Particle collision behavior and heat transfer performance in a gas-solid circulating fluidized bed heat exchanger with threaded tube

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Abstract Fluidized bed heat transfer and anti-fouling technology is applied to threaded tube heat exchanger. A heat exchange device of internal threaded circulating fluidized bed is designed and built to investigate the particle collision behavior and heat transfer performance under different operating parameters, such as air flow rate (12—20 m³·h^-1), heat flux (1—3 kW·m^-2), and particle type. Air and four types of particles are selected as working media. The results show that the heat transfer of threaded pipes can be enhanced by adding inert solid particles, but the system pressure drop is also increased. The maximum heat transfer enhancing factor can reach 27.2% with the addition of POM particles at V=16 m³·h^-1 and q=2 kW·m^-2, and the maximum pressure drop ratio is no more than 38.5% within the experimental range. The characteristic frequency ranges of gas-phase and solid-phase collisions are 0—1 000 Hz and 5 000—2 5000 Hz, respectively. Particle collision plays a dominant role in the gas-solid two-phase flow collisions. As air flow rate increases, the signal power increases but the heat transfer enhancing factor first increases and then decreases. As heat flux increases, the heat transfer enhancing factor generally decreases. The effect of heat flux on signal power is relatively smaller compared with air flow rate. The heat transfer enhancing factor and signal power of GB particles are smaller than those of POM particles, and basically increase with the increase in GB particle size. With the increase in air flow rate or heat flux, the pressure drop ratio mainly shows an increasing trend, and decreases with the increase in GB particle size. The pressure drop ratio of POM particles is greater than that of GB3 particles.

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	Articles by authors
	JIANG Feng
	ZHU Lingyun
	LEDUO Elizabeth Nawa
	MOKHAMMAD Faridl Robitoh
	LI Xiulun

Keywords： particle collision behavior heat transfer enhancement gas-solid circulating fluidized bed heat exchanger threaded tube pressure drop

Received 2024-04-15;

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JIANG Feng, ZHU Lingyun, LEDUO Elizabeth Nawa, MOKHAMMAD Faridl Robitoh, LI Xiulun.Particle collision behavior and heat transfer performance in a gas-solid circulating fluidized bed heat exchanger with threaded tube[J] Chemcial Industry and Engineering, 2024,V41(6): 158-168

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