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Showing 3 results for Type of Study: Applicable

Amin Emami Razlighi, Mahsa Asadi, Behnam Nasrollahzadeh,
Volume 1, Issue 1 (4-2019)
Abstract

The rapid advances in human societies over the past decades have resulted in fast development of steel, cement, and other industries. Cement is one of the most important industries which plays a significant role in the development and prosperity of any country and worldwide. On the other hand, cement factories are among the major environmental plights and source of contamination. Accordingly, one of the main issues of these factories is controlling and preventing excessive emission of contaminants. Electrostatic precipitators are among the most important devices for controlling air pollution. One of the most important influential parameters affecting the efficiency of dust collection in the design of the electrostatic precipitator is the migration velocity. In this research, this parameter was studied in the electrostatic precipitators of ELEx, Hamon, and FLSmith companies, which are responsible for collecting the dust from Clinker coolers in cement factories. The results of the research suggested that the range of this parameter under the mentioned conditions was obtained as 8.7-11.5 Also, it can be stated that with elevation of the efficiency of mechanical dust collection of the equipment, one can achieve a better efficiency. This can be realized by properly exploiting chemical engineering, mechanical engineering, electricity engineering, as well as the experiences of scholars, thereby reducing costs, increasing the useful lifetime of equipment, and preventing environmental pollution.
Behnam Nasrollahzadeh, Reza Elyasi,
Volume 1, Issue 1 (4-2019)
Abstract

Producing cement with appropriate quality and by spending the minimum cost, applying solutions including process optimization and use of grinding aid are suggested. This paper compares and investigates the effect of process optimization and use of grinding aid on the operational capacity and blaine of final product in two cement mill departments in a cement plant. The results of a specific grinding aid test and its effect on the quantity and quality of the final product were compared with the results obtained from process optimization of cement mill lines 1 and 2 of a cement plant including optimization of the arrangement and tonnage of the charge of balls. The results suggested that the operational capacity of cement mill of lines 1 and 2 when optimizing the process conditions increased by around 9.4 and 15%, and the blaine of the final product of the department rose by about 4.6 and 4.3% respectively compared to the case of using the grinding aid. It should be noted that performing the grinding aid test in relation to the initial conditions only resulted in enhanced operational capacity of cement mills, and had no significant effect on the parameter of quality (blaine). On the other hand, performing the process optimization had positive effects on both quantity and quality.
Mohammad Reza Tabeshpour, Mohammad Hadi Erfani, Hassan Sayyadi,
Volume 1, Issue 1 (4-2019)
Abstract

The ultimate capacity of offshore structures including jacket type offshore platforms is used to achieve structural performance levels and determine their ductility. Accurate estimation of this parameter is of great importance. Formation of fatigue cracks at the joints, corrosion of members, environmental loads and damages caused by accidental dynamic loads such as impacts of vessels and floating bodies will result in change of the ultimate capacity of these structures over time of their life. These cases should be considered in calculating the ultimate capacity of the offshore platforms at any given time of their life. However, accurate modeling of the global and local buckling of compression members is important at any time of calculating the ultimate capacity. Buckling modes and deformations due to local buckling will be considered, if the compressive braces are modeled by Shell or Solid elements and the imperfections are applied. The purpose of this paper is to achieve the correct compressive behavior of compression members. ABAQUS finite element computer software is used for this purpose. The buckling envelope derives from Marshall Strut theory defines the post-buckling damaged elasticity model and the hysteretic loop response. Finally, by using this modified behavior in Frame elements, the effects of local buckling in compressive braces can be considered.

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پیشرفت ها در مکانیک جامدات و سیالات Advances in Solid and Fluid Mechanics.
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