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

Document Type : Research Paper

Authors

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

Abstract

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.
 

Keywords

References

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Journal of Petroleum Research
Volume 31, Issue 119 - Serial Number 119
November and December 2021
Pages 60-74

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