تحلیل عددی رفتار هیدرودینامیک اختلاط سه فازی پوسته برنج، شن و هوا در بستر سیال حبابی با رفتار دانه‌ای ذرات

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی و مهندسی دانشگاه بین المللی امام خمینی، قزوین، ایران.

چکیده

زیست‌توده به عنوان یک منبع انرژی تجدید‌پذیر در سراسر جهان از اهمیت زیادی برخوردار است. نقش اختلاط و جدایش ذرات زیست‌توده و ماده بستر در فرآیند گازی‌سازی بستر سیال بسیار حائز اهمیت است. هر چه میزان اختلاط این ذرات به خوبی انجام شود، کیفیت گازهای سنتز شده خروجی از فرآیند گازی‌سازی زیست توده افزایش می‌یابد. این پژوهش با استفاده از ابزار دینامیک سیالات محاسباتی به روش حجم محدود با رویکرد جریان چند فازی اویلرین به بررسی فرآیند اختلاط سه فازی پوسته برنج (زیست‌توده)، شن (ماده بستر) و هوا در بستر سیال حبابی می‌پردازد. تاثیر ضریب برخورد بین ذرات و شرایط مرزی دیوار برای فاز جامد در فرآیند اختلاط زیست‌توده و ماده بستر مطالعه شده است. در این پژوهش، تاثیر لغزش آزاد، لغزش جزئی و بدون لغزش برای ذرات در برخورد با دیوار بررسی شده است. در شرایط لغزش جزیی، سرعت ذرات پوسته برنج و شن در مقایسه با دو حالت دیگر بیشتر می‌باشد، لذا هر چه سرعت ذرات در بستر افزایش یابد، اختلاط و توزیع یکنواخت ذرات در بستر افزایش می‌یابد. بررسی افت فشار در بستر سیال نشان می‌دهد، در شرایط لغزش آزاد، افت فشار به ترتیب 09/8 درصد و 2/14درصد نسبت به دو حالت لغزش جزیی و لغزش کلی کمتر می‌باشد. همچنین سه نوع پوسته برنج با ضرایب برخورد متفاوت مطالعه شده است. در نتیجه این مطالعه، با کاهش ضریب برخورد بین ذرات، سرعت ذرات پوسته برنج و شن حدود 9 درصد افزایش یافته و افت فشار حدود 22 درصد کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Analysis of the Hydrodynamic Behavior of Three-Phase Mixing of Rice Husk, Sand and Air in a Bubbling Fluidized Bed with Particle Granular Behavior

نویسندگان [English]

  • Reza Karimi Ahmadi
  • HamidReza Nazif
Mechanical Engineering, Faculty of Technical & Engineering, Imam Khomeini International University, Qazvin, Iran.
چکیده [English]

Biomass is important as a renewable source of energy worldwide. The role of mixing and segregation of particles in the process of gasification of the fluidized bed is important. better mixing of these particles the better the quality of synthesized gases emitted from biomass gasification process. This study investigates the three-phase mixing process of rice husk (biomass), sand (bed material) and air in a bubbling fluidized bed using the finite volume and computational fluid dynamics tool with Eulerian multiphase flow approach. effect of the restitution coefficient between the particles and the wall boundary conditions for the solid phase in the process of mixing biomass and bed material has been studied. In this study, the effect of free slip, partial slip and no-slip for particles in contact with the wall has been investigated. In the case of partial slip the velocity of rice husk and sand higher than other two cases. Therefore, as the velocity of particles in the bed increases, the uniform mixing and distribution of particles in the bed increases and segregation of particles decreases. study of pressure drop in the fluidized bed shows that in free slip conditions, the pressure drop is 8.09% and 14.2% less than partial slip and no-slip, respectively. Also, three types of rice husks with different restitution coefficients have been studied. As a result of this study, with decreasing the restitution coefficient between particles, the velocity of rice husk and sand particles increases by about 9% and the pressure drop decreases by about 22%.

کلیدواژه‌ها [English]

  • Bubbling Fluidized Bed
  • the Eulerian Approach
  • Hydrodynamic
  • Biomass
  • Mixing Bed Material and Biomass
  • Restitution Coefficient
  • Specularity Coefficient
  • Wall Boundary Condition for solid Phase

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