Measurement of bed-to-tube surface heat transfer coefficient to a vertically immersed u-tube in bubbling loop seal of a CFB boiler

Stenberg, Viktor; Lind, Fredrik; Rydén, Magnus

doi:10.1016/j.powtec.2020.11.046

Cited by 7 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a fluidized bed heat exchanger, tubes are immersed in the dense zone of a fluidized bed and heat transfer will occur between the bed particles and the tube wall . Significant research has been conducted to study the phenomena experimentally, as well as present predictive expressions for the bed-to-tube heat transfer rate in different fluidization regimes. − …”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Random Packings on Heat Transfer and Particle Segregation in Packed-Fluidized Bed

Nemati

Andersson

Stenberg

et al. 2021

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The heat transfer coefficient, pressure drop, and vertical segregation in a bubbling fluidized bed reactor containing random packings were investigated. The bed material was silica sand in the size range of 90−400 μm. Experiments were done for bed temperatures ranging from 400 to 900 °C and superficial gas velocities up to 0.411 m/s. Five different types of packings were evaluated: (i) RMSR (25 mm stainless steel thread saddle ring), (ii) Hiflow (25 mm stainless steel pall ring), (iii) RR6 (6 mm ceramic Raschig ring), (iv) RR10 (10 mm ceramic Raschig ring), and (v) ASB (12.7 mm aluminum silicate balls). The RMSR packing showed an increase in the heat transfer coefficient (up to 1243 W/m 2 K), as compared to bubbling beds with no packings (up to 1124 W/m 2 K). Also, beds with RMSR and Hiflow packings had a lower pressure drop and vertical segregation compared to low void factor packings such as RR6, RR10, and ASB.

show abstract