Kato K.,Nippon Steel and Sumikin Engineering Co. |
Suzuki Y.,Nippon Steel & Sumitomo Metal Corporation
Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy | Year: 2013
Coal is very important resource for producing high quality metallurgical coke. In Japan, improvement of coke quality is strongly demanded to operate large inner volume blast furnaces smoothly. So, effective coal utilization technologies involving new cokemaking process were developed for a long period. Research themes are mainly focused on the expansion of coal resources useable for cokemaking, improving coke productivity and reducing energy consumption. Especially improvement of coke quality is very important, because it generally leads to increase the blending ratio of low grade coals in coal charge without deteriorating coke strength. In this paper, new cokemaking technologies such as DAPS process and SCOPE21 process are introduced. Understanding of these processes is expected to contribute to further innovative development of new cokemaking process.
Ene D.,Tokyo Institute of Technology |
Yamada S.,Tokyo Institute of Technology |
Jiao Y.,Tokyo University of Science |
Kishiki S.,Tokyo Institute of Technology |
Konishi Y.,Nippon Steel and Sumikin Engineering Co.
Earthquake Engineering and Structural Dynamics | Year: 2016
A reliable performance of anti-seismic devices when the upper-structure is subjected to strong biaxial seismic excitation is of vital importance to ensure the latter doesn't reach critical behavior. U-shaped steel dampers are hysteretic devices used to dissipate the earthquake-induced energy of base-isolated structures. In the framework of performance-based design, which is gaining more and more recognition, it is of particular importance to assess the performance of base-isolated structures with such dampers under different intensity levels of bidirectional ground motion. To achieve this goal, an analytical model able to simulate the bidirectional displacement response of an isolation system is adopted. Incremental dynamic analysis (IDA) is used to obtain the relation between the earthquake-induced bidirectional damage of U-shaped steel dampers and different intensity levels of the considered records. The performance of the dampers is categorized into 5 levels delimited by 4 limit states for which fragility curves are derived. The results obtained using the bidirectional approach are quantitatively compared to those given by employing an in-plane model (widely used in current design practices in Japan) with the purpose of assessing whether the latter provides unconservative estimates of the performance of the dampers. The main conclusion is that, for large seismic intensities, the safety margin against fracture of the dampers is significantly overestimated when an in-plane model is adopted. © 2016 John Wiley & Sons, Ltd.
Hikino T.,Nippon Steel and Sumikin Engineering Co. |
Okazaki T.,Hokkaido University |
Kajiwara K.,Hyogo Earthquake Engineering Research Center |
Nakashima M.,Kyoto University
Journal of Structural Engineering (United States) | Year: 2013
Abstract Large-scale shake table tests were performed at E-Defense to examine the out-of-plane stability of buckling-restrained braces (BRBs). Two specimens were subjected repeatedly to a near-fault ground motion with increasing amplification. The test specimens comprised a single-bay, single-story steel frame and a pair of BRBs placed in a chevron arrangement. The specimens were not braced at the brace-to-beam intersection in order to produce a condition where the BRBs were susceptible to out-of-plane instability. Standard BRBs were used in the first specimen, while BRBs with a flexible segment at each end of the steel core were used in the second specimen. A simple stability model predicted the BRBs in the second specimen to fail because of out-of-plane buckling. The first specimen exhibited excellent ductility during the shake table tests, while the second specimen developed severe out-of-plane deformation that compromised the ductility of the BRBs. Based on the experimental observations and the stability model, a methodology is proposed to evaluate bracing requirements at the brace-to-beam intersection. © 2013 American Society of Civil Engineers.
Hayashi M.,Nippon Steel and Sumikin Engineering Co. |
Mimura T.,Nippon Steel and Sumikin Engineering Co.
Energy Procedia | Year: 2013
The most efficient energy cut-off chemical absorption process has been developed in the project of COURSE50 (CO2 Ultimate Reduction in Steelmaking process by innovative technology for cool Earth 50). Through each long hours running by the use of several kinds of newly developed absorbents, high energy saving, utilization of far lower temperature , and extremely low influence of the process to steel making facilities downstream of the process have been tested and verified using of actual blast furnace gas in the steel works. © 2013 The Author.
Jarwali T.,Tokai University |
Nakamura S.,Tokai University |
Suzumura K.,Nippon Steel and Sumikin Engineering Co.
Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management - Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 | Year: 2015
The strands consisting of 19 parallel steel wires galvanized with Al (10%) and Zn (90%) alloy are produced and corrosion acceleration tests have been conducted and the anti-corrosion performance is compared with the conventional strands galvanized with Zn. The strands are kept under three different corrosion environments: kept at a relative humidity (RH) of 60%, kept at a RH of 100%, and wrapped with wet gauze which simulates the wet condition. The strands are kept in the thermo-hygrostat at 40oC for 150 days. The mass loss due to corrosion of the strands galvanized with Zn-Al under the relative humidity of 60% and 100% is small and the strands have sufficient corrosion resistance. Under the wet condition, the corroded mass of the strands galvanized with Zn-Al is 15 times larger than that under the relative humidity of 100%. The strands galvanized with Zn-Al have smaller corrosion and longer life than those galvanized with Zn under the three environmental conditions. Corroded mass is larger in the surface wire, the inside wire and the center wire in this order. The cross section of corroded strands are investigated by an optical microscope and EPMA analysis showing that the corrosion product of Zn is loose and easy to exfoliate from the steel layer. On the contrary, the corrosion product of Zn-Al alloy is dense and hard to exfoliate from the steel layer. This difference is the reason of the superiority of the Zn-Al galvanized wires. © 2015 Taylor & Francis Group, London.
Tanigaki N.,Nippon Steel And Sumikin Engineering Co. |
Ishida Y.,Nippon Steel and Sumikin Engineering Co. |
Osada M.,Nippon Steel And Sumikin Engineering Co.
Waste Management | Year: 2015
This study evaluates municipal solid waste co-gasification technology and a new solid waste management scheme, which can minimize final landfill amounts and maximize material recycled from waste. This new scheme is considered for a region where bottom ash and incombustibles are landfilled or not allowed to be recycled due to their toxic heavy metal concentration. Waste is processed with incombustible residues and an incineration bottom ash discharged from existent conventional incinerators, using a gasification and melting technology (the Direct Melting System). The inert materials, contained in municipal solid waste, incombustibles and bottom ash, are recycled as slag and metal in this process as well as energy recovery.Based on this new waste management scheme with a co-gasification system, a case study of municipal solid waste co-gasification was evaluated and compared with other technical solutions, such as conventional incineration, incineration with an ash melting facility under certain boundary conditions. From a technical point of view, co-gasification produced high quality slag with few harmful heavy metals, which was recycled completely without requiring any further post-treatment such as aging. As a consequence, the co-gasification system had an economical advantage over other systems because of its material recovery and minimization of the final landfill amount.Sensitivity analyses of landfill cost, power price and inert materials in waste were also conducted. The higher the landfill costs, the greater the advantage of the co-gasification system has. The co-gasification was beneficial for landfill cost in the range of 80 Euro per ton or more. Higher power prices led to lower operation cost in each case. The inert contents in processed waste had a significant influence on the operating cost.These results indicate that co-gasification of bottom ash and incombustibles with municipal solid waste contributes to minimizing the final landfill amount and has great possibilities maximizing material recovery and energy recovery from waste. © 2014 Elsevier Ltd.
Kiuchi T.,Nippon Steel and Sumikin Engineering Co. |
Yoshida M.,Nippon Steel and Sumikin Engineering Co. |
Kato Y.,Nippon Steel and Sumikin Engineering Co.
Journal of the Japan Petroleum Institute | Year: 2015
Bioethanol is a renewable liquid fuel that has become established as a viable alternative to gasoline. Bioethanol is produced mainly in the US and Brazil from corn and sugarcane as feedstock, and world-wide production has been expanding. However, a distillation process is essential for refining bioethanol, which requires a large amount of heat, and thus offsets the carbon-neutral value. The energy efficiency of the distillation process with "Self-heat recuperation" technology was studied, which recovers sensible and latent heats by compressing the vapor from the top of the distillation column. In this study, the effect of energy saving in the distillation of bioethanol with self-heat recuperation technology was analyzed in comparison to the conventional counterpart using a temperature-heat diagram, as well as demonstrated on a pilot scale. Further demonstration tests were conducted for enzyme-recovering distillation that is used in the cellulosic ethanol production process from cellulosic biomass as feedstock to study the effect of energy saving using distillation with self-heat recuperation.
Wada M.,Nippon Steel and Sumikin Engineering Co |
Tokimatsu K.,Tokyo Institute of Technology |
Sawaishi M.,Nippon Steel and Sumikin Engineering Co
Journal of Structural and Construction Engineering | Year: 2016
In order to estimate the effects of cyclic loading on bearing capacity and pull-out resistance of piles, monotonic and cyclic vertical loading tests were conducted on a pile with or without spiral wings in uniformly graded sand in a calibration chamber. Both pushing and pulling shaft friction decreased with increasing the cyclic loading force, whereas the pushing end wing and tip resistance did not decrease with increasing the cyclic loading force.
Akcelyan S.,McGill University |
Lignos D.G.,McGill University |
Hikino T.,Nippon Steel and Sumikin Engineering Co. |
Nakashima M.,Kyoto University
Journal of Structural Engineering (United States) | Year: 2016
This paper summarizes a number of key findings that affect the use of linear and nonlinear analysis procedures for the seismic evaluation of steel frame buildings with supplemental damping devices and in particular, buckling-restrained braces (BRBs) and nonlinear viscous dampers (NVDs). The assessment is based on a comparison of various engineering demand parameters (EDPs) with experimental data obtained from a series of full-scale shaking table tests of a five-story steel building equipped with BRBs and NVDs. It is shown that: (1) there is no clear advantage between three-dimensional (3D) and two-dimensional (2D) analyses in the prediction of the dynamic behavior of regular plan view steel frame buildings regardless of the damper type; (2) incorporating the brace and nonlinear viscous damper axial flexibility in the analytical model of the test structure with NVDs significantly improves the overall numerical predictions; and (3) the current effective damping ratio recommended by ASCE 41-13 as part of linear static procedures for the evaluation of frame buildings with BRBs or NVDs may not be conservative enough. A new performance-based design tool called performance-spectra (P-Spectra) is able to reliably predict the EDPs of interest. The P-Spectra tool is also able to validate the efficiency of various damper solutions on the dynamic performance of the test structure. It is demonstrated that P-Spectra can be employed to predict estimates of potential residual deformations that traditional linear and nonlinear static procedures cannot. © 2016 American Society of Civil Engineers.
Tanigaki N.,Nippon Steel and Sumikin Engineering Co. |
Fujinaga Y.,Nippon Steel and Sumikin Engineering Co. |
Kajiyama H.,Nippon Steel and Sumikin Engineering Co. |
Ishida Y.,Nippon Steel and Sumikin Engineering Co.
Waste Management and Research | Year: 2013
Gasification technologies for waste processing are receiving increased interest. A lot of gasification technologies, including gasification and melting, have been developed in Japan and Europe. However, the flue gas and heavy metal behaviors have not been widely reported, even though those of grate furnaces have been reported. This article reports flue gas components of gasification and melting technology in different flue gas treatment systems. Hydrogen chloride concentrations at the inlet of the bag filter ranged between 171 and 180 mg Nm-3 owing to de-acidification by limestone injection to the gasifier. More than 97.8% of hydrogen chlorides were removed by a bag filter in both of the flue gas treatment systems investigated. Sulfur dioxide concentrations at the inlet of the baghouse were 4.8 mg Nm-3 and 12.7 mg Nm-3, respectively. Nitrogen oxides are highly decomposed by a selective catalytic reduction system. Owing to the low regenerations of polychlorinated dibenzo-p-dioxins and furans, and the selective catalytic reduction system, the concentrations of polychlorinated dibenzo-p-dioxins and furans at the stacks were significantly lower without activated carbon injection. More than 99% of chlorine is distributed in fly ash. Low-boiling-point heavy metals, such as lead and zinc, are distributed in fly ash at rates of 97.6% and 96.5%, respectively. Most high-boiling-point heavy metals, such as iron and copper, are distributed in metal. It is also clarified that the slag is stable and contains few harmful heavy metals, such as lead. The heavy metal distribution behaviors are almost the same regardless of the compositions of the processed waste. These results indicate that the gasification of municipal solid waste constitutes an ideal approach to environmental conservation and resource recycling. © The Author(s) 2013.