CN103196296B - Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert - Google Patents
Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert Download PDFInfo
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- CN103196296B CN103196296B CN201310131182.1A CN201310131182A CN103196296B CN 103196296 B CN103196296 B CN 103196296B CN 201310131182 A CN201310131182 A CN 201310131182A CN 103196296 B CN103196296 B CN 103196296B
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Abstract
The invention discloses a scrap preheater of an electric-arc furnace step disturbance culvert. The scrap preheater comprises a heat-exchanging culvert, the low side of the heat-exchanging culvert is connected with a furnace, the high side of the heat-exchanging culvert is respectively connected with a smoke-collecting and dust-removing pipe and a feed sealing device, the heat-exchanging culvert comprises a material- conveying groove and a smoke guide cover, the material-conveying groove is used for conveying steel scrap materials to the electric-arc furnace, the smoke guide cover is covered on the material- conveying groove and is used for guiding smoke, the heat-exchanging culvert is provided with at least one cross-section abrupt change structure in the height-extending direction, and the cross-section abrupt change structure is used for disturbing the steel scrap material flow state and the smoke flow state. The invention further discloses a preheating method of the electric-arc furnace step disturbance culvert, and the steel scrap materials can be added to the material-conveying groove by the feed sealing device; the steel scrap material flow state is disturbed under the combined action of the cross-section abrupt change structure on the heat-exchanging culvert and horizontal vibration, so that the steel scrap materials have air permeability in a certain area; and the smoke flow state can be disturbed in the smoke guide cover, so that the smoke and the steel scrap materials can be subjected to heat exchanging fully.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of step disturbance exhausting scrap preheater and pre-heating mean of electric arc furnaces.
Background technology
In electric furnace steel making, energy-saving and environmental protection and consumption reduction are one of core technologies of global Electric Furnace Steelmaking development always.Two decades years had multiple design both at home and abroad, but due to its technical difficulty very large, only have the actual use of a small amount of Technical investment at present, its Typical Representative as: publication number is finger shaft disclosed in the German patent application of DE4025249A1; A kind of CONSTEEL technology vibrating continuous charging of publication number to be the thruster vertical shaft feeding technique of the U.S. Patent Application Publication of US2007/0013112A1 and publication number the be U.S. Patent Publication of US5400358.
Wherein, vertical shaft preheating of feeding in raw material adopts plume penetration steel scrap layer, and pre-heating energy-saving is effective, can reach a ton energy-saving effect of steel 60 ~ 100kw.h, but its equipment is easily smashed by steel scrap, the large impact production of maintenance.And CONSTEEL is a kind of horizontal continuity feeding technology, electric furnace stabilising arc can be realized smelt, environmental protection and consumption of electrode reduce, greatly can reduce the production process expense of electric furnace, but in this technology, steel scrap only has upper materials to be heated, therefore scrap steel preheating poor effect, according to domestic and international, its average energy-saving effect only has a ton steel 25kw.h; In addition, owing to will improve the heat exchange efficiency with raw material (steel scrap), it is thinner that the steel scrap in delivery chute piles height on the conveyor belt, and this must strengthen the length of preheating section, causes equipment total length to reach 90 ~ 100m, and this is very disadvantageous to the layout in workshop; And the dynamic seal (packing) that also exists in this technology is leaked gas comparatively serious, the defect larger to the capacity requirement of blower fan etc.
For improving the heat exchange efficiency in continuous conveying process, the applicant propose and the Chinese patent that the patent No. is ZL201010270535.2 discloses a kind of scrap steel pre-heating conveyor with short process, and propose the design of step trough heat exchange conveying wherein, the contact area of flue gas and material (steel scrap) is increased by the gap disperse flue gas between ladder, improve the utilization ratio of fume afterheat, this conception theory can obtain good heat exchange efficiency, but find in actual design process: this scrap steel pre-heating conveyor with short process exists hierarchic structure complexity, heat load intensity very large (two-sided direct and smoke contacts), the poor reliability of ladder, the defect of the short and maintainability difference of working life, be difficult at short notice overcome, in addition, the hermatic door of hot-zone is also a dangerous spot, in some sense, the reliability of equipment is veto by one vote.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of electric arc furnaces step disturbance exhausting scrap preheater and pre-heating mean, this electric arc furnaces step disturbance exhausting scrap preheater effectively can not only improve the heat exchange efficiency between flue gas and steel scrap, and structure is simple, manufacture easy maintenance, the reliability of equipment is higher.
For achieving the above object, the present invention first proposed a kind of electric arc furnaces step disturbance exhausting scrap preheater, comprise in tilt install and for carrying the heat exchange exhausting of steel scrap material, the low side of described heat exchange exhausting is connected with electric furnace, high side is connected with feeding seal device with collection fume and dust pipe respectively, described heat exchange exhausting comprise for electric furnace conveying steel scrap material feeding groove and to mount cover on feeding groove and for the kuppe of flue gas water conservancy diversion, and described heat exchange exhausting is provided with at least one for upsetting the abrupt change of cross-section structure of steel scrap flow state and flue gas fluidised form on its length bearing of trend.
Further, described abrupt change of cross-section structure comprises and being arranged on for upsetting the hierarchic structure of steel scrap flow state on described feeding groove, and is provided with sealing plate between two cascaded surfaces of described hierarchic structure.
Further, described abrupt change of cross-section structure also comprises and is arranged on for upsetting the bulging male structure of flue gas fluidised form on described kuppe, and described bulging male structure is provided with the protuberance towards described feeding groove bottom land projection.
Further, described feeding groove is set to adopt and is rigidly connected and the integral structure of level of synchronization vibration feeding.
Further, described hierarchic structure and described bulging male structure one_to_one corresponding are arranged, and described bulging male structure correspondence is arranged on the side of described hierarchic structure towards electric furnace.
Further, described feeding groove is provided with at least two-stage hierarchic structure, and the difference in height of hierarchic structure described in every one-level is 1/3 ~ 4 times of steel scrap average dimension, spacing distance between adjacent two-stage hierarchic structure is 2 ~ 20 times of steel scrap average dimension, the steel scrap total block data of each piece of steel scrap maximum length sum in the steel scrap of described steel scrap average dimension=be totally transferred/be totally transferred steel scrap.
Further, the bottom land of the feeding groove between adjacent two-stage hierarchic structure is in being horizontally disposed with or being obliquely installed; Bending part rounding between described hierarchic structure and the bottom land of feeding groove or chamfering or be provided with transitional slope face.
Further, gasification cooling system for waste heat recovery is equipped with in described kuppe and drum male structure.
Further, correspondingly with described hierarchic structure on described kuppe be provided with at least two bulging male structure, between adjacent two drum male structure, be provided with air conduit or burner.
The invention allows for a kind of electric arc furnaces step disturbance exhausting scrap steel preheating method adopting electric arc furnaces step disturbance exhausting scrap preheater described above, feeding seal device is utilized to add steel scrap material to described feeding groove, under abrupt change of cross-section structure in described heat exchange exhausting and the acting in conjunction of horizontal vibration, upset the fluidised form of steel scrap material, steel scrap material is made to have gas permeability at regional area, and under the effect of described abrupt change of cross-section structure, upset the fluidised form of flue gas in described kuppe, make flue gas and the abundant heat exchange of steel scrap material.
Beneficial effect of the present invention is:
A kind of electric arc furnaces step disturbance exhausting scrap preheater of the present invention, by arranging the abrupt change of cross-section structure for upsetting steel scrap flow state and flue gas fluidised form in heat exchange exhausting, effectively can improve the heat exchange efficiency between steel scrap material and flue gas, reason is as follows:
Heat exchange principle shows, carries out the medium of heat exchange, especially gas, and the heat exchange efficiency between flow velocity and turbulence level Determines medium, therefore, it is possible to the method destroying gas steady flow just can improve heat exchange well; To steel scrap material and the flue gas of flowing relatively in same heat exchange exhausting, the motion fluidised form of local failure steel scrap material and the motion fluidised form of flue gas, just can improve both exposure levels, improves heat exchange efficiency;
Therefore, electric arc furnaces step disturbance exhausting scrap preheater of the present invention, under the prerequisite substantially not changing heat-exchanger rig macrostructure, can destroy the flow field of heat transferring medium, improves the effect of scrap steel preheating.
The contrast of a kind of electric arc furnaces step disturbance exhausting scrap preheater of the present invention and prior art is as follows:
1) compared with the preheating method of the ladder penetration of equal length, although pre-heat effect of the present invention is slightly poor, but the reliability of equipment improves greatly, wherein, the inner surface of feeding groove is mainly covered by steel scrap material, and thermic load is less, the thermal safety of feeding groove is improved, and (feeding groove is water-cooled, if ladder heat load intensity is large, then the easiest leakage point, can cause Safety production questions after leaking); And in the hierarchic structure of electric arc furnaces step disturbance exhausting scrap preheater of the present invention, be provided with sealing plate, the reinforcement greatly to feeding groove intensity on the one hand, eliminate the possibility that existing feeding groove gap is blocked on the other hand, reliability and the security of equipment improve greatly; And the raising of the disorderly degree of flue gas flow field, effect of kuppe Vaporizing cooling can be improved, increase Steam Recovery;
2) compared with the horizontal conveying belt of COSTEEL, under same length, the heat exchange efficiency of electric arc furnaces step disturbance exhausting scrap preheater of the present invention can improve a lot, like this, shorter equipment can obtain similar scrap steel preheating effect, therefore electric arc furnaces step disturbance exhausting scrap preheater of the present invention has equipment advantage small and exquisite, flexible for installation, be more suitable for the transformation of old factory and utilize existing equipment, reducing investment for trnasforming urban land cost; In addition, hierarchic structure carries out Dynamic Truncation to the steel scrap be implicative of each other, and steel scrap material not easily sticks together in warm, therefore production reliability is high;
In a word, electric arc furnaces step disturbance exhausting scrap preheater of the present invention is skillfully constructed, heat exchange efficiency is improve with simple and reliable structure, the component of relative motion is not had between the parts contacted with flue gas and steel scrap material, therefore high being easy to of equipment dependability manufactures and safeguards, while raising heat exchange efficiency, also there is the advantage that structure is simple, manufacture easy maintenance, there is promotional value.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the structural representation of electric arc furnaces step disturbance exhausting scrap preheater embodiment of the present invention;
Fig. 2 is the first structural representation of heat exchange exhausting;
Fig. 3 is the second structural representation of heat exchange exhausting.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in Figure 1, be the structural representation of electric arc furnaces step disturbance exhausting scrap preheater embodiment of the present invention.The electric arc furnaces step disturbance exhausting scrap preheater of the present embodiment, comprise in tilt install and for carrying the heat exchange exhausting 1 of steel scrap material, the low side of heat exchange exhausting 1 is connected with electric furnace 2, high side is connected with feeding seal device 4 with collection fume and dust pipe 3 respectively, heat exchange exhausting 1 comprises for carrying the feeding groove 5 of steel scrap material to electric furnace 2 and mounting cover on feeding groove 5 and for the kuppe 6 of flue gas water conservancy diversion, and heat exchange exhausting 1 is provided with at least one for upsetting the abrupt change of cross-section structure of steel scrap flow state and flue gas fluidised form on its length bearing of trend.
Heat exchange exhausting 1 can adopt various structures to realize: as shown in Figure 2, for the first structural representation of heat exchange exhausting 1, the abrupt change of cross-section structure that this heat exchange exhausting 1 is arranged comprises and being arranged on feeding groove 5 for upsetting the hierarchic structure 7 of steel scrap flow state, and be provided with sealing plate 8 between two cascaded surfaces of hierarchic structure 7, by arranging sealing plate 8, can strengthen the intensity of feeding groove 5, and eliminate the possibility that existing feeding groove 5 gap is blocked, reliability and security improve greatly; As shown in Figure 3, for the first structural representation of heat exchange exhausting 2, the abrupt change of cross-section structure of this heat exchange exhausting 2 is except arranging hierarchic structure 7, also comprise and being arranged on kuppe 6 for upsetting the bulging male structure 9 of flue gas fluidised form, drum male structure 9 is provided with towards the protuberance of described feeding groove 5 bottom land projection, seamlessly transit between drum male structure 9 and kuppe 6, by arranging bulging male structure 9, flue gas fluidised form can be upset further, effect of kuppe 6 Vaporizing cooling can be improved, increase Steam Recovery.
The heat exchange exhausting 1 of the present embodiment adopts the structure shown in Fig. 3, i.e. heat exchange exhausting 1 had both been provided with hierarchic structure 7, be provided with again bulging male structure 9, by arranging hierarchic structure 7, due to the effect of step therein and the effect of vibration of feeding groove 5, the motion fluidised form of local failure steel scrap material, make it have local gas permeability, simultaneously, by the mutation effect of hierarchic structure to heat exchange exhausting 1 cross section, flue gas under the independent role of hierarchic structure or with the acting in conjunction of drum male structure under also can there is fluidised form disorder, and then improve the heat exchange efficiency of flue gas and steel scrap material.Preferably, feeding groove 5 is set to adopt and is rigidly connected and the integral structure of level of synchronization vibration feeding, is namely rigidly connected between sealing plate 8 and two cascaded surfaces, the safety and reliability of further raising equipment.
Preferably, hierarchic structure 7 is arranged with drum male structure 9 one_to_one corresponding, and drum male structure 9 correspondence is arranged on the side of hierarchic structure 7 towards electric furnace, adopts the abrupt change of cross-section structure of this structure, the flue gas of fluidised form disorder is met with the good steel scrap material of local gas permeability just, improves heat exchange efficiency.
Further, feeding groove 5 is provided with at least two-stage hierarchic structure, and the difference in height of every one-level hierarchic structure 7 is 1/3 ~ 4 times of steel scrap average dimension, spacing distance between adjacent two-stage hierarchic structure 7 is 2 ~ 20 times of steel scrap average dimension, the steel scrap total block data of each piece of steel scrap maximum length sum in the steel scrap of steel scrap average dimension=be totally transferred/be totally transferred steel scrap.Experiment shows, the height of hierarchic structure 7 is important parameters, affects steel scrap material by the degree of loosening, and simultaneously when the discrepancy in elevation is larger, the steel scrap of whereabouts easily rolls, and makes steel scrap change heat exchange interface, improves heat exchange efficiency; Length between adjacent two hierarchic structures 7 must have enough spaces, makes steel scrap material when arriving next hierarchic structure, can stop free landing, and controlled operation under extraneous horizontal vibration driving force.The difference in height of the hierarchic structure 7 of the present embodiment is 1 times of steel scrap average dimension, and the spacing distance between adjacent two-stage hierarchic structure 7 is 10 times of steel scrap average dimension.
Further, the bottom land of the feeding groove 5 between adjacent two-stage hierarchic structure 7 is in being horizontally disposed with or being obliquely installed; Bending part rounding between the bottom land of hierarchic structure 7 and feeding groove 5 or chamfering or be provided with transitional slope face, the bottom land of the feeding groove 5 between the adjacent two-stage hierarchic structure 7 of the present embodiment is in being horizontally disposed with, bending part between three hierarchic structures 7 and the bottom land of feeding groove 5 rounding, chamfering and transitional slope face is set respectively, as shown in Figure 3, wearing and tearing can be reduced, certainly, also all can adopt rounding or chamfering between the bottom land of hierarchic structure 7 and feeding groove 5 or transitional slope face is set, being not repeated.
Further, be equipped with the gasification cooling system for waste heat recovery in kuppe 7 and drum male structure 9, namely kuppe 7 and drum male structure 9 are gasification cooling-part.
Further, correspondingly with hierarchic structure 7 on kuppe 6 be provided with at least two bulging male structure 9, be provided with air conduit 10 or burner between adjacent two drum male structure 9, namely form cavity volume between adjacent two bulging male structure 9, between the adjacent two drum male structure 9 of the present embodiment, be provided with air conduit 10.The hierarchic structure 7 of the present embodiment is provided with 3, and male structure 9 is corresponding with hierarchic structure 7 is set to 3 for drum.
The electric arc furnaces step disturbance exhausting scrap preheater of the present embodiment, by arranging the abrupt change of cross-section structure for upsetting steel scrap flow state and flue gas fluidised form in heat exchange exhausting 1, effectively can improve the heat exchange efficiency between steel scrap material and flue gas, reason is as follows:
Heat exchange principle shows, carries out the medium of heat exchange, especially gas, and the heat exchange efficiency between flow velocity and turbulence level Determines medium, therefore, it is possible to the method destroying gas steady flow just can improve heat exchange well; To steel scrap material and the flue gas of flowing relatively in same heat exchange exhausting, the motion fluidised form of local failure steel scrap material and the motion fluidised form of flue gas, just can improve both exposure levels, improves heat exchange efficiency;
Therefore, the electric arc furnaces step disturbance exhausting scrap preheater of the present embodiment, under the prerequisite substantially not changing heat-exchanger rig macrostructure, can destroy the flow field of heat transferring medium, improves the effect of scrap steel preheating.
Elaborate below in conjunction with the detailed description of the invention of above-mentioned electric arc furnaces step disturbance exhausting scrap preheater to electric arc furnaces step disturbance exhausting scrap steel preheating method of the present invention.
The present embodiment adopts the electric arc furnaces step disturbance exhausting scrap steel preheating method of electric arc furnaces step disturbance exhausting scrap preheater described above, feeding seal device 4 is utilized to add steel scrap material to feeding groove 5, under the abrupt change of cross-section structure of heat exchange exhausting 1 and the acting in conjunction of horizontal vibration, upset the fluidised form of steel scrap material, steel scrap material is made to have gas permeability at regional area, and under the effect of abrupt change of cross-section structure, upset the fluidised form of flue gas in kuppe 6, make flue gas and the abundant heat exchange of steel scrap material.
Concrete, in steel scrap material conveying process, utilize the hierarchic structure 7 be arranged on feeding groove 5, under the drop effect of hierarchic structure 7 and under the effect of vibration of feeding groove 5, the motion fluidised form of local failure steel scrap material, makes it have local gas permeability, simultaneously, by the mutation effect of hierarchic structure to heat exchange exhausting 1 cross section, flue gas under the independent role of hierarchic structure or with the acting in conjunction of drum male structure 9 under also can there is fluidised form disorder, and then improve the heat exchange efficiency of flue gas and steel scrap material.
Therefore, the electric arc furnaces step disturbance exhausting scrap steel preheating method of the present embodiment, be skillfully constructed, heat exchange efficiency is improve with simple and reliable structure, there is no the component of relative motion between the parts contacted with flue gas and steel scrap material, therefore high being easy to of equipment dependability manufactures and safeguards, while raising heat exchange efficiency, also there is the advantage that structure is simple, manufacture easy maintenance, there is promotional value.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (8)
1. an electric arc furnaces step disturbance exhausting scrap preheater, it is characterized in that: comprise in tilt install and for carrying the heat exchange exhausting of steel scrap material, the low side of described heat exchange exhausting is connected with electric furnace, high side is connected with feeding seal device with collection fume and dust pipe respectively, described heat exchange exhausting comprise for electric furnace conveying steel scrap material feeding groove and to mount cover on feeding groove and for the kuppe of flue gas water conservancy diversion, and described heat exchange exhausting is provided with at least one for upsetting the abrupt change of cross-section structure of steel scrap flow state and flue gas fluidised form on its length bearing of trend,
Described abrupt change of cross-section structure comprises and being arranged on for upsetting the hierarchic structure of steel scrap flow state on described feeding groove, and is provided with sealing plate between two cascaded surfaces of described hierarchic structure;
Described feeding groove is provided with at least two-stage hierarchic structure, and the difference in height of hierarchic structure described in every one-level is 1/3 ~ 4 times of steel scrap average dimension, spacing distance between adjacent two-stage hierarchic structure is 2 ~ 20 times of steel scrap average dimension, the steel scrap total block data of each piece of steel scrap maximum length sum in the steel scrap of described steel scrap average dimension=be totally transferred/be totally transferred steel scrap.
2. electric arc furnaces step disturbance exhausting scrap preheater according to claim 1, it is characterized in that: described abrupt change of cross-section structure also comprises and is arranged on for upsetting the bulging male structure of flue gas fluidised form on described kuppe, and described bulging male structure is provided with the protuberance towards described feeding groove bottom land projection.
3. electric arc furnaces step disturbance exhausting scrap preheater according to claim 2, is characterized in that: described feeding groove is set to adopt and is rigidly connected and the integral structure of level of synchronization vibration feeding.
4. the electric arc furnaces step disturbance exhausting scrap preheater according to Claims 2 or 3, is characterized in that: described hierarchic structure and described bulging male structure one_to_one corresponding are arranged, and described bulging male structure correspondence is arranged on the side of described hierarchic structure towards electric furnace.
5. electric arc furnaces step disturbance exhausting scrap preheater according to claim 4, is characterized in that: the bottom land of the feeding groove between adjacent two-stage hierarchic structure is in being horizontally disposed with or being obliquely installed; Bending part rounding between described hierarchic structure and the bottom land of feeding groove or chamfering or be provided with transitional slope face.
6. the electric arc furnaces step disturbance exhausting scrap preheater according to Claims 2 or 3, is characterized in that: be equipped with gasification cooling system for waste heat recovery in described kuppe and drum male structure.
7. the electric arc furnaces step disturbance exhausting scrap preheater according to Claims 2 or 3, is characterized in that: correspondingly with described hierarchic structure on described kuppe be provided with at least two bulging male structure, is provided with air conduit or burner between adjacent two drum male structure.
8. one kind adopts the electric arc furnaces step disturbance exhausting scrap steel preheating method of electric arc furnaces step disturbance exhausting scrap preheater as described in any one of claim 1-7, it is characterized in that: utilize feeding seal device to add steel scrap material to described feeding groove, under abrupt change of cross-section structure in described heat exchange exhausting and the acting in conjunction of horizontal vibration, upset the fluidised form of steel scrap material, steel scrap material is made to have gas permeability at regional area, and under the effect of described abrupt change of cross-section structure, upset the fluidised form of flue gas in described kuppe, make flue gas and the abundant heat exchange of steel scrap material.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310131182.1A CN103196296B (en) | 2013-04-16 | 2013-04-16 | Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert |
| EP13875423.9A EP2960607B1 (en) | 2013-02-22 | 2013-06-21 | Arc furnace automatic feeding device |
| US14/769,492 US20160003542A1 (en) | 2013-02-22 | 2013-06-21 | Automatic feeding apparatus for electric arc furnace |
| JP2015558327A JP6341937B2 (en) | 2013-02-22 | 2013-06-21 | Automatic feeder for arc furnace |
| BR112015020265A BR112015020265A2 (en) | 2013-02-22 | 2013-06-21 | automatic feeding machine for electric arc furnace |
| PCT/CN2013/077701 WO2014127597A1 (en) | 2013-02-22 | 2013-06-21 | Arc furnace automatic feeding device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310131182.1A CN103196296B (en) | 2013-04-16 | 2013-04-16 | Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert |
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| CN103196296A CN103196296A (en) | 2013-07-10 |
| CN103196296B true CN103196296B (en) | 2015-07-15 |
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| JP7130909B2 (en) * | 2016-05-30 | 2022-09-06 | シーアイエスディーアイ エンジニアリング カンパニー リミテッド | Arc Furnace Sealed Feeding Device |
| DE102018126161A1 (en) * | 2018-10-22 | 2020-04-23 | Inteco Melting And Casting Technologies Gmbh | Plant for melting scrap and method for operating the plant |
| CN110736354A (en) * | 2019-10-17 | 2020-01-31 | 广西钦州恒星锰业有限责任公司 | Automatic furnace burden settlement heater |
| CN111457740B (en) * | 2020-05-15 | 2024-09-13 | 中冶赛迪工程技术股份有限公司 | Groove structure of module combined type scrap steel preheating device |
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| CN115595399B (en) * | 2022-09-07 | 2023-11-14 | 中冶长天国际工程有限责任公司 | Process and system for hot charging of scrap steel by cooperation of preheating and direct reduction of iron |
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