Because of the low temperature, large waste gas volume, high pollutant content, and complicated compositions, waste heat recovery and emission gas treatment of sintering flue gas have always presented a challenge in t...Because of the low temperature, large waste gas volume, high pollutant content, and complicated compositions, waste heat recovery and emission gas treatment of sintering flue gas have always presented a challenge in the steel industry, and this issue has attracted widespread attention both locally and abroad. Recently, based on the first domestic pilot plant and demonstration project, Baosteel has performed a series of innovative research and development investigations on its sintering flue gas recirculating （SFGR） process,in which the system design and optimization, dioxin-related contaminant source suppression, ore matching structure optimization, wear- resistant design of cycling fans and pipelines, high-efficiency dust removal equipment, system control and stable operation strategy, flue gas mixing and switching control, circular hood sealing, oxygen content conditioning, recirculation sintering system process control, and model development have been studied, and a complete set of equipment and technology for the SFGR process has been initially developed. The investigation results suggest that the SFGR process can not only significantly reduce exhaust gas volume and pollutant emissions but also recover low-temperature waste heat and reduce the energy consumption of sintering; therefore, the overall technologies possess great value in energy savings ,pollution emission reduction, and sintering ore quality/yield improvement.展开更多
This paper is an extension of the application of neighborhood interference model--being modified--to the study of the interference between forest plants and herbaceous plants. The exploration of the neighborhood inter...This paper is an extension of the application of neighborhood interference model--being modified--to the study of the interference between forest plants and herbaceous plants. The exploration of the neighborhood interference between triploid Populus tomentosa and Lolium multiflorum shows that the interference of Lolium multiflorum on triploid populus tomentosa is positive, with the primary interference factor living weight, and secondary factor cover degree; the growth of an individual tree is affected by the number, height, and coverage of the Lolium multiflorum; the more dense the coverage of the Lolium multiflorum in a certain area, the taller, faster and more trees will grow as a result of a greater positive neighborhood interference. The modified neighborhood interference model well serves as an effective approach to extend the application of neighborhood interference researches.展开更多
The charging pattern may affect blast furnace permeability, coke ratio, and the freedom to select lowgrade raw materials. Ore-coke mixed charging is a potential technique for optimizing the charging pattern. In recent...The charging pattern may affect blast furnace permeability, coke ratio, and the freedom to select lowgrade raw materials. Ore-coke mixed charging is a potential technique for optimizing the charging pattern. In recent years,charging small-sized coke （nut coke） into the burden layer has been applied to save raw materials and decrease cost. Although mixed charging, especially adding nut coke into the burden layer, may have many advantages, the mechanisms and side effects of nut coke use are not well understood, and the mixing ratio is still limited in industrial blast furnace operation. In this study ,the status of mixed charging, especially nut coke used in blast furnaces, was investigated. A cold flow model was established to study the permeability of the packed bed in the blast furnace ＂dry zone＂ under different conditions with the aim of better understanding the mechanisms of mixing coke and nut coke into the burden layer. The effect of coke size, mixing coke ratio, layer numbers, and gas flow rate on the pressure drop of the packed bed was investigated. The experimental results show that mixing the nut coke in the ore layers decreases the pressure drop to different extents depending on mixing ratio.展开更多
文摘Because of the low temperature, large waste gas volume, high pollutant content, and complicated compositions, waste heat recovery and emission gas treatment of sintering flue gas have always presented a challenge in the steel industry, and this issue has attracted widespread attention both locally and abroad. Recently, based on the first domestic pilot plant and demonstration project, Baosteel has performed a series of innovative research and development investigations on its sintering flue gas recirculating （SFGR） process,in which the system design and optimization, dioxin-related contaminant source suppression, ore matching structure optimization, wear- resistant design of cycling fans and pipelines, high-efficiency dust removal equipment, system control and stable operation strategy, flue gas mixing and switching control, circular hood sealing, oxygen content conditioning, recirculation sintering system process control, and model development have been studied, and a complete set of equipment and technology for the SFGR process has been initially developed. The investigation results suggest that the SFGR process can not only significantly reduce exhaust gas volume and pollutant emissions but also recover low-temperature waste heat and reduce the energy consumption of sintering; therefore, the overall technologies possess great value in energy savings ,pollution emission reduction, and sintering ore quality/yield improvement.
基金the Western Action Project of Chinese Academy of Sciences(KZCX2-XB2-07)the Item of State Council Three Gorges Project Construction Committee Executive Office (SX2001-021)Youth Seed Fund Item of Chinese Academy of Sciences (1100001079)
文摘This paper is an extension of the application of neighborhood interference model--being modified--to the study of the interference between forest plants and herbaceous plants. The exploration of the neighborhood interference between triploid Populus tomentosa and Lolium multiflorum shows that the interference of Lolium multiflorum on triploid populus tomentosa is positive, with the primary interference factor living weight, and secondary factor cover degree; the growth of an individual tree is affected by the number, height, and coverage of the Lolium multiflorum; the more dense the coverage of the Lolium multiflorum in a certain area, the taller, faster and more trees will grow as a result of a greater positive neighborhood interference. The modified neighborhood interference model well serves as an effective approach to extend the application of neighborhood interference researches.
基金carried out at Delft University of Technology with the financial support of M2i(Materials Innovation Institute)under the project number M41.5.09326
文摘The charging pattern may affect blast furnace permeability, coke ratio, and the freedom to select lowgrade raw materials. Ore-coke mixed charging is a potential technique for optimizing the charging pattern. In recent years,charging small-sized coke （nut coke） into the burden layer has been applied to save raw materials and decrease cost. Although mixed charging, especially adding nut coke into the burden layer, may have many advantages, the mechanisms and side effects of nut coke use are not well understood, and the mixing ratio is still limited in industrial blast furnace operation. In this study ,the status of mixed charging, especially nut coke used in blast furnaces, was investigated. A cold flow model was established to study the permeability of the packed bed in the blast furnace ＂dry zone＂ under different conditions with the aim of better understanding the mechanisms of mixing coke and nut coke into the burden layer. The effect of coke size, mixing coke ratio, layer numbers, and gas flow rate on the pressure drop of the packed bed was investigated. The experimental results show that mixing the nut coke in the ore layers decreases the pressure drop to different extents depending on mixing ratio.
