CN104531946B - Steel scrap steelmaking equipment - Google Patents

Steel scrap steelmaking equipment Download PDF

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Publication number
CN104531946B
CN104531946B CN201410771689.8A CN201410771689A CN104531946B CN 104531946 B CN104531946 B CN 104531946B CN 201410771689 A CN201410771689 A CN 201410771689A CN 104531946 B CN104531946 B CN 104531946B
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CN
China
Prior art keywords
preheating
steel scrap
steel
scrap
vertical main
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CN201410771689.8A
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Chinese (zh)
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CN104531946A (en
Inventor
潘宏涛
邱明罡
李强
吕明
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中冶京诚工程技术有限公司
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Priority to CN201410771689.8A priority Critical patent/CN104531946B/en
Publication of CN104531946A publication Critical patent/CN104531946A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention provides a kind of steel scrap steelmaking equipment, described steel scrap steelmaking equipment comprises: the auxiliary preheating section of level, is arranged in the horizontal direction; Vertical main preheating section, vertically arranges and connects the auxiliary preheating section of described level; The inner chamber of described vertical main preheating section is the cavity of hollow; Electric arc furnace, connects described vertical main preheating section.The recirculation that the present invention can realize electric arc furnace high-temperature flue gas utilizes, make full use of physical thermal and the chemical heat of electric arc furnace flue gas, twice preheating is carried out to steel scrap, improve pre-thermo-efficiency, can reduce equipment failure rate simultaneously, realize full scrap steel preheating, ton steel is saved power consumption and is about 120kWh/t, flat molten bath can be realized smelt reduction noise, reduce bell unlatching and fume emission, reach the metallurgical effect of energy-saving and environmental protection.

Description

Steel scrap steelmaking equipment
Technical field
The present invention relates to electric-arc furnace steelmaking field, be specifically related to the steel scrap steelmaking equipment for a kind of electric-arc furnace steelmaking.
Background technology
Electric arc furnace produces a large amount of high-temperature flue gas in steelmaking process, temperature is about 1000 ~ 1400 DEG C, containing a large amount of sensible heats and chemical energy, especially during oxygen blast strengthening smelting oxidation period, exhaust gas volumn is maximum, this part energy of abundant recycling carrys out preheating scrap furnace charge, significantly can reduce power consumption, increase economic efficiency.
Scrap steel preheating technology is an important electric arc furnace strengthening smelting technology.When carrying out preheating to steel scrap, heat smoke is by steel scrap stock column, heat is passed to steel scrap, because heat exchange makes steel scrap temperature raise, a large amount of dust simultaneously in flue gas are also filtered and return second stage employ in electric arc furnace with steel scrap, not only increase the recovery rate of steel, also mitigate the dedusting burden of flare system.In addition, due to waste gas, to leave the temperature after preheater lower, and heat smoke also has to scrap steel preheating benefits such as shortening water-cooled smoke pipe length.
Electric arc furnace scrap steel preheating mode conventional at present has vertical shaft electric arc furnace.Vertical shaft electric arc furnace is due to the reverse vertical heat transfer of steel scrap and waste gas, and pre-heat effect is better, and energy-saving effect is obvious, but is provided with finger valve bottom vertical shaft electric arc furnace and holds steel scrap, and easily smashed by steel scrap at when filling with substance, easily get stuck, therefore failure rate is higher simultaneously.
In sum, in prior art, there is following problem: be provided with finger valve bottom vertical shaft electric arc furnace and hold steel scrap, easily smashed by steel scrap at when filling with substance, failure rate is higher.
Summary of the invention
The invention provides a kind of steel scrap steelmaking equipment, to solve the problem that vertical shaft electric arc furnace is easily smashed by steel scrap at when filling with substance, failure rate is higher.
For this reason, the present invention proposes a kind of steel scrap steelmaking equipment, and described steel scrap steelmaking equipment comprises:
The auxiliary preheating section of level, is arranged in the horizontal direction;
Vertical main preheating section, vertically arranges and connects the auxiliary preheating section of described level; The inner chamber of described vertical main preheating section is the cavity of hollow;
Electric arc furnace, connects described vertical main preheating section.
Further, the auxiliary preheating section of described level comprises: the charge section be connected and preheating chamber, and described preheating chamber connects described vertical main preheating section, in described preheating chamber, steel scrap carries out a preheating, utilizes electric arc furnace waste gas to carry out secondary preheating to the steel scrap after a preheating in vertical main preheating section.
Further, the auxiliary preheating section of described level also comprises: be arranged on the travelling belt bottom described charge section and preheating chamber.
Further, described steel scrap steelmaking equipment also comprises: for the oxygen jet of secondary combustion, is arranged on vertical main preheating section.
Further, described steel scrap steelmaking equipment also comprises: oxygen rifle, is arranged on the furnace wall of electric arc furnace.
Further, in described vertical main preheating section, bottom steel scrap holds top steel scrap, and along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously.
Further, in steel-making course of the electric arc furnace, utilize low-temperature flue gas can by cold scrap steel preheating to more than 200 DEG C at the auxiliary preheating section of level, rely on the heat of high-temperature flue gas and secondary combustion by more than scrap steel preheating to 600 DEG C, full scrap steel preheating can be realized at vertical main preheating section.
Further, described travelling belt is the adiabatic travelling belt of energy speed governing.
In the present invention, in vertical main preheating section, inner chamber is the cavity of hollow, finger valve is not provided with in vertical main preheating section, bottom steel scrap holds top steel scrap, and along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously, solves vertical shaft electric arc furnace easily by the problem that steel scrap smashes, decreases equipment failure rate.
In vertical main preheating section, bottom steel scrap directly contacts with molten bath, improve the heat transfer efficiency between molten iron and steel scrap, because steel scrap does not directly contact with electrode, smelting process noise can be reduced, reduce the fluctuation in molten bath, realize flat molten bath to smelt, oxygen rifle is set on the electric arc furnace furnace wall in this region simultaneously, for strengthening melting bath stirring, the heat transfer between promotion molten iron and steel scrap and the fusing of steel scrap.In melting process, rely on bottom steel scrap to hold top steel scrap, along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously.
Adopt the present invention can overcome the shortcoming that Consteel electric furnace pre-heat effect is poor and vertical shaft arc furnace equipment failure rate is high, the recirculation realizing electric arc furnace high-temperature flue gas utilizes, make full use of physical thermal and the chemical heat of electric arc furnace flue gas, twice preheating is carried out to steel scrap, improve pre-thermo-efficiency, equipment failure rate can be reduced simultaneously, realize full scrap steel preheating, ton steel is saved power consumption and is about 120kWh/t, flat molten bath can be realized smelt reduction noise, reduce bell unlatching and fume emission, reach the metallurgical effect of energy-saving and environmental protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of steel scrap steelmaking equipment of the present invention.
Drawing reference numeral illustrates:
1. the auxiliary preheating section of level, 2. vertical main preheating section, 3. electric arc furnace, 4. charge section, 5. feed travelling belt, 6. preheating chamber, 7. preheating chamber travelling belt, 8. oxygen jet, 9. oxygen rifle
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the present invention is described.
As shown in Figure 1, steel scrap steelmaking equipment of the present invention comprises:
The auxiliary preheating section 1 of level, is arranged in the horizontal direction;
Vertical main preheating section 2, vertically arranges and is connected to the auxiliary preheating section of described level in downstream; The inner chamber of described vertical main preheating section is the cavity of hollow, is not provided with finger valve in vertical main preheating section 2; In vertical main preheating section, the electric arc furnace flue gas up to 1200-1400 DEG C and steel scrap carry out vertical reverse heat transfer;
Electric arc furnace 3, is connected to described vertical main preheating section 2 downstream.
In vertical main preheating section 2, inner chamber is the cavity of hollow, finger valve is not provided with in vertical main preheating section, bottom steel scrap holds top steel scrap, and along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously, solves vertical shaft electric arc furnace easily by the problem that steel scrap smashes, decreases equipment failure rate.
Further, in described vertical main preheating section, bottom steel scrap holds top steel scrap, and along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously.In vertical main preheating section, bottom steel scrap directly contacts with molten bath, improves the heat transfer efficiency between molten iron and steel scrap, because steel scrap does not directly contact with electrode, can reduce smelting process noise, reduces the fluctuation in molten bath, realizes flat molten bath and smelts.
Further, the auxiliary preheating section 1 of described level comprises: the charge section 4 be connected and preheating chamber 6, described preheating chamber 6 connects described vertical main preheating section, in described preheating chamber 6, steel scrap carries out a preheating, utilizes electric arc furnace waste gas to carry out secondary preheating to the steel scrap after a preheating in vertical main preheating section.Through twice preheating, the waste heat preheating scrap in electric arc furnace flue gas can be made full use of, reach the metallurgical effect of energy-saving and environmental protection.
Further, in steel-making course of the electric arc furnace, utilize low-temperature flue gas can by cold scrap steel preheating to more than 200 DEG C at the auxiliary preheating section of level, rely on the heat of high-temperature flue gas and secondary combustion by more than scrap steel preheating to 600 DEG C, full scrap steel preheating can be realized at vertical main preheating section.Like this, ton steel is saved power consumption and is about 120kWh/t, can realize flat molten bath and smelt reduction noise, reduces bell unlatching and fume emission.
Further, the auxiliary preheating section of described level also comprises: be arranged on the travelling belt bottom described charge section and preheating chamber.The bottom of charge section 4 is provided with travelling belt 5, travelling belt 7 is provided with bottom preheating chamber, the cold steel scrap loaded is sent in preheating chamber 6 and is carried out a preheating by travelling belt 5, and the steel scrap after preheating chamber 6 preheatings continues through travelling belt 7 and sends into vertical main preheating section 2 and carry out secondary preheating; By travelling belt can be stable realize a preheating and secondary preheating.Further, described travelling belt is the adiabatic travelling belt of energy speed governing, to realize heat-resisting function and the molten bath situation conveying steel scrap according to electric arc furnace.
Further, described steel scrap steelmaking equipment also comprises: for the oxygen jet 8 of secondary combustion, is arranged on vertical main preheating section.The oxygen be blown into by oxygen jet 8 and CO reaction produce CO 2, release a large amount of chemical heat, the waste gas after burning is used for preheating scrap, increases the temperature head of steel scrap and flue gas, improves scrap steel preheating effect, relies on the heat of high-temperature flue gas and secondary combustion by scrap steel preheating to 650-700 DEG C.
Further, described steel scrap steelmaking equipment also comprises: oxygen rifle 9, is arranged on the furnace wall of electric arc furnace 3.Electric arc furnace furnace wall is arranged oxygen rifle, for strengthening melting bath stirring, the heat transfer between promotion molten iron and steel scrap and the fusing of steel scrap.
Working process of the present invention is:
In steelmaking process, utilize magnet suspender or steel scrap basket that cold steel scrap is added charge section continuously, then utilize the adiabatic travelling belt of adjustable speed to be sent constantly into by steel scrap in the preheating chamber of the auxiliary preheating section of level and carry out preheating.Electric arc furnace flue gas in preheating chamber is about 500-700 DEG C in temperature after vertical main preheating section, heat exchange is carried out with the steel scrap in horizontal preheating chamber, electric furnace flue gas and steel scrap carry out the reverse heat transfer of level, after a preheating chamber preheating, the temperature of steel scrap will be increased to more than 200 DEG C, and such as steel scrap temperature rises to about 250 DEG C.
Steel scrap after a preheating sends into vertical main preheating section through preheating chamber travelling belt, in vertical main preheating section, vertical reverse heat transfer is carried out up to 1000-1400 DEG C of electric arc furnace flue gas and steel scrap, steel scrap fully contacts with high-temperature flue gas, add heat transfer area, heat transfer efficiency is high, relies on the heat of high-temperature flue gas and secondary combustion by more than scrap steel preheating to 600 DEG C, be such as 650-700 DEG C, the steel scrap after preheating adds continuously in electric arc furnace and carries out melting.Steel scrap after preheating and the molten bath contact in electric arc furnace, along with the continuous fusing of vertical main preheating section bottom steel scrap, top steel scrap adds gradually in electric arc furnace and carries out melting, realizes full scrap steel preheating, saves power consumption and is about 120kWh/t.
In working process of the present invention, because steel scrap is direct and electrode contact, flat molten bath can be realized and smelt reduction noise, reduce bell unlatching and fume emission, reach the metallurgical effect of energy-saving and environmental protection.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.For each integral part of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.

Claims (8)

1. a steel scrap steelmaking equipment, is characterized in that, described steel scrap steelmaking equipment comprises:
The auxiliary preheating section of level, is arranged in the horizontal direction;
Vertical main preheating section, vertically arranges and connects the auxiliary preheating section of described level; The inner chamber of described vertical main preheating section is the cavity of hollow;
Electric arc furnace, connects described vertical main preheating section.
2. steel scrap steelmaking equipment as claimed in claim 1, it is characterized in that, the auxiliary preheating section of described level comprises: the charge section be connected and preheating chamber, described preheating chamber connects described vertical main preheating section, in described preheating chamber, steel scrap carries out a preheating, utilizes electric arc furnace waste gas to carry out secondary preheating to the steel scrap after a preheating in vertical main preheating section.
3. steel scrap steelmaking equipment as claimed in claim 2, it is characterized in that, described steel scrap steelmaking equipment also comprises: be arranged on the travelling belt bottom described charge section and preheating chamber.
4. steel scrap steelmaking equipment as claimed in claim 1, it is characterized in that, described steel scrap steelmaking equipment also comprises: for the oxygen jet of secondary combustion, is arranged on vertical main preheating section.
5. steel scrap steelmaking equipment as claimed in claim 1, it is characterized in that, described steel scrap steelmaking equipment also comprises: oxygen rifle, is arranged on the furnace wall of electric arc furnace.
6. steel scrap steelmaking equipment as claimed in claim 1, it is characterized in that, in described vertical main preheating section, bottom steel scrap holds top steel scrap, and along with the continuous fusing of bottom steel scrap, top steel scrap slowly declines continuously.
7. steel scrap steelmaking equipment as claimed in claim 4, it is characterized in that, utilize low-temperature flue gas can by cold scrap steel preheating to more than 200 DEG C at the auxiliary preheating section of level in steel-making course of the electric arc furnace, rely on the heat of high-temperature flue gas and secondary combustion by more than scrap steel preheating to 600 DEG C, full scrap steel preheating can be realized at vertical main preheating section.
8. steel scrap steelmaking equipment as claimed in claim 3, is characterized in that, described travelling belt is the adiabatic travelling belt of energy speed governing.
CN201410771689.8A 2014-12-12 2014-12-12 Steel scrap steelmaking equipment CN104531946B (en)

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CN104531946B true CN104531946B (en) 2016-03-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105132619B (en) * 2015-09-09 2017-05-17 郭智宜 Scrap steel preheating and continuous feeding system constructed based on waste heat recovering channel of electric-arc furnace and application method of system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2405174Y (en) * 2000-01-07 2000-11-08 中国船舶重工集团公司第七研究院第七○三研究所 Equipment for preheating waste steel using flue gas from vertical kiln-electric furnace combination
CN2573970Y (en) * 2002-10-25 2003-09-17 西安华兴电炉有限公司 Vertical continuous side feeding preheating environment protection device for arc furnace
CN201413039Y (en) * 2009-06-12 2010-02-24 中冶赛迪工程技术股份有限公司 Device for continuously charging and preheating metal balk cargo of electric furnace
CN201463506U (en) * 2009-06-23 2010-05-12 西安电炉研究所有限公司 Steel scrap preheating device of electric arc furnace
CN101748241A (en) * 2008-12-22 2010-06-23 中冶赛迪工程技术股份有限公司 Device and method for continuously charging and preheating waste steel for electric furnace
CN201672810U (en) * 2010-04-08 2010-12-15 中冶赛迪工程技术股份有限公司 Scrap steel preheating conveying device
CN204281779U (en) * 2014-12-12 2015-04-22 中冶京诚工程技术有限公司 Steel scrap steelmaking equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2405174Y (en) * 2000-01-07 2000-11-08 中国船舶重工集团公司第七研究院第七○三研究所 Equipment for preheating waste steel using flue gas from vertical kiln-electric furnace combination
CN2573970Y (en) * 2002-10-25 2003-09-17 西安华兴电炉有限公司 Vertical continuous side feeding preheating environment protection device for arc furnace
CN101748241A (en) * 2008-12-22 2010-06-23 中冶赛迪工程技术股份有限公司 Device and method for continuously charging and preheating waste steel for electric furnace
CN201413039Y (en) * 2009-06-12 2010-02-24 中冶赛迪工程技术股份有限公司 Device for continuously charging and preheating metal balk cargo of electric furnace
CN201463506U (en) * 2009-06-23 2010-05-12 西安电炉研究所有限公司 Steel scrap preheating device of electric arc furnace
CN201672810U (en) * 2010-04-08 2010-12-15 中冶赛迪工程技术股份有限公司 Scrap steel preheating conveying device
CN204281779U (en) * 2014-12-12 2015-04-22 中冶京诚工程技术有限公司 Steel scrap steelmaking equipment

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