بررسی تأثیر فرکانس پالسی در بستر سیلان جامد-گاز به‌عنوان مخزن ذخیره‌سازی انرژی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران

2 گروه مکانیک، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران/ دانشکده مکانیک، دانشگاه صنعتی جندی شاپور، دزفول، ایران

3 گروه مکانیک، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران/دانشکده مکانیک، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این پژوهش، اندازه‌گیری‌های دما در یک بستر سیال حبابی پالسی جامد-گاز با ذرات ماسه سیلیسی 184 میکرومتری و هوای ورودی C° 60 به‌صورت تجربی انجام پذیرفت تا اثرات پالس جریان بر انتقال انرژی و راندمان ذخیره‌سازی آن در بستر، بررسی گردد. یک شیر برقی برای تغذیه هوای پالسی به بستر برای تغییر فرکانس نصب گردید و تأثیر فرکانس متناوب نیز بر هوای ورودی با اعمال وضعیت روشن خاموش شیر برقی بررسی شد. نتایج برای محدوده فرکانس Hz 1 تا Hz 10، نشان داد که سطح بستر با اعمال فرکانس نوسانی شده و دامنه نوسان با افزایش فرکانس، کاهش می‌یابد. افزایش فرکانس، ضریب انتقال حرارت را در مقایسه با جریان پیوسته توسعه می‌دهد و این توسعه متناسب با سرعت ظاهری گاز، باعث افزایش راندمان ذخیره‌سازی انرژی می‌شود. در سه نسبت سرعت 5/1، 2 و 5/2 به‌سرعت می‌نیمم سیالیت (Umf)، اثر پالس بر انتقال انرژی و ذخیره‌سازی بررسی شد و ماکزیمم کارآیی در فرکانس Hz 7 و نسبت سرعت 5/2 با افزایش 28% نسبت به‌حالت بدون پالس، مشاهده شد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the Effect of Pulse Frequency in Solid-Gas Fluidized Bed as an Energy Storage Tank

نویسندگان [English]

  • mahmood keshavarz 1
  • mohammadreza assari 2
  • Hassan Basirat Tabrizi 3
1 Mechanical Engineering Department, Dezful Branch, Islamic Azad University, Dezful, Iran
2 Mechanical Engineering Department, Dezful Branch, Islamic Azad University, Dezful, Iran\Mechanical Engineering Department, Jundi-Shapur University of Technology, Dezful, Iran
3 Mechanical Engineering Department, Dezful Branch, Islamic Azad University, Dezful, Iran\Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

In this research, temperature measurements were performed experimentally in a solid-gas bubble bed with 184 μm silica sand particles and an inlet air of 60 °C to determine the effect of flow pulse on the energy transfer and storage efficiency. A solenoid valve was installed to supply pulsed air to the substrate and the effect of the alternating frequency cycle on the incoming air was investigated by applying the on-off condition. Results for frequency ranges from 1 Hz to 10 Hz indicated the surface of the bed fluctuates with the pulse frequency, and the amplitude of the oscillation decreases with an increase in frequency. Higher frequency improves heat transfer coefficient compared to continuous state. This, along with increasing the apparent velocity of the carrier gas, increases the energy storage efficiency.  At three speed ratios with respect to the minimum fluidization velocity (Umf) of 1.5, 2 and 2.5, a maximum efficiency of 28% was observed at 7 Hz frequency and speed ratio of 2.5.
 

کلیدواژه‌ها [English]

  • Pulse Fluidized Bed
  • Gas-Solid Flow
  • Energy Storage
  • Efficiency
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