CN203231651U - Step disturbance channel waste steel preheating device for electric-arc furnace - Google Patents
Step disturbance channel waste steel preheating device for electric-arc furnace Download PDFInfo
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- CN203231651U CN203231651U CN 201320190797 CN201320190797U CN203231651U CN 203231651 U CN203231651 U CN 203231651U CN 201320190797 CN201320190797 CN 201320190797 CN 201320190797 U CN201320190797 U CN 201320190797U CN 203231651 U CN203231651 U CN 203231651U
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Abstract
The utility model discloses a step disturbance channel waste steel preheating device for an electric-arc furnace. The step disturbance channel waste steel preheating device comprises a heat exchange channel, wherein the lower side end of the heat exchange channel is connected with the electric furnace, and the higher side end of the heat exchange channel is respectively connected with a smoke collecting and dust removal pipe and a charging seal device. The heat exchange channel comprises a material conveying trough for conveying waste steel materials to the electric furnace and a flow guide cover for covering the material conveying trough and guiding smoke, and is provided with at least one section abrupt change structure for disturbing flow regime of the waste steel materials and flow regime of the smoke in the length extension direction of the heat exchange channel. The step disturbance channel waste steel preheating device for the electric-arc furnace is ingenious in conception, improves heat exchange efficiency by the aid of a simple and reliable structure, has the advantages of being simple in structure and convenient to manufacture and maintain, and is worth of popularization. In addition, Members performing relative motion do not exist among parts contacting with the smoke and the waste steel materials, so that the device is high in reliability and easy to manufacture and maintain.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of ladder disturbance letter road scrap preheater of electric arc furnaces.
Background technology
In the electric furnace steel making, energy-saving and environmental protection and consumption reduction are one of core technologies of global Electric Furnace Steelmaking development always.Multiple design was arranged over 20 years both at home and abroad, but because its technical difficulty is very big, only has a spot of technology to drop into actual the use at present, its typical case's representative as: publication number is the disclosed finger shaft furnace of the German patent application of DE4025249A1; Publication number is the thruster vertical shaft feeding technique of U.S. Patent Application Publication of US2007/0013112A1 and the disclosed a kind of CONSTEEL technology of vibrating continuous charging of United States Patent (USP) that publication number is US5400358.
Wherein, the reinforced pre-thermal recovery flue gas of vertical shaft penetrates the steel scrap layer, and pre-heating energy-saving is effective, can reach ton energy-saving effect of steel 60～100kw.h, but its equipment smashes by steel scrap easily, and maintenance is big to influence production.And CONSTEEL is a kind of horizontal continuous-feeding technology, can realize the smelting of electric furnace stabilising arc, environmental protection and consumption of electrode reduce, can reduce the production process expense of electric furnace greatly, but in this technology, steel scrap has only upper materials to be heated, so the steel scrap pre-heat effect is not good, according to domestic and international, its average energy-saving effect has only a ton steel 25kw.h; In addition, owing to will improve heat exchange efficiency with raw material (steel scrap), the steel scrap in the delivery chute is thinner at conveyer belt heap height, and the length that this must strengthen preheating section causes the equipment total length can reach 90～100m, and this layout to the workshop is very disadvantageous; And also exist dynamic seal (packing) gas leakage more serious in this technology, to the bigger defective of capacity requirement of blower fan etc.
For improving the heat exchange efficiency in the continuous conveying process, the applicant proposes and the patent No. is that the Chinese patent of ZL201010270535.2 discloses a kind of scrap steel pre-heating conveyor with short process, and the design that the step trough heat exchange is carried proposed therein, increase the contact area of flue gas and material (steel scrap) by the slit disperse flue gas between ladder, improve the utilization ratio of fume afterheat, can obtain heat exchange efficiency preferably on this conception theory, but find in the actual design process: there is the hierarchic structure complexity in this scrap steel pre-heating conveyor with short process, heat load intensity very big (two-sided directly contact with flue gas), the poor reliability of ladder, short and the maintainable poor defective of working life, be difficult at short notice overcome, in addition, the hermatic door of hot-zone also is 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 ladder disturbance letter road scrap preheater, this electric arc furnaces ladder disturbance letter road scrap preheater not only can effectively improve the heat exchange efficiency between flue gas and the steel scrap, and it is simple in structure, make easy maintenance, the reliability of equipment is higher.
For achieving the above object, electric arc furnaces ladder disturbance letter of the present invention road scrap preheater, comprise being and tilt to install and for delivery of the heat exchange letter road of steel scrap material, the low side in described heat exchange letter road links to each other with electric furnace, high side links to each other with reinforced sealing device with collection fume and dust pipe respectively, described heat exchange letter road comprises for feeding groove from the steel scrap material to electric furnace that carry and lid and is contained on the feeding groove and is used for the kuppe of flue gas water conservancy diversion, and described heat exchange letter road is provided with the abrupt change of cross-section structure that at least one is used for upsetting steel scrap material fluidised form and flue gas fluidised form at its length bearing of trend.
Further, described abrupt change of cross-section structure comprises and is arranged on the described feeding groove hierarchic structure that is used for upsetting steel scrap material fluidised form, and is provided with sealing plate between two cascaded surfaces of described hierarchic structure.
Further, described abrupt change of cross-section structure comprises also and is arranged on the described kuppe the bulging male structure that is used for upsetting the flue gas fluidised form that described bulging male structure is provided with the protuberance towards described feeding groove bottom land projection.
Further, the cascaded surface of described feeding groove and sealing plate are for adopting rigidly connected integral structure and do the level of synchronization vibration under the effect of driving force.
Further, described hierarchic structure and the corresponding setting one by one of described bulging male structure, and described bulging male structure correspondence is arranged on described hierarchic structure towards a side of electric furnace.
Further, described feeding groove is provided with two-stage hierarchic structure at least, and the difference in height of the described hierarchic structure of each grade is 1/3～4 times of the steel scrap average dimension, spacing distance between the adjacent two-stage hierarchic structure is 2～20 times of steel scrap average dimension, each piece steel scrap maximum length sum in the steel scrap of described steel scrap average dimension=totally be transferred/totally be transferred steel scrap total block data of steel scrap.
Further, the bottom land of the feeding groove between the adjacent two-stage hierarchic structure is and is horizontally disposed with or is obliquely installed; Bending part rounding between the bottom land of described hierarchic structure and feeding groove or chamfering or be provided with the transition inclined plane.
Further, described kuppe and drum are equipped with the gasification cooling system for waste heat recovery in the male structure.
Further, correspondingly with described hierarchic structure on the described kuppe be provided with at least two bulging male structure, be provided with air conduit or burner between the adjacent two drum male structure.
Beneficial effect of the present invention is:
A kind of electric arc furnaces ladder disturbance letter of the present invention road scrap preheater, by be provided for upsetting the abrupt change of cross-section structure of steel scrap material fluidised form and flue gas fluidised form in heat exchange letter road, can effectively improve the heat exchange efficiency between steel scrap material and the flue gas, the reasons are as follows:
The heat exchange principle shows, carries out the medium of heat exchange, gas especially, and flow velocity and turbulence level state have determined the heat exchange efficiency between medium, therefore, can destroy the method for gas steady flow and just can improve heat exchange well; To the steel scrap material and the flue gas that flow relatively in same heat exchange letter road, the motion fluidised form of local failure steel scrap material and the motion fluidised form of flue gas just can be improved both exposure levels, improve heat exchange efficiency;
Therefore, electric arc furnaces ladder disturbance letter of the present invention road scrap preheater can not change under the prerequisite of heat-exchanger rig macrostructure substantially, destroys the flow field of heat transferring medium, improves the effect of steel scrap preheating.
The contrast of a kind of electric arc furnaces ladder disturbance letter road scrap preheater of the present invention and prior art is as follows:
1) compares with the preheating method of the ladder penetration of equal length, though 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 the steel scrap material, and thermic load is less, the thermal safety of feeding groove is improved, and (feeding groove is water-cooled, if the ladder heat load intensity is big, then the easiest leakage point can cause the safety in production problem after leaking); And be provided with sealing plate in the hierarchic structure of electric arc furnaces ladder disturbance letter of the present invention road scrap preheater, be the reinforcement greatly to feeding groove intensity on the one hand, eliminated the possibility that existing feeding groove slit 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 can improve the effect of kuppe vaporization cooling, increases Steam Recovery;
2) compare with the horizontal conveying belt of COSTEEL, under same length, the heat exchange efficiency of electric arc furnaces ladder disturbance letter of the present invention road scrap preheater can improve a lot, like this, short equipment can obtain similar steel scrap pre-heat effect, so electric arc furnaces ladder disturbance letter of the present invention road scrap preheater has equipment advantage small and exquisite, flexible for installation, be more suitable for transforming and utilize existing equipment in old factory, reduce the investment for trnasforming urban land cost; In addition, hierarchic structure is dynamically blocked the steel scrap that is implicative of each other, and the steel scrap material is difficult for sticking together in warm, so production reliability height;
In a word, electric arc furnaces ladder disturbance letter of the present invention road scrap preheater is skillfully constructed, improved heat exchange efficiency with simple and reliable structure, and the member that does not have relative motion between flue gas and the steel scrap material parts in contact, so the equipment dependability height is easy to make and safeguard, when improving heat exchange efficiency, also have advantage simple in structure, as to make easy maintenance, have promotional value.
Description of drawings
In order to make purpose of the present invention, technical scheme and beneficial effect clearer, the invention provides following accompanying drawing and describe:
Fig. 1 is the structural representation of electric arc furnaces ladder disturbance letter road scrap preheater embodiment of the present invention;
Fig. 2 is first kind of structural representation in heat exchange letter road;
Fig. 3 is second kind of structural representation in heat exchange letter road.
The specific embodiment
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 ladder disturbance letter road scrap preheater embodiment of the present invention.The electric arc furnaces ladder disturbance letter road scrap preheater of present embodiment, comprise being and tilt to install and for delivery of the heat exchange letter road 1 of steel scrap material, the low side in heat exchange letter road 1 links to each other with electric furnace 2, high side links to each other with reinforced sealing device 4 with collection fume and dust pipe 3 respectively, heat exchange letter road 1 comprises for feeding groove 5 from the steel scrap materials to electric furnace 2 that carry and lid and is contained on the feeding groove 5 and is used for the kuppe 6 of flue gas water conservancy diversion, and heat exchange letter road 1 is provided with the abrupt change of cross-section structure that at least one is used for upsetting steel scrap material fluidised form and flue gas fluidised form at its length bearing of trend.
Heat exchange letter road 1 can adopt multiple structure to realize: as shown in Figure 2, first kind of structural representation for heat exchange letter road 1, the abrupt change of cross-section structure that this heat exchange letter road 1 arranges comprises and is arranged on the hierarchic structure 7 that is used for upsetting steel scrap material fluidised form on the feeding groove 5, and be provided with sealing plate 8 between two cascaded surfaces of hierarchic structure 7, by sealing plate 8 is set, can strengthen the intensity of feeding groove 5, and eliminate the possibility that existing feeding groove 5 slits are blocked, reliability and security improve greatly; As shown in Figure 3, first kind of structural representation for heat exchange letter road 2, the abrupt change of cross-section structure in this heat exchange letter road 2 is except arranging hierarchic structure 7, also comprise and be arranged on the bulging male structure 9 that is used for upsetting the flue gas fluidised form on the kuppe 6, drum male structure 9 is provided with the protuberance towards described feeding groove 5 bottom land projectioies, seamlessly transit between drum male structure 9 and the kuppe 6, by bulging male structure 9 is set, can further upset the flue gas fluidised form, can improve the effect of kuppe 6 vaporization coolings, increase Steam Recovery.
The heat exchange letter road 1 of present embodiment adopts structure shown in Figure 3, be both to be provided with hierarchic structure 7 on the heat exchange letter road 1, be provided with bulging male structure 9 again, by hierarchic structure 7 is set, because the effect of step therein and the vibration effect 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 letter road 1 cross section, flue gas under the independent effect of hierarchic structure or with the acting in conjunction of drum male structure under also the fluidised form disorder can take place, and then improve the heat exchange efficiency of flue gas and steel scrap material.Preferably, the cascaded surface of feeding groove 5 and sealing plate are for adopting rigidly connected integral structure and do the level of synchronization vibration under the effect of driving force, to the electric furnace feeding, namely be rigidly connected between sealing plate 8 and two cascaded surfaces, further improve security and the reliability of equipment.
Preferably, hierarchic structure 7 and drum male structure 9 corresponding setting one by one, and bulging male structure 9 correspondences are arranged on hierarchic structure 7 towards a side of electric furnace, adopt the abrupt change of cross-section structure of this structure, the flue gas that makes the fluidised form disorder just with local gas permeability preferably the steel scrap material meet, improve heat exchange efficiency.
Further, feeding groove 5 is provided with two-stage hierarchic structure at least, and the difference in height of each grade hierarchic structure 7 is 1/3～4 times of the steel scrap average dimension, spacing distance between the adjacent two-stage hierarchic structure 7 is 2～20 times of steel scrap average dimension, each piece steel scrap maximum length sum in the steel scrap of steel scrap average dimension=totally be transferred/totally be transferred steel scrap total block data of steel scrap.Experiment shows that the height of hierarchic structure 7 is important parameters, influences the degree that the steel scrap material is loosened, and when the discrepancy in elevation was big, the steel scrap of whereabouts rolled easily simultaneously, makes steel scrap change heat exchange interface, improves heat exchange efficiency; Length between adjacent two hierarchic structures 7 must have enough spaces, makes the steel scrap material to stop free landing when arriving next hierarchic structure, and controlled operation under extraneous horizontal vibration driving force.The difference in height of the hierarchic structure 7 of present embodiment is 1 times of steel scrap average dimension, and the spacing distance between the adjacent two-stage hierarchic structure 7 is 10 times of steel scrap average dimension.
Further, the bottom land of the feeding groove 5 between the adjacent two-stage hierarchic structure 7 is and is horizontally disposed with or is obliquely installed; Bending part rounding between the bottom land of hierarchic structure 7 and feeding groove 5 or chamfering or be provided with the transition inclined plane, the bottom land of the feeding groove 5 between the adjacent two-stage hierarchic structure 7 of present embodiment is and is horizontally disposed with, bending part between the bottom land of three hierarchic structure 7 and feeding groove 5 is rounding, chamfering and the transition inclined plane is set respectively, as shown in Figure 3, can reduce wearing and tearing, certainly, also can all adopt rounding or chamfering between the bottom land of hierarchic structure 7 and feeding groove 5 or the transition inclined plane is set, be not repeated.
Further, be equipped with the gasification cooling system for waste heat recovery in kuppe 7 and the drum male structure 9, namely kuppe 7 and drum male structure 9 are the gasification cooling-part.
Further, correspondingly with hierarchic structure 7 on the kuppe 6 be provided with at least two bulging male structure 9, be provided with air conduit 10 or burner between the adjacent two drum male structure 9, namely form cavity volume between adjacent two bulging male structure 9, be provided with air conduit 10 between the adjacent two drum male structure 9 of present embodiment.The hierarchic structure 7 of present embodiment is provided with 3, and drum male structure 9 and hierarchic structure 7 are corresponding to be set to 3.
The electric arc furnaces ladder disturbance letter road scrap preheater of present embodiment, by be provided for upsetting the abrupt change of cross-section structure of steel scrap material fluidised form and flue gas fluidised form in heat exchange letter road 1, can effectively improve the heat exchange efficiency between steel scrap material and the flue gas, the reasons are as follows:
The heat exchange principle shows, carries out the medium of heat exchange, gas especially, and flow velocity and turbulence level state have determined the heat exchange efficiency between medium, therefore, can destroy the method for gas steady flow and just can improve heat exchange well; To the steel scrap material and the flue gas that flow relatively in same heat exchange letter road, the motion fluidised form of local failure steel scrap material and the motion fluidised form of flue gas just can be improved both exposure levels, improve heat exchange efficiency;
Therefore, the electric arc furnaces ladder disturbance letter road scrap preheater of present embodiment can not change under the prerequisite of heat-exchanger rig macrostructure substantially, destroys the flow field of heat transferring medium, improves the effect of steel scrap preheating.
Elaborate below in conjunction with the specific embodiment of above-mentioned electric arc furnaces ladder disturbance letter road scrap preheater to electric arc furnaces ladder disturbance letter road steel scrap pre-heating mean.
Adopt the electric arc furnaces ladder disturbance letter road steel scrap pre-heating mean of the electric arc furnaces ladder disturbance letter road scrap preheater of present embodiment, utilize reinforced sealing device 4 to add the steel scrap material to feeding groove 5, under the acting in conjunction of the abrupt change of cross-section structure in heat exchange letter road 1 and horizontal vibration, upset the fluidised form of steel scrap material, make the steel scrap material 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 the steel scrap material conveying process, utilization is arranged on the hierarchic structure 7 on the feeding groove 5, under the drop effect of hierarchic structure 7 and under the vibration effect 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 letter road 1 cross section, flue gas under the independent effect of hierarchic structure or with the acting in conjunction of drum male structure 9 under also the fluidised form disorder can take place, and then improve the heat exchange efficiency of flue gas and steel scrap material.
Therefore, the electric arc furnaces ladder disturbance letter road steel scrap pre-heating mean of present embodiment, be skillfully constructed, improved heat exchange efficiency with simple and reliable structure, and the member that does not have relative motion between flue gas and the steel scrap material parts in contact is so the equipment dependability height is easy to manufacturing and maintenance, when improving heat exchange efficiency, also have advantage simple in structure, as to make easy maintenance, have promotional value.
Explanation is at last, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can make various changes to it in the form and details, and not depart from claims of the present invention institute restricted portion.
Claims (9)
1. electric arc furnaces ladder disturbance letter road scrap preheater, it is characterized in that: comprise being and tilt to install and for delivery of the heat exchange letter road of steel scrap material, the low side in described heat exchange letter road links to each other with electric furnace, high side links to each other with reinforced sealing device with collection fume and dust pipe respectively, described heat exchange letter road comprises for feeding groove from the steel scrap material to electric furnace that carry and lid and is contained on the feeding groove and is used for the kuppe of flue gas water conservancy diversion, and described heat exchange letter road is provided with the abrupt change of cross-section structure that at least one is used for upsetting steel scrap material fluidised form and flue gas fluidised form at its length bearing of trend.
2. electric arc furnaces ladder disturbance letter according to claim 1 road scrap preheater, it is characterized in that: described abrupt change of cross-section structure comprises and is arranged on the described feeding groove hierarchic structure that is used for upsetting steel scrap material fluidised form, and is provided with sealing plate between two cascaded surfaces of described hierarchic structure.
3. electric arc furnaces ladder disturbance letter according to claim 2 road scrap preheater, it is characterized in that: described abrupt change of cross-section structure comprises also and is arranged on the described kuppe the bulging male structure that is used for upsetting the flue gas fluidised form that described bulging male structure is provided with the protuberance towards described feeding groove bottom land projection.
4. electric arc furnaces ladder disturbance letter according to claim 3 road scrap preheater, it is characterized in that: the cascaded surface of described feeding groove and sealing plate are for adopting rigidly connected integral structure and do the level of synchronization vibration under the effect of driving force.
5. according to claim 3 or 4 described electric arc furnaces ladder disturbance letter road scrap preheaters, it is characterized in that: described hierarchic structure and the corresponding setting one by one of described bulging male structure, and described bulging male structure correspondence is arranged on described hierarchic structure towards a side of electric furnace.
6. electric arc furnaces ladder disturbance letter according to claim 5 road scrap preheater, it is characterized in that: described feeding groove is provided with two-stage hierarchic structure at least, and the difference in height of the described hierarchic structure of each grade is 1/3～4 times of the steel scrap average dimension, spacing distance between the adjacent two-stage hierarchic structure is 2～20 times of steel scrap average dimension, each piece steel scrap maximum length sum in the steel scrap of described steel scrap average dimension=totally be transferred/totally be transferred steel scrap total block data of steel scrap.
7. electric arc furnaces ladder disturbance letter according to claim 6 road scrap preheater is characterized in that: the bottom land of the feeding groove between the adjacent two-stage hierarchic structure is and is horizontally disposed with or is obliquely installed; Bending part rounding between the bottom land of described hierarchic structure and feeding groove or chamfering or be provided with the transition inclined plane.
8. according to claim 3 or 4 described electric arc furnaces ladder disturbance letter road scrap preheaters, it is characterized in that: be equipped with the gasification cooling system for waste heat recovery in described kuppe and the drum male structure.
9. according to claim 3 or 4 described electric arc furnaces ladder disturbance letter road scrap preheaters, it is characterized in that: correspondingly with described hierarchic structure on the described kuppe be provided with at least two bulging male structure, be provided with air conduit or burner between the adjacent two drum male structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320190797 CN203231651U (en) | 2013-04-16 | 2013-04-16 | Step disturbance channel waste steel preheating device for electric-arc furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320190797 CN203231651U (en) | 2013-04-16 | 2013-04-16 | Step disturbance channel waste steel preheating device for electric-arc furnace |
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| CN203231651U true CN203231651U (en) | 2013-10-09 |
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| CN 201320190797 Expired - Fee Related CN203231651U (en) | 2013-04-16 | 2013-04-16 | Step disturbance channel waste steel preheating device for electric-arc furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196296A (en) * | 2013-04-16 | 2013-07-10 | 中冶赛迪工程技术股份有限公司 | Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert |
| CN103822489A (en) * | 2014-03-21 | 2014-05-28 | 张昌剑 | Waste-steel continuous preheating method and waste-steel continuous preheating device |
| CN105627733A (en) * | 2016-02-29 | 2016-06-01 | 中冶赛迪工程技术股份有限公司 | Electric-arc furnace shock-resistant baffling charging steel scrap preheating chamber-dedusting structure |
| CN107504820A (en) * | 2017-08-22 | 2017-12-22 | 江苏兴辉炉业科技有限公司 | Preheating furnace |
| WO2022134899A1 (en) * | 2020-12-24 | 2022-06-30 | 中冶赛迪工程技术股份有限公司 | Side wall flow guiding and preheating trough, continuous feeding and preheating device comprising same, and preheating method thereof |
-
2013
- 2013-04-16 CN CN 201320190797 patent/CN203231651U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196296A (en) * | 2013-04-16 | 2013-07-10 | 中冶赛迪工程技术股份有限公司 | Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert |
| CN103196296B (en) * | 2013-04-16 | 2015-07-15 | 中冶赛迪工程技术股份有限公司 | Steel scrap preheater and preheating method of electric-arc furnace step disturbance culvert |
| CN103822489A (en) * | 2014-03-21 | 2014-05-28 | 张昌剑 | Waste-steel continuous preheating method and waste-steel continuous preheating device |
| CN103822489B (en) * | 2014-03-21 | 2015-07-01 | 张昌剑 | Waste-steel continuous preheating method and waste-steel continuous preheating device |
| CN105627733A (en) * | 2016-02-29 | 2016-06-01 | 中冶赛迪工程技术股份有限公司 | Electric-arc furnace shock-resistant baffling charging steel scrap preheating chamber-dedusting structure |
| CN107504820A (en) * | 2017-08-22 | 2017-12-22 | 江苏兴辉炉业科技有限公司 | Preheating furnace |
| WO2022134899A1 (en) * | 2020-12-24 | 2022-06-30 | 中冶赛迪工程技术股份有限公司 | Side wall flow guiding and preheating trough, continuous feeding and preheating device comprising same, and preheating method thereof |
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