Wall-to-Bed Heat Transfer in Bubbling Fluidized Bed Reactors with an Immersed Heat Exchanger and Continuous Particle Exchange

Christoph Eder,Tobias Pröll,Gerhard Hofer

doi:10.1021/acs.iecr.0c06331

Abstract

Measurements were carried out to investigate the wall-to-bed heat transfer in a cross-flow bubbling fluidized bed under continuous solids exchange. The experiments were performed with different tub...

Highlights

Increasing anthropogenic greenhouse gases and the associated global warming are among the great challenges that humanity is facing in the 21st century
Wall-to-bed heat transfer coefficients were measured in a cross-flow bubbling fluidized bed cold flow model with continuous solids exchange
The gas flow, solids circulation rate, and tube bundle geometry were varied during the experiments to observe the influence of the forced crossflow on the heat transfer

Summary

Introduction

Increasing anthropogenic greenhouse gases and the associated global warming are among the great challenges that humanity is facing in the 21st century. Postcombustion technology is suitable for existing systems to separate carbon dioxide from point source flue gases, frequently realized via absorption using aqueous amine scrubbing solvents.[2] these solvents inherit due to their high heat capacity a high process heat requirement, especially for regeneration. Evaporation and degradation effects lead to high operating costs Because of these facts, the adsorption process using solid sorbents is receiving increasing attention as an alternative to the currently used, high-energy-demanding aqueous amine scrubbing technologies.[3] a continuous temperature swing adsorption process[4,5] for CO2 separation was considered and seems to be a promising alternative to the current scrubbing technologies. The smooth, liquidlike solids flow and the possibility for a continuous, automatically controlled operation enable the use of fluidized bed reactors in numerous physical and chemical processes such as combustion and gasification,[7,8] heat recovery,[9−11] coating,[12,13] drying,[14,15] or even temperature swing adsorption.[4,5,16,17] Extensive studies on gas−solid fluidized bed reactors have been and are being carried out to gain knowledge

Methods

Results

Conclusion