The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Zhengjian Liu - One of the best experts on this subject based on the ideXlab platform.
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Existence state and structures of extracted coke and accompanied samples from tuyere zone of a large-scale blast furnace
Fuel, 2018Co-Authors: Jianliang Zhang, Jianbo Zhong, Minmin Sun, Chunhe Jiang, Ziming Wang, Zhengjian LiuAbstract:Abstract An in-depth understanding about the existence state and structure of materials in the high-temperature zone of a blast furnace is critical to optimize both the ironmaking blast furnace and many other metallurgical processes based on carbothermic reduction. In the present study, coke as well as other accompanied samples (slag, metal and fines) were extracted from an industrial large-scale blast furnace (BF) tuyere zone and were comprehensively characterized to evaluate their existence state and structure. It was found that the weight percentage of slag and metal in the total extracted samples increases first and then keeps at a relative stable level, while the average coke particle size decreases firstly and then keeps at a relatively small size when the position is closer to the blast furnace center. This indicates that smelting and separation of slag and iron as well as the main coke degradation process occur mainly in the center part of BF, and the state in the region (deadman) is relatively stable with similar permeability. Tuyere cokes with various sizes are all extensively reacted with highly developed pores. Due to the improvement of coke pore size, blast furnace melts (bosh slag or molten coke/coal ash) can migrate into the coke matrix through those connected open pores. Coke carrying slag in its inner pores may enter the iron bath of the BF Hearth, which might affect coke dissolution into hot metal and degrade the refractory of the Hearth Bottom. Alkalis content increase significantly when the distance to the tuyere entrance increases, indicating the alkali vapors are mainly recycled and enriched in the center part of blast furnace. The graphitization of coke in the high temperature zone start from the coke surface and the graphitization process may lead to the formation of coke fines.
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Graphitization of Coke and Its Interaction with Slag in the Hearth of a Blast Furnace
Metallurgical and Materials Transactions B, 2016Co-Authors: Jianliang Zhang, Yanxiang Liu, Mansoor Barati, Zhengjian Liu, Jianbo Zhong, Mengfang Wei, Guangwei Wang, Tianjun YangAbstract:Coke reaction behavior in the blast furnace Hearth has yet to be fully understood due to limited access to the high temperature zone. The graphitization of coke and its interaction with slag in the Hearth of blast furnace were investigated with samples obtained from the center of the deadman of a blast furnace during its overhaul period. All Hearth coke samples from fines to lumps were confirmed to be highly graphitized, and the graphitization of coke in the high temperature zone was convinced to start from the coke surface and lead to the formation of coke fines. It will be essential to perform further comprehensive investigations on graphite formation and its evolution in a coke as well as its multi-effect on blast furnace performance. The porous Hearth cokes were found to be filled up with final slag. Further research is required about the capability of coke to fill final slag and the attack of final slag on the Hearth Bottom refractories since this might be a new degradation mechanism of refractories located in the Hearth Bottom.
Cheng Shu-sen - One of the best experts on this subject based on the ideXlab platform.
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Design of Lower Shaft and Hearth Bottom for Long Campaign Blast Furnace
Journal of Iron and Steel Research, 2004Co-Authors: Cheng Shu-senAbstract:A model for calculating the temperature distribution of the stave and the Hearth Bottom and a mathematical model of temperature distribution of lower shaft cooler and Hearth Bottom of blast furnace were built. The computational software of the temperature field was developed by using C++ language in VC++ integrated environment. The calculation results show that the formation of the protection shell can be achieved by optimizing the parameters for designing the stave and the Hearth Bottom. The software has been used to design blast furnace of some large companies in China.
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Mathematical Model and Numerical Simulation of Temperature Field for Hearth and Hearth Bottom of Long Campaign Blast Furnace
Journal of Iron and Steel Research, 2004Co-Authors: Cheng Shu-senAbstract:The Hearth and Hearth Bottom life of blast furnace is one of the key factors affecting blast furnace life. In order to make the Hearth and Hearth Bottom have the same life-span as that of blast furnace, one of effective measures is to form a layer of slag-metal skull on the Hearth and Hearth Bottom. In order to form a layer of slag-metal skull, the 1 150 ℃ isothermal line should be moved off the hot surface of the Hearth and Hearth Bottom during designing blast furnace. Therefore, it is necessary to compute the temperature field of the Hearth and Hearth Bottom. So some usual mathematical models of the temperature field for the Hearth and Hearth Bottom of blast furnace were discussed. The calculating software of the temperature field of the Hearth and Hearth Bottom was developed.
Jianliang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Existence state and structures of extracted coke and accompanied samples from tuyere zone of a large-scale blast furnace
Fuel, 2018Co-Authors: Jianliang Zhang, Jianbo Zhong, Minmin Sun, Chunhe Jiang, Ziming Wang, Zhengjian LiuAbstract:Abstract An in-depth understanding about the existence state and structure of materials in the high-temperature zone of a blast furnace is critical to optimize both the ironmaking blast furnace and many other metallurgical processes based on carbothermic reduction. In the present study, coke as well as other accompanied samples (slag, metal and fines) were extracted from an industrial large-scale blast furnace (BF) tuyere zone and were comprehensively characterized to evaluate their existence state and structure. It was found that the weight percentage of slag and metal in the total extracted samples increases first and then keeps at a relative stable level, while the average coke particle size decreases firstly and then keeps at a relatively small size when the position is closer to the blast furnace center. This indicates that smelting and separation of slag and iron as well as the main coke degradation process occur mainly in the center part of BF, and the state in the region (deadman) is relatively stable with similar permeability. Tuyere cokes with various sizes are all extensively reacted with highly developed pores. Due to the improvement of coke pore size, blast furnace melts (bosh slag or molten coke/coal ash) can migrate into the coke matrix through those connected open pores. Coke carrying slag in its inner pores may enter the iron bath of the BF Hearth, which might affect coke dissolution into hot metal and degrade the refractory of the Hearth Bottom. Alkalis content increase significantly when the distance to the tuyere entrance increases, indicating the alkali vapors are mainly recycled and enriched in the center part of blast furnace. The graphitization of coke in the high temperature zone start from the coke surface and the graphitization process may lead to the formation of coke fines.
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Graphitization of Coke and Its Interaction with Slag in the Hearth of a Blast Furnace
Metallurgical and Materials Transactions B, 2016Co-Authors: Jianliang Zhang, Yanxiang Liu, Mansoor Barati, Zhengjian Liu, Jianbo Zhong, Mengfang Wei, Guangwei Wang, Tianjun YangAbstract:Coke reaction behavior in the blast furnace Hearth has yet to be fully understood due to limited access to the high temperature zone. The graphitization of coke and its interaction with slag in the Hearth of blast furnace were investigated with samples obtained from the center of the deadman of a blast furnace during its overhaul period. All Hearth coke samples from fines to lumps were confirmed to be highly graphitized, and the graphitization of coke in the high temperature zone was convinced to start from the coke surface and lead to the formation of coke fines. It will be essential to perform further comprehensive investigations on graphite formation and its evolution in a coke as well as its multi-effect on blast furnace performance. The porous Hearth cokes were found to be filled up with final slag. Further research is required about the capability of coke to fill final slag and the attack of final slag on the Hearth Bottom refractories since this might be a new degradation mechanism of refractories located in the Hearth Bottom.
Jianbo Zhong - One of the best experts on this subject based on the ideXlab platform.
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Existence state and structures of extracted coke and accompanied samples from tuyere zone of a large-scale blast furnace
Fuel, 2018Co-Authors: Jianliang Zhang, Jianbo Zhong, Minmin Sun, Chunhe Jiang, Ziming Wang, Zhengjian LiuAbstract:Abstract An in-depth understanding about the existence state and structure of materials in the high-temperature zone of a blast furnace is critical to optimize both the ironmaking blast furnace and many other metallurgical processes based on carbothermic reduction. In the present study, coke as well as other accompanied samples (slag, metal and fines) were extracted from an industrial large-scale blast furnace (BF) tuyere zone and were comprehensively characterized to evaluate their existence state and structure. It was found that the weight percentage of slag and metal in the total extracted samples increases first and then keeps at a relative stable level, while the average coke particle size decreases firstly and then keeps at a relatively small size when the position is closer to the blast furnace center. This indicates that smelting and separation of slag and iron as well as the main coke degradation process occur mainly in the center part of BF, and the state in the region (deadman) is relatively stable with similar permeability. Tuyere cokes with various sizes are all extensively reacted with highly developed pores. Due to the improvement of coke pore size, blast furnace melts (bosh slag or molten coke/coal ash) can migrate into the coke matrix through those connected open pores. Coke carrying slag in its inner pores may enter the iron bath of the BF Hearth, which might affect coke dissolution into hot metal and degrade the refractory of the Hearth Bottom. Alkalis content increase significantly when the distance to the tuyere entrance increases, indicating the alkali vapors are mainly recycled and enriched in the center part of blast furnace. The graphitization of coke in the high temperature zone start from the coke surface and the graphitization process may lead to the formation of coke fines.
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Graphitization of Coke and Its Interaction with Slag in the Hearth of a Blast Furnace
Metallurgical and Materials Transactions B, 2016Co-Authors: Jianliang Zhang, Yanxiang Liu, Mansoor Barati, Zhengjian Liu, Jianbo Zhong, Mengfang Wei, Guangwei Wang, Tianjun YangAbstract:Coke reaction behavior in the blast furnace Hearth has yet to be fully understood due to limited access to the high temperature zone. The graphitization of coke and its interaction with slag in the Hearth of blast furnace were investigated with samples obtained from the center of the deadman of a blast furnace during its overhaul period. All Hearth coke samples from fines to lumps were confirmed to be highly graphitized, and the graphitization of coke in the high temperature zone was convinced to start from the coke surface and lead to the formation of coke fines. It will be essential to perform further comprehensive investigations on graphite formation and its evolution in a coke as well as its multi-effect on blast furnace performance. The porous Hearth cokes were found to be filled up with final slag. Further research is required about the capability of coke to fill final slag and the attack of final slag on the Hearth Bottom refractories since this might be a new degradation mechanism of refractories located in the Hearth Bottom.
Henrik Saxén - One of the best experts on this subject based on the ideXlab platform.
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numerical prediction of iron flow and Bottom erosion in the blast furnace Hearth
Steel Research International, 2012Co-Authors: Lei Shao, Henrik SaxénAbstract:The blast furnace (BF) campaign life, which is limited by the Hearth erosion, will be decisive for the process to maintain its dominance in ore-based iron production, so timely prediction of the Hearth erosion and proper measures to protect the Hearth are important issues. The erosion at the Hearth Bottom has not received much attention, even though the region is believed to be the most vulnerable part of the Hearth. A computational fluid dynamic (CFD) model has been developed to deepen the understanding of iron flow and refractory erosion at the Bottom of the Hearth. Key boundary and internal conditions, such as slag–iron interface and dead man state, are provided by a BF drainage model which reproduces the tapping process. Simulations with the CFD model illustrate how different factors affect the flow pattern, Hearth erosion profile, and Bottom breakage ratio. It is shown that the dead man state plays an important role for the flow behavior and erosion conditions in the Hearth. The model is demonstrated to predict two erosion types that are commonly encountered in practice.
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Model of the state of the blast furnace Hearth
ISIJ International, 2000Co-Authors: J. Torrkulla, Henrik SaxénAbstract:A model for estimation of erosion and skull profiles of the blast furnace Hearth is presented. The model, which is based on thermocouple measurements in the Hearth Bottom and wall lining, estimates the most severe erosion of the lining experienced during the campaign and also the present thickness of the skull material. The model is illustrated on process data from two Finnish blast furnaces. Complementary measurements and calculations are used to verify the results. Based on the findings, conclusions are drawn about the internal state of the blast furnace Hearth, for instance, whether the dead man floats or sits at the Bottom. Finally, some suggestions on how to control the state of the furnace Hearth are given.
