توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Modeling and Simulation of Thermal Cracking Reactors Equipped with ceramic rod
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۳
This paper presents results from computer simulations for industrial olefin furnace. The furnaces include a gas fired propylene cracker heater. The systems have been modeled using a CFD–based,combustion flow model, in both cases the empty reactor and reactor equipped with ceramic rod.To simulating model Runge–Kuta method with steady state assumption in which the speed of production and consumption is equal radicals; has been used. Results of the two modes are evaluated by development of mathematical equations, modeling and simulation of the cases. According to the simulation results, outlet gas temperature of reactor with ceramic rod is about 30 degrees higher than the gas temperature in the simple reactor. Although the ceramic rod in the reactor cause increase in pressure drop, it can increase the Product rate to 1.157 times greater thansimple one. The model is validated with industrial – experimental results<\div>

۲Performance Study on Dehumidifier of Packed bed Liquid desiccant System
اطلاعات انتشار: Scientia Iranica، بيست و يكم،شماره۱، ۲۰۱۴، سال
تعداد صفحات: ۷
Liquid desiccant evaporation cooling air conditioning system introduced in this paper. The dehumidifier and regenerator play the most important role in this system. For liquid–gas contact, packed towers with low pressure drop provide good heat and mass transfer characteristics for compact designs.The experimental data have been obtained from a built prototype of liquid desiccant system in a packed bed unit with a surface area per unit volume ratio of 125 m2\m3, the liquid desiccant ,viz lithium chloride. The result showed that the mean mass transfer coefficient of the packing dehumidifier was 0.02kg\ m2s Also the absorber characteristic parameter, the packing size or number of transfer units (NTU), and air–to–desiccant solution mass flow rate ratio (ASMR) are crucial parameters. These parameters are affected to humidity effectiveness and enthalpy efficiency, are introduced and defined in this paper. High efficiency could be achieved if proper values of these variables are selected. In this study enthalpy efficiency from experimental results has been compared with the analytical computation result based on optimum ASMR. From analytical solution, an optimum mass flow rate ratio can be deduced for optimal design of both dehumidifiers and regenerators, but in this studybehavior of the absorberhas been considered.
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