3H is used as the reference value. The auxiliary adjusting system supplies oxygen of about 0.8-1.4MPa to pass through the oxygen lance circular seam, so that the jet flow length of oxygen blowing is ensured, the oxygen is better sprayed into molten steel, and the oxygen blowing effect is better. The pressure and the flow of each oxygen lance can be independently adjusted, the oxygen lances are flexible in oxygen blowing, and one oxygen lance can be used for independently blowing oxygen, two oxygen lances and three oxygen lances can be used for blowing oxygen, and four oxygen lances can be used for blowing oxygen together.
It should be noted that, the device for shortening the smelting period of the electric furnace steelmaking provided by the present application may also be configured with other equipment according to actual needs, for example, as shown in table 1 below:
TABLE 1 Equipment Table
Figure BDA0002532852840000071
Figure BDA0002532852840000081
Comparative example 1
The comparison was made with a 1X220t electric furnace (whole scrap steel) of the heavy industry Co., Ltd, Jiangsu, Oriental China.
Smelting period: 53min
Oxygen blowing time: 45 minutes
Oxygen consumption per ton of steel: 42-53m3/t
Average flow of oxygen blowing: 10400m3/h
Oxygen blowing maximum flow: 16800m3/h。
Large amount of oxygen is injected in large-scale electric furnace steelmaking, and energy can be savedCan shorten the smelting period. Preparation of 1m3The oxygen consumes 0.4-0.6 KW.h but 1m3Reaction of oxygen with carbon to form CO2The discharged chemical heat can save more than 7 KW.h. Assuming a 1X220t electric furnace, 170 ten thousand tons per year, the analysis can be made from the following aspects:
1. analysis from an oxygen blowing perspective:
oxygen consumption per ton of steel: 55-65m3/t
Oxygen blowing amount: 170*104*55＝9.35*107m3
170*104*65＝1.105*108m3
And (3) electric energy saving: 9.35*107*7＝6.545*108KW·h
1.105*108*7＝7.735*108KW·h
The electricity per degree is calculated according to 0.6 yuan, so that the fund is saved:
6.545*108*0.6＝3.927*108yuan
7.735*108*0.6＝4.641*108Yuan
2. Analysis from the smelting cycle:
1X220t electric furnace smelting period: 53min
Number of smelting furnaces per day: 27 furnace
The smelting period is shortened by 5 minutes: 48min
Number of smelting furnaces per day: 30 furnace
Tapping more steel every day: 660 ton 3 x220
Profit per ton of low-alloy high-strength steel: 600 yuan/ton
Profit for one year: 660 × 600 × 300 ═ 1.88 × 108Yuan
Compared with the prior art, the device and the method provided by the application can greatly reduce energy consumption and improve yield and profit.
The basic tasks of steel making are as follows: oxygen is supplied to the molten pool, and carbon in the furnace burden is oxidized to a specified range; slagging to remove sulfur, phosphorus and oxygen in the raw materials and gas such as hydrogen, nitrogen and nonmetallic inclusions in steel so as to ensure the quality of the steel; the alloy components are adjusted to meet the tapping temperature requirement. Can be summarized as four times of degassing (carbon, oxygen, sulfur and phosphorus), two times of degassing (degassing and impurity removing) and two times of regulating (components and temperature). The main means adopted is oxygen supply, slag formation, temperature rise, addition of a deoxidizer and alloying operation. The carbon-oxygen reaction has the following functions:
1. the carbon-oxygen reaction can ensure that a molten pool is strongly boiled, the mass transfer speed is accelerated, and the contact between slag and steel is increased;
2. strengthening the heat transfer process of a molten pool;
3. removing hydrogen, nitrogen and impurities in the steel through a carbon-oxygen reaction;
4. foam slag can be produced and an emulsion phase can be formed;
5. the strong stirring action of the carbon-oxygen reaction can homogenize the composition and temperature of the melt and influence the progress of other reactions.
Therefore, the device and the method for shortening the smelting period of the electric furnace steel making can stably provide enough oxygen for the large electric furnace through equipment configuration and method optimization, increase the effect of carbon-oxygen reaction in the steel making process, improve the productivity, reduce the energy consumption, reduce the production cost and improve the economic benefit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. A device for shortening the smelting period of electric furnace steel making is characterized by comprising: the system comprises an oxygen generation system, a compression system, a storage system, an oxygen station valve chamber and an electric furnace valve station;
the oxygen generation system is used for producing oxygen, the compression system is used for compressing the oxygen from the oxygen generation system, the storage system is used for storing the oxygen from the compression system, the oxygen station valve chamber is used for regulating the pressure of the oxygen from the storage system for the first time, and the electric furnace valve station is used for regulating the pressure of the oxygen after the oxygen is regulated for the second time through the oxygen station valve chamber;
the electric furnace valve station is communicated with the electric furnace.
2. The plant of claim 1, wherein the oxygen generation system comprises an air separation oxygen generation system, further configured to produce nitrogen and liquid argon;
preferably, the gas production rate of the oxygen generation system is 18000-20000m3/h。
3. The apparatus of claim 2, wherein the compression system comprises an oxygen compressor, a nitrogen compressor, and a liquid argon pump; the oxygen compressor is used for compressing the oxygen that comes from empty system oxygen system that divides of dividing, the nitrogen compressor is used for compressing and comes from empty nitrogen gas that divides system oxygen system divides, liquid argon pump is used for the vaporization to come from empty liquid argon that divides system oxygen system divides.
4. The apparatus of claim 2, wherein the storage system comprises an oxygen tank, a nitrogen tank, and an argon tank, all in communication with the compression system.
5. The apparatus of claim 2, further comprising an LF furnace-ladle-caster valve station for secondary regulation of argon pressure after primary regulation through the oxygen station valve chamber.
6. The apparatus according to any one of claims 1 to 5, wherein the electric furnace is provided with a plurality of lances communicating with the furnace valve station.
7. A method for shortening an electric furnace steelmaking smelting period is characterized by comprising the following steps:
the oxygen generation system produces oxygen and then conveys the oxygen to the compression system to compress the oxygen;
inputting the oxygen processed by the compression system into a storage system for storage, and then regulating the oxygen pressure from the storage system once through an oxygen station valve chamber;
and then the pressure is secondarily regulated through an electric furnace valve station, and then the electric furnace is fed for use.
8. The method of claim 7, further comprising:
conveying nitrogen produced by the oxygen production system to a compression system for compression, conveying liquid argon to the compression system for vaporization, and then inputting the liquid argon to a storage system for storage;
and the pressure of the nitrogen and argon from the storage system is adjusted through an oxygen station valve chamber for the first time, then the nitrogen is sent to carbon powder injection, purging and instrument user points for use, and the argon is used after the pressure is adjusted through an LF furnace-ladle-continuous casting machine valve station for the second time.
9. The method of claim 8, wherein after the primary adjustment through the oxygen station valve chamber, the oxygen pressure is 1.4 to 1.6MPa, the nitrogen pressure is 0.4 to 0.6MPa, and the argon pressure is 1.4 to 1.6 MPa;
preferably, after the secondary adjustment of the valve station of the LF furnace-ladle-continuous casting machine, the pressure of argon is 0.8-1.2 MPa;
preferably, the oxygen pressure is 0.8-1.4MPa after the secondary adjustment through the electric furnace valve station.
10. The method according to any one of claims 7 to 9, wherein the oxygen consumption per ton of steel of the electric furnace is 55 to 65m3/t。
CN202010523429.4A 2020-06-10 2020-06-10 Device and method for shortening electric furnace steelmaking smelting period Pending CN111621615A (en)

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Application publication date: 20200904